JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 36
·17277-17290
·
IF 4.682
Wan Xiang,Wang Jiafei,Wang Dian,Xu Qin,Xie Fazhi,Qu Qishu
In a mixed solvent composed of acetonitrile and ethanol, tetrabutyl orthotitanate (TBOT) was quickly introduced into the pores of the core–shell silica particles (SiO 2 @ d SiO 2 ) using the coordination bond formed between N and Ti. Since all the hydrolysis reactions of TBOT occurred in the pores, SiO 2 @ d SiO 2 spheres coated with TiO 2 (S@S@TiO 2 ) with an effective loading of TiO 2 as high as 74% were obtained. Because all TiO 2 nanoclusters are located in the pores, their growth is restricted by the pores. So the size of crystalline grains in the pores of the shell slowly increases with the increase in the calcination temperature. Due to the confined growth of TiO 2 nanoclusters, S@S@TiO 2 still maintains the anatase phase when the calcination temperature is as high as 1050 °C, which is significantly higher than the maximum thermal stability temperature of 900 °C reported in the literature. When used as photocatalysts for the degradation of Rhodamine B under UV irradiation, the catalytic activity of S@S@TiO 2 calcined at 950 °C is 2.1 times higher than that of the commercial P25 TiO 2 photocatalyst. Graphical abstract
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
ANALYST
·
2020
·Vol. 145
·期 11
·3851-3856
·
IF 3.978
Tiantian Si,Licheng Wang,Xiaofeng Lu,Xiaojing Liang,Shuai Wang,Yong Guo
A new type of core–shell composite material was prepared and applied as a hydrophilic interaction liquid chromatography (HILIC) stationary phase. In this work, silica spheres were first modified with a bimetallic central metal–organic framework (ZnCoMOF) by a new strategy of static self-assembled in situ growth. This strategy was beneficial for increasing the electrostatic interaction between the MOF ligand and silica via introducing a sodium dodecylbenzenesulfonate (SDBS) group. The ZnCoMOF@silica stationary phase was characterized and evaluated in comparison with amino-modified and bare silica columns in terms of various polar analytes including eight nucleosides and nucleobases, seven carbohydrates, and multiple sulfonamides and antibiotics. The effects of organic solvent concentration, water content, the concentration of the salt and the pH of the buffer solution on the retention time were studied, which demonstrated the typical retention behavior of HILIC on the ZnCoMOF@silica column. Compared with most reported MOF-based stationary phases, the new composite material showed excellent hydrophilic properties and separation efficiency for various polar analytes. Moreover, the obtained stationary phase showed good reproducibility and stability. The relative standard deviation (RSD) of the retention time for repeatability was found to range from 0.1% to 0.6%, and the RSD of the retention time for stability was found to range from 0.3% to 0.7%. Furthermore, the column batch-to-batch reproducibility showed excellent preparation reproducibility, which few reported in most previous MOF@silica composite materials. This specific preparation method offers an easy and novel way to manipulate the amount of MOF particles on silica, which extends a universal way to produce various MOF@silica stationary phases by the method of static self-assembled in situ growth.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 292
·期 6
·1385-1393
·
IF 2.41
Li Qiu-Ping,Yan Bing
The luminescent nanoparticles were prepared by encapsulating the [LnL 4 ] − (Ln = Eu, Tb; L = BTFA, HFAA, TTFA, TFAA) complexes anion into the silicon framework. We firstly synthesized a series of novel siloxy-bearing lanthanide complex precursor, and then encapsulated them into the silica sphere by a modified Stöber process. As a result, four europium and two terbium tetrakis β-diketonate complexes functionalized silica sphere nanoparticles were obtained and characterized in detail using Fourier transform infrared spectra, X-ray diffraction, scanning electronic microscope, thermogravimetric analysis, luminescence excitation and emission spectroscopy, luminescence lifetime measurements, and diffuse reflectance UV–Vis spectroscopy. The result shows that these luminescent nanoparticles maintain the distinctive luminescence character of lanthanide chelate including broad excitation spectra, line-like emission spectra, high quantum efficiency, and long luminescent lifetime, which makes them great potential application in the synthesis of luminescent nanoparticle.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2018
·
IF 3.716
Qishu Qu,Yang Si,Han Xuan,Kehua Zhang,Xiaoming Chen,Yi Ding,Shaojie Feng,Han-Qing Yu,M. Asiri Abdullah,Khalid A. Alamry
Monodispersed core-shell silica spheres with fibrous shell structure and tunable pore size were prepared by using a one-pot oil-water biphase method. The pore size could be tuned from 7 nm to 37 nm by using organic solvents with different polarities as oil phase. The spheres synthesized by using benzene as organic solvent had the maximum pore size of 37 nm and possessed a surface area of 61 m 2 g −1 . The obtained wide pore core-shell silica spheres were applied for rapidly separating small molecules, peptides, small proteins, and large proteins with molecular weight up to 200 kDa. Since the pore size of the core-shell silica spheres was sufficiently large for the free access of all the solutes, sharp and symmetric peaks were obtained. The separation performance was as high as 264,531 plates m −1 for fluorene. The great efficient separation demonstrates that the wide pore core-shell silica spheres have a great potential for rapid analysis of both small and large solutes with high performance liquid chromatography.
研究领域:
材料科学
·
分析化学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2020
·
IF 5.006
Wanliang Yang,Meng Chen,Jiayuan Zhou,Yingnan Duan,Yinmin An,Mao Liu,Mengkui Tian
Porous carriers play an important role in the catalytic transformation of syngas into higher alcohols, which promises higher sustainability in C1 chemistry. In this work, a series of hierarchical hollow silica spheres (HHSS) supported Cu-Fe bimetal catalysts were successfully prepared through ultrasonic-assisted impregnation for higher alcohols synthesis from syngas. Structural characterization results indicate that the hierarchical hollow structure of HHSS support can be maintained and the Cu-Fe bimetallic nanoparticles are highly dispersed on HHSS surface. The catalytic performances of samples in the test of CO hydrogenation for higher alcohols synthesis were investigated. The results revealed that the conversion rate of CO and the selectivity of C 2+ OH alcohol increased first and then decreased with the decrease of the amount of Cu content in the Cu x Fe y @HHSS catalyst. The highest CO conversion, alcohol selectivity and STY ROH over Cu-Fe@HHSS catalyst are 65.1 %, 46.6 %, and 118.1 gkg −1 h −1 , respectively. It was found that a large number of CuFe 2 O 4 were formed in Cu-Fe@HHSS catalyst and also confirmed that the CuFe 2 O 4 spinel and CuO-CuFe 2 O 4 were converted to Cu-Fe 5 C 2 composite in the spent Cu-Fe@HHSS catalyst, which can enhance the synergy between Cu-Fe bimetals. Furthermore, copper and iron are highly dispersed on HHSS after the reaction, which enhances the structural stability of the catalyst. Based on the development and utilization of low-cost catalysts and the production of clean liquid fuels, HHSS has a great prospect of catalyst support in the energy field.
研究领域:
催化化学
·
能源化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yan Li,Jinxian Zhao,Aolue Yan,Yanhong Quan,Jun Ren
In the methanol dehydrogenation to methyl formate (MF), it is of primary importance to improve the selectivity toward MF through inhibiting decomposition of methanol to CO and H 2 . Herein, the copper catalysts supported on hierarchical hollow silica spherical (HHSS) were synthesized by the ammonia assisted deposition precipitation (ADP) method and tested in the reaction. The 5Cu/HHSS catalyst exhibits the superior activity with a turnover frequency (TOF MF ) value, while 10Cu/HHSS shows the optimal MF selectivity of 98.1 %. It is found that there is a positive correlation between TOF MF and Cu dispersion, as well as between MF selectivity and Cu 0 concentration. Thanks to the unique structure of HHSS with large cavities and abundant mesopores, the ADP method can facilitate a high dispersion of copper on silica and promotes the formation of more active Cu 0 sites, which therefore results in superior activity and MF selectivity of the Cu/HHSS catalysts in the methanol dehydrogenation to MF.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2011
·
IF 4.194
Jian-Hong Wu,Xiao-Shui Li,Yong Zhao,Weiping Zhang,Lin Guo,Yu-Qi Feng
A novel core–shell composite (SiO 2 – n LPD), consisting of micrometer-sized silica spheres as a core and nanometer titania particles as a surface coating, was prepared by liquid phase deposition (LPD). Here, we show the resulting core–shell composite to have better efficient and selective enrichment for mono- and multi-phosphopeptides than commercially available TiO 2 spheres without any enhancer. The material exhibited favorable characteristics for HPLC, which include narrow pore size distribution , high surface area and pore volume. We also show that the core–shell composite can efficiently separate adenosine phosphate compounds due to the Lewis acid–base interaction between titania and phosphate group when used as HPLC packings. After coating the silica sphere with titania by LPD, the silanol of silica spheres will be shielded and that the stationary phase, C 18 bonded SiO 2 –3LPD, could be used under extreme pH condition.
研究领域:
分析化学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2017
·Vol. 135
·期 8
·45839
·
IF 1.86
Gang Wei,Kaijie Dong,Qinze Liu,Tingting Gao,Jinshui Yao
A silica-sphere–poly(catechol hexamethylenediamine) (PCHA–SiO 2 ) composite was prepared via the one-step facile polymerization of catechol and hexamethylenediamine; this method uses a silica sphere as a hard template. The chemical structures and morphologies of this composite were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, and transmission electron microscopy. The adsorption experiments indicated that the PCHA–SiO 2 composite served as a very attractive adsorbent for Pb(II)-, Cu(II)-, and Cd(II)-ion removal at lower concentrations and had very good selective adsorption abilities for Pb(II) and Cu(II) ions in a solution contaminated with these three ions at higher concentrations. These interesting results may have been due to the reversible H + adsorption–desorption properties of the characteristic phenol amine structure of the PCHA–SiO 2 composite. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45839.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2016
·Vol. 23
·期 4
·1-8
·
IF 1.969
Wang Jun,Zhao Weiqian,Zhao Menglan,Chen Si,Li Wuke
The temperature-responsive luminescent nanocomposites were prepared by the combination of poly (N-isopropylacrylamide) (PNIPAM) with lanthanide-polyoxometalates/SiO 2 spheres, exhibiting controlled reversible luminescent behavior with change in temperature. The structures and properties of nanocomposites were characterized by transmission electron microscopy, scanning electron microscope, FT-IR, UV-vis, dynamic light scattering and luminescence spectra. The research shows that the nanocomposites in aqueous solution display “on–off” luminescence by simple temperature stimuli. For example, the hybrid nanocomposites of PNIPAM/Eu-polyoxometalate/SiO 2 in aqueous solution show bright red luminescence under UV light, which could be observed by the naked eye when the temperature is below the lower critical solution temperature (LCST), showing the “on” state. However, the red luminescence of nanocomposites in aqueous solution is significantly decreased when temperature is above LCST, showing the “off” state.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 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）