JOURNAL OF SOLUTION CHEMISTRY
·
2013
·Vol. 42
·期 9
·1782-1793
·
IF 1.128
Lu Jia,Li Shu’ni,Zhai Quanguo,Jiang Yucheng,Hu Mancheng
The mean activity coefficients for CsCl in N -methylformamide or urea ( w ) + H 2 O (1 − w ) systems were determined in this work by potentiometry, using ion-selective electrodes at 298.15 K. The value of mass fraction w was varied between 0.00 and 0.40 in five unit-steps and the molality of CsCl was between 0.0020 and 1.4009 mol·kg −1 . The experimental data have been correlated with the Pitzer, modified Pitzer and the extended Debye–Hückel equations. The resulting values of the mean activity coefficients, the osmotic coefficients and the standard Gibbs energy of transfer, together with the Pitzer ion-interaction parameters ( β
(0) , β
(1) and C
φ ), extended Debye–Hückel parameters ( a , c and d ), and modified Pitzer parameters ( b , B
MX , C
MX ) are reported for the investigated systems.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2023
·
IF 3.8
Xiaoxue Zhang,Shuman Xu,Jing Hao,Xiaojin Xie,Fengqiu Chen,Dang guo Cheng
Single-crystalline hierarchical ZSM-5 zeolites with different particle sizes (namely 100, 140, and 200 nm) were successfully prepared by adjusting the amount of tetrapropylammonium hydroxide (TPAOH), and investigated in n -heptane catalytic cracking reaction. Diffusional measurements by zero-length column (ZLC) method showed that the apparent diffusivities of n -heptane decreased with the reduction of particle size, indicating the existence of surface barriers. Moreover, with the decrease of particle size, the additional diffusion path length increased, which meant the influence of surface barriers became more apparent. Despite the change of surface barriers, the intracrystalline diffusion still dominated the overall diffusion. Catalytic performance showed that the zeolite with smaller particle size had better stability.
研究领域:
催化化学
·
材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF PROTEOME RESEARCH
·
2024
·
IF 3.8
Huohuan Tian,Ze Tao,Wanli Zhang,Yuzhe Chen,Tao Su,Xinyuan Wang,Hao Yang,Hao Cai,Shuyun Liu,Yi Zhang,Yong Zhang
Human plasma proteomic and glycoproteomic analyses have emerged as an alternate avenue to identify disease biomarkers and therapeutic approaches. However, the vast number of high-abundance proteins in plasma can cause mass spectrometry (MS) suppression, which makes it challenging to detect low-abundance proteins (LAP). Currently, immunoaffinity-based depletion methods and strategies involving nanomaterial protein coronas have been developed to remove high-abundance proteins (HAP) and enhance the depth of plasma protein identification. Despite these advancements, there is a lack of systematic comparison and evaluation of the qualitative and quantitative effects of different strategies on the human plasma proteome and glycoproteome. In this study, we evaluated the performance of four depletion methods including combinatorial peptide ligand libraries (CPLL), Top 2, Top 14, and the nanomaterial protein corona formed by magnetic nanoparticles (MN) in both plasma proteomics and N-glycoproteomics. Compared to the CPLL, Top 2, and Top 14 strategies, the MN approach significantly increased the number of identified peptides and proteins. However, it demonstrated a relatively lower efficacy in identifying intact N-glycopeptides and N-glycoproteins. In contrast, the immunoaffinity-based depletion methods are better suited to glycoproteomics due to higher identification numbers. We believe that this work provides valuable insights and options for various research objectives, as well as clinical applications.
研究领域:
生物化学
·
医学
·
蛋白质组学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL PAPERS
·
2016
·Vol. 70
·期 7
·888-897
·
IF 1.326
Yin Zhou,Rui-Ren Tang,Dan Song
N -hydroxyphthalimide (NHPI) combined with stable and recoverable transition metal–aluminium binary hydrotalcite-like compounds (M-Al HTLcs, M = Cu, Ni, Co) as an unprecedented catalytic system was demonstrated for the allylic carbonylation, as the model reaction, of cyclic olefins with tert-butyl hydroperoxide (TBHP), using isophorone (IP) to ketoisophorone (KIP). The results showed NHPI combined with Cu-Al HTLcs to be an efficient catalytic system and the influences of various reaction conditions of the catalytic reaction were optimised. A maximum IP conversion of 68.0 % with 81.8 % selectivity to KIP was afforded under the optimal reaction conditions. Experiments of repeatability and restorability showed Cu-Al HTLcs to be stable for at least five cycles without noticeable loss of catalytic activity. Expanding substrates could also be efficiently converted to the corresponding ketones under the optimised reaction conditions with appreciable yields. A plausible catalytic reaction mechanism was proposed.
研究领域:
化学
·
催化科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Yong Chen,Panwei Yu,Guoyuan Ren,Qiang Zhang,Qiuxia Han,Hongni Teng
Antibacterial modification of polymers with potent biocides via an efficient and universal approach is very desirable in both academia and industry. A polysiloxane with both quaternary ammonium and N-chloramine was prepared via a facile three-step synthetic route. Poly(methylhydrosiloxane) (PMHS) was first reacted with 2-(dimethylamino)ethyl acrylate to introduce an ending tertiary amine that was subsequently quaternized with 3-(3-chloropropyl)-5,5-dimethylhydantoin (CPDMH). The 5,5-dimethylhydantoin moiety was then transformed into its N-chloramine counterparts by chlorination with tert-butyl hypochlorite to produce quaternary ammonium (quat)/N-chloramine polysiloxane. The CO2-philic quat/N-chloramine polysiloxane was interpenetrated into polyethylene terephthalate (PET) in supercritical carbon dioxide (scCO2) and formed a 70 nm biocidal layer. The synthetic procedures and interpenetration results were characterized with Fourier transform infrared spectroscopy (FTIR), 1H NMR, scanning electron microscopy (SEM), and X-ray photoelectron spectrocsopy (XPS). The incorporation of quaternary ammonium and N-chloramine exhibited improved synergetic biocidal performance against Staphylococcus aureus and Escherichia coli, providing a complete kill of a 7-log reduction of both species within a contact time of 10 min. The polysiloxane interpenetration layer was stable and the rechargeability of lost chlorine was good when the layer was subjected to repeated washing, storage, and UV irradiation. This modification procedure uses ecologically responsible CO2 as solvent and is expected to be applicable to substrates of other chemistry since it does not rely on chemical linkage.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2018
·Vol. 10
·期 5
·619-626
·
IF 4.927
Houbo Zhou,Christopher M. Plummer,Huaan Li,Huahua Huang,Pengfei Ma,Le Li,Lixin Liu,Yongming Chen
Previously, we developed amination modification of polyethylene by metal-free organocatalytic reaction. Here, we applied this chemistry to modify isotactic polypropylene (PP) to investigate the regioselectivity to different carbons. Specifically, this reaction was conducted in tetrachloroethane at 100 °C under a nitrogen protection where C–N bonds were selectively generated from the tertiary C–H bonds of the PP backbone in the presence of N-hydroxyphthalimide (NHPI) and bis(2,2,2-trichloroethyl) azodicarboxylate (BTCEAD). The grafting content of BTCEAD was as high as 4.7 units per 100 propylene units. Thus, a methodology for the regioselective post-functionalization of PP without metal catalysts has been developed. The obtained PP-g-BTCEAD was sequentially used as an atom transfer radical polymerization (ATRP) macro-initiator to graft polymers, such as polystyrene (PS) and poly(methyl) methacrylate (PMMA). The grafting polymerization was unequivocally proved by multiple characterization methods. The graft copolymers were applied as phase compatibilizers to improve blending of PP with PS and PMMA.
研究领域:
高分子化学
·
材料科学
✓ 已验证
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Na Jin,Xiao Yang,Yong Li,Wanjing Lai,Hailin Jiang,Yanghua Li,Kuo Liu,Yimeng Cai,Linjie Zhang,Lili Han
Hydrogen, characterized by its high energy density, efficiency, and environmentally benign output, emerges as a promising alternative to fossil fuels. However, the development of robust hydrogen oxidation reaction (HOR) catalysts for efficient energy conversion remains a significant challenge. Herein, a NiRu nanoalloy catalyst supported on N-doped hollow carbon nanocages (NiRu/NC) is synthesized via a tandem pyrolysis method. The NiRu/NC catalyst exhibits superior alkaline HOR activity, achieving diffusion-limited current density of 2.56 mA cm–2 and maintaining stability for 80,000 s with a decay rate of only 5.9%, compared to a 28.7% decay rate for benchmark Pt/C after 35,000 s. Additionally, it demonstrates remarkable resistance to CO poisoning, with the current density decreasing by only 50.7% after 1800 s, while the current density of Pt/C dropped to 0 after 800 s. Density functional theory calculations indicate that Ni in the NiRu nanoalloy effectively modulates the electron distribution, thereby ameliorating the electronic structure and enhancing the adsorption of reaction intermediates. These optimizations endow NiRu/NC with both favorable hydrogen-binding energy (HBE) and hydroxyl-binding energy (OHBE), leading to improved HOR efficiency. This work not only offers an innovative approach for synthesizing high-performance alloy-based HOR catalysts but also deepens the fundamental understanding of the bimetallic synergistic mechanisms in HOR catalysis.
研究领域:
材料科学
·
电催化
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2017
·
IF 9.446
Guoxiang Yang,Haibo Yin,Wenhua Liu,Yuping Yang,Quan Zou,Liulin Luo,Huiping Li,Yuning Huo,Hexing Li
The hybrid Ag/TiO 2 -N photocatalyst was prepared via a supercritical solvothermal process in ethanol fluid. The simultaneous achievement of reduction of Ag + ions and N-doping in silver-ammonia complex solution led to the uniform distribution of Ag nanoparticles stably combined with the surface of TiO 2 -N substrate. As a result, the visible-light photocatalytic inactivation of Acinetobacter baumannii was facilitated via the enhanced visible light harvesting and the high separation efficiency of photo-induced charge carriers. By means of the main active species of O 2 − radical, the synergistic effect of Ag nanoparticles and TiO 2 -N could induce the structure change of bacteria with the leakage of K + ions as well as the mineralization of cell membrane with the elimination of self-repair function, leading to the final cell death. In comparison, the bactericidal activity of Ag nanoparticles and TiO 2 -N under UV light irradiation was due to the intrinsic efficiency and the high light harvesting, respectively. The photothermal effect of Ag nanoparticles in the near-IR light region could be possibly remained by TiO 2 -N substrate to achieve the antibacterial activity. Furthermore, Ag/TiO 2 -N photocatalyst played great bactericidal effect for kinds of bacteria, implying the applicable future to the medical disinfection.
研究领域:
材料科学
·
微生物学
·
光催化技术
✓ 已验证
DOI
高影响因子
Frontiers in Materials
·
2022
·
IF 3.985
Cao Ying,Li Wenjiao,Quan Fengyu,Xia Yanzhi,Xiong Zhong
Light-responsive hydrogel actuators show attractive biomedical applications for in vivo drug delivery tool, surgical tissue repair operation, and vascular cleaning due to its non-contact, rapid, precise, and remote spatial control of light. Conventional visible–light–responsive hydrogels contain special chemical structure or groups, and the difficulty in synthesis results in that few can be applied to fabricate visible–light–driven hydrogel actuators. In this study, based on photothermal effect, surface-modified Fe3O4 nanoparticles were incorporated into poly(N-isopropylacrylamide-acrylamide) hydrogel by UV photopolymerization, which revealed excellent green–light–responsive volume change. Under a laser irradiation of 200 mW at 520 nm, the bending angle deformation of hydrogel strips with 2.62 wt% Fe3O4 reached 107.8°. Strip-shaped hydrogel actuators could be applied to transport tiny objects. Furthermore, a boomerang-like hydrogel actuator was designed and fabricated to drive floating foam on water. By 12 cycles of continuous laser on–off irradiation to a hydrogel actuator underwater, a circular returning movement of the float was accomplished. The study on driving a float using visible–light–triggered hydrogel actuators provides a new idea for the design of light-driven biomedical devices and soft robots.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
·
2025
·
IF 4.1
Shaopeng Huang,Baodong Du,Houmao Chen,Wende Lai,Xianyou Luo,De Li,Yong Chen
Graphitic carbons are commonly used as supports for electrocatalysts. However, due to their inherent lack of active sites and surface functional groups, graphitic carbon often causes significant aggregation and migration of Pt particles when used as a support for Pt/C catalysts, resulting in decreased activity and stability during the alkaline hydrogen evolution reaction (HER) process. In this study, graphite was first etched with NaOH, followed by reaction with melamine to synthesize edge-N-doped porous graphitic carbon (NPGC) as a support for Pt-based catalysts. The porous structure and edge-N doping promote the dispersion and anchoring of Pt species, while also contributing to the reduction in Pt nanoparticle size. Consequently, the Pt/NPGC catalyst demonstrated a low overpotential of 43 mV at 10 mA·cm −2 , outperforming the unmodified Pt/GC (102 mV) and NaOH-etched Pt/PGC (49.7 mV), thus demonstrating superior HER activity. Additionally, the stability test results confirmed the exceptional stability of the Pt/NPGC catalyst. This study provides valuable insights into the design and fabrication of efficient graphitic carbon-supported Pt-based catalysts for potential applications in future hydrogen energy technologies.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Caiyi Jiang,Peng Tang,Xiaolin Shi,Li Yang,Xingyong Liu,Bo Xing,Guo Yang,Yang Luo,Dongzheng Wang,Xiaoyu Zhao
Due to high efficiency and durability, Polyvinylidene Fluoride (PVDF) membranes are promising for their application in wastewater purification. However, they still inevitably face the challenge of membrane clogging problem, restricting separation and anti-fouling performance. Herein, a novel N-MnO x @PVDF membrane with high catalytic ozonation ability was synthesized using the blending non-solvent-induced reverse transfer method, evidenced by X-ray diffraction, Fourier transform infrared spectrometer, and X-ray photoelectron spectroscopy. Compared with pristine PVDF, N-MnO x @PVDF has better hydrophilicity and reasonable pore structure, resulting in higher permeability and anti-fouling properties. After in-situ catalytic ozonation cleaning, the Flux Recovery Ratio ( FRR ) increases from 72.1% to 99.8%, and the irreversible pollution rate ( R ir ) decreases from 31.9% to 0.13%. Meanwhile, the high stability and reusability can be demonstrated from high Total Organic Carbon (TOC) removal efficiency of humic acid (HA, 93%), high FRR (94%), and low R ir (4.3%) after consecutive cycles filtration experiments. In addition, further mechanistic insights are verified by 3D-excitation Emission Matrices (EEM) and Electron Paramagnetic Resonance (EPR) characterization, demonstrating that the removal of irreversible contaminants can be mainly ascribed to indirect oxidation of 1 O 2 , and their possible generation pathway is also proposed. This study provides valuable insights into the development of advanced antifouling membranes.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Reaction Chemistry & Engineering
·
2024
·
IF 3.4
Jiahe Fan,Yao Mu,Shuairen Qian,Bozhao Chu,Siqing Zhong,Yi Cheng
The acetylene method is presently the most frequently employed technique for producing N-vinyl pyrrolidone (NVP). However, when using pyrrolidone potassium salt as the catalytically active substance in the conventional process, the water in the reaction system has a great impact on the catalyst activity and selectivity of the homogeneous process. This study comprehensively investigates the influence of water on the reaction within the conventional process of synthesizing NVP in an autoclave, and obtains a highly active homogeneous catalytic active substance through strict water removal. The main reaction and catalyst deactivation mechanisms are further clarified through DFT calculations. Based on the understanding of the mechanism, a one-step synthesis of NVP using KOH directly as the catalyst without removing water has been realized by introducing solvents into the stop-flow micro-tubing (SFMT) reactor with enhanced gas–liquid mass transfer to increase the amount of acetylene in the liquid phase.
研究领域:
化学工程
·
催化科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）