COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Xinlong Tang,Qiong Duan,Yukai Chen,Zilin Yi,Hao Jiang,Yaru Ni,Liang Fang,Chunhua Lu,Zhongzi Xu
Inorganic pigments are a commonly used colorant with various applications and promising prospects. However, the implement of organic pigments is hindered by poor dispersion stability in coatings due to non-uniform morphology and size. Herein, encapsulated pigments of Cobalt Chrome Green CoCr 2 O 4 (PG 26), Cobalt Blue CoAl 2 O 4 (PB 28), Titanium Chrome Yellow TiCrSbO 6 (PB 24) in epoxy microspheres are obtained via an oil-in-water emulsion polymerization. The morphology, particle size, thermal properties, glass transition temperature ( T g ) and color performance of the composite microspheres were characterized by different analytical techniques. The average particle size varied with pigments types and loadings. When the content of CoCr 2 O 4 and CoAl 2 O 4 is in the range of 15 wt%-30 wt%, and TiCrSbO 6 content is between 15 wt%-25 wt%, the composite microspheres exhibit a narrow particle size distribution, regular morphology, and smooth surface. The size followed the rule of CoAl 2 O 4 /epoxy (20–26 μm) > CoCr 2 O 4 /epoxy (1 4 -16μm) > TiCrSbO 6 /epoxy (6–9 μm). Besides, according to the aggregation-induced emission (AIE) principle, the relationship between fluorescence intensity and reaction time was investigated, thus deducing the curing process of the epoxy groups with m-xylenol dimethylamine (MXDA). The kinds of three inorganic fillers exhibit varying effects on the diffusion process of MXDA. TiCrSbO 6 promotes the progress of the epoxy-amine curing reaction. Notably, CoCr 2 O 4 microspheres exhibited stable green value (a*) and color saturation (C*), TiCrSbO 6 microspheres showed increased yellow value (b*) and saturation (C*), and CoAl 2 O 4 microspheres enhanced blue value (b*) with minimal change in lightness (L*). Overall, this study provides a comprehensive understanding of the properties of inorganic pigment/epoxy composite microspheres and highlights their potential for improved dispersion stability in coating applications.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Journal of Environmental Chemical Engineering
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2023
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IF 7.7
Junting Gao,Zhijing Wu,Yaping Wang,Yunjin Zhong,Feng Gao,Wenxing Chen,Wangyang Lu
Humans spend at least 70% of their time indoors, but indoor air pollution has received very little attention compared to outdoor pollution. Indoor air pollutants include inhalable particulate matter , volatile organic pollutants , and biological pollutants . In particular, nicotine in second-hand smoke and pathogenic microorganisms in the air are the most overlooked pollutants, which pose serious threats to human health. Here, low-cost inorganic pigments and diatomite have been selected to modify g-C 3 N 4 to obtain five novel g-C 3 N 4 -based photocatalysts, which are intensely colored and show excellent nicotine degradation performance under both simulated sunlight and white LED illumination. Five g-C 3 N 4 -based photocatalytic textiles obtained by supporting the colored photocatalysts on low-melting-point skin–core composite polyester (LMPET) still exhibited outstanding photocatalytic degradation performance and cyclability in removing nicotine. Some of the photocatalytic textiles also displayed highly efficient bacterial inactivation towards E. coli and S. aureus under white LED illumination. Mechanistic research has revealed that the combination of inorganic pigments and diatomite effectively promotes the separation of photogenerated electrons and holes. Moreover, •O 2 - , 1 O 2 , and •OH have been identified as the main active species in the colored photocatalyst systems. Notably, the colored photocatalysts may be used as dyes to make wall coverings, sofa covers, and so on, which could conceivably purify indoor air while playing a decorative role.
研究领域:
环境科学
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材料科学
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生物学
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产品关联
DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
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2018
·Vol. 71
·期 5
·373-379
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IF 1.059
Bolong Yao,Siyao Geng,Jie Wang,Likui Wang
Pigments with dark appearance and high solar energy reflectance are of great application value. In the present work, dark grey composite pigments with a TiO2/CuO core–shell structure were prepared through calcination of precursors obtained from the precipitation of Cu(OH)2 on TiO2 particles. The composition, structure, and optical properties of the synthesised powders were characterised by colourimetry, near-infrared diffuse reflectance spectroscopy, X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The pigments are composed of rutile TiO2 and tenorite CuO, and the powder colour changes from white to dark grey as the Cu content increases. With a molar ratio of CuO to TiO2 of 0.6, the pigment presents optimal colour (a* = 1.66, b* = −2.19, L* = 52.37) and optical performance. The near-infrared reflectance, the solar reflectance in the near-infrared region, and the total solar reflectance reach 87.2, 70.6, and 37.2 %, respectively. Furthermore, it is demonstrated that the composite pigments exhibit a deeper colour and higher reflectivity than conventional dark-blended powders. These cool dark pigments could be applied in the coatings for buildings (roofs and walls) to improve building comfortability and reduce cooling energy consumption.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Kexin He,Chenxi Sun,Shuxue Yang,Huiting Liu,Heyun Fu,Xiaolei Qu
Inorganic pigments, which often contain significant amounts of nanoparticles, are crucial chemicals for human life. They are produced in massive quantities and widely used in consumer products, food, and pharmaceuticals. Herein, we reported that a variety of commonly used commercial inorganic pigments possess peroxidase-like activity, catalyzing hydrogen peroxide (H 2 O 2 ) decomposition into reactive oxygen species, primarily hydroxyl radical ( OH) and superoxide radical anion (O 2 − ). The catalytic activity of inorganic pigments exhibits saturation kinetics as described by the Michaelis-Menten model, with optimal pH and temperature conditions that can be found in the human body. The enzyme-mimicking activity is strongly correlated with the formation of OH ( R 2 = 0.98), indicating the radical-mediated reaction pathway. The peroxidase-like activity of inorganic pigments can induce significant oxidative stress at health-relevant H 2 O 2 concentrations (3–30 μM), as demonstrated by the ascorbic acid assay. Additionally, the peroxidase-like activity of inorganic pigments is able to mediate the oxidation of tetracycline, with oxidation rate constants positively correlated with the pigments' peroxidase-like activity. The discovery of peroxidase-like activity of commercial inorganic pigments sheds light on the reported oxidative stress exerted by these pigments and has important implications for the health risk assessment of inorganic food and pharmaceutical colorants, as well as colored consumer products.
研究领域:
生物学
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医学
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环境科学
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产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
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2023
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IF 3.9
Fan Yang,Sheng-Tong Wu,Xiao-Qiong Lei,Xue-Lian Han,Ping Chen,Shou-Nian Ding
Traditional contact lenses patterns are mostly colored with organic pigments, but they suffered a pigment leakage risk after long-term wearing, which causes corneal inflammation and ulceration. To solve this issue, the structural color is applied to contact lenses because it has color and pigment free. Herein, we reported the application of SiO 2 photonic crystal microspheres in contact lenses. We successfully prepared SiO 2 photonic crystal ink with structural color and fabricated contact lenses by ink transfer printing, and these contact lenses also contain patterns and pupil areas that are the same as the traditional pigment one. In addition, in vitro cytotoxicity test, physicochemical property test, and optical property test were carried out to verify the performance of the prepared structural color lenses. All results suggested it has great potential to replace traditional organic pigment contact lenses.
研究领域:
材料科学
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生物医学工程
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眼科
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
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2019
·Vol. 45
·期 12
·15768-15771
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IF 3.45
Jinpeng Lv,Mingzhang Tang,Ronghui Quan,Ziyi Chai
TiO 2 and ZnO based white paints are used worldwide to keep the buildings cool by reflecting solar heat flux. However, the cooling effect and lifetime of such coatings are limited by their band gap and fair reflectivity . Herein, scale-up synthesis of pure hexagonal ZnTiO 3 pigment with an optical band gap of 3.75 eV is developed. It is found that the solar absorptance of the as-grown ZnTiO 3 pigment is only 0.115, which is 0.038 and 0.044 lower in relation to the conventional ZnO and TiO 2 pigments, respectively. Furthermore, the actual outdoor roof cooling test was performed at noon on a sunny day in summer. Interestingly, results found that while the ZnO white paint can decrease the roof temperature from 70.1 °C to 59.8 °C, the ZnTiO 3 paint cools the roof from 70.1 °C to 55.2 °C. Compared to the 10.3 °C roof cooling effect of ZnO paint, the as-fabricated ZnTiO 3 paint has a roof cooling effect as high as 14.9 °C, which is much more attractive for energy saving applications.
研究领域:
材料科学
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建筑节能
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太阳反射涂层
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无机颜料
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可持续技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）