PROGRESS IN ORGANIC COATINGS
·
2021
·
IF 5.161
Junchao Fu,Haojie Yu,Li Wang,Ruixue Liang,Chuyin Zhang,Meijin Jin
To achieve the high dispersion of SiO 2 nanoparticles in polyurethane acrylate resin, the titanate coupling agent, PN-102, was used as the surface modifier to prepare the modified SiO 2 nanoparticles (Si-PN102-5) with small particle size and good dispersion ability in PUA-6 resin. Accordingly, hydrophilic SiO 2 (Si-380) and hydrophobic SiO 2 (Si-115) were introduced into PUA-6 resin to prepare the corresponding composite coatings, so as to investigate the effects of SiO 2 nanoparticles modified with different surface modifiers on the properties of PUA / SiO 2 composite coatings. The properties of PUA / SiO 2 composite coatings were characterized by the tests of FT-IR, AFM, SEM, DMA, TG and so on. The FT-IR and XPS results show that PN-102 had functionalized the Si-PN102-5 particle surface successfully. The TEM test displays that the particle size of SiO 2 was almost unchanged before and after modification, maintaining at about 20–30 nm. The SEM, DMA and tensile test reveal that Si-PN102-5 not only blocks the interaction and accumulation of nanoparticles, but also enhances the interface interaction with polymer chains through chain entanglement, which endows Si-PN102-5-5% composite coatings with highest mechanical strength among the other prepared coatings, reaching to 11.0 ± 0.1 MPa in tensile strength and 9.4 ± 3.0% in elongation at break. The pencil hardness of the prepared Si-PN102-5-5% composite coating could reach to 5H which is higher than the commercial PUA-6 based coating, and it also displayed good adhesion (4B) and flexibility (3 mm). The TG results show that all of prepared composite coatings display good thermal stability with a decomposition temperature of higher than 250 °C.
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ChemNanoMat
·
2020
·Vol. 7
·期 3
·270-276
·
IF 3.384
Shengrui Zhang,Yang Yu,Shujue Xu,Jun Liu,Mo Liu,He Su,Yajiao Hao,Minjie Li,Sean Xiao-An Zhang
Graphical Au(I)-thiolate nanosheets have been studied as new and efficient water-dispersible UV absorbents. UV screening is very important for the prevention of skin cancer and the elongation of the lifetime of organic/polymeric stuff. To overcome the main problems of poor hydrophilicity and easy leakage of organic UV absorbents, water-dispersible Au(I)-thiolate nanosheets have been studied as a new type of UV absorbents. The results show that Au(I)-thiolate nanosheets have i) very high molar absorption coefficients (>15000 mol/L . cm), ii) comparable or superior photostability to typical organic UV absorbents, and iii) high transparency and nearly no leakage in polymer matrix. So far, no other UV absorbents have been reported to have all the above good performances simultaneously. The transparent and colorless Au(I)-thiolate/polymer thin films can effectively block UV light, and such a material will surely extend the types and the application scenarios of UV absorbents.
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Frontiers in Chemistry
·
2020
·
IF 3.693
Wang Jingwen,Wan Ying,Yue Siyang,Ding Jiaqi,Xie Pengchao,Wang Zongping
UV/persulfate (UV/PS) could effectively degrade algal cells and micro-organic pollutants. This process was firstly applied to remove Microcystis aeruginosa (M. aeruginosa) and 2,4,6-trichlorophenol (TCP) simultaneously in bench scale. Algal cells can be efficiently removed after 120 min reaction accompanied with far quicker removal of the coexisted TCP, which could be totally removed within 5 min in the UV/PS process. Both SO4•- and HO• were responsible for algal cells and TCP degradation, while SO4•- and HO• separately dominated TCP degradation and algal cells removal. Apart from the role of radicals (SO4•- and HO•) for algal cells and TCP degradation, UV also played a role to some extent. Increased PS dose (0–4.5 mM) or UV intensity (2.71–7.82 mW/cm2) could enhance the performance of the UV/PS process in both TCP and algae removal. Although some intracellular organic matters can be released to the outside of algal cells due to the cell lysis, they can be further degraded by UV/PS process, which was inhibited by the presence of TCP. This study suggested the good potential of the UV/PS process in the simultaneous removal of algal cells and micro-organic pollutants.
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PubMed
高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Sellan Premkumar,Dan Liu,Yiming Zhang,Devaraj Nataraj,Subramaniam Ramya,Zhouzheng Jin,Bhekie B. Mamba,Alex T. Kuvarega,Jianzhou Gui
Perovskites are known for their high yield photoluminescence and higher photovoltaic conversion efficiencies. To make them practically useful, the toxicity and stability issues need to be addressed. Herein, we report a less toxic and stable silver bismuth iodide quantum dot system, prepared by a modified ligand assisted reprecipitation (LARP) method. Three types of phase structures such as AgBiI4, Ag2BiI5, and AgBi2I7 were obtained, and their structural and photophysical properties were investigated. By replacing lead (Pb), the toxicity would be reduced considerably and the optical properties persisted for more than six months at ambient conditions. The as-prepared silver bismuth iodide QDs were then used to construct photodetector devices, and the device performances were studied. The constructed photodetector devices have generated the photocurrent values of (AgBi2I7 ∼ 0.12 and 0.32 mA), (Ag2BiI5 ∼ 0.87 and 1.6 μA), and (AgBiI4 ∼ 0.16 and 0.61 mA) at different biasing voltages of 0.1 and 0.2 V, respectively, under visible light irradiation. The AgBi2I7 QD system generated higher photocurrent value and exhibited a better ON/OFF ratio of (Ion /Ioff = 6.5 × 104). The silver bismuth iodide QDs based photodetectors are promising for ultraviolet photodetection.
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WATER RESEARCH
·
2020
·
IF 9.13
Shiqing Zhou,Yangtao Wu,Shumin Zhu,Julong Sun,Lingjun Bu,Dionysios D. Dionysiou
In this study, the potential formation of trichloronitromethane (TCNM) from model organic compounds in ammonia-containing water treated by UV/chlorine process was evaluated. Monochloramine generated from the reaction of chlorine and ammonia can be photolyzed to produce NO 2 − and reactive nitrogen species (RNS), which play important roles in the formation of TCNM during the subsequent chlorination. The results showed that increase of nitrogen to chlorine molar ratio (from 0 to 1.0) and pH (from 6.5 to 8.0) enhanced the formation of TCNM, mainly due to the increased yield of NO 2 − and RNS from the photolyzed monochloramine. The formation of TCNM was interestingly found to be linearly correlated with Hammett constants of the model precursors, which is theoretically related to the rate constants of RNS with model compounds. Enhanced formation of TCNM was also observed during the treatment of natural organic matter by UV/chlorine process in ammonia-containing water. The toxicity assessment showed that TCNM significantly increased the genotoxicity of formed DBPs . Furthermore, the electrophilic substitution reaction of • NO 2 was proved to more likely occur on the ortho and para position of phenol according to the calculation of Gaussian program, and a possible reaction pathway of phenol and • NO 2 was proposed based on the calculated results.
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高影响因子
NANO
·
2020
·
IF 1.566
Xingyuan Ma,Mingrui Zhang
In this present study, graphene oxide (GO) was used as a secondary chain extender and a functional modification assistant to fabricate a three-dimensional nanocomposite (GO-WPU) with waterborne polyurethane (WPU) through the prepolymer dispersion. The tensile strength and elastic modulus of GO-WPU with 0.2 wt.% GO content, compared with those of pure WPU, increase by 170.38% and 50.9%, respectively. Even with a small amount of GO content added, the ultraviolet absorption rate significantly increased, whereas the ultraviolet transmittance decreased significantly. Other properties such as thermal stability and so on were also much enhanced. These results suggested that the functional nanocomposite GO-WPU prepared through the prepolymer dispersion will be an effective fabrication approach and have a wider scope of applications in functional coating materials and film materials.
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ACS Omega
·
2022
·
IF 4.132
Danting Xu,Xia Zhu,Jiakun An,Gaoyu Chen,Jianchun Bao,Xiangxing Xu
As a narrow band semiconductor at room temperature and a metallic material above ∼68 °C, functional VO2 films are widely investigated for smart windows, whereas their potential for ultraviolet–visible–infrared (UV–vis–IR) broad spectral photodetectors has not been efficiently studied. In this report, photodetectors based on VO2–ZnO nanocrystal composite films were prepared by nanocrystal-mist (NC-mist) deposition. An enhanced photodetection switching ratio was achieved covering the ultraviolet to infrared wavelength. Due to the synergetic effect of nanosize, surface, phase transition, percolation threshold, and the band structure of the heterojunction, the transfer and transport of photogenerated carriers modulate the device performance. This study probes new chances of applying VO2-semiconductor-based nanocomposites for broad spectral photodetectors.
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高影响因子
Biomimetics
·
2022
·Vol. 7
·期 4
·162
·
IF 3.743
Hao Zhong,Xiaoxiao Liu,Boxin Yu,Shengzhu Zhou
Antifogging surfaces with unique properties to migrate severe fog formation have gained extensive interest, which is of particular interest for transparent substrates to obtain high visibility and transparency. To date, a large number of strategies including superhydrophilic or superhydrophobic surfaces and titanium dioxide (TiO2)-based composite coatings have been developed based on different mechanisms. Although these surfaces exhibit effective antifogging properties, the rigid nanostructures, cumbersome preparation, and the need for UV light excitation largely limit their widespread applications. Herein, we report a zwitter-wettable antifogging and frost-resisting coating through a fast UV-curable cross-linking of copolymer with benzophenone groups. A series of random copolymers consisting of hydrophilic hydroxyethyl methacrylate (HEA), hydrophobic methyl methacrylate (MMA), and benzophenone-based acrylate units are developed by thermally triggered free-radical polymerization. Upon UV light irradiation, a highly efficient antifogging/frost-resisting coating is covalently bonded on a polycarbonate plate surface, maintaining a light transmission higher than 85%, which was confirmed in both high and low temperature anti-fog tests. Moreover, the wetting behaviors reveal that the antifogging performance exhibited by the zwitter-wettable surface mainly relies on its surface water-adsorbing capability to imbibe condensed water vapor on the surface outmost layer. Notably, the antifogging/frost-resisting behaviors can be well regulated by adjusting the hydrophilic/hydrophobic units, due to the proper balance between the water-adsorption and coating stability. Owing to its simplicity, low-cost preparation and high efficiency, this UV-curable acrylate antifogging coating may find a wide range of applications in various display devices in analytical and detection instruments.Keywords:antifogging;frost-resisting;zwitter-wettable;UV illumination;acrylate coating
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高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Rui Tian,Yue Liu,Chao Wang,Weikun Jiang,Srinivas Janaswamy,Guihua Yang,Xingxiang Ji,Gaojin Lyu
In the present work, hollow and solid lignin nanoparticles (LNPs) were synthesized through a self-assembling process using the organosolv pretreatment of lignin from the eucalyptus and willow byproducts. The SEM , TEM, and zeta potential establish the LNPs of a uniform spherical morphology, and the hollow lignin nanoparticles (HLNPs) display the inner cavity and shell. The polyvinyl alcohol (PVA) nanocomposite films containing the LNPs suggest that the presence of HLNPs results in a “room” like network structure in the films and differs from the solid lignin nanoparticles (SLNPs) induced structural changes. The LNPs inclusion increases the mechanical properties. The films with solid eucalyptus lignin nanoparticles showed excellent tensile strength (132 MPa), while those with hollow eucalyptus lignin nanoparticles resulted in exceptional elongation at break (324%). Hydrophobicity tests revealed that both LNPs incorporation in the PVA film results in a water contact angle of more than 90°. The outcome promises novel opportunities for LNPs in the designing and development of plastic replacement packaging films.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yu Chen,Ning Tang,Weiyan Zhu,Sai Liu,Yong Zhang
Water pollution caused by industrial and natural contaminants has placed a significant burden on environment and human health. The present filtration membranes, however, suffer from a series of issues involving low permeation fluxes and easy fouling issue during long-term water remediation, which seriously restricts their practical applications. Herein, inspired by royal water lily leaf, we construct biomimetic nanonet membranes (BNMs) composed of fractal network and mastoid structures by one-step phase inversion of PVDF/TiO 2 solution using electrospun fibrous membrane as substrates. Benefit from the distinct structures, the BNMs show sub-micro pores, high porosity, and intriguing hydrophilicity, which result in excellent removal performance for 0.3 μm solid particle (efficiency of 99.88%, permeation flux of 3439 L m −2 h −1 ), E. coli (log reduction value = 8.39, permeation flux of 1242 L m −2 h −1 ), and oil-in-water emulsions (efficiency of 99.0%, permeation flux of 8312 L m −2 h −1 ). Importantly, the presence of TiO 2 nanoparticles with UV-driven catalytic activity effectively endows the BNMs with desirable biocidal efficiency (LRV = 8.5) and excellent self-cleaning properties (flux recovery ratio of 98.1%). The synthesis of such membranes may open new avenues in the design of high-performance filtration membranes for remediation of large volumes of wastewater.
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高影响因子
Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 40
·13971-13980
·
IF 6.4
Xiaolong Li,Yulu Tang,Chenyu Wang,Tianzhu Wei,Dongjun Lv,Mingyuan Guo,Yongning Ma,Yuhao Yang
UV–Vis–NIR photodetectors play a crucial role in numerous scientific and commercial applications. It is a great challenge to realize UV–Vis–NIR photodetectors due to the limited photoresponse range of single materials, especially photomultiplication type detectors. In this work, a bulk heterojunction strategy is used to construct Y-TiOPc NP and ZnS NR photosensitive materials (Y-TiOPc:ZnS) with outstanding light absorption in the range of 365 nm to 940 nm. The photodetector based on Y-TiOPc:ZnS (YZ-PD) exhibits an obvious photomultiplication phenomenon and excellent photodetection performance with the maximum external quantum efficiency (EQE) of 2985.5% and a photoresponsivity (R) of 8782 mA W−1 under a low-intensity of 0.01 mW cm−2. Moreover, the photocurrent response curves are all prompt, steady and reproducible during repeated on/off cycles under different exposure wavelengths. Such high performances can be attributed to the complementary absorption spectra of Y-TiOPc NPs and ZnS NRs, the improvement in carrier generation efficiency, separation efficiency, and transmission rate caused by bulk heterojunctions, and the enhancement of external hole tunneling injection efficiency assisted by interfacial trapped electrons. This work demonstrates that the construction of bulk heterojunctions by incorporating UV photosensitive materials and Vis–NIR photosensitive materials has immense potential to prepare highly sensitive broadband photomultiplier detectors, which may inspire further research on high-performance full spectrum photodetectors.
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Materials
·
2023
·Vol. 16
·期 24
·7576
·
IF 3.4
Tianlei Chen,Rong Zhong,Zhengjie Wang
In this study, a hydrophobic, wear-resistant ultraviolet (UV)-curable coating was investigated as an alternative to traditional coatings with low hardness and high susceptibility to scratching. The SiO2nanoparticles were ground and modified using high-energy ball milling, during which the surface energy of nano-SiO2particles rapidly increased as their particle size decreased. Different proportions of modified nano-SiO2particles were added to the coating and cured into a film. The structure of the composite coating was analyzed via infrared spectroscopy, scanning electron microscopy, and X-ray diffraction, which confirmed the successful preparation of the composite coating. The mechanical and optical property tests of the coating were investigated. With a 5% nano-SiO2content, the hardness of the coating reached 5H, whereas the adhesion was poor (2B), and the flexibility was 1. The overall comprehensive performance of the coating was best when the addition amount was 3%. The coating exhibited good hardness, flexibility, and adhesion. The hardness of the coating reached 4H, the adhesion was 4B, the flexibility was 5, the coating haze was 12.38 HZ, and the contact angle was 118°.
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高影响因子
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