PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Kan Tan,Ren Liu,Jing Luo,Ye Zhu,Wei Wei,Xiaoya Liu
In this study, an efficient method of preparing tannic acid functionalized UV-curable carbon nanotube for the reinforcement of acrylated epoxidized soybean oil coating is presented. A photoactive tannic acid (pTA) was prepared by the ring opening reaction of tannic acid (TA) and glycidyl methacrylate (GMA), and then used to non-covalently functionalize carbon nanotubes via π-π interactions to obtain a novel kind of tannic acid functionalized UV-curable carbon nanotube (pTA/MWCNTs). The pTA/MWCNTs was fully characterized and subsequently incorporated into acrylated epoxidized soybean oil (AESO) covalently via UV curing technology. A series of epoxidized soybean oil acrylate composite with different content of pTA/MWCNTs were prepared and the properties of pTA/MWCNTs/AESO composite materials were investigated. Real-time IR and ATR-FTIR were used to monitor the double bond conversion and deep curing of pTA/MWCNTs/AESO coating. The mechanical properties of UV-cured films were evaluated by tensile testing. The results showed that the introduction of pTA/MWCNTs effectively enhanced the physical and mechanical properties of AESO. And when the loading of pTA/MWCNTs is 0.8 wt%, optimal reinforcing effect for AESO matrix was observed with the tensile strength and modulus of the pTA/MWCNTs/AESO composite improved by 109% and 409%, respectively. In great contrast, the introduction of pristine MWCNTs without modification leads to the incomplete curing of AESO and thus a great decrease in the mechanical performance, demonstrating the important role of modification by pTA.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Zhiwei Huang,Robert S. Gurney,Yalun Wang,Wenjiao Han,Tao Wang,Dan Liu
Durability under UV illumination remains a big challenge of TiO2-based superhydrophobic coatings, with the photocatalytic effect causing degradation of low-surface-energy material over time, resulting in the surfaces losing their hydrophobicity. We report surfaces made from tolylene-2,4-diisocyanate (TDI)/TiO2 hybrid networks that demonstrate superhydrophobicity and superior UV durability. Structural and morphological studies reveal that the TDI/TiO2 hybrid networks are composed of TiO2 nanoparticles interconnected with TDI bridges and then encapsulated by a TDI layer. Through controlling the fraction of TDI in the synthesis process, the thickness of the TDI encapsulation layer around the TDI/TiO2 hybrid networks can be varied. When the weight ratio of TDI/TiO2 is 5:1, the superhydrophobicity of the hybrid network surface remains almost unchanged after a month of continuous UV illumination. This hybrid network surface can also clean methylene blue solution through the synergistic effects of cation adsorption and photocatalysis, holding promising potential for applications toward reducing cation pollutions in both liquid and air environments.
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SYNTHETIC METALS
·
2018
·
IF 2.526
Chengqiang Ding,Ziqian Li,Wensheng Tan,Hongda Li,Jianfeng Ma,Zhongping Chen,Yongxin Tao,Yong Qin,Yong Kong
A novel ultraviolet (UV)- and visible-light-active 3D graphene aerogels (3DGA)/Sb 2 WO 6 hybrid photocatalyst was prepared by electrostatic self-assembly (ESSA) method. The photocatalytic activity of the 3DGA/Sb 2 WO 6 hybrid was studied by monitoring the change in the concentration of methyl orange (MO) under UV-light and visible-light irradiation. The results demonstrated that the as-prepared hybrid exhibited significantly enhanced efficiency for the photodegradation of MO in comparison with pure Sb 2 WO 6 . This was ascribed to the efficient separation of the photogenerated electrons (e–) and holes (h + ) with the aid of 3DGA as well as the generated reactive superoxide radical anions (O 2 •–). Moreover, the 3DGA/Sb 2 WO 6 hybrid exhibited high recyclability, because the highly hydrophobic 3DGA in the hybrid was very advantageous to the separation of the hybrid photocatalyst from the MO solutions.
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JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Yu Li,Liang Zhao,Hao Wang,Baohua Li
The novel microencapsulated n -octadecane with TiO 2 -doped silk fibroin (SF) shell was synthesized using a self-assembly method in o/w emulsion. It was confirmed by Fourier transformation infrared spectroscope (FT-IR) and a three-phase contact angle that TiO 2 is successfully modified by SF aqueous solution. The scanning electronic microscope (SEM) and laser scattering particle size distribution analyzer showed that the as-prepared microcapsules have regularly spherical morphology and are about 4–5 μm in average diameter. According to differential scanning calorimeter (DSC), thermogravimetric analyzer (TGA) and ultraviolet visible spectrophotometer (UV–vis) measurements, the TiO 2 -doped microcapsule presents high thermal storage capability, enhanced thermal reliability and stability, and have good UV-shielding property. The TiO 2 -doped microcapsule synthesized in the present study could prove to be path-breaking and lead to further studies in the field of thermal energy storage and UV-shielding applications.
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DRUG DELIVERY
·
2018
·
IF 3.095
Wei Wu,Yong Dai,Han Liu,Ruoyu Cheng,Qing Ni,Tingjun Ye,Wenguo Cui
Osteosarcoma is among the most common malignant bone tumors in human skeletal system. The conventional treatment of osteosarcoma mainly consists of combining neoadjuvant chemotherapy with surgical approach. However, it is crucial to design an artificial implant that possesses excellent biomechanical properties and is capable of sustaining local release of chemotherapeutics. In this study, we envision that the highly efficient combination of gemcitabine (GEM) hydrochloride loaded liposomes with gelatin methacryloyl (GelMA) of in situ photocrosslinkable hydrogel will lead to a multifunctional implant with unique antitumor, mechanical, and biodegradable properties. A sustained controlled release was observed; more specifically, the release of GEM in vitro lasted for 4 days long. Furthermore, its capability in killing MG63 cells was further explored by using the lixivium of GEM-Lip@Gel and GEM-GelMA hydrogel in vitro (composite hydrogel by GEM loaded liposomes blending with GelMA, short for GEM-Lip@Gel), which agreed with the drug release outcome. In addition, these hydrogel showed excellent ability in inhibiting osteosarcoma in vivo by Balb/c mice bearing MG63 cells. Therefore, GEM-loaded lipo-hydrogel certainly has presented itself as a promising strategy for the development of implant in the field of osteosarcoma treatment.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2018
·Vol. 45
·期 2
·757-768
·
IF 1.674
Li Qiang,Wang Lifang,Zhang Li,Xie Hongyong
In this study, rapid degradation of Tetrabromobisphenol A (TBBPA) is explored by using photocatalysis of homo/heterogeneous UV/TiO 2 /potassium persulfate (KPS) systems in alkaline solutions. The experimental results show increasing pH values and decreasing the initial concentration of TBBPA could increase the degradation degree, while the loading amount of TiO 2 and dosage of potassium persulfate have optimum values to increase the degradation degree. TBBPA can be almost completely degraded and 70% of TOC removal efficiency is achieved in the UV/TiO 2 /KPS homo/heterogeneous photocatalysis, much more than the UV/KPS system and UV/TiO 2 system. Roles of radicals \(\text{SO}_{\text{4}}^{ \cdot - }\) and OH · in the photocatalysis systems are discussed based on experimental measurements. The significant TOC removal efficiency and increased bromide ion concentration yield show that there exist synergistic effects in the UV/TiO 2 /KPS homo/heterogeneous photocatalysis, which can mineralize TBBPA into inorganic small molecules relatively thoroughly, thus much less intermediates are formed in the UV/TiO 2 /KPS homo/heterogeneous photocatalysis.
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CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Zhiwu Liu,Yanfeng Ding,Chaocan Zheng Yuan Meng,Jing Tang,Qianping Qiu
Nowadays, exploring new photonic materials that can efficiently convert the invisible light into the visible light have attracted tremendous attention in the catalytic field. Here, we design and prepare a kind of Bi 3+ doped Lu 2 CaGeO 6 phosphor by using the solid-state reaction at 1250 °C in air for 5 h. The structural analysis, which is based mainly on the powder X-ray diffraction (XRD) spectra, shows that the as-prepared Bi 3+ doped Lu 2 CaGeO 6 phosphors belong to a trigonal structure with a space group of R 3 (No. 146). The photoluminescence (PL) results reveal that changing the excitation wavelengths from 240 nm to 340 nm does not change the emission sharp and position of the Bi 3+ doped samples, allowing the maximum emission intensity to keep at 420 nm. Except for the fluorescence, up exposure to the UV light ( e.g. , 254 nm), the Lu 2 CaGeO 6 :Bi 3+ phosphors can also exhibit the Bi 3+ -related blue afterglow luminescence. The longest afterglow duration that corresponds to the 1.5%Bi 3+ doping content in the Lu 2 CaGeO 6 crystal host can last 30 min in the dark. After comparing the Bi 3+ -related blue afterglow band to the band gap of TiO 2 semiconductor that corresponds to the wavelength of 387 nm, it clearly indicates us that the Bi 3+ doped Lu 2 CaGeO 6 phosphors can serve as a continous excitation source for light-sensitive TiO 2 semiconductor for photocatalysis application.
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JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2018
·Vol. 33
·期 7
·1217-1223
·
IF 3.608
Zhirong Zou,Fujian Xu,Yunfei Tian,Xiaoming Jiang,Xiandeng Hou
A miniaturized UV-LED photochemical reactor is proposed for selenium photochemical vapor generation (Photo-CVG). The miniaturized Photo-CVG reactor with a coin size mainly consists of an ultraviolet light-emitting-diode (UV-LED) and a quartz coil with nano-TiO2 coating on its inner wall. It was coupled with an atomic fluorescence spectrometer (AFS) as a sample introduction device for trace selenium determination. The nano-TiO2 coating process, UV-LED wavelength and correlative experimental parameters as well as potential interference were investigated in detail. Under optimized experimental conditions, limits of detection of 0.21 and 0.28 μg L−1 for Se(VI) and Se(IV) were obtained, respectively, with a relative standard deviation (n = 3) of 2.5% and 1.0% at 20 μg L−1. The potential application of this UV-LED Photo-CVG AFS was demonstrated by successfully analyzing a certified reference water sample and several mineral water samples.
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Polymers
·
2018
·Vol. 10
·期 5
·495
·
IF 2.935
Jianhua Ran,Mantang He,Wenbin Li,Deshan Cheng,Xin Wang
This work aims to develop durable functional cotton fabrics by growing zinc oxide (ZnO) nanoparticles on polydopamine (PDA) templates. ZnO nanoparticles were grown on the PDA-templated cotton fabrics by the hydrothermal method at room temperature. The surface morphology, chemical composition, and crystalline structure of the ZnO-coated cotton fabrics were characterized by scanning electron microscope (SEM) with energy dispersive X-ray analysis (EDX), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The ZnO nanoparticles were found to disperse evenly on the surface of cotton fabrics. The ultraviolet (UV) protection factor (UPF) value of the ZnO-coated cotton fabrics was maintained at 122.5, and 99% reduction in bacterial load was observed againstGluconobacter cerinuseven after five cycles of laundering. The PDA was found to be effective in fixing the ZnO seeds tightly on the surface of cotton fabrics, resulting in excellent durability of the coating of ZnO nanoparticles.Keywords:ZnO nanoparticles;polydopamine;cotton fabrics;antimicrobial;UV protection
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PROGRESS IN ORGANIC COATINGS
·
2019
·
IF 3.42
Guanqing Sun,Huiwen Ge,Jing Luo,Ren Liu
It is highly desirable that surface coatings such as kitchen furniture coatings, hospital wall, furniture coatings and many other coatings used in public areas possess antibacterial properties. Although many antibacterial coatings have already been developed and are now commercially available for some time, effective antibacterial properties often require the addition of antibacterial agents in large amount which deteriorate the mechanical properties of the coatings and hence limit their wide-spread uses. Herein we show the fabrication of a robust and wear-resistant polyurethane-based coatings via addition of fluoro-containing quaternary ammonium compounds (QAC F ) modified silica nanoparticles. The nanoparticles are obtained from a classical Stöber process with a thin layer of thiol groups on the particle surface and the QAC F is then further linked to particle surface through double bond and thiol group reaction. QAC F and its modified silica nanoparticles both show high levels of antibacterial properties toward Gram positive and Gram negative bacteria. Addition of the nanoparticles in as less as 10 wt% in the formulation recipe would be enough to produce an antibacterial coating with excellent anti-wear resistance due to the self-migration of the modified silica nanoparticles to the surface layer of the coating. We have used XPS and confocal microscopy to show the particle migration to the top of the coatings enables us to clarify the mechanism. Compared to coatings with added pure antibacterial reagents, our coating shows enhanced anti-wear property at relatively low particle additions.
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Coatings
·
2017
·Vol. 8
·期 1
·9
·
IF 2.175
Xiaoxing Yan,Xingyu Qian,Rong Lu,Tetsuo Miyakoshi
A waterborne ultraviolet (UV)-curing coating was prepared on the surface of wood materials with modification of talcum powder and calcium carbonate (CaCO3). When the waterborne UV-curing coatings on the surface of wood materials (WUVCW) was radiated for 1 min by UV (λ = 365 nm) and dried at 40 °C for 10 min, it showed good hardness, adhesion, and impact strength, with controlling the talcum content of 2.0% and CaCO3content of 1.0%, respectively. When the content of talcum powder was higher than 2%, the mechanical properties and gloss of the WUVCW decreased, and when the talcum powder of WUVCW increase to more than 5%, a matte surface appeared after curing. When CaCO3and talcum powder were present at the same time, the mechanical properties of WUVCW were better than those of only CaCO3or talcum powder.Keywords:modification;interior waterborne coating;UV;mechanical properties;gloss
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PHOTOCHEMISTRY AND PHOTOBIOLOGY
·
2024
·
IF 2.6
Xiuping Lin,Chang-sheng Shao,Shereen M. Elsherbiny,Qing Huang
Astaxanthin (AST) is a xanthophyll carotenoid with strong oxidation resistance, which can effectively scavenge various free radicals and protect organisms from oxidative damage. AST is also known to have prominent anti-aging effects, but the underlying mechanism of AST in anti-radiation aging is largely unknown. In this work, we applied ultraviolet (UV) irradiation to accelerate the aging of Caenorhabditis elegans ( C. elegans ) and treated the nematodes with AST to explore whether and how AST could attenuate the radiation-induced aging effect. Our results showed that AST improved the survival rate of C. elegans , reduced the aging biomarkers, and alleviated the mitochondrial dysfunction caused by the irradiation. Based on the transcriptome sequencing analysis, we identified that the key genes regulated by AST were involved in JNK-MAPK and DAF-16 longevity signaling pathways. Furthermore, we employed jnk-1 and daf-16 mutants and verified the role of the JNK-1/DAF-16 signaling pathway in the anti-aging effect. As such, this study has not only demonstrated that AST can resist the aging process caused by UV-irradiation but also revealed the anti-aging mechanism of AST through JNK-1/DAF-16 activation in C. elegans.
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