Scientific Reports
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2020
·Vol. 10
·期 1
·1-14
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IF 3.998
Zhang Junwei,Chen Yan,Nie Zeguang,Chen Zhengshou,Gao Junkai
In this study, silver microspheres (SMS) were introduced into cotton stalk porous-carbon (CSP) to prepare silver microsphere doping porous-carbon (SMS-CSP), and then SMS-CSP was used as the matrix of polyethylene glycol (PEG) to synthesize shape-stable phase change material of PEG/SMS-CSP. It was found that the introduction of SMS into CSP could not only greatly improve the loading capacity of the porous-carbon for PEG, but also could increase the thermal conductivity of PEG/SMS-CSP. Additionally, the method of introducing SMS into porous-carbon had the advantages of environmental protection and simple operation. Moreover, the raw material of cotton stalk is a kind of agricultural waste, which has the merits of wide source, low price and easy to obtain. Furthermore, in the preparation of cotton stalk porous-carbon, with the increase of pyrolysis temperature the thermal conductivity of PEG/SMS-CSP could be enhanced significantly. The mechanism about the enhancement of thermal conductivity was clarified, which could provide more basic theory for the study about the thermal conductivity of shape-stable phase change materials (ss-PCMs) based on porous-carbon.
研究领域:
材料科学
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能源工程
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DOI
PubMed
高影响因子
Micro & Nano Letters
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2015
·Vol. 10
·期 12
·689-692
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IF 0.853
Jun Zhu,Xiufang Xu,Maomao Yao,Yiqun Zheng,Shifeng Hou
A facile approach to producing silver (Ag) microspheres with a porous structure via a one-pot synthesis is described. The success of this work relies on the use of Cu 2+ to mediate the reduction of silver chloride by oleylamine. The type of additives, amount of copper(II) chloride, type of Ag precursor and reaction temperature were systematically investigated to reveal their roles in the formation of the unique porous structure. The method described provides a convenient route for fabricating porous Ag micro/nanocrystals and could be potentially extended to similar synthesis of other noble metals.
研究领域:
材料科学
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化学
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DOI
高影响因子
MICROCHIMICA ACTA
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2018
·Vol. 185
·期 4
·1-8
·
IF 5.705
Ren Xiaohui,Cheshari Emily C.,Qi Jingyao,Li Xin
An efficient approach is demonstrated for preparing particles consisting of a silver core and a shell of molecularly imprinted polymer (Ag@MIP). The MIP is prepared by using bisphenol A (BPA) as the template and 4-vinylpyridine as the functional monomer. The Ag@MIP fulfills a dual function in that the silver core acts as a SERS substrate, while the MIP allows for selective recognition of BPA. The Ag@MIP is characterized by scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, thermogravimetric analysis and Raman spectroscopy. The Raman intensity of Ag@MIP is higher than that of bare silver microspheres. The detection limit for BPA is as low as 10 −9 mol·L −1 .
Schematic illustration of the preparation of silver microspheres coated with a molecularly imprinted polymer (Ag@MIPs) for detecting bisphenol A (BPA) by surface enhanced Raman scattering (SERS).
研究领域:
分析化学
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环境科学
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材料科学
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高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2020
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IF 3.232
Xiaohui Ren,Xiaoxiang Feng,Ming Jin,Xin Li
Dummy molecular imprinted polymers (MIPs) with carbendazim as a dummy template coated with Ag microspheres were fabricated in N, N-dimethylformamide solution via a surface-enhanced Raman scattering (SERS) enhancement for detection of benzimidazole by using methylacrylamide and ethylene glycol dimethacrylate as the functional monomer and cross-linker, respectively. The scanning electron microscope, transmission electron microscope, energy dispersive spectrometer, particle size distribution analysis, and X-ray diffraction were used to perform the morphology, size, and crystal structure for prepared Ag@dummy MIPs. Under the optimal conditions, the SERS detection method presented good linearity with concentrations in the range of 1.0 × 10 -3 ~ 1.0 × 10 -8 mol L -1 for benzimidazole at 774 cm −1 and 1004 cm −1 , respectively. And the minimum detection concentration of this method was as low as 1.0 × 10 -8 mol L -1 . Besides, Ag@dummy MIPs exhibited satisfactory sensitivity and selectivity to benzimidazole instead of carbendazim due to the dummy imprinting technology to eliminate the background noise interference. The reusability result of Ag@dummy MIPs was shown that the characteristic peaks of benzimidazole are still obvious after four times of repeated detection. This method provided an effective way to develop a qualitative and semi-quantitative analysis of benzimidazole in complex matrices.
研究领域:
分析化学
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材料科学
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PubMed
高影响因子
FOOD CHEMISTRY
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2020
·
IF 6.306
Jie He,Hongxia Li,Lulu Zhang,Xiao Zhi,Xin Li,Xin Wang,Zijian Feng,Guangxia Shen,Xianting Ding
Due to the excessive use of fungicides, pesticide residues have become a growing concern in recent years. Herein, we demonstrated an easy-prepared and low-cost surface enhanced Raman Scattering (SERS) chip composed of 3D silver microspheres (AgMSs) pattern for the quantitative testing of carbendazim in Chinese tea. Compared with the common monolayer SERS substrate, the 3D patterns formed by self-assembly AgMSs with fine nanostructure can offer much more aggregation-induced hotspots and generate strong 3D synergetic effects. Furthermore, when the thickness of the 3D pattern exceeded 6 μm, we replaced the conductive supporting coatings using the glass slides to reduce the cost without any impact on SERS properties. The prepared 3D chips achieved the determination of carbendazim within the linear range of 0.1–10 mg/L and the detection limit of 0.01 mg/L. It is simple and sensitive enough for the detection of most pesticide residues or other harmful organic molecules in our food or environment.
研究领域:
分析化学
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食品安全
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材料科学
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DOI
PubMed
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2022
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IF 5.999
Zeyu Zhao,Jia Yan,Tao Wang,Yanxue Ma,Maobin Xie,Xuan Mu,Xiaoqin Wang,Zhaozhu Zheng,Yuling Li,Gang Li
The present paper describes a novel multi-functional Calotropis gigantea (CG) fabric with durable antibacterial property and comfortable wearability for various applications. First, antibacterial microspheres (AMs) were prepared by self-assembly of silk fibroin (SF), chitosan (CS) and nano-silver microspheres (NSMs). Oxygen low-temperature plasma (OLTP) treatment was used to improve the adhesion between AMs and CG yarn. The AMs modified CG fabric has soft hand feeling, high moisture regain (10.37 ± 1.87%), good breathability, strong wrinkle resistance, and durable antibacterial properties. The antibacterial rate of the modified CG fabric against Escherichia coli ( E. Coil ) and Staphylococcus aureus ( S. Aureus ) is as high as 99.9 ± 0.1%, and it still has an antibacterial activity after washing 20 times (90.24 ± 0.65% and 80.25 ± 1.14%, respectively). The in vivo biocompatibility test showed clear signs of angiogenesis at the implantation site in the rats. Thus, this study offers the foundation for the development of functional CG fiber-based biomedical textiles.
研究领域:
纺织科学
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材料科学
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生物医学工程
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纳米技术
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PubMed
高影响因子
ACS Nano
·
2024
·
IF 15.8
PeiChi Liao,Haichang Guo,Hongyu Niu,Ruijie Li,Ge Yin,Lei Kang,Liuchen Ren,Ruicong Lv,Huifeng Tian,Shizhuo Liu,Zhixin Yao,Zhenjiang Li,Yihan Wang,Lina Yang Zhang,U Sasaki,Wenxi Li,Yijie Luo,Junjie Guo,Zhi Xu,Lifen Wang,Ruqiang Zou,Shulin Bai,Lei Liu
The rapid development of modern electronic devices increasingly requires thermal management materials with controllable electrical properties, ranging from conductive and dielectric to insulating, to meet the needs of diverse applications. However, highly thermally conductive materials usually have a high electrical conductivity. Intrinsically highly thermally conductive, but electrically insulating materials are still limited to a few kinds of materials. To overcome the electrical-thermal conductance trade-off, here, we report a facile Pechini-based method to prepare multiple core (metal)/shell (metal oxide) engineered fillers, such as aluminum-oxide-coated and beryllium-oxide-coated Ag microspheres. In contrast to the previous in situ growth method which mainly focused on small-sized spheres with specific coating materials, our method combined with ultrafast joule heating treatment is more versatile and robust for varied-sized, especially large-sized core–shell fillers. Through size compounding, the as-synthesized core–shell-filled epoxy composites exhibit high isotropic thermal conductivity (∼3.8 W m–1 K–1) while maintaining high electrical resistivity (∼1012 Ω cm) and good flowability, showing better heat dissipation properties than commercial thermally conductive packaging materials. The successful preparation of these core–shell fillers endows thermally conductive composites with controlled electrical properties for emerging electronic package applications, as demonstrated in circuit board and battery thermal management.
研究领域:
材料科学
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电气工程
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热能工程
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复合材料
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DOI
PubMed
高影响因子
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