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Preparation and Characterization of Nanopatterned Polycaprolactone/Cellulose Nanocrystal Composite Membranes for Cardiovascular Tissue engineering 15

Preparation and Characterization of Nanopatterned Polycaprol...

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15th IEEE International Conference on Nano/Molecular Medicine and engineering, NANOMED 2021

作者： Batta-Mpouma, Joseph Kandhola, Gurshagan Kuczwara, Patrick Chivers, Cody Kim, Woochan Jensen, Hanna Kim, Jangho Jensen, Morten Kim, Jin-Woo Materials Science & Engineering Program Institute For Nanoscience & Engineering University of Arkansas Department of Biological & Agricultural Engineering FayettevilleAR United States Engineering And Institute For Nanoscience & Engineering University of Arkansas Department of Biological & Agricultural FayettevilleAR United States Institute For Nanoscience & Engineering University of Arkansas FayettevilleAR United States Chonnam National University Department of Rural & Biosystems Engineering Gwangju Korea Republic of University of Arkansas Department of Biomedical Engineering FayettevilleAR United States

ISBN: (纸本)9781665458566

Cardiac tissue exhibits very low regenerative capacity. Polymeric tissue scaffolds designed for repair of damaged cardiac tissue need to have the right balance of mechanical and biological characteristics that are necessary to withstand inherent stresses generated by cyclic contraction of cardiomyocytes and to promote cell attachment and growth. Polycaprolactone (PCL), a biocompatible polymer with low biodegradability, is a promising material to develop scaffolds for tissue engineering (TE). However, its high stiffness limits its use as a matrix for cardiovascular TE. In this work, we evaluated the physical, mechanical and surface properties of PCL and cellulose nanocrystal (CNC) composite membranes, imprinted with a three-dimensional groove-ridge pattern, and their potential for cardiomyocyte adhesion and growth. This work demonstrates the impact of (a) incorporating CNCs within the PCL matrix and (b) patterning the membrane, on the surface roughness, wettability, and mechanical properties of composites, with an aim to alleviate the limitations of pure PCL scaffolds for cardiac TE applications. © 2021 IEEE.

关键词： Biocompatibility

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Supplementary information for "Low-loss silicon nitride Kerr-microresonators fabricated with metallic etch masks via metal lift-off"

arXiv

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arXiv 2025年

作者： Colación, Gabriel M. Rukh, Lala Buck, Franco Drake, Tara E. Optical Science & Engineering Program University of New Mexico AlbuquerqueNM87106 United States Center for High Technology Materials University of New Mexico AlbuquerqueNM87106 United States Department of Physics & Astronomy University of New Mexico AlbuquerqueNM87106 United States

Stoichiometric silicon nitride has emerged as a widely used integratedphotonic material owing to its high index of refraction, nonlinear opticalproperties, and broad transparency window spanning visible to mid-IRfrequencies. However, silicon nitride is generally more resistant to reactiveion etching than are typical etch masks made of polymer-based resist. Thisnecessitates resist layers that are significantly thicker than the siliconnitride and results in mask patterns which are tall and narrow. Thesehigh-aspect-ratio patterns inhibit the plasma transport of reactive ionetching, which leads to difficulties in accurately reproducing dimensions andcreating well-defined, vertical waveguide sidewalls. In this work, we overcomethese challenges by developing a metallic etch mask that provides a 30:1nitride-to-metal etch rate ratio, representing a near 20-fold reduction in therequired mask thickness. We demonstrate the quality of this technique byetching microring resonators with near-vertical waveguide sidewalls andintrinsic quality factors of over 1 million. Leveraging the low optical loss ofour resonators, we generate optical frequency combs with more than an octave ofbandwidth and dual dispersive waves. These results establish metal lift-off asa viable and easy-to-implement technique capable of producing low optical losswaveguides. © 2025, CC BY.

关键词： Aspect ratio

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Field-induced spin polarization in the lightly Cr-substituted layered antiferromagnet NiPS3

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Physical Review B 2024年第18期109卷 184405-184405页

作者： Rabindra Basnet Dinesh Upreti Taksh Patel Santosh Karki Chhetri Gokul Acharya Md Rafique Un Nabi M. M. Sharma Josh Sakon Mansour Mortazavi Jin Hu Department of Chemistry and Physics University of Arkansas at Pine Bluff Pine Bluff Arkansas 71603 USA Department of Physics University of Arkansas Fayetteville Arkansas 72701 USA Fayetteville High School Fayetteville Arkansas 72701 USA MonArk NSF Quantum Foundry University of Arkansas Fayetteville Arkansas 72701 USA Department of Chemistry and Biochemistry University of Arkansas Fayetteville Arkansas 72701 USA Materials Science and Engineering Program Institute for Nanoscience and Engineering University of Arkansas Fayetteville Arkansas 72701 USA

Tuning magnetic properties in layered magnets is an important route to realize novel phenomenon related to two-dimensional (2D) magnetism. Recently, tuning antiferromagnetic (AFM) properties through substitution and intercalation techniques has been widely studied in MPX3 compounds. Interesting phenomena, such as diverse AFM structures and even the signatures of ferrimagnetism, have been reported. However, long-range ferromagnetic (FM) ordering has remained elusive. In this work, we explored the magnetic properties of the Cr-substituted NiPS3. We found that Cr substitution is extremely efficient in controlling spin orientation in NiPS3. Our study reveals a field-induced spin polarization in lightly (9%) Cr-substituted NiPS3, which is likely attributed to the attenuation of AFM interactions and magnetic anisotropy due to Cr doping. Our work provides a possible strategy to achieve FM phase in AFM MPX3, which could be useful for investigating 2D magnetism as well as potential device applications.

关键词： Antiferromagnetism Magnetic anisotropy Magnetic order Magnetic phase transitions 2-dimensional systems Antiferromagnets Van der Waals systems Ion implantation Magnetization measurements

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Performance Enhancement of Electrochemiluminescence with the Immunosensor Controlled Using Magnetized Masks for the Determination of Epithelial Cancer Biomarker EpCAM

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Analytical Chemistry 2023年第2期95卷 986-993页

作者： Huang, Chun-Yao Lin, Feng-Yen Chang, Chi-Jung Lu, Chien-Hsing Chen, Jem-Kun Taipei Heart Institute Taipei Medical University 250 Wu-Hsing Street Taipei110 Taiwan Division of Cardiology and Cardiovascular Research Center Taipei Medical University Hospital 252 Wu-Hsing Street Taipei110 Taiwan Department of Internal Medicine School of Medicine College of Medicine Taipei Medical University 250 Wu-Hsing Street Taipei110 Taiwan Department of Biomedical Sciences and Engineering National Central University 300 Zhongda Road Taoyuan City320317 Taiwan Department of Materials Science and Engineering National Taiwan University of Science and Technology 43 Sec. 4 Keelung Road Taipei106 Taiwan Department of Chemical Engineering Feng Chia University 100 Wenhwa Road Taichung40724 Taiwan Department of Obstetrics and Gynecology Taichung Veterans General Hospital 1650 Taiwan Boulevard Sect. 4 Taichung40705 Taiwan Institute of Biomedical Sciences Ph.D. Program in Translational Medicine Rong-Hsing Research Center for Translational Medicine National Chung-Hsing University Taichung940227 Taiwan

The performance of an electrochemiluminescence (ECL) immunosensor was improved with a particle gradient. SiO2-coated magnetic beads were adopted as nanocarriers for gradient manipulation and immobilized with the primary antibody. Cadmium telluride quantum dots were coated with a layer of protein G for conjugation and orientation of the secondary antibody as signal labels. ECL immunosensor gradients on the electrode were formed by magnetolithography (ML) with magnetized nickel masks of column and stripe arrays. The immunosensor generally aggregated as an island on the substrate, leading to a decrease of efficiency in the characteristic signals. Stripe arrays of magnetized nickel were designed to generate cylindrical magnetic flux on the substrate to improve the particle manipulation with the gradient. Various gradients of the sandwich-structured immunosensor substantially affected the electrochemical performance. Compared to the gradient-free immunosensor, the gradient of the immunosensor generated by ML using a 3 μm stripe array mask enhanced the ECL intensity ∼2.2 times. The results of quantification of epithelial cell adhesion molecules (EpCAM) with the gradient immunosensor showed a broad linear range (15-420 pg mL-1), a low limit of detection (5.5 pg mL-1), and high reliability for EpCAM-spiked serum samples, indicating that the immunosensor gradient substantially enhances the performance of the ECL assay. © 2022 American Chemical Society.

关键词： Immunosensors

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Statistical Analysis of Polyester Resin Composite Reinforced with Miriti Fibers Braided Using Crochet Technique

SSRN

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SSRN 2023年

作者： Freires, Altairley M. de Corrêa, Alessandro C. Ribeiro, Mauricio M. Cardoso, Silmara M. da Rodrigues, Jean S. Silva, Douglas Santos Junio, Raí Felipe Pereira Monteiro, Sergio Neves Federal Institute of Education Science and Technology of Pará – IFPA Materials Engineering Program Avenida Almirante Barroso 1155 Marco PA BelémCEP 66093-020 Brazil Federal Institute of Education Science and Technology of Pará - IFPA Estrada do Icuí Guajará PA AnanindeuaCEP 67125-000 Brazil Military Institute of Engineering – IME Department of Materials Science Praça General Tibúrcio 80 Praia Vermelha Urca RJ Rio de JaneiroCEP 22290-270 Brazil

This work presents an experimental investigation of the mechanical properties of composites reinforced with crocheted fabrics of miriti fibers (Mauritia flexuosa) in a polyester matrix. The fabrics were manufactured under different grammages, with and without alkaline fiber treatment. The composites were produced using two different viscosity conditions of the polyester matrix and part of these underwent post-cure treatment at 60°C. In order to evaluate the effects of the input variables, the samples were produced by manual lamination with curing under vacuum, following a complete factorial experimental matrix type 24, tested according to the ASTM D 3039 standard. The results showed that the variables alkaline treatment of the fibers and viscosity of the matrix presented statistically significant effects on the responses limit of tensile strength and modulus of elasticity. The highest level of tensile strength (13.02 MPa) was obtained in composites with alkaline treatment of the fibers, fabric grammage 473.9 g/cm2, matrix with higher viscosity and post-cure application, while the modulus of elasticity obtained the best performance (1.59 GPa) in samples without alkaline treatment of the fibers, manufactured with the fabric of lower grammage, with a more viscous matrix and that underwent post-curing. © 2023, The Authors. All rights reserved.

关键词： Fibers

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Coupling between bulk thermal defects and surface segregation dynamics

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Physical Review B 2021年第8期104卷 085408-085408页

作者： Jonathan Li Siming Zhang Chaoran Li Yaguang Zhu Jorge Anibal Boscoboinik Xiao Tong Jerzy T. Sadowski Guofeng Wang Guangwen Zhou Department of Mechanical Engineering & Materials Science and Engineering Program State University of New York Binghamton New York 13902 USA Department of Mechanical Engineering and Materials Science University of Pittsburgh Pittsburgh Pennsylvania 15261 USA Center for Functional Nanomaterials Brookhaven National Laboratory Upton New York 11973 USA

Surface segregation is a phenomenon that depends on the delicate interplay between thermodynamic driving forces and kinetic obstacles, for which elevated temperature is often needed to enhance the atom mobility and reach equilibrium. Using the classic system of Cu3Au(100) under nonisothermal conditions, herein, we show an adatom process underlying transient surface segregation dynamics through the temperature-change-driven creation and annihilation of thermal vacancies in the bulk and the resulting bulk-surface mass exchanges. This is demonstrated by monitoring the surface composition evolution of Cu3Au(100) with temperature changes between 250 and 500∘C, showing that the increase in temperature decreases monotonically the surface Au concentration as a result of the transfer of more Cu than Au from the bulk to the surface to form Cu-rich clusters of adatoms. Such a bulk thermal defect effect is expected to be universal in inducing the disparity in the bulk-surface mass exchanges of dissimilar atoms in multicomponent materials because of the inherent differences in the vacancy formation energies of the constituent atoms.

关键词： Self-diffusion Surface & interfacial phenomena Transition metal alloys Density functional calculations Ion beam analysis Mass spectrometry Scanning tunneling microscopy X-ray photoelectron spectroscopy

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Potential of caffeic acid as an effective natural antioxidant for polypropylene-polyethylene copolymers: A DFT and experimental study

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Current Research in Green and Sustainable Chemistry 2024年 9卷

作者： Hernández Fernández, Joaquín Alejandro Ortiz Paternina, Katherine Liset López Martínez, Juan Chemistry Program Department of Natural and Exact Sciences University of Cartagena Chemical Engineering Program School of Engineering Universidad Tecnológica de Bolivar Parque Industrial y Tecnológico Carlos Velez Pombo Department of Natural and Exact Science Universidad de la Costa Polytechnical University of Valencia (UPV) Institute of Materials Technology (ITM)

Caffeic acid (CAF) i is a polyphenolic compound commonly found in plants, valued for its ability to act as an antioxidant. This study focused on investigating the impact of a natural antioxidant, specifically caffeic acid (CAF), compared to two synthetic antioxidants, butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT), on the thermal stability of propylene/ethylene copolymer (C-PP/PE), Aiming to establish a theoretical framework for the advancement of novel polymeric antioxidant compounds. Theoretical calculations were conducted to determine each compound's thermodynamic properties and antioxidant activity. The phenolic hydroxyl bond dissociation enthalpy (BDE) values revealed that BHA had the lowest value (325.6 kJ mol⁻¹), trailed by CAF (328.2 kJ mol⁻¹) and BHT (341.3 kJ mol⁻¹), indicating a higher electron-donating capacity of BHA. Transition energy (TS) calculations indicated that BHA had the lowest TS energy (49.29 kJ mol⁻¹), succeeded by CAF (57.61 kJ mol⁻¹) and then BHT (75.57 kJ mol⁻¹), suggesting greater efficiency in radical scavenging. Additionally, the obtained rate constants showed that CAF had the highest hydrogen abstraction rate (k = 1.05 × 10⁵ M⁻¹ s⁻¹), followed by BHA (k = 1.17 × 10⁴ M⁻¹ s⁻¹), and then BHT (k = 4.2 × 10³ M⁻¹ s⁻¹). These results support the effectiveness of CAF as a potentially more active antioxidant. In the experimental part of this study, it was observed that C-PP/PE with BHA showed a lower melt flow index (MFI) (8.51), indicating more excellent thermal stability. On the other hand, samples containing natural caffeic acid extracts exhibited a gradual decrease in MFI with increasing CAF concentration (MFI of 9.4, 8.82, 7.59, 6.44, and 5.98 for concentrations of 0.025, 0.05, 0.075, 0.1, and 0.125 ppm, respectively), suggesting a progressive improvement in the thermal stability of C-PP/PE

关键词： Activation energy Antioxidant Bond dissociation energy Caffeic acid MFI Stability

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Elastocaloric effect in amorphous polymer networks undergoing mechanotropic phase transitions

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Physical Review materials 2021年第6期5卷 L062401-L062401页

作者： J. A. Koch J. A. Herman T. J. White Department of Chemical and Biological Engineering University of Colorado Boulder Boulder Colorado 80309 USA Materials Science and Engineering Program University of Colorado Boulder Boulder Colorado 80309 USA

Deformations of amorphous polymer networks prepared with significant concentrations of liquid crystalline mesogens have been recently reported to undergo mechanotropic phase transitions. Here, we report that mechanotropic phase transitions are accompanied by an elastocaloric response (ΔT=2.9 K). Applied uniaxial strain to the elastomeric polymer network transitions the organization of the material from a disordered, amorphous state (order parameter Q=0) to the nematic phase (Q=0.47). Both the magnitude of the elastocaloric temperature change and the mechanically induced order parameter are dependent on the concentration of liquid crystal mesogens in the material.

关键词： Elastic deformation Liquid crystal phase transitions Elastomers Liquid crystals

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Macromolecule-Enriched Solvation Enabling High-Voltage Sodium-Ion Batteries

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Angewandte Chemie 2025年

作者： Zhiming Zhao Chen Liu Tianxing Lai Zehao Cui Arumugam Manthiram Materials Science and Engineering Program and Walker Department of Mechanical Engineering The University of Texas at Austin Austin TX 78712 USA

Sodium-ion batteries (SIBs) are emerging as a viable alternative for sustainable and cost-effective energy storage, yet their energy density is curtailed by relatively low voltage outputs (< 4 V) due to the lack of high-voltage electrolytes. Here, for the first time, we describe a high-voltage Na + electrolyte featuring a macromolecule-enriched solvation architecture. The vulnerable small molecules in the Na + solvation shell are replaced by macro polyamide (PA) molecules with high thermodynamic resilience, ensuring a wide electrochemical stability window for the electrolytes with suppressed oxidative/reductive decomposition. Concomitantly, the anions engage in H-bonding with the amido groups of PA, which not only stabilizes the anions against hydrolysis, but also delivers a high Na + transference number of 0.93. Importantly, the nitrogen-rich composition of the macromolecule-enriched electrolyte (MEE) fosters the formation of robust nitride interphases that impart enduring stability to both the cathode and anode. As a result, the hard carbon (HC) || NaNi 1/3 Fe 1/3 Mn 1/3 O 2 (NFM) full cells demonstrate significant rechargeability even with an ultrahigh cutoff voltage of 4.4 V. Our approach distinctively avoids the use of fluorinated molecules typically found in (localized-) high-concentration electrolytes, presenting a novel principle that could revolutionize high-voltage electrolyte design.

关键词： Hard carbon anode High-voltage electrolyte Layered oxide cathode Sodium-ion batteries Solvation structure

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The effects of selectively blocking the electron transport layer of n-i-p perovskite solar cells with polymer particles on device performance

RSC Applied Interfaces

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RSC Applied Interfaces 2024年第3期1卷 591-599页

作者： Altujjar, Amal Wang, Ran Wang, Xuelian Saunders, Jennifer M. Jia, Zhenyu Spencer, Ben Hodson, Nigel Jacobs, Janet Alkhudhari, Osama M. Thomas, Andrew Curry, Richard Saunders, Brian R. Department of Materials University of Manchester MECD Building A Manchester M1 7HL United Kingdom Basic Science Department Deanship of Preparatory Year and Supporting Studies Imam Abdulrahman Bin Faisal University Dammam 34221 Saudi Arabia Photon Science Institute and The Henry Royce Institute University of Manchester Manchester M13 9PL United Kingdom BioAFM Facility Faculty of Biology Medicine and Health University of Manchester Stopford Building Oxford Road Manchester M13 9PT United Kingdom Department of Electrical and Electronic Engineering University of Manchester Manchester M13 9PL United Kingdom

Perovskite solar cells (PSCs) continue to attract considerable academic and industrial interest due to their excellent potential to contribute to solar energy generation. The application of PSCs will benefit from improvements in the understanding of the roles of the interfaces present in charge transport and recombination. The buried perovskite/electron transport layer (ETL) interface in n-i-p PSCs is relatively difficult to study, particularly when molecular additives are used to target that region because they are not able to be visualized by electron microscopy. Here, we use sub-micrometer insulating polystyrene microgel particles (PS MGs) to partially cover the ETL of PSCs. The MGs provide well-defined colloidal additives for selectively covering the ETL because they are laterally constrained and the coverage is readily tuneable. We examine the effect of MG concentration on the device performance and find that the MGs passivate the SnO₂ ETL and obstruct charge transport. We then engineer gaps between the deposited MGs using UV/ozone treatment and achieve a maximum power conversion efficiency (PCE) of 20.09% compared to 19.60% for the control. Remarkably, the PSCs can still function efficiently even when the ETL is mostly covered by the MGs. We show that the most efficient devices have partially covered ETLs with a lateral blocking distance of ∼500 nm. This work demonstrates that mostly covering the ETL with insulating particles does not necessarily lead to a catastrophic decrease in performance. In contrast, this study provides a new scalable method for improving the PCE and for potentially enhancing light management for PSCs in the future. © 2024 RSC.

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