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SSRN 2025年

作者： Kang, Tae-Uk Park, Youngjin Song, Sangmin Park, No-Cheol Jeon, Hojeong Park, Jin-Woo Department of Materials Science and Engineering Yonsei University Seoul03722 Korea Republic of Department of Mechanical Engineering Yonsei University Seoul03722 Korea Republic of Biomaterials Research Center Biomedical Research Division Korea Institute of Science and Technology Seoul02792 Korea Republic of Department of Mechanical Engineering Seoul National University 1 Gwanak-ro Gwanak-gu Seoul08826 Korea Republic of KU-KIST Graduate School of Converging Science and Technology Korea University Seoul02841 Korea Republic of

The human auditory system can sensitively detect sounds over a wide frequency range from 20 to 20,000 Hz. This capability is attributed to the multi-resonance characteristics of the basilar membrane in the inner ear, which enables frequency selectivity by responding to different frequencies at different positions. Sensorineural hearing loss is a condition in which sound stimuli fail to be converted into neural signals due to inner ear damage. Although cochlear implants (CIs) can address this condition, issues related to the external components and battery dependency of CIs are still challenging. Artificial basilar membranes that mimic the human auditory system achieve frequency selectivity using a trapezoidal membrane, similar to the actual basilar membrane. However, this approach results in sensitivity loss due to different active areas for different frequencies and challenges in miniaturization. In this study, frequency selectivity was achieved in the range from 570 to 8010 Hz while maintaining the constant active area within the frequency bandwidth by adjusting the mass and spring. To enable self-powered operation, fluorinated ethylene propylene was used as the electret material, and the surface potential was enhanced through microstructural control via sintering. With a total of nine channels with total sensing area of 15 × 15 mm2, a compact artificial basilar membrane was implemented. The proposed miniaturized artificial basilar membrane is expected to contribute to the realization of artificial auditory systems. © 2025, The Authors. All rights reserved.

关键词： Cochlear implants

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Prediction of enthalpy of vaporization for particulate matter through molecular dynamics using OPLS force field

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Journal of Aerosol science 2025年 188卷

作者： Jeong, Seung Weon Kim, Yeonseo Lim, Hyung-Kyu Chan Kim, Min Song, Chul Han Lee, Sangheon Department of Chemical Engineering and Materials Science Ewha Womans University 52 Ewhayeodae-gil Seodaemun-gu Seoul03760 Korea Republic of Graduate Program in System Health Science and Engineering Ewha Womans University 52 Ewhayeodae-gil Seodaemun-gu Seoul03760 Korea Republic of Division of Chemical Engineering and Bioengineering Kangwon National University Chuncheon Gangwon-do24341 Korea Republic of Department of Chemical Engineering Jeju National University Jeju63243 Korea Republic of Gwangju Institute of Science and Technology Gwangju61005 Korea Republic of

Chemical pollutant molecules dispersed in the atmosphere in the form of particulate matter are harmful to humans. Accurate data sets on the volatility of particulate matter components are required to address the ongoing issues of air pollution, as volatility determines the distribution of particulate components between gas and particle phases. Herein, we estimate the volatility for representative components of particulate matter by calculating the enthalpy of vaporization using molecular dynamics simulations. Compared with conventional static prediction methods such as Hansen solubility parameter and conductor-like screening model methods, the molecular dynamics method proves to effectively and accurately predict enthalpies of vaporization for a wide range of particulate matter components without additional parameter optimization. Using the molecular dynamics approach, we calculate enthalpies of vaporization for 71 representative organic species that could be primary particulate matter sources. The predicted enthalpy of vaporization values can be used as a fundamental data set for future air quality modeling and scientific understanding of the formation of particulate matter. Given the limitations in experimentally characterizing the volatility of various components in particulate matter, we envisage that our dynamical method based on the evaluation of intermolecular interactions can also be used to study the dynamics associated with the formation of particulate matter in addition to providing thermodynamic data. © 2025 Elsevier Ltd

关键词： Air quality

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Early and advanced crystallization stages in lithia-alumina-silica glasses nucleated by ZrO2

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Ceramics International 2025年

作者： Revelo, Raúl Julián Souza, Mauricio Lima Pena, Rafaella Bartz Yoshida, Satoshi Zanotto, Edgar Dutra Federal University of São Carlos Graduate Program in Materials Science and Engineering SP São Carlos13565-905 Brazil São Carlos Institute of Physics University of São Paulo SP São Carlos13566-590 Brazil Materials Integration Laboratories AGC Inc 1-1 Suehiro-Cho Tsurumi-Ku Kanagawa Yokohama230-0045 Japan

ZrO2 is one of the most effective and widely used nucleating agents in various families of glass-ceramics;however, its detailed mechanism remains a subject of debate. Understanding its nucleation mechanism requires a thorough analysis of microstructural evolution and the identification of factors influencing this process. This study investigates the effects of ZrO2 incorporation on the internal nucleation and microstructural evolution in stoichiometric LAS (Li2O·Al2O3·nSiO2) glass-ceramics of varying composition. Glasses with different SiO2 molar ratios (n = 2, 4, 5, and 6) were prepared with ZrO2 additions of 3.0 and 3.5 mol%. Several thermal treatments were employed, followed by characterization using XRD, SEM, STEM, and Raman spectroscopy. The results indicate that a minimum of 3.5 mol% ZrO2 is required to induce internal nucleation in LAS glasses with n = 4, 5, and 6. In these compositions, Zr-enriched regions formed through liquid-liquid phase separation serve as preferential sites for ZrO2 crystal precipitation, which subsequently induces the nucleation of β-quartz solid solution. Upon further treatment at higher temperatures, this metastable phase transforms into β-spodumene or its solid solution. As expected, increasing SiO2 content enhances glass network polymerization, as evidenced by the increased presence of Q3 species in Raman spectroscopy, leading to higher characteristic temperatures of glass transition and peak crystallization in DSC analyses. A higher SiO2 content results in fewer but larger crystals, whereas a lower SiO2 content promotes a higher number density of crystals within the glass matrix. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Glass ceramics

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Can air carbon arc gouging sensitize stabilized or low-carbon austenitic stainless steel?

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International Journal of Pressure Vessels and Piping 2025年 217卷

作者： de Bribean Guerra, Arthur Campesan, Gabriel Roberto Bolfarini, Claudemiro Koga, Guilherme Yuuki Federal University of São Carlos Department of Materials Science and Engineering Rod. Washington Luís SP São CarlosCEP 13565–905 Brazil Federal University of São Carlos Graduate Program in Materials Science and Engineering Rod. Washington Luís SP São CarlosCEP 13565–905 Brazil Rod. Washington Luís SP São CarlosCEP 13565–905 Brazil

This paper challenges the widespread skepticism surrounding the use of air carbon arc gouging (ACAG) in repair welding for critical applications in stainless steels, such as oil and gas assets, by evaluating its effects on the electrochemical properties of AISI 316L and AISI 321 austenitic stainless steels. This investigation examines the degree of sensitization and intergranular corrosion susceptibility in a simulated repair scenario. The experimental setup involved creating a gouged groove (6–7 mm depth) adjacent to the heat-affected zone (HAZ) using air carbon arc gouging (ACAG), followed by rewelding via submerged arc welding (SAW). Welded joints were analyzed under three surface preparation conditions after gouging: i) no cleaning, ii) brushing, and iii) rectifying. Electrochemical evaluation was conducted using the double loop potentiokinetic reactivation (DL-EPR) technique in accordance with ISO 12732:2017, while susceptibility to intergranular corrosion was assessed using ASTM A262-15, Practice A, oxalic acid etching tests. The results debunk the prevailing assumption that ACAG inevitably compromises the corrosion resistance of stainless steels. They demonstrate that, even without post-process cleaning, the procedure does not increase sensitization or susceptibility to intergranular attack. These findings validate ACAG as a viable, efficient, and cost-effective method for repair welding in low-carbon or stabilized austenitic stainless steels, simulating field conditions. This includes demanding industries such as oil and gas, where it ensures effective defect removal and full weld penetration while preserving asset integrity and resistance to localized corrosion. © 2025 Elsevier Ltd

关键词： Austenitic stainless steel

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A synergistic approach to tooth remineralization using nano-chitosan, fluoride, and pulsed magnetic field

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Scientific Reports 2025年第1期15卷 1-16页

作者： Khalil, Alaa M. Abbassy, Samar A. ElDin, Mona Mohy Kandil, Sherif El-Khatib, Ahmed M. Basic Sciences Department Faculty of Engineering Pharos University in Alexandria Alexandria Egypt Alexandria Dental Research Center Alexandria Egypt Dental Biomaterials Department Faculty of Dentistry Alexandria University Alexandria Egypt Materials Science Department Institute of Graduate Studies and Research Alexandria University Alexandria Egypt Physics Department Faculty of Science Alexandria University Alexandria Egypt

Globally, dental caries remains a health concern due to their complications of pain, infection, and tooth loss. The traditional dental remineralization by using fluoride is effective but limited in advanced caries and continued treatments. While Calcium phosphate is beneficial in restoring mineral, it needs external aids to be effective. This research explores a synergistic approach to enhance tooth remineralization for a total of 72 samples by harnessing the effects of nano-chitosan, fluoride, and exposure to magnetic fields. The nano-chitosan solution is prepared using an ionic interaction method, initially without fluoride, and is subsequently mixed with fluoride at concentrations of 0.05% and 2%. The structural and morphological properties of the prepared nano-chitosan were confirmed using SEM, XRD, and FTIR. The samples were exposed to a pulsed magnetic field (PMF) of 18 mT ± 2% to assess its effect on remineralization. Demineralized teeth samples are treated by synthesized agents combined and free of exposure. Treatment efficacy is evaluated using XRD, EDX, SEM, and the Vickers microhardness test. The results showed optimal enhancement of dental enamel treated by 0.05% fluoride and ChNPs with the aid of exposure. Its morphology showed new mineral layers, likely fluorapatite, and it had the highest Ca/P ratio and maximum VHN value. These findings support the possibility of prevention of early developed lesions of teeth by this non-invasive technique with low cost. Commercially, it is suggested to assess the benefit of using PMF combined with remineralizing agents instead of high-cost materials in domestic settings. © The Author(s) 2025.

关键词： Chitosan nanoparticles Enamel remineralization Fluoride Magnetic field Regenerative dentistry

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Self-powered, frequency selective resonator array type artificial basilar membrane for the totally implanted cochlear implant

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Nano Energy 2025年 142卷

作者： Kang, Tae-Uk Park, Youngjin Song, Sangmin Park, No-Cheol Jeon, Hojeong Park, Jin-Woo Department of Materials Science and Engineering Yonsei University Seoul 03722 South Korea Department of Mechanical Engineering Yonsei University Seoul 03722 South Korea Biomaterials Research Center Biomedical Research Division Korea Institute of Science and Technology Seoul 02792 South Korea Department of Mechanical Engineering Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 South Korea KU-KIST Graduate School of Converging Science and Technology Korea University Seoul 02841 South Korea

The human auditory system can sensitively detect sounds over a wide frequency range from 20 Hz to 20,000 Hz. This capability is attributed to the multi-resonance characteristics of the basilar membrane in the inner ear, which enables frequency selectivity by responding to different frequencies at different positions. Sensorineural hearing loss is a condition in which sound stimuli fail to be converted into neural signals due to inner ear damage. Although cochlear implants (CIs) can address this condition, issues related to the external components and battery dependency of CIs are still challenging. Artificial basilar membranes that mimic the human auditory system achieve frequency selectivity using a trapezoidal membrane, similar to the actual basilar membrane. However, this approach results in sensitivity loss due to different active areas for different frequencies and challenges in miniaturization. In this study, frequency selectivity was achieved in the range from 570 Hz to 8010 Hz while maintaining the constant active area within the frequency bandwidth by adjusting the mass and the spring constant. To enable self-powered operation, fluorinated ethylene propylene was used as the electret material, and the surface potential was enhanced through microstructural control via sintering. With a total of nine channels with total sensing area of 15 × 15 mm², a compact artificial basilar membrane was implemented. The proposed miniaturized artificial basilar membrane is expected to contribute to the realization of artificial auditory systems. © 2025 Elsevier Ltd

关键词： Auditory prosthetics Cochlear implant Electret Frequency selectivity Self-powered sensor Triboelectric nanogenerator

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Effect of double coating on microencapsulation of levofloxacin using the particles from gas-saturated solutions process as a controlled-release system

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Discover Chemistry 2025年第1期2卷 1-13页

作者： Sharmin, Tanjina Takeshita, Toshihiro Ouchi, Mikio Yoshida, Koji Znad, Hussein Saptoro, Agus Sarker, Zaidul Islam Irie, Keiichi Satho, Tomomitsu Nioh, Atsushi Masuda, Takaaki Muneyoshi, Yuuki Terayama, Suzuko Mishima, Kenji Department of Chemical Engineering Faculty of Engineering Fukuoka University Fukuoka Japan Research Institute of Composite Materials Fukuoka University Fukuoka Japan Resource Circulation Faculty of Environmental Engineering Fukuoka University Fukuoka Japan Faculty of Sciences Fukuoka University Fukuoka Japan Western Australian School of Mines: Minerals Energy and Chemical Engineering Faculty of Science and Engineering Curtin University Perth Australia Department of Chemical Engineering Faculty of Engineering Curtin Malaysia Graduate School Miri Sarawak Malaysia Department of State Program and Food Science Northern Marianas College Saipan USA Faculty of Pharmaceutical Sciences Fukuoka University Fukuoka Japan Yokohama Research Center Pola Chemical Industries Yokohama Japan

A novel double-coating technique was employed to encapsulate levofloxacin (LVF), a potent antibacterial drug, using the particles from gas-saturated solutions (PGSS) process to achieve extended release. The primary coating utilized glyceryl tristearate (GT), a lipid with a high melting point (72 °C), followed by a secondary coating with trimyristin (TM), a lipid with a lower melting point (52 °C). For comparison, a single-coating approach was also explored, using the biocompatible polymer poly-(ε-caprolactone) (PCL). The resulting particles were characterized for their shape, size, and LVF encapsulation efficiency, with confirmation of LVF entrapment provided by Fourier transform infrared (FTIR) spectroscopy, and X‐ray powder diffraction (XRD) analysis. The particles, with an average diameter of 95.3 ± 16.5 μm, exhibited an encapsulation efficiency of up to 92.1 ± 2.5%. Furthermore, in vitro release studies revealed that the double-coated microcapsules effectively suppressed the initial burst release and provided controlled, extended release of LVF (t30D = 36.3%), demonstrating the efficiency of this encapsulation method for prolonged drug delivery.

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Rosa multiflora fructus and its active compound ellagic acid improve depressive-like behaviors in mice via monoamine oxidase inhibition

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Biomedicine and Pharmacotherapy 2025年 188卷 118169-118169页

作者： Kim, Minji Lim, Dong Wook Kim, Min-Sun Nam, Heejin Shin, Sooim Lee, Changho Um, Min Young Food Functionality Research Division Korea Food Research Institute Wanju 55365 South Korea Department of Food Biotechnology University of Science & Technology Daejeon 34113 South Korea Interdisciplinary Program of Bioenergy and Biomaterials Graduate School College of Engineering Chonnam National University Gwangju 61186 South Korea Department of Biotechnology & Bioengineering College of Engineering Chonnam National University Gwangju 61186 South Korea

Depression is a significant global health challenge, imposing severe social and economic burdens. Rosa multiflora fructus possesses a range of biological properties;however, its role in reducing stress hormone-induced depression remains unclear. This study examined the antidepressant effects of Rosa multiflora fructus extract (RMFE) on corticosterone (CORT)-induced depressive-like behaviors in mice and explored the underlying molecular mechanisms. ICR mice were administered CORT (40 mg/kg/day, i.p.) for 8 weeks to induce depressive-like behaviors. They were then treated with RMFE (100 or 300 mg/kg/day, p.o.) or selegiline (10 mg/kg/day, p.o.) as a positive control. RMFE treatment significantly alleviated depressive-like behaviors, as evaluated by the tail suspension and forced swimming tests. Furthermore, RMFE reduced hippocampal astrocyte hypertrophy and lowered the protein and mRNA expression of monoamine oxidase A and B (MAOA and MAOB). Phytochemical analysis using UPLC-MS/MS identified five flavonoids in RMFE, including ellagic acid (EA), hyperoside, isoquercetin, quercetin, and quercetin-3-glucuronide. In silico molecular docking revealed that these phenolic compounds interact with MAOA and MAOB, with EA exhibiting the strongest binding affinity. Consistently, EA administration effectively alleviated depressive-like behaviors and increased monoamine neurotransmitter levels in CORT-treated mice. These results suggest that RMFE exerts antidepressant effects by inhibiting MAO, restoring monoamine levels, and modulating hippocampal astrocytic hypertrophy, with EA identified as the primary bioactive compound driving its efficacy. © 2025

关键词： Corticosterone Depression Ellagic acid Monoamine oxidase Rosa multiflora fructus

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Microstructure evolution and local strengthening mechanisms in CoCrFeMnNi high entropy alloy joints reinforced with Inconel 625

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materials science and engineering: A 2025年 937卷

作者： Shen, Jiajia Yang, Jin Choi, Yeon Taek Gonçalves, Rita Pedro, Rodrigo Santana, D.A. Coury, F.G. Schell, N. Zeng, Zhi Kim, Hyoung Seop Oliveira, J.P. UNIDEMI Department of Mechanical and Industrial Engineering NOVA School of Science and Technology Universidade NOVA de Lisboa Caparica2829-516 Portugal CENIMAT/I3N Department of Materials Science NOVA School of Science and Technology Universidade NOVA de Lisboa Caparica2829-516 Portugal School of Materials Engineering Shanghai University of Engineering Science Shanghai201620 China Pohang790-794 Korea Republic of Graduate Program in Materials Science and Engineering Federal University of São Carlos Rodovia Washington Luís km 235 SP-310 São Carlos São Paulo13565-905 Brazil Helmholtz-Zentrum Hereon Institute of Materials Physics Max-Planck-Str. 1 Geesthacht21502 Germany School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Chengdu611731 China

In the fusion-based welding processes, filler materials are commonly used to adjust and improve the composition of the fusion zone with the aim of optimizing both microstructure and mechanical properties. However, in the field of welding high entropy alloys, the influence of different filler materials on the microstructure and mechanical response is still scarce, owing to the yet incipient usage of welding technologies for these novel, advanced engineering alloys. To bridge this knowledge gap, Inconel 625 filler wire was used during gas metal arc welding of the well-known CoCrFeMnNi high entropy alloy. To systematically analyze the microstructure evolution and mechanical properties of the welded joints, multiscale characterization techniques were employed. It is shown that the different regions of the welded joint possess distinct microstructural features due to the weld thermal cycle, which is further compounded in the fusion zone by the introduction of the filler material. The use of Inconel 625 filler promotes a solid solution strengthening effect in the fusion zone and became the main contributor to the yield strength of this region (302 MPa (via solid solution strengthening) vs 478 MPa (yield stress from tensile experiments). Since Hall-Petch strengthening is predominant in both base material and heat affected zone, but not on the fusion zone due to the large grain structure that developed, the addition of Inconel 625 filler demonstrates to be a feasible approach to increase the typically low fusion zone strength. By coupling microstructural characterization with mechanical property analysis, aided by the calculation of the strengthening mechanisms, we unveil processing, microstructure, property relationships, providing a broader basis for the widespread application of gas metal arc welding for high entropy alloys. © 2025 The Authors

关键词： Tensile testing

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Highly active vitamin B₁ Pickering emulsion interface catalysis systems for Knoevenagel condensation

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Surfaces and Interfaces 2025年 68卷

作者： Zhang, Po Liu, Daliang Chang, Xiaohong Song, Xi-Ming Song, Zhining Li, Quan Liaoning Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials College of Chemistry Liaoning University Shenyang 110036 China Center for Analysis and Testing College of Chemistry Liaoning University Shenyang 110036 China Institute of Advanced Materials and School of Chemistry and Chemical Engineering Southeast University Nanjing Nanjing 211189 China Materials Science Graduate Program Kent State University Kent 44242 OH United States

Vitamin B1 (VB1) is characterized by its non-toxicity, low cost, and good stability, making it a highly promising biobased green catalyst with significant potential for development. Due to its favorable water solubili... 详细信息

Vitamin B₁ (VB₁) is characterized by its non-toxicity, low cost, and good stability, making it a highly promising biobased green catalyst with significant potential for development. Due to its favorable water solubility, research on VB₁ as a catalyst is currently limited to homogeneous and single-solvent heterogeneous catalytic systems, and there are inherent limitations in how to fully dissolve substrates to enhance catalytic performance and expand the range of reaction substrates. In this study, VB₁ was immobilized onto the surface of graphene oxide nanosheets (GOs) through multiple interaction forces, thereby forming GOs-VB₁ composite nanosheets. With the nanosheets, stable toluene/water Pickering emulsion interfacial catalysis (PEIC) systems were constructed for Knoevenagel condensation. By using the PEIC systems, the yields of eight benzylidenemalononitrile derivatives reached 85%-95% after 30 min reaction under static reaction condition of non-agitation at 40 °C with the dosage of only 0.35 wt% GOs-VB₁, much higher than that catalyzed by VB₁ or GOs-VB₁ in the corresponding single or mixed solvents under the same conditions. The excellent catalytic performance of the VB₁-based PEIC systems under mild reaction conditions is attributed to the sufficient dissolution of the reactants (malononitrile and benzaldehyde or its derivatives) in the continuous and dispersed phases of the emulsion, respectively, as well as the stable enrichment of the catalyst VB₁ at the large emulsion interface. The PEIC systems exhibited consistently high reaction yields even after undergoing six of recycling. © 2025

关键词： Graphene oxide Knoevenagel condensation Pickering emulsion interfacial catalysis (PEIC) Vitamin B1 (VB1)

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