JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2022
·Vol. 107
·期 1
·178-189
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IF 2.606
Li Qing,Qian Fuping,Yuan Ke,Dong Wei,Han Yunlong,Lu Jinli
In order to solve the problem of blocking the filter media when bag filters are used to deal with high-humidity dust, hydrophobic surface-modified filter media were prepared. Here we constructed a multi-layer rough structure using TiO 2 and SiO 2 , with polydimethylsiloxane (PDMS) subsequently deposited to reduce its surface energy to prepare stable and robust TiO2–SiO2@PDMS modified superhydrophobic filter media. Through modification of the filter media, its surface was changed from superhydrophilic to superhydrophobic, and the water contact angle reached 158°. For the particles with 0.3 μm, the filtration efficiency and quality factor of the modified filter media are higher than those of the unmodified filter media at a flow velocity of 0.043–0.127 m/s, which improves the filtration performance of the filter media. In addition, the modified filter media has strong durability in harsh environmental conditions (such as mechanical wear, strong acid or alkali solution), and has excellent self-cleaning performance. Therefore, such superhydrophobic filter media have great potential for the application of bag filters in various industrial production processes.
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Advanced Healthcare Materials
·
2022
·Vol. 11
·期 15
·2200499
·
IF 11.092
Mingyue Liu,Muhammad Shafiq,Binbin Sun,Jinglei Wu,Wei Wang,Mohamed EL-Newehy,Hany EL-Hamshary,Yosry Morsi,Onaza Ali,Atta ur Rehman Khan,Xiumei Mo
Repairing irregular-shaped bone defects poses enormous challenges. Scaffolds that can fully fit the defect site and simultaneously induce osteogenesis and angiogenesis hold great promise for bone defect healing. This study aimed to produce superelastic organic/inorganic composite aerogel scaffolds by blending silica nanofibers (SiO 2 ) and poly (lactic acid)/gelatin (PLA/gel) nanofibers; the content of SiO 2 nanofibers is varied from 0–60 wt% (e.g., PLA/gel, PLA/gel/SiO 2 -L, PLA/gel/SiO 2 -M, and PLA/gel/SiO 2 -H for 0%, 20%, 40%, and 60% of SiO 2 nanofibers, respectively) to produce a range of scaffolds. The PLA/gel/SiO 2 -M scaffold has excellent elasticity and good mechanical properties. In vitro experiments demonstrate that the silicon ions released from PLA/gel/SiO 2 -M scaffolds promote the differentiation of rat bone marrow-derived mesenchymal stem cells into osteoblasts, enhancing alkaline phosphatase activity and bone-related genes expressions. The released silicon ions also promote the proliferation of human umbilical vein endothelial cells and the expression of vascular endothelial growth factors, thereby promoting angiogenesis. The assessment of these scaffolds in a calvarial defect model in rats shows good potential of PLA/gel/SiO 2 -M to induce bone regeneration as well as promote osteogenesis and angiogenesis. Overall, these organic/inorganic composite scaffolds have good biological activity, which may have broad applications for tissue engineering.
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PubMed
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ACS Applied Nano Materials
·
2022
·
IF 6.14
Miao Tian,Zhu Long,Yun Wu,Dan Zhang,Pengxiang Si
Co-assembly of SiO2 nanoparticles (NPs) with polymers can fabricate photonic coatings with the advantages of one-step fabrication, large-scale production, good adhesion, and less periodic structure defects. However, it is difficult to adjust the color of photonic coatings by this method because the complex interaction between SiO2 NPs and polymers could damage the original periodic structure. In this study, we utilized soft polyurethane (PU) colloidal NPs as a matrix to blend with hard SiO2 NPs for co-assembly. After solvent evaporation, these soft PU NPs are filled between the space of SiO2 NPs and then merged together to change the effective refractive index (RI) and interplanar spacing of coatings. By delicately tuning PU mass ratio, the color of coatings changes in a large range from blue (459 nm) to yellow (512 nm) and yellow (560 nm) to red (636 nm) using 187 and 235 nm SiO2 NPs, respectively. Moreover, the 180° peeling strength increased from 48.48 to 406.06 N/m and the shear strength increased from 0.02 to 0.32 MPa, indicating the addition of PU enhanced the durability of coatings. This one-pot co-assembly strategy enables continuous color regulation and simplifies the fabrication process of color-adjustable photonic coatings, demonstrating potential applications in the areas of pigments, display, and anti-counterfeiting.
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Biomedical Materials
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2022
·Vol. 17
·期 2
·025005
·
IF 4.103
Bo Li,Hong Li,Haocheng Yang,Yue Shu,Kejiang Li,Ke Chen,Wenqian Xiao,Xiaoling Liao
Pure gelatin hydrogels lack antibacterial function and have poor mechanical properties, which restrict their application in wound dressings. In this study, nanosized silver bromide-doped mesoporous silica (AgBr@SiO2) microspheres with hollow structures were prepared by a modified Stober method. The novel microspheres can not only release silver ions to treat bacteria but also release drugs to treat skin wound. Furthermore, AgBr@SiO2 microspheres were modified with propyl methacrylate, incorporated into methacrylated gelatin (GelMA), and crosslinked by UV light to prepare AgBr@SiO2/GelMA dressings consisting of composite hydrogels. The results showed that the AgBr@SiO2 microspheres could enhance the mechanical properties of the hydrogels. With the increase in the AgBr@SiO2 concentration from 0.5 to 1 mg ml−1, the dressings demonstrated effective antimicrobial activity against both Staphylococcus aureus and Escherichia coli. Furthermore, full-thickness skin wounds in vivo wound healing studies with Sprague–Dawley rats were evaluated. When treated with AgBr@SiO2/GelMA containing 1 mg ml−1 AgBr@SiO2, only 15% of the wound area left on day 10. Histology results also showed the epidermal and dermal layers were better organized. These results suggest that AgBr@SiO2/GelMA-based dressing materials could be promising candidates for wound dressings.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2021
·
IF 5.455
Sisi Su,Lanlan Lin,Haiyang Li,Xinyu Wen,Rui Yan,Caihong Tao
Photothermal material was one of the hot topics in nanomedicine in recent years, which had aroused widespread attention of scholars. In this paper, a kind of core-shell drug nanocarriers with good photothermal properties were prepared, and its photothermal therapeutic effect on tumor cells in vitro was studied. First, fluorescein isothiocyanate (FITC) was encapsulated in silica nanoparticles to form silica fluorescent (F-SiO 2 ) nanoparticles. Then mesoporous dopamine (MPDA) layer were built on the F-SiO 2 nanoparticles, the core-shell nanoparticles (F-SiO 2 @MPDA) with mesoporous shell structure were obtained. Finally, Au nanoparticles (AuNPs) were wrapped on the surface of the layer of MPDA shell by the citrate reduction method, and the F-SiO 2 @MPDA-AuNPs composite nanoparticles were formed. Then, the fluorescence property, adsorption performance, sustained release property, photothermal property and cytotoxicity of the F-SiO 2 @MPDA-AuNPs nanoparticles were researched. It was found that F-SiO 2 @MPDA-AuNPs nanoparticles had good fluorescence performance, high adsorption capacity (DOX, 111.275 mg/g) and pH responsive release performance. When pH = 5.2, the DOX release rate was 39.5% within 7 h under the action of near-infrared light (NIR). In addition, it also had a high photothermal conversion rate (36.95%), and the DOX loaded F-SiO 2 @MPDA-AuNPs nanoparticles had obvious inhibitory effect on tumor cells in vitro. As a kind of mesoporous drug nanocarriers with photothermal properties, it has potential application value.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-8
·
IF 5.479
Xia Hongjun,Wang Jun,Chen Gang,Liu Jiawei,Wan Guangpin,Bai Quan
Monodisperse SiO 2 @SiO 2 core-shell silica microspheres (CSSM) with enlarged mesopores perpendicular to the particles surface were prepared using a dual-templating approach. With cetyltrimethyl ammonium bromide as the template and octyltrimethyl ammonium bromide as an auxiliary chemical, the pore size can be enlarged from 2.6 to 10.6 nm. The average shell thickness can be increased from 31 nm to 97 nm by adjusting the concentrations of the surfactants under continuous addition of tetraethyl orthosilicate. After coating twice, the resulting CSSM has a uniform mesoporous shell of about 198 nm thickness and a narrow pore size distribution. The CSSM were then modified with octadecyltrichlorosilane to give a material referred to as CS-C18. It was evaluated by separating the mixture of methylbenzene (toluene), ethylbenzene, n-propylbenzene, n-butylbenzene, n-amylbenzene and hexylbenzene. The baseline separation of the six alkyl benzenes is achieved within 2 min. Compared to a commercial column of type BEH-C18, CS-C18 shows a faster and better separation even at lower back pressure. It was also applied to the fast separation of benzo[a]pyrene, salbutamol, ractopamine and clenbuterolin residues in pork samples. The high column efficiency and better reproducibility suggest that the CSSM can be used as a matrix for fast separation and analysis of several kinds of small analytes.
A dual-templating approach was utilized to produce the core shell microsphere with controllable mesopore channels by using hexadecyltrimethylammonium bromide (CTAB) as the template and trioctylmethylammonium bromide (TOMAB) as an auxiliary chemical to enlarge the size of CTAB micelles.
研究领域:
材料科学
·
分析化学
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GREEN CHEMISTRY
·
2024
·Vol. 26
·期 11
·6748-6759
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IF 9.3
Yitian Zhang,Jie Gao,Chao Jiang,Gang Luo,Jiajun Fan,James H. Clark,Shicheng Zhang
Chemical upgrading as a recycling technology for poly(ethylene terephthalate) (PET) waste plastic is an effective way to help solve the current challenges of plastic pollution. Catalytic methanolysis technology enables the depolymerization of PET into high-value dimethyl terephthalate (DMT) monomers under relatively mild conditions, thereby achieving closed-loop recycling of PET waste plastic. In this study, we compared the catalytic efficiency of Cu/SiO2 catalysts prepared by three different methods for the depolymerization of PET to DMT. Cu/SiO2-IM, prepared through the impregnation method, exhibited the highest activity, with PET conversion and DMT selectivity reaching 92.35% and 99.0%, respectively, at 200 °C without any initial gas pressure. The exceptional performance of Cu/SiO2-IM can be attributed to its small metal particles, substantial specific surface area, a high ratio of Brønsted acid sites (BAS) to Lewis acid sites (LAS) and the balance of Cu+ and Cu0 active sites on the catalytic surface. Furthermore, possible reaction mechanisms of Cu-based catalysts in the catalytic methanolysis of PET were investigated: Cu+ initiates the attack on the carbon groups along the long PET chain and enhances the nucleophilic attack during the depolymerization reaction, while Cu0 readily interacts with the hydroxyl group of methanol, leading to the formation of a new ester group between the oxygen atom in the hydroxyl group of methanol and the carbon atom in the CO group of PET polyester. This low-cost and high-efficiency catalytic methanolysis study provides a practical approach to PET waste plastic recycling.
研究领域:
化学工程
·
环境科学
·
材料科学
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2024
·
IF 6.3
Chuanxin Yang,Ronghui Han,Xiaoyu Guo,Shufen Zhang,Bingtao Tang,Yuang Zhang
Passive radiative cooling technology has received extensive attention as an environmentally friendly cooling solution. However, existing radiative coolers often suffer from complexities in preparation and high costs, limiting their practical applications. Here, a novel porous structure with randomly distributed microspheres is fabricated in a low-cost and simple method known as solvent volatilization-induced phase separation, employing polyvinylidene fluoride (PVDF) and monodispersed SiO 2 microspheres. Utilizing the regulation of parameters such as the size of the pores and microspheres, controllable multi-scattering of light by the microstructures is achieved. The porous PVDF/SiO 2 film, with an average solar reflectance of 93.8% and an average atmospheric window emissivity of 0.958, is self-supporting and exhibits excellent flexibility and mechanical strength. When applied to closed and windowed models, the porous PVDF/SiO 2 film effectively lowers the internal temperatures by an average of 7.0 °C and 4.6 °C in summer, respectively, and by an average of 6.7 °C and 4.4 °C in spring. This work provides a viable strategy for achieving efficient radiative cooling and improving building energy management in a simple, cost-effective, and scalable manner.
研究领域:
材料科学
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环境科学
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NEW JOURNAL OF CHEMISTRY
·
2018
·Vol. 42
·期 24
·20032-20040
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IF 3.201
Yue-Wei Sun,Lan-Zhi Wang
Several novel three-component or domino reactions that enable a variety of unique heterocyclic scaffolds through carbon–carbon and carbon–nitrogen bond formations are herein reported. These reactions employing a one-pot strategy provide an efficient approach for the synthesis of benzodiazepines with tricyclic or tetracyclic systems containing aryl, carboxyl, ester and acyl groups. The main objective of this methodology is to achieve the compatibility of various functional groups via introducing active groups under mild reaction conditions. 40 new compounds were successfully synthesized in good to excellent yields (82–97%) from readily available 1,2-phenylenediamine, β-cyclodione and aldehyde derivatives by using a mild catalyst (γ-Fe2O3@SiO2/CeCl3). Structures of all the products were fully confirmed by spectroscopic techniques and by recording the single crystal XRD of 5bac. Moreover, a plausible reaction mechanism has been proposed.
研究领域:
有机化学
·
药物化学
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高影响因子
TEXTILE RESEARCH JOURNAL
·
2013
·
IF 1.135
Shan Li,Yan Wang,Juan Ding,Huimin Wu,Yaqin Fu
A shear thickening fluid (STF) was prepared from SiO2/PEG200 by ball-milling and its effect on the sound insulation properties of textile materials investigated. The rheological properties of the STF were evaluated using a high-speed rotary rheometer and a field emission scanning electron microscope. Fabrics based on fibers of profiled cross-section were knitted on a computerized flat knitting machine, then dipped in the diluted STF and the microstructure and the sound insulating properties of the STF-treated fabrics were established using a two-channel acoustic analyzer. It was found that an increase in the SiO2 content of the STF decreased the critical shear rate, and the thickening effect of the STF system became effective once the SiO2 content reached 30 wt%. The sound insulation performance of the STF-treated fabrics was superior to that of the untreated fabrics, and their level of sound insulation level was particularly increased with increasing surface density.
研究领域:
材料科学
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纺织工程
·
声学
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JOURNAL OF ORGANOMETALLIC CHEMISTRY
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2024
·
IF 2.1
Haijiao Jia,Yuchen Cui,Xiaoqian Yuan,Yanmei Xu,Youxin Li
A kind of magnetic hybrid organic-inorganic nanoparticles containing Ru metal (Fe 3 O 4 @SiO 2 -FPBA-Ru) was prepared. It was spherical with the characteristic lattice fringe of ruthenium atom. The size was in the range of 5–15 nm and it contained 0.30 mmol/g Ru. Its saturation magnetization value was 15.95 emu/g, which could be easily and efficiently recovered from solution through an external magnet. It was also stable below 240°C and hot filtration experiment proved Ru wasn't leaked from Fe 3 O 4 @SiO 2 -FPBA-Ru in 70°C oxidation reaction. It could be recovered and reused at least 7 cycles. The low amount of Fe 3 O 4 @SiO 2 -FPBA-Ru (75 mmol%) could convert the 99 % of 1-phenylethanol to acetophenone under solvent-free system, which verified its green and environment-friendly properties. The yield was exceed that of homogeneous (RuCl 3 , 85 %). Beside this, the TON (5181), TOF (7430 h −1 ) in oxidation of 1-phenylethanol and high conversion yields for a series of oxidation reactions of aromatic secondary alcohols proved the high catalytic ability of Fe 3 O 4 @SiO 2 -FPBA-Ru. These laid a foundation for its industrial applications.
研究领域:
材料科学
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催化化学
·
环境科学
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高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yanbin Meng,Zixuan Zhang,Yuyuan Zhao,Chuanqing Cong
Waterborne acrylic coating is widely used in the maritime anticorrosion field. However, the corrosion of metals caused by microorganism adhesion is often neglected. The objective of this study was to devise a facile method for the preparation of waterborne acrylic coatings endowed with anticorrosive and antibacterial capabilities. In view of this, a bactericidal nanofiller QAS@SiO2 was prepared by a hydrolytic condensation reaction between dimethyloctadecyl [3-(trimethoxysilyl) propyl] ammonium chloride (QAS) and SiO2 nanoparticles. Subsequently, the QAS@SiO2 nanofillers were further blended with cross-linked fluoro-silicon polyacrylate polyurethane hybrid emulsion (CFSAU-8) to obtain QAS@SiO2/CFSAU coatings with integrated anticorrosive and antibacterial properties. The results indicated that the grafting efficiency of QAS on SiO2 attained the highest (15.99%) when the QAS content was 20 wt %. The investigations into the effects of adding different amounts of QAS@SiO2 on coating properties revealed that when the content of QAS@SiO2 was 3 wt %, the obtained 3%QAS@SiO2/CFSAU exhibited the lowest water absorption, good mechanical properties, high antiwear properties, better antibacterial properties, and excellent antifouling properties and still possessed high anticorrosion properties. In the corrosion tests after 5 days, the excellent comprehensive properties suggested that the coating has great potential for applications in the long-term maritime protection field.
研究领域:
材料科学
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化学工程
·
生物技术
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危险品化学品经营许可证（带存储）