Chiravoot Pechyen - Academia.edu (original) (raw)

Papers by Chiravoot Pechyen

International Journal of Polymer Science, 2016

Bacterial cellulose and eggshell composite was successfully developed. Eggshell was mixed with ba... more Bacterial cellulose and eggshell composite was successfully developed. Eggshell was mixed with bacterial cellulose suspension and it was casted as a composite film. CaCO 3 derived from eggshell was compared with its commercial availability. It can be noted that good dispersion of eggshell particle was prepared. Eggshell particle was irregular in shape with a variation in size. It existed in bacterial cellulose network. Characterization on composite was focused on thermal and mechanical properties. It showed that flexibility and thermal stability of composite were enhanced. No significant effect of mechanical properties was therefore observed. The thermal stability of composite was stable up to 300 ∘ C. The adsorption experiment on water and vegetable oil capacity was performed. The enhancement on adsorption was due to the existence of eggshell in bacterial cellulose composite. It exhibited the potential to be a good candidate for absorbent material in active packaging.

Carbohydrate Polymers, May 1, 2016

Cellulose based composite was successfully designed as active packaging with additional feature o... more Cellulose based composite was successfully designed as active packaging with additional feature of microwavable properties. Small amount of cellulose with 10 micron in diameter was integrated into polypropylene matrix. The use of maleic anhydride was employed as coupling agent. Thermal and mechanical properties of cellulose based composite were superior depending on polypropylene matrix. Crystallization temperature and compressive strength were estimated to be 130°C and 5.5 MPa. The crystal formation and its percentage were therefore estimated to be 50% and it can be predicted on the feasibility of microwavable packaging. Morphological properties of cellulose based composite presented the good distribution and excellent uniformity. It was remarkable to note that cellulose derived from cotton can be prepared as composite with polypropylene matrix. It can be used as packaging for microwave application.

Applied Clay Science, Nov 1, 2016

Fish water soluble protein (FWSP) film from the surimi washing process was prepared by solvent ca... more Fish water soluble protein (FWSP) film from the surimi washing process was prepared by solvent casting. The results demonstrated that FWSP-oleic acid had the highest tensile strength (TS) and elongation at break (%E) at 12.11 ± 2.39 MPa and 7.14 ± 3.17% respectively. Water vapor permeability (WVP) of FWSP-oleic acid was higher than FWSP-palmitic acid at 5.27 ± 0.50 × 10 −11 g m/m 2 s Pa. On the contrary, FWSP-oleic acid had the lowest oxygen permeability (OP) at 2.34 ± 0.14 cm 3 mm/m 2 d k Pa. FWSP-oleic acid with Mt content 5 g/ 100 g FWSP presented the lowest WVP. High amount of Mt loading resulted in an increase in the WVP and OP. The melting (T m) temperature of FWSP-oleic acid was~107°C but FWSP-stearic acid and FWSP-palmitic acid had two T m levels were~73°C~122°C and~88°C~127°C, respectively. FWSP-oleic acid with Mt content 5 g/100 g FWSP had the highest T m level at~113°C. The thermal stability of the films increased from~349 tõ 357°C with the addition of Mt content 20 g/100 g FWSP. The changes observed in the intensity of the bands corresponded to the amine group. It showed that FWSP interacts with Mt.

Colloid and Polymer Science, May 19, 2016

Nylon 6 and its modification as a compound have been employed in several applications such as in ... more Nylon 6 and its modification as a compound have been employed in several applications such as in the textile industry. To gain effectiveness in textile applications, nylon 6's self-cleaning and antibacterial properties were modified. ZnO was successfully synthesized using a wet chemical synthetic procedure. The thermal decomposition of the ZnO precursor was investigated using thermogravimetric analysis. The calcination temperature was set to be 500-1000°C for 2 h. Decomposition products of the organic phase were removed at temperatures ranging from 300 to 500°C. X-ray diffraction and scanning electron microscopy showed the single phase of ZnO and the variable-sized hexagonal-shaped cross-section, respectively. With incremental increases in the calcination temperature, there was no residue from char, and agglomeration of the ZnO increased. The ZnO was dispersed in methanol and subsequently spin-coated onto a nylon 6 surface. The efficiency of ZnO coating on the nylon 6 surface was investigated by the photocatalytic activity of methylene blue degradation. The apparent rate constant was estimated to be 0.5 by the Langmuir-Hinshelwood equation. The photocatalytic activity of ZnO coated on nylon 6 exhibited excellent performance for wastewater treatment in the textile industry.

Journal of Biobased Materials and Bioenergy, Jun 1, 2017

Polymer Bulletin, 2016

Isotactic polypropylene (PP) composite films were developed, with incorporation of CaCO 3 particl... more Isotactic polypropylene (PP) composite films were developed, with incorporation of CaCO 3 particles as active filler. Stearic acid was used for the surface treatment of CaCO 3 to provide composite films having improved mechanical, thermal and barrier properties against oxygen as well as water vapor, in comparison to neat PP films. The filler was melt mixed with PP in a twin-screw extruder, and the films produced through melt blowing. A slight reduction in T g values of the filled PP films was observed, along with an increase in the overall crystallization extent relative to neat PP films. X-ray diffraction data confirmed that the CaCO 3 particles served as a b-nucleating agent capable of promoting the formation of the b-crystalline phase of PP and reducing the spherulite size, with stearic acid-coated CaCO 3 being most effective in promoting these features. Exposing the films to microwave radiation altered their properties; at low irradiation power, the T g values and the degree of b-crystallization were enhanced, and barrier properties against oxygen and water vapor showed improvements. In contrast, no significant changes in the appearance of the film surface were evident highlighting the potential of these PP-based composite films in microwave packaging applications.

The effect of polypropylene/poly(lactic acid) weight ratios on the properties of blend films comp... more The effect of polypropylene/poly(lactic acid) weight ratios on the properties of blend films compatilized with polypropylenegrafted-maleic anhydride were investigated with 100:0, 60:40, 50:50, 40:60, and 0:100 of weight ratio. The blend films were prepared by melt mixing technique and cast film extrusion. The results shown that the FTIR spectrum was confirmed the interaction between compatibilizer and polymers. Morphological investigation was distinctly seen a two phases system between polypropylene and poly(lactic acid). Increasing of PLA content from 40 to 60 wt.% resulting in decreased melting temperature and crystallinity from 158 °C to 154 °C and 38% to 31%, respectively. For tensile properties, modulus and tensile strength increased with increasing the PLA content, while elongation at break was drastically decreased from 500% (polypropylene) to less than 50% (blends). The barrier properties indicated that incorporation of poly(lactic acid) into polypropylene tend to increased ...

Poly-β-hydroxybutyrate (PHB) is biodegradable plastics have received increased attention due to i... more Poly-β-hydroxybutyrate (PHB) is biodegradable plastics have received increased attention due to its properties that resemble those of petroleum-based plastics such as polyethylene. PHB could be accumulated within bacterial cells varying glucose concentration in the present study. The concentrations of 5, 10, 15 and 20 g L -1 glucose were employed as a single carbon source for the PHB production which compared between Alcaligenes eutrophus DSM 545 and A. eutrophus TISTR 1095. In shake flask culture, the maximum PHB concentrations were 9.437 g L -1 with 10 g L -1 glucose, and 1.679 g L -1 with 15 g L -1 glucose for A. eutrophus DSM 545 and A. eutrophus TISTR 1095, respectively. The highest PHB yield of 0.321 g PHB g -1 glucose was obtained from using 5 g L -1 glucose by A. eutrophus TISTR 1095. For A. eutrophus DSM 545, its highest PHB yield of 0.998 g PHB per g glucose was attainable from 10 g L -1 glucose. In addition, the production yield of PHB from A. eutrophus DSM 545 decreased ...

Cellulose based composite was successfully designed as composite. Small amount (10-40 wt%) of cel... more Cellulose based composite was successfully designed as composite. Small amount (10-40 wt%) of cellulose with 10 micron in diameter was integrated into polyethylene matrix. The use of maleic anhydride was employed as coupling agent. The excellent properties on compatibility between modified cellulose and polyethylene matrix were successfully prepared. Thermal and mechanical properties of cellulose based composite were superior depending on polyethylene. Thermal stability of composite was stable up to 300°C. In addition, significant enhancement on tensile strength and Young’s modulus of composite was double compared to neat polyethylene matrix. Morphological properties of cellulose based composite presented the good distribution and excellent uniformity. Cellulose network was filled by polyethylene matrix. Uniformity and distribution in size of cellulose was prepared. It was remarkable to note that cellulose derived from cotton can be prepared as composite with polyethylene matrix.

Advanced Science Letters, 2012

Journal of Materials Research and Technology

Acta Amazonica, 2013

Na região amazônica, algumas indústrias despejam cobre nos corpos receptores que, em elevadas con... more Na região amazônica, algumas indústrias despejam cobre nos corpos receptores que, em elevadas concentrações, é tóxico para os seres vivos. A remoção de cobre de efluentes industriais é realizada por diversos processos como a adsorção. Neste trabalho mostrou-se o resultado da adsorção de cobre (II) em carvão ativado de caroço de buriti carbonizado a 400 °C e ativado a 900 °C. O carvão ativado foi caracterizado em termos de área específica, tamanho dos poros, densidades aparente e real, porosidade, microscopia eletrônica de varredura, conteúdo de cinzas, pH, umidade, carbono fixo e grupos funcionais de superfície. O estudo de equilíbrio de adsorção avaliou a influência do diâmetro das partículas do carvão, do tempo de contato adsorvente/adsorbato, do pH e da concentração inicial da solução de cobre (II) sobre a remoção de cobre (II). Com base nos resultados, concluiu-se que há uma maior eficiência de remoção de cobre (II) para diâmetro < 0,595 mm, tempo de contato de 300 minutos, p...

Journal of The Electrochemical Society, 2022

This study reports an electrochemical sensor based on multiwalled carbon nanotubes/gold nanoparti... more This study reports an electrochemical sensor based on multiwalled carbon nanotubes/gold nanoparticles (MWCNTs/AuNPs) for detection of total hemoglobin (Hb) and glycated hemoglobin (HbA1c) in blood samples. Measurement of glycated hemoglobin percentage (%HbA1c) is crucial to the monitoring of glycemia in diabetes patients. The %HbA1c, which refers to the concentration ratio of HbA1c to total hemoglobin (Hb), has been widely used for accurate determination of stage-wise diabetes. The gold nanoparticles (AuNPs) used in the sensor were synthesized using a biological method employing passion fruit peel extracts. The resulting AuNPs are spherical with diameter approximately 18 nm, and these can be mixed with MWCNTs in various ratios to form MWCNTs/AuNPs composites. TEM imaging indicates that gold nanoparticles decorate the surface of the MWCNTs. Coating of a screen-printed carbon electrode (SPCE) with MWCNTs/AuNPs affords the novel MWCNTs/AuNPs/SPCE electrode, which exhibits a linear resp...

Energy Technology 2018, 2018

Activated carbons, derived from waste ion-exchange resin by CO2 physical activation, were applied... more Activated carbons, derived from waste ion-exchange resin by CO2 physical activation, were applied to separate CO2 from flue gas against global warming. The BET specific surface areas of activated carbons at different activation temperatures and times were investigated. The CO2 adsorption capacity was tested under non-isothermal and isothermal conditions. The experimental results show that when keeping the activation temperature constant, the specific surface area increases firstly and then decreases with increasing activation time. For the given activation time, the specific surface area rises firstly and then declines with increasing activation temperature. The adsorption capacity decreases with increasing temperature. The maximum adsorption capacity is 51.46 mg/g under the condition of 298 K and pure CO2. Fractional order kinetic model is the best one to describe the kinetics of CO2 adsorption. The activated carbons show the potential to be an effective adsorbent for the removal of CO2 from flue gas.

Results in Physics, 2018

Effect of injection parameters on mechanical and physical properties of super ultra-thin wall pro... more Effect of injection parameters on mechanical and physical properties of super ultra-thin wall propylene packaging by Taguchi method, Results in

Renewable and Sustainable Energy Reviews, 2016

The use of bio-based waste gained many interests exponentially for supporting on the use of non-t... more The use of bio-based waste gained many interests exponentially for supporting on the use of non-toxic materials. During the last three decades, bio-based waste in form of bio-based polymer and bio-based ceramic such as cellulose, chitin-chitosan, porous clay, eggshell, activated carbon and so on have been extensively designed for being as sorbent material. The use of bio-based waste was encourages due to low cost of materials and availability of product. Moreover, due to sustainable concept on the use of biobased waste, numerous innovative processes have been extensively employed to modify on surface and structure in order to tailor the excellent performance as sorbent material. The example of process was due to chemical treatment and physical modification. Additional information on bio-based sorbent material will provide significant idea on energy policy in future. In this review article, the objective was to present on the overview on bio-based waste and its modification technique and the potential application as sorbent material for energy policy will be discussed.

Journal of Biobased Materials and Bioenergy, 2017