COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2021
·
IF 4.539
Yefeng Feng,Peiyao Chen,Bingshuang Mao,Maolin Bo,Qihuang Deng
Ultrahigh dielectric constant is obtained in polymer/MXene composites due to percolation . However, huge dielectric loss is triggered owing to high leakage current . In this work, hybrid filler consisting of Ti 2 C MXene and ZrO 2 was prepared for coordinating high dielectric constant and low dielectric loss in composites. Instead of Ti 2 C percolation, Ti 2 C/ZrO 2 interface effect mildly increased dielectric constant. Ultrahigh insulation and large aspect ratio of ZrO 2 fibers significantly reduced dielectric loss. Binary polymer/Ti 2 C and ternary polymer/Ti 2 C-ZrO 2 composites were fabricated, and better overall electric traits in ternary system were found. Ti 2 C/ZrO 2 interface effect was studied using density functional theory (DFT) calculations. Ternary composite with 12 wt% filler exhibited high dielectric constant of ~40, low dielectric loss of ~0.09 at 100 Hz and high breakdown strength of ~155 MV m −1 . This work might impulse fabrication of MXene-based hybrid fillers for dielectrics.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Zhanbo Wang,Depeng Gong,Wanyu Chen,Chaocan Zhang
In fields ranging from human motion detection to physiological signal monitoring, medical diagnostics, smart clothing, and human–machine interaction, the demand for flexible strain sensors is continuously growing. This demand has spurred active exploration into high-performance flexible strain sensors. Most strain sensors developed through various technologies are based on elastomers with a single elastic modulus serving as the flexible substrate, which determines the recovery time for different strain behaviors. Although such strain sensors are ubiquitous, it has been shown that a single modulus may affect motion or recovery time, thus lacking a balance in the elastic modulus of the flexible substrate. In this study, we prepared a strain sensor with a gradient change in elastic modulus. The sensor features a three-layer flexible substrate with different modulus and a conductive network based on high aspect ratio electroless silver-plated glass fibers. The strain sensor exhibits excellent response performance, including an outstanding detection range (0–200 %), high sensitivity (Gauge Factor, GF max = 7760), rapid response time (140 ms), and exceptional durability (10,000 cycles). The unique gradient change in elastic modulus allows the strain sensor to have low residual strain. During the stretch-release process, the sensor can return to near its initial state, exhibiting low hysteresis. This strain sensor can monitor human movements in real-time, such as finger bending, joint flexing, walking, and running, making it a promising candidate for applications in human motion monitoring and smart wearables.
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Zhao-Yun Wang,Lei Jin,Jia-Qiang Yang,Yi Zhao,Tao Song,DongPing Zhan,Da-quan Yu,Fang-Zu Yang,Shi-Gang Sun
The uniform thickening of high aspect ratio (AR) through-holes (HAR-TH, AR: 10–12:1) by Cu electronic plating (Cu-EP) is essential in printed circuit boards fabrication, and is often accomplished with organic levelers and at low current densities (6–15 mA/cm 2 ). Nevertheless, the organic levelers are often unstable and the Cu-EP at low current densities presents low production efficiency. In this study, we demonstrate that inorganic compound sodium azide (SAD) can act as a novel leveler in acidic Cu-EP for achieving uniform thickening of HAR-THs (AR: 12:1) even at a high current density of 20 mA/cm 2 . The throwing power using SAD for HAR-THs (AR: 12:1) thickening reaches as high as 94.7 %. Galvanostatic measurements and cyclic voltammetry tests on Pt rotating disk electrode (Pt-RDE) reveal that the competitive adsorption among the three additives of SAD, PEG and SPS occurs only at high rotating rate, referring to a strong inhibition of cupric ions reduction at violent convection area of the HAR-THs mouth. In situ FTIR spectroscopy analyses combined with DFT theoretical calculations illustrate that the synergistic effect of SAD and PEG is manifested by the formation of a PEG-SAD co-adsorption layer. The key to achieving uniform thickening lies in the difference in competitive adsorption abilities between the PEG-SAD co-adsorbed layer and SPS at both mouth and middle part of the HAR-THs. The PEG-SAD co-adsorption layer occupies all active sites of the HAR-THs mouth, preventing SPS from adsorption and thus reducing Cu deposition rate. However, the SPS firmly occupies active sites of middle part of the HAR-THs, facilitating to maintain a consistent Cu deposition rate inside the HAR-THs, consequently achieving uniform Cu thickening of the HAR-THs.
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ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Kai Cai,Weiyun Zhang,Jin Zhang,Huiqiao Li,Heyou Han,Tianyou Zhai
Gold nanoparticles (AuNPs) exhibit great potential for biological applications due to their good biocompatibility and tunable localized surface plasmon resonance (LSPR) properties. Currently, although tuning the aspect ratio of a solid structure or designing a hollow structure has been performed to regulate the LSPR properties of AuNPs, the method of preparing hollow anisotropic AuNPs has rarely been reported. In this study, we designed gold hollow nanorods (AuHNRs) with controllable aspect ratios by a Se-doping Te nanorod-templated method with the assistance of l-cysteine. UV–vis–NIR spectra showed that AuHNRs with an aspect ratio of about 3 could have a LSPR peak in the second near-infrared (NIR-II) window, which is only half of the value required by traditional Au nanorods. Moreover, AuHNRs are nontoxic and capable of loading drugs. In vivo experiment revealed that AuHNRs can be used as contrast agents in multimodal imaging, including photothermal imaging, photoacoustic imaging, and computed tomography imaging, as well as in chemo-photothermal combined therapy of tumor in the NIR-II window. Because light in the NIR-II window has remarkable advantages over that in the first near-infrared (NIR-I) window in biomedical applications, AuHNRs can be used as promising NIR-II-window-responsive multifunctional nanoagents.
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高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2018
·
IF 2.21
Long Mao,Hui-qing Wu,Yue-jun Liu,Jin Yao,Yong-kang Bai
Inspired by versatile adhesive ability of mussel adhesion proteins, tannic acid-Fe(III) functionalized high aspect ratio layered double hydroxides (LDHs@TA-Fe(III)) was firstly prepared via a facile and fast deposition of one-step assembled TA-Fe(III) coatings on the surface of layered clay. LDHs@TA-Fe(III)/poly (ε-caprolactone) (PCL) nanocomposites were prepared by blending LDH@TA-Fe(III) and pure PCL via solution casting method to obtain homogeneous films. The results of thermal analysis confirm that LDHs@TA-Fe(III) can act as a nucleating agent . It is revealed that the inclusion of LDHs@TA-Fe(III) up to an appropriate level of content resulted in a remarkable enhancement in the mechanical and gas barrier properties . However, excess LDHs@TA-Fe(III) loadings give rise to a decrease in the mechanical properties. With incorporation of only 1 wt % LDHs@TA-Fe(III), a 47% increase in elongation at break and 21% reduction in the oxygen relative permeability are achieved. The reinforcement effect brought by LDHs@TA-Fe(III) is fairly noteworthy at low clay loadings potentially owing to the strong interfacial interactions between the clay and matrix.
研究领域:
材料科学
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聚合物纳米复合材料
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功能涂层
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气体阻隔材料
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力学增强
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COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2026
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IF 8.2
Wan Wang,Boda Zhu,Yue Qin,Yue Ren,Qing Meng,Xiao Yang,Yunqing Hao,Chuxin Li,Jiangtao Li,Jinhong Yu,Yong Li
The rapid advancement of high-power-density integrated circuits and electronic devices demands thermally conductive yet electrically insulating composites to effectively mitigate “hot spot” issues. Hexagonal boron nitride nanosheets (BNNS) are promising fillers for dielectric polymer composites to enhance their thermal conductivity. However, constructing high thermal conduction networks and scalably, efficiently synthesizing BNNS remain challenging, which seriously hinders further improvement in the thermal conductivity of BNNS/polymer composites. Herein, we report the preparation of highly thermally conductive and electrically insulating BNNS/cellulose nanofiber (CNF) composite films via vacuum-assisted filtration followed by cold-pressing, in which highly crystalline and ultrahigh-aspect-ratio BNNS were fabricated by a combustion synthesis method. The subsequent cold-pressing step further improved the BNNS orientation and established closer contact between BNNS, forming an interconnected thermal “expressway”. The composite exhibits a high in-plane thermal conductivity of 74.97 W m −1 K −1 . As a heat spreader in high-power LED modules, it demonstrates effective cooling performance (A sharp drop of 28.4 ℃ in LED temperature and a reduction of 5.06 ℃ in the practical computer application). These findings provide an alternative route for producing high-quality BNNS and thermally conductive polymer composites, with promising applications in thermal management for modern electronics.
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NANOTECHNOLOGY
·
2020
·Vol. 32
·期 10
·105710
·
IF 3.551
Lu Zhang,Fuliang Jiang,Bisheng Wu,Chencheng Lv,Minghua Wu
Silver nanowires (AgNWs), appear as an extremely promising candidate for the next generation of flexible transparent conductive electrodes (FTCEs). However, the performance of AgNWs-FTCEs was severely limited by the aspect ratio of AgNWs, while it was still a big challenge to fabricate AgNWs with high aspect ratio nowadays. To improve the aspect ratio of AgNWs, bromide ion (Br−), cupric ion (Cu2+) and polyvinylpyrrolidone (PVP, Mw ≈ 1300 000) which are beneficial for the synthesis of high aspect ratio AgNWs, were introduced in this article. The high quality and uniform AgNWs with the average diameter of 77.6 nm and the aspect ratio above 2000 were fabricated via a one-step solvothermal method. The effects of reaction time, molar ratio of AgNO3 to PVP and the concentration of CuBr2 on the aspect ratio of AgNWs were discussed. The mechanism of the synthesis of high aspect ratio AgNWs was explored. After that, the prepared AgNWs were spin-coated on the surface of PET film, the FTCEs based on the ultra-high aspect ratio AgNWs without any post-treatments exhibits relatively high transmittance, low haze and low sheet resistance, and the AgNWs have little effect on the optical performance of pristine PET film. The outstanding performance of the prepared FTCEs indicated that the ultra-high aspect ratio AgNWs are ideal materials in the application of FTCEs, and the method of fabricating AgNWs could provide a direction to the high aspect ratio AgNWs.
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Nanoscale
·
2024
·Vol. 17
·期 1
·567-574
·
IF 5.8
Jia-Lei Xu,Rui-Dong Shi,Hai-ping Zhou,Guo-Tao Xiang,Zi-Dong Zhou,Yong-Da Hu,Jin-Ju Chen
Silver nanowires (AgNWs) with high aspect ratios are pivotal for the production of flexible transparent conductive films (TCFs). The growth of AgNWs is significantly influenced by the strong affinity of halogen ions for silver ions. This affinity plays a crucial role in the controlled deposition of silver along the nanowire axis. By precisely controlling the concentrations of Cl− and Br− ions, we have successfully synthesized AgNWs with remarkable lengths of 96 μm and diameters of 40 nm, achieving an impressive aspect ratio of 2400. Utilizing density functional theory and molecular dynamics simulations, we investigate the impact of these ions on the growth of AgNWs. Our findings reveal that halogen ions strongly adsorb onto the Ag (100) plane in the radial direction, with Cl− ions promoting anisotropic growth and Br− ions effectively limiting the nanowire diameter, thus achieving high aspect ratio AgNWs. The resulting TCFs exhibit a high transmittance of 95.0% at 550 nm and a low sheet resistance of 14.7 Ω sq−1. Moreover, when integrated into a flexible transparent heater, these TCFs demonstrate a high heating rate of 12.1 °C s−1. The development of AgNWs is poised to significantly enhance the performance and versatility of flexible TCFs.
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MICROCHEMICAL JOURNAL
·
2024
·
IF 4.9
Feng Zhang,Enxi Ren,Zemiao Wang,Ling Fang,Weijuan Yang,Liaoyuan Zhang,Zongwen Wang
On-site visual detection of organophosphorus pesticides (OPs) is crucial for safeguarding environmental and food safety. This study presents a robust, sensitive, and portable paper-based multicolor sensor (PMS) for the on-site detection of OPs. The PMS involves a novel Au + -induced gold nanobipyramids (AuNBPs) morphology transformation reaction within a paper-based analytical device (PAD) coupled with a bienzymatic hydrolysis system. The Au + -induced reaction sensitively regulates the aspect ratio of AuNBPs through Au + disproportionation, which decreases the length of AuNBPs and simultaneously increases the width, accompanied by distinct multicolor changes. Upon performing in the PAD incorporating easily-prepared AuNBPs-deposited nylon membranes, a metal heater, and an oscillator, the Au + -induced reaction exhibits excellent reaction sensitivity, efficiency, reproducibility, AuNBPs stability, and color uniformity. In the bienzymatic hydrolysis system, acetylcholinesterase (AChE) and choline oxidase hydrolyze acetylcholine to product H 2 O 2 , which consumes tris(2-carboxyethyl)phosphine hydrochloride (TCEP), maintaining free Au + for the disproportionation in the Au + -induced system, while the presence of OPs inhibits AChE activity, preserving TCEP to chelate Au + and hindering the disproportionation. Under optimized conditions, the PMS exhibited eight dichlorvos concentration-corresponding color changes with a visual detection limit of 30 μg/L and a spectrometry detection limit of 8.1 μg/L. It achieved recoveries of 85.4–101.9 % in river water, drinking water, rice, and Chinese cabbage samples with relative standard deviations (n = 5) < 6 %. Thus, this study offers a portable, sensitive, reliable, and practical on-site detection method for OPs. Additionally, the proposed Au + -induced AuNBPs morphology transformation system within the PAD offers promising alternative strategies for developing other AuNBPs-based colorimetric sensors.
研究领域:
环境科学
·
分析化学
·
纳米技术
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NANO
·
2026
·
IF 1.3
Zijie Zhang,Xiang Lin,Xinyi Li,Tao Hu,Lulu Liu,Junjie Liu,Ting Xiao,Lihua Jiang,Ruofei Xiang,Xinyu Tan
Superhydrophobic coatings have been considered as promising candidates for anti-icing application in recent years. However, such coatings are easily damaged by mechanical loads due to their fragile micro/nano structures, and they are also prone to transit from the Cassie-Baxter to the Wenzel state during icing process, which greatly limits their lifespan. Herein, a superhydrophobic coating with a water contact angle of 152.5° and water sliding angle of 4° was prepared on aluminum substrate through chemical etching followed by spinning. The coating possesses high-aspect-ratio micro-protrusions and strong interlock with substrate, thereby endowing it with larger energy barrier for water impaling in rough structure, smaller heat losses with freezing droplet, superior protecting effect for nanostructure. Consequently, the coating exhibits enhanced anti-icing and mechanical robustness with a ~7.7-fold prolongation in freezing delay than the bare Al substrate and superior withstanding capacity in a series of tests. It can be expected that the coating has a promising prospect in the practical anti-icing applications owing to its straightforward fabrication, good mechanical robustness and excellent anti-icing property.
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高影响因子
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