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11th International Conference on Materials and Manufacturing Technology, ICMMT 2020

作者： Eugenio, Francis Darwin T. Pajarito, Bryan B. Environmental Engineering Program University of the Philippines Diliman Quezon City Philippines Polymer Research Laboratory Department of Chemical Engineering University of the Philippines Diliman Quezon City Philippines

ISBN: (纸本)9783035737226

Iron oxides and similar inorganic compounds have served as anti-corrosion fillers for metal coatings. environmental issues related to the mining of metallic fillers have stimulated interest in alternative fillers such as organic fillers. This paper explores the use of comminuted waste plastic sachets (WPS) as an anti-corrosion filler to resin-based metal coating. Mixture design of experiment was used to study the effect of iron oxide-WPS blends on the film thickness, viscosity, corrosion behavior, and water resistance of the coating. Results show that the film thickness was affected by the presence of iron oxide while the viscosity of the coating was affected by high loads of WPS. Among all coatings, the blend containing 25% iron oxide and 75% WPS produced the highest corrosion resistance. In conclusion, comminuted WPS provided additional corrosion resistance and could serve as an alternative anti-corrosion filler. © 2021 Trans Tech Publications Ltd, Switzerland.

关键词： Additives

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Undiscovered Direct Exposure Source of Micro-Nanoplastic to the Human Eye: Disposable Eye Drops

SSRN

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SSRN 2024年

作者： Cho, Minsong Le, Yen Thi-Hoang Yoo, Hanjin Tran, Ngoc Minh Seo, Jeong-Won Jeon, Ki-Joon Department of Environmental Engineering Inha University Incheon22212 Korea Republic of Department of Ophthalmology Hallym University Dongtan Sacred Heart Hospital Hwaseong18450 Korea Republic of Program in Environmental and Polymer Engineering Inha University Incheon22212 Korea Republic of Inha University Korea Republic of

The presence and potential health effects of micro-nanoplastics (MNPs) on the human eye have emerged as significant concerns. However, the original sources and exposure pathways remain unclear. This study investigated MNPs in commercial disposable eye drops, which are considered a major direct exposure route for MNPs to the human eye. The combination of particle-based analytical techniques—surface-enhanced Raman spectroscopy and scanning electron microscopy overcomes the limitations of conventional bulk analysis methods, which struggle to detect MNPs in the small volumes typical of disposable eye drops. The maximum number concentration of MNPs was 3481 particles/mL, with a potential daily exposure of 3083 particles/day. Particles smaller than 5 μm dominated, accounting for 88% of the total particles. Raman spectroscopy and morphological analysis successfully identified the source and release mechanism of the MNPs, both freshly generated by twisting the lid and pre-existing particles. Additionally, pre-existing particles in oxygenated forms suggest a higher potential impact on ocular health. By evaluating the number concentration and characteristics of MNPs in the sequence of droplets after opening the eye drop, this study highlights a direct exposure pathway for MNPs in the human eye, underscoring the importance of single-particle characterization in accurately assessing their impact on ocular health. © 2024, The Authors. All rights reserved.

关键词： Raman spectroscopy

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A 5.3 nm giant metal-organic cage and its supramolecular gel for the formation of dye molecular ionic pairs

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Dalton Transactions 2023年第15期52卷 4980-4984页

作者： Li, Kaixiu Huang, Jian Wang, Shi-Cheng Li, Zhengguang Wang, Jun Li, Yiming Chen, Mingzhao Chan, Yi-Tsu Liu, Die Wang, Pingshan Department of Organic and Polymer Chemistry Hunan Key Laboratory of Micro & Nano Materials Interface Science College of Chemistry and Chemical Engineering Central South University Hunan 410083 Changsha China Institute of Environmental Research at Greater Bay Area Key Laboratory for Water Quality and Conservation of the Pearl River Delta Ministry of Education Guangzhou University Guangzhou510006 China Department of Chemistry National Taiwan University Taipei10617 Taiwan

A terpyridine-based supramolecular cage was successfully synthesized by the self-assembly of a hexapodal metal-organic ligand with Zn2+. This metallo-cage exhibited two large parallel planes on the top and bottom with diameters close to 6 nm and a face-to-face distance close to 3.5 nm, thus possessing a large cavity. Electrospray ionization mass spectrometry (ESI-MS), nuclear magnetic resonance (NMR), two-dimensional nuclear Overhauser (2D-NOESY), and diffusion-ordered (DOSY) spectroscopies as well as transmission electron microscopy (TEM) and atomic force microscopy (AFM) measurements, unambiguously supported the formation of a supramolecular cage. Furthermore, the corresponding metal-organic gel was felicitously prepared in CH3CN/H2O and displayed good adsorption performance for dye molecules. © 2023 The Royal Society of Chemistry.

关键词： Electrospray ionization

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Facile fabrication of hierarchical porous electrospun poly (L-lactic acid) fiber membrane via swelling-crystallization for oil adsorption

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Journal of Industrial and engineering Chemistry 2025年

作者： Bui-Vinh, Dai Kwon, Yongbum Jeong, Da-Woon Lee, Handol Department of Environmental Engineering Inha University 100 Inha-ro Michuhol-gu Incheon22212 Cuba Korea National Institute of Rare Metals Korea Institute of Industrial Technology Incheon21655 Cuba Program in Environmental and Polymer Engineering of Inha University Incheon22212 Cuba Particle Pollution Research and Management Center Incheon21999 Cuba

Electrospun biodegradable fibers have been attracting significant attention in various applications. Introducing a porous structure into these fibers enhances their surface area and thus extends their applications. Here, we report a facile route to produce a highly hierarchical porous fiber structure from biodegradable electrospun solid poly (L-lactic acid) (PLLA) fibers by acetone-induced swelling-crystallization. By controlling the concentration of acetone solution and immersion time, the highly hierarchical porous PLLA fiber membrane with a very large surface area of 138.06 m2 g−1 and a high pore volume of 0.593 cm3 g−1 was fabricated. Furthermore, we demonstrated that the porous PLLA fiber membrane presented a high oil adsorption capacity of up to 27.0 g g−1, surpassing the performance of solid electrospun PLLA fiber membranes by approximately 34 %. The highly oil-adsorptive porous PLLA fiber membrane outperformed many conventional porous materials. Therefore, the hierarchical porous PLLA fiber membrane has high potential as an eco-friendly material for high-oil adsorption applications. © 2025 The Korean Society of Industrial and engineering Chemistry

关键词： Nafion membranes

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Flexible Large-Area Graphene Films of 50-600 nm Thickness with High Carrier Mobility

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Nano-Micro Letters 2023年第9期15卷 1-14页

作者： Shiyu Luo Li Peng Yangsu Xie Xiaoxue Cao Xiao Wang Xiaoting Liu Tingting Chen Zhanpo Han Peidong Fan Haiyan Sun Ying Shen Fan Guo Yuxing Xia Kaiwen Li Xin Ming Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China School of Micro-Nanoelectronics Zhejiang UniversityZJU-Hangzhou Global Scientific and Technological Innovation CenterHangzhou 311200People’s Republic of China College of Chemistry and Environmental Engineering Shenzhen UniversityShenzhen 518055GuangdongPeople’s Republic of China Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen 518055People’s Republic of China Hangzhou Gaoxi Technol Co Ltd Hangzhou 311113People’s Republic of China

Bulk graphene nanofilms feature fast electronic and phonon transport in combination with strong light-matter interaction and thus have great potential for versatile applications,spanning from photonic,electronic,and optoelectronic devices to charge-stripping and electromagnetic shielding,***,large-area flexible close-stacked graphene nanofilms with a wide thickness range have yet to be ***,we report a polyacrylonitrile-assisted’substrate replacement’strategy to fabricate large-area free-standing graphene oxide/polyacrylonitrile nanofilms(lateral size~20 cm).Linear polyacrylonitrile chains-derived nanochannels promote the escape of gases and enable macro-assembled graphene nanofilms(nMAGs)of 50-600 nm thickness following heat treatment at 3,000℃.The uniform nMAGs exhibit 802-1,540 cm^(2)V-1s-1carrier mobility,4.3-4.7 ps carrier lifetime,and>1,581 W m^(-1)K^(-1)thermal conductivity(n MAG-assembled 10μm-thick films,mMAGs).nMAGs are highly flexible and show no structure damage even after 1.0×10^(5)cycles of ***,n MAGs broaden the detection region of graphene/silicon heterojunction from near-infrared to mid-infrared and demonstrate higher absolute electromagnetic interference(EMI)shielding effectiveness than state-of-the-art EMI materials of the same *** results are expected to lead to the broad applications of such bulk nanofilms,especially as micro/nanoelectronic and optoelectronic platforms.

关键词： Flexible large-area graphene nanofilm High carrier mobility Mid-infrared detection Electromagnetic interference shielding Heat transfer

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Advanced Flexible Carbon‑Based Current Collector for Zinc Storage

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Advanced Fiber Materials 2022年第6期4卷 1500-1510页

作者： Hao Jia Minghui Qiu Chunxia Tang Hongqi Liu Jinlin Xu Benjamin Tawiah Shou‑xiang Jiang Xiangwu Zhang Key Laboratory of Eco‑Textiles Ministry of EducationJiangnan UniversityWuxiJiangsuPeople’s Republic of China Institute of Textiles and Clothing The Hong Kong Polytechnic UniversityHong KongPeople’s Republic of China Department of Industrial Art(Textiles) Kwame Nkrumah University of Science and TechnologyKumasiGhana Fiber and Polymer Science Program Department of Textile EngineeringChemistry and ScienceWilson College of TextilesNorth Carolina State UniversityRaleighNC 27695‑8301USA

Carbon cloth(CC)-based electrodes have attracted extensive attention for next-generation wearable energy-storage devices due to their excellent electrical conductivity and mechanical ***,the application of conventional CC-based electrodes for zinc(Zn)storage severely hinders Zn ion transport and induces deleterious Zn dendrite growth,resulting in poor electrochemical ***,a novel oxygen plasma-treated carbon cloth(OPCC)is rationally designed as a current collector for flexible hybrid Zn ion supercapacitors(ZISs).The modified interface of OPCC with abundant oxygenated groups enables enhanced electrolyte wettability and uniform superficial electric field distribution.A prolonged working lifespan for Zn electrodeposition is achieved by the OPCC due to the improved interfacial kinetics and homogenized ion *** as-prepared hybrid ZIS also delivers excellent cycling endurance(98.5%capacity retention for 1500 cycles)with outstanding operation stability under various extreme *** facile surface modification strategy provides a new way for developing future flexible electrodes for wearable electronic products.

关键词： Zinc ion supercapacitor Carbon cloth Oxygen plasma treatment Interface kinetics

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Methylene blue (MB) removal from aqueous solution by alum;catalytic ozonation process

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Discover Chemical engineering 2024年第1期4卷 1-17页

作者： Ikhlaq, Amir Parveen, Sehrish Raashid, Muhammad Masood, Zafar Rizvi, Osama Shaheen Al Johani, Thamer Abdulhameed Ahsan, Muffakir Amjad, Hadeeqa Qi, Fei Institute of Environmental Engineering and Research (IEER) University of Engineering and Technology (UET) Lahore Pakistan Department of Chemical Polymer and Composite Materials Engineering University of Engineering and Technology Lahore New Campus Lahore Pakistan Department of Chemistry and Chemical Engineering Syed Babar Ali School of Science & Engineering (SBASSE) Lahore University of Management Sciences (LUMS) Lahore Pakistan Environmental Protection and Control Department Royal Commission Jazan Jazan Saudi Arabia Saudi Arabian Parsons Limited Madinah Saudi Arabia Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and Engineering Beijing Forestry University Beijing People’s Republic of China

Textile wastewater is among the most polluted types of industrial waste. Wastewater treatment in the textile industry is notoriously difficult because of the use of complex chemicals and dyes in the textile production steps, and conventional methods are not enough to treat these. Textile wastewater, known for its high pollution levels, poses challenges for treatment due to complex chemicals and dyes. A comparative study was conducted on simple ozonation and catalytic ozonation (CO) using alum to degrade methylene blue (MB). The authors analyzed various factors like time, pH, catalyst loading and ozone dosages during the study. Results showed that catalytic activity in ozonation depends on pH and ozone flow. The maximum MB elimination was achieved at pH 6.6 and 200 V ozone flow. Scanning electron microscopy (SEM) was used to characterize the surface morphology of the catalyst, Fourier transform infrared spectroscopy (FTIR) was used to identify the important functional groups, and energy dispersive X-ray spectroscopy (EDS) was used to characterize the catalyst's elemental composition. Compared to simple ozonation, CO showed higher removal in the initial phase. Real textile wastewater analysis confirmed the effectiveness of alum catalysts in achieving significant removal of MB (87%) through this novel cost-efficient process.

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Structure–Property Relationships of Epoxidized Natural Rubber Vulcanizates

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Journal of Macromolecular science, Part B: Physics 2022年第12期61卷 1517-1534页

作者： Hayeemasae, Nabil Soontaranon, Siriwat Thainiramit, Panu Masa, Abdulhakim Department of Rubber Technology and Polymer Science Faculty of Science and Technology Prince of Songkla University Pattani Campus Pattani Thailand Faculty of Science and Technology Prince of Songkla University Pattani Campus Pattani Thailand Synchrotron Light Research Institute Nakhon Ratchasima Thailand Faculty of Science Prince of Songkla University Songkhla Thailand Rubber Engineering and Technology Program International College Prince of Songkla University Songkhla Thailand

The effects of epoxide content on the microstructure and characteristics of epoxidized natural rubber (ENR) were examined. Self-crosslinking between epoxide groups possibly occurred during the vulcanization, with C–O–C linkages in the ENR. Depending on the epoxide level, the self-crosslinking in ENR improved the maximum torque, overall crosslink density (CD) and stability at elevated temperature of the rubber. With increasing epoxide content, the moduli and tensile strengthes of the ENR also increased. The highest tensile strength was achieved at 25 mol% epoxide, exceeding that of crosslinked NR by 46%. The self-crosslinking also facilitated strain-induced crystallization (SIC), reducing the onset strain of crystallization and increasing the degree of crystallinity. Even though increased epoxide content in the NR made the crosslink network distribution less homogeneous, the CD increased so much that the thermomechanical and mechanical characteristics of ENR were improved. The C–O–C linkages from ENR self-crosslinking were also sufficient to boost the thermal stability, complementing the conventional sulfide links. © 2023 Taylor & Francis Group, LLC.

关键词： Rubber

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Tailoring Molecular Interaction in Heteronetwork polymer Electrolytes for Stretchable, High-Voltage Fiber Supercapacitors

SSRN

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SSRN 2022年

作者： Handayani, Puji Lestari Kim, Taehoon Song, Yeon Hwa Park, Jae Seo Yang, Seung Jae Choi, U. Hyeok Department of Polymer Science and Engineering and Program in Environmental and Polymer Engineering Inha University Incheon22212 Korea Republic of Changwon51508 Korea Republic of Department of Polymer Engineering Pukyong National University Busan48513 Korea Republic of Department of Chemistry and Chemical Engineering Education and Research Center for Smart Energy and Materials Inha University Incheon22212 Korea Republic of

Mechanically and electrochemically stable all-solid-state supercapacitors are of great interest in the field of wearable and portable electronic devices. However, when conventional liquid or gel electrolytes are used in supercapacitors, their discontinuous functions appear in harsh external environments. Here, we prepare freeze-tolerant heteronetwork nanohybrid polymer electrolytes (NPEs), composed of hydrophilic poly(lithium acrylate) (PLiA) containing mobile lithium countercations and mechanically robust silica nanoparticles (SNs) serving as stress buffers, via sol-gel reaction and radical polymerization. The combination of PLiA and SN provides NPE (PLiA-SN) with high room temperature ionic conductivity, remaining 100% even after 700% elongation, as well as exhibiting high ionic conductivity at low temperatures. The cross-linking of SNs with PLiA also gives the resultant NPE superelasticity and self-healing property. The optimized NPE is assembled with metal-organic framework derived carbon-coated CNTY hybrid electrodes to fabricate high-performance all-solid-state fiber supercapacitors (FSCs). The assembled FSC delivers a high specific capacitance, high power and energy densities, as well as a wide operating voltage window. Moreover, the electrochemical performance of the FSC is maintained under varying stretching strains and degrees of bending, and still retains capacity even at a low temperature, demonstrating excellent mechanical, thermal, and electrochemical stability. © 2022, The Authors. All rights reserved.

关键词： Supercapacitor

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Tailoring Ion Dynamics in Energy Storage Conductors for Ultra-Stable, High-Performance Solid-State Microsupercapacitor Array

SSRN

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SSRN 2023年

作者： Lee, Dawoon Park, Gaeun Kim, Youngoh Choi, Joonmyung Choi, U. Hyeok Kim, Jaekyun Department of Photonics and Nanoelectronics Hanyang University Ansan15588 Korea Republic of Department of Mechanical Design Engineering Hanyang University Seoul04763 Korea Republic of Department of Mechanical Engineering Hanyang University Ansan15588 Korea Republic of Department of Polymer Science and Engineering Program in Environmental and Polymer Engineering Inha University Incheon22212 Korea Republic of BK21 FOUR ERICA-ACE Center Hanyang University Ansan15588 Korea Republic of

All-solid-state electrochemical energy storage (EES) devices with prolonged lifetime, operational stability, and mechanical flexibility can be a promising route to powering up wearable electronics. However, conventional EES devices have been often hindered by a gradual decrease in energy capacity due to low ionic conducting electrolytes, non-suitable electrode materials, or poor electrode/electrolyte interfaces. Herein, we propose a harmonization of the molecular-level tailoring of ionic gel polymer electrolyte (IGPE) and graphene-based electrodes, significantly improving and sustaining the electrochemical performance (11.9 μWh cm-2) of EES microsupercapacitor (MSC) devices. Our optimized MSC device based on ethyl-3-methylimidazolium bis(fluorosulfonyl)imide (EMIM-FSI) and interdigitated reduced-graphene oxide (rGO) electrode array maintains 99 % of the initial electrochemical capacity even after 20,000 cycles, also demonstrating the excellent mechanical flexibility (bending radius up to 4 mm) and environmental stability (>30 days) of the MSC-based array. Molecular-level simulation and spectroscopic atomic analysis revealed noticeably lower residual ionic liquid (IL) molecules of EMIM-FSI, compared to EMIM-trifluoromethyl FSI, between the graphene-based layers of electrodes during the charge/discharge cycles. Therefore, our optimization strategy and findings will pave the way to accomplish next-generation of all-solid-state EES devices with ultra-high operational stability, powering wearable electronics. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

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