nandang mufti - Academia.edu (original) (raw)
Papers by nandang mufti
Journal of Materials Research and Technology
INTERNATIONAL CONFERENCE ON LIFE SCIENCES AND TECHNOLOGY (ICoLiST 2020), 2021
Proceedings of the Proceedings of the 7th Mathematics, Science, and Computer Science Education International Seminar, MSCEIS 2019, 12 October 2019, Bandung, West Java, Indonesia, 2020
Phenol is an aromatic derivative of hydrocarbons from coal which used as a base for making plasti... more Phenol is an aromatic derivative of hydrocarbons from coal which used as a base for making plastic bottles, cans of packaged food, and pesticides. However, this compound is emerging as a pollutant in the environment. This work, the carbon paste electrode based on Ag nanoparticle was developed for the detection of phenol. Carbon paste electrode modified Ag nanoparticles which were previously synthesized first and then mixed with graphite and paraffin. The best composition of CPE-nAg is 5:70:25 for Ag nanoparticles, graphite, and paraffin, respectively. After measurement using CPE-nAg, it is necessary to remove phenol on the electrode surface with 6 cycles. Measurement was carried out using square wave voltammetry techniques range with 0 V to 1.2 V, a frequency of 10 Hz, and a scan rate of 75 mV/s. The result showed the presence of an oxidation peak of phenol is 0.475 V in 1 M of sodium hydroxide solution.
Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan, 2019
This research was aimed to explain the effect learning model and gender on the critical thinking ... more This research was aimed to explain the effect learning model and gender on the critical thinking capabilities in static fluid topic. The research design was used descriptive and quasi-experimental. The learning models was used discovery learning and schoologyassisted discovery learning. The research data was obtained from the posttest of critical thinking capabilities on senior high school students. The results of this study indicate a difference in critical thinking capabilities based on the learning model. Gender factors and interaction of learning models with gender do not give a difference to critical thinking capabilities. The result of this study indicates that only learning models which effect to critical thinking capabilities in static fluid topic. Abstrak: Penelitian ini bertujuan untuk menjelaskan pengaruh model pembelajaran dan jenis kelamin terhadap kemampuan berpikir kritis pada fluida statis. Desain penelitian yang digunakan adalah deskriptif dan eksperimen semu. Model pembelajaran yang digunakan adalah model pembelajaran discovery learning dan discovery learning berbantuan schoology. Data penelitian diperoleh dari posttest kemampuan berpikir kritis siswa SMA. Hasil dari penelitian ini menunjukkan adanya perbedaan pada kemampuan berpikir kritis berdasarkan model pembelajaran. Faktor jenis kelamin dan interaksi model pembelajaran dengan jenis kelamin tidak memberikan perbedaan terhadap kemampuan berpikir kritis. Hasil penelitian mengindikasikan bahwa hanya model pembelajaran yang berpengaruh terhadap kemampuan berpikir kritis pada fluida statis.
ChemistrySelect, 2020
One – layered Ruddlesden‐Popper phase Sr1+2xLa1‐2xFe1‐xNbxO4 doped with niobium was synthesized u... more One – layered Ruddlesden‐Popper phase Sr1+2xLa1‐2xFe1‐xNbxO4 doped with niobium was synthesized using a sol‐gel method for various Nb concentrations (x=0, 0.1, 0.3, and 0.5). Single‐phase samples could be observed with x=0 and 0.1, while x=0.3 and 0.5 contain additional phases. Microstructure results showed that the increase of niobium content corresponded to a decrease in the grain size of the samples. The magnetic measurements indicated that antiferromagnetic interactions of doped samples had decreased. The dielectric constant of the samples decreased as x increased due to the increase in conductivity. The origin of conduction in the samples might be caused by hopping conduction due to the mixed oxidation states of iron with charge +3 and +4.
AIP Conference Proceedings, 2020
Fe2.15Zn0.85O4-PEG/Carboxymethyl Cellulose/Polyvinyl Alcohol (Fe2.15Zn0.85O4-PEG/CMC/PVA) ferroge... more Fe2.15Zn0.85O4-PEG/Carboxymethyl Cellulose/Polyvinyl Alcohol (Fe2.15Zn0.85O4-PEG/CMC/PVA) ferrogel has been fabricated via the freezing-thawing route. Meanwhile, the Fe2.15Zn0.85O4-PEG nanoparticle filler was synthesized by using the coprecipitation method. Investigations of the Fe2.15Zn0.85O4-PEG/CMC/PVA ferrogel were carried out by using Transmission Electron Microscopy (TEM) instruments, Small Angle X-ray Scattering (SAXS), and Ultraviolet-Visible (UV-Vis) spectrometers to analyze the morphology of the magnetic filler, the nanostructural characteristic of the Fe2.15Zn0.85O4-PEG distribution in the Fe2.15Zn0.85O4-PEG/CMC/PVA ferrogel, and determine the optical properties of the sample through the obtained bandgap values, respectively. The distribution data of the Fe2.15Zn0.85O4-PEG magnetic nanoparticles was confirmed well by its morphological observation by using TEM instruments, which showed an average diameter value of around 10 nm. Thus, the Fe2.15Zn0.85O4-PEG nanoparticles were quite effectively and evenly distributed in the CMC/PVA hydrogel. Based on SAXS data analysis, the Fe2.15Zn0.85O4-PEG filler in the Fe2.15Zn0.85O4-PEG/CMC/PVA ferrogel had an average value of primary and secondary particles of ~ 3 and ~ 9 nm, respectively. Through UV-Vis analysis, the refractive index of the Fe2.15Zn0.85O4-PEG nanoparticles was around 1.9. This result has a good agreement with the previous report, which was in the range of 1.5 to 2.1. Furthermore, the increase in the bandgap of the Fe2.15Zn0.85O4-PEG nanoparticles was accompanied by an increase in the optical and electrical conductivity of the sample.
PROCEEDINGS OF THE 3RD INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2019): Exploring New Innovation in Metallurgy and Materials, 2020
Solar cell-based Copper Indium Gallium Selenide (CIGS) is one type of solar cell that has high ef... more Solar cell-based Copper Indium Gallium Selenide (CIGS) is one type of solar cell that has high efficiency. However, the most commonly used vapor deposition technique to deposit CIGS is a technique that requires high environmental control and cost. The research aims to produce thin-film CIGS with hot injection methods. Variations of the Decantation 4, 6 and 8 times were performed to acquire the pure CIGS nanoparticles carried out to study their influence on phases, crystal structures, morphologies, and optical properties at the same time to the methods of deposition of the Doctor Blade. CIGS Film is defied over the ITO substrate with the Doctor blade technique. The XRD diffraction pattern shows the structure of tetragonal crystals. CIGS grain size increases with the number of oleylamine solvent decantation processes. SEM results indicate that CIGS can be deposited evenly throughout the substrate surface. CIGS with decantation process as much as 8 times easiest to be deposited with the best properties to be applied as easy and cheap CIGS solar cell.
CONFERENCE ON THEORETICAL PHYSICS AND NONLINEAR PHENOMENA (CTPNP) 2019: Excursion from Vacuum to Condensed Matter, 2020
Synthesis of Fe3O4@ZnO core-shell nanoparticles has been successfully carried out by using the co... more Synthesis of Fe3O4@ZnO core-shell nanoparticles has been successfully carried out by using the coprecipitation method based on natural iron sand. Meanwhile, the Poly-Diallyl Dimethyl Ammonium Chloride (DADMAC) polymer was successfully compiled into the Fe3O4@ZnO core-shell nanoparticles, which were useful for accelerating precipitation and increasing performance in photodegradation. The samples were characterized by using X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Fourier-Transform Infrared (FTIR), Vibrating Sample Magnetometer (VSM), and Ultraviolet-Visible (UV-Vis) spectrophotometer. TEM characterization informed that the morphology of the Fe3O4@ZnO nanoparticles formed a core-shell structure. This case was evidenced from the results of the XRD analysis, which showed X-ray diffraction patterns with Fe3O4 and ZnO phases without other phases. Furthermore, analysis of VSM data showed the results of the coercivity field (Hc), saturation magnetization (Ms), and remanent magnetization (Mr), which tended to be smaller as the molarity of zinc acetate dihydrate increased. Furthermore, the FTIR results showed that the functional groups produced represented the presence of Poly-DADMAC polymers. However, the results of UV-Vis spectrophotometer analysis showed that the increase in the composition of Poly-DADMAC polymers composited with the Fe3O4@ZnO coreshell nanoparticles could increase the degradation potency in methylene orange solution from 38.61% to 51.84%. The Poly-DADMAC polymer could improve the potential of photodegradation in removing water pollution contamination.
IOP Conference Series: Materials Science and Engineering, 2019
The vibration of the motor provides information for failure diagnostic and prediction through sig... more The vibration of the motor provides information for failure diagnostic and prediction through signal processing. In this paper, we present an IoT-based monitoring system for recording the vibration of the induction motor. A 27mm piezoelectric is used to collect the vibration data from the motor. Each self-powered IoT node is supplied by the motor vibration its self by utilizing two 27mm piezoelectrics in series. We conducted an experiment with 3 scenarios, which aims to collect the vibration data from different positions, they are bottom, top and at the coupling. For each scenario, the speed of the induction motor is changed from low, middle to high speed. Based on our results, the proposed system is a success to monitor the motor vibration clearly. The results can display on the smartphone. Each node can send the recorded vibration to the cloud with an average delay of about 1 s.
IOP Conference Series: Earth and Environmental Science, 2019
Paddy soils are a typical anthropogenic soil resource that has a wet-dry cycle and plays an impor... more Paddy soils are a typical anthropogenic soil resource that has a wet-dry cycle and plays an important role almost all over the world, mainly in Indonesia. Along with the development of the current area of rice farming, the changes of many environmental from natural areas has undergone to settlements area and influenced by human activities. This study examines the magnetic properties and element content in special soils of paddy farming areas in the city of Malang. In this study magnetic susceptibility measurement was conducted on 60 samples taken from 3 locations, using Bartington susceptibilitymeter MS2B. The element determination was conducting by XRF (X-Ray fluorescence) on 3 representative samples. The result showed that the average of magnetic susceptibility low frequency (χlf) of paddy soils was 3.66 ×10−6 m3kg−1. The chemical elements in paddy soils are dominated by Fe, that is around 41.2 % then followed by Si about 36.7%, Al about 12%, Ca about 10.5% and Ti is the lowest va...
Journal of Inorganic and Organometallic Polymers and Materials, 2018
The magnetic hydrogels combining polyvinyl-alcohol (PVA) and Fe 3 O 4 (magnetite)-TMAH (tetra-met... more The magnetic hydrogels combining polyvinyl-alcohol (PVA) and Fe 3 O 4 (magnetite)-TMAH (tetra-methyl ammonium hydroxide) have been successfully fabricated via a Freezing-thawing route. The magnetite nanoparticles were prepared from iron sands by using coprecipitation method. The transmission electron microscopy image revealed that the magnetite nanoparticles with a reaction temperature of 30 °C had the average particle size of 12 nm in clusters of aggregation. The result was similar to the particle size obtained from X-ray diffraction data analyzed by Scherer equation. Furthermore, synchrotron small angle X-ray scattering data were analyzed by using two lognormal distributions to calculate the distribution of the individual magnetite particles. Meanwhile, Teubner-Strey and Beaucage models were employed to observe the distribution of magnetite particles coated by TMAH as a surfactant. The data analysis showed that the magnetite particles within the magnetic hydrogels formed aggregations with diameters of cluster particles in the range from 13.1 to 31.8 nm. Interestingly, the diameter of clusters particle increased from 13.1 to 31.8 nm along with the increasing concentration of ferrofluids from 1 to 15 wt%. This phenomenon was predicted to result from the effect of TMAH as a surface reactant agent that prevented the aggregation by coating the surface of the magnetite nanoparticles.
Jurnal Neutrino, 2018
Research to utilize natural polymers continues to be driven primarily by utilization as an enviro... more Research to utilize natural polymers continues to be driven primarily by utilization as an environmental friendly energy-generating and storage material. The high porosity makes cellulose acetate (CA) a good candidate as a dielectric material as the basis of the supercapacitor device. Various dopants and compositions have been widely used, but the nano size morphological differences of the same material are rarely reported. Two types of ZnO are prepared, i.e., nanoparticles and nanorods deposited with CA and deposited on ITO glass substrate. The CA-ZnO / ITO composite film was fabricated through spin coating technique. This study focused on ZnO morphological difference on the microstructure and the dielectricity of CA-ZnO /ITO composite films. The morphology of nanoparticles and nanorods of ZnO were analyzed more detail with respect to its microstructure and dielectric properties. It is revealed that the change of ZnO morphology from nanoparticles to nanorod increase the capacitance...
IOP Conference Series: Materials Science and Engineering, 2019
IOP Conference Series: Materials Science and Engineering, 2019
The search for finding effective ways to produce high quality of nanostructured materials have al... more The search for finding effective ways to produce high quality of nanostructured materials have always been the never-ending work of many scientists and engineers from time to time. Important issues to address are reducing fabrication expense and lowering energy utilization to complete the synthesis. A specific circumstance is an investigation of using relatively low temperature to fabricate pure silicon carbide (SiC), one of the most notable materials due to its excellent properties, from naturally appearing minerals. In this current study, silicon carbide was prepared by means of magnesiothermic approach at some adjusting temperatures using argon gas furnace. The source of silicon and carbon were respectively initiated from naturally purified silica and sucrose. The X-ray diffraction (XRD) assessment clearly uncovered the pure moissanite-3c phase of silicon carbide, having a cubic crystal structure. The disappearing of magnesium, otherwise in the form of magnesium oxide, was also validated by the X-ray fluorescence (XRF) test. Furthermore, the chemical functional groups were clarified by Fourier-transform infrared (FTIR) spectroscopy, and the silicon-carbide interaction was evidently detected from the FTIR spectrum. Besides, the SiC products exhibited high Vickers hardness values, nearly 150 MPa for the sample with temperature synthesis of 800 °C.
![Research paper thumbnail of Synthesis, Investigation on Structural and Magnetic Behaviors of Spinel M-Ferrite [M = Fe; Zn; Mn] Nanoparticles from Iron Sand](https://attachments.academia-assets.com/106988841/thumbnails/1.jpg)
](IOP Conference Series: Materials Science and Engineering, 2017
Spinel M-ferrite [M = Fe; Zn; Mn] nanoparticles were prepared from iron sand using a coprecipitat... more Spinel M-ferrite [M = Fe; Zn; Mn] nanoparticles were prepared from iron sand using a coprecipitation-sonochemical approach. The purified Fe 3 O 4 from iron sand, ZnCl 2 and MnCl 2 .4H 2 O, HCl, and NH 4 OH were used as raw materials. X-Ray Diffractometer (XRD), Fourier Transform Infra-Red (FTIR) spectroscopy, Transmission Electron Microscopy (TEM), and Vibration Sample Magnetometer (VSM) were employed to characterize the crystal structure, functional groups, particle size, morphology, and magnetic behavior of the prepared samples, respectively. From the XRD data analysis, M-ferrite particles exhibited a single phase in spinel structure. Furthermore, the M-ferrite particle increased their lattice parameter and crystal volume tracking the metallic-ionic radii of M. The particle size of the M-ferrites particles varied with M, whereas the biggest and lowest were for Zn and Mn, respectively. Based on the magnetization curve, the M-ferrite nanoparticles tended to perform a superparamagnetic behavior and their saturation magnetization as a function of their M ion and particle size.
IOP Conference Series: Materials Science and Engineering, 2017
ZnO nanorods were successfully synthesized via two stages, that is deposition of ZnO seed layers ... more ZnO nanorods were successfully synthesized via two stages, that is deposition of ZnO seed layers on ITO substrate and growth of ZnO nanorods via solvothermal method. A characterization by using XRD was employed to investigate the structure and size of the crystals. SEM characterization was used to study the size and morphology of the particles. UV-Vis and FTIR characterizations were used to investigate the bandgap and functional group of the samples. The data analysis presented that the ZnO particles had a crystal structure of hexagonal with rod morphology. The diameter size of the ZnO nanorods growth on the substrate surface for the growth time of 4, 6, and 8 hours were respectively 138, 230, and 236 nm with the length of the rods of 570, 934, and 1280 nm, respectively. The bandgaps of the ZnO nanorods for growth times of 4, 6, and 8 hours were respectively 3.14, 3.12, and 3.05 eV, while the ZnO seed layers had 3.22 eV band gap. FTIR spectrum showed that the main peaks were 400-515, 870, and 1250 cm-1 showing the functional groups of ZnO and H-C-N.
International Journal of Environmental Studies, 2015
Magnetic Fe3O4 nano-particles were prepared successfully from commonplace sands as a raw material... more Magnetic Fe3O4 nano-particles were prepared successfully from commonplace sands as a raw material. The nano-particles were synthesized by chemical co-precipitation of high purity iron separated from commonplace sands through acidic leaching. The characterization of the synthesized nano-particles was performed using X-ray diffraction, fourier transform infrared, scanning electron microscopy, transmission electron microscopy, and potential zeta. Finally, the nano-particles were used for adsorption of humic acid (HA) from aqueous solutions using batch adsorption technique. The effects of pH, adsorbent dosage, agitation time, initial HA concentration, and temperatures on HA adsorption were evaluated. The adsorption of HA onto nano-particles followed the Sips isotherm and pseudo-second order kinetics models. Thermodynamic parameters data indicated that the HA adsorption process was non-spontaneous and endothermic under the experimental conditions. The adsorption of HA from peat water (the real sample) using the nano-particles demonstrated that they were an adsorbent with great potential for the removal of HA from peat water.
Physical Review B, 2015
A Raman spectroscopy study on the half-doped single-layer manganite Pr 0.5 Ca 1.5 MnO 4 has been ... more A Raman spectroscopy study on the half-doped single-layer manganite Pr 0.5 Ca 1.5 MnO 4 has been performed in combination with x-ray diffraction, resistivity, magnetization, and specific heat measurements. The results provide insight into the underlying mechanisms of phenomena that arise from correlations between lattice, charge, orbital, and spin degrees of freedom. The appearance of a new Raman mode at 366 cm −1 , a visible jump in the resistivity, and a doubling of the unit cell signify the onset of charge/orbital ordering at 320 K. This transition is also marked by a sharp peak in the magnetic susceptibility and specific heat, suggesting strong spin-charge coupling. Our structural analysis suggests that the charge disproportionation below 320 K is small. Orbital fluctuations below 320 K are evidenced by the evolution with temperature of the Jahn-Teller Raman mode (situated at 533 cm −1 at 320 K). A coincidence between the onset of two-dimensional short-range antiferromagnetic order at 215 K and anomalies in both the temperature dependence of the Jahn-Teller mode and the Mn-O bonding pattern in the ab plane indicate that the short-range magnetic order plays a role in stabilizing the orbital fluctuations. Below the Néel temperature of 127 K, the softening of both the 366 cm −1 mode and an octahedral tilting mode at 214 cm −1 mark the onset of three-dimensional antiferromagnetic ordering. The estimated spin-phonon coupling constants for these two modes are 2.6 and 6.8 cm −1 , respectively. This study highlights the remarkable coupling of charge, orbital, and spin degrees of freedom to the lattice in single-layer Pr 0.5 Ca 1.5 MnO 4 .
Journal of Alloys and Compounds, 2015
Advanced Materials Research, 2014
Based on our previous work of MSA influence on silver nano particles formation we have performed ... more Based on our previous work of MSA influence on silver nano particles formation we have performed a series of research related to the preparation and characterization of silver nanoparticles which synthesized through coprecipitation process. The silver nano particles was transformed into silver nanoparticles films by spin coating deposition method. The silver nanoparticles were prepared from silver acetate as precursor, reductant agent phenylhydrazine, and dodecylamine as stabilizer. X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Analysis (EDAX), and Electric Four Point Probe have been used to characterize the silver nanoparticles as well as the films. The morphology and the crystal structure have been determined by means of XRD and SEM. The average grain size of silver nanoparticles is found to be 22 nm. The peaks in XRD pattern are in good agreement with that of face-centered-cubic phase of metallic silver. The electri...
Journal of Materials Research and Technology
INTERNATIONAL CONFERENCE ON LIFE SCIENCES AND TECHNOLOGY (ICoLiST 2020), 2021
Proceedings of the Proceedings of the 7th Mathematics, Science, and Computer Science Education International Seminar, MSCEIS 2019, 12 October 2019, Bandung, West Java, Indonesia, 2020
Phenol is an aromatic derivative of hydrocarbons from coal which used as a base for making plasti... more Phenol is an aromatic derivative of hydrocarbons from coal which used as a base for making plastic bottles, cans of packaged food, and pesticides. However, this compound is emerging as a pollutant in the environment. This work, the carbon paste electrode based on Ag nanoparticle was developed for the detection of phenol. Carbon paste electrode modified Ag nanoparticles which were previously synthesized first and then mixed with graphite and paraffin. The best composition of CPE-nAg is 5:70:25 for Ag nanoparticles, graphite, and paraffin, respectively. After measurement using CPE-nAg, it is necessary to remove phenol on the electrode surface with 6 cycles. Measurement was carried out using square wave voltammetry techniques range with 0 V to 1.2 V, a frequency of 10 Hz, and a scan rate of 75 mV/s. The result showed the presence of an oxidation peak of phenol is 0.475 V in 1 M of sodium hydroxide solution.
Jurnal Pendidikan: Teori, Penelitian, dan Pengembangan, 2019
This research was aimed to explain the effect learning model and gender on the critical thinking ... more This research was aimed to explain the effect learning model and gender on the critical thinking capabilities in static fluid topic. The research design was used descriptive and quasi-experimental. The learning models was used discovery learning and schoologyassisted discovery learning. The research data was obtained from the posttest of critical thinking capabilities on senior high school students. The results of this study indicate a difference in critical thinking capabilities based on the learning model. Gender factors and interaction of learning models with gender do not give a difference to critical thinking capabilities. The result of this study indicates that only learning models which effect to critical thinking capabilities in static fluid topic. Abstrak: Penelitian ini bertujuan untuk menjelaskan pengaruh model pembelajaran dan jenis kelamin terhadap kemampuan berpikir kritis pada fluida statis. Desain penelitian yang digunakan adalah deskriptif dan eksperimen semu. Model pembelajaran yang digunakan adalah model pembelajaran discovery learning dan discovery learning berbantuan schoology. Data penelitian diperoleh dari posttest kemampuan berpikir kritis siswa SMA. Hasil dari penelitian ini menunjukkan adanya perbedaan pada kemampuan berpikir kritis berdasarkan model pembelajaran. Faktor jenis kelamin dan interaksi model pembelajaran dengan jenis kelamin tidak memberikan perbedaan terhadap kemampuan berpikir kritis. Hasil penelitian mengindikasikan bahwa hanya model pembelajaran yang berpengaruh terhadap kemampuan berpikir kritis pada fluida statis.
ChemistrySelect, 2020
One – layered Ruddlesden‐Popper phase Sr1+2xLa1‐2xFe1‐xNbxO4 doped with niobium was synthesized u... more One – layered Ruddlesden‐Popper phase Sr1+2xLa1‐2xFe1‐xNbxO4 doped with niobium was synthesized using a sol‐gel method for various Nb concentrations (x=0, 0.1, 0.3, and 0.5). Single‐phase samples could be observed with x=0 and 0.1, while x=0.3 and 0.5 contain additional phases. Microstructure results showed that the increase of niobium content corresponded to a decrease in the grain size of the samples. The magnetic measurements indicated that antiferromagnetic interactions of doped samples had decreased. The dielectric constant of the samples decreased as x increased due to the increase in conductivity. The origin of conduction in the samples might be caused by hopping conduction due to the mixed oxidation states of iron with charge +3 and +4.
AIP Conference Proceedings, 2020
Fe2.15Zn0.85O4-PEG/Carboxymethyl Cellulose/Polyvinyl Alcohol (Fe2.15Zn0.85O4-PEG/CMC/PVA) ferroge... more Fe2.15Zn0.85O4-PEG/Carboxymethyl Cellulose/Polyvinyl Alcohol (Fe2.15Zn0.85O4-PEG/CMC/PVA) ferrogel has been fabricated via the freezing-thawing route. Meanwhile, the Fe2.15Zn0.85O4-PEG nanoparticle filler was synthesized by using the coprecipitation method. Investigations of the Fe2.15Zn0.85O4-PEG/CMC/PVA ferrogel were carried out by using Transmission Electron Microscopy (TEM) instruments, Small Angle X-ray Scattering (SAXS), and Ultraviolet-Visible (UV-Vis) spectrometers to analyze the morphology of the magnetic filler, the nanostructural characteristic of the Fe2.15Zn0.85O4-PEG distribution in the Fe2.15Zn0.85O4-PEG/CMC/PVA ferrogel, and determine the optical properties of the sample through the obtained bandgap values, respectively. The distribution data of the Fe2.15Zn0.85O4-PEG magnetic nanoparticles was confirmed well by its morphological observation by using TEM instruments, which showed an average diameter value of around 10 nm. Thus, the Fe2.15Zn0.85O4-PEG nanoparticles were quite effectively and evenly distributed in the CMC/PVA hydrogel. Based on SAXS data analysis, the Fe2.15Zn0.85O4-PEG filler in the Fe2.15Zn0.85O4-PEG/CMC/PVA ferrogel had an average value of primary and secondary particles of ~ 3 and ~ 9 nm, respectively. Through UV-Vis analysis, the refractive index of the Fe2.15Zn0.85O4-PEG nanoparticles was around 1.9. This result has a good agreement with the previous report, which was in the range of 1.5 to 2.1. Furthermore, the increase in the bandgap of the Fe2.15Zn0.85O4-PEG nanoparticles was accompanied by an increase in the optical and electrical conductivity of the sample.
PROCEEDINGS OF THE 3RD INTERNATIONAL SEMINAR ON METALLURGY AND MATERIALS (ISMM2019): Exploring New Innovation in Metallurgy and Materials, 2020
Solar cell-based Copper Indium Gallium Selenide (CIGS) is one type of solar cell that has high ef... more Solar cell-based Copper Indium Gallium Selenide (CIGS) is one type of solar cell that has high efficiency. However, the most commonly used vapor deposition technique to deposit CIGS is a technique that requires high environmental control and cost. The research aims to produce thin-film CIGS with hot injection methods. Variations of the Decantation 4, 6 and 8 times were performed to acquire the pure CIGS nanoparticles carried out to study their influence on phases, crystal structures, morphologies, and optical properties at the same time to the methods of deposition of the Doctor Blade. CIGS Film is defied over the ITO substrate with the Doctor blade technique. The XRD diffraction pattern shows the structure of tetragonal crystals. CIGS grain size increases with the number of oleylamine solvent decantation processes. SEM results indicate that CIGS can be deposited evenly throughout the substrate surface. CIGS with decantation process as much as 8 times easiest to be deposited with the best properties to be applied as easy and cheap CIGS solar cell.
CONFERENCE ON THEORETICAL PHYSICS AND NONLINEAR PHENOMENA (CTPNP) 2019: Excursion from Vacuum to Condensed Matter, 2020
Synthesis of Fe3O4@ZnO core-shell nanoparticles has been successfully carried out by using the co... more Synthesis of Fe3O4@ZnO core-shell nanoparticles has been successfully carried out by using the coprecipitation method based on natural iron sand. Meanwhile, the Poly-Diallyl Dimethyl Ammonium Chloride (DADMAC) polymer was successfully compiled into the Fe3O4@ZnO core-shell nanoparticles, which were useful for accelerating precipitation and increasing performance in photodegradation. The samples were characterized by using X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Fourier-Transform Infrared (FTIR), Vibrating Sample Magnetometer (VSM), and Ultraviolet-Visible (UV-Vis) spectrophotometer. TEM characterization informed that the morphology of the Fe3O4@ZnO nanoparticles formed a core-shell structure. This case was evidenced from the results of the XRD analysis, which showed X-ray diffraction patterns with Fe3O4 and ZnO phases without other phases. Furthermore, analysis of VSM data showed the results of the coercivity field (Hc), saturation magnetization (Ms), and remanent magnetization (Mr), which tended to be smaller as the molarity of zinc acetate dihydrate increased. Furthermore, the FTIR results showed that the functional groups produced represented the presence of Poly-DADMAC polymers. However, the results of UV-Vis spectrophotometer analysis showed that the increase in the composition of Poly-DADMAC polymers composited with the Fe3O4@ZnO coreshell nanoparticles could increase the degradation potency in methylene orange solution from 38.61% to 51.84%. The Poly-DADMAC polymer could improve the potential of photodegradation in removing water pollution contamination.
IOP Conference Series: Materials Science and Engineering, 2019
The vibration of the motor provides information for failure diagnostic and prediction through sig... more The vibration of the motor provides information for failure diagnostic and prediction through signal processing. In this paper, we present an IoT-based monitoring system for recording the vibration of the induction motor. A 27mm piezoelectric is used to collect the vibration data from the motor. Each self-powered IoT node is supplied by the motor vibration its self by utilizing two 27mm piezoelectrics in series. We conducted an experiment with 3 scenarios, which aims to collect the vibration data from different positions, they are bottom, top and at the coupling. For each scenario, the speed of the induction motor is changed from low, middle to high speed. Based on our results, the proposed system is a success to monitor the motor vibration clearly. The results can display on the smartphone. Each node can send the recorded vibration to the cloud with an average delay of about 1 s.
IOP Conference Series: Earth and Environmental Science, 2019
Paddy soils are a typical anthropogenic soil resource that has a wet-dry cycle and plays an impor... more Paddy soils are a typical anthropogenic soil resource that has a wet-dry cycle and plays an important role almost all over the world, mainly in Indonesia. Along with the development of the current area of rice farming, the changes of many environmental from natural areas has undergone to settlements area and influenced by human activities. This study examines the magnetic properties and element content in special soils of paddy farming areas in the city of Malang. In this study magnetic susceptibility measurement was conducted on 60 samples taken from 3 locations, using Bartington susceptibilitymeter MS2B. The element determination was conducting by XRF (X-Ray fluorescence) on 3 representative samples. The result showed that the average of magnetic susceptibility low frequency (χlf) of paddy soils was 3.66 ×10−6 m3kg−1. The chemical elements in paddy soils are dominated by Fe, that is around 41.2 % then followed by Si about 36.7%, Al about 12%, Ca about 10.5% and Ti is the lowest va...
Journal of Inorganic and Organometallic Polymers and Materials, 2018
The magnetic hydrogels combining polyvinyl-alcohol (PVA) and Fe 3 O 4 (magnetite)-TMAH (tetra-met... more The magnetic hydrogels combining polyvinyl-alcohol (PVA) and Fe 3 O 4 (magnetite)-TMAH (tetra-methyl ammonium hydroxide) have been successfully fabricated via a Freezing-thawing route. The magnetite nanoparticles were prepared from iron sands by using coprecipitation method. The transmission electron microscopy image revealed that the magnetite nanoparticles with a reaction temperature of 30 °C had the average particle size of 12 nm in clusters of aggregation. The result was similar to the particle size obtained from X-ray diffraction data analyzed by Scherer equation. Furthermore, synchrotron small angle X-ray scattering data were analyzed by using two lognormal distributions to calculate the distribution of the individual magnetite particles. Meanwhile, Teubner-Strey and Beaucage models were employed to observe the distribution of magnetite particles coated by TMAH as a surfactant. The data analysis showed that the magnetite particles within the magnetic hydrogels formed aggregations with diameters of cluster particles in the range from 13.1 to 31.8 nm. Interestingly, the diameter of clusters particle increased from 13.1 to 31.8 nm along with the increasing concentration of ferrofluids from 1 to 15 wt%. This phenomenon was predicted to result from the effect of TMAH as a surface reactant agent that prevented the aggregation by coating the surface of the magnetite nanoparticles.
Jurnal Neutrino, 2018
Research to utilize natural polymers continues to be driven primarily by utilization as an enviro... more Research to utilize natural polymers continues to be driven primarily by utilization as an environmental friendly energy-generating and storage material. The high porosity makes cellulose acetate (CA) a good candidate as a dielectric material as the basis of the supercapacitor device. Various dopants and compositions have been widely used, but the nano size morphological differences of the same material are rarely reported. Two types of ZnO are prepared, i.e., nanoparticles and nanorods deposited with CA and deposited on ITO glass substrate. The CA-ZnO / ITO composite film was fabricated through spin coating technique. This study focused on ZnO morphological difference on the microstructure and the dielectricity of CA-ZnO /ITO composite films. The morphology of nanoparticles and nanorods of ZnO were analyzed more detail with respect to its microstructure and dielectric properties. It is revealed that the change of ZnO morphology from nanoparticles to nanorod increase the capacitance...
IOP Conference Series: Materials Science and Engineering, 2019
IOP Conference Series: Materials Science and Engineering, 2019
The search for finding effective ways to produce high quality of nanostructured materials have al... more The search for finding effective ways to produce high quality of nanostructured materials have always been the never-ending work of many scientists and engineers from time to time. Important issues to address are reducing fabrication expense and lowering energy utilization to complete the synthesis. A specific circumstance is an investigation of using relatively low temperature to fabricate pure silicon carbide (SiC), one of the most notable materials due to its excellent properties, from naturally appearing minerals. In this current study, silicon carbide was prepared by means of magnesiothermic approach at some adjusting temperatures using argon gas furnace. The source of silicon and carbon were respectively initiated from naturally purified silica and sucrose. The X-ray diffraction (XRD) assessment clearly uncovered the pure moissanite-3c phase of silicon carbide, having a cubic crystal structure. The disappearing of magnesium, otherwise in the form of magnesium oxide, was also validated by the X-ray fluorescence (XRF) test. Furthermore, the chemical functional groups were clarified by Fourier-transform infrared (FTIR) spectroscopy, and the silicon-carbide interaction was evidently detected from the FTIR spectrum. Besides, the SiC products exhibited high Vickers hardness values, nearly 150 MPa for the sample with temperature synthesis of 800 °C.
IOP Conference Series: Materials Science and Engineering, 2017
Spinel M-ferrite [M = Fe; Zn; Mn] nanoparticles were prepared from iron sand using a coprecipitat... more Spinel M-ferrite [M = Fe; Zn; Mn] nanoparticles were prepared from iron sand using a coprecipitation-sonochemical approach. The purified Fe 3 O 4 from iron sand, ZnCl 2 and MnCl 2 .4H 2 O, HCl, and NH 4 OH were used as raw materials. X-Ray Diffractometer (XRD), Fourier Transform Infra-Red (FTIR) spectroscopy, Transmission Electron Microscopy (TEM), and Vibration Sample Magnetometer (VSM) were employed to characterize the crystal structure, functional groups, particle size, morphology, and magnetic behavior of the prepared samples, respectively. From the XRD data analysis, M-ferrite particles exhibited a single phase in spinel structure. Furthermore, the M-ferrite particle increased their lattice parameter and crystal volume tracking the metallic-ionic radii of M. The particle size of the M-ferrites particles varied with M, whereas the biggest and lowest were for Zn and Mn, respectively. Based on the magnetization curve, the M-ferrite nanoparticles tended to perform a superparamagnetic behavior and their saturation magnetization as a function of their M ion and particle size.
IOP Conference Series: Materials Science and Engineering, 2017
ZnO nanorods were successfully synthesized via two stages, that is deposition of ZnO seed layers ... more ZnO nanorods were successfully synthesized via two stages, that is deposition of ZnO seed layers on ITO substrate and growth of ZnO nanorods via solvothermal method. A characterization by using XRD was employed to investigate the structure and size of the crystals. SEM characterization was used to study the size and morphology of the particles. UV-Vis and FTIR characterizations were used to investigate the bandgap and functional group of the samples. The data analysis presented that the ZnO particles had a crystal structure of hexagonal with rod morphology. The diameter size of the ZnO nanorods growth on the substrate surface for the growth time of 4, 6, and 8 hours were respectively 138, 230, and 236 nm with the length of the rods of 570, 934, and 1280 nm, respectively. The bandgaps of the ZnO nanorods for growth times of 4, 6, and 8 hours were respectively 3.14, 3.12, and 3.05 eV, while the ZnO seed layers had 3.22 eV band gap. FTIR spectrum showed that the main peaks were 400-515, 870, and 1250 cm-1 showing the functional groups of ZnO and H-C-N.
International Journal of Environmental Studies, 2015
Magnetic Fe3O4 nano-particles were prepared successfully from commonplace sands as a raw material... more Magnetic Fe3O4 nano-particles were prepared successfully from commonplace sands as a raw material. The nano-particles were synthesized by chemical co-precipitation of high purity iron separated from commonplace sands through acidic leaching. The characterization of the synthesized nano-particles was performed using X-ray diffraction, fourier transform infrared, scanning electron microscopy, transmission electron microscopy, and potential zeta. Finally, the nano-particles were used for adsorption of humic acid (HA) from aqueous solutions using batch adsorption technique. The effects of pH, adsorbent dosage, agitation time, initial HA concentration, and temperatures on HA adsorption were evaluated. The adsorption of HA onto nano-particles followed the Sips isotherm and pseudo-second order kinetics models. Thermodynamic parameters data indicated that the HA adsorption process was non-spontaneous and endothermic under the experimental conditions. The adsorption of HA from peat water (the real sample) using the nano-particles demonstrated that they were an adsorbent with great potential for the removal of HA from peat water.
Physical Review B, 2015
A Raman spectroscopy study on the half-doped single-layer manganite Pr 0.5 Ca 1.5 MnO 4 has been ... more A Raman spectroscopy study on the half-doped single-layer manganite Pr 0.5 Ca 1.5 MnO 4 has been performed in combination with x-ray diffraction, resistivity, magnetization, and specific heat measurements. The results provide insight into the underlying mechanisms of phenomena that arise from correlations between lattice, charge, orbital, and spin degrees of freedom. The appearance of a new Raman mode at 366 cm −1 , a visible jump in the resistivity, and a doubling of the unit cell signify the onset of charge/orbital ordering at 320 K. This transition is also marked by a sharp peak in the magnetic susceptibility and specific heat, suggesting strong spin-charge coupling. Our structural analysis suggests that the charge disproportionation below 320 K is small. Orbital fluctuations below 320 K are evidenced by the evolution with temperature of the Jahn-Teller Raman mode (situated at 533 cm −1 at 320 K). A coincidence between the onset of two-dimensional short-range antiferromagnetic order at 215 K and anomalies in both the temperature dependence of the Jahn-Teller mode and the Mn-O bonding pattern in the ab plane indicate that the short-range magnetic order plays a role in stabilizing the orbital fluctuations. Below the Néel temperature of 127 K, the softening of both the 366 cm −1 mode and an octahedral tilting mode at 214 cm −1 mark the onset of three-dimensional antiferromagnetic ordering. The estimated spin-phonon coupling constants for these two modes are 2.6 and 6.8 cm −1 , respectively. This study highlights the remarkable coupling of charge, orbital, and spin degrees of freedom to the lattice in single-layer Pr 0.5 Ca 1.5 MnO 4 .
Journal of Alloys and Compounds, 2015
Advanced Materials Research, 2014
Based on our previous work of MSA influence on silver nano particles formation we have performed ... more Based on our previous work of MSA influence on silver nano particles formation we have performed a series of research related to the preparation and characterization of silver nanoparticles which synthesized through coprecipitation process. The silver nano particles was transformed into silver nanoparticles films by spin coating deposition method. The silver nanoparticles were prepared from silver acetate as precursor, reductant agent phenylhydrazine, and dodecylamine as stabilizer. X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray Analysis (EDAX), and Electric Four Point Probe have been used to characterize the silver nanoparticles as well as the films. The morphology and the crystal structure have been determined by means of XRD and SEM. The average grain size of silver nanoparticles is found to be 22 nm. The peaks in XRD pattern are in good agreement with that of face-centered-cubic phase of metallic silver. The electri...