SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2022
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IF 4.831
Ling Wu,Feng Li,Haidong Yu,Luping Shen,Mingxi Wang
Spectrophotometry is an economic and rapid method for detecting oxalic acid (OA), while the reported methods have some drawbacks, such as narrow linear range, long response time, delicate operation and required expensive reagents. Herein, we found that the as-synthesized Fe(III)-sulfosalicylate (FeSSA) could be used as an efficient colorimetric chemosensor to detect OA, and the established FeSSA-based fading spectrophotometry showed prominent advantages over the existing ones in detecting OA. The as-established method has wider linear range of 0.80–160 mg/L with regression coefficient ≥ 0.999, while the widest linear range is just 2.7–54 mg/L among the reported ones. Moreover, the method has low limit of detection (0.74 mg/L), extremely fast response (several seconds), satisfactory selectivity, high accuracy and precision. Most importantly, its reliability was further verified by employing it to determine OA concentration during the degradation process of organic pollutants. The measured OA concentration at any time interval was perfectly consistent with those determined by the well-recognized high performance liquid chromatography (HPLC). These confirmed that the FeSSA-based fading spectrophotometry is an efficient, simple, fast, accurate and economic method to determine OA in a wide concentration range.
研究领域:
分析化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
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2013
·Vol. 37
·期 5
·1385-1390
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IF 2.966
Mei-Duo Zhang,Yan-Feng Zhang,De-Hua Li,Guang Wang,Jian-Xin Li
A photochromic polymer film has been fabricated by the layer-by-layer (LBL) self-assembly through alternating the deposition of poly(acrylic acid) bearing a naphthopyran copolymer and poly(4-vinylpyridine) in an organic solvent. The multilayer assembly process is monitored via UV-vis spectroscopy by measuring the increase in absorbance at 380 nm, and the results reveal that the multilayer films grow in a uniform way in each deposition. Atomic force microscopy (AFM) images prove that the surface of the film was relatively smooth. The photochromic properties of the naphthopyran in the LBL films are investigated and the kinetic results confirm that the colored merocyanine in the LBL films show a significant slow fading speed (critical T1/2 decoloration time increased to 64 min in the 3-bilayer film) and are more stable than those in previous reports.
研究领域:
材料科学
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化学
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DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
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2014
·Vol. 35
·期 7
·741-746
·
IF 4.608
Shijun Long,Shuguang Bi,Yonggui Liao,Zhigang Xue,Xiaolin Xie
To achieve a fast photochromic response in solid matrix, photochromic molecules/segments have been either dispersed into elastomers via physical doping or linked to glassy polymers by soft units through covalent bonding. However, the former is lack of high mechanical strength and the latter owes the drawback of time-consumption of synthesis. Here, we propose a facile strategy of co-solvent evaporation to prepare polymer-dispersed photochromic organogel where both high mechanical strength of the glassy polymer matrix and solution-like fast photochromism of the photochromic molecule within organogel can be retained concurrently. Glassy PVA matrix and dispersed organogel of 1,3:2,4-di- O -benzylidene- d -sorbitol/poly(propylene glycol) (DBS/PPG) provide high mechanical strength and sufficient free volume for intramolecular rotation of photochromic spiropyran (SP), respectively. Interestingly, these thin films behave a solution-like decoloration the decay rate of which is 65–70 fold faster than that in the SP-directly doped PVA film and only slightly slower than those in their corresponding PPG solutions.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2024
·
IF 8.3
Yuan-yuan Lin,Chuan-jia Jiao,Yong-gang Qi,Jia-wei Zou,Dong-hua Xu,Shi-fang Luan
Polymer materials with multiple stimuli-responsive properties have demonstrated many potential and practical applications. By covalently introducing spiropyran (SP1) and spirothiopyran (STP) into the polyurethane backbone, photochromic, mechanochromic, and thermally discolored polymer materials have been prepared. In this work, we report for the first time that white light (violet, blue, and green light) above a certain intensity can activate STP to green color. Based on the above discovery, the polyurethane with SP1 and STP can exhibit reversible three-color changes (brown, green, and purple) in response to four stimuli: ultraviolet irradiation, white light irradiation, mechanical stress, and heat. The color-changing polymer materials have high color contrast and excellent reversibility, and can be used for reversible writing, anticounterfeiting and information encryption, etc.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
PubMed
高影响因子
CELLULOSE
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2020
·Vol. 27
·期 14
·8405-8427
·
IF 4.21
Zhao Zhong,Zhang Mingwen,Hurren Chris,Zhou Liming,Wu Jihong,Sun Lu
Abstract The light fastness of fabrics dyed with natural dyes is not satisfactory, which limits their applications in the textile industry. So far, the detailed photofading mechanism of natural dyes remains unclear. To improve the light fastness of cotton fabrics dyed with two natural dyes (sodium copper chlorophyllin and gardenia yellow), two additives ethylenediaminetetraacetic acid disodium salt (EDTA-2Na) and sodium citrate were used to treat the dyed cotton fabrics via the dipping-padding method. The performance results showed that both the two additives had good effects on inhibiting the photofading of the dyed fabrics. The photofading mechanism of the two natural dyes was also investigated. The results from 1,1-Diphenyl-2-picrylhydrazyl free radical (DPPH) scavenging assay and cyclic voltammetry tests demonstrated very limited antioxidant properties of the two dyes. Singlet oxygen and hydroxyl radical were detected in the photosensitizing process of the two dyes by electron paramagnetic resonance method. The photo-induced chemiluminescence (PICL) tests confirmed that the color changes of the dyed cotton fabrics were reduced because the reactivities of the two dyes to react with reactive oxygen species were dramatically reduced in the presence of EDTA-2Na and sodium citrate. End products generated in the photofading of the two dyes were detected by high-performance liquid chromatography-mass spectrometry (HPLC–MS). Based on the comprehensive analysis of above results, possible degradation pathways of the two dyes were proposed. The mechanism study in this research may help shed light on proposing universal solutions to the poor light fastness of most natural dyes on cotton. Graphic abstract
研究领域:
纺织科学
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化学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF CULTURAL HERITAGE
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2024
·
IF 3.5
Ming Guan,Yao Chen,Xin Li,Yunli Wang,Xiaojing Kang,Xingjun Hu,Liang Qu,Guanghua Li
Silk relics, as the typical representative of organic artifacts, are important historical materials for the study of Chinese and world culture. However, these relics are extremely vulnerable to burial or conservation environments which play a crucial role in its acceleration of deterioration. Light-induced color degradation is one of the most serious threats to textiles, resulting in regional fading of these objects. This special threat severely affected their artistic and historical values and produced irrevocable alteration. The evaluation of discoloration of dyed silk relics has been the hot spot of conservation science. Therefore, the regional lightfastness assessment of textile artifacts has been of significance for their color preservation. Recently, microfading spectrometry has been broadly applied for simulating accelerated photofading process and evaluating if the pigment or dye was susceptible to discoloration. With the goal of finely demonstrating color changes in multiple dimensions, the integrated data analytical method is of great necessity. In this work, a data analytical strategy has been developed for elaborately evaluating the fading behavior of dyestuff from the spectral, kinetic, and chromatic aspects with their color change trajectory also provided. Based on the strategy, 10 representative vegetable dyes have been studied. Furthermore, the potential fading behaviors of 3 groups of dyed silks unearthed from different places of Keyakekuduke beacon tower site, Xinjiang were evaluated, compared and predicted. From the results, it was demonstrated that archaeological silk objects unearthed from different places of one site may potentially fade to light in a different manner. Hence, precisely and in-depth monitoring the potential color degradation to light was of great necessity. Therefore, the developed strategy in this work represents a constructive tool and provides the methods for relevant research on other color artifacts.
研究领域:
文物保护科学
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分析化学
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文化遗产研究
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产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Sha Long,Yanghang Liu,Yu Jiang,Yuting Xue,Feiyue Zhou,Dan Yu,Wei Wang
At present, inorganic photochromic hydrogels have aroused great interest among researchers and have shown great application prospects in the intelligent display field of optical information switching. However, long coloring and self-bleaching times have greatly limited their development. In this paper, the photochromic unit ammonium molybdate tetrahydrate (Mo) was embedded in a network of polyacrylamide. Pore creation via confinement of the decomposition gas from fixed sodium bicarbonate (SB) yielded a porous photochromic hydrogel. The porous hydrogel possessed macro-sized pores of 500–800 μm and exhibited rapid photoresponse and self-bleaching properties. The resulting porous hydrogel underwent a photochromic reaction after 40 s of UV light exposure. Simultaneously, the blue-green hydrogel returned to its initial color state within 1 h under natural conditions (indoors; temperature: 25 °C; light intensity: 22 W/m2). This shows that the porous hydrogels have good reversibility. Compared with other photochromic hydrogels mixed with ammonium molybdate, the prepared porous hydrogels have good advantages. The as-prepared hydrogel exhibits excellent reversible repeatability, elasticity, and stable ultraviolet light response. In summary, its good stability and outstanding reversible repeatability make it a potential material for optical information switching, ink-free printing, information encryption, and rewritable systems.
研究领域:
材料科学
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高分子化学
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功能材料
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智能响应材料
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光响应系统
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产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
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2018
·
IF 0.668
Qian Zhao,Yanhua Yang,Kecheng Shen,Xian Tao,Yingzhong Shen
Three novel types of naphthopyran derivatives containing alkoxyl and phenyl moieties, 13-butyl −6,11-dimethyl-3,3-diphenyl-3,13-dihydrobenzo[h]indeno[2,1-f]chromen-13-ol (NP), 13-butyl-3,3-bis(6-methoxy-[1,1′-biphenyl]-3-yl)-6,6-dimethyl-3,13-dihydrobenzo[h] indeno[2,1-f]chromen-13-ol (NP1) and 13-butyl-3,3-bis(6-methoxy-4′-naphthalenyl-[1,1′-biphenyl]-3-yl)-6,11-dimenthyl-3,13-dihydrobenz[h]indeno[2,1-f]chromen-13-ol (NP2), were synthesised and characterised. Measurements indicated that they possessed an excellent photochromic response, a rapid thermal bleaching rate and good fatigue resistance. Meanwhile, the UV maximum absorption wavelengths of NP1 (562 nm) and NP2 (597 nm) appeared bathochromically shifted compared with NP (536 nm). The bleaching rate of NP1 was found to be approximately twice that of NP. The results indicated that the UV maximum absorption wavelength and bleaching rate increase with increasing length of the phenyl side chain moieties. In PMMA film, the compounds showed almost the same photochromic properties in the solid state as in dichloromethane solution. The UV absorbance with high-contrast switching in solid film could be beneficial for practical applications.
研究领域:
有机化学
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材料科学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Yu Zhong,Zhiqi Wang,Lingqi Quan,Yiqiang Wu,Dongying Hu,Jun Cheng,Yanjie Zheng,Fangchao Cheng
The rapid development of anti-counterfeiting technology has brought new challenges to the repeatability and stability of reversible fluorescence/photochromic switching hydrogels. To address this issue, a series of chemical cross-linked cellulose-based intelligent responsive hydrogels were synthesized by free-radical graft copolymerization in a hydrothermal process. This strategy allows for the creation of a chemical cross-linked three-dimensional structure that anchors photochromic ammonium molybdate and fluorescent carbon dots together, resulting in enhanced stability and mechanical properties. Especially, the tensile and compressive strength of hydrogel reached a maximum value of 280 kPa and 560 kPa, respectively, which far exceeds that of some reported hydrogels. The resultant hydrogels exhibited desired reversible fluorescence/photochromic switching, reversible printing and erasing of patterns, and information encryption/decryption. Notably, the change of photochromism from yellow to green can be realized, and the self-fading process can be shortened to 25 min at 60 °C instead of 6 h at room temperature. More importantly, the fluorescence quenching phenomenon of the hydrogel occurs gradually after 2 min of continuous irradiation, and it can be recovered by selective treatment with ethanol. Overall, this study provides a simple strategy for the preparation of environmentally friendly reversible fluorescence/photochromic switching cellulose-based hydrogels for information encryption.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MICROENCAPSULATION
·
2023
·
IF 3.9
Ran Tao,Qianyu Zhang,Jialing Duan,Ran Chen,Liyun Yao,Ruiteng Zhang,Gang Dong,Huali Chen
Aims The aim of this study is to develop a liposome that could exert unparalleled antioxidant effects. In the present study, a vitamin C (VC)/vitamin E (VE)-co-loaded multivesicular liposome (VCVE-MVL) was constructed.Methods Vitamins were encapsulated in soybean phosphatidylcholine (SPC) and cholesterol (CHO) by multi-emulsification method. The concentration of VC was determined by Fast Blue method. The concentration of VE was determined by high performance liquid chromatography (HPLC). Vitamin antioxidant capacity in vitro and in vivo was determined using β-carotene bleaching.Results VCVE-MVL with particle diameter of 848.55 ± 0.29 nm and SPAN of 0.16 ± 0.11 were obtained. The encapsulation efficiency of VC reached 48.51% (w/w)±0.15. Compared with VC/VE solution, VCVE-MVL had a higher permeation efficiency. In addition, the in vitro and ex-vivo antioxidant tests verified the adequate antioxidant activity of VCVE-MVL.Conclusions In conclusion, the antioxidant synergistic system we constructed and demonstrated its potential applications in the cosmetics industry.
研究领域:
药剂学
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药学
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化妆品行业
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2022
·
IF 5.141
Bingbing Cui,Chuanpan Guo,Guodong Fu,Zhihong Zhang
A novel photochromic and self-bleaching hydrogel was prepared based on the Cu-doped tungsten oxide (WO 3 ) hybrid encapsulated in the co-polymer matrix polymerized using acrylamide (AM) and hydroxyethyl acrylate (HEA) as monomers. The Cu-WO 3 -25 % hybrid was generated by introducing Cu species into the lattice of WO 3 with hexagonal-like prismatic structure and acted as light absorber. Given that WO 3 and Cu-doped WO 3 hybrids possess superior water solubility by using water and deep eutectic solvents (DESs, ChCl:EG) containing sufficient hydrogen bond as co-solvent, the high transparency of 90 % of the hydrogels was achieved. As compared with P(AM-HEA)-WO 3 -based hydrogel, the P(AM-HEA)-Cu-WO 3 -X hydrogel exhibited the enhanced coloration degree under UV irradiation. The P(AM-HEA)-Cu-WO 3 -25 % photochromic hydrogel changed from colorless to blue immediately once illuminated by UV light, and turns into dark-blue with the irradiation time going on. The self-bleaching process indicates it only takes 40 min for the P(AM-HEA)-Cu-WO 3 -25 % hydrogel to return to the original colorless transparent state. Furthermore, the hydrogel systems exhibit efficient antibacterial activities against bacteria of both E. coli and S. aureus , accompanying with outstanding biocompatibility. As such, the fabricated hydrogel demonstrates rapid photoresponse, self-bleaching process, superior antibacterial performance, and cell viability, showing a great potential application as stimuli-responsive materials.
研究领域:
材料科学
·
化学
·
生物材料
·
纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2017
·
IF 3.648
Zhiyun Chen,Zilin Yang,Weiguo Shen
The reaction kinetics for alkaline fading of malachite green (MG) in the critical binary solution 2-butoxyethanol + water and of crystal violet (CV) in the critical microemulsion water/bis(2-ethylhexyl) sodium sulfosuccinate (AOT)/ n -decane with the molar ratio of water to AOT being 30 have been studied by the three-wavelength UV-spectrophotometry at initial reaction stage and various temperatures. It was found that the reaction rates k obs for both above reactions were well described by the Arrhenius equation in the temperature ranges far away from the critical points. The critical slowing down effects were observed in the near-critical regions and the corresponding critical slowing down exponents were determined to be 0.146 ± 0.014 and 0.035 ± 0.006 for the two reactions, respectively. The former exhibited both the dynamic and thermodynamic critical slowing down effects; while the latter showed no thermodynamic singularity. It was attributed to the particular experimental design in this work that made the dimer/monomer droplet equilibrium in the critical microemulsion system no longer affect the reaction kinetics.
研究领域:
化学动力学
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物理化学
·
胶体与界面化学
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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）