Dahlang Tahir - Academia.edu (original) (raw)

Papers by Dahlang Tahir

Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat, 2022

Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat, 2021

Technological processes for modification of materials, deposition, and prevented fumes in the pyr... more Technological processes for modification of materials, deposition, and prevented fumes in the pyrolysis processes are used gases materials in the medium with vacuum pressure or atmospheric air pressure. Therefore, it is essential to understand heat flow transport for designing an efficient reactor or find the substrate's excellent position in the reactor or furnace for growing materials. We evaluated the energy transfer phenomena in the form of temperature distribution and heat flow for various heating sources for the gases and solid materials by Gauss-Seidel equation. The thermal conductivity coefficient (k), number of heating sources, and position of heating sources show an essential parameter for transmitting the distribution of the heat. For high k value shows efficiently for heat transfer at low temperature due to the atom's position close each other. The heat also affects to the phonon and lattice vibration like a wave which successfully shows these phenomena in this st...

Measurement of Radon ( 222 Rn) radioactivity level at BATAN office Jakarta has been done. Radon i... more Measurement of Radon ( 222 Rn) radioactivity level at BATAN office Jakarta has been done. Radon is a radioactive emitting alpha particle, very dangerous to the health because if it is inhaled, will be accumulated in the lungs and cause lung cancer. The purpose of the research was to determine the activity concentration of 222 Rn in the workplace and to estimate the dose received by workers. The sampling method is purposive sampling, in several office rooms of the BATAN office (staff room, laboratory, and warehouse), measurement 222 Rn using RAD7 continuously for 24 hours. Based on the activity concentration of 222 Rn in the rooms, an estimate of the effective dose received by the workers while working indoors can be calculated. The results showed that exposure of 222 Rn gas radiation in the workplace was relatively varied, radiation exposure in warehouses was 18.90-32.90 (25.90) Bq.m -3 higher than in laboratory 8.20-34.00 (22.43) Bq.m -3 and staff room 5.40-29.60 (16.68) Bq.m -3 . ...

Karbon dots (C-dots) merupakan nanopartikel karbon dengan sifat berpendar dan dapat disintesis da... more Karbon dots (C-dots) merupakan nanopartikel karbon dengan sifat berpendar dan dapat disintesis dari berbagai sumber karbon.Tantangan sintesis C-Dots adalah memanfaatkan sumber daya alam sebagai bahan bakunya. Dalam penelitian ini, sintesis C-Dots dari daun mangga kering dan daun mangga segar telah berhasil dilakukan. C-Dots yang dihasilkan dari kedua bahan ini berbentuk koloid. Sintesis C-Dots dengan metode buttom up dengan cara radiasi microwave selama 30 menit. Sifat fisis warna C-Dots daun mangga kering menunjukkan warna cokelat gelap, sedangkan sifat fisis warna C-Dots daun mangga segar menunjukkan warna kuning terang. C-Dots daun mangga kering memiliki spektrum absorbansi cahaya pada panjang gelombang 290- 433 nm dengan intensitas tertinggi terukur pada panjang gelombang 382 nm. Sedangkan, untuk C-Dots daun mangga segar memiliki spektrum absorbansi cahaya pada panjang gelombang 290-385 nm dengan intensitas tertinggi terukur pada panjang gelombang 351 nm. Spektrum emisi C-Dots j...

Agriculture biomass has the potential to be used as feedstock for biomass production as energy re... more Agriculture biomass has the potential to be used as feedstock for biomass production as energy resources in the future. In this study, the physical properties of different kind of biomass based charcoals briquettes with the mixing ratios between the biomass charcoal and binding agents of 90:10, 80:20, and 70:30 was determined. Charcoal of groundnut shell, durian shell, and cassava peel were used to produce briquette biomass based charcoals. The binding agent was found to significantly affect to the physical properties. Moisture, ash, volatile matter and compressive strength increased with increasing the amount of binding agent. The briquettes which have similar properties with the SNI standard are briquette from groundnut shell for lowest (10%) amount of binding agent. The charcoal from groundnut shell had the highest silica content followed by durian shell and cassava peel. As the amount of silica is high, the carbon content and the calorific value also is high. Silica also can be ...

2021 3rd International Conference on High Voltage Engineering and Power Systems (ICHVEPS), 2021

The effect of economic and population growth rapidly contributes to the energy usage of buildings... more The effect of economic and population growth rapidly contributes to the energy usage of buildings increasing to high levels. To minimize the electrical energy consumption (EC), thermal insulation of wall has significant impact to minimizing the EC of building. The aim of this paper is to define the influence of wall on reducing EC of residential building with different wall characteristics. In this case, two different kinds of building characteristics were evaluated, namely: building-1 applied an innovative Cellular Lightweight Concrete (inCLC) brick and building-2 with wood applied to create the walls. Under numerical optimization, a mathematical model was developed to define the EC of air conditioning (AC). Based on the result of research indicated the EC of building-1 (IDR 25,365) was cheaper than building-2 (IDR 29,350). Consequently, the energy cost reduction (ECR) can be achieved to be IDR 3,985 (13.57%).

Luminescence, 2021

Carbon dots (CDs) are carbon nanoparticles with a size of less than 10 nm, and are synthesized fr... more Carbon dots (CDs) are carbon nanoparticles with a size of less than 10 nm, and are synthesized from various sources; they have been of great interest to scientists worldwide due to their unique optical, electrical, and chemical properties. Sources of carbon are inexpensive and can be classified as a renewable natural resources. Many researchers use CDs because of their low toxicity, better water solubility, high biocompatibility, and stable photoluminescence. The simple methods for producing CDs are hydrothermal and use inexpensive equipment, have low energy consumption, simple manipulation, and one‐step preparation. Since the discovery of CDs, researchers have used them in various applications such as sensing, bioimaging, drug delivery, and catalysis. In this review, CDs synthesized from natural resources such as samples from herbs, roots, leaves, flowers, and fruit and some applications are described. This review provides a summary of carbon dots that is expected to provide furthe...

Optical Materials, 2021

Abstract Structural, optical, and absorption properties of nano-composites iron powder/carbon nan... more Abstract Structural, optical, and absorption properties of nano-composites iron powder/carbon nano-sphere/polyvinyl alcohol (Fe/CNs/PVA) for electromagnetic (EM) wave absorber based on CNs from bamboo fiber studied by X-ray diffraction (XRD), Fourier transforms infra-red (FTIR), and vector network analyzer (VNA), respectively. The existence of the diffraction peaks identified by crystal orientation (hkl) (004), (224) and (115) with FWHM, strain, and working frequency increases with increasing the activation temperature indicated the formation of the new structures. These findings consistent with the distance (Δ(LO-TO)) between two optical phonon vibrations mode increases indicated that, the stable covalent bonding formation of Fe/CNs/PVA particles increase with increasing the temperature activation of CNs. Temperature activation of the CNs play an important role in expanding the frequency up to 5.56 GHz with reflection loss (RL) −23.16 dB, indicated that a new type absorber for attenuating 99% EM wave. This study shows that the FTIR spectra could be useful for determining the optical properties, phonon vibration, dielectric function, and energy loss function of composite Fe/CNs/PVA.

Journal of Physics: Conference Series, 2018

In this study, the image quality of CT scan using phantom American College of Radiology (ACR) was... more In this study, the image quality of CT scan using phantom American College of Radiology (ACR) was determined. Scanning multidetector CT is used to know the image quality parameters by using a solid phantom containing four modules and primarily from materials that are equivalent to water. Each module is 4 cm in diameter and 20 cm in diameter. There is white alignment marks painted white to reflect the alignment laser and there are also "HEAD", "FOOT", and "TOP" marks on the phantom to help align. This test obtains CT images of each module according to the routine inspection protocol of the head. Acceptance of image quality obtained for determination: CT Number Accuracy (CTN), CT Number Uniformity and Noise, Linearity CT Number, Slice Technique, Low Contrast Resolution and High Contrast Resolution represent image quality parameters. In testing CT Number Accuracy (CTN), CT Uniform number and Noise are in the range of tolerable values allowed. In the test, Linearity CT Number obtained correlation value above 0.99 is the relationship between electron density and CT Number. In a low contrast resolution test, the smallest contrast groups are visible. In contrast, the high resolution is seen up to 7 lp/cm. The quality of GE CT Scan is very high, as all the image quality tests obtained are within the tolerance brackets of values permitted by the Nuclear Power Control Agency (BAPETEN). Image quality test is a way to get very important information about the accuracy of snoring result by using phantom ACR.

Environmental Engineering Research, 2018

Journal of Inorganic and Organometallic Polymers and Materials, 2020

Ceramics International, 2020

Jurnal Elektronika dan Telekomunikasi, 2018

Monolithic design is one of the most promising dye-sensitized solar cell (DSSC) architectures to ... more Monolithic design is one of the most promising dye-sensitized solar cell (DSSC) architectures to develop, because it allows the elimination of one conductive substrate and offers the possibility for printing layer-by-layer of the materials that made up its structure. In this study, titanium dioxide-based monolithic type DSSCs were fabricated on a single fluorine-doped transparent oxide coated glass with TiO2 as photoanode and porous ZrO2 as spacer. The type of the carbon material used as the composite paste for the counter electrode was varied to see the effect on the solar cell efficiency. Four-point probes measurement revealed that the resistivity of the carbon layer synthesized using activated carbon exhibited slightly higher conductivity with a sheet resistance of 10.70 Ω/sq and 11.09 Ω/sq for activated carbon and carbon nanopowder, respectively. The efficiency of DSSC that uses activated carbon as counter electrode was higher (i.e. 0.221%) than the DSSC with carbon nanopowder (...

Journal of Dentomaxillofacial Science, 2018

Surface and Interface Analysis, 2019

Stopping power (SP) and inelastic mean free path (IMFP) of electrons in Ti, Fe, Ni, and Pd have b... more Stopping power (SP) and inelastic mean free path (IMFP) of electrons in Ti, Fe, Ni, and Pd have been determined by using dielectric models. We have used energy loss function (ELF) determined from quantitative analysis of experimental reflection electron energy loss spectroscopy (REELS) spectra as the input parameter for this model. ELF in this study was determined from the previously published quantitative analysis of REELS spectra. The SP of Fe, Ni, Pd, and Ti was compared with several calculation methods for energies from 100 eV to 10 keV and shows SP in this study, which are in best agreement for medium to high energies (greater than or equal to 300 eV). The IMFP obtained in this study shows the best agreement with online database TPP2M and NIST and also calculation by Tanuma with a root mean square (rms) less than 12%. The present approach shows ELF from quantitative analysis of REELS spectra has a high potential for the experimental determination of SP and IMFP of metals.

Journal of Physics: Conference Series, 2018

IOP Conference Series: Materials Science and Engineering, 2019

Structural, mechanical properties, and bonding characteristic of plastic bio-composites (starch/c... more Structural, mechanical properties, and bonding characteristic of plastic bio-composites (starch/chitosan) with an additional Pineapple leaf microfibers (PLM) for 3%, 6% and 9% were carried out by using X-Ray diffraction (XRD), tensile strength test, and Fourier transform infra-red (FTIR) spectroscopy, respectively. The value of tensile strength shows highest for plastic bi-composite with 9% PLM and also XRD spectra shows the amorphous phase with new structure was formed for all bio-composite + PLM. FTIR spectra shows the strong bonding formation as the effect of PLM indicated by increase the intensity of C-H and C=C bond with increasing the amount of PLM. From the biodegradation test shows the PLM strongly influenced to the degradation ability of bio-composite and the highest is for 9% PLM (>80% ). In addition, the lowest browning index is about 37.5% for bio-composite with additional 9% PLM which was determined by using fresh cherry (Muntingia calabura. L). It’s indicated that t...

Materials Science Forum, 2019

Purple sweet potato (Ipomoea batatas L) contains high anthocyanin and peonidin glycosides which a... more Purple sweet potato (Ipomoea batatas L) contains high anthocyanin and peonidin glycosides which are useful as powerful natural antioxidants. Microwaves is an electric oven that use for heats and cooks food by exposing electromagnetic radiation produce thermal energy which was influenced to the composition and structural properties of food. In this study, the effect of microwave irradiation on the structural and bonding characteristic of Ipomoea batatas L have been analysis by X-ray diffraction (XRD and Fourier transform infra-red (FTIR), respectively. The composition and the crystallite size was decreases with increasing the temperature and the time of irradiation. The intensity of functional group FTIR spectra shows for 20 minutes irradiation indicated the time for breaking bond of hydroxyl group due to evaporation and re-arrangement of atomic bonding for >20 minutes irradiation. The result in this study as a guided for general public the time maximum irradiation by microwave in...

Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat, 2019

Journal of Nanomaterials, 2018

Nanocomposites, activated carbon/polyvinyl alcohol (AC/PVA) filled with Fe to form Fe/AC/PVA, wer... more Nanocomposites, activated carbon/polyvinyl alcohol (AC/PVA) filled with Fe to form Fe/AC/PVA, were characterized by using X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and vector network analyzer (VNA). The crystal orientations from Fe are (104), (110), and (200) and the bonding formations of AC are O-H, C-H, and C=C show existence in nanocomposites, which may be due to the Fe that has been filled the pore of AC via a chemical bond. 20% AC (3 mm in thickness) in nanocomposites shows higher performance absorption for C-band (4.65 GHz) with maximum reflection loss of −32.5 dB.

Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat, 2022

Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat, 2021

Technological processes for modification of materials, deposition, and prevented fumes in the pyr... more Technological processes for modification of materials, deposition, and prevented fumes in the pyrolysis processes are used gases materials in the medium with vacuum pressure or atmospheric air pressure. Therefore, it is essential to understand heat flow transport for designing an efficient reactor or find the substrate's excellent position in the reactor or furnace for growing materials. We evaluated the energy transfer phenomena in the form of temperature distribution and heat flow for various heating sources for the gases and solid materials by Gauss-Seidel equation. The thermal conductivity coefficient (k), number of heating sources, and position of heating sources show an essential parameter for transmitting the distribution of the heat. For high k value shows efficiently for heat transfer at low temperature due to the atom's position close each other. The heat also affects to the phonon and lattice vibration like a wave which successfully shows these phenomena in this st...

Measurement of Radon ( 222 Rn) radioactivity level at BATAN office Jakarta has been done. Radon i... more Measurement of Radon ( 222 Rn) radioactivity level at BATAN office Jakarta has been done. Radon is a radioactive emitting alpha particle, very dangerous to the health because if it is inhaled, will be accumulated in the lungs and cause lung cancer. The purpose of the research was to determine the activity concentration of 222 Rn in the workplace and to estimate the dose received by workers. The sampling method is purposive sampling, in several office rooms of the BATAN office (staff room, laboratory, and warehouse), measurement 222 Rn using RAD7 continuously for 24 hours. Based on the activity concentration of 222 Rn in the rooms, an estimate of the effective dose received by the workers while working indoors can be calculated. The results showed that exposure of 222 Rn gas radiation in the workplace was relatively varied, radiation exposure in warehouses was 18.90-32.90 (25.90) Bq.m -3 higher than in laboratory 8.20-34.00 (22.43) Bq.m -3 and staff room 5.40-29.60 (16.68) Bq.m -3 . ...

Karbon dots (C-dots) merupakan nanopartikel karbon dengan sifat berpendar dan dapat disintesis da... more Karbon dots (C-dots) merupakan nanopartikel karbon dengan sifat berpendar dan dapat disintesis dari berbagai sumber karbon.Tantangan sintesis C-Dots adalah memanfaatkan sumber daya alam sebagai bahan bakunya. Dalam penelitian ini, sintesis C-Dots dari daun mangga kering dan daun mangga segar telah berhasil dilakukan. C-Dots yang dihasilkan dari kedua bahan ini berbentuk koloid. Sintesis C-Dots dengan metode buttom up dengan cara radiasi microwave selama 30 menit. Sifat fisis warna C-Dots daun mangga kering menunjukkan warna cokelat gelap, sedangkan sifat fisis warna C-Dots daun mangga segar menunjukkan warna kuning terang. C-Dots daun mangga kering memiliki spektrum absorbansi cahaya pada panjang gelombang 290- 433 nm dengan intensitas tertinggi terukur pada panjang gelombang 382 nm. Sedangkan, untuk C-Dots daun mangga segar memiliki spektrum absorbansi cahaya pada panjang gelombang 290-385 nm dengan intensitas tertinggi terukur pada panjang gelombang 351 nm. Spektrum emisi C-Dots j...

Agriculture biomass has the potential to be used as feedstock for biomass production as energy re... more Agriculture biomass has the potential to be used as feedstock for biomass production as energy resources in the future. In this study, the physical properties of different kind of biomass based charcoals briquettes with the mixing ratios between the biomass charcoal and binding agents of 90:10, 80:20, and 70:30 was determined. Charcoal of groundnut shell, durian shell, and cassava peel were used to produce briquette biomass based charcoals. The binding agent was found to significantly affect to the physical properties. Moisture, ash, volatile matter and compressive strength increased with increasing the amount of binding agent. The briquettes which have similar properties with the SNI standard are briquette from groundnut shell for lowest (10%) amount of binding agent. The charcoal from groundnut shell had the highest silica content followed by durian shell and cassava peel. As the amount of silica is high, the carbon content and the calorific value also is high. Silica also can be ...

2021 3rd International Conference on High Voltage Engineering and Power Systems (ICHVEPS), 2021

The effect of economic and population growth rapidly contributes to the energy usage of buildings... more The effect of economic and population growth rapidly contributes to the energy usage of buildings increasing to high levels. To minimize the electrical energy consumption (EC), thermal insulation of wall has significant impact to minimizing the EC of building. The aim of this paper is to define the influence of wall on reducing EC of residential building with different wall characteristics. In this case, two different kinds of building characteristics were evaluated, namely: building-1 applied an innovative Cellular Lightweight Concrete (inCLC) brick and building-2 with wood applied to create the walls. Under numerical optimization, a mathematical model was developed to define the EC of air conditioning (AC). Based on the result of research indicated the EC of building-1 (IDR 25,365) was cheaper than building-2 (IDR 29,350). Consequently, the energy cost reduction (ECR) can be achieved to be IDR 3,985 (13.57%).

Luminescence, 2021

Carbon dots (CDs) are carbon nanoparticles with a size of less than 10 nm, and are synthesized fr... more Carbon dots (CDs) are carbon nanoparticles with a size of less than 10 nm, and are synthesized from various sources; they have been of great interest to scientists worldwide due to their unique optical, electrical, and chemical properties. Sources of carbon are inexpensive and can be classified as a renewable natural resources. Many researchers use CDs because of their low toxicity, better water solubility, high biocompatibility, and stable photoluminescence. The simple methods for producing CDs are hydrothermal and use inexpensive equipment, have low energy consumption, simple manipulation, and one‐step preparation. Since the discovery of CDs, researchers have used them in various applications such as sensing, bioimaging, drug delivery, and catalysis. In this review, CDs synthesized from natural resources such as samples from herbs, roots, leaves, flowers, and fruit and some applications are described. This review provides a summary of carbon dots that is expected to provide furthe...

Optical Materials, 2021

Abstract Structural, optical, and absorption properties of nano-composites iron powder/carbon nan... more Abstract Structural, optical, and absorption properties of nano-composites iron powder/carbon nano-sphere/polyvinyl alcohol (Fe/CNs/PVA) for electromagnetic (EM) wave absorber based on CNs from bamboo fiber studied by X-ray diffraction (XRD), Fourier transforms infra-red (FTIR), and vector network analyzer (VNA), respectively. The existence of the diffraction peaks identified by crystal orientation (hkl) (004), (224) and (115) with FWHM, strain, and working frequency increases with increasing the activation temperature indicated the formation of the new structures. These findings consistent with the distance (Δ(LO-TO)) between two optical phonon vibrations mode increases indicated that, the stable covalent bonding formation of Fe/CNs/PVA particles increase with increasing the temperature activation of CNs. Temperature activation of the CNs play an important role in expanding the frequency up to 5.56 GHz with reflection loss (RL) −23.16 dB, indicated that a new type absorber for attenuating 99% EM wave. This study shows that the FTIR spectra could be useful for determining the optical properties, phonon vibration, dielectric function, and energy loss function of composite Fe/CNs/PVA.

Journal of Physics: Conference Series, 2018

In this study, the image quality of CT scan using phantom American College of Radiology (ACR) was... more In this study, the image quality of CT scan using phantom American College of Radiology (ACR) was determined. Scanning multidetector CT is used to know the image quality parameters by using a solid phantom containing four modules and primarily from materials that are equivalent to water. Each module is 4 cm in diameter and 20 cm in diameter. There is white alignment marks painted white to reflect the alignment laser and there are also "HEAD", "FOOT", and "TOP" marks on the phantom to help align. This test obtains CT images of each module according to the routine inspection protocol of the head. Acceptance of image quality obtained for determination: CT Number Accuracy (CTN), CT Number Uniformity and Noise, Linearity CT Number, Slice Technique, Low Contrast Resolution and High Contrast Resolution represent image quality parameters. In testing CT Number Accuracy (CTN), CT Uniform number and Noise are in the range of tolerable values allowed. In the test, Linearity CT Number obtained correlation value above 0.99 is the relationship between electron density and CT Number. In a low contrast resolution test, the smallest contrast groups are visible. In contrast, the high resolution is seen up to 7 lp/cm. The quality of GE CT Scan is very high, as all the image quality tests obtained are within the tolerance brackets of values permitted by the Nuclear Power Control Agency (BAPETEN). Image quality test is a way to get very important information about the accuracy of snoring result by using phantom ACR.

Environmental Engineering Research, 2018

Journal of Inorganic and Organometallic Polymers and Materials, 2020

Ceramics International, 2020

Jurnal Elektronika dan Telekomunikasi, 2018

Monolithic design is one of the most promising dye-sensitized solar cell (DSSC) architectures to ... more Monolithic design is one of the most promising dye-sensitized solar cell (DSSC) architectures to develop, because it allows the elimination of one conductive substrate and offers the possibility for printing layer-by-layer of the materials that made up its structure. In this study, titanium dioxide-based monolithic type DSSCs were fabricated on a single fluorine-doped transparent oxide coated glass with TiO2 as photoanode and porous ZrO2 as spacer. The type of the carbon material used as the composite paste for the counter electrode was varied to see the effect on the solar cell efficiency. Four-point probes measurement revealed that the resistivity of the carbon layer synthesized using activated carbon exhibited slightly higher conductivity with a sheet resistance of 10.70 Ω/sq and 11.09 Ω/sq for activated carbon and carbon nanopowder, respectively. The efficiency of DSSC that uses activated carbon as counter electrode was higher (i.e. 0.221%) than the DSSC with carbon nanopowder (...

Journal of Dentomaxillofacial Science, 2018

Surface and Interface Analysis, 2019

Stopping power (SP) and inelastic mean free path (IMFP) of electrons in Ti, Fe, Ni, and Pd have b... more Stopping power (SP) and inelastic mean free path (IMFP) of electrons in Ti, Fe, Ni, and Pd have been determined by using dielectric models. We have used energy loss function (ELF) determined from quantitative analysis of experimental reflection electron energy loss spectroscopy (REELS) spectra as the input parameter for this model. ELF in this study was determined from the previously published quantitative analysis of REELS spectra. The SP of Fe, Ni, Pd, and Ti was compared with several calculation methods for energies from 100 eV to 10 keV and shows SP in this study, which are in best agreement for medium to high energies (greater than or equal to 300 eV). The IMFP obtained in this study shows the best agreement with online database TPP2M and NIST and also calculation by Tanuma with a root mean square (rms) less than 12%. The present approach shows ELF from quantitative analysis of REELS spectra has a high potential for the experimental determination of SP and IMFP of metals.

Journal of Physics: Conference Series, 2018

IOP Conference Series: Materials Science and Engineering, 2019

Structural, mechanical properties, and bonding characteristic of plastic bio-composites (starch/c... more Structural, mechanical properties, and bonding characteristic of plastic bio-composites (starch/chitosan) with an additional Pineapple leaf microfibers (PLM) for 3%, 6% and 9% were carried out by using X-Ray diffraction (XRD), tensile strength test, and Fourier transform infra-red (FTIR) spectroscopy, respectively. The value of tensile strength shows highest for plastic bi-composite with 9% PLM and also XRD spectra shows the amorphous phase with new structure was formed for all bio-composite + PLM. FTIR spectra shows the strong bonding formation as the effect of PLM indicated by increase the intensity of C-H and C=C bond with increasing the amount of PLM. From the biodegradation test shows the PLM strongly influenced to the degradation ability of bio-composite and the highest is for 9% PLM (>80% ). In addition, the lowest browning index is about 37.5% for bio-composite with additional 9% PLM which was determined by using fresh cherry (Muntingia calabura. L). It’s indicated that t...

Materials Science Forum, 2019

Purple sweet potato (Ipomoea batatas L) contains high anthocyanin and peonidin glycosides which a... more Purple sweet potato (Ipomoea batatas L) contains high anthocyanin and peonidin glycosides which are useful as powerful natural antioxidants. Microwaves is an electric oven that use for heats and cooks food by exposing electromagnetic radiation produce thermal energy which was influenced to the composition and structural properties of food. In this study, the effect of microwave irradiation on the structural and bonding characteristic of Ipomoea batatas L have been analysis by X-ray diffraction (XRD and Fourier transform infra-red (FTIR), respectively. The composition and the crystallite size was decreases with increasing the temperature and the time of irradiation. The intensity of functional group FTIR spectra shows for 20 minutes irradiation indicated the time for breaking bond of hydroxyl group due to evaporation and re-arrangement of atomic bonding for >20 minutes irradiation. The result in this study as a guided for general public the time maximum irradiation by microwave in...

Jurnal Fisika Flux: Jurnal Ilmiah Fisika FMIPA Universitas Lambung Mangkurat, 2019

Journal of Nanomaterials, 2018

Nanocomposites, activated carbon/polyvinyl alcohol (AC/PVA) filled with Fe to form Fe/AC/PVA, wer... more Nanocomposites, activated carbon/polyvinyl alcohol (AC/PVA) filled with Fe to form Fe/AC/PVA, were characterized by using X-ray fluorescence (XRF), X-ray diffraction (XRD), Fourier transform infrared (FTIR), and vector network analyzer (VNA). The crystal orientations from Fe are (104), (110), and (200) and the bonding formations of AC are O-H, C-H, and C=C show existence in nanocomposites, which may be due to the Fe that has been filled the pore of AC via a chemical bond. 20% AC (3 mm in thickness) in nanocomposites shows higher performance absorption for C-band (4.65 GHz) with maximum reflection loss of −32.5 dB.