Optical Materials Express
·
2020
·Vol. 10
·期 12
·3215-3225
·
IF 3.064
Chen Junfan,Li Tao,Zhang Jie
A structured SERS substrate with high uniformity and sensitivity was fabricated orderly by hydrophilizing the monocrystalline silicon substrate, self-assembling a layer of dense polystyrene (PS) microsphere array on the silicon, and depositing a layer (5 nm, 10 nm, 20 nm, 30 nm or 50 nm) of silver film. Rhodamine 6G (R6G) was used as a probe to characterize the performance of Raman enhancement. Experimental results show that our sample with deposition of a 5 nm silver film (PS-Ag-5) can obtain a large number of spatially distributed local electromagnetic field hot spots, with an enhancement factor of over 108, which is several orders of magnitude higher than that of other samples. The sensitivity of PS-Ag-5 to the concentration of probe molecules and the optical enhancement effect of PS microspheres were also analyzed. This novel structured substrate can achieve considerable uniformity, and the calculated relative standard deviation (RSD) of the characteristic peak at 1650 cm-1 is approximately 8%.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Jie Hu,Yi Lu,Xiao-Fang Zhao,Yu-Qian Tang,Yuan-Zhou Li,Yu-Xuan Xiao,Zhi-Yi Hu,Bao-Lian Su,Xiao-Yu Yang
TiO 2 hierarchical microsphere assembled from anatase TiO 2 nanosheets has been successfully prepared and exhibited excellent catalytic activities of H 2 production and benzyl alcohol selective oxidized to benzaldehyde. These enhanced photoactivity can be mainly ascribed to the charge separation promoted by the surface F and nanosheet units, enhancement of substrate molecular transport profited from the hierarchical structure.
研究领域:
材料科学
·
光催化领域
✓ 已验证
产品关联
DOI
高影响因子
TRANSACTIONS OF TIANJIN UNIVERSITY
·
2018
·Vol. 25
·期 2
·101-109
·
IF 0
Yuan Caideng,Zhang Lei,Li Haichao,Guo Ruiwei,Zhao Meng,Yang Lan
In this study, we prepared and applied polymeric porous microsphere adsorbents with selectivity for Li + extraction from aqueous solution. We synthesized the adsorbents by suspension polymerization using methacryloyoxyme-12-crown-4 (M12C4) as a functional monomer, which had been synthesized from 2-hyroxymethyl-12-crown-4 and methacryloyl chloride. We verified the chemical composition by solid nuclear magnetic resonance ( 13 C-NMR) spectroscopy and observed the porous structure by scanning electron microscopy (SEM). We conducted adsorption isothermal and kinetic tests to determine the adsorption properties. It was found that the adsorbents showed high adsorption efficiency and an adsorption equilibrium time of 200 min. In addition, since the crown ether used in this work could form a stable complex with Li + , we observed good selectivity for Li + in the prepared solution compared with other ions such as Na + , K + , Mg 2+ , and Ca 2+ . We reused the adsorbents five times with no significant decrease in adsorptive capacity.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Xiuling Zhang,Li Ma,Mengyu Gan,Gang Fu,Meng Jin,Yanfang Zhai
Using hierarchical hollow MoS 2 microspheres constructed by ultrathin nanosheets as a framework to provide large active surface area, polyaniline (PANI) nanofibers are controllably assembled on their surfaces by in-situ oxidative polymerization of different amounts of aniline monomers. The morphology and structure of these resulting composites are characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD) spectroscopy analyses. In order to assess the electrochemical performances of the composites, cyclic voltammograms (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charging-discharging (GCD) tests are employed. The as-prepared MoS 2 /PANI-5 composite electrode delivers an enhanced specific capacitance about 633 F g −1 at the current density of 0.5 A g −1 , as well as shows a remarkable capacitance retention of 86.0% at 10 A g −1 after 1000 cycles. In addition, the energy density reaches to 31.7 W h kg −1 when the power density is 0.3 kW kg −1 . All the electrochemical tests indicate this composite has an application prospect as an electrode material for supercapacitors.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2016
·
IF 2.267
Jie Hou,Huichang Gao,Yingjun Wang,Delin Cheng,Xiaodong Cao
Modifying substrates through mineralization is a popular way to improve the osteogenic performance. Screening of the best mineralization characteristics on specific substrates for stem cells is meaningful but not fully studied. In this paper, poly(lactic-co-glycolic acid)/hydroxyapatite (PLGA/HA, PH) microsphere scaffolds with superficial pores were fabricated by a low-temperature fusion method. After the mineralization in the 5× stimulated body fluid (SBF) for 0, 7, 12 and 24 h, four mineralized scaffolds (MPH-0, MPH-7, MPH-12 and MPH-24) with different apatite topographies were obtained. It was found that the surface of MPH-7 was evenly decorated with abundant micro-pores, MPH-12 with dense and plain apatite layer, and MPH-24 with small spherical bumps. The responses of mouse bone mesenchymal stem cells (mBMSCs) to the four scaffolds were further studied. The results showed that MPH-7 and MPH-24 had more obvious effects on mBMSCs attachment, proliferation and differentiation than MPH-0 and MPH-12. This work indicated that to obtain the maximum improvement, the mineralization characteristics had to be carefully chosen. This was noteworthy in the chemical modification of surfaces to form the functionalized scaffolds for bone repair.
研究领域:
生物材料
·
组织工程
·
干细胞研究
·
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2016
·
IF 2.693
Zhenhu Song,Fang Wang,Jian Qiang,Zhijie Zhang,Yahui Chen,Yong Wang,Wei Zhang,Xiaoqiang Chen
We developed a simple and sensitive hydrogel sensor in the form of microspheres by using fluorescence probe encapsulated within a hydrogel matrix for the detection of Hg 2+ . The traditional fluorescence probes suspended in solution are not transportable and recoverable. To overcome these disadvantages, we devised poly(ethylene glycol) diacrylate-based hydrogel microspheres in which fluorescence probe ( R19S ) was embedded at high density. The functionalized hydrogel microspheres were prepared by combining a microfluidic device with UV light . The hydrogel microspheres-based sensor exhibited good selectivity to Hg 2+ among various metal ions and high sensitivity with a detection limit of 90 nM. Furthermore, after binding with Hg 2+ , the R19S encapsulated hydrogel microspheres can be separated from testing samples easily and treated with the solution containing KI to remove Hg 2+ and realize reusable detection. The current work may offer a new method for Hg 2+ recognition with a more efficient manner.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2015
·
IF 6.196
Jiangru Zhang,Xiang Wang,Guicun Qi,Binghai Li,Zhihai Song,Haibin Jiang,Xiaohong Zhang,Jinliang Qiao
A novel carbon microspheres composed of N-doped hollow carbon nanospheres was prepared by a newly developed three-step method. Firstly, poly(styrene-co-butyl acrylate)/polypyrrole (PSBA/PPy) latex particles with core–shell structure were synthesized by the chemical oxidative polymerization of pyrrole in poly(styrene-co-butyl acrylate) (PSBA) emulsion, then PSBA/PPy core–shell latex was dried by spray drying process . Finally, the dried PSBA/PPy particles were pyrolyzed under nitrogen atmosphere at 500–800 °C without activation process . It was found that nitrogen content could reach 7.62 wt% and large amount of micro-, meso- and macro-pores existed in this kind of carbon microsphere. The application of this carbon microsphere in CO 2 capture was also explored.
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
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2018
·Vol. 2018
·期 9
·1080-1086
·
IF 2.507
Qianhong Shen,Zengyu You,Yang Yu,Tian Qin,Yuxuan Su,Hui Wang,Chunchun Wu,Fang Zhang,Hui Yang
Graphical A new carbon quantum dots/porous InVO 4 (CQDs/p-InVO 4 ) composite with enhanced photocatalytic activity was fabricated by loading carbon quantum dots on the surface of porous InVO 4 microspheres by a facile reflux process. A new carbon quantum dots/porous InVO 4 (CQDs/p-InVO 4 ) microsphere composite was synthesized by a facile reflux method. The relationship of structure and property of CQDs/p-InVO 4 was studied in detail. The results show that the as-prepared composite samples maintain the porous structure of the p-InVO 4 microspheres, while CQDs are uniformly loaded on the surface of the p-InVO 4 microspheres with an intimate interface. With this unique structure, the as-obtained samples exhibit enhanced photocatalytic degradation ability towards Rhodamine B (RhB) under visible-light irradiation. The synergistic effect of more active sites, increased visible-light absorption, and high separation efficiency of photogenerated electron–hole pairs is believed to be the reason for the enhanced photocatalytic activity.
研究领域:
材料科学
·
环境科学
✓ 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
Dandan Ma,Naizhen Zhou,Tianzhu Zhang,Ke Hu,Xiao’e Ma,Ning Gu
In this study, we designed a kind of photoresponsive hydrogel microsphere for three-dimensional (3D) cell culture, which is based on the host-guest interaction of β-cyclodextrin (β-CD) and Azobenzene. The hydrogel microsphere consists of polyethylene glycol (PEG) and β-CD modified poly(methyl vinyl ether-alt-maleic acid) (PMVE-alt-MA) which was allowed to assemble with azobenzene-arginine-glycine-aspartate (Azo-RGD) via host-guest interaction for controlling cell adhesion and detachment. UV irradiation led to the detachment of Azo-RGD from hydrogel microsphere, and the number of cells cultured on the hydrogel microsphere surface was reduced subsequently. This photo-switchable surface can achieve the controllability of cells adhesion and detachment.
研究领域:
生物材料学
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2016
·Vol. 141
·期 18
·5366-5373
·
IF 4.033
Jie Tang,Yingying Su,Dongyan Deng,Lichun Zhang,Na Yang,Yi Lv
Using probes based on persistent luminescence nanoparticles (PLNPs) is a promising methodology for direct imaging analysis of bio-molecules. In the present work, SrMgSi2O6:Eu0.01,Dy0.02 persistent luminescence microspheres have been synthesized via a simple template method and sunlight could successfully excite their luminescence. Further, a new probe was established based on turn-off of the persistent luminescence emission for detection and optical imaging of dopamine (DA). Mechanistic studies indicated that when the synthesized PL microspheres themselves are alkaline, the PL of the SrMgSi2O6:Eu0.01,Dy0.02 microspheres can be efficiently quenched by DA through electron transfer in the presence of ambient O2. The approach exhibited high convenience by only homogeneously mixing DA and the SrMgSi2O6:Eu0.01,Dy0.02 microspheres. Meanwhile, other phenols, ascorbic acid (AA), and uric acid (UA) were tested and had little interference to the dopamine detection. The current strategy showed the linear range of PL intensity versus concentration was 1.0 × 10−5–1.0 × 10−3 M for DA with a detection limit of 0.78 μM (S/N = 3) and it was successfully applied for imaging and detection of DA in human urine with quantitative recovery (99.6–102.5%).
研究领域:
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale Advances
·
2018
·Vol. 1
·期 1
·162-167
·
IF 0
Liping Song,Lei Zhang,Kai Xu,Youju Huang,Pan Gao,Haiyan Fang,Jiawei Zhang,Zhihong Nie,Tao Chen
Current technologies still face a big challenge to achieve simultaneous rapid qualitative and quantitative detection of trypsin. In our present study, we developed a simple and effective strategy to sensitively, qualitatively and quantitatively analyze the activity of trypsin using a fluorescent polystyrene (PS) microsphere probe. PS spheres were first functionalized by the surface coating of polyethylene glycol (PEG), which could significantly decrease the possibility of nonspecific physical adsorption of the fluorescein isothiocyanate isomer-modified peptide (peptide-FITC). Then, the obtained PS-PEG spheres were chemically interacted with peptide-FITC, which were then employed to monitor the real-time activity of trypsin. The peptide used in our work contained rich lysine and arginine residues, which were the recognition sites of trypsin. When trypsin interacted with the PS-FITC-peptide microspheres, the peptide-FITC rapidly decomposed into free small fragments in solution, resulting in a gradual decrease in the fluorescence of the PS spheres. By taking advantage of the fluorescence changes using confocal microscopy imaging and fluorescence spectrum intensity, it is easy to achieve the qualitative and quantitative detection of trypsin, with a highly sensitive detection limit as low as 0.5 ng mL−1 and high selectivity. Thus, the designed fluorescent PS microsphere probe would be very promising in various applications such as food safety inspection, personal healthcare and on-site environmental monitoring.
研究领域:
生物化学
·
分析化学
·
医学检测
✓ 已验证
产品关联
DOI
PubMed
JOURNAL OF MATERIALS RESEARCH
·
2014
·Vol. 29
·期 10
·1153-1161
·
IF 1.815
Lin Chen,Longfei Li,Weifeng Liu,Yongzhen Yang,Xuguang Liu
A novel thermosensitive core/shell microgel with carbon microspheres (CMSs) cores was prepared by three steps. First, oxidized-carbon microspheres were obtained by mixed-acid oxidization. Second, the silane agent of 3-(trimethoxysilyl)-propyl methacrylate was used to functionalize the oxidized-carbon microspheres so as to generate the vinyl groups on the microspheres. Thereafter, the as-synthesized particles were used as seeds in the precipitation polymerization of N-isopropylacrylamide to introduce a thermosensitive polymer microgel shell onto the surfaces of the silanized-CMSs in the presence of an initiator and a crosslinker. The morphology and thermosensitive properties of the composite microspheres were characterized by field emission scanning electron microscopy, transmission electron microscopy, Fourier transformation infrared spectroscopy, thermogravimetry, and dynamic light scattering. Results indicate that the thickness of polymer layer could be adjusted by the crosslinking agent's concentration. The composite microgels had a low critical solution temperature at about 30 °C and exhibited strong thermosensitivity. The controlled release of a drug molecule (a model drug, acetosalicylic acid) was also investigated.
研究领域:
材料科学
·
生物医药
✓ 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）