MOLECULES
·
2025
·Vol. 30
·期 17
·3576
·
IF 4.6
Yating Zhang,Jing Qi,Jun Xia,Fei Zhai,Liqi Dong
Organic phase change materials (OPCMs) offer high energy density for thermal storage but suffer from crystallization kinetics dependent on ambient temperature, leading to uncontrolled heat release and limited storage lifetime. Although doping OPCMs with azobenzene (Azo) derivatives enables optically controlled energy storage and release, existing systems require UV irradiation forE-to-Zisomerization. This UV dependency seriously hinders their development in practical solar applications. Herein, we develop a visible-light-responsive Azo@OPCM composite by dopingtetra-ortho-fluorinated azobenzene into eicosane. Systematic characterization of composites with different dopant ratios via UV–visible spectroscopy and differential scanning calorimetry reveals that green-light irradiation drivesE-to-Zisomerization, achieving 97–99%Z-isomer conversion. This photoisomerization could introduce supercooling through photo-responsive energy barriers generated byZ-isomer, allowing thermal energy storage at lower temperatures. Subsequent blue-light irradiation triggersZ-to-Ereversion to eliminate supercooling and enable optically controlled heat release. Additionally, by regulating the molar ratios of dopant, the optimized composites achieved 280.76 J/g energy density at 20% molar doping ratio, which surpassed that of pure eicosane and the reported Azo-based photothermal energy storage system. This work establishes a complete visible-light-controlled energy harvesting–storage–release cycle with significant potential for near-room-temperature solar thermal storage applications.
研究领域:
材料科学
·
化学工程
·
能量存储
·
光化学
·
热管理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lu Zhou,Hao Fu,Zhe Wang,Ligang Chen,Guanhua Ren,Tao Jiang,Chenjie Gu,Liyuan Liu,Wentao Zhang,Weili Zhang,Jun Zhou,Jiaguang Han
Introducing novel nanomaterials into azobenzene (AB) and its derivatives enables a remarkable influence on the molecular isomerization and thus is of great interest for a variety of applications. We systematically study the thermal and photoinduced isomerization of p -aminoazobenzene ( p AAB) directly anchored on MoS 2 /GO nanocomposites by employing in-situ and real-time surface-enhanced Raman scattering (SERS) spectroscopy. The MoS 2 /GO nanocomposite provides the enhancements for the thermal isomerization efficiency of p AAB of more than 3-fold compared with that of the bare p AAB. We also show that the MoS 2 /GO nanocomposite has little impact on the UV-induced isomerization of the p AAB, but has apparent impact on the reverse cis -to- trans isomerization of the p AAB under blue light illumination. The results reveal that the effect of MoS 2 /GO nanocomposite on the photoinduced isomerization of p AAB depends on irradiation wavelength, which can be attributed to the competing interplay of charge transfer and structural relaxation in the hybrid system composed of p AAB and MoS 2 /GO nanocomposites. The study helps elucidate how the isomerization of azobenzene molecules is affected as incorporated into nanoscale assemblies, and thus open new opportunities for the applications of the isomerization of azobenzene in complex hybrid nanodevices.
研究领域:
材料科学
·
纳米技术
·
光化学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2019
·
IF 4.507
Lingmei Yang,Shiyou Xing,Hongzhe Sun,Changlin Miao,Ming Li,Pengmei Lv,Zhongming Wang,Zhenhong Yuan
In this study, a series of Ni/SAPO-11 catalysts with different Ni loadings were prepared by citric acid-assisted impregnation for the hydroisomerization of oleic acid to iso-alkanes. Serving as a chelating ligand, citric acid first promoted the dispersion of Ni nanoparticles loaded on SAPO-11. Because of its acid properties, citric acid facilitated the removal of aluminium oxide species, contributing to the formation of a mesoporous SAPO-11 structure. A maximum of 67.3 mol% of iso-alkanes was formed using 7Ni/SAPO-11 as a catalyst under optimal conditions of 360 °C, 4 h, and 4.0 MPa H 2 . After reusing for five cycles, the catalyst still exhibited 21.5 mol% isomer selectivity. The reaction pathways and catalytic mechanisms concerning the oleic acid hydroisomerization process were proposed and discussed. The hydroisomerization of oleic acid mainly depended on the catalyst's Lewis acid sites, with the assistance of the metal centre and Brönsted acid sites. The mesoporous structure of SAPO-11 facilitated the availability of a significant number of catalytic Lewis acid sites, which, together with the highly dispersed Ni centres, contributed to the enhanced product isomerization.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2018
·
IF 4.521
Pengyu Niu,Ping Liu,Hongjuan Xi,Jun Ren,Minggui Lin,Qiang Wang,Xiaoyan Chen,Litao Jia,Bo Hou,Debao Li
The formation of centrally branched iso-dodecane was controlled by absorption modes of alkene intermediates on ZSM-22, which included pore mouth type and key lock type. In this paper, we have designed and synthesized two kinds of ZSM-22 catalysts for selective formation of iso-dodecane with branched chain at more central positions from n -dodecane hydroisomerization. Aluminosilicate ZSM-22 was modified via carbonization of template to block the micropores and borosilicate ZSM-22 was synthesized. The characterization results and performance evaluation validated that micropore blockage could limit the pore mouth type at low reaction temperatures which favored the formation of iso-dodecane with side chain near the end of the carbon chain. Owing to the weak acid strength, higher temperatures, which favored the key lock mode, were needed to run the n -dodecane hydroisomerization over Pt/borosilicate ZSM-22. Both the two strategies for catalyst design achieved key lock adsorption mode and improvement of the selectivity for centrally branched iso-dodecane. Most importantly, weak acid sites on borosilicate ZSM-22 could catalyze double-bond isomerization reactions, which enhanced centrally branched iso-dodecane distribution up to more than 47%. Our research provides a prospective strategy for selective formation of centrally branched iso-alkanes and Pt/borosilicate ZSM-22 is expected to have potential applications in n-alkane hydroisomerization.
研究领域:
催化化学
·
石油炼制
·
材料化学
·
工业化学
·
能源化学
✓ 已验证
DOI
高影响因子
Chemical Science
·
2023
·Vol. 14
·期 25
·7016-7025
·
IF 8.4
Xiuping Yin,Xinxing Li,Xuyi Li,Malgorzata Biczysko,Shourong Zhu,Jiaqiang Xu,Yue-Ling Bai
The dark-colored viologen radical cations are unstable in air and easily fade, thus greatly limiting their applications. If a suitable substituent is introduced into the structure, it will have the dual function of chromism and luminescence, which will broaden its application field. Here, Vio1·2Cl and Vio2·2Br were synthesized by introducing aromatic acetophenone and naphthophenone substituents into the viologen structure. The keto group (–CH2CO–) on the substituents is prone to isomerize into the enol structure (–CHCOH–) in organic solvents, especially in DMSO, resulting in a larger conjugated system to stabilize the molecular structure and enhance fluorescence. The time-dependent fluorescence spectrum shows obvious keto-to-enol isomerization-induced fluorescence enhancement. The quantum yield also increased significantly (T = 1 day, ΦVio1 = 25.81%, ΦVio2 = 41.44%; T = 7 days, ΦVio1 = 31.48%, and ΦVio2 = 54.40%) in DMSO. The NMR and ESI-MS data at different times further confirmed that the fluorescence enhancement was caused by isomerization, and no other fluorescent impurities were produced in solution. DFT calculations show that the enol form is almost coplanar throughout the molecular structure, which is conducive to stabilizing the structure and enhancing fluorescence. The fluorescence emission peaks of the keto and enol structures of Vio12+ and Vio22+ were at 416–417 nm and 563–582 nm, respectively. The fluorescence relative oscillator strength of Vio12+ and Vio22+ enol structures is significantly higher than that of keto structures (f value changes from 1.53 to 2.63 for Vio12+ and from 1.62 to 2.81 for Vio22+), indicating stronger fluorescence emission of the enol structure. The calculated results are in good agreement with the experimental results. Vio1·2Cl and Vio2·2Br are the first examples of isomerization-induced fluorescence enhancement of viologen derivatives, which shows strong solvatofluorochromism under UV light, making up for the disadvantage that it is easy for a viologen radical to fade in air, and providing a new strategy for designing and synthesizing viologen materials with strong fluorescence.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Omega
·
2021
·
IF 3.512
Hong Huang,Xiang-Guang Meng,Wen-Wang Yu,Li-Yu Chen,Yan-Yan Wu
The isomerization of glucose to fructose provides an important way to expand the utilization of biomass. Herein, an amidoximated polyacrylonitrile (PAO) with an amidoxime functional group was prepared and used as an active heterogeneous catalyst for the isomerization of glucose to fructose. The PAO was characterized by SEM, XPS, and FTIR. The yield of fructose reached 48.9% with a selectivity of 98.6% for a 5 h reaction in aqueous solution at an initial pH of 6.5 and 85 °C. The pH caused a great influence on the conversion of glucose and selectivity of fructose while a little effect on the yield of fructose in the range of pH 5–10. The activation energy of isomerization reaction was evaluated as 79.7 kJ·mol–1. The catalysis mechanism was proposed, and the synergistic effect of oxime and amino groups played an important role in the isomerization of glucose. PAO maintained good catalytic activity after four cycles.
研究领域:
生物化学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Liangdong Hu,Lian-hua Xu,Chenjun Yang,Longfei Hong,Kai Wu,Sheng Chu,Longlong Ma,Shurong Wang,Rui Xiao,Huiyan Zhang
Lewis acid sites (LASs) are essential for the photocatalytic isomerization of biomass into high-value platform compounds. However, transient changes in the number of LASs in a photocatalytic system have not been clearly documented, often resulting in an inaccurate understanding of their role in isomerization. To address this challenge, in this study, the molecular probes glyceraldehyde was isomerized to 1,3-dihydroxyacetone (DHA, 63.5 % yield , 3 h) and fructose (47.9 % yield , 3 h) on Pt–KC 3 N 4 , with concurrent production of H 2 (233.8 μmol g −1 ). The results of in situ NH 3 –temperature-programmed desorption (TPD) characterization demonstrated that light irradiation induced the formation of transient LASs on Pt–KC 3 N 4 , and the density of acid sites observed in this study differed significantly from that observed in offline data. Furthermore, theoretical calculations demonstrated that photothermal electron redistribution on Pt–KC 3 N 4 is the main factor driving this transient LAS formation. This report describes a unique methodology to explore transient acid sites in isomerization reactions and provides insight into potential applications in the field of photocatalytic biomass valorization.
研究领域:
化学
·
可再生能源
·
生物质转化
✓ 已验证
DOI
高影响因子
FUEL
·
2024
·
IF 6.7
Fengli Yang,Qing Xia,Guangpin Lin,Yi Su,Wei Lin,Huabing Zhang,Guobin Liang
Saccharide is the main product of biomass hydrolysis, which can be converted into high-value-added chemicals and fuels, and the isomerization of glucose to fructose is a decisive step in biomass conversion technology. In this research, the isomerization reaction of glucose catalyzed by MgCl 2 -700 in water has been studied, and the fructose yield and selectivity reached 36.4 % and 79.3 %, respectively in an aqueous system at 120 °C for 60 min. The results of electrospray ionization tandem mass spectrometry (ESI-MS) and density functional theory (DFT) show that [MgCl(aq)] + formed in an aqueous system coordinated with glucose for isomerization reaction, and the binding of C1/C2 sites of the β-glucopyranose and [MgCl(aq)] + promoted the 1,2-intramolecular hydride shift of glucose, thus rapidly converting glucose into fructose.
研究领域:
生物化学
·
催化化学
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Xiong Zhang,Haowei Li,Xuan Li,Yong Liu,Xuehui Li,Jianyu Guan,Jinxing Long
The isomerization of glucose to fructose is a crucial step in the formation of high-value biochemicals from renewable cellulosic biomass. In this work, we have demonstrated a novel and efficient strategy for the aqueous isomerization of glucose catalyzed with basic ionic liquids. At 80 °C and 30 min, a fructose selectivity and yield of 73.8% and 36.8%, respectively, are obtained in the presence of tetrabutyl ammonium proline ([N4,4,4,4]Pro). Both of these values are notably larger than those obtained in numerous other technologies, making this technique a significant step toward selective generation of fructose. Further investigation reveals that the isomerization performance of glucose is influenced by the structure and hydrophobicity of the ionic liquids, where the latter enhances glucose isomerization via the formation of a microreactor. Moreover, this process exhibits a low activation energy of 34.4 kJ mol–1 with the [N4,4,4,4]Pro ionic liquid, correlating well with the high activity of this catalytic system. In addition, this IL catalyst shows good reusability as demonstrated by the retention of satisfactory performance after four consecutive runs. Based upon the above results, we have proposed a plausible catalytic mechanism, which can be further confirmed by DFT calculations and isotopic labeling studies.
研究领域:
生物化学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS COMMUNICATIONS
·
2017
·
IF 3.33
Bing Li,Luwei Li,Qing Zhang,Weizheng Weng,Huilin Wan
Fructose is generated from glucose isomerization in water over attapulgite without any addition of metal compounds. The formation of fructose was related closely to the calcination processing of attapulgite. The highest fructose yield of 20.6% was obtained with the selectivity of 77.9% over attapulgite calcined at 500 °C. Moreover, attapulgite was characterized by BET, XRD, IR and CO 2 -TPD techniques. The results indicated that proper distribution and amount of basic sites were crucial for the selectivity of fructose as well as the structural properties of attapulgite.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
GREEN CHEMISTRY
·
2017
·Vol. 19
·期 21
·5103-5113
·
IF 9.125
Ying Duan,Min Zheng,Dongmi Li,Dongsheng Deng,Lu-Fang Ma,Yanliang Yang
The catalytic conversion of HMF to 2-hydroxy-3-methyl-2-cyclopenten-1-one (MCP), which is a valuable edible essence that has traditionally been obtained from adipic acid, was achieved with an isolated yield of 58%. This procedure comprised two steps: the hydrogenation of 5-hydroxymethylfurfural (HMF) to 1-hydroxy-2,5-hexanedione (HHD) in water on Pd/Nb2O5 catalysts and then the isomerization of HHD to MCP in the presence of a base. The Nb2O5 supports, which were acidic, were characterized by FTIR, XRD and NH3-TPD. The supported Pd/Nb2O5 catalysts, in which Pd was highly dispersed, were synthesized employing cyclohexene as a reductant and were characterized by XRD, TEM, ICP-AES, XPS, EDX and CO pulse chemisorption. The high conversion of HMF was attributed to the high dispersion of Pd, and the acidity of the supports led to high selectivity for HHD. The conversion of HHD to MCP was an intramolecular aldol condensation reaction, and the protonic solvent favored this reaction. Ca–Al was proved to be an effective solid base for the conversion of HHD to MCP in water.
研究领域:
化学工程
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
SUPRAMOLECULAR CHEMISTRY
·
2011
·
IF 1.94
Jing Cao,Jun Xiang Feng,Yong Xiang Wu,Xue Qun Pei,Jiao Jiao Yan,Yang Liu,Wen Jie Qin,Xiao Bin Zhang
A novel 15-aza-5-crown ether linked to styryl chemosensory 13-(4-((9H-fluoren-9-ylidene)methyl)-2-nitrophenyl)-1,4,7,10-tetraoxa-13-azacyclopentadecane was designed and synthesised, it would not occur during photoisomerisation under radiation of light but shows special capability of selectively recognising for Sr2+.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）