PROGRESS IN ORGANIC COATINGS
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2016
·
IF 2.632
Jinyue Dai,Xiaoqing Liu,Songqi Ma,Jinggang Wang,Xiaobin Shen,Shusen You,Jin Zhu
A UV curable unsaturated monomer (IG) was synthesized from itaconic acid and glycidyl methacrylate (GMA). After its chemical structure was confirmed by Fourier Transform Infrared Spectroscopy (FT-IR) and Nuclear Magnetic Resonance ( 1 H NMR and 13 C NMR), IG was used as a crosslink agent to copolymerize with acrylated epoxidized soybean oil (AESO) and a series of UV-cured coatings were prepared. Their thermal and mechanical properties as well as the coating properties on tinplate were investigated. Results demonstrated that not only the mechanical properties such as tensile strength and modulus, but also the coating performances in terms of hardness, flexibility, adhesion and solvent resistance of the cured AESO were increased significantly with the increasing content of IG. The synthesized bio-based IG showed great potential to improve the coating properties of AESO.
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MENDELEEV COMMUNICATIONS
·
2017
·
IF 1.741
Ivan P. Pozdnyakov,Victoria A. Salomatova,Marina V. Parkhats,Boris M. Dzhagarov,Nikolai M. Bazhin
pH-dependent efficiency of singlet oxygen ( 1 O 2 ) generation by fulvic acids (FAs) from different sources was estimated by time-resolved luminescence technique. All FAs turn up the highest quantum yields of 1 O 2 for neutral and alkali solutions [ ϕ 532 ( 1 O 2 )] = (0.3•2.5)í10 •2 ] and 3•5-fold decrease in ϕ 532 ( 1 O 2 ) for acidic solutions. Potential of FA ChangSheng (the best 1 O 2 generating agent among investigated FAs) in relation to photodegradation of non-UVA-absorbing herbicide Amitrole (3-amino-1,2,4-triazole) was demonstrated.
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Journal of CO2 Utilization
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2016
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IF 4.764
Haiqiang Wang,Zhuxing Sun,Qian Li,Qijun Tang,Zhongbiao Wu
200–420 nm UV light was for the first time introduced for CO 2 photocatalytic reduction over graphitic carbon nitride (g-C 3 N 4 ). It was surprisingly found that thiourea derived g-C 3 N 4 (TCN), which showed inferior activity in CO 2 reduction under visible light irradiation, exhibited more remarkable CO 2 conversion efficiency under >200 nm light irradiation compared to g-C 3 N 4 synthesized from urea (UCN) and commercial TiO 2 (P25). Also, the highest selectivity to CO 2 conversion was observed over TCN while P25 showed the most prominent H 2 production followed by UCN. Through a series of characterizations, the more abundant –NH x species that were responsible for CO 2 activation, the enhanced reducing ability of photo-excited electrons under UV light and the higher photo-exited electron-hole separation efficiency were supposed to contribute to the excellent CO 2 photocatalytic reduction activity of TCN under >200 nm UV–vis light irradiation, whilst its visible-light activity was relatively weak because of its limited surface area. Further, TCN performed a wonderful stability with a good record of circle tests in this irradiation condition.
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WATER RESEARCH
·
2017
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IF 6.942
Mingjie Huang,Tao Zhou,Xiaohui Wu,Juan Mao
This study demonstrated the efficient degradation of a typical bio-refractory antibiotic norfloxacin (NOR) in a photochemical iron oxides/oxalate system adopting magnetic catalyst (Fe 3 O 4 /UV/Ox). It was found that the in-situ generated HO was the main reactive oxygen species (ROS) but CO 2 – could also participate in the NOR degradation to form formylate organic intermediates. Besides, NOR would be degraded via an interesting pathway comprising an initial lag and a subsequent rapid period, where the former could be eliminated by introducing the pre-dissolution of Fe 3 O 4 particles. Furthermore, specific comparative investigations and surface characterizations of pre-adsorbed Fe 3 O 4 particles had evidenced that the existence of surface-bound iron-Ox complexes would be critical for the heterogeneous photochemical dissolution of Fe 3 O 4 and effectively initiated the subsequent homogeneous-heterogeneous NOR degradation. Finally, a comprehensive distinguishing reaction mechanism was proposed including a homogeneous-heterogeneous iron cycle on the solid-water interface and a series of homogeneous radical reactions. Therein, complexation instead of photochemical reduction would be dominant during the whole dissolution process even under UV irradiation. Rapid electrons exchange would occur photochemically between Fe II and Fe III in the octahedral sites, further weakening the surface Fe-O bonds and accelerating its breakaway from the bulk Fe 3 O 4 structure. This work could distinguish the complex heterogeneous/homogeneous reactions in the photochemical in-situ chemical oxidation systems that utilize naturally abundant iron oxides and polycarboxylic acids.
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International Journal of Environmental Research and Public Health
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2017
·Vol. 14
·期 11
·1414
·
IF 2.101
Yang Du,Wen-Qian Wang,Zhou-Tao Pei,Fahmi Ahmad,Rou-Rou Xu,Yi-Min Zhang,Li-Wei Sun
Ultraviolet (UV)-absorbing chemicals (UV filters) are used in personal care products for the protection of human skin and hair from damage by UV radiation. Although these substances are released into the environment in the production and consumption processes, little is known about their ecotoxicology effects. The acute toxicity and potential ecological risk of UV filters benzophenone-3 (BP-3) and benzophenone-4 (BP-4) onChlorella vulgaris,Daphnia magna, andBrachydanio reriowere analyzed in the present study. The EC50values (96 h) of BP-3 and BP-4 onC. vulgariswere 2.98 and 201.00 mg/L, respectively. The 48 h-LC50of BP-3 and BP-4 onD. magnawere 1.09 and 47.47 mg/L, respectively. The 96 h-LC50of BP-3 and BP-4 onB. reriowere 3.89 and 633.00 mg/L, respectively. The toxicity of a mixture of BP-3 and BP-4 onC. vulgaris,D. magna, andB. rerioall showed antagonistic effects. The induced predicted no-effect concentrations of BP-3 and BP-4 by the assessment factor method were 1.80 × 10−3and 0.47 mg/L, respectively, by assessment factor (AF) method, which were both lower than the concentrations detected in the environment at present, verifying that BP-3 and BP-4 remain low-risk chemicals to the aquatic ecosystem.Keywords:benzophenone-3;benzophenone-4;UV filters;acute toxicity;ecological risk assessment
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Wanchun Guo,Yin Jia,Kesong Tian,Zhaopeng Xu,Jiao Jiao,Ruifei Li,Yuehao Wu,Ling Cao,Haiyan Wang
UV-triggered self-healing of single microcapsules has been a good candidate to enhance the life of polymer-based aerospace coatings because of its rapid healing process and healing chemistry based on an accurate stoichiometric ratio. However, free radical photoinitiators used in single microcapsules commonly suffer from possible deactivation due to the presence of oxygen in the space environment. Moreover, entrapment of polymeric microcapsules into coatings often involves elevated temperature or a strong solvent, probably leading to swelling or degradation of polymer shell, and ultimately the loss of active healing species into the host matrix. We herein describe the first single robust SiO2 microcapsule self-healing system based on UV-triggered cationic polymerization for potential application in aerospace coatings. On the basis of the similarity of solubility parameters of the active healing species and the SiO2 precursor, the epoxy resin and cationic photoinitiator are successfully encapsulated into a single SiO2 microcapsule via a combined interfacial/in situ polymerization. The single SiO2 microcapsule shows solvent resistance and thermal stability, especially a strong resistance for thermal cycling in a simulated space environment. In addition, the up to 89% curing efficiency of the epoxy resin in 30 min, and the obvious filling of scratches in the epoxy matrix demonstrate the excellent UV-induced healing performance of SiO2 microcapsules, attributed to a high load of healing species within the capsule (up to 87 wt %) and healing chemistry based on an accurate stoichiometric ratio of the photoinitiator and epoxy resin at 9/100. More importantly, healing chemistry based on a UV-triggered cationic polymerization mechanism is not sensitive to oxygen, extremely facilitating future embedment of this single SiO2 microcapsule in spacecraft coatings to achieve self-healing in a space environment with abundant UV radiation and oxygen.
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SCIENCE OF THE TOTAL ENVIRONMENT
·
2024
·
IF 8.2
Qian Zhang,Xinyan Xu,Chenzhuo Song,Dengke Zhang,Yi Kong,Xinyi Cui
Tire wear particles (TWP), as an emerging type of microplastics, are a significant source of contaminants in roadside soils due to their high concentration of pollutants, including polycyclic aromatic hydrocarbons (PAHs). This study explored the impact of ultraviolet (UV) exposure and natural aging on the in vitro bioaccessibility of PAHs associated with TWP in soil on a China-wide scale. Our findings suggested that UV exposure amplified the negative charge of TWP by 75 % and increased the hydrophobic groups on the particle surface. The bioaccessibility of 3- and 4-ring PAHs in TWP was significantly ( p < 0.05) heightened by UV exposure. After 20 types of soils containing 2 % UV-exposed TWP underwent natural aging, the bioaccessibility of PAHs saw a significant decrease ( p < 0.05) to 16–48 %, compared to 28–96 % in the unaged group. Soil pH and electrical conductivity (EC) were the two primary soil properties positively influencing the reduction of in vitro PAHs concentration and PAHs bioaccessibility. According to the prediction results, soils in southern China presented the highest potential region for the release of bioaccessible PAHs from TWP, highlighting the regional specificity of environmental impact. Our study provides valuable insights into the biological impact of PAHs associated with TWP on a regional scale, and offers scientific evidence for targeted soil risk management strategies.
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Qi Gu,Kefan Chen,Xiong Zhang,Shuaihua Wang,Shaofan Wu,Wanxia Huang
Chiral two-dimensional perovskites are a promising candidate for circularly polarized light (CPL) detection, which combine inherent chirality with excellent optoelectronic properties, while exhibiting good structural stability. In this paper, a pair of chiral two-dimensional perovskites, single-crystal R/S-(BrBA)2PbBr4 are synthesized using a cooling crystallization solution method. Due to the introduction of chiral organic molecules, the inorganic layers undergo significant distortion and deformation. The large optical bandgap of the materials and the vertically oriented electrode structure of the detector result in an extremely low dark current, combined with circular dichroism (CD) spectroscopy and a photocurrent anisotropy factor of 0.14 at 405 nm, and demonstrate the good potential of the materials for detecting circularly polarized light in the ultraviolet band. In addition, the unique semiconductor properties enable it to have a detection sensitivity of 531.33 μC Gy–1 cm–2 (at 0.15 V/μm) and a detection limit of less than 100 nGy s–1 in X-ray detection, which is far lower than that of requirements in conventional medical diagnosis (5.5 μGy s–1). The final imaging experiments have also verified its feasibility for application in X-ray imaging.
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CELLULOSE
·
2024
·Vol. 31
·期 7
·4627-4644
·
IF 4.9
Yuan Hua-Bin,Zhao Manman,Zhu Xiaowei,Sha Desheng,Chen Guoqiang,Xing Tieling
Numerous techniques for achieving superhydrophobic modification of cotton fabrics are documented in existing literature. However, pursuing multifunctionality, especially concerning textile performance, remains a topic of significant research interest. This study introduced a straightforward yet highly effective method for producing modified cotton fabric (SFC) exhibiting a vibrant orange-yellow coloration, along with exceptional self-cleaning, stain-resistant, UV-blocking, anti-icing, and photothermal de-icing properties, through the utilization of ferric chloride hexahydrate (FeCl 3 ·6H 2 O) and polydimethylsiloxane (PDMS). The surface of the SFC was evenly coated with small nanoparticles, identified by X-ray diffractometer (XRD) as β-FeOOH. The SFC displayed a water contact angle of 165.9° and a sliding angle of 2°, demonstrating outstanding superhydrophobicity. In addition, the SFC achieved a UPF value of 80, indicating exceptional UV-blocking capabilities. Additionally, the SFC exhibited remarkable stability when subjected to harsh conditions, including exposure to strong acid (pH = 1) and alkali (pH = 13), various chemical reagents, 600 min of water washing, and 30 cycles of abrasion testing. The approach proposed in this study offers the advantages of cost-effectiveness, environmental friendliness, and fluorine-free characteristics, and is applicable across a range of fabrics, and has certain practical utility. Graphical abstract
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
·
IF 5.8
Jianan Shan,Gaoming Mo,Qing Sun,Jing Huang,Qin Ouyang,Qing Huang
SiC fiber is an important structural material in high-temperature extreme environments and nuclear energy applications. Oxidation and electron irradiation are main curing methods for the fabrication of industrial SiC fibers. In this work, a photo-sensitive polyvinylaluminocarbosilane (PVACS) is facilely prepared by blending polyaluminocarbosilane (PACS) and 1,3,5,7-tetramethyl-1,3,5,7-tetravinylcyclotetrasiloxane (D4Vi), which can be melt spun, cured by ultraviolet irradiation at room temperature. After thermal pyrolysis and sintering, the SiC(OAl) fibers with oxygen content of 8.84 wt% and C/Si ratio of 1.34, the SiC(Al) fibers with oxygen content of 0.29 wt% and C/Si ratio of 1.03 are achieved. The cured mechanism and the structural evolution from the precursor fiber to the final ceramic fibers is investigated. The results show that homopolymerization of D4Vi is the main curing mechanism in addition to the β-addition of hydrosilylation. Different from the typical oxidative curing, the oxygen in the fibers mainly comes from D4Vi. At about 800 ℃, the SiAl x O y phase, the SiC x O y phase and free carbon are formed. At 1200 ℃, the Al-C bonds possibly in Al 4 C 3 are formed. At around 1600 ℃, Al may exist mainly in the form of Al 4 O 4 C, and the amorphous carbon phase changes into crystalline graphitic structure. Meanwhile, a lot of mesopores and macropores in the SiC(OAl) fibers are formed due to thermal decomposition of the SiC x O y phase. However, at 1800 ℃, the SiC(Al) fibers densify again due to the formation of Al 2 OC and Al 4 SiC 4 phases, which also inhibit the growth of β-SiC and favor the formation of α-SiC.
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COMPOSITES SCIENCE AND TECHNOLOGY
·
2024
·
IF 8.3
Shiwei Feng,Jingjing Cui,Yunlong Guo,Weizi Gao,Yongding Sun,Chen Liang,Zhe Lu,Biao Zhang
Integration of functional nanomaterials into 3D printing polymers expands the versatility of 4D printing. However, high performance and multi-UV curable materials adaptable nanoparticles for 4D printing are still urgently needed to avoid printing complications and deformation limitations caused by high filler loadings. Here, high performance oxygen-deficient tungsten oxide nanoparticles (WO 3-x NPs) are synthesized via a straightforward hydrothermal method, and the resulting nanoparticles (NPs) exhibit excellent photothermal property which can rapidly increase from room temperature to 562.6 °C in less than 2 s via near-infrared (NIR) light irradiation. Moreover, these NPs can also be well dispersed in a wide range of photocurable polymers, such as UV curable hydrogel, shape memory polymer, and dual-curing polymer, forming variety of nanocomposite systems. The formed nanocomposite systems can be manufactured into complex 3D structures via digital light processing based 4D printing. Just trace WO 3-x NPs in nanocomposite systems (<2 wt‰) can help realize the controllable photothermal properties of the printed structures, which are capable of arbitrary spatial deformation, remote-controlled distortion, and on-demand reinforcement in response to NIR irradiation, presenting a succinct and impactful approach to broadening the application scope of light-controlled DLP-based 4D printing.
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ChemNanoMat
·
2024
·
IF 2.6
Yuqi Guo,Jiali Xu,Hu Li,Minghui Sun,Linrui Hou,Changzhou Yuan
Carbonized polymer dots (CPDs) have received much attention in recent years owing to their cost-effective synthesis, high resistance to photobleaching, environmental friendliness, and excellent biocompatibility. However, the aggregation-induced fluorescence quenching is a great obstacle to its applications. In this work, the highly fluorescent CPDs are prepared by a facile hydrothermal method assisted by polyethylene glycol (PEG) as the surface passivation agent, where phthalic acid and ethylenediamine are used as carbon and nitrogen source, respectively. Meanwhile, five types of PEG species are applied to prepare five CPDs to investigate PEG on optical properties of the resultant CPDs, among which the best quantum yield reaches 57.0%. The promising applications of CPDs as fluorescent inks, sensors, light emitting diodes, and UV shielding films have been demonstrated. Overall, our contribution here develops a facile and accessible route for the synthesis of CPDs and further demonstrates its versatile applications.
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危险品化学品经营许可证（带存储）