Frontiers of Environmental Science & Engineering
·
2020
·Vol. 15
·期 5
·1-12
·
IF 4.053
Li Xinzheng,Li Zhiming,Xing Zhihui,Song Zhimin,Ye Bei,Wang Zhengming,Wu Qianyuan
In this work, LED-based photocatalysis using mixed rutile and anatase phase TiO 2 (P25) as the photocatalyst could effectively remove 5-chloro-2-methyl-4-isothiazolin-3-one (CMIT) and methylisothiazolone (MIT) simultaneously, with removal efficiencies above 80% within 20 min. The photocatalytic degradation of both CMIT and MIT could be modeled using a pseudo-first-order rate equation. The photocatalytic degradation rates of CMIT and MIT under LED280 illumination were higher than under LED310 or LED360 illumination. At concentrations below 100 mg/L, the degradation rate of CMIT and MIT under LED illumination significantly increased with increasing catalyst dosage. Additionally, the effects of the chloride ion concentration, alkalinity and dissolved organic matter on the photocatalytic degradation reaction were also investigated. The ·OH free radicals were determined to play the primary role in the photocatalytic degradation reaction, with a degradation contribution of >95%. The photocatalytic degradation of CMIT and MIT mainly occurred via oxidation, hydrolysis, and chain growth reactions. Finally, the possible photocatalytic degradation pathways of CMIT and MIT over LED/P25 are proposed.
研究领域:
环境科学
·
化学工程
·
生物学
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Xin Yu,Jinlan Li,Jianing Zhang,Jing Jin,Yanxiong Pan,Xiangling Ji,Wei Jiang
Shape transformation of polymer particles is generally a nonequilibrium dynamics process. Controlling the shape transformation of polymers is increasingly attractive and challenging for scientists due to their extensive use in drug delivery and cancer therapy. Herein, we investigated the UV-triggered shape transformation pathway of polymeric vesicles assembled from Polystyrene-block-poly(4-vinylpyridine) and 4-hydroxyazobenzene (PS-b-P4VP(Azo–OH)) and the direct assembly pathway of UV-irradiated PS-b-P4VP(Azo–OH) homogeneous solution. In the shape transformation process, well-assembled vesicles can be transformed into toroid, cylindrical, rod-like, and spherical micelles. In the direct assembly pathway, rod-like and spherical micelles can be obtained. Interestingly, the toroid micelles can be obtained only from the UV-triggered shape transformation pathway. Contrasting the two pathways reveals the pathway dependence of PS-b-P4VP(Azo–OH) assembly, suggesting that the final assembly morphology is determined by the initial state and dynamic process. The speed of UV-triggered shape transformation and the final morphology of assemblies can be tuned easily by adjusting the UV illuminance, time, and content of Azo–OH addition. Moreover, the light-responsive polymeric vesicles can be used as drug carriers and have the potential to release drugs precisely.
研究领域:
材料科学
·
生物医学工程
·
药剂学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
·
2019
·
IF 1.433
Sangmin Lee,Jaebum Son,Dong Geon Kim,Joonbum Choi,Yong Kyun Kim
Production of plastic scintillators using 3D printing technology has gained increased interest, and related researches are being published. However, research results show that the performance of plastic scintillators, such as light yield or decay time, is still poor compared to that of commercial products. In order to improve the scintillator performance, a UV-curable solution was prepared by applying ADS148BE, a new wavelength shifter, from which a plastic scintillator was fabricated using a UV LED curing machine. The maximum emission wavelength of the prepared scintillator occurred at 429 nm. The transmittance at peak emission was 49%. The scintillation efficiency was measured to be 43% of BC408 (Saint-Gobain Crystals). The light yield was determined to be 35% of BC408. It is about 1.9 times better than that of a scintillator fabricated by a UV lamp of a previously published paper [12]. The light output was estimated as 33.7% of BC408. The decay time was approximately 2.46 ns. This is the relative value measured after setting the decay time of the reference scintillator to match the manufacturer’s data. Compared to the UV-curable plastic scintillator of previously reported studies, we have improved the overall performance of our sample and will be able to make precise shapes with a 3D printer.
研究领域:
材料科学
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核技术
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
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°.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 110
·90578-90587
·
IF 3.84
Xiaohui Li,Kaiqiang Zhang,Yunhui Zhao,Kongying Zhu,Xiaoyan Yuan
UV-curable films composed of thiol-terminated fluorosilicone methacrylate triblock copolymers (PDMS-b-(PFMA-SH)2), thiol-functionalized PDMS (PDMS-SH) and octavinyl POSS (OVPOSS) were developed for the purpose of icephobic application. The PDMS-b-(PFMA-SH)2 copolymers were firstly synthesized via reversible addition–fragmentation chain transfer polymerization of dodecafluoroheptyl methacrylate (12FMA) or 2-perfluorooctylethyl methacrylate (17FMA), and followed by thiol-modification of the end groups. The results of differential scanning calorimetry and X-ray diffraction revealed the presence of perfluoroalkyl side groups in P17FMA as presented in the crystalline structure. These endowed the P17FMA-containing films with higher receding contact angles (100.2–113.5°) as compared with the P12FMA-containing films. In icephobicity investigations of the prepared films, it was found that the rebound of the impacting droplet was influenced by the receding contact angle, surface roughness, and temperature of the film surface. Water droplets could rebound from the horizontal and tilted (30° and 45°) P17FMA-containing film surfaces down to −15 °C, allowing surface dewetting before the water droplets froze, while the droplets adhered to the P12FMA-containing film surfaces. Moreover, the ice shear strengths of all the prepared film surfaces were lower than 210 kPa, only about 15% of the value on the bare aluminum surface. Therefore, P17FMA-containing UV-curable films could be a potential candidate for icephobic applications.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Li Dong,Xiangdong Liu,Zhengrong Xiong,Dekun Sheng,Yan Zhou,Changhong Lin,Yuming Yang
Herein, PVDF membranes with excellent UV-absorbing property were first synthesized through grafting the polymerizable low-molecular-weight organic UV-absorber 2-hydroxy-4-(3-methacryloxy-2-hydroxylpropoxy) benzophenone (BPMA) onto α-bromoester-functionalized PVDF membranes via the surface-initiated activator generated by electron transfer atom transfer radical polymerization (SI-AGET ATRP). The surface initiators were immobilized by the reaction between 2-bromoisobutyryl bromide (BIBB) and the hydroxylated PVDF membranes. PVDF-g-PBPMA membranes with different grafting densities were obtained by tuning the polymerization time and the modified membranes were characterized by 1 H-NMR, FT-IR, XPS, SEM, UV–vis Spectrophotometer, TGA and DSC. The experimental results indicated that PBPMA chains were successfully introduced onto PVDF membranes. Most importantly, the PVDF-g-PBPMA membranes exhibited outstanding UV-shielding property. UV–vis transmittance spectra showed that most UV light below 360 nm could be absorbed by PVDF-g-PBPMA membranes and the whole UV light region (200–400 nm) can be blocked with the reaction time increased.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Xiaoqiang Zheng,Ai-min Pang,Yu Wang,Wei Wang,Yongping Bai
Novel UV-curable methacrylate functionalized fluorosilicone resin (MAFSR) and sulfhydryl functionalized fluorosilicone resin (SFSR) were synthesized respectively. The molecular structure, UV curing process, thermal properties and surface properties were studied. Further application as protective coatings in the field of printed circuit board (PCB) was explored. Results show that the MAFSR with more than 30 wt % SFSR possess a high carbon-carbon double bonds conversion above 95 % after 15 s UV exposure. Besides, the surface energy of the coatings is as low as 11.5 mN/m, showing excellent hydrophobicity . The XPS results further reveal that the migration and orientation of the fluorine groups to the surface is an intrinsic reason for low surface energy. In addition, the coatings also demonstrate excellent heat resistance and solvent resistance . This study shows that UV-curable fluorosilicone resins are presumably promising special protective coatings for PCB.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
WATER RESEARCH
·
2024
·
IF 11.4
Qi Lu,Qi Han,Hongnan Liu,Li Feng,Yongze Liu,Ziwen Du,Liqiu Zhang
Dissolved black carbon (DBC) released from biochar, is an essential group in the dissolved organic matter (DOM) pool and is widely distributed in aquatic environments. In various advanced oxidation processes (AOPs), DBC exhibits enhanced free radical scavenging compared to typical DOM, attributed to its smaller molecular weight and more compacted aromatic structure; however, the molecular-level transformations of DBC in different AOPs , such as UV/H 2 O 2 , UV/PDS, and UV/Chlorine, remain unclear. This study employed a DBC derived from wheat biochar for experimentation. Characterization involved ultraviolet-visible (UV–Vis) spectroscopy and fluorescence excitation-emission-matrix (EEM) spectroscopy, revealing the transformation of DBC through diminished SUVA 254 values and reduced intensity of three-dimensional fluorescence peaks. Further insights into the transformation were gained through Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS). After each UV-AOP treatment, a conspicuous augmentation in the oxygen content of DBC was observed. The detailed oxygenation processes were elucidated through mass difference analysis, based on 23 types of typical reactions. Results indicated that oxygenation reactions were most frequently detected in all three UV-AOP treatments. Specifically, the hydroxylation (+O) predominated in UV/H 2 O 2 , while the di-hydroxylation (+2O) prevailed in UV/PDS. UV/Chlorine treatments commonly exhibited tri-hydroxylation (+3O), with the identification of 1194 Cl-BPs of unknown structures. This study contributes to a comprehensive understanding of the molecular transformations of DBC induced by various free radicals in different UV-AOP processes, leading to a better understanding of the different fates of DBC in UV-AOP processes. In addition, the identification of DBC as a precursor of by-products will also contribute to the understanding of how to inhibit the generation of by-products.
研究领域:
环境科学
·
化学工程
·
分析化学
·
水处理
✓ 已验证
DOI
PubMed
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Jiahui Chen,Yanyan Cui,Zhu Ding,Honggang Jiang,Zonglin He,Lina Song,Baohua Liu
Poly (propylene carbonate) diol with double-bonds on the side chains (PPCAGE) was synthesized form CO 2 , propylene oxide (PO), polyether diol (PPG) and allyl glycidyl ether (AGE). Then, three kinds of CO 2 based polyurethane oligomers (PPCAGE-PU) (PPCAGE-PUA, PPCAGE-PUB and PPCAGE-IPDI, respectively) with different contents of double bond were prepared through the reaction of PPCAGE, isophorone diisocyanate (IPDI) and hydroxyethyl acrylate (HEA). The content of -NCO was adjusted by varying the ratio of -NCO terminated prepolymer and HEA. Acrylate copolymer with side double bonds and hydroxyl groups (GMA-PSA) was synthesized by the ring-opening reaction of glycidyl methacrylate (GMA) and acrylate copolymer (PSA) containing -COOH and -OH. CO 2 based UV-induced peelable adhesive was prepared by mixing PPCAGE-PU, GMA-PSA, active diluent and photoinitiator. The structure of PPCAGE was confirmed by Fourier transform infrared (FT-IR) and nuclear magnetic resonance ( 1 H NMR). The reaction of PPCAGE-PUB and GMA-PSA was monitored by FT-IR, companied by the titration of -NCO and epoxide. The molecular weight of PSA and GMA-PSA was determined by gel permeation chromatography (GPC). The surface morphology of the adhesive was observed by scanning electron microscopy (SEM). The viscoelasticity of adhesive was measured by real-time rheology. The 180° peel strength , micro-surface morphology, gel content, unsaturation conversion and glass transition temperature of UV-induced peelable adhesive were characterized. The results showed that the peel strength of adhesive was 17.82 N/25 mm before UV curing. After UV curing, the surface morphology changed from smooth to rough, the peel strength decreased to 0.08 N/25 mm and the modulus of the PSA increased due to the cross-linking. DSC results showed that the glass transition temperature increased after UV curing.
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2019
·Vol. 16
·期 5
·1305-1316
·
IF 1.584
Shi Hongyi,Liu Weiqu,Liu Chunhua,He Sha,Jiang Chi,Wang Zhengfang
Monomethacryloyloxy-terminated fluorinated oligomers (PPFOMA-GMA and PHFBMA-GMA) and methyl allyl alcohol polyoxyethylene ether-modified epoxy resin (HPEGEA) were successfully synthesized and used as reactive additives and emulsifier for epoxy acrylate, respectively. FTIR, 1 H NMR, and GPC were used to characterize the structures of PPFOMA-GMA, PHFBMA-GMA, and HPEGEA. The influence of the concentrations of PPFOMA-GMA and PHFBMA-GMA on the properties of waterborne epoxy acrylate (WEA) resin coatings was investigated. The surface energy of waterborne epoxy acrylate coating was decreased from 38.20 mN/m to 15.31 mN/m by adding just 0.21 wt% PPFOMA-GMA, indicating its high effectiveness in improving the hydrophobic properties of the surface. The surface compositions of the WEA resin coatings (with 0.85 wt% PPFOMA-GMA or 0.85 wt% PHFBMA-GMA) were characterized by XPS. The XPS results confirmed the quantitative enrichment of fluorine atoms on the surface. What is more, the physical properties of waterborne epoxy acrylate coatings prepared with different concentrations of fluorinated reactive additive, such as optical transmittance, adhesion (on glass, PET, and tinplate), pencil hardness, water absorption, and thermal properties, were also analyzed in detail. Hence, the waterborne epoxy acrylate coatings prepared with low concentrations of reactive additives were economical and have potential for large-scale industrial applications.
研究领域:
高分子化学
·
材料科学
·
表面工程
✓ 已验证
DOI
高影响因子
Frontiers in Environmental Science
·
2021
·
IF 4.581
You Wen-Dan,Ye Pu,Yang Bin,Luo Xin,Fang Jie,Mai Zi-Tian,Sun Jian-Liang
Benzodiazepines are one group of psychoactive drugs widely detected in water environments, and their persistence during conventional wastewater treatment has raised great concerns. Here we investigated the degradation of 17 benzodiazepines in water by UV/H2O2 treatment. The results showed that the UV/H2O2 treatment significantly increased the degradation of 17 benzodiazepines in phosphate buffer solutions at pH 7.0. This can be attributed to the high reactivity of hydroxyl radicals (·OH) towards benzodiazepines with second-order rate constants of 3.48 × 109 M−1 s−1–2.44 × 1010 M−1 s−1. The degradation of alprazolam, a typical benzodiazepine, during the UV/H2O2 treatment was increased with the increasing H2O2 dosage. The solution pH influenced the alprazolam degradation significantly, with the highest degradation at pH 7.0. Water matrix, such as anions (Cl−, HCO3−, NO3−) and humic acid, decreased the degradation of alprazolam by UV/H2O2 treatment. Based on the degradation products identified using quadrupole time-of-flight mass spectrometer, the degradation mechanisms of alprazolam by UV/H2O2 treatment were proposed, and hydroxylation induced by ·OH was the main reaction pathway. The degradation of 17 benzodiazepines by UV/H2O2 treatment in wastewater treatment plant effluent and river water was lower than that in phosphate buffer solutions. The results showed that the benzodiazepine psychoactive drugs in natural water can be effectively removed by the UV/H2O2 treatment.
研究领域:
环境科学
·
药理学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FUSION ENERGY
·
2025
·Vol. 44
·期 1
·1-14
·
IF 2.1
Hu Xin,Tan Guangfan,Cai Liang,Yi Biao,Xu Dajun,Gao Zeyu,Dong Xiaoxu,Li Yusha,Zhang Yingchun
In order to meet the huge demand for millimetre-sized Li 2 TiO 3 ceramic pebbles for future fusion reactors, the aim of this work was to develop a combination of microfluidic and UV curing techniques to greatly improve the preparation efficiency. By employing a cross-junction microfluidic device, large-sized droplets were controllably generated and subsequently subjected to in-situ UV curing, enabling rapid solidification of resin-based ceramic slurries. Systematic investigations revealed critical processing parameters: (1) The rheological behavior of ceramic slurries was governed by solid content and dispersant concentration, directly influencing droplet stability during microfluidic manipulation. (2) UV curing efficacy depended on exposure time(10 ~ 40 s), aging time (30 ~ 120 s) and solid content, and the optimised conditions allow complete cross-linking of 2 mm green pebbles. (3) Post-sintering at an ultra-low heating rate (0.5 °C/min) produced Li 2 TiO 3 ceramic pebbles with a relatively dense microstructure and high crush load(42 N).This microfluidic and UV curing strategy demonstrates potential process controllability and scalability.
研究领域:
材料科学
·
核能工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）