LANGMUIR
·
2022
·
IF 4.331
Qiangtao Zhu,Dongyu Pan,Yangyi Sun,Dongming Qi
Hollow structures in TiO2 materials can enhance the photocatalytic properties by reducing the diffusion length and improving the accessibility of active sites for the reactants. However, existing approaches for preparing hollow TiO2 materials have two drawbacks that restrict their engineering applicability: first, a heavy reliance on templates to form a hollow structure, which makes the preparation laborious, complicated, and costly; second, difficult-to-achieve high crystallization while maintaining the small grain size in calcinated TiO2, which is crucial for enhancing photocatalytic activity. Herein, a simple, effective method is proposed that not only enables the preparation of hybrid TiO2–SiO2 hollow spheres without the template fabrication and removal process via microemulsion technology but also achieves both high crystallization and a small grain size in calcinated TiO2 at once through the calcination of amorphous TiO2 with organosilane at a high temperature of 850 °C. The prepared TiO2–SiO2 hollow spheres with tunable sizes demonstrate high photocatalytic activity with a maximum k value of 133.74 × 10–3 min–1, which is superior to commercial photocatalyst P25 (k = 114.97 × 10–3 min–1). In addition, Au can be doped in the hybrid TiO2–SiO2 shell to gain Au-doped hollow spheres that show a high k value of up to 694.14 × 10–3 min–1, which is 6 times larger than that of P25 and much better than that reported in the literature. This study not only provides an effective approach to stabilize and tune the grain growth of the TiO2 photocatalyst during calcination but also enables the simple preparation of hollow TiO2-based materials with controllable hollow nanostructures.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Liuting Shi,Jia Hu,XuDong Lin,Liang Fang,Fang Wu,Jiao Xie,FanMing Meng
Composite coatings consisting of polyphenylene sulfide (PPS), polytetrafluoroethylene (PTFE) and 40 nm silicon dioxide (SiO 2 ) nanoparticles (PPS-PTFE/SiO 2 ) with SiO 2 in the range of 0–4 g/l were successfully prepared on AZ31 Mg alloys by a simple spray process. The morphology, composition, water contact angle (WCA), wear behavior and corrosion properties of the composite coatings were measured by using SEM, FT-IR, OCA20, sandpaper abrasion and electrochemical workstation, respectively. Effects of SiO 2 content on the wear behavior and corrosion properties of the coatings were studied. It is found that micro-sized protrusions distribute on the surface of the coatings, and a fibrous-network structure of PTFE arranges on the protrusions. WCAs of the PPS-PTFE/SiO 2 (0–4 g/l) coating are in the range of (152°–145.5°) ± 0.3° and the sliding angles (SAs) are less than 5°. The WCAs of the un-abraded and 10 m-abraded-on-sandpaper PPS-PTFE/SiO 2 (4 g/l) coating are 145.5°±0.3° and 142.5°±0.3°, respectively, implying the PPS-PTFE/SiO 2 coating is a robust superhydrophobic one with good wear resistance. Due to the superhydrophobic characteristics, the PPS-PTFE-based coatings show superior corrosion resistance in 3.5 wt% NaCl solution to pristine AZ31 Mg alloys. Owing to the excellent superhydrophobicity, wear resistance and corrosion resistance properties, the robust PPS-PTFE/SiO 2 coating is regarded to possess great potential to be applied in automobiles and navigation industries in future.
研究领域:
材料科学
·
表面工程
·
腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2023
·
IF 4.6
Jianchun Niu,Shuomeng Zhang,Yunqi Li,Xiaoyu Li,Jialin Zhang,Shanfu Lu,Qinggang He
The operating temperature of modified Nafion membranes remains too low to satisfy the requirements for high-temperature proton exchange membrane fuel cells (HT-PEMFCs) because most can only operate well below 120 °C. In this article, we prepare a series of Nafion/SiO 2 composite membranes with different contents of doped silica nanoparticles by in situ growth of SiO 2 nanoparticles near the –SO 3 H group. The water dynamic change process and the functional properties of Nafion/SiO 2 composite membranes are studied and found to correlate well with structural parameters, such as crystallinity and average chain spacing. Also, microstructure information including the phase separation structure changes, structural complexity, and ion cluster fraction of Nafion/SiO 2 composite membranes at different temperatures are investigated using synchrotron-based in situ small angle X-ray scattering (SAXS). Differing from expectations, the amount of water in the Nafion/SiO 2 composite membranes may not be the decisive factor to maintain proton conductivity at relatively high temperatures. Instead, the complexity or connectivity of the proton transport channel may play a more important role in the effective proton transfer inside the composite membranes, which also provides valuable guidance and insight for the development of novel HT-PEM materials with well-designed ion transport pathways in the future.
研究领域:
材料科学
·
燃料电池研究
✓ 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 APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 31
·e55738
·
IF 2.7
Liangyong He,Yuqing Yang,Bin Yang,Weiqiang Hu,Zhengzhi Zheng,Tianyu Lu,Haijia He,Jiasheng Qian,Yaoyang Chen,Weiguo Zhang,Yuchao Ke
In recent years, optical diffusion film materials with high transmittance and high haze have been widely reported, while there is relatively rare research on their functionalization and practical application especially in real scenario. In this work, optical diffusion films using polymethyl methacrylate (PMMA)@TiO 2 @SiO 2 (P@T@S) composite microspheres were fabricated, which exhibited sufficiently high light transmittance and haze. The binding mode of PMMA microspheres and nanoparticles suggested that PMMA microspheres with a positive surface potential combined with nanoparticles with a negative surface potential through electrostatic attraction to achieve mutual binding. The prepared P@T@S composite microspheres showed better heat and swelling resistance than those of PMMA microspheres. The P@T@S diffusion film, whose excellent light diffusion effect was clearly demonstrated, exhibited the best optical performance among all optical diffusion films prepared. After passing through the P@T@S diffusion film, the laser light was not only uniform but also bright. The findings from this work can provide some insight into further research on optical diffusion films applied in optoelectronic device areas.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2020
·
IF 1.943
Jiuxiao Dong,Peiying Li,Hongyu Guan,Chunhua Ge,Yufeng Bai,Yuhui Zhao,Xiangdong Zhang
We use photosensitive resin as material, and adopt 3D printing and pyrolysis to prepare silica ceramics. HKUST-1 was grown on the ceramic surface by step-by-step in-situ growth method to obtain the HKUST-1/SiO 2 composite material. The HKUST-1/SiO 2 composite material was characterized by X-ray powder diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), thermogravimetric analysis (TG). The HKUST-1/SiO 2 composite material not only has the characteristics of HKUST-1 and SiO 2 , but also can be designed into different complex shapes. In addition, the composite can be easy to separate from the product without centrifugation or filtration after the reaction is completed. The application of benzyl alcohol oxidation was an example to the performance of composite catalysts.
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
PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Yi Wu,Kai Yan,Guilin Xu,Chenguang Yang,Dong Wang
Re-entrant geometries can effectively trap air pockets, increase air/liquid interface fraction, prevent the penetration of low surface tension organic liquids, and achieve super-oleophobic performance. However, the creation of re-entrant geometries usually involving expensive lithographic tools, or complicated chemical procedures, and cannot be applied on a large scale, such super-oleophobic surfaces are unsuitable for practical application. Constructing hierarchical micro/nanostructure on substrates is a feasible solution to achieve super-oleophobicity through facile spraying method. Herein, we report a super-oleophobic TiO 2 /SiO 2 composite coatings by taking advantage of an exceedingly simple spraying method. The dendritic structures produced by spraying the TiO 2 /SiO 2 mixture play the critical role in obtaining the re-entrant geometry required for oleophobic surface, and the introduction of micron-scale TiO 2 particles and nano-scale SiO 2 particles provide an enough dual-scale rough structure for the coating. The TiO 2 /SiO 2 composite coatings exhibit superior repellence to high and low surface tension liquids as well long-term durability. This design strategy may provide useful guidelines for the fabrication of particle-based spray-coated super-oleophobic surfaces.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2019
·Vol. 29
·期 4
·1192-1197
·
IF 1.637
Zhao YingRui,Yang Chao,Zhang HongYan,Qiang Gen,Fan HuiLing
Two kinds of ZnO/SiO 2 composite (labled as SZ-1 and SZ-2) were synthesized by sol–gel method and characterized by X-ray diffraction (XRD) patterns, XPS (X-ray photoelectron spectroscopy) spectra and Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectra. Water adsorption on the prepared sample was studied by in situ DRIFT. The as-synthesized SZ-1 and SZ-2 sample have different surface property due to the various aging methods in the sample preparation processes, thus showing different results of water adsorption. The adsorption sites (Si atom in Si–O–Si bond) on the surface of SZ-2 for water molecule are occupied by the –OCH 3 group and the hydrophilicity of SZ-2 is weaker, in comparison to SZ-1, which inhibits the formation of water film and ultimately decreases desulfurization performance of SZ-2. So, the desulfurization performance can be changed by altering the hydrophilicity of sorbent.
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
Wenyuan Ye,Jinjie Chen,Na Kong,Qingyuan Fang,Mingqiu Hong,Yuxiang Sun,Yifan Li,Patricia Luis,Bart Van der Bruggen,Shengqiong Fang,Shuaifei Zhao,Jiuyang Lin,Shungui Zhou
Conventional membrane processes, e.g., microfiltration and ultrafiltration, suffer from severe permeation flux decline and fouling during the oily wastewater treatment. The superhydrophilic surface decoration provides an important and effective strategy to address this challenge. Herein, a surperhydrophilic/underwater superoleophobic nanocomposite surface with the photocatalytic properties was constructed via one-step facile vacuum-assisted filtration of a g-C 3 N 4 nanosheet/SiO 2 nanoparticle dispersion onto a microfiltration membrane substrate. Specifically, with the intercalation of 20 mg∙L −1 SiO 2 nanoparticles into the g-C 3 N 4 nanosheets, the g-C 3 N 4 /SiO 2 composite membrane showed the superhydrophilic/underwater superoleophobic properties with an underwater oil contact angle of 170.0 ± 0.3°. Such a g-C 3 N 4 /SiO 2 composite membrane yielded a permeation flux of >1290 LMH·bar −1 with an oil rejection of >99.91% during the vacuum filtration of oil-in-water emulsions. The g-C 3 N 4 /SiO 2 composite membrane significantly outperformed the pristine microfiltration substrate that had severe fouling caused by oil blockage. Additionally, the g-C 3 N 4 /SiO 2 composite membrane not only effectively retained the E. coli bacteria through size exclusion effect, but also promoted the inactivation of bacteria via visible-light photocatalysis. Therefore, our membrane has a great promise in practical oily wastewater treatment due to its excellent separation performance and biofouling resistance.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2023
·
IF 3.5
Yuhan Ren,Biao Zhang,Jian Ye,Haoqian Zhang,Zhaoxin Zhong,Yang Wang,Feng Ye
This study successfully prepared a series of novel Y 2 O 3 -SiO 2 composite aerogels using sol-gel methods. The high-temperature calcined SiO 2 -poor aerogels exhibit excellent high-temperature thermal stability in terms of shrinkage, porosity, and BET surface area maintenance. SiO 2 -rich aerogels exhibit more pronounced mesoporous material properties, the BET surface area and pore volume of sample Y2S1 reached 291.04 m 2 /g and 0.50 cm 3 /g, an increase of 278.71% and 297.78% over the pure Y 2 O 3 aerogel, respectively. In addition, compared with untreated mullite fiber, the thermal conductivity of the mullite fiber after impregnation with Y 2 O 3 -SiO 2 composite aerogels decreased by 35.32–45.77% at 300 °C, which is similar to the performance of impregnation with Al 2 O 3 -SiO 2 composite aerogel (38.31%). Moreover, the Y 2 O 3 -SiO 2 composite aerogel with a high BET surface area may have potential applications in the field of luminescent materials such as phosphors due to the intrinsic electronic structure of the rare-earth yttrium and its fantastic optical properties.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2023
·
IF 8.4
Huaqin Huang,Jian Wang,Zhenghao Cui,Zihan Gao,Zhenyi Huang,Zhaoyang Wu
This study introduces an approach to fabricating soft magnetic composites (SMCs) that effectively address core loss while maintaining high magnetic conductivity. During the sintering process in a water vapor environment, the CeO 2 insulation layer facilitates the selective oxidation of Si while simultaneously impeding the outward diffusion of Fe and Cr. Consequently, a CeO 2 ·SiO 2 composite insulation layer forms within the FeSiCr-based SMCs. The FeSiCr-based SMCs with the CeO 2 ·SiO 2 composite insulation layer achieve a saturation magnetization of 153.1 emu/g, which is 10.9% lower than that of FeSi 3.7 Cr 4.5 compacts, and exhibits a deterioration rate lower than previously reported values. Moreover, the permeability of the FeSiCr-based SMCs remains highly stable, demonstrating outstanding insulation characteristics. The total core loss and core loss separation results further corroborate that incorporating a CeO 2 ·SiO 2 composite insulation layer leads to a more pronounced reduction in interparticle eddy current loss than using a CeO 2 insulating layer alone. This performance enhancement can be attributed to the selective oxidation of a rare metal oxide insulation layer on a ferromagnetic metal particle substrate, a technique applied to SMCs for the first time. These findings hold significant implications for the design of high-performance SMCs in miniaturized and lightweight electromagnetic devices.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Chuyang Liu,Taian He,Congcong Hu,Qi Qian,Yilin Hao,Lu Xu,Hengyi Lu,Guangbin Ji
In contemporary times, radar and infrared-compatible stealth materials have emerged as a pivotal domain of research globally, aimed at augmenting the survivability of military assets. However, current candidates generally exhibit subpar compatibility performance in elevated temperature environments due to the imbalanced interplay between the two spectral bands. In this work, a meticulously designed sandwich-structure SiO 2 /C@SiC/SiO 2 composite is proposed to cope with the challenge. The middle layer of C@SiC composites possesses excellent microwave absorption performance even at high temperatures. The outer layers of SiO 2 aerogels serve not only to inhibit the infrared radiation intensity, but also reinforce the microwave absorption capacity by optimizing the impedance matching and reducing the heat transferred to the middle layer. Based on the numerical simulation outcomes, the thickness of each layer has been optimized to attain a harmonious balance between microwave absorption and infrared radiation properties. Ultimately, the sandwich structured SiO 2 /C@SiC/SiO 2 composites demonstrate low RL (reflection loss) values (←5 dB) across nearly the entire X band (8–12 GHz), alongside minimal surface temperatures hovering ≈44 °C at an ambient temperature of 200 °C. The comprehensive investigation into impact patterns and underlying mechanisms offers invaluable insights to develop radar and infrared-compatible stealth materials for high-temperature applications, which can be applied as stealth coatings on the skin of high Mach number aircraft.
研究领域:
材料科学
·
隐身技术
·
数值模拟
✓ 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）