Analytical Methods
·
2013
·Vol. 5
·期 13
·3272-3277
·
IF 1.855
Xiaomin Qian,Chenchen Xiao,Qianli Zhang,Yifeng Tu
A bare fused silica capillary lacks enough efficiency for electrophoretic separation under some circumstances as a complex mixture of analogous compounds or stroma matrix. To improve the separation, a strategy of functionalization for the inner surface with nano-silica and polyelectrolytes is proposed in this paper. The results have demonstrated that the hybrid coating film of poly(diallyldimethylammonium chloride) (PDDA)–nano-SiO2–poly(styrenesulfonate) (PSS) on a silica capillary greatly promoted the separation efficiency. As a model, four analytes (naringenin, rutin, quercetin and ascorbic acid) are well separated with 24 mmol L−1 borate buffer solution (pH 8.3) as the carrier. The proposed approach was successfully applied for rapid determination of these analytes in artificial urine with satisfactory results.
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FERROELECTRICS
·
2020
·
IF 0.669
Qi Tang,Ting Yang,Song Wang,Hai-Lin Cong,Xin-Rui Yang,You-Qing Shen,Bing Yu
Magnetic composites have been widely used in the area of wastewater treatment, which own the properties of simple and quick adsorption and separation functions. This article presented a cost-effective and chemically modified adsorbent (Fe3O4@SiO2@Chitosan) based on a novel facile light-assisted technique for methyl orange (MO) removal. The characterization results of FT-IR, TEM, XRD and the hysteresis loop showed that Fe3O4@SiO2@Chitosan was successfully prepared. The adsorption properties of the magnetic Fe3O4@SiO2@Chitosan composite had been discussed in detail. Results show that the magnetic composite was able to remove more than 99.15% of dyes in water under optimized conditions. The Fe3O4@SiO2@Chitosan composite was stable and easily recovered, which demonstrated that the Fe3O4@SiO2@Chitosan can be successfully used as a reusable absorbent for effective removal of methyl orange from wastewater.
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 14
·5324-5332
·
IF 3.288
Jinfei Liu,Huijiao Qiu,Fei Zhang,Yan Li
In this study, a new magnetic composite material zeolitic imidazolate framework-8 coated Fe3O4@SiO2 (Fe3O4@SiO2/ZIF-8) was prepared by in situ growth of ZIF-8 on the surface of Fe3O4@SiO2 microspheres at room temperature. In addition, it had a large surface area, high superparamagnetism and great adsorption capacity. As is well known, MOFs have extraordinary adsorption capacity. As one of the classic MOFs, ZIF-8 has open metal sites, hydrophobic properties, and especially excellent water stability. Fe3O4 is generally used for the synthesis of different magnetic materials, which can make the preconcentrated material easy to separate from the extraction medium. All these features make the composite material Fe3O4@SiO2/ZIF-8 suitable to be developed as an adsorbent for preconcentration of bisphenols (BPs) including bisphenol F, bisphenol A, bisphenol B and bisphenol AP. Most of all, applying Fe3O4@SiO2/ZIF-8 to magnetic solid-phase extraction (MSPE) coupled with high performance liquid chromatography (HPLC) for detection of BPs can greatly improve the sensitivity of the method, and the process is simple and convenient. Under the optimal conditions, four BPs were detected with large linear ranges (0.05–200 μg L−1), low limits of detection (LODs) (10–15 ng L−1), relative standard deviations (RSDs) ranging from 2.0 to 4.5% and enrichment factors (EFs) ranging from 110 to 186. Additionally, the proposed method was applied to detect BPs in water and plastic packagings of food and drinks generally used in daily life.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Mingliang Ma,Wenting Li,Zhouyu Tong,Yong Ma,Yuxin Bi,Zijian Liao,Jian Zhou,Guanglei Wu,Mingxia Li,Jiewei Yue,Xinyu Song,Xinyue Zhang
One-dimensional (1D) ZnFe 2 O 4 @SiO 2 (ZS) nanochains were prepared with Stöber method under external magnetic field. Then, 1D ZS nanochains were covered with a uniform polydopamine (PDA) shell, and the pyrolysis process was completed to obtain 1D ZnFe 2 O 4 @SiO 2 @C (ZSC) nanochains. Finally, 1D flower-like ZnFe 2 O 4 @SiO 2 @C@NiCo 2 O 4 (ZSCNC) nanochains were fabricated through a simple hydrothermal method. The carbon layer with strong dielectric loss enabled the 1D ZSC nanochains to achieve an ultra-wide effective absorption bandwidth (EAB) of 6.22 GHz. Compared with the above nanochains, the 1D ZSCNC nanochains showed more excellent microwave absorption (MA) properties because of the unique 1D flower-like architectures having large surfaces and multiple interfaces. The sample loaded with 30 wt% 1D flower-like ZSCNC nanochains showed strong MA performances with a minimum reflection loss (RL) value of −54.29 dB (11.14 GHz) and an EAB of 5.66 GHz (11.94–17.60 GHz) at the thickness of 2.39 mm. The 1D flower-like ZSCNC nanochains with strong absorption, broad absorption bandwidth (almost the entire Ku band) and thin layer has a good application prospect for the absorption of electromagnetic waves in Ku band.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 15
·20104-20114
·
IF 2.478
Sun Junchen,Fang Min,Zhu Weiju,Wu Zhenyu,Li Cun
SiO 2 @TiO 2 -Ag (STA) microspheres decorated with Ag nanoparticles (Ag NPs) were prepared and assembled into the photoanode. The photoanode composed of STA microspheres and TiO 2 nanoparticles (P25) was prepared by doctor blade method. UV–vis measurement indicates that the introduction of a few STA microspheres observably enhances the light scattering and capturing ability of the photoanode. The photoelectric conversion efficiency of the DSSCs with 2wt% STA photoanode increased to 7.4% from 4.3% comparing with pure P25 TiO 2 nanoparticles. The configuration DSSCs have the maximum short circuit current density ( J sc ) of 16.0 mA cm −2 and open-circuit voltage ( V oc ) of 0.780 V, which are significantly higher than the pure TiO 2 DSSCs. The significant improvement of the DSSCs performance can be due to the synergistic effect of the superior light scattering of STA and the localized surface plasma resonance (LSPR) effect of Ag NPs modified on the microspheres surface.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2021
·
IF 5.097
Minkang Li,Lina Zhang,Zhongzheng Zhang,Jialin Shi,Yuefeng Liu,Jiansong Chen,Nannan Sun,Wei Wei
Integration of adequate activity, stability, and productivity in a catalyst is of strategical importance to achieve high performance, particularly for inactive reactants, e.g., CO2. Here, using a reversed microemulsion method, ultrafine metallic Ag nanoparticles coated with porous SiO2 can be facilely obtained using micelles as separated nanoreactors for the preparation. Such architectures allowed the rigid SiO2 matrices to act as physical spacers, so that aggregation of the Ag particles could be avoided. Meanwhile, due to the templating effect from the surfactant, large mesopores could be induced in the SiO2 shell, and thus the diffusion barrier of reactants could be minimized. When used as a heterogeneous catalyst for carboxylation of terminal alkynes by CO2 under mild conditions, the prepared xAg@SiO2 catalysts showed extraordinary performance in terms of excellent activity, stability, productivity, and wide substrate scope. The knowledge developed here may also enrich the toolbox for performance promotion of metal catalysts via specially fabricated structures.
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 7
·1-14
·
IF 5.833
Shi Zhaoxia,Xia Ling,Li Gongke,Hu Yufei
Based on platinum nanoparticle–embedded raspberry-liked SiO 2 , a sensitive and selective electrochemical sensor was developed for simultaneous determination of eugenol (EU) and methyleugenol (MEU). Raspberry-liked SiO 2 (RL-SiO 2 ) was characterized with open pores on the surface, which can be used as a path for utilizing the inner space fully. So, platinum nanoparticles (Pt NPs) could be embedded in the inner and outer surface of RL-SiO 2 . As a carrier, RL-SiO 2 not only avoided the agglomeration of the Pt NPs but also improved the catalytic performance. Therefore, the prepared Pt NPs@RL-SiO 2 /GCE exhibited excellent electrocatalytic activity for simultaneous determination of EU and MEU; the linearity ranges were 0.50 ~ 60 μmol/L for EU at a working potential of 0.65 V (vs. saturated calomel electrode) and 0.50 ~ 50 μmol/L for MEU at a working potential of 1.10 V; the detection limits were 0.12 μmol/L and 0.16 μmol/L ( S/N =3); and the relative standard deviations (RSDs) were 3.2% and 4.5%, respectively. In addition, Pt NPs@RL-SiO 2 /GCE was successfully applied to the analysis of fish samples; the obtained recoveries were between 92.0 and 107%. Notably, the results conducted on samples were highly consistent with those obtained from high-performance liquid chromatography. It can be concluded that the study provided a simple method for simultaneous electrochemical determination of EU and MEU in fish samples. Graphical abstract
Schematic illustration of the preparation of RL-SiO2@Pt NPs/GCE for simultaneous determination of eugenol and methyleugenol in fish samples.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTIK
·
2021
·
IF 2.443
Beiping Dong,Yanan Gao,Juncheng Liu
High transmittance and strong dust-removing film has a broad potential application prospect in architectural glass, solar photovoltaic glass, automotive glass, etc. In this paper, SnO 2 is used as the antistatic agent, and SiO 2 as the matrix. The effects of Sn/Si molar ratio on the structure and properties of the SnO 2 -SiO 2 film prepared on quartz glass substrate with sol-gel dipping were studied. The film was analyzed by X-ray diffractometer (XRD), Fourier transform infrared (FTIR) spectroscopy and Scanning electron microscopy (SEM). Ultraviolet-Visible-Near Infrared Spectrometer (UV–VIS–NIR) and Hall effect instrument tested the photoelectric properties. Falling dust experiment was used to determine the film’s dust-removing property. The results show that the SnO 2 -SiO 2 film is composed of nano particles of SnO 2 tetragonal rutile phase and amorphous SiO 2 , and has antistatic dust-removing property. With the increase of Sn/Si molar ratio, the crystallization quality and average grain size of the film increases, while the square resistance decreases continuously. The visible transmittance fluctuates with an amplitude of no more than 1.2%, and obtained the minimum value 87.246% at Sn/Si molar ratio of 2:1. Moreover, the film’s dust-removing performance improves continuously, which obtained the best, 50%, at Sn/Si molar ratio of 2:1.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
·
2021
·
IF 10.588
Nannan Zhang,Daoping Xiang
Solar cells based on crystalline silicon wafers have dominated the global photovoltaic market for many years. Unfortunately, a large amount of photovoltaic silicon waste (PSW) also was produced during the process of cutting silicon ingot into silicon wafer. The improperly discarded PSW will bring about serious environmental hazardous problems, so it is highly necessary to safely and effectively recover and utilize PSW. Here, we report self-assembled 3D Si 3 N 4 @SiO 2 nanofibre sponges utilising PSW as silicon sources for the first time. This kind of ceramic sponge displays excellent compression resilience under a maximum strain of 67% due to the flexibility of the Si 3 N 4 @SiO 2 nanofibres. The Si 3 N 4 @SiO 2 nanofibre sponges can withstand high temperatures beyond 1200 °C with negligible weight loss and demonstrates favourable thermal insulation properties. Furthermore, the porous Si 3 N 4 @SiO 2 nanofibre sponges possess ultra-low dielectric properties , with the minimum dielectric constant and dielectric loss approaching 1 and 0, respectively. In short, a simple and low-cost technology using industrial waste to fabricate versatile Si 3 N 4 @SiO 2 nanofibre sponges with prominent performance is of great significance for the development and application of 3D ceramic architectures in various industry fields including aerospace, electronic devices and thermal insulation.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2021
·
IF 3.531
Leibo Deng,Zhe Fu,Zhang Mingxing,Hao Li,Bin Yao,Jianli He,Hua Chen,Yonghong Ma
TiO 2 –ZrO 2 -codoped MgO–B 2 O 3 –Al 2 O 3 –SiO 2 glass-ceramics were prepared using the traditional melting method. The effects of replacing TiO 2 with ZrO 2 on the glass stability (GS), crystallization behavior, structures, and properties of the obtained samples were studied. Results showed that the addition of ZrO 2 increased the GS, which decreased the crystallization ability of the samples. When the heat treatment temperature was increased from 900 °C to 1000 °C, the mullite and quartz phases first precipitated in the glass matrix, and then converted into cordierite. Because of the low solubility of TiO 2 and ZrO 2 in this glass system, the rutile and zircon phases will precipitate from the parent glasses. Owing to changes in the composition and structure of the samples, the density and Vickers hardness increased, while the coefficient of thermal expansion of the samples first decreased and then increased when TiO 2 was replaced with ZrO 2 .
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Luxia Yin,Jiacheng Xu,Bo Zhang,Leigang Wang,Wanyi Tao,Xiao Teng,Wensheng Ning,Zekai Zhang
A simple, low energy consumption and environment-friendly strategy was used to prepare highly dispersed CeO 2 /SiO 2 aerogel composites with different molar ratio of Si/Ce via sol-gel method and subsequently drying under the ambient pressure, in which the oxidation of Ce 3+ species into Ce 4+ species could be achieved by adding H 2 O 2 . The structural and surface properties of adsorbents were analyzed by XPS, XRD, FT-IR, Py-IR, SEM, XRF and N 2 adsorption-desorption isotherm. The adsorption desulfurization performances of CeO 2 /SiO 2 for thiophenic compounds from simulated gasoline and model aromatic products were investigated and compared by the breakthrough and batch adsorption experiments. As a result, the weak Lewis acid centers appeared on the surface of CeO 2 /SiO 2 . Among them, CeO 2 /SiO 2 with a Si/Ce of 25 performed best, the adsd by Duanpacity for TP from simulated gasoline (n-heptane) was 10.9 mg-S/g ads , followed by model aromatic products (benzene, 10.6 mg-S/g ads ; p-xylene, 10.1 mg-S/g ads ), however, the difference between them was slight, attributed to the formation of S-Ce bonding instead of C-Ce bonding. The very weak competitive adsorption of benzene and p-xylene with thiophene originated from the weak Lewis acid-base interaction. After the fourth solvent washing regeneration, the breakthrough adsorption capacity of regenerated CeO 2 /SiO 2 -25 still remained 60% of the fresh one. The equilibrium adsorption data of CeO 2 /SiO 2 -25 for thiophene were well fitted by Langmuir and Freundlich model, and the adsorption for TP was more favorable at the higher temperature. The adsorption process of CeO 2 /SiO 2 -25 was well fitted by pseudo-second-order kinetic model, which was spontaneous, endothermic and the freedom degree increased. The solvent (n-heptane, benzene, p-xylene) hardly influence the adsorption behavior of TP on CeO 2 /SiO 2 .
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Junge Chen,Yang Yu,Aihu Feng,Le Mi,Huixin Xiu,Yun Yu
Thermal control coatings (TCCs) are an essential part of the thermal control systems in the spacecraft. Solar absorptance and emittance are the key performance parameters of TCCs. To develop an ultra-low solar absorption and stable inorganic TCCs for surface radiator, different TCCs were prepared by co-sintering ZnO and SiO 2 nanoparticles to form Zn 2 SiO 4 /SiO 2 pigment in this work, and the optical properties and radiation stability were systematically studied. It is found that the coating based on composite pigment has high reflectivity in the ultraviolet band and excellent optical performance possessing the low solar absorption of 0.06. In addition, the Zn 2 SiO 4 /SiO 2 coating demonstrates the highest proton and electron radiation stability because that SiO 2 between Zn 2 SiO 4 particles acts as the relaxation center of the defects caused by radiation.
✓ 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）