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Changwu Zheng,Huijun Han,Aiqin Gao,Meng Ju,Aiqin Hou,Kongliang Xie 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2
Designing photochromic molecules to improve color sensitivity and reversibility of functional materials in the solidifiedstate is still a major challenge. In this work, a series of photochromic molecules containing-spiropyran with different freevolume groups have been designed and synthesized by introducing flexible spacers. The relationship of the photosensitivityand molecular free volume was investigated and the excellent reversible photoswitching molecules in both solution andsolid state were obtained. The photosensitivity of the molecules increased with the increase of molecular free volume. Thephotochromic equilibrium time of the molecule with longer alkyl chain reduced from the 330 s to 60 s, and the recoveringequilibrium time reduced from the 480 s to 40 s. The photosensitivity enhancement mechanism was explained by densityfunctional theory and molecular volume calculations. The designed photochromic molecules were applied to polyesterfabrics. The photochromic materials with excellent photosensitivity and good reversibility were obtained, which exhibitedhigh contrast and sensitive reversible color changes. The photochromic materials have potential applications in the field ofsmart textiles, optical devices, anti-counterfeiting, etc.
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Linda Maharjan,Lekhendra Tripathee,Shichang Kang,Balram Ambade,Pengfei Chen,Huijun Zheng,Quanlian Li,Kundan Lal Shrestha,Chhatra Mani Sharma 한국대기환경학회 2021 Asian Journal of Atmospheric Environment (AJAE) Vol.15 No.4
This study was conducted in the Central Himalayan middle hills to understand the nature of polycyclic aromatic hydrocarbons (PAHs) embedded in aerosol particles, their sources and human health risk assessments. The level of sum of 15 particlephase PAHs was between 9 and 335 ng/m3, with an average concentration of 73±66 ng/ m3. There were strong seasonal differences in total suspended particles (TSP) and particle- bound PAH concentrations with higher concentrations in winter, followed by premonsoon and lowest in monsoon. The main contributor to the suspended particles was 5-ring PAHs (32%), followed by 4-ring (29%), 6-ring (28%), and 3-ring PAHs (11%). Conversely, the gas-phase PAHs showed that 3-ring PAHs contributed utmost to the total particles. The molecular ratios and principal component analysis indicated that both petrogenic and pyrogenic sources, particularly fossil fuel combustion, biomass combustion, and car exhausts, were the major sources of PAHs. The overall average Benzo (a)pyrene equivalent concentration of particulate PAHs was 11.71 ng/m3, which substantially exceeded the WHO guideline (1 ng/m3), and indicated the potential health risks for local residents. The average lifetime inhalation cancer risk (ILCR) estimates associated with carcinogenic PAHs was 8.78×10-6 for adults, suggesting the possible cancer risk and 2.47×10-5 for children, signifying extreme carcinogenic effects of PAHs on children’s health. Therefore, strict measures should be taken to reduce PAHs emissions in the region.
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