PROGRESS IN ORGANIC COATINGS
·
2018
·
IF 2.955
Yan Xu,Xiaoqian Ji,Fangqing Ge,Chaoxia Wang
The hydroxyl terminated polyurethanes covalently bonded anthraquinone chromophores into skeleton were successfully synthesized based on 1-amino-4-hydroxy-2-(6-hydroxy-hexyloxy) anthraquinone (AHHA) and dimethylolpropionic acid (DMPA) as chain extenders. The UV–visible spectroscopy of polyurethane solution revealed that the conjugated structure of chromophore was not affected after bonding into polyurethane. Owing to the absorption of chromophore in the range of 360–630 nm, the polyurethane with 0.12 wt% AHHA in backbone possessed high transmittance of 94.6% in the range of 630–800 nm and that of polyurethane with 0.89, 1.32, 2.13 wt% AHHA were 87.9%, 82.5%, 78.6%, respectively. Interestingly, the optical transmittance of corresponding polyurethane was 80.5% in the range of 630–800 nm. Transparency was strongly related to the phase separation and crystallization behavior. The DSC curve revealed no endothermic peak and XRD showed a broad diffraction peak, demonstrating that chromophore-incorporated polyurethane with different AHHA amounts had no distinct phase separation and crystallization that accounted for good transparency.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Chao Nan Zhu,Tianwen Bai,Hu Wang,Wei Bai,Jun Ling,Jing Zhi Sun,Feihe Huang,Zi Liang Wu,Qiang Zheng
Bioluminescence is widespread in nature such as the jellyfish, which inspires scientists to design polymer hydrogels with tunable fluorescence. However, it remains a big challenge to develop white-light-emitting hydrogels with local tunability of the fluorescent behavior. Herein, we report a white fluorescent hydrogel prepared by one-pot micellar copolymerization of hydrophilic acrylamide and hydrophobic single donor–acceptor chromophore monomer, in which the unimer and the dimer of the chromophore coexist and generate high- and low-energy emission, respectively, under excitation. The fluorescent behavior of the hydrogel can be well tuned by phototreatment or heat treatment that induces unimer-to-dimer transformation of the chromophore and thus variation of the fluorescent color from blue to white and then to yellow. The fluorescence can also be reversibly switched off by forming terpyridine–Cu2+ chelate complexes and recovered by using chelating agent to extract the Cu2+ ions out of the gel matrix. These properties afford patterning the fluorescent hydrogel, which is transparent under daylight yet shows the pattern under ultraviolet light. These patterned fluorescent hydrogels should find applications in protected message display for improved information security.
研究领域:
材料科学
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高分子化学
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生物仿生学
✓ 已验证
DOI
高影响因子
Nature Communications
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2024
·Vol. 15
·期 1
·1-10
·
IF 14.7
Yang Shuang,Yuan Huiqing,Guo Kai,Wei Zuting,Ming Mei,Yi Jinzhi,Jiang Long,Han Zhiji
The utilization of low-energy photons in light-driven reactions is an effective strategy for improving the efficiency of solar energy conversion. In nature, photosynthetic organisms use chlorophylls to harvest the red portion of sunlight, which ultimately drives the reduction of CO 2 . However, a molecular system that mimics such function is extremely rare in non-noble-metal catalysis. Here we report a series of synthetic fluorinated chlorins as biomimetic chromophores for CO 2 reduction, which catalytically produces CO under both 630 nm and 730 nm light irradiation, with turnover numbers of 1790 and 510, respectively. Under appropriate conditions, the system lasts over 240 h and stays active under 1% concentration of CO 2 . Mechanistic studies reveal that chlorin and chlorinphlorin are two key intermediates in red-light-driven CO 2 reduction, while corresponding porphyrin and bacteriochlorin are much less active forms of chromophores.
研究领域:
化学
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生物化学
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能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2020
·Vol. 8
·期 8
·1902114
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IF 8.286
Mingze Li,Maxim S. Molokeev,Jing Zhao,Zhiguo Xia
Zero-dimensional (0D) organic–inorganic hybrid luminescent metal halides have many promising optoelectronic applications; however, the single building unit in the 0D framework restricts their multimode optical control and photoluminescence tuning. Thus, it remains urgent but challenging to rationally design distinct anionic polyhedral with different optical functions and further expand this family by an equivalent cation substitution and halogen replacement. Herein, (C 9 NH 20 ) 9 [Pb 3 X 11 ](MX 4 ) 2 (X = Br and Cl, M = Mn, Fe, Co, Ni, Cu, and Zn) is successfully synthesized verifying the rationality of the design philosophy, and the optical characterizations demonstrate the effects of X-position anions and M-position cations on luminescence process. Intriguingly, both [Pb 3 X 11 ] 5− and [MX 4 ] 2− perform as inorganic building units in this 0D system and optically active centers, in which the former leads to high-efficiency broad-band yellow/green emission originating from self-trapped excitons and the as-observed multicomponent chromophores are derived from the absorption of the latter in the visible light region. The present work highlights the importance of different optical functional units showing synergistic effects on the physical properties and inspires future studies to explore multifunctional application of 0D luminescent metal halides.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
Results in Physics
·
2023
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IF 5.3
Chaochao Qin,Jie Li,Jian Song,Shuhong Ma,Jicai Zhang,Guangrui Jia,Zhaoyong Jiao,Zunlue Zhu,Yuhai Jiang,Zhongpo Zhou
Energy transfer plays an essential role in inorganic semiconductor nanocrystal-chromophore hybrids which show potential applications in light collection and emitting. The understanding of the fundamental mechanics of energy transfer processes is vital to enhance the performance of light-harvesting optoelectronic devices. Here we report the effect of varying donor sizes on energy transfer from perovskite nanocrystals to chromophore molecules. Both single energy transfer and triplet transfer mechanisms have been identified to occur between CsPbBr 3 quantum dots linked to a Rhodamine B dye. The ease of adjusting optical properties via particle-size controlling provides a particular platform to accommodate excited-state couplings in perovskite-chromophore hybrids.
研究领域:
材料科学
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光学
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纳米技术
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Environmental Sciences
·
2023
·
IF 6.9
Yuqi Gan,Xiaohui Lu,Shaodong Chen,Xinghua Jiang,Shanye Yang,Xiewen Ma,Mei Li,Fan Yang,Yewen Shi,Xiaofei Wang
The reaction of carbonyl-to-imine/hemiaminal conversion in the atmospheric aqueous phase is a critical pathway to produce the light-absorbing N-containing secondary organic compounds (SOC). The formation mechanism of these compounds has been wildly investigated in bulk solutions with a low ionic strength. However, the ionic strength in the aqueous phase of the polluted atmosphere may be higher. It is still unclear whether and to what extent the inorganic ions can affect the SOC formation. Here we prepared the bulk solution with certain ionic strength, in which glyoxal and ammonium were mixed to mimic the aqueous-phase reaction. Molecular characterization by High-resolution Mass Spectrometry was performed to identify the N-containing products, and the light absorption of the mixtures was measured by ultraviolet-visible spectroscopy. Thirty-nine N-containing compounds were identified and divided into four categories (N-heterocyclic chromophores , high-molecular-weight compounds with N-heterocycle, aliphatic imines/hemiaminals, and the unclassified). It was observed that the longer reaction time and higher ionic strength led to the formation of more N-heterocyclic chromophores and the increasing of the light-absorbance of the mixture. The added inorganic ions were proposed to make the aqueous phase somewhat viscous so that the molecules were prone to undergo consecutive and intramolecular reactions to form the heterocycles. In general, this study revealed that the enhanced ionic strength and prolonged reaction time had the promotion effect on the light-absorbing SOC formation. It implies that the aldehyde-derived aqueous-phase SOC would contribute more light-absorbing particulate matter in the industrial or populated area where inorganic ions are abundant.
研究领域:
大气化学
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环境科学
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分析化学
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 33
·17517-17529
·
IF 6.895
Mengyuan Cui,Haonan Li,Xiangyu Ren,Lili Xia,Dawei Deng,Yueqing Gu,Dahong Li,Peng Wang
Hydrogen sulfide (H2S) as an important gaseous signaling molecule is closely related to numerous biological processes in living systems. To further study the physiological and pathological roles of H2S, convenient and efficient detection techniques for endogenous H2S in vivo are still in urgent demand. In this study, an electrochromic chromophore, dicationic 1,1,4,4-tetra-aryl butadiene (EM1), was innovatively introduced into upconversion nanoparticles (UCNPs) and a nanoprobe, PAAO–UCNPs–EM1, was constructed for the detection of H2S. This nanosystem was made of core–shell upconversion nanoparticles (NaYF4:Yb,Tm@NaYF4:Yb,Er), EM1, and polyacrylic acid (PAA)-octylamine. The EM1 with strong absorption ranging from 500 to 850 nm could serve as an energy acceptor to quench the upconversion luminescence of UCNPs through the Förster resonance energy transfer (FRET) process. In the presence of H2S, the EM1 in the nanoprobe was reduced to a colorless diene (EM2), resulting in the linear enhancement of luminescence emissions at 660 nm and 800 nm under the excitation of 980 nm light because the FRET was switched off. The nanoprobe PAAO–UCNPs–EM1PAAO–UCNPs–EM1 exhibited fast response and high sensitivity to H2S with a LoD of 1.21 × 10−7 M. Moreover, it was successfully employed in detecting the endogenous and exogenous H2S in living cells with high selectivity and low cytotoxicity. Also, this nanoprobe could distinguish normal and tumor cells by an upconversion luminescence imaging of endogenous H2S. Furthermore, the nanoprobe could significantly monitor H2S in a tumor-bearing nude mouse model. Therefore, we anticipate that this novel nanoprobe assembled with an electrochromic chromophore for responding to H2S and for bioimaging this molecule would have a promising prospect in biological and clinical investigations.
研究领域:
分析化学
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生物化学
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生物医学工程
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分子生物学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Chemistry
·
2024
·
IF 6.7
Xingyue You,Peng Wang,Yongke Tan,Yujing Li,Jieqiong Wang,Zixuan Li,Yuhui Ao,Ming Li
Second-order nonlinear optical (NLO) materials have become the core of photonic devices. The stability of chromophore arrangement is a key factor limiting the service life of materials. In this study, we employed a novel photo-thermal double-crosslinking networks to enhance the orientation stability of chromophore for the first time by integrating photo and thermal crosslinking techniques. Benzocyclobutene (BCB) and double bonds were introduced as crosslinked units on the polymer and chromophore, respectively. Thermal crosslinking is achieved through the Diels-Alder (D-A) reaction between BCB, while photo crosslinking is accomplished via a thiol-ene click reaction. The UV–vis spectra results demonstrate that photo-thermal double-crosslinking can provide a certain level of protection to the chromophore against decomposition at elevated temperature. Maximum electro-optic coefficient ( r 33 ) of BCB-based double-crosslinking networks is 23.3 p.m. V −1 (at 1.3 μm, 25 wt%). Little difference is observed between the results of photo-thermal double-crosslinking polymer ( r 33 = 5.8 pm V −1 , 10 wt%) and host-guest polymer ( r 33 = 6.7 pm V −1 , 10 wt% ), illustrating that the double-crosslinking reaction does not impair r 33 . The analysis of the thermal simulated depolarization (TSD) curve indicates that the orientation stability of the double-crosslinked network structure (T peak = 162 °C) is significantly enhanced compared to single thermal crosslinking (T peak = 158 °C) or single photo crosslinking (T peak = 144 °C), owing to the dual fixation of the chromophore through both photo and thermal crosslinking processes. It could be concluded that the enhancement of orientation stability does not come at the cost of the electro-optic coefficient. In a word, photo-thermal double-crosslinked second-order nonlinear materials are expected to be a promising option to research NLO optical applications.
研究领域:
材料科学
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光学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2020
·Vol. 11
·期 17
·3046-3053
·
IF 5.342
Zhitao Li,Dong Wang,Daniele Ramella,Hong Gao,Hui Cao,Yuzhen Zhao,Zongcheng Miao,Zhou Yang,Wanli He
A series of novel polysiloxane compounds possessing third-order non-linear optical properties were synthesized using PMMS (poly[3-mercaptopropylmethylsiloxane]) as the main chain structure. The electron-rich alkyne side chain containing a dialkylamine substituent was grafted to the backbone via a thiol–ene click polymerization followed by a Sonogashira cross-coupling reaction. The donor–acceptor chromophores were inserted into the side chain of the polymer by a [2 + 2] click reaction allowing the molecule to have a broader absorption in the visible and near-infrared regions and a narrower optical band gap. After the click reaction, the polymer undergoes a transition from reverse saturation absorption to saturable absorption (RSA-SA). All polymers displayed good solubility and photophysical properties, and were thermally stable. Z-Scan experiments showed that all compounds possess unique non-linear optical properties.
研究领域:
材料科学
·
高分子化学
·
非线性光学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2024
·
IF 7.6
Xinyu Liu,Jianlong Wang
Ionizing radiation (mainly including gamma ray and electron beam) technology provides a more efficient and ecological option for dye-containing wastewater treatment, which is supported by its successful achievements in industrial-scale applications. However, the degradation pathway of triphenylmethane dyes by radiation technology is still unclear. In this study, crystal violet (CV) was selected as representative cationic triphenylmethane dye, the decolorization and degradation performance by electron beam radiation technology was systematically evaluated. The results showed that CV can be efficiently decolorized and mineralized by radiation, and its degradation kinetics followed the first-order kinetic model. The effect of inorganic anions and chelating agents commonly existed in dye-containing wastewater on CV decolorization and total organic carbon (TOC) removal was explored. Quenching experiments, density functional theory (DFT) calculation and high performance liquid chromatography mass spectrometry (HPLC-MS) analysis were employed to reveal CV decolorization and degradation mechanism and pathway, which mainly included N-demethylation, triphenylmethane chromophore cleavage, ring-opening of aromatic products and further oxidation to carboxylic acid, and mineralization to CO 2 and H 2 O. Additionally, electron beam radiation/PMS process was explored to decrease the absorbed dose required for decolorization and degradation, and the synergetic effect of radiation with PMS was elucidated. More importantly, the findings of this study would provide the support for treating actual dyeing wastewater by electron beam radiation technology.
研究领域:
环境科学
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化学工程
·
辐射化学
·
水处理
·
废水管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2023
·
IF 5
Yongming Zeng,Tianchi Xu,Xiao-Fang Hou,Jiang Liu,Changqing Liu,Zhaosen Chang,Jianglin Fang,Dongzhong Chen
To achieve convenient storage of bioactive materials such as protein enzymes (proteases) at ambient temperature, with both their spatial structure and biocatalytic activity well retained, is highly appealing but challenging. Herein, a variety of amphiphilic random copolymers have been well synthesized via reversible addition–fragmentation chain transfer (RAFT) copolymerization of sulfobetaine methacrylate (SBMA) and various length fluoroalkyl methacrylate monomers. By simultaneously introducing fluoroalkyl and zwitterionic segments in random copolymerization, such kinds of amphiphilic random copolymers combined the advantages of both polyzwitterionic and fluoropolymers, which were capable of constructing uniform tiny single-chain nanoparticles (SCNPs) of around 10 nm in a wide range of compositions and fabrication conditions from aqueous solutions. Through intramolecular self-folding of the fluorinated alkyl segments to constitute the compact inner cores and the superhydrophilic zwitterionic SBMA polymer segments forming the outer passivated layer, the thus obtained SCNPs exhibited remarkable enzyme stabilizing capability through morphological adjustment, hydration, and heterocoagulation mechanisms for the investigated glucose oxidase (GOx) and horse radish peroxidase (HRP), acting like artificial molecular chaperones. Moreover, enzyme catalytic activity enhancement in the HRP@SCNPs system was well demonstrated with a representative enzyme-catalyzed cascade oxidization reaction for the synthesis of an azobenzene chromophore. Therefore, this work provides a facile fabricating strategy for SCNPs from well-synthesized amphiphilic random copolymers via RAFT, which may serve as promising stabilizers for ambient temperature storage and activity preservation of proteases.
研究领域:
聚合物化学
·
生物化学
·
材料科学
·
纳米技术
✓ 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）