RSC Advances
·
2021
·Vol. 11
·期 36
·22343-22351
·
IF 3.361
Haibao Zhang,Xian Zhang,Kang Zheng,Xingyou Tian
Surface modification of hexagonal boron nitride (h-BN) has the problem of reducing the interfacial thermal resistance, which has hindered its application in thermal conductive composites. Herein, poly glycidyl methacrylate (PGMA) chains were grafted onto the h-BN surface by simple radical polymerization; the thermal conductivity of epoxy (EP) composites was improved by adding the as-grafted h-BN–PGMA to EP resin. When the filling volume of h-BN–PGMA was 4, 10 or 16 vol%, the thermal conductivity of EP composite increased by 160%, 298% or 599%, respectively. Moreover, the h-BN surface modification was beneficial to enhance the compatibility between the filler and the EP matrix. Compared to EP/h-BN, the EP/h-BN–PGMA had higher thermal conductivity (1.197 W m−1 K−1) under the same filling amount (16 vol%). Moreover, excellent dielectric properties and thermal stability indicated that EP/h-BN–PGMA composites were excellent thermal interface materials (TIMs) and could be applied in the field of thermal management. The preparation process is environmentally friendly, easy to operate, and suitable for large-scale practical applications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2014
·
IF 0.872
Jingyun Wang,Fangling Ji,Jishuang Xing,Shuang Cui,Yongming Bao,Wenbo Hao
A block copolymer of 2-dimethylaminoethyl methacrylate (DMAEMA) and glycidyl methacrylate (GMA) was grafted onto the surface of magnetic nanoparticles (Fe 3 O 4 ) via atom transfer radical polymerization . The resultant PGMA-b-PDMAEMA-grafted-Fe 3 O 4 magnetic nanoparticles with amino and epoxy groups were characterized by Fourier transform infrared spectroscopy, powder X-ray diffraction, thermo-gravimetric analysis, and scanning electron microscopy. Lipase from Burkholderia cepacia was successfully immobilized onto the magnetic nanoparticles by physical adsorption and covalent bonding. The immobilization capacity of the magnetic particles is 0.5 mg lipase per mg support, with an activity recovery of up to 43.1% under the optimum immobilization condition. Biochemical characterization shows that the immobilized lipase exhibits improved thermal stability, good tolerance to organic solvents with high lg P , and higher pH stability than the free lipase at pH 9.0. After six consecutive cycles, the residual activity of the immobilized lipase is still over 55% of its initial activity.
研究领域:
生物化学
·
材料科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2023
·
IF 5.1
Yaoxing Xiang,Weijun Zhen,Tianping Zhang,Ling Zhao
In this work, poly(glycidyl methacrylate) (PGMA) were grafted onto the surface of saponite to form polymer brushes (m@g-Sap) via surface-initiated atom transfer radical polymerization (SI-ATRP). Moreover, PLA/m@g-Sap nanocomposites foams were prepared by supercritical carbon dioxide foaming with m@g-Sap as fillers. And its comprehensive performance, structure-properties relationship were investigated. It was shown that m@g-Sap as an efficient nucleating agent enhanced the rheological properties, crystallization behavior and foamability of PLA . The pore density of PLA4 (PLA/m@g-Sap (0.7 wt%) nanocomposites foams) is increased by 3 orders of magnitude and its average pore size is reduced by 84.94%. Furthermore, the unique intercalation structure and branched interpenetration network structure of m@g-Sap effectively improved the compression resistance of PLA based nanocomposites foams. Compared with pure PLA foam, the compressive strength of PLA4 platform region increased by 282%. Finally, what's more, the results of simultaneous rheological and in situ IR, molecular dynamics simulations indicate that there was a significant interaction between m@g-Sap and PLA and CO 2 , which in turn enhanced the melt strength of PLA based nanocomposites and induced the rapid crystallization of PLA. The above results demonstrated that m@g-Sap had great potential to improve the foaming behavior of PLA.
研究领域:
材料科学
·
高分子化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Bio Materials
·
2024
·
IF 4.6
Jihao Zuo,Ruopeng Lan,Ningning Lv,Yitong Lin,Li Hao,Xinhua Zhou,Hongjun Zhou
Pathogens and pests pose significant threats to global crop productivity and plant immunity, necessitating urgent measures from researchers to prevent pathogen contamination and pest damage to crops. A natural plant-based antibacterial agent, eugenol (EUG), has demonstrated excellent antimicrobial and insect repellent capabilities, but the characteristics of volatilization and poor dissolution limit the practical application. The nanoization of pesticide formulations holds promise in the development of highly effective pesticides for antibacterial and insecticidal purposes. Herein, a eugenol-loaded nano delivery system (EUG@CMC-PGMA-CS) was synthesized using glycidyl methacrylate (GMA) as a functional monomer to connect carrier core structure carboxymethyl cellulose (CMC) with shell structure chitosan (CS), and EUG was encapsulated within the carrier. EUG@CMC-PGMA-CS demonstrated excellent leaf affinity, with minimum contact angles (CAs) of 37.83 and 70.52° on hydrophilic and hydrophobic vegetable leaf surfaces, respectively. Moreover, the maximum liquid holding capacity (LHC) of EUG@CMC-PGMA-CS on both hydrophilic and hydrophobic vegetable leaf surfaces demonstrates a noteworthy 55.24% enhancement compared to the LHC of pure EUG. The in vitro release curve of EUG@CMC-PGMA-CS exhibited an initial burst followed by stable sustained release. It is with satisfaction that the nano delivery system demonstrated exceptional antibacterial properties against S. aureus and satisfactory insecticidal efficacy against Spodoptera litura. The development of this eugenol-loaded nano delivery system holds significant potential for enhanced antibacterial and insect repellents in agriculture, paving the way for the application of volatile bioactive substances.
研究领域:
农业科学
·
纳米技术
·
植物病理学
·
害虫管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL PAPERS
·
2023
·
IF 2.2
Li Junqian,Xiong Ao,Mao Bingshuang
Inorganic quantum dots (QDs) are used in color displays because of wide photo-absorption and controllable photoluminescence (PL) colors, but their PL stability may be low due to surface defects. To overcome it, we prepared CdTe QDs with different sizes (~ 3.8, 4.4 and 5.0 nm) and poly(glycidyl methacrylate) (PGMA)/CdTe composite films. An increased size of QDs made them emit the green, yellow and red light successively. With an increased PL emission wavelength, the films emitted bright light with various colors. Compared to QDs solutions, the composite films have the almost unchanged fluorescence emission wavelengths (536–612 nm) and high PL intensity. The latter has an improved PL stability under optical and thermal conditions. The green-emitting film maintains ~ 81% of PL intensity after 24 h of photo-irradiation as well as ~ 91% of PL intensity at 120 °C. The green and white light-emitting diode (LED) devices were prepared using composite films, and the fluorescent emissions with bright colors were acquired. This study provides a valuable guideline for preparing the polymer/inorganic quantum dot composite films used in the LED poster display screens with bright stable fluorescence emissions.
研究领域:
材料科学
·
光电技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Yating Zhou,Xianzhu You,Wenying Liu,Wei Yang,Xuru Jin,Xiaopeng Pei,Sheng Xiang,Hua Zhou,Zhiyong Liao,Ying Tan
Structural colors generated via total internal reflection (TIR) using nanostructure-free micro-concave shapes have garnered increasing attention. However, the application of large micro-concave structures for structural coloration remains limited. Herein, a flexibly tunable structural color film fabricated by casting polydimethylsiloxane (PDMS) on an array of large poly(glycidyl methacrylate) (PGMA) bowl-shaped particles is reported. The resultant film exhibits tunable red to green structural colors with changing observation angles. Moreover, the color can be further tailored by altering the shape of the film itself. The incorporation of the PDMS layer not only facilitates a shift in the locus of TIR from the bottom surface to the top concave surface of the particles, thereby enabling the generation of structural color, but also confers enhanced flexibility to the film. Further decoration with silver nanoparticles imparts antimicrobial properties, yielding a novel antimicrobial coating material with structural colors. The simple and cost-effective strategy for the production of structural color films provides potential applications in antimicrobial coatings, enabling accessible and customizable structural coloration using big-size micro-concave particles.
研究领域:
材料科学
·
光学
·
纳米技术
·
涂层与薄膜
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Biomaterials Advances
·
2022
·
IF 0
Haili Zhao,Tao Chen,Tong Wu,Linsheng Xie,Yulu Ma,Jin Sha
Functional surfaces that enable both spatial and temporal control of biomolecules immobilization have attracted enormous attention for various fields including smart biointerface materials, high-throughput bioarrays, and fundamental research in the biosciences. Here, a flexible and promising method was presented for regulating the spatiotemporal arrangement of multiple biomolecules by constructing the topographically and chemically diverse polymer brushes patterned surfaces. A series of polymer brushes patterned surfaces, including antifouling brushes patterned surface, epoxy-presenting brushes patterned surface without and with antifouling background layer, were fabricated to control the spatial distribution of protein and cell adhesion through specific and nonspecific means. The fluorescence measurements demonstrated the effectiveness of spatially regulating the density of surface-immobilized protein through controlling the areal thickness of the poly (glycidyl methacrylate) (PGMA) brush patterns, leading to various complex patterns featuring well-defined biomolecule concentration gradients. Furthermore, a multiplexed surface bearing epoxy groups and azido groups with various areal densities was fabricated for regulating the spatiotemporal arrangement of different proteins, enabling binary biomolecules patterns with higher degrees of functionality and complexity. The presented strategy for the spatiotemporal control of biomolecules immobilization would boost the development of dynamic and multifunctional biosystems.
研究领域:
智能生物界面材料
·
高通量生物芯片
·
生物科学
✓ 已验证
DOI
PubMed
REACTIVE & FUNCTIONAL POLYMERS
·
2021
·
IF 3.975
Lin Chen,Lin Li,Xu Zhao,Shuangshuang Wang,Yuchao Li,Guang Li,Xiangcai Ge,Liping Wang
In this work, fluorine containing polymer brushes was grafted on the functionalized stainless steel (SS) by activators regenerated by electron transfer atom transfer radical polymerization (ARGET-ATRP) and thiol-epoxy click reaction. PGMA brushes would be grafted on SS by coating the sheets with brominated polydopamine (PDA) as a reactive under-layer, and subsequently surface-initiate ARGET-ATRP of glycidyl methacrylate (GMA). Then the short-fluorinated alkyl chains were anchored on the PGMA backbones based on the click reaction between epoxy groups of PGMA and 1H, 1H, 2H, 2H-perfluorodecanethiol (PFDT), which endowed the surfaces of the polymers with low surface free energy. The surface compositions and morphologies of the functionalized SS have been characterized by attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM) and atomic force microscopy (AFM). The results of water contact angle analysis exhibited high hydrophobicity of the fluorinated polymer grafting modified SS surface. Bovine serum albumin (BSA) resistance performance of the functionalized SS was evaluated by BCA protein assay reagent, fluorescence microscope and XPS. The results exhibited that grafting fluoropolymer brushes modified SS with lower protein adsorption compared with the pristine SS surface, which might be served as promising environmentally friendly polymer antifouling coatings.
研究领域:
材料科学
·
表面化学
·
高分子科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）