Crystals
·
2018
·Vol. 8
·期 11
·397
·
IF 2.144
Lingxiao Chen,Hang Liu,Linghao Liu,Yifan Zheng,Haodong Tang,Zongjian Liu
Ni nano-micro structures have been synthesized via a solution reduction route in the presence of ethylenediamine (EDA) under strong alkaline conditions. The phase composition, morphology, and microstructure of the resulting products are investigated by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The presence of EDA plays an important role in the formation of Ni nano-micro structures, and microflowers or microspheres assembled from nanosized horns can be produced by changing the amount of EDA. The size of Ni nano-micro structures is dependent on the NaOH concentration, and long chains assembled from Ni nano-micro structured microspheres can be obtained by reducing the amount of NaOH solution used. The role of both EDA and NaOH in the reduction of Ni (II) to Ni, as well as in the growth of Ni nano-micro structures, has been discussed, and a possible formation mechanism of these Ni nano-micro structures has been proposed based on the experimental results.Keywords:ethylenediamine;microspheres;nanohorns;nano-micro structures;nickel
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Bingqi Li,Shengping You,Wei Qi,Yuefei Wang,Rongxin Su,Zhimin He
Lignin sub-micro spheres have drawn wide attention because of their biodegradable, biocompatible and large surface area. However, the formation of stable and tunable lignin micro/nanospheres are limited by lignin source, preparation method and aggregation characteristics. Amphiphilic lignin tends to form aggregates in water under two tunable forces, including hydrophobic and hydrophilic interactions. Herein, we rationally modify the amphiphilic interface of corncob lignin (CL) with the chemical modification of four types of n-alkane to tune its amphiphilicity. Four alkylated CLs with similar chemical properties, but different interfacial interactions have been successfully synthesized. We find that n-alkane and aromatic skeleton contribute to the hydrophobic interactions to induce the aggregation of CL. The results show that modulating the hydrophobic and hydrophilic interactions can successfully promote the formation of CL sub-micro spheres (CLS) with tunable surface properties. The higher hydrophobic interactions and longer alkyl chain, the smaller size of CLS. The average diameters of CLS can be reduced from 400 nm to 100 nm by increasing the length of alkyl chain. What’s more, CLS can disperse stably in water for 60 days and in acid-base environment at pH 4–10 for 30 days.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 43
·22678-22687
·
IF 3.708
Qing Hu,Yuli Li,Guohou Miao,Naru Zhao,Xiaofeng Chen
We report a facile method for fabricating monodispersed mesoporous bioactive glass sub-micron spheres (MBGS) using dodecylamine (DDA) as a catalyst and template agent in a sol–gel process by self-assembly between a neutral organic surfactant and neutral inorganic precursor (S0I0). Moreover, we investigate the effect of sub-micron particle size on the physicochemical properties, apatite-forming ability, and biocompatibility of MBGS. Results showed that all samples exhibited regular spherical morphology and favorable mono-dispersibility. The average particle diameters of MBGS (200–800 nm) were controlled by adjusting the concentration of DDA. All samples induced the formation of rod-like apatite precipitates, which closely resembled the natural nanoscale apatite crystal, showing their high apatite-forming ability. Furthermore, MBGS surfaces also supported the attachment and promoted proliferation of alkaline phosphatase (ALP) activity of MG-63 cells, showing the good biocompatibility of MBGS. MBGS-1 had the smallest particle size and it was found that it could significantly enhance MG-63 proliferation and differentiation because of the smaller particle size and higher specific surface area. It is hoped that this study may motivate the development and applications of submicron biomaterials for bone repair applications.
研究领域:
材料科学
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生物医学工程
·
骨组织工程
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2013
·
IF 2.072
Jun Liang,Huiru Ma,Wei Luo,Shouling Wang
Magnetite submicrospheres with an average size range of 90–490 nm were obtained by a facile polyol process. The effects of reaction conditions on the morphology and static magnetism of magnetite submicrospheres were studied when the reaction time, the concentration of component, and the types of the solvent or surfactant changed. The average size of primary crystals was controlled by changing the concentration of surfactant thus the superparamagnetism was obtained, meanwhile the average size of secondary clusters was tuned by changing the concentration of ferrous precursor FeCl 3 ·6H 2 O. The ratio of ethylene glycol and diethylene glycol , the concentration of NaAC, and the reaction time all exhibited novel effects on the morphology of magnetite submicrospheres facilitating our understanding about the synthesis mechanism. The synthesized magnetite submicrospheres were successfully used for photonic crystal .
研究领域:
材料科学
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纳米技术
·
磁性材料
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生物医学工程
✓ 已验证
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2017
·
IF 3.615
Yajun Du,Lingping Cheng,Long Chen,Yunchao He,Yaling Wu,Shanshan He,Yanxiong Ke
Sub-2 μm large-pore monodispersed mesoporous silica spheres (MMSS) were synthesized by using mixed non-ionic surfactants of dodecylamine (DDA) and dodecylamine polyoxyethylene ether (AC1210) as templates through an alkali-catalyzed silica sol–gel technique combined with the template method. Methanol-H 2 O volume ratio on morphology was researched in detail. In addition, by using hydrothermal treatment , the average pore size of MMSS could be enlarged to 11 nm from 4.4 nm. The mesoporous silica particles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), laser particle size analyzer, X-ray diffraction, N 2 physisorption technique. The synthesized sub-2 μm monodispersed mesoporous silica microspheres were successfully functionalized by dimethyloctadecylchlorosilane and used as a packing material in high performance liquid chromatography (HPLC).
研究领域:
材料科学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 8
·4314-4322
·
IF 7.443
Wei Wei,Rongjie Lu,Haojie Xie,Yifan Zhang,Xue Bai,Li Gu,Rui Da,Xiaoya Liu
Nitrogen-enriched and organic–inorganic hybrid polymer submicro-spheres based on highly cross-linked poly(cyclotriphosphazene-co-4,4′-sulfonyldiphenol) (PZS) were prepared using one-step precipitation copolymerization route. The chemical structure and morphology of the submicro-spheres were characterized. The adsorption behaviors of the submicro-spheres towards different organic dyes in an aqueous solution were investigated systematically. The results showed that PZS submicro-spheres could effectively adsorb methylene blue (MB), Bismarck brown Y (BY), neutral red (NR), rhodamine B (RhB), and calcein (Cal) with high adsorption capacities, but they could hardly adsorb orange G (OG), Ponceau S (PS), and methyl orange (MO), indicating that PZS submicro-spheres could adsorb guest dyes selectively. The adsorption process was found to follow the pseudo-second-order kinetic model rather than the pseudo-first-order one. Isotherm studies revealed that the Langmuir model was more suitable for describing the adsorption behavior of the PZS submicro-spheres than the Freundlich model. A probable mechanism based on the unique host–guest interactions between the submicro-spheres and the dyes was proposed and experimentally verified to explain the selective adsorption. The nitrogen-enriched PZS submicro-spheres possess electron-donating and proton-attracting abilities and could act as bases, and thus the dyes that are classified as Lewis acids (electron acceptor) and/or Brønsted acids (proton donor) could be selectively adsorbed onto the submicro-spheres by acid–base interactions. Because of the selective adsorption behavior towards different organic dyes, PZS submicro-spheres also exhibited a strong ability for separating dye mixtures in an aqueous solution.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY COMMUNICATIONS
·
2012
·
IF 4.859
Yunxian Qian,Yuanfu Deng,Zhicong Shi,Yubo Zhou,Quanchao Zhuang,Guohua Chen
Spinel LiMn 1.5 Ni 0.5 O 4 (LMNO) sub-micrometer-sized spheres were prepared in one step using porous MnCO 3 microspheres as a self-supporting template. The LMNO spheres were characterized by XRD , SEM and TEM. The obtained LMNO was in a well-crystallized cubic phase with little impurity. It showed high rate capability and excellent cycling stability as a cathode material for lithium ion batteries . Initial discharge capacities of 122.0, 120.3, 119.5 and 112.1 mAh g − 1 were found at 2, 3, 5 and 10C respectively with 1C being 146.7 mA g − 1 . Their capacity retentions are 92, 91, 82 and 79% respectively after 500 cycles. The as-prepared LMNO is a promising cathode material for high power and long-life lithium ion batteries .
研究领域:
材料科学
·
电化学
·
能源存储
·
无机功能材料
·
电池技术
✓ 已验证
DOI
高影响因子
Science China-Materials
·
2017
·Vol. 60
·期 4
·304-314
·
IF 3.956
Zhu Kunlei,Sun Yinghui,Wang Rongming,Shan Zhongqiang,Liu Kai
High-tap density electrode materials are greatly desired for Li-ion batteries with high volumetric capacities to fulfill the growing demands of electric vehicles and portable smart devices. TiO 2 , which is one of the most attractive anode materials, is limited in their application for Li-ion batteries because of its low tap density (usually <1 g cm −3 ) and volumetric capacity. Herein, we report uniform mesoporous TiO 2 submicrospheres with a tap density as high as 1.62 g cm −3 as a promising anode material. Even with a high mass loading of 24 mg cm −2 , the TiO 2 submicrospheres have impressive volumetric capacities that are more than double those of their counterparts. Moreover, they can be synthesized with ~100% yield and within a reaction time of ~6 h by optimizing the experimental conditions and formation mechanism, exhibiting potential for large-scale production for industrial applications. Other mesoporous anode materials, i.e., high-tap density mesoporous Li 4 Ti 5 O 12 submicrospheres, are fabricated using the generalizedmethod. We believe that our work provides a significant reference for the industrial production of mesoporous materials for Li-ion batteries with a high volumetric performance.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机合成
✓ 已验证
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 10
·3774
·
IF 3.4
Jingxiang Chen,Cheng Fu,Junye Li,Weiyu Tang,Xinglong Gao,Jingzhi Zhang
Micro and sub-micro-spherical copper powder slurries were elaborately prepared to fabricate different types of porous coating surfaces. These surfaces were further treated with low surface energy modification to obtain the superhydrophobic and slippery capacity. The surface wettability and chemical component were measured. The results showed that both the micro and sub-micro porous coating layer greatly increased the water-repellence capability of the substrate compared with the bare copper plate. Notably, the PFDTES-fluorinated coating surfaces yielded superhydrophobic ability against water under 0 °C with a contact angle of ~150° and a contact angle of hysteresis of ~7°. The contact angle results showed that the water repellency of the coating surface deteriorated with decreasing temperature from 10 °C to −20 °C, and the reason was probably recognized as the vapor condensation in the sub-cooled porous layer. The anti-icing test showed that the ice adhesion strengths of the micro and sub-micro-coated surfaces were 38.5 kPa and 30.2 kPa, producing a 62.8% and 72.7% decrease compared to the bare plate. The PFDTES-fluorinated and slippery liquid-infused porous coating surfaces both produced ultra-low ice adhesion strengths of 11.5–15.7 kPa compared with the other non-treated surfaces, which showed prominent properties for anti-icing and deicing requirement of the metallic surface.Keywords:superhydrophobic surface;anti-icing;porous coating;wettability
研究领域:
材料科学
·
表面工程
·
防冰技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
·
2021
·
IF 3.189
Weiwei Zhang,Jiahao Liu,Luobin Zhang,Jianqiang Wang,Zheng Zhang,Jintao Wang,Hao Liu,Hongtao Chen,Mingyu Li
In the application of electronic products, it is critical for conductive adhesives to ensure high electrical conductivity and good adhesion reliability. In this study, isotropic conductive adhesives (ICAs) with high conductivity and low percolation threshold can be achieved by making full use of the synergistic effect of micron spherical and flaky silver-coated copper (Cu@Ag) conductive fillers . The flaky Cu@Ag powder prepared by electroless plating was chosen as the main conductive filler, and the spherical core-shell structure Cu@Ag powder was used as an auxiliary conductive filler to be dispersed in the flaky Cu@Ag particles, providing more possibilities for building a large number of conductive bridges. In this study, the Cu@Ag powder was synthesized to eliminate the disadvantages of Cu oxidation and Ag electrochemical migration, while making the ICAs low cost and favourable conductivity. Furthermore, the curing parameters were optimized for the matrix resin in corresponding experiments. The results showed that a combination of spherical and flaky Cu@Ag powders in ICAs could not only significantly reduce the percolation threshold and the bulk resistivity but also increase the shear strength compared with the single component. In particular, the bulk resistivity of the optimum sample was 1.95 × 10 −3 Ω cm, and the shear strength was 22.69 MPa when the filler content was only 60 wt%. Hence, the ICAs filled with spherical and flaky Cu@Ag will pave the way for high-performance and low-cost ICAs in the electronics packaging industry.
研究领域:
材料科学
·
电气工程
·
化工
·
电子封装
✓ 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）