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SSRN 2024年

作者： Zhong, Yuan Zhang, Yingpeng Liu, Zhihao Ramachandran, Chidambaram Seshadri Cha, Limei Wang, Qun College of Materials Science and Engineering Hunan University Hunan Changsha410082 China The Material Science and Engineering Program Guangdong Technion Israel Institute of Technology Shantou515063 China Department of Materials Science and Engineering The State University of New York Stony BrookNY11794 2275 United States

This work systematically investigated the microstructure and interfacial characteristics of cold sprayed (CS) 2024Al coating on 2024Al-T3 substrate. Within the internal structure of the layer, recrystallization processes induced by intense stress were seen, resulting in the formation of nanograins with sizes ranging from 30-100 nm, as well as ultrafine grains with sizes ranging from 100-300 nm. Different bonding modes of splat/splat, including mechanical bonding, mechanical interlocking, and metallurgical bonding, have been found at the interface between splat/substrate. There were no apparent pores and gaps between the particles in the mechanical bonding area and between the coating and the substrate. In regions of metallurgical bonding, adiabatic shear instability promoted the occurrence of continuous dynamic recrystallization (CDRX) on the one hand, leading to viscous flow of local materials, which damaged the original splat/substrate bonding surface and generating new bonding surfaces, on the other hand, promoted atomic diffusion between the coating and the substrate, allowing a close lattice match formed at the splat/substrate interface. Therefore, the CS 2024Al coating exhibited excellent comprehensive properties with a porosity level of 0.31±0.09%, a hardness of 143.4 HV0.025, and an adhesion/cohesion strength exceeding 55.5 MPa. These properties were derived from the strong bonding among splats and between the splats and the substrate. © 2024, The Authors. All rights reserved.

关键词： Shear flow

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Structural and thermal analysis of bio-based polybenzoxazine derived from liquefied empty fruit bunch (EFB) via solventless method 3

Structural and thermal analysis of bio-based polybenzoxazine...

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3rd Symposium on Industrial science and technology, SISTEC 2021

作者： Rohimi, Nurfatin Farhanah Yaakob, Muhd Nor Arifin Roslan, Rasidi Salim, Nurjannah Mustapha, Siti Noor Hidayah Rahim, Mohd Hasbi Ab Chia, Chin-Hua Zakaria, Sarani Advanced Material Group Faculty of Industrial Sciences and Technology Universiti Malaysia Pahang Pahang Kuantan Gambang26300 Malaysia Bioresources and Biorefinery Laboratory Materials Science Program Faculty of Science and Technology Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia

A bio-based polybenzoxazine demonstrating excellent thermal properties was synthesized using phenolic and its derivatives derived from liquefaction of empty fruit bunch (EFB) fibres to fulfill green chemistry principles. The liquefied EFB was reacted with furfurylamine and paraformaldehyde through a Mannich condensation reaction. For comparison purposes, a guaiacol polybenzoxazine was synthesized using guaiacol as a phenolic component reacted with similar amine and aldehyde. Both types of polybenzoxazine synthesized from liquefied EFB and guaiacol were named L-fa and G-fa, respectively. The structural analysis was performed using Fourier-Transform Infrared (FTIR) and proton Nuclear Magnetic Resonance (1H NMR). It was observed that the synthesis of benzoxazine groups for both types of polybenzoxazine was successful with the formation of the oxazine ring. Thermal stability showed that liquefied EFB polybenzoxazine (L-fa) has higher thermal stability above 360 °C compared to guaiacol-polybenzoxazine (G-fa), which is higher is 280 °C due to the complex structure of the lignin derivative in the liquefied EFB. For polymerization behavior, L-fa exhibit two exothermic peaks compared to three peaks on G-fa, indicating that L-fa is more reactive due to additional polymerizable sites present in L-fa. This work widens the synthesis route for the preparation of bio-based benzoxazine derived from oil palm waste which will perpetuate outstanding evolution towards the sustainable development of the bio-based polymeric industry. Copyright © 2021 Elsevier Ltd. All rights reserved.

关键词： Condensation reactions

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Synergetic effects of multiple junction and surface hydroxyl in Cu/CuO/Cu2O/TiO2 heterostructures towards highly efficient photocatalysts for hydrogen generation

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materials science for Energy Technologies 2025年 8卷 131-142页

作者： Subagyo, Riki Anindika, Garcelina Rizky Aufkani, Afif Akmal Zhang, Lei Ardhyananta, Hosta Burhan, R.Y. Perry Nugraheni, Zjahra Vianita Akhlus, Syafsir Bahruji, Hasliza Prasetyoko, Didik Wellia, Diana Vanda Ivansyah, Atthar Luqman Arramel Kusumawati, Yuly Department of Chemistry Faculty of Science and Analytic Data Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Center of Excellence Applied Physics and Chemistry Nano Center Indonesia Jl PUSPIPTEK South Tangerang Banten15314 Indonesia Department of Physics National University of Singapore Singapore117551 Singapore Department of Materials and Metallurgical Engineering Faculty of Industrial Technology and Systems Engineering Institut Teknologi Sepuluh Nopember Surabaya60111 Indonesia Centre of Advanced Material and Energy Science Universiti Brunei Darussalam Jalan Tungku Link BE 1410 Brunei Department of Chemistry Faculty of Mathematics and Natural Sciences Universitas Andalas Padang25163 Indonesia Master Program in Computational Science Faculty of Mathematics and Natural Science Institut Teknologi Bandung Jalan Ganesha No. 10 Bandung40132 Indonesia Instrumentation and Computational Physics Research Group Department of Physics Faculty of Mathematics and Natural Sciences Institut Teknologi Bandung Jalan Ganesha No.10 West Java Bandung40132 Indonesia

The implementation of titanium dioxide (TiO2) as a photocatalyst material in hydrogen (H2) evolution reaction (HER) has embarked renewed interest in the past decade. Rapid electron-hole pairs recombination and wide band gap of a photo-sensitive material of TiO2 are detrimental toward the targeted catalytical reaction. In this study, we present the rational design, fabrication, photocatalytic performance of TiO2-Cu/CuO/Cu2O heterostructures (CuTi) using viable chemical reduction method. The Z-scheme and S-scheme are succesfully generated across the TiO2/CuO/Cu2O interfaces, while the Schottky junction arises on the Cu perimeters. This is evidenced from the blue shifted about 0.3 eV of Cu 2p core level determined by using X-ray photoemission spectroscopy (XPS), in combination with the formation of inverse V-shape of the Mott-Schottky plots. In addition, we find that Cu/CuO/Cu2O facilitates photon absorption range up to the visible region. The multiple heterojunction and the large number of OHsurface enhanced charge carrier transfer are associated to the suppression of photoluminescence (PL) intensity, high surface hydroxyl (OHsurface) density in CuTi probed by XPS, and fast electron transfer based on the electrochemical measurements. The presence of OHsurface inhibits the recombination of electron. A significant H2 photogeneration rate enhancement is achieved when an optimized 5 wt% Cu/CuO/Cu2O concentration is used on TiO2 to achieve 7,157.19 μmol·g−1 (1,789.30 μmol·g−1·h−1). Based on this finding, zero emission energy innitiative could be materialized under multiple heterojunctions in photocatalytic process is beneficial for enhancing the H2 production. © 2025 The Authors

关键词： Titanium dioxide

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Enhancing the Electrical Performance of Solid Oxide Fuel Cell Cathodes Through Controlled Calcination Temperature of La0.3sr0.7ti0.3fe0.7o3-D

SSRN

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SSRN 2024年

作者： Bin Ahmad, Muhammad Zaid Ahmad, Sahrim Haji Chen, Ruey Shan Ismail, Aznan Fazli Baharuddin, Nurul Akidah Hazan, Roshasnorlyza Department of Applied Physics Faculty of Science and Technology Universiti Kebangsaan Malaysia Selangor Darul Ehsan Bangi43600 Malaysia Nuclear Science Program Faculty of Science and Technology Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Solid Oxide Fuel Cell Fuel Cell Institute Universiti Kebangsaan Malaysia Selangor Bangi43600 Malaysia Material Technology Group Industrial Technology Division Malaysian Nuclear Agency Kajang Selangor Bangi43000 Malaysia

This study investigates the effect of calcination temperature on the electrical performance of lanthanum strontium titanate ferrite (LSTF) as a solid oxide fuel cell (SOFC) cathode material. The LSTF precursor was calcined at temperatures ranging from 900°C to 1200°C and transformed into inks, which were then applied on both sides of YSZ pellet to form a symmetrical cell. The TGA results revealed that a minimum temperature of 900°C was required to obtain the final product, and the calcination process showed three stages of decomposition. XRD analysis on LSTF powders showed similar peaks to those in previous literature, but traces of precursor peaks were observed in the samples calcined at 900°C and 1000°C, indicating incomplete transformation. EIS was used to measure the electrical performance of the LSTF cathode material. The results showed that the optimum calcination temperature was 1100°C, which resulted in the lowest polarisation resistance (Rp). Lower calcination temperatures led to incomplete transformation, which caused an increase in Rp. Conversely, higher calcination temperatures produced larger crystallite sizes, leading to a higher Rp. A buffer layer and a current-collecting layer are added to further enhance the electrical performance of the LSTF symmetrical cell. © 2024, The Authors. All rights reserved.

关键词： Strontium titanates

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Structural and thermal analysis of bio-based polybenzoxazine derived from liquefied empty fruit bunch (EFB) via solventless method

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materials Today: Proceedings 2022年 51卷 1367-1371页

作者： Nurfatin Farhanah Rohimi Muhd Nor Arifin Yaakob Rasidi Roslan Nurjannah Salim Siti Noor Hidayah Mustapha Mohd Hasbi Ab. Rahim Chin-Hua Chia Sarani Zakaria Advanced Material Group Faculty of Industrial Sciences and Technology Universiti Malaysia Pahang 26300 Gambang Kuantan Pahang Malaysia Bioresources and Biorefinery Laboratory Materials Science Program Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia

A bio-based polybenzoxazine demonstrating excellent thermal properties was synthesized using phenolic and its derivatives derived from liquefaction of empty fruit bunch (EFB) fibres to fulfill green chemistry principles. The liquefied EFB was reacted with furfurylamine and paraformaldehyde through a Mannich condensation reaction. For comparison purposes, a guaiacol polybenzoxazine was synthesized using guaiacol as a phenolic component reacted with similar amine and aldehyde. Both types of polybenzoxazine synthesized from liquefied EFB and guaiacol were named L-fa and G-fa, respectively. The structural analysis was performed using Fourier-Transform Infrared (FTIR) and proton Nuclear Magnetic Resonance ( 1 H NMR). It was observed that the synthesis of benzoxazine groups for both types of polybenzoxazine was successful with the formation of the oxazine ring. Thermal stability showed that liquefied EFB polybenzoxazine (L-fa) has higher thermal stability above 360 °C compared to guaiacol-polybenzoxazine (G-fa), which is higher is 280 °C due to the complex structure of the lignin derivative in the liquefied EFB. For polymerization behavior, L-fa exhibit two exothermic peaks compared to three peaks on G-fa, indicating that L-fa is more reactive due to additional polymerizable sites present in L-fa. This work widens the synthesis route for the preparation of bio-based benzoxazine derived from oil palm waste which will perpetuate outstanding evolution towards the sustainable development of the bio-based polymeric industry.

关键词： Liquefaction Guaiacol Thermoset Renewable polymer Polybenzoxazine Solventless method

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Techno-economic and life-cycle assessment of electrochemical captured CO2 conversion process in monoethanolamine

Techno-economic and life-cycle assessment of electrochemical...

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2022 AIChE Annual Meeting

作者： Lee, Suhyun Choi, Woong Kim, Jae Hyung Hwang, Yun Jeong Na, Jonggeol Ewha Womans University School of Chemical Engineering and Materials Science Korea Republic of Ewha Womans University Graduate program in System Health Science and Engineering Korea Republic of Clean Energy Research Center Korea Institute of Science and Technology Korea Republic of Seoul National University School of Chemistry Korea Republic of Korea Republic of Ewha Womans University Dept. of Chemical Engineering & Material science Advanced Manufacturing Systems Laboratory Korea Republic of

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An Algorithm to Correct the Sensitivity Distribution of a Retarding Field Analyzer for Photoelectron Holography

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e-Journal of Surface science and Nanotechnology 2023年第3期21卷 183-187页

作者： Matsushita, Tomohiro Hashimoto, Yusuke Tomita, Hiroto Sun, Zexu Kawamura, Sota Fujii, Mami N. Mizuno, Jun Division of Material Science Nara Institute of Science and Technology 8916-5 Takayama Nara Ikoma630-0192 Japan Faculty of Science and Engineering Kindai University 3-4-1 Kowakae Higashiosaka Osaka577-8502 Japan Program on Smart Sustainable Manufacturing National Cheng Kung University 1 University Rd Tainan City701 Taiwan

Recently, we developed a retarding field analyzer (RFA) with high energy resolution and wide acceptance angles, which was installed at BL25SU in SPring-8, Japan. This apparatus enables us to measure photoelectron angular distributions (photoelectron holograms) with a solid angle of ±49° in a few minutes, and this approach is now being applied to measure the atomic arrangements of dopants and interfaces. However, correcting the sensitivity distribution of the measured images by the RFA is important in processing this data. The sensitivity distribution of the RFA is difficult to measure directly because it depends on the geometry of a sample, the kinetic energy of the photoelectrons, and so forth. Therefore, we developed an image processing algorithm to estimate the sensitivity distribution using spherical harmonics. This approach is more accurate than a Fourier transform and can efficiently correct the sensitivity distribution. Moreover, the algorithm can also be adopted in a wide variety of other applications in addition to RFA measurements. © 2023 The author(s)

关键词： Photoelectrons

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Effects of Co-Diluent on the Pore Structure, Patterning Fidelity, and Properties of Membranes Fabricated by Lithographically Templated Thermally Induced Phase Separation

SSRN

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SSRN 2022年

作者： Ding, Yifu Fan, Shouhong Blevins, Adrienne Martinez, Jaylene Membrane Science Engineering and Technology Center University of Colorado at Boulder BoulderCO80309-0427 United States Material Science & Engineering Program University of Colorado at Boulder BoulderCO80309 United States

Surface patterning as a physical surface modification method is promising for improving performance of liquid-based membrane processes. Lithographically templated, thermally induced phase separation (lt-TIPS) process is recently demonstrated for fabricating surface patterned microporous polymer membranes. However, the mechanical properties of the poly(vinylidene fluoride) (PVDF) membranes casted from tributyl O-acetylcitrate (ATBC) were poor, due to the predominant spherulitic morphology. In this study, we investigate the influences of diphenyl carbonate (DPC) as co-diluent to ATBC on the pore structure and patterning fidelity of lt-TIPS fabricated PVDF membranes. With the increase of DPC content in the mixed diluents, the phase separation path of the PVDF solution transitions from solid-liquid (S-L) to liquid-liquid (L-L), and correspondingly, the membrane pore structures evolve from dispersed spherulitic to bi-continuous cellular. The interconnected cellular morphology resulted from ATBC/DPC ratio of 20/80 shows superior mechanical properties of membranes compared with all other membranes, improving the toughness by nine times compared with pure ATBC system. The patterning fidelity improves from 59% to 79% as DPC content increases. The presence of the surface patterns on the PVDF membranes improves both the water contact angle WCA (by 12 – 18%) and the liquid entry pressure LEP (by 5 – 20%) which are desirable for membrane distillation (MD) applications. Concomitantly, patterned membranes also showed improved pure water permeance and water vapor flux in MD measurement. © 2022, The Authors. All rights reserved.

关键词： Membranes

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Development of liquid biofuel properties through the blending of biodiesel from used cooking oil and pyrolysis oil from low-quality rubber waste

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Case Studies in Chemical and Environmental Engineering 2025年 11卷

作者： Moonsin, Preecha Roschat, Wuttichai Phewphong, Sunti Watthanalao, Sittichai Maneerat, Bunterm Thammayod, Aekkaphon Leelatam, Tappagorn Suwannarong, Prawit Yoosuk, Boonyawan Janetaisong, Pathompong Promarak, Vinich Program of Chemistry Faculty of Science Ubon Ratchathani Rajabhat University Mueang District Ubon Ratchathani 34000 Thailand Biomass Energy Research Laboratory Center of Excellence on Alternative Energy Research and Development Institution Sakon Nakhon Rajabhat University Mueang District Sakon Nakhon 47000 Thailand Program of Chemistry Faculty of Science and Technology Sakon Nakhon Rajabhat University Mueang District Sakon Nakhon 47000 Thailand Innovation in Chemistry for Community Research Unit Faculty of Science and Technology Sakon Nakhon Rajabhat University Mueang District Sakon Nakhon 47000 Thailand Appropriated Technology Center Faculty of Science and Technology Sakon Nakhon Rajabhat University Mueang District Sakon Nakhon 47000 Thailand Program of Environment Science Faculty of Science and Technology Sakon Nakhon Rajabhat University Mueang District Sakon Nakhon 47000 Thailand National Energy Technology Center (ENTEC) 114 Thailand Science Park Phahonyothin Road Klong Luang Pathumthani 12120 Thailand Department of Material Science and Engineering School of Molecular Science & Engineering Vidyasirimedhi Institute of Science and Technology Wangchan Rayong 21210 Thailand

This study explores the potential of enhancing waste rubber pyrolysis oil (WRPO) by blending it with biodiesel derived from used cooking oil (WCO biodiesel oil) to improve its suitability as an alternative biofuel. The hypothesis posits that such blending will improve fuel stability, reduce acidity, and enhance combustion efficiency. The methodology included fuel characterization, preparation of various blending ratios, and evaluation of fuel properties, engine performance, and emissions. WRPO was found to contain high levels of aromatic and oxygenated compounds, resulting in high acidity (0.48 mg KOH/g), low viscosity (1.93 cSt), and a reduced heating value (44.39 MJ/kg). In contrast, WCO biodiesel oil exhibited strong ester characteristics, contributing to improved combustion and stability. Blending WRPO with WCO biodiesel oil at a 50:50 ratio (P50:B50 blend) enhanced fuel properties, including a density of 895 kg/m³, reduced viscosity (3.28 cSt), and a lower acid value (0.26 mg KOH/g), along with an increased heating value of 45.60 MJ/kg—approaching that of conventional diesel. Engine testing showed improved torque and reduced brake-specific fuel consumption (BSFC) compared to pure WRPO. Emission analysis revealed reductions in CO (18.5 %), HC (23.7 %), and smoke opacity (16.2 %), while NO_x emissions remained below diesel levels due to the lower combustion temperature of WRPO. These results suggest that the P50:B50 blend effectively addresses the drawbacks of WRPO, offering a promising, sustainable alternative to conventional diesel through improved performance, reduced emissions, and waste-to-energy valorization. © 2025 The Authors

关键词： Biodiesel oil Fuel blending Liquid biofuel Pyrolysis oil Sustainable energy

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Tunable Multimodal Guided Surface Lattice Resonances in Index-Discontinuous Environments

arXiv

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arXiv 2024年

作者： Huang, Suichu Yao, Kan Huang, Wentao Zhao, Xuezheng Zheng, Yuebing Pan, Yunlu Key Laboratory of Micro-Systems and Micro-Structures Manufacturing Ministry of Education School of Mechatronics Engineering Harbin Institute of Technology Harbin150001 China Walker Department of Mechanical Engineering Material Science and Engineering Program Texas Materials Institute The University of Texas at Austin AustinTX78712 United States

Surface lattice resonances (SLRs) in metasurfaces are promising in applications of sub-wavelength devices, owning properties such as high quality (high-Q) factors, large local field enhancement and extensive long-range interaction. The tunable peak position and multimodal resonances of SLRs further enhance their appeal for flexible and multi-wavelength light-matter interactions. Despite these advantages, the realization of tunable multimodal SLRs often requires reconfiguring the lattices, leading to limited tunability. Furthermore, current high-Q SLR implementations necessitate a homogeneous dielectric environment, restricting potential applications such as biosensors that are typically operated in an aqueous or air cladding on a substrate. Here we present guided-SLRs (gSLRs), which are easily accessible in index-discontinuous environments while retaining the multimodal property and straightforward tunability of mode number, resonance wavelengths and mode coupling strengths. The gSLRs are achieved by coupling the scattered light from metasurface units into a slab waveguide, creating a light propagating channel in the lattice plane within an index-asymmetric environment. Tailoring the radiation pattern of individual units with guided transverse electric (TE) and transverse magnetic (TM) modes, multimodal resonances in both orthogonal and parallel coupling directions are accomplished. The mode number and resonance wavelengths can be easily controlled by adjusting the waveguide configuration, while the mode coupling strength is tuned by the vertical position of lattices in the slab. Further shift of the multimodal gSLRs from visible to near-infrared is achieved by introducing a gold backplane. The easy-to-access, flexibly tunable and multimodal gSLRs in inhomogeneous media offer a promising solution to advancing the realization of ultrathin and ultracompact nano-optical and optoelectronic devices. Copyright © 2024, The Authors. All rights reserved.

关键词： Waveguides

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