CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Chunling Li,Yangchao Sun,Meng Cheng,Shuangqing Sun,Songqing Hu
We present a simple approach for the fabrication of a full-thickness super-hydrophobic composite coating consisted of modified TiO 2 nanoparticles and polysiloxane resin. Scanning electron microscope (SEM), fourier transform infrared spectrometer (FTIR), contact angle meter and a simple self-made device were employed to characterize the surface morphologies, chemical compositions, contact angle and sliding angle of the modified TiO 2 nanoparticles and composite coating, respectively. Results show that for both the modified TiO 2 nanoparticles and the as-prepared composite coating the contact angle and sliding angle of is up to 152° and 0°, respectively. In addition, due to the coating design of full-thickness super-hydrophobicity, the composite coating also exhibited good thermal stability, abrasion resistance and corrosion resistance in the thermo-gravimetric analysis (TGA) experiment, abrasion test and immersion test, respectively.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2016
·
IF 2.632
Chunling Wang,Xinxin Sheng,Delong Xie,Xinya Zhang,Huiping Zhang
High performance TiO 2 /polymer nanocomposites with enhanced thermal and excellent UV-shielding properties have been successfully prepared by means of the anatase TiO 2 nanoparticles homogeneously dispersed in the poly (methyl methacrylate/butyl acrylate/methacrylic acid) [P (MMA/BA/MAA)] matrix via a miniemulsion polymerization process. Highly crystalline TiO 2 nanoparticles with 5–8 nm diameter, were synthesized by a non-aqueous process and then modified with γ-Methacryloxypropyltrimethoxysilane (A174) to improve the compatibility with polymer. FTIR, TGA and dispersity tests in monomers/water verify that the A174 is chemically bonded onto the surface of TiO 2 nanoparticles. TEM, SEM and EDS analyses indicate that the TiO 2 nanoparticles are homogeneously dispersed in the polymer matrix. TGA and DSC studies confirm that the thermal properties of the resultant nanocomposites are significantly enhanced with respect to the neat polymer. UV–vis transmission spectra results reveal that the films with TiO 2 nanoparticles has an excellent UV-shielding property, even at 1.5 wt% TiO 2 nanoparticles loading can almost block the UV light below 350 nm while still having a high visible transparency. Therefore, the resultant nanocomposite films could be used as transparent UV-shielding materials.
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
ACS Catalysis
·
2020
·
IF 12.35
Zean Xie,Tingting Yu,Weiyu Song,Jianmei Li,Zhen Zhao,Baijun Liu,Zhenfei Gao,Dong Li
The research and development of abundant, non-toxic, low cost, and high-performance catalysts are urgently required for the production of propylene through propane dehydrogenation (PDH) reaction. Here, the pure TiO2 nanoparticles, obtained through in situ reduction, exhibit excellent catalytic PDH performance. At 600 °C, the initial propane conversion could reach 67%, and the one-pass yield of propylene was 45%. The propane conversion was 21% at 550 °C, and propene selectivity could reach as high as 94%. According to ex/in situ characterization results and Quantum chemical calculations, the dynamic formation and reaction mechanism of active sites were detailedly investigated. The reductive propane and its derivatives can react with surface lattice oxygen of nanosized anatase TiO2 to form oxygen vacancies and coordinatively unsaturated Ti cations (Ticus), which can catalyze PDH with high propene selectivity; the rate of C3H6 formation is in line with the surface oxygen vacancy concentration. Notably, the Ostwald ripening of nanosized TiO2 with high surface energy is crucial to the formation of oxygen vacancies. The agglomeration of nanosized TiO2 at high temperature makes the lattice oxygen atoms mobile and active, which are consumed abruptly and then form oxygen vacancies and Ticus more easily. It is denoted as “mutation reduction”. The surface oxygen vacancy concentration is also influenced by the oxygen migration rate from bulk to surface driven by thermal energy and potential energy (the differences of concentration).
研究领域:
催化化学
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材料科学
·
量子化学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2021
·Vol. 11
·期 12
·3283
·
IF 5.076
Wenbin Yang,Siqi Niu,Yao Wang,Linjun Huang,Shichao Wang,Ketul C. Popat,Matt J. Kipper,Laurence A. Belfiore,Jianguo Tang
In this work, titania (TiO2) nanoparticles modified by Eu(TTA)3Phen complexes (ETP) were prepared by a simple solvothermal method developing a fluorescence Mn7+pollutant sensing system. The characterization results indicate that the ETP cause structural deformation and redshifts of the UV-visible light absorptions of host TiO2nanoparticles. The ETP also reduce the crystallinity and crystallite size of TiO2nanoparticles. Compared with TiO2nanoparticles modified with Eu3+(TiO2-Eu3+), TiO2nanoparticles modified with ETP (TiO2-ETP) exhibit significantly stronger photoluminescence under the excitation of 394 nm. Under UV excitation, TiO2-ETP nanoparticles showed blue and red emission corresponding to TiO2and Eu3+. In addition, as the concentration of ETP in TiO2nanoparticles increases, the PL intensity at 612 nm also increases. When ETP-modified TiO2nanoparticles are added to an aqueous solution containing Mn7+, the fluorescence intensity of both TiO2and ETP decreases. The evolution of the fluorescence intensity ratio (I1/I2) of TiO2and ETP is linearly related to the concentration of Mn7+. The sensitivity of fluorescence intensity to Mn7+concentration enables the design of dual fluorescence ratio solid particle sensors. The method proposed here is simple, accurate, efficient, and not affected by the environmental conditions.
研究领域:
材料科学
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纳米技术
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分析化学
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环境科学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xuemei Wang,Lei Yu,Qi Kang,Lu Chen,Yuchen Jin,Guizheng Zou,Dazhong Shen
Perovskite nanocrystals (NCs) are regarded as potential candidates as electrochemiluminescence (ECL) emitters due to their excellent photoluminescence ability. Herein, we report the ECL behavior of FAPbBr 3 NCs (FA stands for CH(NH 2 ) 2 ) in the aqueous media. It was shown that the ECL of FAPbBr 3 NCs can be obtained by hole-injection to oxidize their reduced states, with the emission peak centered around 534±1 nm and the full width at half maximum of 31±0.5 nm. The annihilation ECL of FAPbBr 3 NCs was 4.3± 0.4 folds enhanced by adding 8% (w/w) CNTs. In the presence of tripropanolamine (TPrA) as the co-reactant, the anodic ECL intensity of FAPbBr 3 was enhanced by a factor of 29 in compared with its annihilation ECL. The ECL intensity of FAPbBr 3 NCs was enhanced 4.8 and 10.6 folds by using TiO 2 nanoparticles (NPs) as the co-reaction accelerator and CNTs as the conductivity enhancer, respectively. In the mixture of TiO 2 NPs @FAPbBr 3 NCs @CNTs, the enhancement in ECL intensity of FAPbBr 3 NCs by a factor of 21.6 was obtained. The anodic ECL of TiO 2 NP @FAPbBr 3 NCs @CNTs/GCE was applied to determination dopamine in the linear range of 0.01–10 μM, with the detection limit of 2.9 nM.
研究领域:
材料科学
·
分析化学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
WEAR
·
2023
·
IF 5
Shifan Li,Conglin Dong,Chengqing Yuan,Xiuqin Bai
Water-lubricated bearings play a vital role in improving the energy efficiency and environmental friendliness of ships. However, under the operating conditions such as start-stop and steering, the ship's stern bearing is often in boundary-lubricated or even dry friction condition due to the weak load-bearing capacity of the water film between the ship's drive shaft and the stern bearing. Therefore, the design of a polymer material with a low coefficient of friction and low vibration amplitude in both water-lubricated and dry friction conditions can greatly improve the stability and safety of the ship's operation. As a common reinforcing filler , TiO 2 nanoparticles have a notable enhancement effect on the tribological properties of lubricants. Therefore, in this paper, the tribological behaviors between UHMWPE matrix reinforced with TiO 2 nanoparticles and zirconia ceramic ball were investigated and the frictional vibrations during the friction process were analyzed. The results showed that TiO 2 generated a ball-bearing effect on the surfaces of the friction pair , which led to a smooth and flat wear surface and reduced the friction and vibration behaviors. The modified composite with 0.9 wt% TiO 2 exhibited the best tribological and vibration-absorbing properties in both water-lubricated and dry friction conditions. This study helps to provide a theoretical foundation for the design of marine water-lubricated bearing materials with excellent wear-resistance and vibration-reduction properties.
研究领域:
材料科学
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船舶工程
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表面工程
✓ 已验证
产品关联
DOI
高影响因子
Coatings
·
2025
·Vol. 15
·期 8
·965
·
IF 2.8
Wei Zhang,Xuran Zhu,Baoan Li,Boyang Hu,Leyu Shen,Yanzong Meng,Haifeng Gao
Commercial hydrophobic membranes encounter severe problems such as membrane wetting and membrane fouling under extreme conditions, which affect membrane separation performance. To enhance the anti-fouling abilities of hydrophobic membranes, a composite membrane with omniphobic characteristics was fabricated successfully in this paper. Titanium dioxide (TiO2) nanoparticles were in-situ grown via the hydrothermal synthesis method, and then fluorosilane with low surface energy was grafted on polyvinylidene fluoride (PVDF) membranes. Subsequently, the morphologies, chemical compositions, wetting properties and structural parameters of composite membranes were characterized systematically. Various contaminants were added to the feed to investigate the anti-fouling and anti-wetting performances of the composite membrane in membrane distillation tests. The results showed that butyl titanate was first hydrolyzed to form titanium hydroxide (Ti(OH)4) and then it was dehydrated to form TiO2in the hydrothermal environment. TiO2crystals continued to grow and formed rough morphology with micro-nano synergistic distribution, which is similar to a “sunflower” disk composed of cubic clusters and nanopillars. Meanwhile, fluorosilane successfully was grafted onto TiO2. The contact angles of deionized water, 0.4 mM sodium dodecyl sulfate (SDS) solution and 0.2%v/vmineral oil emulsion on the composite membrane surface were 167.3°, 162.0° and 158.5°, respectively, endowing the composite membrane with excellent omniphobic features. In direct contact membrane distillation (DCMD) tests, the composite membrane exhibited a relatively stable membrane permeate flux, and the salt rejection rate almost reached 100%. The mixture, consisting of inorganic salts, organic substances, surfactants and oil emulsions, was used as feed. In contrast, the commercial PVDF membrane flux decreased drastically and even dropped to 0 due to the membrane fouling and wetting. As for the pristine PVDF membrane, the membrane surface was covered with pollutants and membrane pores were blocked. Therefore, it was proved that the omniphobic composite membrane possesses outstanding anti-fouling and anti-wetting performance.
研究领域:
膜科学
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材料工程
·
表面化学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2018
·Vol. 18
·期 7
·4445-4456
·
IF 1.354
Liu Min-Chao,Liu Bing,Sun Xiang-Yu,Lin Hui-Chao,Lu Jia-Zheng,Jin Shu-Fang,Yan Si-Qi,Li Yan-Yu,Zhao Ping
The dose-dependent toxicity and low specificity against cancerous cells have restricted the clinical use of daunomycin (DNM). Titanium dioxide (TiO2) has been wildly used as an inorganic photodynamic therapy (PDT) agent and drug carrier. To facilitate the targeted drug delivery
and combined therapy, in the present study, TiO2-coated Fe3O4 nanoparticles (Fe3O4@TiO2 NPs) were employed to load DNM and the drug-loaded Fe3O4@TiO2-DNM Nps exhibited smart pH-controlled releasing
and satisfactory cytotoxicity as well as photocytotocity. The combination of prussian blue staining and fluorescence methods evidenced the effortless cell internalization of the fabricated Fe3O4@TiO2-DNM Nps for the cancer cells. The cell cycle status experiments
indicated that the as-prepared nanospheres arrested the S and G2/M periods of the cancer cell proliferation in the dark, and further induced the apoptosis under the irradiation of ultraviolet light. The cell apoptotic results revealed that the apoptosis induced by the Fe3O4@TiO2-DNM
Nps was in the early stage. The constructed Fe3O4@TiO2-DNM NPs have been endowed with multifunctions that allow them to selectively deliver combinatorial therapeutic payload and exhibit integrated therapeutic effectiveness to tumors.
研究领域:
纳米医学
·
肿瘤学
·
药理学
✓ 已验证
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2013
·Vol. 14
·期 11
·1794-1802
·
IF 0.912
Li Hui,Fu Shiyu,Peng Lincai
Depositing of TiO 2 nanoparticles on cellulose fiber surface has potential technological applications in the field of photocatalysis. With this motivation, multilayers composed of lignosulfonates (LS) and TiO 2 nanoparticles were constructed on cellulose fiber surface via layer-by-layer (LBL) self-assembly technique. X-ray photoelectron spectroscopy (XPS), zeta potential measurement and atomic force microscopy (AFM) were used to characterize the LS/TiO 2 multilayers on cellulose fiber surface. Moreover, the photocatalytic activities of modified cellulose fibers (decomposition of methyl orange and antibacterial test) were investigated. The decomposition efficiency of methyl orange for a (LS/TiO 2 ) 5 multilayer modified cellulose fibers was 74.7 % under 5 h UV irradiation. Photocatalytic decomposition efficiency of methyl orange by LS/TiO 2 multilayer modified cellulose fibers under the same UV irradiation time increased linearly with the number of bilayers. Antibacterial tests results revealed that the cellulose fibers modified with LS/TiO 2 multilayers exhibited excellent antibacterial activity against E.coil . The degree of E.coil growth inhibition for a (LS/TiO 2 ) 5 multilayer modified cellulose fiber reached as high as 93 %. In addition, the effect of LS/TiO 2 multilayers on properties of handsheets made from modified cellulose fibers was also considered. The air permeability of the handsheet prepared from fibers modified with TiO 2 /LS multilayers had 6.1–24.3 % higher compared with that of handsheet prepared from original fibers. The wetting properties measurement results demonstrated that the water contact angle of handsheet oscillated with the increasing number of layers depended on building block which was in the outermost layer.
研究领域:
材料科学
·
环境科学
·
造纸工程
✓ 已验证
产品关联
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Lijuan Zhang,Si Wang,Zhiqin Yuan,Chao Lu
Development of selective cataluminescence (CTL) sensors toward volatile organic compounds (VOCs) is of great importance to environmental analysis and daily chemicals safety. Although some reports for the determination of VOCs based on CTL have been reported, part of them suffered relatively low selectivity because of their high sensitivity toward interferents. In this study, mesoporous TiO 2 nanoparticles have been exploited to detect diethyl ether with the usage of a 440 nm bandpass filter. The proposed method showed high selectivity toward diethyl ether over other VOCs, such as acetaldehyde, acetone, butanone and butanol, etc. Such a high selectivity was majorly attributed to the difference of CTL emission profiles of various VOCs reaction intermediates, and only diethyl ether exhibited strong CTL emission at about 440 nm. Under the optimal conditions, diethyl ether could be detected ranging from 2.0 to 50.0 mM. Furthermore, the practical application of this proposed CTL sensor for diethyl ether was validated with artificial samples and commercial perfumes. In general, such a simple method with high selective detection through controlling detection range could be extended to other analytes.
研究领域:
环境分析
·
化学安全
·
材料科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Chen Zeng,Wei Chaochao,Li Shengjun,Diao Chunli,Li Wei,Kong Wenping,Zhang Zhenlong,Zhang Weifeng
SnO 2 nanosheet-structured films were prepared on a fluorine-doped tin oxide (FTO) substrate using ZnO nanosheet as template. The as-prepared SnO 2 nanosheets contained plenty of nano-voids and were generally vertical to the substrate. TiO 2 nanoparticles were homogeneously deposited into the intervals between the SnO 2 nanosheets to prepare a hierarchically structured SnO 2 /TiO 2 hybrid film. The hybrid films were co-sensitized with CdS and CdSe quantum dots. The sensitized solar cells assembled with the SnO 2 /TiO 2 hybrid film showed much higher photoelectricity conversion efficiency than the cells assembled with pure TiO 2 films. The lifetime of photoinduced electron was also investigated through electrochemical impedance spectroscopy, which showed that the SnO 2 /TiO 2 hybrid film electrode is as long as the TiO 2 film electrode.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2021
·
IF 3.882
Yaqi Zhang,Haoran Zhang,Shiwei Tian,Longfei Zhang,Wei Li,Wei Wang,Xuhuan Yan,Na Han,Xingxiang Zhang
The elimination of dye pollutants from wastewater is a significant concern that has prompted extensive research into the development of highly efficient photocatalytic membranes. A novel method was proposed to prepare photocatalysis-enhanced poly(acrylonitrile-methyl acrylate) (PAN-based) membranes in this study. In detail, the blended membrane containing SiO2@TiO2 nanoparticles with a shell–core structure was first prepared via thermal-induced phase separation. The SiO2 nanoshells were dissolved, and the released TiO2 nanoparticles migrated to the membrane surface during a simple hydrolysis process, which prevents the TiO2 nanoparticles from directly contacting or interacting with the polymer matrix. The hydrogen bonds bind the exposed TiO2 with the PAN membrane surface, resulting in the formation of the TiO2@HPAN hybrid membrane. The photocatalytic efficiency of the TiO2@HPAN membrane doubled compared with that of nonhydrolyzed membranes. In the presence of UV light, the hybrid membrane can degrade 99.8% of methylene blue solution in less than 2 h, compared to only 86.1% for the blended membranes. Further, the TiO2@HPAN membrane showed excellent photocatalytic activity for cationic dyes due to electrostatic attraction. Moreover, the high-flux recovery rate and recycling stability of the TiO2@HPAN membrane lead to an excellent antifouling property. The facile preparation method proposed in this work shows extraordinary potential for the development of highly efficient selective photocatalytic materials for cationic dyes to be used in wastewater treatment applications.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 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）