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Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XII 2019

作者： Cheng, Gong Choi, Won Jin Jang, Hee-Jeong Kotov, Nicholas A. Norris, Theodore B. Department of Physics University of Michigan Ann ArborMI48109 United States Center for Ultrafast Optical Science University of Michigan Ann ArborMI48109 United States Department of Materials Science and Engineering University of Michigan Ann ArborMI48109 United States Department of Chemical Engineering University of Michigan Ann ArborMI48109 United States Biointerfaces Institute University of Michigan Ann ArborMI48109 United States Program in Macromolecular Science and Engineering University of MI Ann ArborMI48109 United States Department of Electrical Engineering and Computer Science University of Michigan Ann ArborMI48109 United States

ISBN: (纸本)9781510624764

We have developed two terahertz (THz) polarimetric methodologies based on terahertz time-domain spectroscopy (THz-TDS) incorporating three wire-grid polarizers. They require no change to existing THz-TDS setups and are free of any complicated electronic controls and synchronizations. In addition to the standard quantities measured by THz-TDS such as transmission and optical constants, they provide complete information on the anisotropy and chirality for a generalized material through measurements of the full electric field vector and hence the Jones matrix, and calculating specific quantities. Thus terahertz time-domain polarimetry (THz-TDP) can be considered as an upgrade of the conventional THz-TDS, needed for full characterization of anisotropic and chiral materials. In this paper, we describe the details of the experimental settings, mathematical procedures and property quantifications in these methodologies. We present experimental results on an anisotropic polymer sheet showing the effectiveness of the methods, and preliminary data for chiral DNA molecules for the first time in the THz frequency range. © 2019 SPIE.

关键词： Polarimeters

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A Nanosensor Platform for Biologging in Marine Animals

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ACS sensors 2025年 2025 May 29页

作者： Xiaojia Jin Ali A Alizadehmojarad Volodymyr B Koman Gabriel Sánchez-Velázquez Manki Son Rory Wilson Mark Meekan Carlos M Duarte Michael S Strano Department of Chemical Engineering Massachusetts Institute of Technology 77 Massachusetts Avenue Cambridge Massachusetts 02139 United States. Biosciences College of Science Swansea University Singleton Park Swansea SA2 8PP U.K. The Indian Ocean Marine Research Centre (IOMRC) The University of Western Australia (M470) 6009 Perth WA Australia. Marine Science Program Bioscience and Environmental Science and Engineering Division King Abdullah University of Science and Technology Thuwal 23955-6900 Saudi Arabia.

Biologging has significantly advanced ecological biology by enabling the collection of data from free-roaming animals in their natural habitats. Traditionally, these measurements have largely been limited to temperature, pressure, and movement. Incorporating physiological data of animal biomarkers could yield valuable orthogonal data sets, providing a more nuanced understanding of organisms in the context of their environments and behaviors. Despite this potential, successful collection of such biochemical information remains absent and thus motivates new sensor platforms. Toward this end, we explore the hardware and nanosensor optimization of animal implantable sensors for tracking hormone levels in marine animals. The transducer element is based on polymer-wrapped single-walled carbon nanotubes that act as nanosensors embedded within a biocompatible poly(ethylene glycol) diacrylate hydrogel. This work investigates the performance of the nanosensor hydrogel under various temperatures, illumination conditions, and nanoparticle concentrations in the hydrogel. We further prototype a miniaturized fluorescent system for integration into existing, commercially available acoustic tags widely used in marine biology studies. We demonstrate a baseline of 100 nM for the detection limit of progesterone as an example of an important hormone in marine animals using the integrated nanosensor hydrogel in this platform. Further improvement is possible with optimization of the signal-to-noise ratio via hardware development. This developed form-factor will complement the presently collected data by providing insights into the physiological state of the animals in the context of their behavior and environments.

关键词： biochemical monitoring biologging nanosensor steroid sensing tagging

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Efficient (S)-acetoin production in Saccharomyces cerevisiae by modulating α-acetolactate decarboxylase stereospecificity

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Bioresource technology 2025年 434卷 132767页

作者： Seungwoo Cha Byeongseon Jang Daeyeol Lee Injae Cho Wooyoung Park Youngmin Lee Hyesoo Shin Minyoung Kim Changmin Sung Ji-Sook Hahn Department of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea. Electronic address: mashmalo@snu.ac.kr. Department of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea. Electronic address: qudtjs5095@snu.ac.kr. Department of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea. Electronic address: greenberry05@snu.ac.kr. Department of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea. Electronic address: ept9796@snu.ac.kr. Department of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea. Electronic address: wypkr@snu.ac.kr. Department of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea. Electronic address: kevinlee9@snu.ac.kr. Department of Chemical and Biological Engineering Institute of Chemical Processes Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea. Electronic address: shs6482@snu.ac.kr. Doping Control Center Korean Institute of Science and Technology 5 Hwarang-ro 14-gil Seongbuk-gu Seoul 02792 Republic of Korea Interdisciplinary Program for Biochemical Engineering and Biotechnology Seoul National University 1 Gwanak-ro Gwanak-gu Seoul 08826 Republic of Korea. Electronic address: kmy5@kist.re.kr. Doping Control Center Korean Institute of Science and Technology 5 Hwarang-ro 14-gil Seongbuk-gu Seoul 02792 Republic of Korea. Electronic address: scm@kist.re.kr. Department of Chemical and Biological Engineering Institute of Chemical Processes Seoul National Univ

Acetoin, a four-carbon α-hydroxyketone with a chiral center, exists as two stereoisomers-(R)- and (S)-acetoin-both of which hold potential pharmaceutical applications. While microbial production of (R)-acetoin has been well studied, fermentative production of (S)-acetoin remains limited due to its reliance on non-enzymatic spontaneous decarboxylation of unstable intermediates. As a result, costly precursors like diacetyl or 2,3-butanediol are often used, posing challenges for economic scale-up. In this study, we engineered Saccharomyces cerevisiae to produce stereospecific (S)-acetoin directly from glucose, a low-cost and abundant carbon source. The native racemic acetoin pathway was eliminated by disrupting pyruvate decarboxylase (PDC) activity, and the stereospecificity of Bacillus subtilis α-acetolactate decarboxylase (ALDC), which naturally favors (R)-acetoin, was engineered to preferentially produce (S)-acetoin. Oxygen uptake was genetically enhanced to support efficient conversion of intermediates and suppress byproducts. This work established a novel, enzyme-driven pathway for (S)-acetoin biosynthesis with over 90% enantiomeric purity, without the addition of chemical compounds.

关键词： (S)-Acetoin Enzyme engineering Metabolic engineering Oxygen transfer Pyruvate decarboxylase Saccharomyces cerevisiae Stereoselectivity

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chemical Electron Tomography at Lower Dose and Higher Resolution

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Microscopy and Microanalysis 2024年第SUPPLEMENT_1期30卷

作者： Hovden, Robert Schwartz, Jonathan Sung, Suk Hyun Di, Zichao Wendy Jiang, Yi Manassa, Jason Pietryga, Jacob Qian, Yiwen Cho, Min Gee Rowell, Jonathan L Zheng, Huihuo Robinson, Richard D Gu, Junsi Kirilin, Alexey Rozeveld, Steve Ercius, Peter Scott, Mary Department of Materials Science and Engineering University of Michigan Ann Arbor MI Applied Physics Program University of Michigan Ann Arbor MI Chan Zuckerberg Initiative Redwood City CA Rowland Institute at Harvard Cambridge MA. Mathematics and Computer Science Division Argonne National Laboratory Lemont IL Advanced Photon Source Facility Argonne National Laboratory Lemont IL Department of Materials Science and Engineering U.C. Berkeley Berkeley CA National Center for Electron Microscopy Molecular Foundry Berkeley CA Department of Chemistry and Chemical Biology Cornell University Ithaca NY Argonne Leadership Computing Facility Argonne National Laboratory Lemont IL Dow Chemical Co. Terneuzen Netherlands Dow Chemical Co. Midland MI

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Alkali Chloride Adducts of Acyclic Acylaluminum: Synthesis, Structure, and Reactivity Studies

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Angewandte Chemie 2023年第30期135卷

作者： Dr. Genfeng Feng Prof. Dr. Makoto Yamashita Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Aichi Japan Integrated Research Consortium on Chemical Science (IRCCS) Nagoya University Tokai National Higher Education and Research System Furo-cho Chikusa-ku Nagoya 464-8602 Japan

Two acyclic acylaluminums and one cyclic acylaluminum dimer were synthesized by reaction of the recently reported Al-anion with acyl chloride. The reaction of the acylaluminums with TMSOTf and DMAP gave a ring-expanded iminium-substituted aluminate and a 2-C−H cleaved product. In the reaction of acylaluminums toward C=O and C=N bonds, acyclic acylaluminums reacted as an acyl nucleophile, while the cycilc dimer showed no reactivity. Amide-bond forming ligation using acyclic acylaluminums and hydroxylamines was further demonstrated. Throughout the study, acyclic acylaluminums exhibited higher reactivity than that of the cyclic dimer.

关键词： Acyl Anion Aluminum Carbonyl Compounds Nucleophile Ring Expansion

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Insights into the Distinct Behaviors between Bifunctional and Binary Organoborane Catalysts through Terpolymerization of Epoxide, CO2, and Anhydride

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Angewandte Chemie 2024年第27期136卷

作者： Rui Xie Yuhui Wang Shuai Li Bo Li Jie Xu Jinqian Liu Yuchen He Guan-Wen Yang Guang-Peng Wu MOE Key Laboratory of Macromolecular Synthesis and Functionalization Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 Zhejiang P. R. China College of Material Chemistry and Chemical Engineering Key Laboratory of Organosilicon Chemistry and Material Technology Ministry of Education Hangzhou Normal University Hangzhou 311121 Zhejiang P. R. China Shaanxi Coal Chemical Industry Technology Research Institute Co. Ltd. Xi'an 710100 Shaanxi P. R. China

Alkyl borane compounds-mediated polymerizations have expanded to Lewis pair polymerization, free radical polymerization, ionic ring-opening polymerization, and polyhomologation. The bifunctional organoborane catalysts that contain the Lewis acid and ammonium or phosphonium salt in one molecule have demonstrated superior catalytic performance for ring-opening polymerization of epoxides and ring-opening copolymerization of epoxides and CO 2 than their two-component analogues, i.e., the blend of organoborane and ammonium or phosphonium salt. To explore the origin of the differences of the one-component and two-component organoborane catalysts, here we conducted a systematic investigation on the catalytic performances of these two kinds of organoborane catalysts via terpolymerization of epoxide, carbon dioxide and anhydride. The resultant terpolymers produced independently by bifunctional and binary organoborane catalyst exhibited distinct microstructures, where a series of gradient polyester-polycarbonate terpolymers with varying polyester content were afforded using the bifunctional catalyst, while tapering diblock terpolymers were obtained using the binary system. The bifunctional catalyst enhances the competitiveness of CO 2 insertion than anhydride, which leads to the premature incorporation of CO 2 into the polymer chains and ultimately results in the formation of gradient terpolymers. DFT calculations revealed the role of electrostatic interaction and charge distribution caused by intramolecular synergistic effect for bifunctional organoborane catalyst.

关键词： organoborane bifunctional catalysts ring-opening polymerization copolymerization block copolymer

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The Impact of Supersaturated Electrode on Heterogeneous Lithium Nucleation and Growth Dynamics

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Angewandte Chemie 2024年第48期136卷

作者： Jimin Park Ji In Jung Son Ha Do Hyun Kim Hyun-Seok Jang Prof. Byung Hoon Kim Prof. Hyung-Kyu Lim Prof. Hyoung-Joon Jin Prof. Young Soo Yun KU-KIST Graduate School of Converging Science and Technology Korea University 145 Anam-ro Seongbuk-gu 02841 Seoul Republic of Korea Program in Environmental and Polymer Engineering Inha University 100 Inha-ro Michuhol-gu 22212 Incheon Republic of Korea Department of Physics Incheon National University 22012 Incheon Republic of Korea Division of Chemical Engineering and Bioengineering Kangwon National University 24341 Chunchenon Gangwon-do South Korea Department of Polymer Science and Engineering Inha University 100 Inha-ro Michuhol-gu 22212 Incheon Republic of Korea Department of Integrative Energy Engineering Korea University 145 Anam-ro Seongbuk-gu 02841 Seoul Republic of Korea

The concept of a lithiophilic electrode proves inadequate in describing carbon-based electrode materials due to their substantial mismatch in surface energy with lithium metal. However, their notable capacity for lithium chemisorption can increase active lithium concentration required for nucleation and growth, thereby enhancing the electrochemical performance of lithium metal anodes (LMAs). In this study, we elucidate the effects of the supersaturated electrode which has high active lithium capacity around equilibrium lithium potential on LMAs through an in-depth electrochemical comparison using two distinct carbon electrode platforms with differing carbon structures but similar two-dimensional morphologies. In the supersaturated electrode, both the dynamics and thermodynamic states involved in lithium nucleation and growth mechanisms are significantly improved, particularly under continuous current supply conditions. Furthermore, the chemical structures of the solid-electrolyte-interface layers (SEIs) are greatly influenced by the elevated surface lithium concentration environment, resulting in the formation of more conductive lithium-rich SEI layers. The improved dynamics and thermodynamics of surface lithium, coupled with the formation of enhanced SEI layers, contribute to higher power capabilities, enhanced Coulombic efficiencies, and improved cycling performances of LMAs. These results provide new insight into understanding the enhancements in heterogeneous lithium nucleation and growth kinetics on the supersaturated electrode.

关键词： supersaturated electrode lithiophilic electrode carbon electrode lithium metal anode lithium nucleation and growth

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Manifestations of metastable criticality in the long-range structure of model water glasses

arXiv

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arXiv 2021年

作者： Gartner, Thomas E. Torquato, Salvatore Car, Roberto Debenedetti, Pablo G. Department of Chemistry Princeton University PrincetonNJ United States Department of Physics Princeton University PrincetonNJ United States Program in Applied and Computational Mathematics Princeton University PrincetonNJ United States Princeton Institute for the Science and Technology of Materials Princeton University PrincetonNJ United States Department of Chemical and Biological Engineering Princeton University PrincetonNJ United States

Much attention has been devoted to water’s metastable phase behavior, including polyamorphism (multiple amorphous solid phases), and the hypothesized liquid-liquid transition and associated critical point. However, the possible relationship between these phenomena remains incompletely understood. Using molecular dynamics simulations of the realistic TIP4P/2005 model, we found a striking signature of the liquid-liquid critical point in the structure of water glasses, manifested as a pronounced increase in long-range density fluctuations at pressures proximate to the critical pressure. By contrast, these signatures were absent in glasses of two model systems that lack a critical point. We also characterized the departure from equilibrium upon vitrification via the non-equilibrium index;water-like systems exhibited a strong pressure dependence in this metric, whereas simple liquids did not. These results reflect a surprising relationship between the metastable equilibrium phenomenon of liquid-liquid criticality and the non-equilibrium structure of glassy water, with implications for our understanding of water phase behavior and glass physics. Our calculations suggest a possible experimental route to probing the existence of the liquid-liquid transition in water and other fluids. © 2021, CC BY.

关键词： Criticality (nuclear fission)

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Improving dye-sensitized solar cell longevity: An aerogel encapsulation approach

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Journal of the Taiwan Institute of chemical Engineers 2025年 174卷

作者： Savisha Mahalingam Abreeza Manap Kam Sheng Lau Dita Floresyona Chin Hua Chia Nurfanizan Afandi Puvaneswaran Chelvanathan Faiz Arith Agung Nugroho Institute of Sustainable Energy Universiti Tenaga Nasional Jalan IKRAM-UNITEN 43000 Kajang Selangor Malaysia Materials Science Program Faculty of Science and Technology Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Department of Chemical Engineering Faculty of Industrial Technology Universitas Pertamina Jalan Teuku Nyak Arief Simprug Kebayoran Lama Jakarta 12220 Indonesia Department of Mechanical Engineering College of Engineering Universiti Tenaga Nasional Jalan IKRAM-UNITEN 43000 Kajang Malaysia Solar Energy Research Institute (SERI) Universiti Kebangsaan Malaysia 43600 Bangi Selangor Malaysia Faculty of Electronics and Computer Technology and Engineering Universiti Teknikal Malaysia Melaka Hang Tuah Jaya Durian Tunggal 76100 Melaka Malaysia

The primary challenge in dye-sensitized solar cells (DSSCs) is electrolyte leakage, compromising long-term stability and performance. Alternative electrolytes and encapsulation strategies have been explored to address this. In this study, we propose using nitrogen, fluorine, and sulfur-doped reduced graphene oxide (NSF-rGO) aerogel as an electrolyte encapsulator within DSSCs. The NSF-rGO aerogel was synthesized using a one-pot hydrothermal technique and serves to trap the liquid electrolyte, enhancing cell stability while maintaining conductivity. Although the initial power conversion efficiency of the NSF-rGO-based DSSC was lower than that of the conventional DSSC, it demonstrated significantly improved long-term stability. After two years, the efficiency drop in the NSF-rGO encapsulated DSSC was notably less than in the conventional design, indicating effective electrolyte retention and resistance to degradation. These results suggest that NSF-rGO aerogel encapsulation is a promising strategy for extending the operational lifespan of DSSCs and contributing to more sustainable energy solutions.

关键词： Conductivity Electrical properties Energy Heteroatoms

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Gold Nanoparticle Decorated Bismuth Vanadate Casting on Screen-Printed Electrode for Chlortetracycline Detection in Tap Water

SSRN

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SSRN 2024年

作者： Ngo, Duy Ba Gopi, Praveen Kumar Rajkumar, Muniyandi Chen, Shen-Ming Rijiravannich, Patsamon Khownarumit, Porntip Somasundrum, Mithran Surareungchai, Werasak Bangkhuntien-chaitalay Rd. Bangkok10150 Thailand Analytical Sciences and National Doping Test Institute Mahidol University Rama VI Rd. Bangkok10400 Thailand Electroanalysis and Bioelectrochemistry Lab Department of Chemical Engineering and Biotechnology National Taipei University of Technology No.1 Section 3 Chung-Hsiao East Rd. Taipei106 Taiwan Bioscience and System Biology Research Team National Center for Genetic Engineering and Biotechnology National Sciences and Technology Development Agency at KMUTT Bangkhuntien-chaitalay Rd. Bangkok10150 Thailand Pilot Plant Development and Training Institute KMUTT Bangkhuntien-chaitalay Rd. Bangkok10150 Thailand Nanoscience and nanotechnology graduate program Faculty of Science KMUTT Pracha Uthit Rd. Bangkok10140 Thailand PSG College of Arts and Science Civil Aerodrome Post Tamil Nadu Coimbatore641014 India Quarter 6 Linh Trung Ward Thu Duc City Ho Chi Minh City720400 Viet Nam

Background Chlortetracycline (CTC) belongs to the class of tetracycline’s compounds, which is known for its antibacterial activity. CTC was largely consumed by farm animals than humans, which leads to the growth antibiotic – resistant bacteria and environmental contamination. So far no one reported the electrochemical detection and determination of CTC by using AuNPs@BiVO4 composite. Some reports have been reported using conventional chromatography which is most expensive, time-consuming and highly equipped method. Results Here, we report a simple method for preparing gold nanoparticle decorated bismuth vanadate (AuNPs@BiVO4), which was dropped cast on a screen-printed carbon electrode (SPCE). The AuNPs@BiVO4 and AuNPs@BiVO4/SPCE materials were characterized using TEM, SEM-EDX, XPS, DLS, ELS, EIS, and CV. The as-prepared AuNPs@BiVO4/SPCE was used to detect and determine chlortetracycline (CTC) by different pulse potentials in phosphate buffer pH 7.0. The electrode possessed a wide linear range of 0.99 – 19.06 µM, with obtained LOD = 0.15 µM, LOQ = 0.49 µM, and sensitivity = 0.059 μA μM-1 cm-2. It also exhibited good selectivity, stability, and repeatability, recovering 87.14% - 100% for detecting CTC in Mili Q and tap water. Significance Facile and rapid synthesis of AuNPs@BiVO4 nanocomposite film modified electrode at physiological pH conditions has been prepared and A highly electrochemical detection and determination of CTC using AuNPs@BiVO4 nanocomposite film has been developed for the first time. Thus, the proposed electrode could be applied for the detection and determination of CTC in water sources and has the potential to be used for real sample analysis. © 2024, The Authors. All rights reserved.

关键词： Nanocomposites

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