CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Chenguang Qian,Xiangwei Zhang,Qi Tan,Yi Wen,Zhicheng Wang,Fang Yuan,Chunquan Li,Zhiming Sun
Developing small-size and high-distribution CoFe 2 O 4 nanoparticles with abundant accessible active sites is exceedingly vital for optimizing the activation efficiency of peroxymonosulfate (PMS). Herein, silica hollow (H-SiO 2 ) microspheres were employed as the carrier of CoFe 2 O 4 for decreasing its particle size and then boosting PMS activation. The introduction of H-SiO 2 microspheres alleviated the agglomeration effect of CoFe 2 O 4 , with CoFe 2 O 4 uniformly anchored on the surface of H-SiO 2 . The optimized 50-CHF exhibited excellent bisphenol A (BPA) degradation performance under the PMS system, wherein 98.9 % BPA was removed within 20 min. Given the increase of active sites and the robust active species production, BPA was more easily assembled and degraded on the surface of 50-CHF. Furthermore, quenching experiments indicated that SO 4 ∙ - and 1 O 2 were the main active species for BPA degradation. This work provides new avenues for the application of H-SiO 2 microspheres and the development and application of cobalt ferrate composite catalysts.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 6
·期 3
·1870-1876
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IF 3.84
Xiaonan Wei,Cuijiao Zhao,Jiajun Ma,Yawen Huang,Ke Cao,Guanjun Chang,Junxiao Yang
One effective route to reduce the dielectric constant is to directly incorporate hollow silica (HoSiO2) microspheres into a polymeric matrix. However, the incompatibility between silica and hydrophobic polymers possibly results in interfacial defects and polarization, and thus a high dielectric loss. In this study, the HoSiO2 microspheres were coated by polystyrene using a surface-initiated ATRP method in order to enhance interfacial property. TGA results indicated that the weight percentage of polystyrene in resulting microspheres (HoSiO2@SI-PS) reached around 33 wt%. OM images showed that the thickness of the polystyrene layer reached around 2 μm. HoSiO2@SI-PS microspheres with a weight percentage of 25% were incorporated into polyethylene (PE) to prepare the composites. The dielectric measurement results indicated that the dielectric constant of the composites was reduced to 2.05, while maintaining low dielectric loss at the level of 10−4. In comparison, when HoSiO2@C-PS microspheres, which were prepared by conventional vinyl-initiated free radical polymerization, were incorporated into polyethylene, the dielectric loss was greatly elevated to 0.007. SEM images and water absorption experiments further revealed that the low dielectric loss of PE/HoSiO2@SI-PS was related to the dense interfacial structure, strong interfacial interaction and low water absorption ability.
研究领域:
材料科学
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高分子化学
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介电材料研究
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 20
·4101-4107
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IF 1.915
Yujuan Cao,Wei Wu,Jiongling Wei,Song Wang,Xiaogang Hu,Ying Yu
We developed a hybrid fluorescent material using amino functional mesoporous hollow silica microspheres (MHSM) encapsulated with CdTe quantum dots (QDs). The amino group plays a key role in immobilizing both QDs and formaldehyde in the inner mesoporous hole of MHSM. The present QDs-MHSM shows good fluorescence property and excellent photostability after ultrasonic irradiation in water for several times or stewing for more than 30 days. Its fluorescence intensity is quenched rapidly in the presence of formaldehyde but not by interference with commonly organic solvents. Under the optimal experimental conditions, such as the response time and pH of the solution, a sensitive fluorescence method was developed for the analysis of formaldehyde in seafood based on fluorescence quenching of QDs-MHSM. The linear response range of formaldehyde (R2 = 0.9997) ranged from 0.2 to 15.5 mg L−1 and the detection limit (S/N = 3) was as low as 0.07 mg L−1. The recovery was 99.5% with a relative standard deviation less than 5.0%, which was consistent with that obtained by the China National Standard colorimetric method, suggesting the potential application of this sensitive and simple method in food quality monitoring or other relative fields.
研究领域:
分析化学
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食品安全
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纳米材料
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荧光传感
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食品质量监控
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Changqing Zhu,Sensen Yu,Xin Li,Jing Zhou,Jie Shen,Yanyuan Qi,Wen Chen
Hollow silica microspheres (HSM) can effectively reduce the coefficient of thermal expansion (CTE) of polytetrafluoroethylene (PTFE) while maintaining low dielectric constant (D k ) of the composites. However, the incorporation of HSM often leads to a decrease in thermal conductivity (TC). To overcome this limitation, we developed a multifunctional hybrid filler by coating nanodiamonds (ND) onto HSM surfaces (HSM@ND) via an electrostatic self-assembly process, and subsequently incorporating it into the PTFE matrix to fabricate HSM@ND/PTFE composites. Benefiting from the rough surface, HSM@ND exhibits enhanced interfacial interaction with PTFE, which significantly improves the CTE suppression efficiency of the composites. Meanwhile, the ND shell forms thermally conductive pathways, substantially increasing TC, and the encapsulated air within HSM contributes to the low D k . As a result, the composite with 30 vol% HSM@ND achieves a lower CTE of 76 ppm °C −1 , a 92.8 % increase in TC compared with HSM/PTFE composites, while maintaining a low D k of 2.01 and dielectric loss (D f ) of 0.0013. This work provides an effective strategy to design PTFE-based dielectric composites that combine low CTE, improved TC, and excellent dielectric properties.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yu Liu,Yudong Sun,Yong Qi,Wenbin Niu,Wei Ma,Suli Wu,Bingtao Tang,Shufen Zhang
The stimuli-responsive textiles, especially water-responsive textiles, have garnered attention owing to their environmental compatibility. Inspired by the hydrochromic behavior of Diphylleia grayi, water-rewritable structural color (WRSC) textiles exhibiting fast response speed and antispreading capability were fabricated by spraying hollow SiO2 (H-SiO2) microspheres and poly(trifluoroethyl methacrylate-butyl acrylate) [P(TFEMA-BA)]. The water-written textiles exhibited structural color changes in 0.6 s via an increase in the refractive index, driven by water penetrating the gaps between H-SiO2 microspheres. The structural color was restored to the initial state after the water evaporated, allowing multiple cycles of the write-erase-write mode. The hydrophobic P(TFEMA-BA) adhesive was used to construct a stable chromogenic array and endow WRSC textiles with antispreading properties, thereby improving structural stability and achieving clear writing patterns. The prepared WRSC textiles demonstrated high flexibility, structural stability, and water-rewritable properties, providing advanced bionic inspiration and valuable design ideas for rewritable materials and smart textiles.
研究领域:
材料科学
·
纺织工程
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Xiang-Hua Ling,Man-Ke Zhang,Hao-Yu Zhou,Guo-Zhi Han
Sodium alginate hydrogel has been widely used in the field of controlled-release. In this paper, in order to prevent the negative effect of fast degradation and explosive release of pure sodium alginate hydrogel in the drug delivery process, we developed a novel alginate hydrogel supported by hollow silica microsphere for drug delivery. Briefly, the drugs were fused with sodium alginate and the hollow silica microspheres followed by ion crosslinking to form a composite hydrogel microsphere with a core–shell structure (SA@SiO 2 ). The structure and morphology of the composite hydrogel were characterized by Fourier infrared spectroscopy (FT-IR), thermogravimetric analysis (TG), scanning electron microscope (SEM), transmission electron microscope (TEM) along with fluorescence microscope. On this basis, using three different types of organic compounds (rhodamine B, Indocyanine green and salicylic acid) as model molecules, the controlled-release performance of the SA@SiO 2 microspheres were investigated in detail. The research results show that the drug delivery system has broad-spectrum controlled-release performance for different types of molecules, and the controlled-release time can exceed 40 h. At the same time, the pH- responsive property of the sodium alginate hydrogel endows the delivery system with a certain targeting function. This study provides a new strategy for constructing an efficient targeted drug controlled-release system.
研究领域:
材料科学
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药剂学
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药物递送系统
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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）