POLYMER DEGRADATION AND STABILITY
·
2015
·
IF 3.163
Weiguo Chen,Zongqian Wang,Zhihua Cui,Donghui Pan,Keith Millington
The covalent coupling reaction between the tyrosine residues on silk fibroin and a hydroxyphenyl benzotriazole UV absorber containing a diazonium group caused a decrease in UV–visible transmittance through silk fabric together with yellowing due to the presence of the conjugated azo-benzotriazole chromophore . After exposure to UV irradiation , untreated silk was yellowed due to photooxidation of the aromatic amino acid residues in the fibroin protein, whereas the modified silk concurrently experienced some photoyellowing of the protein, together with photobleaching of the covalently bonded conjugated chromophore. Although application of the UV absorber caused a decrease in tensile strength , modification of silk with a higher amount led to a very low color change and less decrease in tensile strength than untreated silk fabric following UV irradiation.
研究领域:
材料科学
·
生物化学
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DOI
高影响因子
Polymers
·
2017
·Vol. 9
·期 11
·552
·
IF 3.364
Hongping Xiang,Xiaowei Wang,Guanghong Lin,Lu Xi,Yan Yang,Dehua Lei,Haihui Dong,Jiahui Su,Yanyan Cui,Xiaoxuan Liu
A novel UV-curable hyperbranched polyurethane acrylate (FHBPUA) with excellent flexibility is successfully synthesized based on a reaction of hydroxyl terminated hyperbranched polyurethane (regarded as core) with flexible semiadduct urethane monoacrylate (regarded as arms). The structure and property of FHBPUA is firstly analyzed and then utilized as functional additives to ameliorate the UV-curing and mechanical properties of epoxy acrylate resin. The degree of branching of FHBPUA turns out to be 0.82. Its thermal decomposition process consists of three different stages, and the glass transition temperature is around 65 °C. The freestanding FHBPUA film (~30 μm thickness) can be UV-cured within 3 s, and its flexibility is up to 1 mm. With the increase of FHBPUA content to 10 wt %, the UV-curing time of UV1000 film decreases from 6 to 3 s, flexibility strikingly increases from 10 to 1 mm, and adhesive force also improves from 5 to 3 grades, meanwhile its glossiness is not influenced by FHBPUA. In addition, a certain amount of FHBPUA can improve the tensile strength and elongation at break of UV1000 film. This novel FHBPUA can be used not only to develop flexible UV-curable freestanding films but also as functional additives to perfect other UV-curable compositions like coatings, inks and 3D printed parts.Keywords:hyperbranched polyurethane acrylate;UV-curing;flexibility;coatings;reinforcements
研究领域:
材料科学
·
化学工程
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DOI
PubMed
高影响因子
Toxins
·
2022
·Vol. 14
·期 2
·93
·
IF 5.075
Hongmei Liu,Zhihong Xuan,Jin Ye,Jinnan Chen,Meng Wang,Stephan Freitag,Rudolf Krska,Zehuan Liu,Li Li,Yu Wu,Songxue Wang
An immunoaffinity magnetic beads (IMBs) based automatic pretreatment method was developed for the quantitative analysis of deoxynivalenol (DON) by ultra-performance liquid chromatography and ultraviolet detector (UPLC-UV). First, N-hydroxysuccinimide-terminated magnetic beads (NHS-MBs) with good magnetic responsivity and dispersibility were synthesized and characterized by optical microscopy, scanning electron microscopy (SEM), and laser diffraction-based particle size analyzer. Then, the amino groups of anti-DON monoclonal antibody (mAb) and the NHS groups of NHS-MBs were linked by covalent bonds to prepare IMB, without any activation reagent. The essential factors affecting the binding and elution of DON were meticulously tuned. Under optimal conditions, DON could be extracted from a real sample and eluted from IMB by water, enabling environmentally friendly and green analysis. Hence, there was no need for dilution or evaporation prior to UPLC-UV analysis. DON in 20 samples could be purified and concentrated within 30 min by the mycotoxin automated purification instrument (MAPI), allowing for automated, green, high-throughput and simple clean-up. Recoveries at four distinct spiking levels in corn and wheat ranged from 92.0% to 109.5% with good relative standard deviations (RSD, 2.1–7.0%). Comparing the test results of IAC and IMB in commercial samples demonstrated the reliability and superiority of IMB for quantitatively analyzing massive samples.Keywords:deoxynivalenol;immunoaffinity magnetic beads;automatic;UPLC-UVKey Contribution:An immunoaffinity magnetic beads-based automatic pretreatment method was developed for the quantitative analysis of deoxynivalenol by UPLC-UV, with water used as the solvent for extraction and elution.
研究领域:
分析化学
·
毒理学
·
食品科学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 8
·期 5
·2481-2489
·
IF 10.733
Qingqing Rao,Jiawen Zhang,Xiaoli Zhan,Fengqiu Chen,Qinghua Zhang
Smart surfaces with special wettability properties have attracted remarkable attention due to the potential for extensive applications in liquid manipulation techniques. However, the challenges in lubricant-wastage and the programmable droplet sliding pathway remain. Here, a silicon oil-infused porous slippery surface was fabricated with UV-responsive controllable wettability (UVRS), and then, the UVRS was integrated with a non-UV-responsive slippery surface (NUVRS) to form composite UV-responsive surfaces (CUVRSs). Due to the conformational transformation of the azobenzene groups under UV light irradiation, the lubricant lost from the surface could be self-replenished, eventually rebuilding a new lubricant layer to re-form the slippery surface. Besides, the color of the exposed surface changed simultaneously, thus providing a new way to monitor the wettability changes and droplet sliding route. By adjusting the design of the “cutting patterns” on NUVRSs and the pattern of the UV masks, the droplet-guiding channels could be programmed orderly. In addition, these programmable droplet pathways could not only be used for point-to-point liquid transportation but also for constructing tailored microfluidic- and micro-reactors. These findings provide a novel way to rebuild smart slippery surfaces and design programmable droplet sliding pathways, thus advancing the application of intelligent slippery surfaces in liquid manipulation, microfluidics and micro-reactor settings.
研究领域:
材料科学
·
表面工程
·
微流控技术
·
化学工程
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Yin Xu,Ziyan Lin,Yan Wang,Hui Zhang
As one of non-nutritive and commonly used artificial sweeteners, sucralose (SUC) is now ubiquitous and detected in aquatic environments, which has already been recognized as an emerging contaminant. The mineralization of SUC in aqueous media by UV/peroxymonosulfate (PMS) process is investigated herein. Influences of several operating parameters, including pH, oxidant concentration and initial SUC concentration, on SUC mineralization were evaluated. Changing the pH from 3 to 9 had a weak effect on the mineralization of SUC, but the mineralization efficiency dropped sharply at pH 11. Nearly complete mineralization (>95%) of SUC was achieved after 60 min treatment with 3.780 mM oxidant at neutral pH. Both hydroxyl and sulfate radicals were demonstrated to participate in the oxidation of SUC according to EPR analysis. Under neutral pH condition, the presence of inorganic anion such as Cl − , NO 3 − or NO 2 − exhibited a varied inhibition effect on the mineralization efficiency with the order being NO 2 − > NO 3 − > Cl − . Activated sludge inhibition tests and Daphnia magna acute immobilization tests were performed to evaluate the detoxification efficiency of the UV/PMS process. The by-products formed were identified using LC–MS technique and a possible pathway of SUC degradation was proposed. In summary, the obtained result provides meaningful information on the application of UV/PMS process for the mineralization of SUC or other artificial sweeteners.
研究领域:
环境科学
·
水处理工程
·
化学工程
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DOI
高影响因子
Journal of Chemistry
·
2016
·Vol. 2016
·期 1
·6065019
·
IF 0.996
Shao-long Yang,Zhi-tao Han,Jing-ming Dong,Zi-sheng Zheng,Xin-xiang Pan
A wet de-NO x technique based on an UV-enhanced NaClO oxidation process was investigated for simulated flue gas of a diesel engine using a bench-scale reaction chamber. The effects of UV irradiation time, initial pH value, and available chlorine concentration of NaClO solution were studied, respectively. The results showed that when the UV irradiation time was 17.5 min and the initial pH value of NaClO solution was 6, NO removal efficiency of UV/NaClO solution was increased by 19.6% compared with that of NaClO solution. Meanwhile, when the available chlorine concentration of NaClO solution decreased from 0.1 wt% to 0.05 wt%, the enhancement in NO removal efficiency of UV/NaClO solution increased from 19.6% to 24%, compared with that of NaClO solution. The reaction pathways of NaClO solution photolysis and NO removal by UV/NaClO process were preliminarily discussed. The results suggested that HOCl might be the most active species that released many UV-induced photooxidants through photolysis reactions, which played an important role in NO removal process.
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DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 23
·4588
·
IF 5
Qianhui Yu,Zengshuai Zhang,Pengyun Tan,Jiahao Zhou,Xiaojing Ma,Yingqing Shao,Shuangying Wei,Zhenhua Gao
In recent years, superhydrophobic coatings with self-cleaning abilities have attracted considerable attention. In this study, we introduced hydroxyl-terminated polydimethylsiloxane (OH−PDMS) into castor-oil-based waterborne polyurethanes and synthesized silicone-modified castor-oil-based UV-curable waterborne polyurethanes (SCWPU). Further, we identified the optimal amount of OH−PDMS to be added and introduced different amounts of micro- and nanoscale heptadecafluorodecyltrimethoxysilane-modified SiO2particles (FAS−SiO2) to prepare rough-surface SCWPU coatings with dense micro- and nanostructures, thus realizing waterborne superhydrophobic coatings. The results show that when the OH−PDMS content was 11 wt% and the total addition of FAS−SiO2particles was 50% (with a 1:1:1 ratio of 100 nm, 1 µm, and 10 nm particles), the coatings exhibited a self-cleaning ability and superhydrophobicity with a contact angle of (152.36 ± 2.29)° and a roll-off angle of (4.9 ± 1.0)°. This castor-oil-based waterborne superhydrophobic coating has great potential for waterproofing, anti-fouling, anti-corrosion, and other applications.Keywords:superhydrophobic coating;self-cleaning;castor oil;silicone modification;UV curing;waterborne polyurethane coating
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DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 34
·期 12
·2310407
·
IF 19
Yipeng Song,Hongwei Yu,Bingxuan Li,Xiaoqi Li,Yang Zhou,Yanqiang Li,Chao He,Ge Zhang,Junhua Luo,Sangen Zhao
Phase matching is indispensable for high efficiency of second-order nonlinear optical (NLO) crystals. Thousands of these crystals rely on birefringence phase matching, whereas only a few of them are quasi-phase matching without the restriction of birefringence. Herein, using oriented seeds inch-sized LiNH 4 SO 4 (LAS) single crystals are successfully grown. LAS is NLO-active with a very short deep-UV absorption edge of 171 nm and high laser damage threshold up to 1.47 GW cm −2 at 1064 nm, 10 ns, but its birefringence is merely 0.0078@532 nm, which is too small to realize birefringence phase matching in deep-UV region. Fortunately, P − E hysteresis loop, variable-temperature NLO tests, and ferroelectric domain observations confirm that LAS is ferroelectric. Furthermore, LAS exhibits small refractive index dispersion resulting in a relatively long periodic length of 1.4 µm and its single domain structure can be easily obtained by electrical poling. These attributes make LAS a scarce NLO candidate for deep-UV quasi-phase matching. This work highlights the longly overlooked potential of sulfates and provides new opportunities for deep-UV NLO materials.
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DOI
高影响因子
Nanoscale Research Letters
·
2020
·Vol. 15
·期 1
·1-8
·
IF 3.578
Wang Hsiang-Chun,Hong Yuehua,Chen Zhangwei,Lao Changshi,Lu Youming,Yang Zhichao,Zhu Youhua,Liu Xinke
To further improve the performance of all-inkjet-printing ZnO UV photodetector and maintain the advantages of inkjet printing technology, the inkjet printing Ag nanoparticles (NPs) were deposited on the inkjet printing ZnO UV photodetector for the first time. The inkjet printing Ag NPs can passivate the surface defects of ZnO and work as surface plasmons from the characterization of photoluminescence (PL), X-ray photoelectron spectroscopy (XPS), and finite difference time domain method (FDTD) simulation. The normalized detectivity ( D * ) of the Ag NP-modified detector reaches to 1.45 × 10 10 Jones at 0.715 mW incident light power, which is higher than that of 5.72 × 10 9 Jones of the bare ZnO photodetector. The power-law relationship between the photocurrent and the incident light power of the Ag NP-modified ZnO detector is I pc ∝ P 2.34 , which means the photocurrent is highly sensitive to the change of incident light power.
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yu Zhou,Zuyi Zhao,Zhaoxia Liu,Hongxiang Chen,Hongye Yan,Junjie Tan,Fan Li
In order to improve the curing efficiency and reduce energy consumption of silicone pressure-sensitive adhesive (SiPSA), a kind of UV-curable SiPSA based on thiol-ene reaction was prepared with methyl vinyl MQ resin as hard segment, methyl vinyl silicone rubber (110-2S) as soft segment and mercaptyl silicone oil as cross-linker. The UV-cured SiPSA exhibited excellent thermal stability and water resistance. Its physical features such as chemical composition, cross-linking extent and dispersion of MQ resin in silicone rubber were directly related to the vinyl content in MQ resin, the thiol/ene ratio and the resin/rubber ratio, which further affected mechanical properties and adhesive properties of SiPSA. With the vinyl content in MQ resin of 56 mmol/100 g, the thiol/ene molar ratio of 0.8 and the resin/rubber mass ratio of 1.4, the UV-cured SiPSA-B1.4–0.8 had better mechanical properties, moreover it had higher tensile shear strength of >2.0 MPa and showed interface failure on the surface of substrates, indicating that it had great potential applications as PSA.
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产品关联
DOI
高影响因子
Advanced Electronic Materials
·
2023
·Vol. 9
·期 12
·2300469
·
IF 6.2
Hao Dong,Wenxin Liu,Yi Li,Xing Chen,Di Wang
Metal oxide materials are widely adopted in UV sensing due to their advantages of reliability, stability, and high sensitivity. However, the fabrication of metal oxide films on flexible substrates using micro/nano printing techniques still poses challenges. Notably, inks containing oxide nanoparticles often lead to nozzle clogging during the printing process. In addition, methods relying on precursor solutions typically require high post-processing temperatures that conventional flexible substrates cannot withstand. In this study, a novel precursor ink based on zinc amine hydroxide complexes is proposed, enabling post-processing at a low temperature of 250 °C. Through a fully printed approach, a wearable UV sensor based on a zinc oxide nanofilm on a flexible substrate is successfully fabricated. The sensor exhibits outstanding sensitivity and rapid response characteristics. By incorporating silver nanoparticles into the ink, the baseline resistance of the sensitive material is adjusted. Furthermore, a smart patch utilizing the NFC communication protocol is developed, allowing for wireless, passive, and wearable UV detection. In this study, a process paradigm for fabricating metal oxide films on flexible substrates using micro/nano printing techniques is introduced, showcasing significant potential in the field of micro/nano sensor fabrication.
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuanming Chen,Shaorong Liang,Wei He,Shouxu Wang,Chong Wang,Zhuoming Du,Yongjie Du,Weiguo Yang,Binyun Liu,Yan Hong
A simple and chromium-free method for the metallization on engineering plastic polyamide-6 (PA6) by UV irradiation is proposed in this article. The surface graft polymers with specific adsorption activity are developed through one-step UV exposure operation, which captures Pd 2+ in the activation process. The chemisorption of Pd 2+ is further reduced into catalytic Pd 0 to enable the substrate with catalytic nucleus for conventional copper electroless deposition (ELD). The grafting layer and the deposited copper coating are characterized by Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, contact angle measurements, scanning electron microscopy, and X-ray diffraction. The results indicate that successful grafting occurs on PA6 after UV excitation. In addition, the as-deposited copper layer shows excellent conductive performance and high adhesion with the PA6 substrate. It’s expected that this emerging and feasible approach would have broad prospects for the metallization of plastic and offer significant value in the plating industry.
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）