MATERIALS RESEARCH BULLETIN
·
2021
·
IF 4.641
Wen Ge,Xiaohui Zhang,Xiutao Ge,Kong Liu
Herein, a novel gas-sensing nanocomposite of α-Fe 2 O 3 / x %SiO 2 ( x = 0, 10, 15, 20, 30) was synthesized for the first time by sol-gel. With an increase in SiO 2 concentration to 30 %, the average crystallite size and pore-size distribution of samples exhibited a decreasing trend. The surface area also showed an increasing trend with the introduction of SiO 2 . Gas-sensing measurement results revealed that the α-Fe 2 O 3 /20 %SiO 2 nanocomposite showed the highest response (R a /R g = 50.20) to 500 ppm acetone at its optimal operating temperature of 290 °C, which was about 34 times higher than that of the pure α-Fe 2 O 3 gas sensor. The response/recovery time of the α-Fe 2 O 3 /20 %SiO 2 -based sensor to 500 ppm acetone was 14 s/7 s. The response/recovery time of α-Fe 2 O 3 was 25 s/21 s. After SiO 2 was modified, the response/recovery speed increased. The results demonstrated the potential of α-Fe 2 O 3 /20 %SiO 2 -based gas sensors for sensitive and selective detection of acetone.
研究领域:
材料科学
·
传感器技术
✓ 已验证
DOI
高影响因子
Inorganic and Nano-Metal Chemistry
·
2017
·
IF 0
Caina Li,Zhihua Zhao,Yukun Liu,Dongxia He,Xiaoqing Shen
Al2O3-SiO2 composite nanofibers were fabricated by calcining the precursor fibers obtained through sol–gel processing and electrospinning technique. Thermogravity-differential scanning calorimeter, powder X-ray diffraction, X-ray fluorescence analysis, scanning electron microscopy, transmission electron microscopy, and thermal conductivity instrument were employed to characterize the fibers. Upon calcining the precursor fibers at 1300°C, continuous Al2O3-SiO2 composite nanofibers with diameter of about 300 nm can be obtained. The calcined fibers had low thermal conductivity, which might favor their application in high-temperature insulation areas.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Shujian Wang,Chunzheng Wu,Hongbo Yu,Tong Li,Xuedong Yan,Bo Yan,Hongfeng Yin
Nanosized Ir catalysts suffer from serious side reactions and poor stability during hydrogenation of substituted nitroaromatics to produce aromatic amines. In this work, core–shell nanostructures with sub-4 nm Ir-CoOx hybrid cores and mesoporous SiO2 shells were designed and prepared to overcome these problems. The Ir-CoOx hybrid cores were converted from IrCo alloy nanoparticles (NPs) inside SiO2 through in situ calcination and reduction pretreatments. The SiO2 mesoporous shells in Ir-CoOx@SiO2 nanoreactors prevented the agglomeration/sintering of IrCo NPs, while allowing the free reactants and products (big molecules). The synergy between Ir and CoOx species improved H2 adsorption, thus affecting the reaction rate as well as the selectivity to aromatic amines. As a result, the obtained Ir-CoOx@SiO2 nanocatalyst showed tremendous improvement in catalytic activity, selectivity, and stability.
研究领域:
材料科学
·
化学工程
·
催化反应
✓ 已验证
DOI
高影响因子
Energy Technology
·
2025
·
IF 3.6
Ming Yan,Haoyu Chen,Yu Zhu,Yuxiao Deng,Zhuanlong Yan,Ziyi Lu,Yanlin Chen
In this study, NH 2 –SiO 2 @Ti 3 C 2 T x core–shell microspheres with different Ti 3 C 2 T x contents are prepared by coating Ti 3 C 2 T x nanosheets on the surfaces of SiO 2 microspheres using an electrostatic self-assembly method. The structures, elemental compositions, and microscopic morphologies of NH 2 –SiO 2 @Ti 3 C 2 T x microspheres are investigated by X-Ray diffraction, Fourier-transform infrared spectroscopy, field-emission scanning electron microscopy, and X-Ray photoelectron spectroscopy. The results show that Ti 3 C 2 T x nanosheets are uniformly coated on the surfaces of the SiO 2 microspheres, and the surfaces of the SiO 2 microspheres are modified by NH 2 . The maximum specific surface area of NH 2 –SiO 2 @Ti 3 C 2 T x composite doped with 15 wt% Ti 3 C 2 T x is 29.937 m 2 g −1 , with an average pore size of 0.11848 cm 3 g −1 . The electrochemical performance test results show that after 100 cycles at a C rate of 0.2C, the specific capacity of the NH 2 –SiO 2 @Ti 3 C 2 T x anode material increases by 270.1% compared to that of SiO 2 , reaching 142.5 mAh g −1 . Compared with SiO 2 , the NH 2 –SiO 2 @Ti 3 C 2 T x materials have higher electrical conductivities and Li ion diffusion rates, thereby improving their rate performances, and the discharge specific capacities and cycling stability are superior to those of the SiO 2 anode material.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2014
·
IF 2.129
Yongqiang Cao,Ning Liu,Ping Yang,Ruixia Shi,Qian Ma,Aiyu Zhang,Yuanna Zhu,Junpeng Wang,Jianrong Wang
The polyvinylpyrrolidone (PVP) hybrid luminescent micro-/nanofibers doped with the novel hybrid SiO 2 -coated CdTe nanocrystals (HS-CdTe NCs) have been fabricated for the first time via the electrospinning technique. The morphologies and photoluminescence (PL) emissions of HS-CdTe/PVP micro-/nanofibers prepared by doping the HS-CdTe NCs with the different PL peak wavelength (571, 616, and 643 nm) in PVP fibers were investigated by optical and PL microscope. The results revealed that all the HS-CdTe/PVP hybrid fibers showed an ultralong length for several hundreds of micrometers and a relatively uniform diameter of 1000 ∼ 1200 nm. The hybrid fibers displayed a wavelength-tunable PL emission, determining by the PL of doped HS-CdTe NCs. Moreover, similar to the original PL properties of HS-CdTe NCs before the electrospinning, the HS-CdTe/PVP fibers also showed a series of superior PL properties, such as narrow and symmetry PL spectrum, high, and uniform brightness. For comparison purpose, we also prepared three CdTe/PVP hybrid fibers by doping the 553 nm, 600 nm, and 633 nm PL-emitting CdTe NCs respectively in PVP electrospinning fibers. The characterization results showed that, the obtained three CdTe/PVP hybrid fibers had a basically satisfactory micro-/nanofiber morphology with a long length and relatively uniform diameter, but all the fibers exhibited very weak PL emissions. The enormous contrast in PL properties between HS-CdTe/PVP and CdTe/PVP fibers should mainly be ascribed to the different connection modes of ligands with the NCs and the passivation effect of inert hybrid silica shell on HS-CdTe. It is hopeful that the high luminescent HS-CdTe/PVP micro-/nanofibers with the tunable PL peak wavelength would be a good candidate in the optical sensor , light-emitting devices (LEDs), nanometer-scale waveguides , and the other related photonic materials.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Yanyan He,Lulu Zhang,Guantong Chen,Yuanhong Liu,Shuangshuang Shi,Panpan Jiang,Jie Ding,Shu Xu,Chong Geng
Achieving long-term stable lead halide perovskite nanocrystals (PNCs) in light-emitting devices remains a significant challenge because of their fast degradation upon exposure to light, moisture, and oxygen. Here, we report a facile one-pot strategy to realize the growth of crystalline ZnO/SiO 2 dual-layer encapsulation on CsPbBr 3 PNCs. The encapsulation provides the PNCs with robust surface passivation to withstand the harsh condition in hybrid light-emitting diodes (LEDs) with an on-chip packaging structure. The PNCs/ZnO/SiO 2 could preserve 100 % of their initial photoluminescence intensity after 500 h of continuous irradiation under a 9.6 W cm −2 blue laser. The fabricated green- and white-LEDs displayed constant light intensity at 80 % of their initial value with continuous driving at 10 mA for 500 h. We believe the excellent stability of the ZnO/SiO 2 encapsulated PNCs could strongly promote the development and application of perovskite-based light-emitting and other optoelectronic devices.
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
JOURNAL OF NON-CRYSTALLINE SOLIDS
·
2023
·
IF 3.5
Lin Wang,Dehua Ma,Chonghe Xu,Luyi Zhu,Yadong Lv
In this study, we successfully fabricated TiO 2 /SiO 2 ceramic nanofibrous membranes with different molar ratios using a combination of electrospinning and sol-gel technology. The resulting nanofibers were composed of amorphous SiO 2 and fine-grained anatase; the amorphous SiO 2 served as a lubricating zone and refined the rutile grains in the nanofiber structure. The hybrid nanofibrous membranes exhibited exceptional mechanical properties: the highest average tensile strength was 3.22 ± 0.98 MPa, which is threefold higher than that of the TiO 2 nanofibrous membranes. Consequently, the TiO 2 /SiO 2 nanofibrous membranes withstood stretching, bending, folding, and compressing processes without breaking. Furthermore, the average reflectance of the TiO 2 /SiO 2 nanofibrous membranes exceeded 89.57% in the range of 500–2500 nm, and their thermal conductivity at room temperature was below 0.0310 W·m − 1 K −1 . The flexible and robust ceramic materials have significant potential for various applications such as thermal insulation, flexible energy, and wearable electronics.
研究领域:
材料科学
·
纳米技术
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2015
·Vol. 88
·期 7
·1207-1218
·
IF 0.276
Yue Chuan-Jun,Gu Li-Ping,Zhuang Ya-Feng,Liu Bao-Liang
A new strategy was introduced for the catalytic resolution of 1,2-propanediol involving the successive oxidative kinetic resolution and asymmetric hydrogenation by two hydrogen transfer reactions catalyzed by nano SiO 2 -bonded Ru-TsDPEN [TsDPEN = N -( p -toluenesulfonyl)-1,2-diphenylethylene diamine]-derived catalysts composed of two opposite configurations. The catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetry-derivative thermogravimetry (TG-DTG) analysis, and inductively coupled plasma atomic emission spectrometry (ICP-AES). Results showed that Ru-TsDPEN derived catalysts were successfully grafted on the nano SiO 2 , affording high catalytic conversions of >99 and 99%, selectivities of 47 and 98% and maximum ee values of >99 and >99% in the two reactions, which were due to the nano SiO 2 with Ru-TsDPEN in the reaction system with high dispersion. Additionally, the catalysts exhibited excellent durability and were filtered and reused at least five times without noticeable catalysts deactivations.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2020
·
IF 4.217
Chunhong Qi,He Chen,Youyi Sun,Qiang Fu,Luyan shen,Xiaolin Li,Yaqing Liu
The superhydrophobic flower-like OTS-SiO 2 particles with tunable size were synthesized for application in anti-icing technology, in which the nanosilica fibers were grown on surface of SiO 2 sphere. Furthermore, the anti-icing process of flower-like OTS-SiO 2 particles was investigated by a high speed video and thermal infrared imaging equipment. It was found that the flower-like OTS-SiO 2 particles with a diameter of 300.0 nm showed best anti-icing ability, in which the frozen time of water droplets could be prolonged to 564.0 s at −25.0℃. The good anti-icing ability was attributed to micro-nano hierarchical structure and surface modification of flower-like OTS-SiO 2 particles. The work has an important guiding implication for the subsequent design and preparation of superhydrophobic particles for application in anti-icing technology.
研究领域:
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Hairong Wu,Wenhao Shao,Genglin Li,Jiawei Chang,Xiaoxuan Bai,Huaizhu Liu,Jiqing Guo,Xiaoliang Zhao,Jirui Hou
The use of nanofluids in formations with high temperatures and high salinity is currently encountering significant obstacles. Therefore, a Janus SiO 2 -surfactant dispersion consisting of Janus nanoparticles and surfactants was constructed in the current study. The Janus SiO 2 -surfactant dispersion is resistant to both high temperatures and high salinity. The Janus SiO 2 -surfactant dispersion, consisting of Janus SiO 2 nanoparticles and the non-ionic surfactant Tween80, is abbreviated as JASN-T80 hereafter. The system can be dispersed and kept stable for one week at a salinity of 30,000 mg/L and a temperature of 85 ℃. The concentration of f nanoparticles and surfactant in the system was optimized at 0.02 wt% Janus SiO 2 nanoparticles + 0.04 wt% Tween80 based on the particle size. An assessment was conducted to measure the system's capacity to decrease interfacial tension and alternate wettability. The interfacial tension between oil and water was reduced to 1.21 mN/m. The JASN-T80 system demonstrates a notable capacity to change wettability by decreasing the contact angle of water on an oil-wet rock surface from 100.6° to 70.5°. The combination of nanoparticle and surfactant leads to a synergistic effect, resulting in an imbibition recovery of 44.28 % for ultra-low permeability core. This work provides a novel concept for the advancement and utilization of nanofluid imbibition system for unconventional reservoir.
研究领域:
石油工程
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 2
·
IF 1.64
Zhenjiang Yu,Xuyang Liu,Fangbo Zhao,Xiaoyang Liang,Yu Tian
A novel low-cost SiO 2 /Polyvinylchloride (PVC) membrane with different nano-SiO 2 particles loading (0–4 wt %) was prepared by the phase-inversion process. The optimum nano-SiO 2 dosage was determined as 1.5 wt % based on the casting solution compositions, the membranes' mechanical properties and hydrophilicities, the pure water fluxes, microstructures, and absorption of protein. Compared with the bare membrane, the membrane with 1.5 wt % nano-SiO 2 addition presented better capabilities against the protein absorption and bacterial attachment, better antifouling performance, and higher flux recovery ratio in filtration of the supernatant liquor which collected from a secondary sedimentation tank in a municipal wastewater plant. The SiO 2 /PVC membranes have applicable potential in the municipal wastewater treatment for their low price, good antifouling performance and high removal efficiencies of SS (over 97.2%), COD (up to 82.9%) and total bacteria (more than 93.6%). © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41267.
研究领域:
环境科学
·
材料科学
·
水处理工程
✓ 已验证
DOI
高影响因子
Biomaterials Science
·
2020
·Vol. 9
·期 5
·1795-1804
·
IF 6.183
Dan-Lei Yang,Ya-Nan Cui,Qian Sun,Mei Liu,Hao Niu,Jie-Xin Wang
The accumulation of bacteria at the margin of dental resin composites is the main reason for secondary caries, which may further cause failure of prosthodontics. Therefore, antibacterial activity is highly required. However, the addition of antibacterial agents or fillers weakens the mechanical or aesthetic properties of composites. In this work, regular-shaped SiO2–ZnO complex clusters (CCs) constructed by spray-drying technology can enhance the antibacterial activity while maintaining the mechanical and aesthetic properties of dental resin composites. The results show that the regular shape and closely packed structure of nanoparticle clusters were not corrupted by the introduction of ZnO particles. As compared to resin composites filled with SiO2 nanoparticle clusters, the comprehensive performances of composites containing SiO2–ZnO CCs were further improved, and the composites filled with 70 wt% Si66Zn4 (CCs composed of 66/70 SiO2 and 4/70 of ZnO) exhibited superior antibacterial capability (antibacterial ratio >99.9%) and acceptable depth of cure, degree of conversion, and biocompatibility. The cooperation of different fillers is highly essential for resin composites to achieve enhanced multifunctional performance.
研究领域:
材料科学
·
口腔医学
·
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）