MATERIALS & DESIGN
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2018
·
IF 4.525
Mei Chen,Xiao Liang,Wei Hu,Lanying Zhang,Cuihong Zhang,Huai Yang
In this paper, we promote a new polymer microsphere-filled cholesteric-liquid crystal (PFLC) system sandwiched between two flexible substrates for making a robust composite film with both bistable optical performance and high mechanical strength . The effects of the size of the polymer microspheres (PMs) and the pitch of the cholesteric liquid crystals (ChLCs) on the electro-optical performance of the as-made PFLC films were systematically investigated. Results show that the optical appearance of the optimized PFLC film can be reversibly changed between transparent and light-scattering states according to electric field by switching the ChLCs between planar (P) and focal conic (FC) states. Moreover, both P and FC states are stable for more than one year after removing the electric field, which is due to the great reduced polymer specific surface area of 1.78 m 2 /g and the spatial hindrance from the in situ thermally polymerized PMs, respectively. Aside from the long-term optical stability, the high content of the densely packed PMs also endows the PFLC film with a satisfactory shearing strength of 206.0 kPa between the top and bottom substrates, showing great potential applications in a wide range of uses, such as smart windows , electronic paper or writing tablets.
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2019
·
IF 6.669
Pan Jiang,Qiang Li,Ce Gao,Jie Lu,Yi Cheng,Shangru Zhai,Qingda An,Haisong Wang
Here we report a centrifugation-based fractionation methodology that was integrated with three types of organic solvents to fractionate industrial alkali lignin toward the fabrication of lignin microsphere. The Fourier-transform infrared spectroscopy (FT-IR) result showed that the chemical structure of lignin was not changed by solvent fractionation. Soluble lignin in each solvent had lower molecular weight, improved polydispersity index (PDI) and less impurities (S, N), while insoluble lignin had a high bio-char yield and can be utilized as potential carbon source for porous carbon nanosphere materials. In addition, well-shaped lignin microsphere with smooth or anisotropic surface can be prepared by selecting proper lignin fraction without any chemical modification. This work thus provides a new strategy for the derivation of lignin as raw materials for value-added products, which paved a new way to develop a green and sustainable bio-refining industry.
研究领域:
生物化学
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材料科学
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可持续发展
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DOI
PubMed
高影响因子
POLYMER INTERNATIONAL
·
2020
·Vol. 69
·期 5
·485-491
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IF 2.574
Guorong Qiu,Wenshi Ma,Li Wu
Polyimide microspheres were prepared via non-aqueous emulsion polymerization by using pyromellitic dianhydride (PMDA) as anhydride monomer and 2,2-bis(4-(4-aminophenoxy)phenyl)propane as amine monomer. The polyimide microspheres were well characterized by Fourier transform infrared spectroscopy, SEM and laser particle size analyzer. They were spherical in shape and monodisperse and their size was 31–33 μm. Polyimide mixtures formed by polyimide microspheres as fillers and polyimide composed of pyromellitic and dianhydride 4,4′-oxydianiline (ODA) as matrix were investigated with regard to thermal properties, dielectric properties and mechanical properties. With 10%–50% polyimide microspheres in the polyimide mixtures, the dielectric constants were 2.26–2.48 (1 MHz) and the loss tangents were 0.00663–0.00857 (1 MHz), which were both significantly lower than the values for ODA-PMDA polyimide. The decomposition temperature and glass transition temperature were above 440 and 290 °C. The polyimide mixtures possessed excellent thermal resistance. When the percentage of polyimide microsphere addition was 30%, the polyimide mixtures had the largest tensile strength (128.50 MPa) and elongation at break (9.01%). These results indicate that the polyimide microspheres were used as both low dielectric fillers and reinforcing fillers. © 2020 Society of Chemical Industry
研究领域:
材料科学
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化学工程
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DOI
高影响因子
WEAR
·
2021
·
IF 3.892
Chaobao Wang,Xiuqin Bai,Zhiwei Guo,Conglin Dong,Chengqing Yuan
The insufficient lubrication caused by the low viscosity of water has greatly limited the application of water-lubricated bearing, especially under the conditions of heavy load and low speed. In order to solve this problem, a composited strategy is proposed by using the hydration lubrication of polyacrylamide (PAAm) hydrogel to improve the tribological performances of UHMWPE . The PAAm hydrogel microspheres were synthesized by emulsion polymerization , and the PAAm hydrogel microsphere/UHMWPE composites were prepared by melt blending method. The effects of particle size, crosslinking density and filling content of PAAm microspheres on the tribological performances of the composites were tested and analyzed. The results show that the PAAm fragments can form a hydration lubrication layer and improve the tribological performances of the composite. The design of PAAm microsphere/UHMWPE composite provides a novel method to develop high-performance materials for water-lubricated stern tube bearing.
研究领域:
材料科学
·
摩擦学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·
IF 1.289
Yu Yi,Canlin Lai,Yuqi Jiang,Jianfeng Mei,Hong Wang,Guoqing Ying
In this article, we present a novel amino-reserved magnetic chitosan microsphere (ARMCM) prepared from chitosan and Fe 3 O 4 through inverse suspension crosslinking by formaldehyde and epichlorohydrin. The density of ARMCM was 1.47 g/mL, and the amino content was 2.44 mmol/g. The measurements data indicated that the saturation magnetization (σ s ) of ARMCM was 23.2 emu/g. The adsorption results showed that these magnetic chitosan microspheres had good adsorption capacity on endotoxin: the maximum absorption capacity was about 1792.1EU/g in 40 min; the endotoxin adsorption efficiency in the protein solution was close to 80% and what is more, protein adsorption efficiency was only 23.2 and 2.0%, respectively, for acidic and basic proteins. It is expected that this ARMCM will have a feasible and useful application in adsorbing endotoxin from biological products. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
研究领域:
材料科学
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生物技术
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化学工程
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产品关联
DOI
高影响因子
Nature Protocols
·
2013
·Vol. 8
·期 3
·461-480
·
IF 7.96
Zhou Houjiang,Ye Mingliang,Dong Jing,Corradini Eleonora,Cristobal Alba,Heck Albert J R,Zou Hanfa,Mohammed Shabaz
Mass spectrometry (MS)-based proteomics has become the preferred tool for the analysis of protein phosphorylation. To be successful at such an endeavor, there is a requirement for an efficient enrichment of phosphopeptides. This is necessary because of the substoichiometric nature of phosphorylation at a given site and the complexity of the cell. Recently, new alternative materials have emerged that allow excellent and robust enrichment of phosphopeptides. These monodisperse microsphere–based immobilized metal ion affinity chromatography (IMAC) resins incorporate a flexible linker terminated with phosphonate groups that chelate either zirconium or titanium ions. The chelated zirconium or titanium ions bind specifically to phosphopeptides, with an affinity that is similar to that of other widely used metal oxide affinity chromatography materials (typically TiO 2 ). Here we present a detailed protocol for the preparation of monodisperse microsphere–based Ti 4+ -IMAC adsorbents and the subsequent enrichment process. Furthermore, we discuss general pitfalls and crucial steps in the preparation of phosphoproteomics samples before enrichment and, just as importantly, in the subsequent mass spectrometric analysis. Key points such as lysis, preparation of the chromatographic system for analysis and the most appropriate methods for sequencing phosphopeptides are discussed. Bioinformatics analysis specifically relating to site localization is also addressed. Finally, we demonstrate how the protocols provided are appropriate for both single-protein analysis and the screening of entire phosphoproteomes. It takes ∼ 2 weeks to complete the protocol: 1 week to prepare the Ti 4+ -IMAC material, 2 d for sample preparation, 3 d for MS analysis of the enriched sample and 2 d for data analysis.
研究领域:
蛋白质组学
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生物化学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2021
·Vol. 9
·期 27
·15310-15320
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IF 12.732
Jichao Zhang,Jun Song,Lifang Liu,Peng Zhang,Yang Si,Shichao Zhang,Jianyong Yu,Bin Ding
Water pollution caused by oil has placed a significant burden on the ecosystem and human health. However, the present membranes suffer from a serious oil fouling issue during long-term oily wastewater remediation, which has limited their practical applications. Herein, inspired by the taro leaf, we develop a biomimetic nanofibrous membrane composed of BiOBr microspheres anchored on electroconductive SiO2/polyaniline (PANI) core–shell nanofibers. Due to the surface multiscale structures and hydrophilic matrix, the biomimetic membrane shows intriguing superhydrophilicity, underwater superoleophobicity, and low-oil-adhesion. Benefitting from the high porosity and sub-micrometer pores, the membrane exhibited superior capability for separating highly emulsified oil-in-water emulsions with a promising permeation flux of 6140 L m−2 h−1 and a high separation efficiency (total organic carbon content <5 mg L−1). Importantly, the presence of BiOBr/PANI heterojunction arrays with visible light catalytic activity and 3D PANI electroconductive networks effectively imparts desirable self-cleaning properties, maintaining a high flux recovery ratio >98%. The synthesis of such biomimetic nanomaterials may open up new avenues for developing high-performance separation materials for the purification of large volumes of wastewater.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2015
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IF 2.858
Jing-jing Rong,Ming Liang,Feng-qi Xuan,Jing-yang Sun,Li-jun Zhao,Hui-zhen Zhen,Xiao-xiang Tian,Dan Liu,Quan-yu Zhang,Cheng-fei Peng,Tian-ming Yao,Fei Li,Xiao-zeng Wang,Ya-ling Han,Wei-ting Yu
To date, transcatheter arterial embolization (TAE) has become a standard treatment to control intracavitary bleeding as an alternative to surgery. Due to excellent biocompatibility and no residual in vivo , biodegradable materials are preferred in TAE. However, gelfoam is the only commercially available biodegradable embolic material used to treat blunt trauma of solid abdominal viscera until now, and controversial on its stability and reliability never stopped in the past five decades. In this study, a new biodegradable macromolecule material (thrombin-loaded alginate-calcium microspheres, TACMs) was prepared using electrostatic droplet techniques and a special method was developed for hemostatic embolization. Thrombin was successfully loaded into microspheres with high encapsulation efficiency and drug loading capacity. A burst release of TACMs was observed at early stage and sustained release later on, with the activity of thrombin preserved well. The strength of TACMs mixed thrombus, which was used as embolic agent, increased in a dose-dependent manner after TACMs were added. In addition, the TACMs were verified to be of no cytotoxicity and systemic toxicity, and biodegradable in vivo . Finally, the results of preliminary applications revealed that the TACMs could serve as an effective and promising embolic material for blunt trauma and hemorrhage of solid abdominal viscera.
研究领域:
医学
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生物材料学
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产品关联
DOI
PubMed
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2017
·Vol. 23
·期 41
·9937-9945
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IF 5.317
Yunmei Pan,Jiajia Zhang,Hongbin Lu
Graphical A good egg : Highly uniform yolk–shell MoS 2 @C microspheres were synthesized as lithium-ion battery (LIB) anodes, with the inner cavity between the carbon shell and MoS 2 core easily tailored through a novel etching technique (see scheme). The rationally designed microsphere anode exhibits high reversible capacity, and excellent cycling stability and rate performance. The etching strategy developed may provide a new approach for the preparation of other carbon-based hollow nanostructures As an electrode material for lithium-ion batteries (LIBs), MoS 2 has attracted much attention because of its high capacity and low cost. However, the rational design of a novel electrode structure with a high capacity, fast charge/discharge rate, and long cycling lifetime remains a great challenge. Herein, a environmentally friendly etching strategy is reported for the construction of monodisperse, inner void-controlled yolk–shell MoS 2 @carbon microspheres. The resulting anode reveals an initial discharge capacity up to 1813 mAh g −1 , a high reversible capacity (1016 mAh g −1 ), excellent cycling stability (200 cycles), and superior rate performance. Such microspheres consist of nanosized MoS 2 yolks (≈280 nm), porous carbon shells (≈25 nm) and well-controlled internal voids in between, opening a new pathway for the optimization of the electrochemical properties of MoS 2 -based anodes without sacrificing their capacity. In addition, this etching strategy offers a new method for the development of functional, hollow MoS 2 -based composites.
研究领域:
材料科学
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电化学
·
纳米技术
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 7
·3084-3090
·
IF 9.931
Xuefeng Zhang,Guohua Zhang,Shuai Wang,Shijie Li,Shuqiang Jiao
Cathode materials with a porous structure are important in the development of aluminum-ion batteries (AIBs). In this research, porous microspheric copper oxide (PM-CuO) composed of stacked numerous bitty nanorods has been synthesized for use in AIBs. Using a simple one-pot hydrothermal process, the-as-synthesized PM-CuO possess a large specific surface area of 21.61 m2 g−1 and a pore volume of 0.179 cm3 g−1. These unique porous features allow PM-CuO to improve the electrochemical performance in the assembled AIBs, which exhibit a high initial charge and discharge capacity of 270.62 and 250.12 mA h g−1 (current density of 50 mA g−1), respectively. In the cycling performance, discharge capacity was observed to remain over 130, 121 and 112 mA h g−1 at current densities of 50, 100 and 200 mA g−1, respectively. The favorable properties of PM-CuO cathode materials are attributed to the unique porous structure and this makes them a promising potential material for use as energy storage devices.
研究领域:
材料科学
·
能源存储
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Jing Li,Qian Li,Lu-shuang Li,Li Xu
Perfluoroalkyl and polyfluoroalkyl substances are priority contaminants of global concern. It is urgent to remove them from the environment. Adsorption is an efficient approach, but the adsorption capacity and regeneration of adsorbent were not satisfactory. In the present study, mesoporous melamine-formaldehyde resin microsphere (MMFRS) was fabricated through suspension polymerization. Owing to its mesoporous property and large anion-exchange capacity of 0.3 mmol/g, MMFRS was applied to the adsorption of perfluorooctanoic acid, a model target. The sorption kinetics obeyed pseudo-second-order equation and the sorption isotherms fitted both Freundlich and Langmuir models well. MMFRS exhibited a superiority over commercial powdered activated carbon on the adsorption amount. The sorption could reach equilibrium within 24 h. In addition, the material could be easily and economically regenerated by dilute NH 3 ·H 2 O (7.5 mM); a regeneration percentage (>85%) after 20 recycles was obtained. This study provides a facile, environmentally-friendly and low energy-consumption strategy for removal of perfluorooctanoic acid from aqueous solution in waste-water treatment.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
高影响因子
TALANTA
·
2017
·
IF 4.162
Jingfan Xie,Guanqun Zhong,Changqun Cai,Chunyan Chen,Xiaoming Chen
As biomarkers of many diseases, glycoproteins are of great significance to clinical diagnostics. However, the determination of low abundant glycoproteins in complex biological samples without any pretreatment process is still a problem. In this study, a rapid and convenient separation method for highly efficient enrichment of glycoproteins is reported, based on pH double-responsive imprinted magnetic microspheres . Thin imprinted polymer shells were fabricated onto the surface of magnetic microspheres by free radical polymerization , using 2-(Dimethylamino) ethyl methacrylate as pH-sensitive monomer , 4-vinylphenylbronic acid as boronate affinity monomer, and ovalbumin (OVA) as template molecule. Combining the advantages of pH-sensitive monomer and boronate affinity monomer, rapidly capture-release of OVA could be modulated by changing solution pH. Moreover, high absorption ability (81.2 mg/g) was achieved within about 10 min. This study provided responsible way to imprint glycoproteins and showed great potential for glycoprotein detection in clinical diagnostic.
研究领域:
分析化学
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生物技术
·
材料科学
·
临床诊断
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）