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46th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2024

作者： Richardson, Hayley Thompson, Brendan Peterson, Kaila Songkakul, Tanner Sode, Koji Daniele, Michael Bozkurt, Alper Pavlidis, Spyridon Nc State University Department of Materials Science and Engineering RaleighNC United States Nc State University Department of Electrical Engineering RaleighNC United States Nc State University Joint Department of Biomedical Engineering RaleighNC United States University of North Carolina Chapel HillNC United States

ISBN: (纸本)9798350371499

Biochemical monitoring of sweat through vigilant wearable systems offers new opportunities for improved stress management. A low-power biochemical sensing platform has been developed to perform potentiometric sensing using extended gate field-effect transistors (EGFET) for wearable biochemical monitoring. In vitro validation of the EGFET-enabled electrochemistry was achieved by testing pH and electrolyte concentrations. As a model biochemical analyte and important stress biomarker, neuropeptide Y (NPY) detection was demonstrated with this sensing platform by using an anti-NPY aptamer. The sensor and system operation were optimized to meet the sensitivity requirements to monitor NPY in sweat in a range of 100 fM to 100 nM by comparing different gate drive voltages. The sensing electronics power was optimized to enable longer term operation allowing 11 days of continuous monitoring on a single charge using a 3.8 g 150 mAh lithium polymer battery. The sensitivity of this custom designed electronics system was found to be similar to a commercial benchtop system when the same NPY aptamer-based sensor was tested in artificial sweat. The results indicated the largest current signal change of 34.3% for 100 nM NPY compared to the baseline current. Selectivity was measured against the stress biomarker cortisol. The measurements were achieved with a resolution of 13.59 μA/decade concentration change of NPY. These initial results pave the way towards vigilant sensing of stress biomarkers in sweat using a wearable system. © 2024 IEEE.

关键词： Biomarkers

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Anomalous properties of spark plasma sintered boron nitride solids

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materials Today 2025年 86卷 42-51页

作者： Biswas, Abhijit Serles, Peter Alvarez, Gustavo A. Schimpf, Jesse Hache, Michel Kong, Jonathan Demingos, Pedro Guerra Yuan, Bo Pieshkov, Tymofii S. Li, Chenxi Puthirath, Anand B. Gao, Bin Gray, Tia Zhang, Xiang Murukeshan, Jishnu Vajtai, Robert Dai, Pengcheng Singh, Chandra Veer Howe, Jane Zou, Yu Martin, Lane W. Clancy, James Patrick Tian, Zhiting Filleter, Tobin Ajayan, Pulickel M. Department of Materials Science and Nanoengineering Rice University HoustonTX77005 United States Department of Mechanical & Industrial Engineering University of Toronto 5 King's College Road TorontoM5S 3G8 Canada Sibley School of Mechanical and Aerospace Engineering Cornell University IthacaNY14853 United States Department of Materials Science and Engineering University of California Berkeley94720 United States Department of Materials Science and Engineering University of Toronto 184 College St TorontoM5S 3E4 Canada Department of Physics and Astronomy McMaster University HamiltonL8S 4M1 Canada Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Materials Sciences Division Lawrence Berkeley National Laboratory Berkeley94720 United States

Hexagonal boron nitride (h-BN) is a brittle ceramic with a layered structure, however, recent experiments have suggested that inter-layer structural engineering could be key to new structural and functional properties. Here we report the scalable bulk synthesis of high-density crystalline h-BN solids, by using high-temperature spark plasma sintering (SPS) of h-BN powders, which show high values of mechanical strength, ductility, dielectric constant, thermal conductivity, and exceptional neutron radiation shielding capability. Through exhaustive characterizations we reveal that SPS induces non-basal plane crystallinity, twisting of layers, and facilitates inter-grain fusion with a high degree of in-plane alignment across macroscale dimensions, resulting in near-theoretical density and improved properties. Our findings highlight the importance of material design, via new approaches such as layer twisting and interlayer interconnections, to create novel ceramics with properties that could go beyond their intrinsic limits. © 2025

关键词： Ductility

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A Comparative Study of the Effect of Compounding Methods and Processing of PLA/GNPs on the Micromorphology and Electrical Conductivity 38

A Comparative Study of the Effect of Compounding Methods and...

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38th Technical Conference of the American Society for Composites, ASC 2023

作者： Anurakparadorn, Kanat Taub, Alan Department of Materials Science and Engineering Macromolecular Science and Engineering Program University of Michigan 2300 Hayward St Ann ArborMI48109 United States Department of Mechanical Engineering University of Michigan 2350 Hayward St Ann ArborMI48109 United States

ISBN: (纸本)9781605956916

In this work, the effects of different compounding and processing techniques on the DC electrical conductivity and density of polylactic acid (PLA)/graphene nanoplatelets (GNPs) composites were studied. It is found from the study that compounding by solution mixing via an ultrasonication technique can provide slightly higher DC electrical conductivity after compression molding than mixing through a twin-screw extruder due to better dispersion quality. In addition, a composite pellet from twin screw extrusion showed a slight increase in DC electrical conductivity and anisotropy when processed by filament extrusion due to the shear alignment of GNPs during the extrusion. The fused deposition modeling (FDM) process yields high anisotropy because the crystallization along the printing path allows gaps and polymer coating between the extruded lines and layers. It was found that the 7.5 wt% GNPs composites exhibited the best properties because it provides the best dispersion quality to meet the percolation threshold. Furthermore, the micromorphology of each sample was also studied to observe the dispersion and porosity inside the composite provided by each fabrication technique. This study can be used as a reference for compounding and processing techniques. © 2023 by DEStech Publications, Inc. and American Society for Composites. All rights reserved.

关键词： Mixing

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INTER- AND INTRA-LAMINAR PROPERTIES OF AN AFP POST-PROCESSED THERMOPLASTIC COMPOSITE

INTER- AND INTRA-LAMINAR PROPERTIES OF AN AFP POST-PROCESSED...

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SAMPE 2024 Conference and Exhibition

作者： Yap, Timothy S. Heathman, Nathaniel M. Kirchhoff, Joseph G. Tehrani, Mehran Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX United States Department of Structural Engineering University of California La Jolla San DiegoCA United States Program in Materials Science and Engineering University of California La Jolla San DiegoCA United States

ISBN: (纸本)9781934551455

Transitioning to high-performance thermoplastic composites (TPCs) carries great potential due to their enhanced toughness, ease of repairability, and the possibility of bypassing the need for autoclaves that are essential for curing thermosetting composites. Full consolidation of parts may be achieved in-situ using automated fiber placement (AFP) at slow rates;alternatively, with higher rates, consolidation may only occur following vacuum-bag oven processing (vacuum-bag only or VBO) or compression molding (CM) post-processing. This study investigates the CM of AFP carbon fiber LM-PAEK™ composites at a low pressure of 0.2 MPa to simulate VBO post-processing, focusing on their intra- and inter-laminar behavior. Short-beam strength, fracture toughness modes I and II, and transverse tensile and compressive samples were manufactured via AFP using a fast layup rate, followed by low-pressure CM. As compared to previous studies, post-processing resulted in greater interlaminar bonding. This study demonstrates the viability of TPCs for the next generation of aerospace structures with a relatively simple oven post-processing. © 2024 Soc. for the Advancement of Material and Process engineering. All rights reserved.

关键词： Compression molding

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Fluorine-Free Cosolvent Chemistry Empowering Sodium-Sulfurized Polyacrylonitrile Batteries

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Advanced Energy materials 2025年第0期

作者： Pai, Min-Hao Manthiram, Arumugam Materials Science and Engineering Program & Walker Department of Mechanical Engineering The University of Texas at Austin AustinTX78712 United States

Localized high-concentration electrolytes (LHCE) show great promise for room-temperature sodium-sulfur batteries. However, the majority of diluents in LHCE systems consist of fluorinated ethers, which are not only dense and expensive but also demonstrate poor reductive stability with sodium metal. Herein, a low-density, non-fluorinated ether electrolyte is presented that demonstrates localized high-concentration behavior. This feature is driven by the weak solvating capabilities of 1,2-dimethoxypropane (DMP) and the ultra-weak solvating nature of cyclopentyl methyl ether (CPME). Impressively, the fluorine-free CPME cosolvent acts as a diluent within the electrolyte. Therefore, the electrolyte achieves a tailored solvation structure characterized by anion-rich species, which fosters the development of a resilient inorganic-rich SEI with superior Na-ion transport. Consequently, with a high sulfur-content sulfurized polyacrylonitrile (SPAN, S content > 45% in SPAN) loading of 4.4 mg cm⁻2 (sulfur loading: 2 mg cm⁻2) and a low electrolyte-to-SPAN ratio of 9 µL mg⁻¹ (E/SPAN = 9), the Na-SPAN cell demonstrates remarkable reversibility of 530 mA h gsulfur⁻¹ after 200 cycles at C/5 rate. This performance surpasses the majority of state-of-the-art Na-SPAN ether-based electrolyte systems reported to date. Hence, this work presents a novel approach for designing cost-effective, high-performance electrolytes for stable, practical Na-SPAN batteries. © 2025 Wiley-VCH GmbH.

关键词： Sodium-ion batteries

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Functional nucleic acids with synthetic sugar or nucleobase moieties

Advanced Agrochem

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Advanced Agrochem 2023年第3期2卷 236-245页

作者： Ze Zhang Siqi Chen Zhe Li Hanyang Yu State Key Laboratory of Coordination Chemistry Department of Biomedical EngineeringCollege of Engineering and Applied SciencesChemistry and Biomedicine Innovation Center(ChemBIC)Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjingJiangsu210023China State Key Laboratory of Analytical Chemistry for Life Science Department of Biomedical EngineeringCollege of Engineering and Applied SciencesNanjing UniversityNanjing210023China

Functional nucleic acids including aptamers and DNAzymes are a class of valuable molecular tool for ***,DNA and RNA aptamers and catalysts suffer from low biological stability and limited chemical ***-nucleic acids(XNAs)refer to nucleic acid analogues containing sugar moieties that are structurally distinct from DNA and RNA and possess advantageous *** this article,we first focus on two types of XNAs,threose nucleic acid(TNA)and 2’-fluoroarabinose nucleic acid(FANA),and summarize recent in vitro selections of TNA and FANA aptamers and *** then review three classes of unnatural base pairs(UBPs)and highlight examples of UBP-containing DNA aptamers and ***,we briefly describe an XNA-modified DNAzyme 10–23(X10-23)and its application in RNA knockdown and virus *** XNAs provide important chemical biology tools for biomedical research and future interdisciplinary collaboration will boost XNA basic research and clinical translation.

关键词： properties. sugar base

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Sensitivity improvement of fluoroalkylated EUV resist with electron-rich vinyl units 41

Sensitivity improvement of fluoroalkylated EUV resist with e...

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Advances in Patterning materials and Processes XLI 2024

作者： Kim, Gayoung Ku, Yejin Lee, Jin-Kyun Kim, Jiho Park, Byeong-Gyu Lee, Sangsul Jang, Yu Ha Jung, Byung Jun Koh, Chawon Nishi, Tsunehiro Kim, Hyun-Woo Program in Environment and Polymer Engineering Inha University Incheon22212 Korea Republic of Department of Polymer Science and Engineering Inha University Incheon22212 Korea Republic of Pohang Accelerator Laboratory Postech Pohang37673 Korea Republic of Department of Materials Science and Engineering University of Seoul Seoul02504 Korea Republic of Samsung Electronics Co. Ltd. Semiconductor R&d Center Suwon18448 Korea Republic of Department of Materials Science and Engineering Yonsei University Seoul03722 Korea Republic of

ISBN: (纸本)9781510672208

In this study, we present a method to enhance the sensitivity of fluorinated EUV resists by leveraging the rapid coupling reaction between electrophilic carbon radicals and electron-rich alkenes. To validate the impact of the vinyl groups, DVS-HNF was synthesized by introducing fluorinated alkyl chains and silyl vinyl functional groups into the model compound. Additionally, TMS-HNF and EDMS-HNF, which do not contain a vinyl moiety, were synthesized for comparison. To evaluate the patterning properties of the three materials, e-beam lithography experiments were conducted, resulting in the formation of negative-tone patterns for all three materials. Comparing sensitivities, DVS-HNF with two vinyl moieties exhibited the most excellent sensitivity, confirming the effective collaboration between fluorinated alkyl radicals and vinyl groups. After performing an EUV lithography experiment on DVS-HNF, it was confirmed that a 30 nm negative-tone pattern was successfully formed with excellent sensitivity. These results substantiate the potential of the single-component molecular resist for high performance EUV lithography. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Extreme ultraviolet lithography

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Dynamic active sites on plasma engraved Ni hydroxide for enhanced electro-catalytic urea oxidation

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Journal of Energy Chemistry 2022年第8期31卷 150-158,I0005页

作者： Dan Li Yuefeng Zhang Xiaomin Zhou Chao Huang Ying Wen Liangliang Liu Qingwei Li Yue Xu Yuzheng Wu Qingdong Ruan Yinghe Ma Fangyu Xiong Dezhi Xiao Pei Liu Guomin Wang Babak Mehrjou Bin Wang Hao Li Rongsheng Chen Hongwei Ni Zhiyuan Zeng Paul K.Chu Department of Physics Department of Materials Science and Engineeringand Department of Biomedical EngineeringCity University of Hong KongTat Chee AvenueKowloon 999077Hong KongChina The State Key Laboratory of Refractories and Metallurgy Wuhan University of Science and TechnologyWuhan 430081HubeiChina Catalysis Theory Center Department of PhysicsTechnical University of Denmark2800 Kongens LyngbyDenmark

The urea oxidization reaction(UOR)is an important anodic reaction in electro-catalytic energy ***,the sluggish reaction kinetics and complex catalyst transformation in electrocatalysis require activity improvement and better mechanistic understanding of the state-of-the-art Ni(OH)_(2) ***,by utilizing low-temperature argon(Ar)plasma processing,tooth-wheel Ni(OH)_(2) nanosheets self-supported on Ni foam(Ni(OH)_(2)-Ar)are demonstrated to have improved UOR activity compared to conventional Ni(OH)_(2).The theoretical assessment confirms that the edge has a smaller cation vacancy formation energy than the basal plane,consequently explaining the structural *** and quasi-operando methods are employed to investigate the dynamic evolution of the Ni(OH)_(2) film in *** crucial dehydrogenation products of Ni(OH)_(5)O^(-)intermediates are identified to be stable on the etched edge and explain the enhanced UOR in the low potential *** addition,the dynamic active sites are monitored to elucidate the reaction mechanism in different potential ranges.

关键词： Urea oxidization reaction Ni hydroxide Plasma processing Dehydrogenation Active site

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A new class of high-entropy M_(3)B_(4) borides

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Journal of Advanced Ceramics 2021年第1期10卷 166-172页

作者： Mingde QIN Qizhang YAN Yi LIU Jian LUO Department of NanoEngineering Program of Materials Science and EngineeringUniversity of CaliforniaSan DiegoLa JollaCA92093USA

A new class of high-entropy M3B4 borides of the Ta_(3)B_(4)-prototyped orthorhombic structure has been synthesized in the bulk form for the first *** with compositions of(V0.2Cr0.2Nb0.2Mo0.2Ta0.2)3B4 and(V0.2Cr0.2Nb0.2Ta0.2W0.2)_(3)B_(4) were fabricated via reactive spark plasma sintering of high-energy-ball-milled elemental boron and metal *** sintered specimens were〜98.7%in relative densities with virtually no oxide contamination,albeit the presence of minor(4-5 vol%)secondary high-entropy M5B6 *** that Mo_(3)B_(4) or W_(3)B_(4) are not stable phase,20%of M03B4 and W3B4 can be stabilized into the high-entropy M3B4 *** hardness was measured to be 18.6 and 19.8 GPa at a standard load of 9.8 *** work has further expanded the family of different structures of high-entropy ceramics reported to date.

关键词： high-entropy ceramics high-entropy borides reactive sintering spark plasma sintering Ta_(3)B_(4)-prototyped orthorhombic structure

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A Physical-Based Artificial Neural Networks Compact Modeling Framework for Emerging FETs

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IEEE Transactions on Electron Devices 2024年第1期71卷 223-230页

作者： Yang, Ya-Shu Li, Yiming Kola, Sekhar Reddy Reddy National Yang Ming Chiao Tung University Parallel and Scientific Computing Laboratory The Institute of Communications Engineering Hsinchu300093 Taiwan National Yang Ming Chiao Tung University Parallel and Scientific Computing Laboratory Institute of Communications Engineering Institute of Biomedical Engineering Department of Electronics and Electrical Engineering Hsinchu300093 Taiwan National Yang Ming Chiao Tung University Parallel and Scientific Computing Laboratory Electrical Engineering and Computer Science International Graduate Program Hsinchu300093 Taiwan

We report a compact modeling framework based on the Grove-Frohman (GF) model and artificial neural networks (ANNs) for emerging gate-all-around (GAA) MOSFETs. The framework consists of two ANNs;the first ANN constructed with the drain current model not only can capture the main trend of device I - V characteristics but also can predict its variation even when the amount of training data for the ANN is insufficient or outside the range of applied biases. The second one is then designed to improve the model accuracy by further minimizing the errors between the target and the model outputs. We implement the proposed framework to accurately model emerging GAA nanosheet (NS) MOSFETs and complementary FETs (CFETs) without suffering from divergent issues in circuit simulation. In addition, nonphysical behaviors, such as nonzero current at zero bias, do not occur in the modeling framework. Compared to recently reported machine-learning (ML) models, our approach can achieve a similar level of model accuracy with merely 20% amount of the training data. © 1963-2012 IEEE.

关键词： Neural networks

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