LANGMUIR
·
2015
·
IF 4.457
Zhihai Cao,Hangnan Chen,Shudi Zhu,Wenwen Zhang,Xufang Wu,Guorong Shan,Ulrich Ziener,Dongming Qi
Janus Pd/SiO2 nanocomposite particles (NCPs) were successfully synthesized through a combination of the sol–gel process of tetramethoxysilane in inverse miniemulsions and in situ reduction of Pd salts via a gas diffusion process of hydrazine. The formation of Pd nanoparticles (NPs) was verified by X-ray diffraction. The Janus morphology of the Pd/SiO2 NCPs was confirmed by microscopic observation. The Pd/SiO2 NCPs displayed a mesoporous structure. The content of Pd NPs in the NCPs could be conveniently adjusted by the K2PdCl4 loading. A formation mechanism of the Janus Pd/SiO2 NCPs was proposed. The mesoporous Janus Pd/SiO2 NCPs show good catalytic activity toward the reduction of p-nitrophenol with NaBH4.
研究领域:
材料科学
·
纳米技术
·
催化化学
·
胶体与界面化学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2013
·
IF 2.224
Kejie Yu,Xuebin Zhang,Hongwu Tong,Xiangyan Yan,Shaomin Liu
Fibrous monodisperse core–shell structured Fe 3 O 4 /SiO 2 /KCC-1 nanoparticles were synthesised successfully through a surfactant-templated microemulsion formation process. The structure and morphology of the synthesised nanoparticles were investigated by scanning electron microscopy , transmission electron microscopy , superconducting quantum interference device susceptometer, X-ray diffraction, thermogravimetric analysis and N 2 adsorption/desorption. These nanoparticles showed monodisperse spherical morphology, high magnetism , good thermal stability , large surface area , direct channels, easily accessible large pores and narrow size distribution. A mechanism for the synthesis of these nanoparticles was proposed and explained. Adsorption experiments indicated that the as-prepared materials had good adsorption capacity for dye and could perform a fast transfer of molecules, indicating its promising application in purification of industrial wastewater, drug delivery and so on.
研究领域:
纳米医学
·
材料科学
·
环境工程
·
生物材料
·
药剂学
·
胶体与界面化学
✓ 已验证
DOI
高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2021
·Vol. 91
·期 4
·726-731
·
IF 0.868
Xu Y.,Hu Y.,Bao Q.,Zhang J.,Liu B.,Zhang Z.,Zhang Q.,Zhang H.
Copper phyllosilicate has been synthesized from a solution of sodium silicate and copper nitrate by co-precipitation under acidic conditions followed by reduction under H 2 flow for using it as the Cu/SiO 2 catalyst. The catalyst has been characterized by XRD, XPS, FTIR and Raman spectra, EDS, BET, and TEM. It is confirmed that only copper phyllosilicate and SiO 2 exist in the catalyst precursor, and there has been no CuO. Physical and chemical properties of Cu/SiO 2 catalyst have been evaluated. The Cu/SiO 2 catalyst has not only a large specific surface area and abundant mesopores but also the advantages of high dispersion of copper nanoparticles and the combination of Cu 0 and Cu + . The catalyst demonstrates high activity and selectivity in the reaction of 2-butanol dehydrogenation to methyl ethyl ketone.
研究领域:
催化化学
·
材料科学
·
物理化学
·
纳米材料
·
有机合成
✓ 已验证
DOI
高影响因子
Nanoscale
·
2016
·Vol. 8
·期 46
·19263-19269
·
IF 7.76
Pengfei Zhou,Zhen Zhang,Huanju Meng,Yanying Lu,Jun Cao,Fangyi Cheng,Zhanliang Tao,Jun Chen
We reported a one-step dry coating of amorphous SiO2 on spherical Ni-rich layered LiNi0.915Co0.075Al0.01O2 (NCA) cathode materials. Combined characterization of XRD, EDS mapping, and TEM indicates that a SiO2 layer with an average thickness of ∼50 nm was uniformly coated on the surface of NCA microspheres, without inducing any change of the phase structure and morphology. Electrochemical tests show that the 0.2 wt% SiO2-coated NCA material exhibits enhanced cyclability and rate properties, combining with better thermal stability compared with those of pristine NCA. For example, 0.2 wt% SiO2-coated NCA delivers a high specific capacity of 181.3 mA h g−1 with a capacity retention of 90.7% after 50 cycles at 1 C rate and 25 °C. Moreover, the capacity retention of this composite at 60 °C is 12.5% higher than that of pristine NCA at 1 C rate after 50 cycles. The effects of SiO2 coating on the electrochemical performance of NCA are investigated by EIS, CV, and DSC tests, the improved performance is attributed to the surface coating layer of amorphous SiO2, which effectively suppresses side reactions between NCA and electrolytes, decreases the SEI layer resistance, and retards the growth of charge-transfer resistance, thus enhancing structural and cycling stability of NCA.
研究领域:
材料科学
·
电化学
·
储能
·
电池技术
✓ 已验证
DOI
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 31
·16443-16450
·
IF 6.895
Yan Bao,Yuanxia Zhang,Jianzhong Ma
Durable superhydrophobic coating is attractive due to its long-term superhydrophobicity, anti-fouling and self-cleaning properties. However, the fabrication of durable superhydrophobic coatings on a fragile surface, including leather and paper, is still a challenge due to its bad resistance to harsh environments such as high temperature, high pressure and strong acid or strong base. Herein, we developed a universal way to fabricate long-lasting superhydrophobic coating on leather via amphiphilic Janus particles, which have one of the semispheres functionalized with hydrophobic 1-dodecanethiol and the other semisphere functionalized with hydrophilic β-mercaptoethylamine. Polyurethane with isocyanate end groups was sprayed on the leather surface as an intermediate layer to strongly link Janus particles with leather via cross-linking. Moreover, amphiphilic Janus particles were fabricated from hollow SiO2 particles via a thiol–ene click reaction due to its low density. The superhydrophobic coating on leather possessed a high water contact angle of 162.2°. Furthermore, it still retained excellent hydrophobicity with a water contact angle of 154° after 140 cycles of abrasion using sandpaper. This study not only provides a novel method for the fabrication of amphiphilic hollow SiO2 Janus nanoparticles, but also resolves the difficulties in constructing long-lived superhydrophobic coatings on fragile surfaces by existing methods. Meanwhile, the present study also suggests a potential way to translocate functional Janus microcapsules, which may give some significant suggestions on the future nanoparticle design for drug delivery and energy storage.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemosensors
·
2020
·Vol. 8
·期 4
·109
·
IF 3.108
Yuhang Zhang,Dongliang Cheng,Zicheng Wu,Feihu Li,Fang Fang,Zili Zhan
The conventional CO electrochemical gas sensor uses aqueous H2SO4solution as electrolyte, with inevitable problems, such as the drying and leakage of electrolyte. Thus, research on new alternative electrolytes is an attractive field in electrochemical gas sensors. In this paper, the application of a new fumed SiO2gel electrolyte was studied in electrochemical gas sensors. The effects of fumed SiO2and H2SO4contents on the performance of the CO gas sensor were investigated. The results showed that the optimized composition of the SiO2gel electrolyte was 4.8% SiO2, 38% H2SO4, and 0.005% polyvinyl alcohol (PVA). Compared with aqueous H2SO4, the gel electrolyte had better water retention ability. The signal current of the sensor was proportional to the CO concentration. The sensitivity to CO was 78.6 nA/ppm, and the response and recovery times were 31 and 38 s, respectively. The detection limit was 2 ppm. The linear range was from 2 to 500 ppm. The gel electrolyte CO sensor possesses equivalent performance to that with aqueous electrolyte.Keywords:fumed SiO2;gel electrolyte;electrochemical sensor;CO gas sensor
研究领域:
材料科学
·
传感器技术
·
环境监测
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Chaoyou Tao,Lin Zhang
Multifunctional thin films with superhydrophilicity, broadband antireflective performance, humidity resistance and outstanding mechanical robustness are essential as for their wide applications. However, so far, it remains a big challenge to take into consideration all these properties simultaneously due to the structural contradiction. Herein, we develop an effective dip-coating process to prepare hybrid thin films with mechanical robustness, high transmittance, super-durable moisture resistance, excellent photocatalytic activity and durable superhydrophilicity. Three different nanoparticles were deposited sequentially to construct the above thin film and the maximum transmittance of this particular thin film reached ∼96.0%. The film surface showed an excellent superhydrophilicity (water contact angle ≈3.0°), and antifogging property. The superhydrophilic thin film could keep its property for more than 20 days. The transformation from hydrophilicity to superhydrophilicity of the thin film could be readily realized by UV irradiation. Moreover, its self-cleaning property could be retained after reduplicative storage and UV illumination cycles. Sponge washing test, water drop impact, pencil hardness test and tape peeling test revealed that the thin film possessed outstanding mechanical robustness. Methylene blue photodegradation was chose to weigh the photocatalytic activity of the hybrid thin film. In addition, the thin film shows excellent humidity-resistance at high temperature, and the excellent performance is due to its closed-surface structure. The closed-surface multifunctional thin films pave way toward use in solar cells, high-rise architecture windows under severe climate conditions.
研究领域:
材料科学
·
纳米技术
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2021
·Vol. 47
·期 1
·77-90
·
IF 2.914
Shen Bin,Dong Chencheng,Yang Bo,Xing Mingyang,Zhang Jinlong
Abstract A novel defect-induced inorganic photoluminescence powder silica (CSI-SiO 2 ) nanomaterial was successfully synthesized via a facile method, where Cs + was doped into SiO 2 by ion exchange, and oxygen vacancy defects were produced during a vacuum calcination treatment at high temperature. CSI-SiO 2 was characterized by scanning electron microscopy, X-ray diffraction and photoluminescence spectroscopy. The result showed that CSI-SiO 2 contained merely three elements including Cs, Si, and O. Compared with conventional fluorescent materials, the preparation method of fluorescent material (CSI-SiO 2 ) didn’t need the precursor of heavy metals, rare earth metals and other harm contents, making it capable to be an environmentally friendly candidate. More importantly, CSI-SiO 2 exhibited hyper-stable photoluminescence performance in harsh conditions including strong acidic, weak alkaline, moist and high temperature conditions, which can be applied in security marking. Graphic abstract The mechanism diagram of material CSI-SiO2 for defect-induced photoluminescence.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Caiyun Cao,Zichao Li,Yanqiang Li,Guoqiang Wang,Shuping Yuan,Hongliang Li,Peizhi Guo,X.S. Zhao
Ir nanoparticles have been synthesized by using a sample hydrothermal method while well dispersed Ir@SiO 2 composite microspheres could be obtained hydrothermally after adding SiO 2 microspheres into the synthesis system. Particles of Ir formed on the surface of SiO 2 microspheres were well crystalline similar to the pure Ir nanoparticles. Both the glassy carbon electrodes modified by Ir nanoparticles and Ir@SiO 2 composite microspheres showed weak electrochemical activities toward oxidation of dopamine and ascorbic acid . However, the Ir nanoparticles modified gold electrode displayed an obvious catalytic activity toward electrooxidation of either dopamine or ascorbic acid. For the gold electrode modified with Ir@SiO 2 composite microspheres, the electrochemical behavior could be affected obviously by the quantity of the electrocatalyst on the surface of bare gold electrode. The relationship between structure and property of both samples have been studied and analyzed based on the experimental data.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
NANO
·
2015
·
IF 1.09
YAN WANG,YAOFENG ZHU,YAQIN FU
A novel shear thickening fluid (STF) obtained from a halloysite nanotube (HNT) and SiO 2 compounded system was successfully prepared using HNT and nano- SiO 2 as dispersed phases and polyethylene glycol 200 (PEG200) as the dispersion medium. The steady rheological behavior of the STF was investigated using a high-speed rotational rheometer, and the dispersion states of SiO 2 and HNT in PEG200 were characterized by field emission scanning electron microscopy and transmission electron microscopy. Results show that HNT and SiO 2 coexisted in the compounded system, and presented a special state that was both uniformly dispersed and partially enriched. The shear thickening effect of the STF was significantly enhanced by the enrichment of SiO 2 loaded on the surface of HNTs in the compounded system.
研究领域:
材料科学
·
流变学
✓ 已验证
产品关联
DOI
高影响因子
KEY ENGINEERING MATERIALS
·
2018
·
IF 0
Dao Yan Feng,Yu Xiao Li,Hui Yang,Xing Zhong Guo
Hierarchical porous SiO2@C@MnO2 monoliths have been fabricated by two step approaches: Elemental carbon was covered the internal surface of porous silica monoliths with impregnation and carbonized in inert atmosphere, and MnO2 was directly grown on the skeleton of SiO2@C accompanied by redox reaction between C and KMnO4. The effects of glucose and KMnO4 concentrations, and hydrothermal reaction on the morphology of MnO2 particles on the surface of SiO2 monoliths were investigated in detail. The results showed that the optimal factors of reaction condition involved 0.08 mol·L-1 glucose solution, 0.03 mol·L-1 KMnO4 solution and the reaction time of 5 h. SEM images and BET results indicated that the macroporous structure of the as-prepared material was preserved after modification, while the specific surface area and pore volume decreased with increasing amount of MnO2 to some degree. The XPS spectra of SiO2@C@MnO2 is in good agreement with reported data in MnO2. The crystal phase of MnO2 was α-MnO2 after thermal treatment at the temperature of 600 °C from the XRD patterns. Three-dimensional porous well-defined morphological SiO2@C@MnO2 be promising materials for the catalytic elimination of air pollutants since large quantities can be obtained from porous structure combined with α-MnO2 equipped with high active performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
OPTICAL MATERIALS
·
2018
·
IF 2.32
Kexu Chen,Ming Kang,Min Liu,Simin Shen,Rong Sun
In order to complete the fluorescent labeling of SiO 2 microspheres , a kind of di-functional ligand was synthesized and purified, which could not only coordinate rare earth ions but also react with the active groups to bond host materials with an alkoxysilane groups. Fourier transform infrared spectroscopy (FT-IR), 1 H NMR spectra , MS spectra, field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS) and luminescence spectrophotometer were used to study the structure of di-functional ligand and properties of fluorescent coupling agent and fluorescent labeled SiO 2 microspheres. The optimal experiment conditions were acquired as follows: molar ratio as 1: 4 ( M DBM : M ICPTES ), reaction time at 6 h and reaction temperature as 65 °C (yield up to 40%) through the orthogonal experiment and purification process. The results indicated that fluorescent coupling agent presented red photoluminesence of Eu 3+ ions at 610 nm, and the absolute quantum yield was 11%. On the other hand, the hydrolysis of the coupling agent reacted on the surface of SiO 2 microspheres and presented fluorescent labeling homogeneously.
研究领域:
材料科学
·
化学
✓ 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）