MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Maosheng Zhang,Zhiqiang Shi,Yongcun Zou,Zongtao Zhang,Runwei Wang,Shilun Qiu
Porous carbons with controlled pore structure have attracted great interest owing to their excellent application potential. Herein, we report a simple synthetic route to synthesize the core-shell C@SiO 2 spheres with various pore structures by calcining core-shell structured RF@SiO 2 (RF = resorcinol-formaldehyde resin). The obtained C@SiO 2 spheres had high surface areas (238.5–732.5 m 2 /g), large pore volume (0.111–0.647 cm 3 /g) and abundant micro-mesoporous structure. The mesopore size of C@SiO 2 spheres can be easily turned in the range of 8–15 nm, by simply modifying the carbonization temperature, size and heating rate of RF@SiO 2 spheres. Among these, S–C@SiO 2 -400 spheres had higher mesopore volume of 0.207 cm 3 /g, this was related to internal carbon slices structure. Meantime, the toluene adsorption capacity of S–C@SiO 2 -400 spheres could reach 448.2 mg/g, which increased by 88.73% compared to ordinary carbon spheres. Moreover, the formation mechanism of the mesopore carbon slices structure was evaluated based on controlled experiments. This work provides a new synthetic method of micro-mesoporous carbon spheres, which can further enrich the application of carbon materials.
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
APL Materials
·
2023
·Vol. 11
·期 10
·
IF 6.1
Li Xia,Deng Min,Cao Tingting,Ma Jun,Geng Shuo,Ren Yuan,Yao Mengqin,Liu Fei,Dong Yonggang
Formic acid (FA, HCOOH), as a liquid chemical hydrogen storage carrier with low cost, high hydrogen content, and convenient storage and transportation, has attracted extensive attention. Pd-based catalysts for hydrogen production from FA are easy to aggregate and deactivate in the reaction process, which hinders the further development of FA as a hydrogen storage carrier. Therefore, the exploitation of carriers with simple preparation methods and excellent performance can effectively improve the catalytic activity of Pd-based catalysts. Porous carbon and SiO 2 have been widely used for their unique structural properties, and the preparation of composite carriers by combining the advantages of both is a current research hotspot. Herein, this work synthesized C–SiO 2 for the deposition of Pd nanoparticles by a one-step method, and the obtained Pd/C–SiO 2 exhibits a superior FA dehydrogenation activity with a turnover frequency value of 1278 h −1 and a favorable stability with only a slight decrease in activity after five cycles.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2019
·Vol. 89
·期 3
·623-633
·
IF 1.986
An Zhimin,Ye Changshou,Zhang Rubing,Qu Qiang
Abstract A C/SiO 2 /SiC ternary aerogel was prepared from a formaldehyde–catechol/silicon source via the sol−gel method, supercritical drying, and high-temperature carbothermal reduction. The effects of different carbon/silicon molar ratios on the microstructure, chemical composition, and mechanical and shielding properties of the C/SiO 2 /SiC aerogels were investigated. The fabricated aerogels exhibited low density of 0.118–0.271 g/cm 3 , low thermal conductivity of 0.044 to 0.089 W/(m∙K) and a high specific surface area of 774 m 2 /g. The aerogel exhibited electromagnetic interference shielding effectiveness (SE) properties; the maximum SE value was 24 dB over 12.4–18.0 GHz with an absorption-dominant shielding characteristic. To improve the mechanical properties of the ternary aerogel, novel SiC w -C/SiO 2 /SiC aerogel composites were prepared by adding different contents of SiC whiskers into precursor solutions. The mechanism affecting thermal and mechanical properties of aerogel composites was investigated. This composite having high strength and low thermal conductivity had potential applications in space shuttles and reusable carrier thermal protection materials.
The fabricated C/SiO 2 /SiC ternary aerogels exhibited low density of 0.118–0.271 g/cm 3 and low thermal conductivity of 0.044−0.089 W/(m∙K). The aerogel exhibited electromagnetic interference shielding effectiveness (SE) properties; the maximum SE value was 24 dB over 12.4–18.0 GHz with an absorption-dominant shielding characteristic.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 24
·7970
·
IF 4.6
Gang Deng,Lu Yao,Mingzhao Chen,Yuanyuan Yang,Song Lu,Guohua Wu
With the improvement in people’s living standards, the development and application of smart textiles are receiving increasing attention. In this study, a carbon nanosurface was successfully coated with a SiO2layer to form C@SiO2nanomaterials, which improved the dispersion of carbon nanomaterials in an aqueous solution and enhanced the absorption of light by the carbon nanoparticles. C@SiO2nanoparticles were coupled on the surface of silk fabric with the silane coupling agent KH570 to form C@SiO2nanosilk fabric. The silk fabric that was subjected to such surface modification was endowed with a special photothermal function. The results obtained with scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and infrared spectroscopy (FTIR) showed that C@SiO2nanoparticles were successfully modified on the surface of the silk fabric. In addition, under the irradiation of near-infrared light with a power of 20 W and a wavelength of 808 nm, the C@SiO2nanosilk fabric experienced rapid warming from 23 °C to 60 °C within 30 s. After subjecting the functional fabric to hundreds of photothermal experiments and multiple washes, the photothermal efficiency remained largely unchanged and proved to be durable and stable. In addition, the thermogravimetric (TG) analysis results showed that the C@SiO2nanoparticles contributed to the thermal stability of the silk fabric. The UV transmittance results indicated that C@SiO2nanofabric is UV-resistant. The silk modification method developed in this study is low-cost, efficient, and environmentally friendly. It has some prospects for future applications in the textile industry.
研究领域:
材料科学
·
纺织工程
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Huixian Zhou,Yiqing Zeng,Zexian Low,Feng Zhang,Zhaoxiang Zhong,Weihong Xing
Developing cost-effective and high-efficient air purification materials for enhancing the indoor air quality has been an ongoing concern. Herein, MnO 2 /Co–C catalyst layers were wrapped on SiO 2 nanofiber by a combination of thermal pyrolysis and redox reaction method to prepare catalytic membranes (MCCS-x) for the efficient purification of indoor PM and HCHO. The core-dual-shell structure maintains the pore structure of the membrane, providing high gas permeability of 670 m 3 ·m −2 ·h −1 ·kPa −1 . Owing to the introduction of MnO 2 /Co–C enhanced the capture of PM, the optimized MCCS-2 exhibits high filtration efficiency of PM 0.3 and PM 2.5 (99.60% and 99.99%) with a low pressure drop (<80 Pa). In addition, MCCS-2 achieves 100% HCHO removal efficiency at room temperature due to its large specific surface area, high redox property and abundant Mn 4+ and oxygen species. The appropriate proportion of Mn/Co bimetallic sites synergy inhibits the formation of formate and carbonate intermediate species, thus MCCS-2 possesses excellent long-term catalytic stability than contrast sample (MCCS-3 and MS). This work demonstrates a new approach for the fabrication of high-performance catalytic membrane materials for indoor air purification.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Huixian Zhou,Hui Zhong,Yiqing Zeng,Yutang Kang,Bin Chen,Shuanglu Ma,Yifan Li,Yu Zhang,Shasha Feng,Zhaoxiang Zhong,Weihong Xing
The strategy of constructing catalytic membrane has a significant influence on its structure and performance. In this work, Co 3 O 4 -C x @SiO 2 nanofiber membranes (NFMs) were fabricated by an in-situ growth–pyrolysis–oxidation strategy. The Co 3 O 4 -C x catalyst derived from ZIF-67 was wrapped around nanofibers, which helps to maintain a stable membrane structure, then suppressing the reduction of gas permeability. Among the Co 3 O 4 -C x catalyst, the carbon skeleton can prevent the agglomeration of Co 3 O 4 nanoparticles, obtaining an ultra-fine Co 3 O 4 nanoparticles with high dispersibility, redox property and surface area. The obtained Co 3 O 4 -C 300 @SiO 2 NFM exhibits outstanding ammonia selective catalytic reduction (NH 3 -SCR) denitrification activity (T 90 = 225 °C at a GHSV of 77,000 h −1 ). The effect of catalyst loading on PM 2.5 filtration performance of SiO 2 NFM was also tested. Co 3 O 4 -C 300 @SiO 2 NFM has higher filtration efficiency (99.99%) than SiO 2 NFM at a lower pressure drop of 58 Pa, which suggests that catalyst loading via our method can improve the filtration performance of SiO 2 NFM. This work might provide a universal strategy for the design and preparation of highly efficient catalytic membrane.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2021
·
IF 7.312
Yijie Feng,Wenjiao Sang,Zhiyi Deng,Shiyang Zhang,Cuihua Li
Co-N-C@SiO 2 with Co, N doped carbon as core and SiO 2 as shell was successfully synthesized by template method, and SiO 2 shell was about 43 wt%. Impressively, the SiO 2 shell increased the active sites of the core in Co-N-C@SiO 2 preparation, and reduced the loss of active sites during use. Co-N-C@SiO 2 /PMS was a 1 O 2 dominated non-radical reaction, which was less interfered by solution pH and water constituents. In addition, Co-N-C@SiO 2 possessed better cycling performance compared with Co-N-C. Finally, the possible SMX degradation pathways were presented based on the identified intermediate products.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2021
·
IF 4.833
Zhihuan Zhao,Pengfei Yang,Xiao Zhang,ShashaYang,Jianying Lin,Jimin Fan,Bing Zhang
MoS 2 /C@SiO 2 spheres were successfully synthesized by a one-step hydrothermal method using silica as the template, sodium molybdate as the Mo source and glucose as the carbon precursor. In this paper, the antitumor ability of MoS 2 /C@SiO 2 and C@SiO 2 nanospheres was evaluated through the photothermal effect induced by near infrared (NIR) spectroscopy and the drug loading and release behaviors of the model drug doxorubicin (DOX). The photothermal conversion efficiency (η) of MoS 2 /C@SiO 2 of 42.5% was 1.2 times that of C@SiO 2 (34.7%), which indicated its significant photothermal effect. The drug loading of MoS 2 /C@SiO 2 of 46.5% was much higher than that of C@SiO 2 (12.4%); it was 3.75 times that of C@SiO 2 . The cumulative drug release of MoS 2 /C@SiO 2 and C@SiO 2 under a simulated acidic tumor environment and NIR irradiation was 58.9% and 27.29%, respectively. Moreover, the cell viability assays verified that MoS 2 /C@SiO 2 -DOX had excellent antitumor ability under the co-stimulation of endogenous (pH) and exogenous (NIR) compared with C@SiO 2 -DOX. The experimental results showed that the survival rate of cancer cells in MoS 2 /C@SiO 2 -DOX under coordinated treatment was only 19.4%, while that of C@SiO 2 -DOX was 24.6%.
研究领域:
生物医学工程
·
纳米医学
·
肿瘤学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Huiyu Tian,Haifeng En,Bingwen Li,Jinxian Zhao
An efficient Cu@C/SiO 2 catalyst for the hydrogenation of dimethyl oxalate (DMO) to methyl glycolate (MG) was prepared by sorbitol-modified ammonia evaporation method followed by calcination in N 2 . The Cu@C/SiO 2 catalyst exhibited the superior catalytic activity and stability for DMO hydrogenation compared with the Cu/SiO 2 catalyst. The optimized Cu@C/SiO 2 –1/4 catalyst exhibited an MG yield of 63 % during 90 h long-term evaluation under temperature of 210 °C, pressure of 1.9 MPa, WHSV of 1.25 g DMO ·g Cu -1 ·h -1 and H 2 /DMO of 150. The characterization results indicated that Cu dispersion can be significantly enhanced by the addition of an appropriate amount of sorbitol and the surface Cu 0 and Cu + species were effectively regulated by the amount of sorbitol. The catalytic activity of Cu@C/SiO 2 was linearly dependent on specific area of Cu + species under the sufficient specific area of Cu° for H 2 dissociation. In addition, the sorbitol–derived carbon species on the catalyst were also favorable for the enhanced stability owing to the suppression of Cu sintering.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2024
·
IF 4.5
Yan Wang,Jiaqi Lu,Menghui Wan,Yanbao Zhao
Asymmetric nanocarriers with different functions can achieve synergistic effect in cancer treatment. In this study, asymmetric carbon-silica (C-SiO 2 ) carriers were prepared for drug delivery and combining therapy. The C-SiO 2 carriers presented acorn-like structure with dendritic mesoporous silica hat and carbon body. The carbon body render the carriers photothermal effect. The prepared C-SiO 2 carriers with size around 130 nm have improving cell uptake efficiency, and excellent biocompatibility. After loading doxorubicin hydrochloride (DOX), menthol (LM) was used to seal the loaded drug (DOX@C-SiO 2 -LM). LM coating can melt above the phase transition temperature, leading to the release of loaded cargo. The DOX@C-SiO 2 -LM displayed temperature/NIR-triggered drug release.
研究领域:
纳米技术
·
药学
·
生物医学工程
·
癌症治疗
✓ 已验证
产品关联
DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
·
2023
·
IF 5.4
Yang Guo,Xiaoying Guo,Haipeng Lu,Xian Jian
Developing high–efficient microwave absorbing (MA) materials with anti–corrosion (AC) properties to tackle the harsh hygrothermal marine conditions remains a challenge. Herein, we employed catalytic chemical vapor deposition and the Stöber technique to fabricate gradient multilayer interface–coupled FeNi@C@SiO 2 composites, guided by the hetero–interface engineering. The resulting composites exhibited exceptional MA properties and AC behavior. Specifically, they showcased a remarkable effective absorption bandwidth of 6.27 GHz at 1.40 mm, outperforming that of FeNi (3.80 GHz). This improved bandwidth was attributed to the electron conduction pathway provided by the C layer, which facilitated electron migration and hopping. The C@SiO 2 layer, containing defects and –OH functional groups, induced abundant dipole polarization and optimizes the impedance matching of FeNi. Furthermore, the RCS reduction value of FeNi@C@SiO 2 could reach 16.73 dB·m 2 . Moreover, the corrosion rate of FeNi@C@SiO 2 was 7.48 × 10 −11 m/s, significantly lower than that of FeNi (1.29 × 10 −10 m/s). This reduction was primarily due to the intrinsic inertness and impermeability of the C@SiO 2 layer, effectively isolating the corrosive medium from the substrate. This investigation presents a novel point of reference for the advancement of bifunctional MA materials intended to cope with extreme environments.
研究领域:
材料科学
·
纳米复合材料
·
表面工程
·
电磁功能材料
·
腐蚀防护
✓ 已验证
DOI
高影响因子
TALANTA
·
2020
·
IF 5.339
Dandan Song,Jing Zheng,Nosang V. Myung,Jingli Xu,Min Zhang
A sandwich-type electrochemical immunosensor was developed for the detection of CEA where hollow magnetic silica coated nickel/carbon (Ni/ [email protected] 2 ) nanocomposites was used as an immobilized carrier and gold nanoparticle-coated PANI microsphere ( [email protected] @Au) as electrochemical transducer. Magnetic assembly of Ni/ [email protected] 2 nanocomposites allow easy separation and assembly which eliminates the further modification process. In addition, the prepared [email protected] @Au possess good biocompatibility, and electrical conductivity. The fabricated immunosensor show excellent sensing performance including a wide dynamic range from 0.006 to 12.00 ng mL −1 and low detection limit at 1.56 pg mL −1 . Moreover, this sensor shows superior selectivity with excellent reliability and reproducibility which might lead into easier implementation in clinical setting.
研究领域:
生物化学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）