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Regioisomeric effects regulating the physicochemical properties of complex copolymers in thin films

European Polymer Journal 2025年 234卷

作者： Hyeji Lee Seungjun Kim Yun Hee Ko Juyoung Park Dahye Lee Yejin Ku Chanjae Ahn Yoonhyun Kwak Minsang Kim Jin-Kyun Lee Myungwoong Kim Department of Chemistry and Chemical Engineering Inha University Incheon 22212 Republic of Korea Program in Environment and Polymer Engineering Inha University Incheon 22212 Republic of Korea Department of Polymer Science and Engineering Inha University Incheon 22212 Republic of Korea Material Research Center Samsung Advanced Institute of Technology Samsung Electronics Suwon 16677 Republic of Korea

We demonstrate that minimal alterations to the chemical structure of a hydroxystyrene (HOST)-containing terpolymer lead to significant changes in its physicochemical properties, which in turn govern photolithographic pattern formation in chemical amplification mechanism. While the structures of the three repeating units, their compositions, and the molecular weight characteristics of the terpolymers were controlled to be similar, the location of the phenolic OH groups was adjusted by copolymerizing o -, m -, and p -acetoxystyrene, subsequently transformed into o -, m -, and p -HOST through deacetylation. In the studies to examine the physicochemical properties of the copolymers, the copolymer with p -HOST showed dissolution rate in n -butyl acetate ( n BA) of ≈ 15 nm/s, which was lower than that of copolymer with m -HOST (≈ 18 nm/s) and o -HOST (≈ 27 nm/s), further showing high linear correlation with the Hansen space distance between the copolymers and n BA. Moreover, the acid diffusions in the thin film, which plays a significant role in acid-catalyzed deprotection of the copolymers to solubility modulation, was affected by the location of the phenolic OH: the fastest and slowest acid diffusions were observed in the copolymers of p -HOST and o -HOST, respectively. The regioisomerism further affects the photolithographic performance collectively: (i) in contrast curve, light energy required to change the solubility was in order of p -HOST < m -HOST < o -HOST, and (ii) the height of the formed pattern was in order of p -HOST > m -HOST > o -HOST, highlighting the significance of chemical structure design and the fundamental understanding of structure–property relationships.

关键词： Acid diffusion chemically amplified resist Dissolution behavior Hansen solubility parameter Poly(hydroxystyrene) Regioisomeric effect

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Energy efficient harvesting of Spirulina sp. from the growth medium using a tilted panel membrane filtration

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Bioresource Technology Reports 2021年 15卷

作者： Ismail, Insyirah Kurnia, Kiki Adi Samsuri, Shafirah Bilad, Muhammad Roil Marbelia, Lisendra Ismail, Noor Maizura Khan, Asim Laeeq Budiman, Arief Susilawati, Susilawati Department of Chemical Engineering Universiti Teknologi PETRONAS Bandar Seri IskandarPerak32610 Malaysia Department of Marine Faculty of Fisheries and Marine Universitas Airlangga Jalan Mulyorejo Kampus C Surabaya60115 Indonesia Jl. Pemuda No. 59A Mataram83126 Indonesia Department of Chemical Engineering Faculty of Engineering Universitas Gadjah Mada Jl. Grafika No. 2 Yogyakarta55281 Indonesia Faculty of Engineering Universiti Malaysia Sabah Jln UMS Kota KinabaluSabah88400 Malaysia Department of Chemical Engineering COMSATS University Islamabad Islamabad Pakistan Master of Science Education Program University of Mataram Jl. Majapahit No. 62 Mataram83125 Indonesia

Membrane fouling is one of the main drawbacks in membrane-based microalgae harvesting. This study assessed the tilted panel to enhance filtration performance of Spirulina sp. broth. The influences of the operating parameters including the tilting angle, aeration rate and membrane materials on filtration performance and energy consumption were evaluated. Results showed that the system was effective and energy-efficient for membrane fouling control. The permeability peaked at a tilting of 45° thanks to combination of aeration and panel tilting. The microfiltration performed better than the ultrafiltration membrane due to the effective impact of air bubbles for foulant scouring that maximized the membrane intrinsic property. Small aeration rate of 1.0 L/min offered a high plateau permeability of 540 L/(m2·hr·bar) in which reversible fouling almost fully absent. The high permeability could be achieved under a low energy input of 0.2 kWh/m3. © 2021 Elsevier Ltd

关键词： Microalgae

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BPS2025 - Artificial intelligence enabled image analysis of genomic DNA visualized under electron microscopy using nanoparticle-tagged peptides

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Biophysical Journal 2025年第3期124卷 311a-312a页

作者： Priyannth Ramasami Sundharbaabu Junhyuck Chang Yunchul Kim Youmin Shim Byoungsang Lee Chanyoung Noh Sujung Heo Seung S. Lee Sang-Hee Shim Kwang-il Lim Kyubong Jo Jung H. Lee Department of Advanced Materials Science and Engineering Sungkyunkwan University Suwon-si Republic of Korea Department of Chemistry and Interdisciplinary Program of Integrated Biotechnology Sogang University Seoul Republic of Korea School of Chemistry and Chemical Engineering University of Southampton Southampton United Kingdom Department of Chemistry Korea University Seoul Republic of Korea Department of Chemical and Biological Engineering Sookmyung Women’s University Seoul Republic of Korea Department of MetaBioHealth Sungkyunkwan University Suwon-si Republic of Korea

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Hybrid Vesicles Enable Mechano-Responsive Hydrogel Degradation

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Angewandte Chemie 2023年第41期135卷

作者： Sung-Won Hwang Chung-Man Lim Prof. Cong Truc Huynh Hossein Moghimianavval Prof. Nicholas A. Kotov Prof. Eben Alsberg Prof. Allen P. Liu Department of Chemical Engineering University of Michigan Ann Arbor MI 48109 USA Department of Materials Science and Engineering University of Michigan Ann Arbor MI 48109 USA Department of Biomedical Engineering University of Illinois Chicago Chicago IL 60612 USA Department of Mechanical Engineering University of Michigan Ann Arbor MI 48109 USA Departments of Biomedical Engineering Macromolecular Science and Engineering Biointerfaces Institute University of Michigan Ann Arbor MI 48109 USA Departments of Orthopedic Surgery Pharmacology and Regenerative Medicine and Mechanical and Industrial Engineering University of Illinois Chicago Chicago IL 60612 USA Departments of Biomedical Engineering Biophysics Cellular and Molecular Biology Program Applied Physics Program University of Michigan Ann Arbor MI 48109 USA

Stimuli-responsive hydrogels are intriguing biomimetic materials. Previous efforts to develop mechano-responsive hydrogels have mostly relied on chemical modifications of the hydrogel structures. Here, we present a simple, generalizable strategy that confers mechano-responsive behavior on hydrogels. Our approach involves embedding hybrid vesicles, composed of phospholipids and amphiphilic block copolymers, within the hydrogel matrix to act as signal transducers. Under mechanical stress, these vesicles undergo deformation and rupture, releasing encapsulated compounds that can control the hydrogel network. To demonstrate this concept, we embedded vesicles containing ethylene glycol tetraacetic acid (EGTA), a calcium chelator, into a calcium-crosslinked alginate hydrogel. When compressed, the released EGTA sequesters calcium ions and degrades the hydrogel. This study provides a novel method for engineering mechano-responsive hydrogels that may be useful in various biomedical applications.

关键词： Block Copolymers Functional Material Stimuli-Responsive Hydrogel Stress-Induced Degradation Vesicles

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Upcycling can waste and plastic bottle as functional material: Analysis of green process and simultaneous adsorption-photocatalytic performances

Case Studies in Chemical and Environmental Engineering

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Case Studies in chemical and Environmental engineering 2025年 11卷

作者： Nurherdiana, Silvana Dwi Rahimah, Alya Dirja, Ramadhanu Tungga Dewi, Kun Prasasti Ramadhani, Mohamad Rizki Nugraha, Reva Edra Fitriana Wafi, Abdul Master of Environmental Science Study Program Faculty of Engineering and Science Universitas Pembangunan Nasional Veteran Jawa Timur Jl. Rungkut Madya No. 1 Gn. Anyar Kec. Gunung Anyar East Java Surabaya 60294 Indonesia Study Program of Chemical Engineering Faculty of Engineering and Science Universitas Pembangunan Nasional Veteran Jawa Timur Jl. Rungkut Madya No. 1 Gn. Anyar Kec. Gunung Anyar East Java Surabaya 60294 Indonesia Low Carbon Technology Research Centre Universitas Pembangunan Nasional Veteran Jawa Timur Jl. Rungkut Madya No.1 Gn. Anyar Kec. Gunung Anyar East Java Surabaya 60294 Indonesia Department of Physics Universitas Negeri Surabaya East Java Surabaya 60231 Indonesia Research Center for Food Technology and Processing National Research and Innovation Agency (BRIN) Gading Playen Gunungkidul Yogyakarta 55861 Indonesia

This study presents an investigation of chemical and physical characterization, green process analysis, techno-economic considerations, and carbon emissions for synthesizing metal-organic frameworks (MOFs) from plastic and can waste using microwave-assisted synthesis. The microwave-assisted synthesis proves to be more cost-effective, with a reduction in CO₂ emissions by up to 80%. The synthesized material (MIL-Mw-U) demonstrates excellent performance in methylene blue (MB) removal, achieving 98.41% removal, with 97.87% removal although the catalyst is used in the third cycle. The adsorption of methylene blue (MB) onto MIL-Mw-U achieved a maximum capacity of 295.26 mgg⁻¹ at pH 3 and decreased to 258.68 mgg⁻¹ at pH 11 due to OH⁻ competition. The Langmuir isotherm (R² = 0.9381) and pseudo-second-order kinetics (R² = 0.999) confirmed monolayer chemisorption as the dominant mechanism. This innovative approach supports circular economy principles by converting can and plastic bottle waste into functional material for dye removal, offering sustainable solutions for environmental challenges. © 2025 The Authors

关键词： Adsorption Dye removal Green chemistry Metal organic frameworks Photocatalytic SDGs 13 Climate Change

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Readily prepared and processed multifunctional MXene nanocomposite hydrogels for smart electronics

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SmartMat 2023年第2期5卷

作者： Jiahui Huang Xianwu Huang Peiyi Wu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Chemistry and Chemical Engineering Center for Advanced Low-Dimension Materials Donghua University Shanghai China State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science and Laboratory of Advanced Materials Fudan University Shanghai China

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Enhanced Persulfate Activation by Sulfur-Modified Fe3o4 Composites for Atrazine Degradation: Performance and Mechanism

SSRN

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SSRN 2022年

作者： Zheng, Han Du, Jiangkun Zhong, Hua Yuan, Qian Zhang, Jiaquan Kang, Wei Sun, Qingbin Tao, Min Xiao, Wensheng Dionysiou, Dionysios D. Huang, Ying Hubei Key Laboratory of Mine Environmental Pollution Control and Remediation Hubei Polytechnic University Huangshi435003 China School of Environment Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China School of Environmental Studies China University of Geosciences Wuhan430074 China State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University Wuhan430072 China School of Earth and Space Exploration Arizona State University TempeAZ United States School of Environmental Science and Engineering Hubei Polytechnic University Huangshi435003 China Environmental Engineering and Science Program Department of Chemical and Environmental Engineering 705 Engineering Research Center University of Cincinnati CincinnatiOH45221-0012 United States

A novel sulfur-modified Fe3O4 composite (SF10) with excellent magnetic properties and core-shell structure was prepared via a solvothermal method. Compared with unmodified Fe3O4, SF10 exhibited excellent performance on the activation of peroxydisulfate (PDS) for atrazine degradation and maintained good reusability. According to the quenching experiments and electron paramagnetic resonance (EPR) test, hydroxyl radical (•OH) and sulfate radical (SO4•−) were the main active species. Characterizations revealed that sulfur modification introduced pyrite and pyrrhotite phases into Fe3O4 to improve the catalytic activity and electrical conductivity. Density functional theory calculations showed that sulfur modification enhanced the electron transfer from Fe3O4 to PDS and the adsorption of PDS on the catalyst surface, favoring the PDS activation. Moreover, the surface reducing sulfur species (≡S2− and ≡S22−) acted as the electron donor for Fe(II) regeneration, driving a faster Fe(II)/Fe(III) redox cycle of SF10 for the activation of PDS. This study provides insights of the synergism between sulfur and iron, and broadens the application of Fe3O4 in PDS-based advanced oxidation processes for wastewater treatment. © 2022, The Authors. All rights reserved.

关键词： Magnetite

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Enantio- and Diastereoselective Synthesis and Spiral-Stair-Like Single Helix Assembly of Figure-Eight Cyclophenylenes

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Angewandte Chemie 2025年

作者： Kohei Adachi Juntaro Nogami Daisuke Hashizume Daiki Tauchi Masashi Hasegawa Ken Tanaka Department of Chemical Science and Engineering Institute of Science Tokyo O-okayama Meguro-ku Tokyo 152–8550 Japan Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya Aichi 464–8603 Japan RIKEN Center for Emergent Matter Science (CEMS) 2-1 Hirosawa Wako Saitama 351-0198 Japan Graduate School of Science Kitasato University Sagamihara Kanagawa 252–0373 Japan

Helix assemblies of chiral molecules can transfer microscopic unimolecular chirality to macroscopic supramolecular chirality, enhancing various chiral properties. In addition to the commonly observed spiral-column-like helix assembly, a small number of spiral-stair-like helix assemblies have also been reported in aromatic nanocarbons with multiple chirality-related irregularities. However, they require separation of diastereomers and/or enantiomers or do not have stable chirality. Here, we report the enantio- and diastereoselective synthesis of figure-eight [10]cyclophenylenes with stable helical chirality by the rhodium-catalyzed four consecutive intramolecular [2 + 2 + 2] cycloadditions of dodecaynes with two flexible biphenyl units. The chiral figure-eight [10]cyclophenylene with ethyl and methyl side chains exhibits the spiral-stair-like single helix assembly in the crystal due to CH–π and CH–O interactions and good CPL properties in solution. Experimental verification of the enantio- and diastereodetermining steps of four consecutive [2 + 2 + 2] cycloadditions is also reported.

关键词： [2 + 2 + 2] Cycloaddition Asymmetric synthesis Figure-eight cyclophenylenes Rhodium Spiral-stair-like single helix assembly

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Chiral Phonons in Biocrystals

Research Square

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Research Square 2021年

作者： Choi, Won Jin Yano, Keiichi Cha, Minjeong Colombari, Felippe M. Wang, Yichun Lee, Sang Hyun Kruger, John M. de Moura, André F. Kotov, Nicholas A. Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States Biointerfaces Institute University of Michigan Ann ArborMI48109 United States Department of Chemical Engineering University of Michigan Ann ArborMI48109 United States SP Campinas13.083-100 Brazil Department of Biomedical Engineering University of Michigan Ann ArborMI48109 United States Department of Chemical and Biochemical Engineering University of Notre Dame South BendIN46556 United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States Department of Small Animal Clinical Sciences Michigan State University East LansingMI48824 United States Department of Chemistry Federal University of São Carlos SP São Carlos13565-905 Brazil Program in Macromolecular Science and Engineering University of Michigan Ann ArborMI48109 United States

Chiral phonons are concerted mirror-symmetric movements of atomic groups connected by covalent and intermolecular bonds. Finding chiral phonons in biocrystals is fundamentally and technologically important because these lattice vibrations should be highly specific to their short- and long-range organizations. Based on theoretical and experimental data they might be expected but not identified or utilized. Here we show that terahertz chiroptical spectroscopy enables registration and attribution of chiral phonons in microcrystals of numerous amino acids and dipeptides. Theoretical analysis and computer simulations confirm that sharp mirror-symmetric bands observed for left and right enantiomers originate from collective vibrations of biomolecules interconnected by hydrogen bonds into helical chains. Structure-property relationships for strong phonons with rotatory components in biocrystals were also identified. Bladder stones and health supplements display strong spectral signatures of chiral phonons indicating their immediate importance for biomedicine. © 2021, CC BY.

关键词： Phonons

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NiOx passivation in perovskite solar cells: from surface reactivity to device performance

arXiv

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arXiv 2024年

作者： Mohanraj, John Samanta, Bipasa Almora, Osbel Escalante, Renán Marsal, Lluis F. Jenatsch, Sandra Gadola, Arno Ruhstaller, Beat Anta, Juan A. Toroker, Maytal Caspary Olthof, Selina Department of Chemistry University of Cologne Greinstrasse 4−6 Cologne50939 Germany Department of Materials Science and Engineering Technion–Israel Institute of Technology Haifa3600003 Israel Departament d'Enginyeria Electrònica Elèctrica i Automàtica Universitat Rovira i Virgili Tarragona43007 Spain Department of Physical Chemical and Natural Systems Universidad Pablo de Olavide Sevilla41013 Spain Fluxim AG Katharina-Sulzer-Platz 2 Winterthur8400 Switzerland The Nancy and Stephen Grand Technion Energy Program Haifa3200003 Israel

Non-stoichiometric nickel oxide (NiOx) is the only metal oxide successfully used as hole transport material in p-i-n type perovskite solar cells (PSCs). Its favorable opto-electronic properties and facile large-scale preparation methods are potentially relevant for future commercialization of PSCs, though currently low operational stability of PSCs containing NiOx hole transport layers are reported. Poorly understood degradation reactions at the interface to the perovskite are seen as cause for the inferior stability and a variety of interface passivation approaches have been shown to be effective in improving the overall solar cell performance. To gain a better understanding of the processes happening at this interface, we systematically passivated possible specific defects on NiOx with three different categories of organic/inorganic compounds. The effects on the NiOx and the perovskite (MAPbI3) were investigated using x-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and scanning electron microscopy (SEM) where we find that the structural stability and film formation can be significantly affected. In combination with Density Functional Theory (DFT) calculations, a likely origin of NiOx-perovskite degradation interactions is proposed. The surface passivated NiOx was incorporated into MAPbI3 based PSCs and its influence on overall performance, particularly operational stability, was investigated by current-voltage (J-V), impedance spectroscopy (IS), and open circuit voltage decay (OCVD) measurements. Interestingly, we find that a superior structural stability due to an interface passivation must not relate to high operational stability. The discrepancy comes from the formation of excess ions at the interface which negatively impacts all solar cell parameters. © 2024, CC BY-NC-SA.

关键词： Nickel oxide

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