研究者詳細 - 安藤　義人

論文 - 安藤　義人

分割表示185 件中 81 - 100 件目／全件表示 >>

Tailored higher performance silicone elastomer with nanofibrillated cellulose through acidic treatment 査読有り国際誌

Mustapha S., Andou Y.

Polymer Composites ( Wiley ) 42 ( 5 ) 2282 - 2292 2021年05月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Nanofibrillated cellulose (NFC) can be used for reinforcer to silicone polymer to expect enhancement of its mechanical strength. However, NFC is a hydrophilic material, which typically poor-dispersed characteristic in non-polar polymer matrices. To overcome this bothersome characteristic, surface modification of NFC has been studied to tailor the interfacial interactions between NFC and matrices for fiber dispersibility in matrices. In this work, NFC was treated with some acids to modify a functional group in NFC. The acid treatment approaches successfully introduced the functional groups onto NFC surface, which confirmed by FT-IR, TGA, and SEM-EDS analyses. Moreover, the XRD analysis revealed that this treated NFC was the cellulose type I and acid treatments did not vary it. The TGA results showed lower thermal degradation of all treated NFC as compared to control NFC. Additionally, the effects of treated NFC as nanofiller in the silicone elastomer were evaluated the mechanical properties. The treated NFC also showed a good dispersibility in silicone composite, and no agglomeration was observed. Moreover, the tensile strength and elongation of silicone composite with treated NFC as nanofiller showed high performance compare to silicone composite with pristine NFC. The highest tensile value was recorded at 3.4 MPa in silicone/NFC-P samples using phosphoric acid-treated NFC. Therefore, a low concentration of acid treatments has the potential to be an effective method as a surface modification of NFC.

DOI： 10.1002/pc.25976

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PCPDTBT copolymer based high performance organic phototransistors utilizing improved chain alignment 査読有り国際誌

Yadav N., Kumari N., Ando Y., Pandey S.S., Singh V.

Optical Materials 113 2021年03月

記述言語：英語掲載種別：研究論文（学術雑誌）

In this article, we report single component thin film based organic phototransistors (OPTs) developed using the novel ribbon-floating film transfer method (ribbon-FTM). A low band-gap copolymer, poly[2,6-(4,4-bis-(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b']dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] (PCPDTBT) has been employed to develop the photoactive thin films of the devices. The fabricated polymer films were highly anisotropic in nature. To investigate the effect of film anisotropy on the device performance, organic field effect transistors (OFETs) were fabricated in two configurations namely, parallel and perpendicular, wherein the polymeric chains were oriented in line and orthogonal to the transistor channel direction, respectively. Notable differences in charge carrier mobility and device on-off ratios were observed among the two sets of devices. An on-off ratio of 4.1 × 103 and an average mobility of 0.001 cm2/V were observed in case of the perpendicular oriented OFETs which were increased to 105 and 0.003 cm2/V for the parallel oriented OFETs. A probe into the contact resistance at the respective metal/polymer interfaces of the devices was carried out using the modified transmission line method (MTLM). 4 times lower contact resistance was observed in the parallel OFET which was anticipated to be responsible for its superior performance. Further, the fabricated devices were illuminated with monochromatic red light (Pin = 0.4 mW/cm2) to observe their performance as phototransistors. Appreciable values of photosensitivity (2 × 104) and photoresponsivity (17.6 A/W) were obtained for the parallel OPTs which were found to be much higher than those of the previously reported thin film based OPTs employing other materials fabricated through conventional film coating techniques. The results presented in this report are of key significance towards the development of highly sensitive and cost-effective phototransistors which can be used in opto-sensing and imaging applications.

DOI： 10.1016/j.optmat.2021.110886

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Cadmium(II) and copper(II) complexes containing benzoate derivatives and 2-aminopyrimidine ligands: Synthesis, crystal structures and antibacterial activity 査読有り国際誌

安藤　義人

Journal of Physics: Conference Series 2021年02月

Detection and remediation of bisphenol A (BPA) using graphene-based materials: mini-review 査読有り

Zheng A.L.T., Andou Y.

International Journal of Environmental Science and Technology 19 ( 7 ) 6869 - 6888 2021年01月

担当区分：責任著者記述言語：英語掲載種別：記事・総説・解説・論説等（学術雑誌）

The widespread use of bisphenol A (BPA), a plastic additive, is becoming a troubling trend due to its harmful effects on the environment. To date, graphene-based materials (GBMs) have piqued interest among researchers in the detection and remediation of BPA attributed to their salient properties of having large surface area, high conductivity, high functionalities, etc. Recent progress in GBMs has provided researchers with a wide array of synthesis techniques for various applications. Unfortunately, literature pertaining GBMs lagged in providing up-to-date research in BPA detection and remediation. Often, published review articles focused on the wide array of pollutants detection and remediation without a specific focus on a single pollutant. Hence, this review intends to reduce the knowledge gap by focusing on the recent studies pertaining usage of GBMs applications as electrochemical-based sensors and remediators via adsorption and photocatalysis of BPA. In sensing applications, GBMs sensors have evolved to be among the preferred choice for the detection of BPA. Provided that ample comprehensive reviews on the usage of GBMs as adsorbents and photocatalyst for various pollutants have been previously published, we focused our discussion solely on BPA as the model pollutant by providing up-to-date information on their synthesis route and performance ability. Certainly, this review will be useful to new entrants and experienced researchers intending to employ GBMs as the material of interest for the detection and remediation of BPA.

DOI： 10.1007/s13762-021-03512-x

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Surface functionalization of biochar from oil palm empty fruit bunch through hydrothermal process 査読有り国際誌

Ibrahim I., Tsubota T., Hassan M.A., Andou Y.

Processes ( MDPI ) 9 ( 1 ) 1 - 14 2021年01月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

The use of biochar as an adsorbent for wastewater treatment purposes has been hindered due to its lower surface area compared to activated carbon. Current research on increasing surface functional groups on biochar surfaces to improve its adsorption performance suggests using high chemical concentration and long period of modification. This study solves these problems by focusing on improving surface functionalities of biochar via the hydrothermal functionalization process. Oil palm empty fruit bunch biochar was functionalized using autoclave with nitric acid as the functionalization agent. Functionalized biochar properties such as Brunauer–Emmett–Teller (BET) surface area and surface functional groups were analyzed and compared with untreated biochar. Fourier Transform Infrared (FTIR) spectroscopic analysis shows a significant increase in absorption by oxygen functional groups and is corroborated with energy dispersive X-ray (EDX) analysis. The process does not result in any major change in surface morphology and reduction in surface area value. Methylene blue (MB) adsorption test shows 7 times increase in adsorption performance. These results show that the simple hydrothermal functionalization process successfully functionalizes the biochar surface and improves its performance without affecting its surface area at lower concentration, and shorter time compared to previous studies. This result, with future large-scale experimentation using real-life equipment in palm oil mills, would provide a better technology that can be implemented in the industry.

DOI： 10.3390/pr9010149

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Plant-based tacca leontopetaloides biopolymer flocculant (TBPF) produced high removal of heavy metal ions at low dosage 査読有り国際誌

Makhtar N.S.M., Idris J., Musa M., Andou Y., Hamid K.H.K., Puasa S.W.

Processes ( MDPI ) 9 ( 1 ) 1 - 14 2021年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

High removal of heavy metals using plant-based bioflocculant under low concentration is required due to its low cost, abundant source, and nontoxicity for improved wastewater management and utilization in the water industry. This paper presents a treatment of synthetic wastewater using plant-based Tacca leontopetaloides biopolymer flocculant (TBPF) without modification on its structural polymer chains. It produced a high removal of heavy metals (Zn, Pb, Ni, and Cd) at a low concentration of TBPF dosage. In our previous report, TBPF was characterized and successfully reduced the turbidity, total suspended solids, and color for leachate treatment; however, its effectiveness for heavy metal removal has not been reported. The removal of these heavy metals was performed using a standard jar test procedure at different pH values of synthetic wastewater and TBPF dosages. The effects of hydroxide ion, pH, initial TBPF concentration, initial metal ion concentration, and TBPF dosage were examined using one factorial at the time (OFAT). The results show that the highest removal for Zn, Pb, Ni, and Cd metal ions were 98.4–98.5%, 79–80%, 97–98%, and 92–93%, respectively, using 120 mg/L dosage from the initial concentration of 10% TBPF at pH 10. The final concentrations for Zn, Pb, Ni, and Cd metal ions were 0.043–0.044, 0.41–0.43, 0.037–0.054, and 0.11–0.13 mg/L, respectively, which are below the Standard B discharge limit set by the Department of Environment (DOE), Malaysia. The results show that TBPF has a high potential for the removal of heavy metals, particularly Zn, Pb, Ni, and Cd, in real wastewater treatment.

DOI： 10.3390/pr9010037

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Melt-vs. Non-melt blending of complexly processable ultra-high molecular weight polyethylene/cellulose nanofiber bionanocomposite 査読有り国際誌

Sharip N.S., Ariffin H., Yasim-Anuar T.A.T., Andou Y., Shirosaki Y., Jawaid M., Tahir P.M., Ibrahim N.A.

Polymers ( MDPI ) 13 ( 3 ) 1 - 15 2021年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

The major hurdle in melt-processing of ultra-high molecular weight polyethylene (UHMWPE) nanocomposite lies on the high melt viscosity of the UHMWPE, which may contribute to poor dispersion and distribution of the nanofiller. In this study, UHMWPE/cellulose nanofiber (UHMWPE/CNF) bionanocomposites were prepared by two different blending methods: (i) melt blending at 150◦C in a triple screw kneading extruder, and (ii) non-melt blending by ethanol mixing at room temperature. Results showed that melt-processing of UHMWPE without CNF (MB-UHMWPE/0) exhibited an increment in yield strength and Young’s modulus by 15% and 25%, respectively, compared to the Neat-UHMWPE. Tensile strength was however reduced by almost half. Ethanol mixed sample without CNF (EM-UHMWPE/0) on the other hand showed slight decrement in all mechanical properties tested. At 0.5% CNF inclusion, the mechanical properties of melt-blended bionanocomposites (MB-UHMWPE/0.5) were improved as compared to Neat-UHMWPE. It was also found that the yield strength, elongation at break, Young’s modulus, toughness and crystallinity of MB-UHMWPE/0.5 were higher by 28%, 61%, 47%, 45% and 11%, respectively, as compared to the ethanol mixing sample (EM-UHMWPE/0.5). Despite the reduction in tensile strength of MB-UHMWPE/0.5, the value i.e., 28.4 ± 1.0 MPa surpassed the minimum requirement of standard specification for fabricated UHMWPE in surgical implant application. Overall, melt-blending processing is more suitable for the preparation of UHMWPE/CNF bionanocomposites as exhibited by their characteristics presented herein. A better mechanical interlocking between UHMWPE and CNF at high temperature mixing with kneading was evident through FE-SEM observation, explains the higher mechanical properties of MB-UHMWPE/0.5 as compared to EM-UHMWPE/0.5.

DOI： 10.3390/polym13030404

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Hydrothermally reduced graphene hydrogel intercalated with divalent ions for dye adsorption studies 査読有り国際誌

Zheng A.L.T., Boonyuen S., Ohno T., Andou Y.

Processes ( MDPI AG ) 9 ( 1 ) 1 - 22 2021年01月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Fundamental studies involving divalent ion intercalated graphene-based hydrogel are still lacking in terms of their adsorption behavior towards dye pollutants. In this study, we prepared a self-assembled Mg2+ and Ca2+ intercalated reduced graphene hydrogel (rGH) using hydrothermal treatment to evaluate the intercalation impact on the adsorption capability towards cationic dyes, methylene blue and rhodamine B. The morphological, structural, thermal, and textural properties of the divalent ion intercalated reduced graphene hydrogels were studied using Fourier transform infrared spectrometer, thermogravimetric analysis, Raman spectroscopy, scanning electron microscope-energy dispersive spectroscopy, X-ray photoelectron spectroscopy, Brunauer–Emmett– Teller surface area analysis, and X-ray diffraction. The increased adsorption capacity of the divalent ion intercalated reduced graphene-based hydrogels towards the dye molecules resulted from the increase in the specific surface area and pore volume due to the Mg2+ and Ca2+ bridging that formed spaces between the graphene sheets framework. Adsorption kinetics and the equilibrium adsorption isotherm were fitted by a pseudo-second-order alongside intraparticle diffusion kinetic models and Langmuir isotherm respectively. In addition, the divalent ion intercalated reduced graphene hydrogel showed good generation after three cycles of simultaneous adsorption.

DOI： 10.3390/pr9010169

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Enhancing Mechanical Properties of Polyurethane with Cellulose Acetate as Chain Extender 査読有り国際誌

Mustapha S., Andou Y.

Fibers and Polymers ( Springer Science and Business Media LLC ) 22 ( 8 ) 2112 - 2118 2021年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Polyurethanes (PUs) are a class of versatile engineering materials synthesized by the reaction between polyol, isocyanate, and chain extender as the hardener. Among various cellulose derivatives, cellulose acetate (CA) possessed unique features such as excellent mechanical properties, good thermal stability, tailorable surface chemistry, and can be used as hydroxyl providers to enhance the properties of PUs. Our goal is to develop a simple method to prepare PUs by using varying weight ratio of CA as the chain extender or crosslinking agent. PUs modified with varying weight percentage of CA (5 %, 10 %, and 30 %) (based on total parts per weight of poly(tetramethylene oxide) (PTMO) and isocyanate) were compared with PUs modified with 1,4-butanediol (BD), acting as the control. The morphological, chemical structural, thermal stability, and mechanical properties of the modified PU CA polymer were investigated thoroughly. The findings from this study found that modified PUs with CA possessed higher thermal stability. The PUs with 10 % of CA as chain extender was found to be the optimal percentage for the preparation of PUs with the highest tensile strength and elongation properties. However, the utilisation of higher weight percentage of CA reduced the elongation property of the modified PUs due to excessive crosslinking effect.

DOI： 10.1007/s12221-021-0789-0

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Development of High-Sensitivity Poly(2,7-(9,9-dioctylfluorene)-alt-5,5-(4′,7′-di-2-thienylbenzo [c][1,2,5]thiadiazole)) Thin-Film-Based Phototransistors by the Ribbon-Floating Film Transfer Method 査読有り国際誌

Yadav N., Kumari N., Ando Y., Pandey S.S., Singh V.

Physica Status Solidi - Rapid Research Letters 15 ( 8 ) 2021年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Alignment of polymer chains holds the key to the development of highly functional polymer-based field-effect transistors (FETs). The recently developed ribbon-floating film transfer method (ribbon-FTM) has the potential for development of polymer thin films with highly aligned chains, which are desirable for fabrication of efficient planar devices. These thin films consisting of well-aligned polymer chains exhibit high degree of optical and electronic anisotropies. Herein, ribbon-FTM-processed thin-film-based organic photosensitive transistors of poly(2,7-(9,9-dioctylfluorene)-alt-5,5-(4′,7′-di-2-thienylbenzo [c][1,2,5]thiadiazole)) (PFO-DBT) are reported. Under optimized fabrication conditions, polymer FETs based on PFO-DBT demonstrate a charge carrier mobility of 0.002 cm2 V−1 s−1 and an on–off ratio of 5 × 104 under dark conditions. The devices further demonstrate a photosensitivity of ≈104 and 103 and a high responsivity of 8.37 and 4.6 A W−1 against green and red light illuminations, respectively. The results hold promise for the development of conducting-polymer-based high-performance photosensitive organic field-effect transistors (OFETs).

DOI： 10.1002/pssr.202100185

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Effect of drying methods and parameters on the antioxidant properties of tea (Camellia sinensis) leaves 査読有り国際誌

Roslan A.S., Ismail A., Ando Y., Azlan A.

Food Production, Processing and Nutrition 2 ( 1 ) 2020年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

Background: Conventional drying using heated air oven is commonly used as a method for preserving the product but often affects the nutritional value, taste, and texture. However, the heat from the drying method can oxidize and destroy heat-sensitive compounds. Superheated steam (SHS) drying uses superheated steam instead of hot air or combustion gases in a direct dryer and was reported better at preserving the nutritional values of food products. Aim: To evaluate the effect of SHS drying on antioxidant properties of tea leaves. The study also compared SHS drying with conventional and freeze-drying methods. Results: Tea leaves dried using freeze drying retained the highest level of antioxidant properties compared to other drying methods. The leaves dried using SHS exhibited significantly higher radical scavenging activity, ORAC and FRAP values compared to oven drying method. At different drying temperatures (150 °C and 175 °C), oven dried leaves showed significantly higher (p < 0.05) antioxidant properties than that of SHS dried ones. Tea leaves dried for 60, 75, and 90 min using SHS showed significantly higher (p < 0.05) FRAP and ORAC values, and also total phenolic content compared to oven dried tea leaves. Conclusion: Tea leaves dried using SHS drying method retained higher level of antioxidant properties compared to oven drying. The drying method also retained lower antioxidant properties as drying time increased. Further study involving SHS drying in food-related fields should be conducted to support its usefulness. Graphical abstract: [Figure not available: see fulltext.]

DOI： 10.1186/s43014-020-00022-0

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Process optimization of ultra-high molecularweight polyethylene/cellulose nanofiber bionanocomposites in triple screw kneading extruder by response surface methodology 査読有り国際誌

Sharip N.S., Ariffin H., Andou Y., Shirosaki Y., Bahrin E.K., Jawaid M., Tahir P.M., Ibrahim N.A.

Molecules ( MDPI AG ) 25 ( 19 ) 4498 - 4498-17 2020年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

Incorporation of nanocellulose could improve wear resistance of ultra-high molecular weight polyethylene (UHMWPE) for an artificial joint application. Yet, the extremely high melt viscosity of the polymer may constrict the mixing, leading to fillers agglomeration and poor mechanical properties. This study optimized the processing condition ofUHMWPE/cellulose nanofiber (CNF) bionanocomposite fabrication in triple screw kneading extruder by using response surface methodology (RSM). The effect of the process parameters-temperature (150-190°C), rotational speed (30-60 rpm), and mixing time (30-45 min)-on mechanical properties of the bionanocomposites was investigated. Homogenous filler distribution, as confirmed by scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) analysis, was obtained through the optimal processing condition of 150 °C, 60 rpm, and 45 min. TheUHMWPE/CNFbionanocomposites exhibited improved mechanical properties in terms of Young's and flexural modulus by 11% and 19%, respectively, as compared to neat UHMWPE. An insignificant effect was observed when maleic anhydride-grafted-polyethylene (MAPE) was added as compatibilizer. The obtained results proved that homogenous compounding of high melt viscosity UHMWPE with CNF was feasible by optimizing the melt blending processing condition in triple screw kneading extruder, which resulted in improved stiffness, a contributing factor for wear resistance.

DOI： 10.3390/molecules25194498

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Synthesis of silver nanoparticles /porphyrin/reduced graphene oxide hydrogel as dye adsorbent for wastewater treatment 査読有り国際誌

Author links open overlay panelAlvinLim Teik Zheng,Tossapon Phromsatit, Supakorn Boonyuen, Yoshito Andou

FlatChem ( ELSEVIER ) 23 100174 2020年06月

担当区分：最終著者,　責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

Facile and versatile strategies for the preparation of reduced graphene oxide hydrogel (rGH) are of great interest due to its various applications in pollution adsorption, catalysis, gas sensors and tissue engineering. In this study, the preparation of a novel self-assembled reduced graphene oxide hydrogel modified with silver nanoparticles (AgNPs) and various porphyrin complexes using the green hydrothermal approach were reported. The AgNPs were successfully decorated on the reduced graphene sheets via electrostatic interactions. On the other hand, the interaction of porphyrin complex with the Ag/rGH is via esterification and π-π interactions. Based on thermogravimetric analysis and BET analysis, the intercalation of porphyrin complex improved the thermal stability and specific surface area (SSA) of the modified hydrogels. Further characterizations of the modified hydrogel were accomplished using Raman spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectrometer (FT-IR), scanning electron microscope-energy dispersive spectroscopy (SEM/EDS), and UV–Vis spectrophotometry. The adsorption capacity of the modified hydrogels increased with the integration of AgNPs and porphyrin complexes due to the increase of the number of adsorption sites. The Ag/TPP/rGH exhibited the highest adsorption capacity (130.37 mg/g) towards the cationic dye, methylene blue (MB) which is attributed to the additional binding sites from the available unoccupied aromatic structures of the TPP. All prepared hydrogels kinetic reaction conformed to the pseudo second-order model with good stability for removing MB with efficiency above 90%.

DOI： 10.1016/j.flatc.2020.100174

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Modification of cellulose degree of polymerization by superheated steam treatment for versatile properties of cellulose nanofibril film 査読有り国際誌

Liana Noor Megashah, Hidayah Ariffin, Mohd Rafein Zakaria, Mohd Ali Hassan, Yoshito Andou, Farah Nadia Mohammad Padzil

Cellulose ( Springer ) 27 ( 13 ) 7417 - 7429 2020年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

Cellulose from oil palm empty fruit bunch (OPEFB) was subjected to superheated steam (SHS) treatment at 150 °C for 1 and 2 h to produce cellulose with different degree of polymerization (DP). The treated OPEFB cellulose was subjected to a wet disc milling process to produce cellulose nanofibrils (CNFs), followed by nanocellulose film production using casting-evaporation technique. Reduction of DP by 23 and 40% were recorded after SHS treatment of OPEFB cellulose for 1 h (SHS1) and 2 h (SHS2), respectively, as compared to the untreated OPEFB cellulose. CNFs produced from treated cellulose (CNF-SHS1 and CNF-SHS2) exhibited smaller diameter and were less entangled compared to CNF from untreated cellulose (CNF-UT). These contributed to smoother CNF-SHS films. The highest light transmittance was recorded for CNF-SHS2 film, followed by CNF-SHS1 and CNF-UT films. The increment in transmittance value is in accordance with the reduction in cellulose DP. Lower DP also caused CNF-SHS films to have less wetting property as a result of smoother film surface. Mechanical properties were affected by DP values suggesting the possibility to control mechanical properties of CNF films in relation to DP. Overall, SHS is an efficient treatment method to reduce cellulose DP with the advantage of controlling CNF film properties towards the production of a versatile CNF film.

DOI： 10.1007/s10570-020-03296-2

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Plant-Based Tacca leontopetaloides Biopolymer Flocculant (TBPF) Produced High Removal of Turbidity, TSS, and Color for Leachate Treatment 査読有り国際誌

Nurul Shuhada Mohd Makhtar,Juferi Idris,Mohibah Musa ,Yoshito Andou,Ku Halim Ku Hamid, Siti Wahidah Puasa

Processes ( MDPI ) 8 ( 5 ) 527 2020年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

Wastewater treatment is crucial to ensure a sustainable supply of clean water, especially for human use. Natural flocculants can overcome the disadvantages of chemical flocculants in wastewater treatment. This study proposes a new natural-based flocculant from the Tacca leontopetaloides plant for leachate treatment. The plant tuber was processed through gelatinization to produce Tacca leontopetaloides biopolymer flocculant (TBPF). The characterization of TBPF for flocculant properties was investigated, and the performance of TBPF on leachate treatment using a standard jar test procedure was examined at different pH values of leachate and TBPF dosages. The characteristics of TBPF in terms of amylose/amylopectin fraction, viscosity, and zeta potential were 26:74, 0.037-0.04 Pa·s, and-13.14 mV, respectively. The presence of-COOH and-OH structure in TBPF indicates the flocculant properties. TBPF reduced the turbidity, total suspended solids (TSS), and color from 218 NTU, 214 mg/L, 14201 PtCo to 45.8-54.5 NTU, 19.3-19.9 mg/L, and 852-994 PtCo, respectively, using 240 mg/L of TBPF at pH 3. These results show a high potential of the new plantbased TBPF for leachate treatment and water industry applications.

DOI： 10.3390/pr8050527

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Well-Dispersed Cellulose Nanofiber in Low Density Polyethylene Nanocomposite by Liquid-Assisted Extrusion 査読有り国際誌

Yasim-Anuar T.A.T., Ariffin H., Norrrahim M.N.F., Hassan M.A., Andou Y., Tsukegi T., Nishida, H.

Polymers ( MDPI ) 12 ( 4 ) 927 2020年04月

記述言語：英語掲載種別：研究論文（学術雑誌）

Two different liquid assisted processing methods: internal melt-blending (IMB) and twin-screw extrusion (TWS) were performed to fabricate polyethylene (PE)/cellulose nanofiber (CNF) nanocomposites. The nanocomposites consisted maleic anhydride-grafted PE (PEgMA) as a compatibilizer, with PE/PEgMA/CNF ratio of 97/3/0.5-5 (wt./wt./wt.), respectively. Morphological analysis exhibited that CNF was well-dispersed in nanocomposites prepared by liquid-assisted TWS. Meanwhile, a randomly oriented and agglomerated CNF was observed in the nanocomposites prepared by liquid-assisted IMB. The nanocomposites obtained from liquid-assisted TWS exhibited the best mechanical properties at 3 wt.% CNF addition with an increment in flexural strength by almost 139%, higher than that of liquid-assisted IMB. Results from this study indicated that liquid feeding of CNF assisted the homogenous dispersion of CNF in PE matrix, and the mechanical properties of the nanocomposites were affected by compounding method due to the CNF dispersion and alignment.

DOI： 10.3390/polym12040927

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Characterization of silane treated Malaysian Yankee Pineapple AC6 leaf fiber (PALF) towards　industrial applications 査読有り国際誌

M.I. Najeeb, M.T.H. Sultan, Yoshito Andou, A.U.M Shah, Kubra Eksiler, M. Jawaid, A.H. Ariffin.

Journal of Materials Research and Technology ( Elsevier ) 9 ( 3 ) 3128 - 3139 2020年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

This research studied the effects of silane treatment at different soaking time: 1, 3, 5 h,on the properties of new variant Yankee's Pineapple AC6 leaf fiber (PALF). The propertiesof untreated and treated PALF was evaluated through several testing. The Si element wasfound on all treated fiber's surface through Energy-Dispersive X-ray, while significant peakswere clearly seen for these treated fibers at 1317.81 and 1100 cm-1 by Fourier TransformInfrared Spectroscopy. X-Ray Diffractor analyses showed small changes on the crystallinityof all treated fiber disregards the treatment and soaking time as compared to untreatedfiber. Improvement on the degradation temperature of all treated fibers to 360°C from 340°C was seen from the thermogravimetric analysis. Maximum surface roughness and tensilestrength were found for treated fibers at 3 h soaking time by atomic force microscope andsingle fiber testing respectively. The analyses suggested the potential Yankee's PALF to beused in composites for various industrial applications.

DOI： 10.1016/j.jmrt.2020.01.058

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85081697697&origin=inward

Characterization of Lignocellulosic Biomass from Malaysian’s Yankee Pineapple AC6 Toward Composite Application 査読有り

M.I. Najeeb, M.T.H. Sultan, Yoshito Andou, A.U.M Shah, Kubra Eksiler, M. Jawaid, A.H. Ariffin.

Journal of Natural Fibers 2020年01月

Nutritional characteristics of biochar from pineapple leaf residue and sago waste 査読有り

Bohari N., Mohidin H., Idris J., Andou Y., Man S., Saidan H., Mahdian S.

Pertanika Journal of Science and Technology 28 ( Special issue 2 ) 273 - 286 2020年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

Biochar produced from biomass with high nutrient content is essential for improving the quality of agricultural soils. An abundance of biomass is converted into biochar with high nutrient content, but studies on the conversion of pineapple and sago waste into biochar are still limited. This research aimed to produce biochar from pineapple leaf (PLB), sago bark (SBB), and sago pith (SPB) through the carbonization process with low temperature. The samples were carbonized using a laboratory electric oven at a low temperature of 350°C. The raw biomass and biochar produced were then subjected to elemental analysis and characterization. The mineral contents of carbonized biochar such as K, N, S, Mg, and Ca increased from those of the feedstock concentrations. For PLP, K element increased 24-fold from 2.44 ± 0.73% to 48.32 ± 9.92%, while N element increased from 6.13 ± 2.39% to 8.33 ± 5.34%. However, for both SBB and SPB, N and K nutrients increased by 2-fold. The study reveals that pineapple leaf biochar has the potentials to be used as an alternative soil amendment to elevate soil nutrient and quality.

DOI： 10.47836/pjst.28.S2.21

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85102704045&origin=inward

Static mechanical, thermal stability, and interfacial properties of superheated steam treated oil palm biomass reinforced polypropylene biocomposite 査読有り

Warid M.N.M., Yasim-Anuar T.A.T., Ariffin H., Hassan M.A., Andou Y., Shirai Y.

Pertanika Journal of Science and Technology 28 ( Special issue 2 ) 287 - 298 2020年01月

記述言語：英語掲載種別：研究論文（学術雑誌）

In this study, three types of oil palm biomass (OPB) namely, oil palm mesocarp fiber (OPMF), oil palm empty fruit bunch (OPEFB) and oil palm frond (OPF), were studied and compared as the alternative fillers in the biocomposite reinforced polypropylene (PP). The fibers were treated using the optimal condition of superheated steam treatment obtained from previous study. The OPB/PP biocomposites at weight ratio of 30:70 were fabricated by melt blending technique and hot pressed moulding. Results showed that the tensile and flexural properties of optimized-SHS-treated OPB/PP biocomposites were improved by 9 – 30% and 9 – 12%, respectively compared to the untreated OPB/PP biocomposites. The same observation was recorded for thermal stability. Improved surface morphology as shown by the tensile fracture surface indicates better interfacial adhesion between SHS-treated OPB fibers with PP matrix during blending. Overall results showed that OPF/ PP biocomposites had better properties compared to biocomposites prepared from OPMF and OPEFB, suggesting that OPF is a better OPB fiber choice as a filler in PP reinforced biocomposite.

DOI： 10.47836/pjst.28.S2.22

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85102682480&origin=inward

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