ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Haowen Chen,Kaiyi Luo,Pingping Qian,Yixiao Deng,An Li,Qiang Sun,Lei Yang,Yuquan Liu,Zhengshang Wang,Guang-Kun Ren,Qian Cao,Jun Tang
The donor effect of polycrystalline n-type bismuth telluride (Bi2Te3) during sample preparation usually results in the peak thermoelectric figure of merit (ZT) at temperatures above 400 K, severely restricting its application in the room-temperature (RT) range. A leap in RT performance requires innovative strategies that replace conventional methods of regulating point defects with limited effectiveness. We demonstrate excellent thermoelectric performance with an RT figure of merit, ZT = 1.2, and a maximum ZT = 1.3 at 325 K, by regulating the high-potential barrier heterointerfaces composed of La2O3 nanoparticles (NPs) and Bi2Te2.7Se0.3 (BTS). The created energy barriers at grain boundaries scatter and localize carriers through O–Bi ionic bonding and O–Te hybridization, enhancing the density of states in adjacent regions and leading to a rapid rise in the RT Seebeck coefficient (from 148.67 μV K–1 to 222.84 μV K–1 at 300 K). Another aspect of La2O3 NPs, as the second term of nano-oxide, introduces multiscale defect-scattering phonons, thereby enhancing thermal performance. Finally, at temperature difference ΔT = 10 K, a maximum output voltage and power, Vmax = 239.73 mV and Pmax= 10.50 mW, can be achieved with the fabricated TE module. Our findings underscore the full potential for promoting the performance of thermoelectric materials in the lower temperature region via high-energy barrier interface engineering.
研究领域:
材料科学
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热电学
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纳米材料
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能量转换
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
·
2016
·Vol. 54
·期 12
·1145-1151
·
IF 3.318
Yating Gao,Jinxian Yang,Haiyan Fan,Yanwei Ding,Xiaodong Ye
The effect of different functional groups of methylated urea on the phase transition of poly( N -isopropylacrylamide) (PNIPAM) aqueous solutions has been studied by a high-sensitivity differential scanning calorimetry. The results reveal that with the addition of osmolytes with N H groups, the enthalpy change increases with the number of DSC cycles, presumably due to the gradual formation of hydrogen bonds with dehydrated CO groups of PNIPAM at high temperature. Moreover, with the addition of tetramethylurea (TMU) without hydrogen bond donor groups, the enthalpy change of PNIPAM solution remains unchanged with the number of DSC cycles and decreases with the TMU concentration, suggesting that the van der Waals interactions between TMU and isopropyl groups of PNIPAM and the weakening of hydrophobic interactions between isopropyl groups play a dominant role in the effect of TMU on the phase transition of PNIPAM. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54 , 1145–1151
研究领域:
高分子化学
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物理化学
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DOI
高影响因子
ACS Catalysis
·
2024
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IF 11.3
Li Jiang,Yiqian Yang,Lin Huang,Yan Zhou,Junwei An,Yuchun Zheng,Yiwei Chen,Yanhong Liu,Jianhui Huang,Ee Lui Ang,Suwen Zhao,Huimin Zhao,Rongzhen Liao,Yifeng Wei,Yan Zhang
The various isomers of hydroxyproline (HP) are widely distributed in nature, serving as key components of structural proteins, while their quaternized betaine derivatives function as osmoprotectants in many organisms. Aerobic bacteria degrade HPs through a variety of well-studied mechanisms. Recent studies show that certain anaerobic bacteria degrade HPs through distinct mechanisms, involving the O2-sensitive glycyl radical enzymes (GREs) t4L-HP dehydratase (HypD) and t4D-HP C–N lyase (HplG). Here, we report the discovery of two more GREs, N-methyl c4L-HP dehydratase (HpyG) and N-methyl c4D-HP dehydratase (HpzG), which catalyze radical-mediated dehydration of the two N-methyl-c4HP enantiomers, while also displaying significant activities toward their unmethylated substrates. Both GREs are associated with homologues of pyrroline-5-carboxylate reductase, which catalyze reduction of their products N-methyl-pyrroline-5-carboxylate to form N-methyl-proline. Crystal structures of HpyG and HpzG in complex with their substrates revealed active site architectures distinct from that of HypD and provided insights into the mechanism of enantioselective radical-mediated dehydration. Our research further expands the repertoire of diverse chemical mechanisms involved in the bacterial metabolism of highly prevalent HP isomers and derivatives in the anaerobic biosphere.
研究领域:
生物化学
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微生物学
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酶学
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DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
·
IF 14.229
Erbing Hua,Shu Jin,Xiaorong Wang,Shuang Ni,Gang Liu,Xiaoxiang Xu
In this work, novel 2D type-II p-n heterojunctions La 2 Ti 2 O 7 /In 2 S 3 have been fabricated. The heterojunctions exhibit much improved photocatalytic activity over individual moieties and their physical mixtures in which 18-fold increment in hydrogen production has been achieved under visible light illumination (λ ≥ 400 nm). Their superior activities stem from intimate face-to-face contact between La 2 Ti 2 O 7 and In 2 S 3 in the heterojunctions which guarantee facile charge interchange. Photoelectrochemical analysis suggests that efficient charge separations occur at the interfaces of the heterojunctions and contributes to a prolonged charge lifetime as well as the much enhanced photocatalytic activities. Such a simple strategy by fabricating ultrathin type-II p-n heterojunctions also warrant promising applications in other areas such as optoelectronics, sensors etc. whereby efficient charge separations are needed.
研究领域:
材料化学
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光催化
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纳米材料
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能源科学
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半导体物理
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环境催化
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可持续能源
✓ 已验证
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
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2022
·Vol. 45
·期 11
·1847-1855
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IF 3.614
Ben Chen,Haibo You,Liqun Fang,Tingting Lin,Ping Xu,Chu Chu,Shengqiang Tong
Analytical enantioseparations of five N-alkyl drugs, fluoxetine hydrochloride, labetalol, venlafaxine hydrochloride, trans -paroxol, and atropine sulfate, were investigated by reverse phase high-performance liquid chromatography with sulfobutylether-β-cyclodextrin as chiral mobile phase additive. Effects of various factors such as composition of mobile phase, concentration of cyclodextrins, and column temperature on retention and enantioselectivity were studied. Apparent formation constant between methanol, acetonitrile, and sulfobutylether-β-cyclodextrin were determined to be 2.90 × 10 −3 and 1.00 × 10 −4 L mmol −1 under 25°C using UV-spectrophotometry. Van't Hoff plots were used to investigate thermodynamic parameters for enantiomers–stationary phase interaction and formation of inclusion complex. Two retention models were employed individually for evaluation of inclusion complexation between five racemates and sulfobutylether-β-cyclodextrin. The second model with complex adsorption was more accord with the retention behavior of fluoxetine hydrochloride, labetalol, and venlafaxine hydrochloride enantiomers, while the first model was more consistent with the retention behaviors of trans -paroxol and atropine sulfate. In the selected mobile phase, stoichiometric ratio for both of inclusion complex was found to be 1:1.
研究领域:
药学
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分析化学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 50
·40437-40443
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IF 3.84
Lin Wang,Xiaomei Zhao,Yan Zhang,Wenqi Zhang,Tianrui Ren,Zhihong Chen,Feng Wang,Haifeng Yang
An intelligent PNIPAAm/AgNP composite film was fabricated by the simple assembly of silver nanoparticles on the surface of photo-polymerized PNIPAAm film via electrostatic interaction. Surface enhanced Raman scattering study and finite-difference time-domain simulation demonstrated that the local electric field intensity and the SERS intensity of this resultant composite film can be easily tuned by changing the interparticle distance triggered by temperature or solvent variations. The composite film showed a high stability in a polar organic solvent and concentrated saline solution. The smart composite film might find applications as a SERS sensor for temperature/solvent variation detection as well as a versatile SERS substrate for the detection of analyte in sea water and organic solvent.
研究领域:
材料科学
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纳米技术
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分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2021
·
IF 6.165
Tao Yang,Yukun Sun,Xianyang Meng,Jiangtao Wu,J. Ilja Siepmann
This work reports new experimental data for the density and viscosity of n -decane + CO 2 binary mixtures. A simultaneous density and viscosity measurement apparatus was redesigned using a vibrating–wire viscometer coupled with a vibrating–tube densimeter. The measurements for the pure component ( n -decane) and three different binary mixtures ( n -decane + CO 2 ), with mole fractions of n -decane of (0.4026, 0.2225, 0.1262), were carried out at temperatures ranging from (303.15 to 373.15) K and pressures up to 80 MPa. The expanded relative uncertainties ( k = 2, level of confidence = 0.95) were estimated to be 0.2% for density and 3.0% for viscosity over the entire measurement range, respectively. Densities were correlated as a function of temperature and pressure through a modified Tait–type equation with an average absolute percentage deviation less than 0.05%. To model the viscosity of the binary mixtures as a function of temperature, density, and composition, the extended hard–sphere method combined with simple quadratic mixing rules were used to describe our experimental data. Good agreement is found between experiments and correlations, which attests to the predictive capabilities of semi–empirical equations. In addition, Monte Carlo simulations in the isobaric-isothermal ensemble with the Transferable Potential for Phase Equilibria–United Atom (TraPPE–UA) force field were carried out to characterize the microscopic structure of the studied systems.
研究领域:
化学工程
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流体力学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2011
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IF 2.089
Lingling Zhang,Yongsheng Guo,Juan Xiao,Xianjie Gong,Wenjun Fang
Densities and viscosities were determined over the whole composition range for the binary mixtures of exo-tetrahydrodicyclopentadiene with n-nonane, n-dodecane, or n-tridecane at different temperatures (293.15, 298.15, 303.15, and 313.15) K and atmospheric pressure. The excess molar volumes VmE for the mixtures were calculated from the experimental data. The refractive index and surface tension of the systems were also measured for temperatures of (293.15 and 303.15) K.
研究领域:
物理化学
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材料科学
✓ 已验证
DOI
高影响因子
RUSSIAN JOURNAL OF GENERAL CHEMISTRY
·
2022
·Vol. 92
·期 10
·2119-2131
·
IF 0.779
Wang Yanyan,Chen Ruicheng,Hu Yiping,Jiao Shulin,Zou Zhihong
Abstract In this study, a novel series of 7-azaindole-1,2,3-triazole bearing N -benzamide derivatives 3a – 3r were synthesized and fully characterized by 1 H NMR, 13 C NMR, and MS. The prepared compounds were tested against A549 and HepG2 cell lines by using MTT assay in vitro anticancer activity. Compounds 3d , 3l , 3q , and 3r exhibited the most promising, with IC 50 (7.83, 7.58, 9.47, and 8.65 μM, respectively) against A549 compared with Gefitinib (IC 50 , 6.77 μM) and IC 50 (6.98, 6.69, 10.18, and 7.97 μM, respectively) against HepG2 compared with Sorafenib (IC 50 , 5.65 μM). Further molecular docking studies showed that compounds 3d , 3l , 3q , and 3r can bind well to protein targets 3LXY, 4AGD, and 3WZE, so these compounds have the potential to be developed into multi-targeted kinase inhibitor.
研究领域:
药理学
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化学
·
肿瘤学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 16
·9171-9183
·
IF 14.511
Shu Cai,Xiaoxue Zuo,Haiyan Zhao,Shengjiong Yang,Rongzhi Chen,Liwei Chen,Ruihong Zhang,Dahu Ding,Tianming Cai
Elimination of trace organic contaminants from complex environmental matrices is of great importance for environmental remediation. Herein, the efficient removal of trace antibiotics and hydrocarbons from livestock wastewater and contaminated groundwater was realized using a newly prepared N-doped carbon catalyst (PDA–gCN-1.0). Specifically, carbon nitride (g-C3N5) was synthesized and coated with polydopamine (PDA), which could inhibit the N-loss during the thermal treatment, as well as serve as an exogenous nitrogen source. The resultant metal-free catalyst PDA–gCN-1.0 (dopamine : g-C3N5 = 1 : 1) possessed abundant N configurations, and could effectively activate peroxymonosulfate (PMS) and peroxydisulfate (PDS). Typically, with 50 mg L−1 PDA–gCN-1.0 and 1 mM PMS, sulfamethoxazole (SMX, 10 mg L−1) could be completely oxidized within 5 min (k = 1.691 min−1), surpassing most state-of-the-art catalysts (e.g., Co3O4 nanoparticles, graphene oxide, activated carbon). The oxidation process was found to be dominated by the nonradical mechanism, instead of the radical species. More specifically, electron-transfer between organics and high potential C–PMS* complexes played a significant role. The transformation pathways of SMX were proposed based on the identified intermediate products, and the toxicity of the corresponding products were predicted using the ECOSAR program. Finally, the eliminations of trace antibiotics (from livestock wastewater) and hydrocarbons (from contaminated groundwater) were investigated by the developed PDA–gCN-1.0/PMS process. The much higher removal efficiencies of target organic contaminants than TOC removal efficiencies clearly demonstrated the satisfactory selectivity of the nonradical-dominated PDA–gCN-1.0/PMS process. The reduced inhibition rate of E. coli confirmed that the developed advanced oxidation process was effective for the toxicity reduction of the wastewater. The findings of this work would shed new light on the applications of metal-free catalysts in environmental remediation.
研究领域:
环境科学
·
催化化学
·
水处理工程
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Lulu Yan,Yahe Zhang,Hongyu Yan,Yu Fan,Xuxia Liu,Chao Ma,Quan Shi
CS2/N-methyl-2-pyrrolidone (NMP) could extract much more substance from coals than any other solvents. Investigation on the molecular composition of CS2/NMP extracts from lignite is significant for the understanding of high extraction yield and the clean utilization of coal. The methanol-soluble portions from lignites and CS2/NMP extracts of lignites were characterized by electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry. The yield of CS2/NMP extracts from lignite was quite higher than that of methanol extracts. Furthermore, the yield of methanol-soluble portions from CS2/NMP extracts was far more than that of methanol extracts from lignite. At the level of molecular composition, the relative content of heteroatom compounds with more oxygen atoms, longer side chain, and higher condensation in the CS2/NMP extract was also higher than that in the methanol extract. Despite great difference in the yield and the relative content of components, the distributions of species, molecular weight, carbon number, and double-bond equivalent were similar to those of most organic molecules for the methanol extract and methanol-soluble portions from the CS2/NMP extract. These phenomena suggested that organic molecules with similar structure but different composition, nonuniformly distributed in the coal matrix, were released more in the CS2/NMP extract compared to the single methanol extract.
研究领域:
能源化学
·
分析化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Yuqing Li,Sha Liu,Shan Tao,Yan Zhu,Qiming Zhao
A novel metal-free, reusable, and green catalytic system comprising hydrothermal carbon microspheres (HCMSs) supporting N-hydroxyphthalimide (NHPI) was developed and employed in the aerobic oxidation of alcohol. Hierarchically porous HCMSs with good monodispersity were produced by the hydrothermal carbonization of sucrose and designed NaOH-impregnated calcination under a static air atmosphere. The meso- and macroporous pores on HCMSs make up 71% of the total pore volume. The covalent immobilization of NHPI onto HCMSs was first accomplished by grafting hyperbranched polyquaternary amine via repetitive ring-opening reactions of diglycidyl ether and subsequent amidation with 4-carboxy-NHPI. Owing to the cocatalysis of grafted quaternary ammonium salt, a designed heterogeneous catalyst has superior performance to free NHPI in the oxidation of 2-phenylethanol. The established catalytic system achieved 42% conversion and up to 96% selectivity of acetophenone at 90 °C under 1 atm O2 for 20 h and presented a versatile catalytic effect for diversified alcohols. Immobilized NHPI could be facilely recycled via simple filtration and displayed good stability for six cycles without a discernible decrease of reactivity or damage of catalyst morphology in repeated oxidation test.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）