Materials
·
2018
·Vol. 11
·期 11
·2232
·
IF 2.467
Jiahui Wang,Hao Zhang,Ruifang Guan
Dual-emission nanosensor for Hg2+detection was prepared by coupling CA-AEAPMS on the surface of RBS-doped modified silica microspheres. The CA-AEAPMS was synthesized by usingN-(β-aminoethyl)-γ-aminopropyl methyldimethoxysilane (AEAPMS) and citric acid as the main raw material. The obtained nanosensor showed characteristic fluorescence emissions of Rhodamine B (red) and CA-AEAPMS (blue) under a single excitation wavelength (360 nm). Upon binding to Hg2+, only the fluorescence of CA-AEAPMS was quenched, resulting in the ratiometric fluorescence response of the dual-emission silica microspheres. This ratiometric nanosensor exhibited good selectivity to Hg2+over other metal ions, because of the amide groups on the surface of CA-AEAPMS serving as the Hg2+recognition sites. The ratio of F450/F580linearly decreased with the increasing of Hg2+concentration in the range of 0 to 3 × 10−6M, and a detection limit was as low as 97 nM was achieved. Then, the addition of three thiol-containing amino acids (Cys, Hcy, GSH) to the quenched fluorescence solution with Hg2+can restore the fluorescence, and the detection limits of the three biothiols (Cys, Hcy, GSH) are 0.133 μM, 0.086 μM, and 0.123 μM, respectively.Keywords:dual-emission;silica microspheres;fluorescence
研究领域:
分析化学
·
环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
DYES AND PIGMENTS
·
2024
·
IF 4.1
XiaoHua Cheng,Shuai Peng,Zhengfei Tan,Yahui Zhou,Huiyu Yang,Bo Deng
Structural color is an important way to achieve the ecological coloring of textiles. SiO 2 microspheres with sizes in the range of 200–337 nm were synthesized by the Stober method and then covered with highly light-absorbing melanin PDA to form SiO 2 @PDA photonic crystals. The SiO 2 @PDA photonic crystals were assembled onto the surface of white cotton fabrics by gravity deposition to achieve structural color. The addition of polyvinylpyrrolidone (PVP) enhances interfacial bonding by forming multiple hydrogen bonds between its lactam group and the phenolic hydroxyl group of PDA, resulting in a structured color cotton fabric with high color fastness. Scanning electron microscopy (SEM) was used to study the structure and morphology of SiO 2 @PDA microspheres. The chemical compositions of PDA and PVP were surveyed by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The surface structural color of cotton fabrics was investigated by UV–Vis reflectance spectroscopy.
研究领域:
材料科学
·
纺织工程
·
生态学
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2014
·
IF 0.371
Xue Lei,Bing Yu,Hai-Lin Cong,Chao Tian,Yue-Zhong Wang,Qian-Bin Wang,Chuan-Kuo Liu
Monodisperse silica microspheres have drawn much attention for having important applications in many areas. In this paper, a series of monodisperse silica (SiO2) microspheres was synthesized successfully using a modified Stöber method in which tetraethyl orthosilicate (TEOS) was continuously supplied into the reaction system by a syringe pump. By changing the supply rate of TEOS, the diameters of the obtained SiO2 microspheres were controlled very well from 1 μm to 3 μm. Detailed characterization of the silica particles was performed using scanning electron microscopy (SEM).
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
SENSORS
·
2022
·Vol. 22
·期 12
·4595
·
IF 3.847
Haiyang Sha,Zhengkun Wang,Jie Zhang
In this paper, a monolayer SiO2microsphere (MS) array was self-assembled on a silicon substrate, and monolayer dense silver nanoparticles (AgNPs) with different particle sizes were transferred onto the single-layer SiO2MS array using a liquid–liquid interface method. A double monolayer “Ag@SiO2” with high sensitivity and high uniformity was prepared as a surface-enhanced Raman scattering (SERS) substrate. The electromagnetic distribution on the Ag@SiO2substrate was analyzed using the Lumerical FDTD (finite difference time domain) Solutions software and the corresponding theoretical enhancement factors were calculated. The experimental results show that a Ag@SiO2sample with a AgNPs diameter of 30 nm has the maximal electric field value at the AgNPs gap. The limit of detection (LOD) is 10−16mol/L for Rhodamine 6G (R6G) analytes and the analytical enhancement factor (AEF) can reach ~2.3 × 1013. Our sample also shows high uniformity, with the calculated relative standard deviation (RSD) of ~5.78%.Keywords:Raman scattering;SiO2microsphere array;Ag nanoparticles
研究领域:
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Site Luo,Yangjie Li,Wei Yang,Wenjing Gao,Haihu Yu,Niu Huang
A simple yet powerful approach to obtain structural color is the amorphous assembly of colloidal spheres, which is also referred to as the amorphous photonic structure or photonic glasses (PGs). Additionally, the functionalization of the colloidal spheres as building blocks can further endow the resulting PGs with multifunctions. Herein, we have developed a facile strategy to prepare SiO2 colloidal spheres with concentrically embedded carbon dots (CDs). Notably, the CDs are prepared and silane-functionalized simultaneously, which enables the perfect incorporation of CDs into the Si–O network during the Stöber reaction and thus leads to the formation of a concentric SiO2/CD interlayer within the obtained SiO2 spheres. Moreover, the obtained SiO2/CD spheres can be applied as photonic pigments by assembling them into PGs, which exhibit structural color under daylight and fluorescence under UV illumination. With incorporation of carbon black, the structural color saturation and fluorescence intensity can be further manipulated. Owing to the combination of structural colored PGs and fluorescent CDs, our study can offer inspiration for color- and fluorescence-related applications such as sensing, in vivo imaging, LEDs, and anticounterfeiting.
研究领域:
材料科学
·
光学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Chemical Engineering Journal Advances
·
2021
·
IF 0
Bing Li,Qiang Xue,Yong Wan,Lin Liu,Junhua Fu,Yitao Yu,Feng Wang,Jinhui Li,Fangzhi Zhang,Shuo Zhang,Zhenhua Wang,Ning Zhao
Water deterioration and eutrophication caused by phosphorus (P) contamination necessitates P removal from polluted water, and has been a research focus since the second half of last century. In this study, novel mesoporous micropheres based on silicon and calcium (Ca) was prepared as an adsorbent by direct pyrolysis to enrich and remove P. The maximum adsorption capacities of the prepared adsorbents were 356.34 and 496.73 mg g −1 P−PO 4 3− for potassium phosphate (K 3 PO 4 ) and potassium dihydrogen phosphate (KH 2 PO 4 ) solutions, respectively, and adsorption equilibrium was attained rapidly in less than 30 min. The Langmuir isotherm and pseudo-second-order kinetic model adequately fit the adsorption process for K 3 PO 4 solution, while the Langmuir isotherm and pseudo-first-order kinetic appropriately fit the KH 2 PO 4 solution. The adsorption of P was due to the reaction between Ca 2+ and PO 4 3− , forming different phosphates. Addition of interfering ions had no significant effect on the adsorption ability of the prepared adsorbents. The proposed adsorbent was successfully applied to remove P from real wastewater. Notably, this new Ca-modified mesoporous silicon micropheres is an excellent adsorbent for treating wastewater containing low P content, providing an effective approach for facile preparation of P adsorbents and exhibiting promising P removal from wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
ACS Agricultural Science & Technology
·
2024
·
IF 2.3
Leiyu Yang,Yifan Luo,Yapeng Chen,Sanyan Wang,Huashan Wang,Meiyi Wang
Fomesafen serves as a widely employed selective herbicide for addressing broadleaf weeds, but the short duration of efficacy limits utilization efficiency. There exists an exigent requirement to extend its efficacy through controlled release mechanisms. Fomesafen@SiO2-starch microspheres with α-amylase responsiveness were synthesized through the direct binding of drug-loaded silica microspheres and modified starch. This fabrication method capitalizes on the enzymatic degradation potential of the outer starch layer by amylase. In contrast with earlier analogous structures that exhibited inferior drug loading efficacy, the prepared fomesafen@SiO2-starch microspheres demonstrated a significantly enhanced drug loading capacity of up to 35.7%. Furthermore, in comparison to fomesafen technical, the prepared fomesafen@SiO2-starch microspheres exhibited a notable capacity to mitigate the photolysis of fomesafen through the utilization of the starch outer layer. Additionally, the fomesafen@SiO2-starch microspheres demonstrated favorable wettability and adhesive properties. At the recommended dosage, the herbicidal efficacy of fomesafen@SiO2-starch microspheres against Brassica napus L. and Portulaca oleracea L. over 14 days was observed to be comparable to that of the fomesafen technical, concurrently exhibiting a degree of sustained release. These findings underscore the potential of microspheres in regulating the release of fomesafen, thereby presenting a promising avenue for the development of sustainable drug delivery systems in agriculture.
研究领域:
农业科学
·
材料科学
·
植物保护学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2011
·
IF 3.723
Xinhong Qiu,Zhanqiang Fang,Bin Liang,Fenglong Gu,Zhencheng Xu
The agglomeration of nanoparticles reduces the surface area and reactivity of nano zero-valent iron (NZVI). In this paper, highly dispersive and reactive NZVI immobilized in mesoporous silica microspheres covered with FeOOH was synthesized to form reactive mesoporous silica microspheres (SiO 2 @FeOOH@Fe). The characteristics of SiO 2 @FeOOH@Fe were analyzed by transmission electron microscopy, Fourier transform infrared spectroscopy simultaneous thermal analysis, X-ray photoelectron spectroscopy, and Brunnaer–Emmett–Teller surface area analysis. The mean particle size of the reactive mesoporous silica microspheres was 450 nm, and its specific surface area was 383.477 m 2 g −1 . The degradation of dcabromodiphenyl ether (BDE209) was followed pseudo-first-order kinetics, and the observed reaction rate constant could be improved by increasing the SiO 2 @FeOOH@Fe dosage and by decreasing the initial BDE209 concentration. The stability and longevity of the immobilized Fe nanoparticles were evaluated by repeatedly renewing the BDE209 solution in the reactor. The stable degradation of BDE209 by SiO 2 @FeOOH@Fe was observed within 10 cycles. Agglomeration-resistance and magnetic separation of SiO 2 @FeOOH@Fe were also performed. The improved dispersion of SiO 2 @FeOOH@Fe in solution after one-month storage and its good performance in magnetic separation indicated that SiO 2 @FeOOH@Fe has the potential to be efficiently applied to environmental remediation.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2018
·Vol. 10
·期 1
·59
·
IF 2.935
Wenqiang Wang,Xi Chen,Chu Zhao,Bowu Zhao,Hualin Dong,Shengkui Ma,Liying Li,Li Chen,Bin Zhang
A blend of Polyvinylidene Fluoride (PVDF) and SiO2microspheres inN,N-Dimethylformamide (DMF) underwent phase inversion to form a PVDF/SiO2membrane with SiO2microspheres in the membrane’s pores. Subsequently, the SiO2microspheres have been used as platforms for in site Ag nanoparticles (NPs) synthesis, forming a composite membrane. Benefitting from the full exposure of Ag NPs to the reactants, the composite membrane shows high catalytic reactivity when catalyzing the reduction ofp-nitrophenol under a cross-flow. The catalytic reaction follows the first-order kinetics, and the reaction rate increases with an increase in the amount of Ag NPs in the membrane, the reaction temperature, and the operating pressure. What is more, highly purified products can be produced and separated from the reactants in a timely manner by using the composite membrane.Keywords:Ag nanoparticles;catalysis;composite membrane;separation;SiO2microspheres
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL AND QUANTUM ELECTRONICS
·
2021
·Vol. 53
·期 10
·1-8
·
IF 2.084
Li Chunfang,Zhang Hongyan,Xue Qihao,Li Dongxiang
Azobenzene compounds have been widely used in many fields and through their response to light they can be used to regulate the properties of ordered structures. In this paper, sub-micrometer colloidal SiO 2 spheres were prepared and azobenzene groups were grafted on the surface of SiO 2 microspheres. The SiO 2 microspheres grafted with azobenzene groups could self-assemble to form photosensitive photonic crystals, whose photonic bandgaps red-shifted as irradiated by UV light due to the structure change of the azobenzene groups.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2020
·
IF 3.557
Xiaoran Wu,Xiang Xue,Jinghang Wang,Hewen Liu
Phoretic swarming and collective transport of colloidal particles in response to environmental stimuli have attracted tremendous interest in a variety of fields. In this work, we investigate the light-actuated motion, aggregation, and light-guided long-distance mass transport of silica microspheres in simple spiropyran solutions under the illumination of UV spot sources. The phototactic motion is confirmed by the dependence of swarming on the illumination intensity and spiropyran concentrations, ON–OFF switching tests, pattern-masked UV sources, etc. The aggregates formed via swarming of silica spheres can chase after a moving UV source, however, relying on a critical speed of the UV source. Only when the UV source speed is below the critical value, the aggregates follow the UV spot at a constant relative speed to the light spot. Analysis on the shape of silica microsphere currents indicates that continuous illumination of the UV spot source and resultant chemical gradients are important for the formation of steady microsphere currents. Light-guided aggregation and long-distance mass transport are interesting for targeted delivery and remote-controlled enrichment of environmental hazards.
研究领域:
材料科学
·
物理学
·
化学
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Hongbo Li,Yanli Li,Mengya Li,Lingqiu Xu,Jing Li
Formaldehyde is a highly reactive and toxic compound in air pollutants, exposure to even a low concentration of formaldehyde will do harm to human health. Herein, a novel electrochemical impedance sensor for formaldehyde has been developed based on Ag + -SiO 2 microspheres prepared by the exchange of silver ions with trapped ammonium ions. The probe of silver ion is easily and selectively reduced by formaldehyde, then the silver nanoparticles would be generated. Exposure to more concentration of formaldehyde, more proportionate silver nanoparticles would be loaded on the surface of silica microspheres, and then the decrement of interface charge transfer resistance (R ct ) would be obtained accordingly. The decrement of R ct was linear with the concentration of formaldehyde in the range from 2 to 6000 pmol L −1 with a detection limit of 0.5 pmol L −1 . Enabled by such a unique sensing mechanism, the fabricated sensor has been successfully applied for the detection of formaldehyde in real samples with high performance in selectivity, low power consumption, sensitivity, cost-effectiveness, facility, and portability.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）