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Effect of Concentration and Residence Time of Joncryl■ADR4368 on Melt Processability of Poly(3-hydroxybutyrate)

Journal of Renewable Materials 2024年第12期12卷 2079-2094页

作者： Jéssica da Silva Chagas JoséElson Soares Filho Natália Fernanda Inocêncio Silva Marcelo Massayoshi Ueki Eliton Souto de Medeiros Renate Maria Ramos Wellen Mauricio Pinheiro de Oliveira Gelsoneide da Silva Gois Yêda Medeiros Bastos de Almeida Amélia S.F.Santos Post-Graduation Program in Materials Engineering(PPCEM) Federal University of Paraíba(UFPB)João PessoaPB 58051-900Brazil Laboratory of Materials and Biosystems(LAMAB) Federal University of Paraíba(UFPB)João PessoaPB 58051-900Brazil Department of Materials Engineering Federal University of Sergipe(UFS)Jardim Rosa ElzeSão CristóvãoSE 49100-000Brazil Institute of Science and Technology Federal University of São Paulo(UNIFESP)São Josédos CamposSP 12231-280Brazil Department of Chemical Engineering Federal University of Pernambuco(UFPE)Cidade UniversitáriaRecifePE 50670-901Brazil

Poly(3-hydroxybutyrate)(PHB)is a biothechnological and biodegradable thermoplastic polymer from the polyhydroxyalkanoates(PHAs)family,whose chain regularity,high molecular weight,and physical and mechanical properties comparable to polypropylene(PP)are characteristics that have made PHB a prominent commercial ***,its susceptibility to thermal degradation and hydrolysis has limited many *** address the challenges associated with processing,a random copolymer of 95.86 mol%3-hydroxybutyrate and 4.14 mol%3-hydroxyvalerate(referred as PHB)was compounded without(neat PHB)and with 0.25,0.5,1,and 1.5 wt%of chain extender(Joncryl■ADR 4368),consisting of multifunctional epoxy groups,and melt mixed in an internal mixer at 170℃,50 rpm,and residence times of 5,10,and 15 *** effect of chain extender concentration and residence time on the effectiveness of Joncryl■ADR 4368 to recover the pristine PHB properties were investigated through torque rheometry,melt flow index(MFI),differential scanning calorimetry(DSC),tensile testing,and thermogravimetric *** results indicated that an increase in residence time strongly influenced the prevalence of thermomechanical degradation reactions over chain extension reactions of PHB during processing in the molten *** residence times favored chain extension,while longer times favored chain *** trend led to no enhancement of PHB mechanical properties processed for 10 and 15 min,regardless of additive content *** flow index,thermogravimetric analysis and tensile strength exhibited an asymptotic behavior with the increase in additive concentration,exhibiting a noteworthy improvement in tensile strength and temperature at the highest rate of thermal degradation(TMAX),and a decrease in melt flow index of neat PHB with only 0.25 wt%of additive mixed for 5 *** results found in this work allow additional data for processing PHB by manipulating the ratios of multifunctional chain

关键词： PHB chain extender degradation epoxy groups viscosity

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Electrochemical Performance of a Water-Based LiFePO4 Cathode for Li-Ion Batteries

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Defect and Diffusion Forum 2022年 417卷 163-168页

作者： Chanhaew, Araya Aranmala, Komsak Darmawan, Luthfi Mursid Nisa, Shofirul Sholikhatun Nurohmah, Anisa Raditya Meethong, Nonglak Materials Science and Nanotechnology Program Department of Physics Faculty of Science Khon Kaen University Muang District Khon Kaen40002 Thailand Department of Chemical Engineering Faculty of Engineering Universitas Sebelas Maret Central Java Surakarta57126 Indonesia Centre of Excellence for Electrical Energy Storage Technology Universitas Sebelas Maret Central Java Surakarta57146 Indonesia Khon Kaen University Muang District Khon Kaen40002 Thailand

Lithium iron phosphate (LiFePO4) has received much attention because it can provide high power density, abundant raw materials, safety, low toxicity, and high thermal stability. In general, the production of LiFePO4 cathode uses Polyvinylidene fluoride (PVDF) as a binder and N-Methyl-2-Pyrrolidone (NMP) as a solvent. These components are expensive, toxic, and can affect the environment. Therefore, to cover this shortcoming, the solvent and binder were replaced in this study. The solvent is replaced with water, which is more environmentally friendly and abundant, while the binder is replaced with water soluble binders. Suitable electrode formulations were investigated to obtain high performance cylindrical typed Li-ion batteries. As a result, Formula B (ratio of LiFePO4: AB: KS6: SBR: CMC = 90: 3: 3: 2.677: 1.333) has the highest specific discharge capacity of 120 mAh/g. The NMP-based cathode can give about 145 mAh/g. Therefore, the water-based cathode LiFePO4 gives a value that is slightly lower the NMP-based formular. © 2022 Trans Tech Publications Ltd, Switzerland.

关键词： Lithium compounds

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pH/GSH dual responsive nanosystem for nitric oxide generation enhanced type I photodynamic therapy

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Bioactive Materials 2024年第4期34卷 414-421页

作者： Jianhua Zou Zheng Li Yang Zhu Yucen Tao Qing You Fangfang Cao Qinghe Wu Min Wu Junjie Cheng Jianwei Zhu Xiaoyuan Chen Departments of Diagnostic Radiology SurgeryChemical and Biomolecular Engineeringand Biomedical EngineeringYong Loo Lin School of Medicine and College of Design and EngineeringNational University of SingaporeSingapore119074Singapore Nanomedicine Translational Research Program NUS Center for NanomedicineYong Loo Lin School of MedicineNational University of SingaporeSingapore117597Singapore Clinical Imaging Research Centre Centre for Translational MedicineYong Loo Lin School of MedicineNational University of SingaporeSingapore117599Singapore Institute of Molecular and Cell Biology Agency for ScienceTechnologyand Research(A*STAR)61 Biopolis DriveProteosSingapore138673Singapore Department of Plastic and Reconstructive Surgery Shanghai Ninth People’s HospitalShanghai Jiaotong UniversityShanghai200011PR China Department of Chemistry Center for Bioanalytical Chemistry University of Science and Technology of ChinaHefei230026PR China College of Life Science Nanjing Normal University1 Wenyuan RoadNanjing210023PR China

Tumor hypoxia diminishes the effectiveness of traditional type II photodynamic therapy(PDT)due to oxygen *** I PDT,which can operate independently of oxygen,is a viable option for treating hypoxic *** this study,we have designed and synthesized JSK@PEG-IR820 NPs that are responsive to the tumor microenvironment(TME)to enhance type I PDT through glutathione(GSH)*** approach aims to expand the sources of therapeutic benefits by promoting the generation of superoxide radicals(O_(2)^(-).)while minimizing their *** diisopropyl group within PEG-IR820 serves a dual purpose:it functions as a pH sensor for the disassembly of the NPs to release JSK and enhances intermolecular electron transfer to IR820,facilitating efficient O_(2)^(-).***,the release of JSK leads to GSH depletion,resulting in the generation of nitric oxide(NO).This,in turn,contributes to the formation of highly cytotoxic peroxynitrite(ONOO^(-).),thereby enhancing the therapeutic efficacy of these ***-II fluorescence imaging guided therapy has achieved successful tumor eradication with the assistance of laser therapy.

关键词： TME responsive NO gas therapy NIR-II imaging Type I PDT

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Three-dimensional printing of graphene-based materials for energy storage and conversion

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SusMat 2021年第3期1卷 304-323页

作者： Yanqiu Jiang Fan Guo Yingjun Liu Zhen Xu Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang UniversityHangzhouP.R.China State Key Lab of Chemical Engineering College of Chemical and Biological EngineeringZhejiang UniversityHangzhouP.R.China National Special Superfine Powder Engineering Research Center Nanjing University of Science and TechnologyNanjingP.R.China

Developing high-performance energy storage and conversion(ESC)device relies on both the utilization of good constituent materials and rational design of assembly ***-based materials,due to their superior properties like high electrical/thermal conductivity,large surface area,and unique optical properties,have been extensively reported for ESC *** emerging three-dimensional(3D)printing techniques,especially extrusion-based direct ink writing technique,have brought a revolutionary improvement in structure control accuracy and designing capability to graphene-based macro-assemblies,triggering a boost in functionalities and performances of graphene-based ESC *** these circumstances,understanding the very recent progress of 3Dprinted graphene materials and their design philosophy to bring new concepts for material designs and address the requirements for high-performance ESC devices are urgently *** this review,we aim to outline recent developments in 3D printing of graphene-based materials and their applications in ESC *** requirements and theoretical analysis for preparation printable inks are discussed,as well as feasible GO ink preparation strategies in existing *** representative explorations of 3D-printed graphenematerials in ESC applications like batteries,supercapacitors,solar steam generators,and electro-thermal conversion are also *** study attempts to provide a comprehensive overview of the progresses and limitations of present 3D printed graphenematerials,and seeks to enlighten the opportunities and orientations of future research in this field.

关键词： 3D printing direct ink writing energy storage and conversion graphene

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Methylene Blue Removal on Biodegradable Adsorptive Membranes Fabricated From Sugarcane Bagasse Pulp: Characterization and Performance Study

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macromolecular Symposia 2024年第2期413卷 2300088-2300088页

作者： Elshabrawy, Salma O. M. Elhussieny, Amal Taha, Mahmoud M. Konsowa, Abdelaziz H. Fahim, Irene S. Smart Engineering Systems Research Center Nile University Juhayna Square Giza El Sheikh Zayed Egypt Chemical Engineering Department Faculty of Engineering Alexandria University Alexandria21544 Egypt Environmental Engineering Program Zewail City of Science and Technology University of Science and Technology October Gardens 6th of October Giza12578 Egypt

Dye-containing waste should be carefully treated using environmentally friendly technology to prevent environmental harm and preserve water resources. Adsorptive membranes are a promising new approach for decreasing, recovering, and reusing waste while also removing contaminants like dyes. In this work, two different techniques are employed to create membranes using sugarcane bagasse pulp and carbon from charcoal. In the first technique, the surface of sugarcane bagasse is coated with charcoal paste as shown in Figure 1, while in the second, the carbon is combined with sugarcane bagasse pulp particles before being formed into sheets. It is discovered that the manufactured membranes has micron-sized pores. It is discovered that the mixed-fabricated membrane has a 99.4% better efficiency than the coated one. The membranes' surfaces are characterized using FTIR and SEM analysis. © 2024 Wiley-VCH GmbH.

关键词： Charcoal

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Effects of carbon dioxide concentration and swine wastewater on the cultivation of Chlorella vulgaris FSP-E and bioethanol production from microalgae biomass

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Applied Energy 2024年 369卷

作者： Condor, Billriz E. de Luna, Mark Daniel G. Lacson, Carl Francis Z. Acebu, Paula Isabel G. Abarca, Ralf Ruffel M. Nagarajan, Dillirani Lee, Duu-Jong Chang, Jo-Shu Energy Engineering Program National Graduate School of Engineering University of the Philippines Diliman Quezon City Philippines Quezon City1101 Philippines Department of Chemical Engineering University of the Philippines Diliman Quezon City1101 Philippines Center of Excellence in Environmental Catalysis and Adsorption Thammasat University Pathum Thani12121 Thailand Department of Chemical Engineering and Technology Mindanao State University-Iligan Institute of Technology Iligan City9200 Philippines College of Hydrosphere Science Institute of Aquatic Science and Technology National Kaohsiung University of Science and Technology Kaohsiung City811532 Taiwan Department of Mechanical Engineering City University of Hong Kong Kowloon Tang Hong Kong Department of Chemical and Materials Engineering Tunghai University 407 Taiwan Research Center for Smart Sustainable Circular Economy Tunghai University Taichung407 Taiwan Department of Chemical Engineering National Cheng Kung University Tainan701 Taiwan Department of Chemical Engineering and Materials Science Yuan Ze University Chung-Li Taiwan

The study investigated the potential of wastewater-derived microalgae as a cost-effective feedstock for bioethanol production. The influence of CO2 loading, use of swine wastewater as a nutrient source, effect of micronutrients in the cultivation media, and scale-up of Chlorella vulgaris FSP-E was conducted. Results showed that 2% CO2, 25% swine wastewater, 500 mg/L sodium nitrate, 40 mg/L K2HPO4, 75 mg/L MgSO4, and 6 mg/L citric acid were optimal for maximal biomass production, nitrate removal, and carbohydrate accumulation in BG-11 medium. The maximum biomass and carbohydrate content obtained in this study were 35-fold and 60%, respectively. Scaling up to 5 L volume was challenging due to illumination, aeration, and mixing issues. The obtained carbohydrate-rich biomass was subjected to mild sulfuric acid hydrolysis and subsequently used for bioethanol fermentation. The hydrolysate was composed solely of glucose and galactose and was converted into bioethanol within 8 h by Saccharomyces cerevisiae with an ethanol yield of 0.22 ± 0.01 g ethanol per g biomass. Further exploration of effective lighting and mixing strategies are recommended to realize economically viable microalgal biofuels. © 2024 Elsevier Ltd

关键词： Biomass

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Flow-Driven Translocation of Polymer Vesicle Through a Nanochannel

SSRN

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SSRN 2024年

作者： Qi, Huanli Li, Luyang Ding, Mingming Li, Weihua School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou510006 China State Key Laboratory of Molecular Engineering of Polymers Key Laboratory of Computational Physical Sciences Department of Macromolecular Science Fudan University Shanghai200433 China Jieyang Branch of Chemistry and Chemical Engineering Guangdong Laboratory Jieyang515200 China

Flow-driven translocation of a polymer vesicle self-assembled from amphiphilic diblock copolymers through a nanochannel is studied using hybrid LatticeBoltzmann Molecular Dynamics simulations. Three translocation modes are discovered: a single vesicle, small vesicles, and tiny micelles in sequence, respectively, as the width of the nanochannel is decreased, which is confirmed by the self-consistent field theory calculations. Accordingly, spherical vesicles, ellipsoidal vesicles, and worm-like micelles are formed sequentially after crossing the nanochannel. More importantly, we find that the critical flow rate monotonically decreases as the ratio of the polymer vesicle size and the width of the nanochannel decreases until it approaches 1. Our results provide a basis for characterizing the stability of vesicles or sorting vesicles with different sizes and also point to a new idea of regulating spherical vesicles to ellipsoidal vesicles or worm-like micelles. © 2024, The Authors. All rights reserved.

关键词： Micelles

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Improving self-healing characteristics of polyurethane composite coatings by surface modification of polyaniline using dodecylamine

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engineering Failure Analysis 2025年 176卷

作者： Ahmad, Shoaib Nawaz, Muddasir Mohammad, Solaiman Al-Qahtani, Noora Kahraman, Ramazan Mansoor, Bilal Shakoor, R.A. Qatar University Doha2713 Qatar Materials Science & Technology Program College of Arts & Sciences Qatar University Doha2713 Qatar Department of Mechanical and Industrial Engineering Qatar University Doha2713 Qatar Department of Chemical Engineering College of Engineering Qatar University Doha2713 Qatar Qatar University Doha2713 Qatar Department of Materials Science and Engineering Texas A&M University College Station United States

Corrosion is one of the most critical problems affecting the structural integrity of metals. Polymeric nanocomposite coatings reinforced with anti-corrosive pigments are currently being used to mitigate corrosion. This study involves the synthesis of polyaniline (PANI) nanoparticles and their modification with dodecylamine (DOC), which functions as a corrosion inhibitor. Polyurethane coatings (PU-PANI@DOC) were developed by incorporating modified nanoparticles (PANI@DOC) into the polyurethane matrix, and blank polyurethane coatings (PU-blank) were prepared without any nanoparticles. Fourier-transform infrared spectroscopy (FTIR), Transmission electron microscopy, and Scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM/EDX) analysis confirmed the successful modification of dodecylamine (DOC) with the surface of polyaniline (PANI) nanoparticles. The electrochemical impedance spectroscopy (EIS) and salt spray test (SST) revealed that the impedance values of the modified coating follow an inclined trend (1010 Ω.cm2) in comparison with PU-blank coatings (107 Ω.cm2) after the 14th day of immersion in 3.5 wt% NaCl. Moreover, the hydrophobic characteristics of PANI@DOC nanoparticles shift the contact angle from 60° to 90°, thus lowering the wettability nature of modified coatings. Overall, Polyurethane coatings (PU-PANI@DOC) exhibiting potential attributes such as barrier properties, hydrophobic nature, inhibition effect, and high compatibility with polyurethane matrix can be a suitable material for the development of smart self-healing coatings to protect the metals from the hostile effects of corrosion. © 2025 Elsevier Ltd

关键词： Fourier transform infrared spectroscopy

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Hydrogen production by steam reforming of fusel oil over Ni-based fiber catalyst

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Materials Today: Proceedings 2022年 57卷 1147-1153页

作者： Le-Mai, T.H. Mhadmhan, S. Trieu, T.Q. Prasongthum, N. Suriya, P. Reubroycharoen, P. Department of Chemical Technology Faculty of Science Chulalongkorn University Bangkok10330 Thailand Center of Excellence on Petrochemical and Materials Technology Chulalongkorn University Research Building Bangkok10330 Thailand Program of Petrochemistry Faculty of Chemical Engineering Industrial University of Ho Chi Minh City 70000 Viet Nam Pathum Thani12120 Thailand

This research aimed to evaluate the fusel oil steam reforming over Ni/carbon nanotubes-silica fiber (Ni/CNTs-SF) catalysts prepared by impregnation method with 10 wt% of Ni loading. CNTs-SF was synthesized by chemical vapor deposition (CVD) using ethanol as a source for CNTs over steam reforming. The prepared catalysts were analyzed by BET, XRD, TEM, FESEM-EDS, Raman, and TG/DTG. Ni/CNTs-SF catalyst was tested for fusel oil steam reforming and compared with Ni supported on conventional silica such as a silica fiber (SF) and a silica porous (SP) at the same loading. The results found that Ni/CNTs-SF catalyst showed better catalytic activity and stability than Ni/SF and Ni/SP. TGA profile of the catalysts after fusel oil steam reforming showed that the severe carbon deposited over Ni/SP at 64% (wt%), while at 31% was found over Ni/CNTs-SF catalyst and Ni/SF catalyst. In addition, Ni/CNTs-SF catalyst exhibited the highest hydrogen yield at 15%, and Ni/SF and Ni/SP catalysts gave a lower yield of hydrogen at 11% and 7%, respectively. © 2021

关键词： Carbon nanotubes

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Evaluating A Continuous Liquid-phase Plasma Discharge Process for Destroying PFAS in Water

Evaluating A Continuous Liquid-phase Plasma Discharge Proces...

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2024 American Society of Agricultural and Biological Engineers Annual International Meeting, ASABE 2024

作者： Nasir, Alia Rivera, Celiannie Agyekum-Oduro, Ekow Siqab, Sidra Mohotti, Dinithi Deng, Shaobo Wu, Sarah Department of Chemical and Biological Engineering University of Idaho MoscowID83844 United States Environmental Science Program University of Idaho MoscowID83844 United States Southern Research and Outreach Center University of Minnesota 35838 120th ST WasecaMN56093 United States

ISBN: (纸本)9798331302214

Due to the lack of effective conventional treatment techniques for removing and destroying PFAS, non-thermal plasma technology has come to the center stage, but with limitations. In this study, a novel, continuous-flow, liquid-phase plasma discharge (CLPD) process was established and evaluated for its effectiveness and efficiency in removing PFOA in water. Experiments were carried out in two phases. In phase I, two carrier gases (argon and air) were studied and compared for their performance in removing PFOA by CLPD, and argon gas was found to be more effective than air (91.75% for argon vs. 79.55% for air). Then in Phase II, Argon was used as the carrier gas to evaluate other operating parameters including gas flow rate, water flow rate, water conductivity, and power applied using a two-level partial factorial design. The results showed that gas flow rate was the most significant factor among the four factors affecting the removal efficiency of PFOA by CLPD (p = 0.0029). The best combination of the four operating parameters was obtained (conductivity = 300 µs/cm, water flow rate = 150 mL/min, gas flow rate = 1.5 sL/min, and power = 100 W), under which the CFLPPD could achieve a PFOA removal rate of 93.4%. The breakdown pathway was estimated to be from PFOA to PFHPA, to PFHXA, to PFHeA, to PFBA, and then to H2O, CO2, F, and short-chain organics. Based on the results from this study, it may be concluded that the CLPD process evaluated in this project can be developed into an effective treatment to remove PFAS in contaminated water. © 2024 ASABE Annual International Meeting. All rights reserved.

关键词： Flow of gases

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