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An Integrated Sandwich-Structure Polyaniline-Polyvinyl Alcohol Hydrogel with Robust Interface for All-Gel-state Supercapacitor and Strain Sensor

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SSRN 2024年

作者： Li, Wanwan Chen, Zhizhou Zhang, Wenhan Zhao, Xinxin Ren, Chunlei Wei, Peng Zhang, Dianbo Yin, Yunlei Zhai, Wei Dai, Kun Guan, Fangyi College of Intelligent Textile and Fabric Electronics Zhongyuan University of Technology Zhengzhou450007 China The Key Laboratory of Advanced Materials Processing and Mold Ministry of Education College of Materials Science and Engineering Zhengzhou University Zhengzhou450001 China Center for Advanced Materials Research Zhongyuan University of Technology Zhengzhou450007 China Center of Neural Engineering Institute of Integrated Technology Shenzhen Institute of Advanced Technology CAS Shenzhen518071 China Donghua University China

The multifunctional devices, featuring charge storage and multiple responses properties, are undergoing the staggering speed of advancements, thanks to the flourishment of flexible electronics. Typically, the sandwich-structure hydrogel devices, are considered as ideal candidates for both flexible supercapacitors (SCs) and sensors for wearable powering and sensing electronics. However, the interfacial issues, including weak interfacial adhesion, high interface resistance and relative slippage phenomena, plague their development and practical applications. Herein, we construct a sandwich-structure hydrogel with robust interfaces via in-situ depositing precursor solution of polyaniline-polyvinyl alcohol hydrogel on both sides of a polyvinyl alcohol-borax hydrogel, capable of being employed as a SC and strain sensor, simultaneously. The robust fused interfaces are ascribed to the identical polyvinyl alcohol constituent presented in each layer and multi-interactions involving in the reversible dynamic borate ester bonds and hydrogen bonds. With such interface adhesion and mechanical toughness, the integrated hydrogel can be folded and twisted and manifests a tensile strength of 9.20 MPa and a breaking elongation of 367%. As an all-gel-state SC, the device exhibits superior areal capacitance of 1604 mF cm-2, outstanding energy density of 142.6 μWh cm-2, splendid capacitance retention of 95% after 1000 GCD cycles, as well as bending deformations tolerance and structural stability. Moreover, the hydrogel-based strain sensor can detect various subtle and large movements of human body, such as facial expression, swallowing, phonation, and joints movements in real-time. This work not only proposes an effective strategy of constructing robust interfaces for the layered-structure electronics, but also provides a practical guidance for the large-scale production of multifunctional wearable electronics. © 2024, The Authors. All rights reserved.

关键词： Hydrogen bonds

Controllable preparation and microwave absorption properties of shape anisotropic Fe_(3)O_(4) nanobelts

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Journal of Materiomics 2021年第5期7卷 957-966页

作者： Jialiang Pan Rujing Zhang Jun Ling Min Wang Zechen Li Zhen Zhen Limin He Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing100084China The First Scientific Research Institute of Wuxi Wuxi214035JiangsuChina Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Material AECC Beijing Institute of Aeronautical MaterialsBeijing100095China

To substantially prevent electromagnetic threatens,microwave absorbing materials(MAMs)are required to eliminate surplus electromagnetic *** a typical MAM,Fe_(3)O_(4) particles with complex permittivity and permeability have been widely applied due to the coexistence of magnetic loss and dielectric ***,the necessary high mass fraction significantly limited its applications,thus Fe_(3)O_(4) nanostructures have been extensively investigated to overcome this *** this work,uniform Fe_(3)O_(4) nanobelts were prepared by electrospinning and two-step thermal *** controlling the composition and viscosity of the electrospinning precursor solution,Fe_(3)O_(4) nanobelts with tunable lateral sizes(200 nme1 mm)were *** samples with low content(only 16.7 wt%)Fe_(3)O_(4) exhibited wide maximum effective absorbing bandwidths(EAB)over 3 GHz,and Fe_(3)O_(4) nanobelts with smaller lateral sizes showed a maximum EAB of 4.93 ***,Fe_(3)O_(4) nanobelts with smaller lateral sizes presented superior reflection loss properties,the lowest reflection loss reached-53.93 dB at 10.10 GHz,while the maximum EAB was up to 2.98 *** excellent microwave reflection loss of Fe_(3)O_(4) nanobelts was contributed to the enhanced synergistic effect of magnetic loss,dielectric loss,and impedance matching,originated from the hierarchically cross-linked networks and shape *** study could broaden the practical applications of magnetic absorbers,and provided an approach for the development of shape anisotropic magnetic materials.

关键词： Fe_(3)O_(4) Nanobelts Shape anisotropy Microwave absorption Reflection loss

Dimensionality-driven in-plane antiferromagnetism in two-dimensional SrRuO3

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Physical Review B 2023年第6期107卷 064418-064418页

作者： Mo Zhu Zhangzhang Cui Yingying Zhang Zheling Shan Weiwei Li Qingyou Lu Zhengcao Li Yalin Lu Hefei National Research Center for Physical Sciences at the Microscale and Department of Materials Science and Engineering University of Science and Technology of China Hefei Anhui 230026 China Anhui Laboratory of Advanced Photon Science and Technology University of Science and Technology of China Hefei Anhui 230026 China State Key Laboratory for New Ceramics and Fine Processing Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and Engineering Tsinghua University Beijing 100084 China Anhui Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory and Hefei Science Center Chinese Academy of Sciences Hefei 230031 China

Control of dimensionality is a powerful tool to unlock hidden electronic and magnetic phases. In particular, reduced dimensionality in strongly correlated oxides leads to an intriguing “dead-layer” behavior that a transition from (ferromagnetic) metal to (antiferromagnetic) insulator occurs as the thickness approaches the two-dimensional limit. However, the origin of such transition has been a subject of debate that both the intrinsic dimensionality effect and the extrinsic disorder effect are proposed to be the driving force. Here, we reveal a transition from ferromagnetic metal with perpendicular magnetic anisotropy to antiferromagnetic insulator with in-plane magnetic anisotropy in SrRuO3 epitaxial films down to the monolayer limit. Experimentally, we demonstrate that SrRuO3 films below 3 unit cells become magnetic insulators and the spin easy axis changes to the in-plane ⟨110⟩ directions. First-principles calculations reveal that the interplay of the orbital-selective quantum confinement on Ru 4d orbitals and the oxygen octahedral rotation drives the ultrathin films from ferromagnetic metal to antiferromagnetic insulator, reorienting Ru spins from the perpendicular to the ⟨110⟩ directions. Our findings demonstrate how reduced dimensionality can tailor the magnetic state and provide significant advances in one of the debated topics in complex oxide heterostructures that dimensionality effect alone can be the driving force of dead-layer phenomenon in two-dimensional systems.

关键词： First-principles calculations Magnetic anisotropy Magnetic order Metal-insulator transition van Hove singularity Complex oxides Heterostructures Thin films

Effects of Nb and Zr Alloying on the Microstructure, Mechanical Properties Andcorrosion Resistance of Cocrfeni High Entropy Alloys

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SSRN 2023年

作者： Liu, Junxiao Wen, Zhiqin Wang, Mingze Wu, Zhenyu Ma, Bo Chen, Yu Zhao, Yuhong Key Laboratory of New Processing Technology for Nonferrous Metals & Materials Ministry of Education School of Materials Science and Engineering Guilin University of Technology Guilin541004 China Beijing Advanced Innovation Center for Materials Genome Engineering China

It is a hot topic to improve the properties of CoCrFeNi matrix by adding elements with large atomic radius in recent years. In this work, a series of CoCrFeNiZrxNb(0.4-x) (x = 0, 0.1, 0.2, 0.3, 0.4) high entropy alloys (HEAs) were prepared using vacuum arc-melting, and the synergistic effect of Zr and Nb alloying on microstructure, mechanical properties and corrosion resistance of the HEAs were studied. All the alloys are consisted of face-centered cubic (FCC) phase and Laves phase via synergistic alloying with Zr and Nb, and a new kind of Zr(Nb)-rich Laves phase precipitate in CoCrFeNiZr0.2Nb0.2. The two segregate intermetallic phase and FCC matrix are intertwined to form a typical hypoeutectic structure. Moreover, the synergistic effect of solid solution strengthening, precipitation strengthening and fine grain strengthening of CoCrFeNiZr0.2Nb0.2 HEAs leads to high yield strength and ultimate strength of 810 MPa and 1595 MPa, maintaining a good compressive strain of 21.15%. Furthermore, the corrosion resistance of the considered HEAs first increases and then decreases with the content of Zr continuous increasing, which is related to the preferential occurrence of pitting corrosion in Zr(Nb)-rich Laves phase region. The passivation film of CoCrFeNiZr0.2Nb0.2 surface is more stable since the more uniform elemental distribution and finer grain size, so the corrosion resistance of CoCrFeNiZr0.2Nb0.2 is better than other considered alloys. © 2023, The Authors. All rights reserved.

关键词： Corrosion resistance

Sub-Nano Gaδ+ clusters confined by porous carbon spheres and coupled with SnS2 for efficient photocatalytic extraction of uranium

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Separation and Purification technology 2025年 363卷

作者： Pan, Yuehua Pang, Yingxue Fu, Hao Cai, Zhenyu Deng, Yuxiang Huang, Zhiwei Ren, Donglou Wei, Yuezhou Wang, Xinpeng State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials School of Resources Environment and Materials Guangxi University Nanning530004 China Laboratory of Nuclear Energy Chemistry Institute of High Energy Physics Chinese Academy of Sciences Beijing100049 China School of Nuclear Science and Technology University of South China Hengyang421001 China

Extracting uranium from uranium waste streams, particularly utilizing zero-carbon emission photochemistry, emerges as a promising and sustainable strategy. Herein, we construct an SS@Ga/PCS composite photocatalyst, consisting of SnS2 nanosheets as well as a metal − support produced by confining sub-nano Gaδ+ clusters in the hollow porous carbon spheres (PCS). The Gaδ+ clusters are innovatively introduced as active sites with localized hole capability to simultaneously improve visible light response and carrier separation. In-situ characterizations and theoretical calculations reveal that Gaδ+ clusters induced metal-support interaction (MSI) by optimizing the electronic structure in the PCS host;In addition, Gaδ+ clusters act as plasma excitation elements to enhance the visible light responsiveness and carrier separation of SS@Ga/PCS. Ultimately, the inhomogeneous photocatalysis of uranium extraction achieved superior performance as compared to the pure components, corresponding to an encouraging removal rate of 97.87 % and a photo-extraction capacity of up to 1867.30 mg g−1 in 50 mL of uranium waste solution, as well as a wide-concentration window adaptability and excellent catalytic robustness. More significantly, this ingenious nano-confined strategy extends the design ideas of highly dispersed sub-nanometallic cluster co-catalysts and stimulates the study of the availability of abundant reactive active sites combined with monomer strong interactions, which provides a novel insight into the mechanism of photocatalytic uranium extraction. © 2025

关键词： Carbon

Precise Synthesis of Hollow Mesoporous Palladium–Sulfur Alloy Nanoparticles for Selective Catalytic Hydrogenation

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CCS Chemistry 2022年第8期4卷 2854-2863页

作者： Hao Lv Lizhi Sun Dongdong Xu Wei Li Bolong Huang Ben Liu Key Laboratory of Green Chemistry and Technology of Ministry of Education College of ChemistrySichuan UniversityChengdu 610064 Jiangsu Key Laboratory of New Power Batteries Jiangsu Collaborative Innovation Center of Biomedical Functional MaterialsSchool of Chemistry and Materials ScienceNanjing Normal UniversityNanjing 210023 Department of Chemistry Laboratory of Advanced MaterialsShanghai Key Laboratory of Molecular Catalysis and Innovative MaterialsiChEM and State Key Laboratory of Molecular Engineering of PolymersFudan UniversityShanghai 200433 Department of Applied Biology and Chemical Technology The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong SAR 999077

Hollow mesoporous metals have unique potential for catalysis,but their precise synthesis and further elaboration of their structure–performance relationships are still huge ***,wereport a new synthetic strategy,named the Kirkendall effect in synergistic template(KEST),for the desired preparation of hollow mesoporous palladium–sulfur(h-mesoPdS)alloy nanoparticles.

关键词： mesoporous material hollow cavity palladium hydrogenation selective catalysis

Multi-objective optimization and its application in materials science

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materials Genome Engineering Advances 2023年第2期1卷 60-76页

作者： Bofeng Shi Turab Lookman Dezhen Xue State Key Laboratory for Mechanical Behavior of Materials Xi'an Jiaotong UniversityXi'anChina AiMaterials Research LLC Santa FeNew MexicoUSA Beijing Advanced Innovation Center for Materials Genome Engineering Institute for Advanced Materials and TechnologyUniversity of Science and Technology BeijingBeijingChina

Optimizing more than one property is inevitable in designing new materials;however,some properties are usually improved at the expense of *** optimization methods in engineering and computer science have proven to be an effective means to optimize several different properties ***,we reviewed these approaches including scalarization,evolutionary algorithms,and especially Bayesian *** promising applications to a number of materials problems are also discussed in the paper.

关键词： Bayesian optimization evolutionary algorithms materials design multi-objective optimization Pareto methods

Ferrite Doped Sucrose-Derived Porous Carbon Composites Inspired by Pharaoh's Serpent for Broadband Electromagnetic Wave Absorption

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SSRN 2024年

作者： Yang, Heng Jiang, Xin Sun, Jiuxiao Zhang, Bin Su, Xiaogang Wu, Qilei Qu, Zhengyao Hubei Key Laboratory for New Textile Materials and Applications School of Materials Science and Engineering Wuhan Textile University Wuhan430200 China School of Materials Science and Engineering Wuhan University of Technology Wuhan430070 China School of Materials Science and Engineering North University of China Taiyuan030051 China Science and Technology on Electromagnetic Compatibility Laboratory China Ship Development and Design Centre Wuhan430064 China State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology 430070 China

This paper presents a straightforward and intriguing approach for designing wide bandwidth, lightweight, and tunable electromagnetic wave absorbing materials. Drawing inspiration from the "Pharaoh's Snake", we employed a biomass carbon source, sucrose, to fabricate Fe/Fe3O4@porous carbon (PC) composite materials through combustion experiments. Subsequently, high-temperature calcination was applied to enhance the absorbing properties of the materials. The as-prepared composites demonstrate an impressive 6.62 GHz effective bandwidth and an excellent absorption ability of -51.54 dB at a matched thickness of 2.2 mm. Moreover, by tuning the content of magnetic particles and controlling the thickness of the composite material, comprehensive coverage across C, X, and Ku bands can be achieved. The outstanding absorption performance suggests that the synthesized Fe/Fe3O4@PC porous materials hold significant potential for applications in electromagnetic wave absorption, and opens up a novel, straightforward, and cost-effective approach to acquiring broadband absorbing materials. © 2024, The Authors. All rights reserved.

关键词： Cost effectiveness

From Asymmetry to Symmetry: Biomimetic Multi-Channel Structures for Enhanced Desalination Using Co-Dissolving Porogens

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SSRN 2023年

作者： Qin, Qinxiang Feng, Xiaoping Hu, Dongying State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures MOE Key Laboratory of New Processing Technology for Nonferrous Metals and Materials School of Resources Environment and Materials Guangxi University Nanning530004 China

The asymmetric structures constructed via traditional methods fundamentally determine the "trade-off" bottleneck of cellulose triacetate reverse osmosis (RO) membrane in desalination. So, based on the structure-determined performance, inspired by the pore mechanism of frozen tofu through "water-ice-water" phase transition, the biomimetic RO membrane with high symmetry and homogeneity was successfully utilized in desalination. The co-solubilized N-methyl-2-pyrrolidone (NMP) narrowed the structural differentiation between Top and Bottom, increasing the number of through-water channels, surface hydrophilicity, and flatness of RO membrane. Typically, the prepared membrane with 0.125% NMP concentration has a salt rejection rate of 98.9% for NaCl, and excellent retention rate for other inorganic salts (MgCl2, LiCl). Notably, the NMP-modified membrane has a water flux of up to 17.2 L m-2 h-1, which is nearly 660% higher than that of No porogen-RO membrane (2.6 L m-2 h-1). Further, the membrane retained its separation capacity even after continued operation for 700 min, owing to the enhanced compression of the ductile pores by NMP. Overall, this novel cellulose-based RO membrane represents a structural mechanism for the design of innovative biomimetic multi-channel structures for long-term and efficient desalination. © 2023, The Authors. All rights reserved.

关键词： Desalination