JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Cheng Xie,Fuyi Sun,Xunke Zhao,Cui Wu,Yuanyuan Che
A transient hot-wire method was used in this work to measure the thermal conductivities of methyl 2-methyl-3-nitrobenzoate (MMN) + acetonitrile, N-bromosuccinimide (NBS) + acetonitrile, and MMN + NBS + acetonitrile in the temperature range of T = (300–340) K. For binary systems, measurements were made for the mass fractions of MMN (ω1) range from 0 to 0.45 and the mass fractions of NBS (ω2) range from 0 to 0.30. For the ternary system, measurements were carried out with the ω1 + ω2 range from 0 to 0.45. The expanded uncertainties of the experimental data were estimated to be 2%, while the confidence level was 0.95 (k = 2). The experimental data were correlated as a function of the mass fraction and temperature using a linear thermal conductivity model. The maximum absolute relative deviation between the experimental values and the calculated results from the fitting model were 0.60, 0.16, and 1.30%.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 17
·
IF 1.64
Chun-Hui Du,Xu-Min Ma,Chun-Jin Wu,Mei-Qiang Cai,Li-Guang Wu
A poly(methyl methacrylate) (PMMA)- b -poly[2-( N,N -dimethylamino) ethyl methacrylate] (PDMAEMA) block copolymer was successfully synthesized by a reversible addition–fragmentation chain-transfer method. The resulting copolymer was used to prepare poly(vinylidene fluoride) blend membranes via a phase-inversion technique. The polymorphism, structure, and properties of the blend membranes were investigated by Fourier transform infrared spectrometry, scanning electron microscopy (SEM), ζ potential analysis, and filtration. The results indicate that PMMA- b -PDMAEMA could migrate onto the surface of the membrane during the coagulation process, and more of the β-crystal phase appeared with the increase of the block copolymer in the membranes. The surface morphology and cross section of the membranes were also affected by the copolymer, as shown by SEM. The ζ-potential results show that the surface charges of the membrane could be changed from positive to negative at an isoelectric point as the pH increased. The blend membrane also exhibited good pH sensitivity, and its water flux showed a great dependence on pH. The filtration experiment also indicated that the blend membrane had good hydrophilicity and antifouling properties. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40685.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 6
·4137-4146
·
IF 1.395
Yan-Ling Luo,Xiao-Li Yang,Feng Xu,Ya-Shao Chen,Zhuo-Ma Ren-Ting
A novel A 2 BA 2 -type thermosensitive four-armed star block copolymer, poly( N -isopropyl acrylamide) 2 - b -poly(lactic acid)- b -poly( N -isopropyl acrylamide) 2 , was synthesized by atom transfer radical polymerization and characterized by 1 H-NMR, Fourier transform infrared spectroscopy, and size exclusion chromatography. The copolymers can self-assemble into nanoscale spherical core–shell micelles. Dynamic light scattering, surface tension, and ultraviolet–visible determination revealed that the micelles had hydrodynamic diameters ( D h ) below 200 nm, critical micelle concentrations from 50 to 55 mg/L, ζ potentials from −7 to −19 mV, and cloud points (CPs) of 34–36°C, depending on the [Monomer]/[Macroinitiator] ratios. The CPs and ζ potential absolute values were slightly decreased in simulated physiological media, whereas D h increased somewhat. The hydrophobic camptothecin (CPT) was entrapped in polymer micelles to investigate the thermo-induced drug release. The stability of the CPT-loaded micelles was evaluated by changes in the CPT contents loaded in the micelles and micellar sizes. The MTT cell viability was used to validate the biocompatibility of the developed copolymer micelle aggregates. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 4137–4146, 2013
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ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Ning-Ya Wang,Yi-Hong Liu,Xiao-Jie Jiang,Hui-Li Guo,Li-Xiao Wang,Bei-Bei Li,Xue Liu,Xiao-Bo Zheng,Jing-Yu Pang,Dong-Bin Dang,Yan Bai
The catalytic activity of single-atom catalysts (SACs) is strongly influenced by their local coordination environment. In this study, a series of Mn-N-C SACs with tunable coordination structures were synthesized via pyrolysis of Mn-doped metal-organic frameworks (MOFs) at different temperatures. High-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and X-ray absorption spectroscopy (XANES and EXAFS) confirmed the atomic dispersion of Mn and the formation of Mn-N 4 moieties as the active sites. Among the catalysts, Mn-NC-1000°C with high Pyridine-N content exhibited the best performance, achieving a maximum Faradaic efficiency (FE) of 94.9% for CO at –0.47 V vs. RHE in an H-type cell, along with a current density of ∼15 mA . cm −2 . And in a flow cell, the current density increased significantly to ∼100 mA . cm −2 while maintaining high CO selectivity (FE CO =95%) and operational stability (24 h). The density functional theory (DFT) studies further reveal that the Mn-NC-1000°C with high Pyridine-N content effectively reduces the reaction barriers for the formation of *COOH and thus accelerates the reduction of CO 2 .This work provides a controllable strategy for regulating the coordination microenvironment of SACs and offers valuable insights for the development of efficient CO 2 electroreduction system.
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JOURNAL OF SURFACTANTS AND DETERGENTS
·
2014
·Vol. 17
·期 4
·727-732
·
IF 1.352
Zhou Yan,Cheng Yun,Han Chunyu,Lai Junling,Sui Lin,Luo Genxiang
A straightforward synthetic strategy to an anionic gemini surfactant having both N -acylamide and carboxylate groups in a molecule has been demonstrated. The surface properties of the anionic gemini surfactant, such as CMC (critical micelle concentration), C 20 (the concentration required to reduce the surface tension of the solvent by 20 mN / m), γ
CMC (the surface tension at the CMC), ∏
CMC (the surface pressure at the CMC), Γ
max (the maximum surface excess concentration at the air/aqueous solution interface), A
min (the minimum area per surfactant molecule at the air/water interface), and the CMC/C 20 ratio (a measure of the tendency to form micelles relative to adsorbtion at the air/water interface), have been studied. The influence of the different concentrations of NaCl on the surface properties of the gemini surfactant has been discussed. The results have shown that the CMC values decreased with an increase in the concentration of NaCl indicating that the Na + preferentially adsorbs onto the surface of the charged aggregate and facilitates the aggregate growth by suppressing the main impediment of electrostatic repulsion among head groups. Additionally, the values of Γ
max are always higher in salt solutions as compared to those in pure water due to their salting out effect. The larger pC 20 value indicates that the surfactant adsorbs more efficiently at the air/water interface and reduces surface tension more efficiently. In addition, the geminis in water show little or no break in their specific conductance versus surfactant molar concentration plots. This is attributable to protonation of the carboxylate group and strong Na + release during micellization.
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JOURNAL OF POROUS MATERIALS
·
2020
·Vol. 27
·期 5
·1455-1466
·
IF 2.183
Yuan Zhishuai,Cheng Yuchun,Ma Shoutao,Jiang Zhen,Zhou Yisi,Wang Yingjun,Zhang Wei,Suo Yanhua
A new method called Instant Exactness Synthesis (IES), which was applied to prepare SAPO-11 molecular sieve, was introduced innovatively. The metal–acid bifunctional Ni/SAPO-11-IES catalyst with a Ni content of 4% was prepared by the impregnation method. Ni/SAPO-11-H catalyst was prepared as a comparative sample through the traditional hydrothermal method. In addition, the growth mechanism was used to explain the excellent performance of catalyst prepared by IES method in detail. The structure of Ni/SAPO-11-IES was confirmed via XRD and TEM characterization. The pore structure of the molecular sieve was determined by nitrogen adsorption and desorption. 29 Si MAS NMR measurement was used to illustrate multiple silicon environment which supported the excellent acidity in NH 3 -TPD measurement. Furthermore, the favourable dispersibility of Ni species was proved by the mapping of the elements and EDS. Benefiting from the superior performance of materials, Ni/SAPO-11-IES catalyst exhibited a higher catalytic performance for n-heptane hydroisomerization with n-heptane conversion of 82% and isoheptane selectivity of 86%, respectively, compared with other catalysts in the same system. The study also provides new ideas for the preparation of molecular sieve materials.
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COLLOIDS AND SURFACES B-BIOINTERFACES
·
2026
·
IF 5.9
Shumin Zhang,Li Xu,Yusi Wang,Wenhao Yang,Cheng Zhou,Jianda Xu
Surface biofouling of cotton gauze dressings greatly promotes biofilm formation and delays wound healing. Herein a reversibly thermoresponsive switchable biointerface strategy is proposed to regulate the antibacterial and antifouling activity of cotton dressings for promoting wound healing. Poly(ethylene glycol) (PEG) brushes are covalently grafted onto cotton fibers to form a durable antifouling underlayer, followed by in situ polymerization of poly(N-isopropylacrylamide) (PNI) and subsequent chlorination to generate N-halamine antibacterial groups of N-Cl. In the initial antibacterial state, the outer chlorinated PNI layer releases available active chlorine upon bacterial contact, enabling fast disinfection and efficient biofilm disruption. After chlorine consumption, the PNI recovers its thermosensitive structure and collapses at wound-relevant temperature, exposing the PEG brushes underlayer and switching the interface to an antifouling state. The resulting dressing exhibited rapid and rechargeable antibacterial activity, effective biofilm disruption, excellent biocompatibility, and markedly accelerated healing of infected wounds. This bilayer architecture provides a practical route to reconcile rapid disinfection with sustained antifouling at wound biointerface.
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DIAMOND AND RELATED MATERIALS
·
2026
·
IF 5.2
Zhen Meng,Huoxing Huang,Shurui Xu,Hang Chen,Xiaobo Fu,Junling Tu,Baizeng Fang,Wenbo Liao,Guoyu Zhong
Precise monitoring is of great significance for diabetes management. In contrast to enzyme-based glucose sensors, nonenzymatic ones offer advantages such as improved stability, higher sensitivity, and reduced manufacturing expenses. In the present research, nitrogen-doped carbon nanotube-encapsulated cobalt particles (Co@NCTs-800) were synthesized via a high-temperature pyrolysis and applied to high-efficiency glucose detection. This material benefits from a large number of Co 4+ active sites formed by electrooxidation, along with the high surface area and conductivity of the N-doped carbon nanotube matrix. As a result, Co@NCTs-800 showed outstanding electrocatalytic properties, achieving remarkable sensitivity reaching up to 141.3 μA mM −1 cm −2 , a rapid response duration of merely 1.9 s, along with a minuscule detection threshold of 2.3 μM. The sensor also demonstrated strong resistance to various interfering substances, good stability and reproducibility (RSD = 3.24%). Furthermore, reliable glucose detection in real beverage samples confirmed the practical applicability of the proposed sensor. The successful fabrication of cobalt particles encapsulated in nitrogen-doped carbon nanotubes offered in-depth understanding regarding the advancement of highly efficient non-enzymatic electrochemical glucose sensing.
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FOOD CHEMISTRY
·
2026
·
IF 10.4
Qian You,Wenhong Gao,Zhong Han,Xin-an Zeng,Linlin Ye,Yuwen Huang,Yunqi Zhang,Ji Ma
Rapid and accurate quantification of total volatile basic nitrogen (TVB-N) is required to evaluate the freshness of meat products. In this study, a multichannel fluorescence sensing system was constructed by means of two pH-responsive fluorescent dyes and four amine-specific recognition metal nanoclusters as recognition elements. Besides, a continuous fluorescence spectrum was reconstructed by the six-channel fluorescence spectra based on the characteristic response of TVB-N molecules. And a chemometric model was used to establish the quantitative relationship between the reconstructed spectra and TVB-N values. The results indicated that the LS-SVM model exhibited the best performance ( R 2 = 0.951, RMSE = 1.04 mg/100 g). Moreover, this approach enabled accurate detection of TVB-N through simple sample pretreatment in complex food matrices and was successfully applied to the freshness monitoring of beef, chicken, sea bass, and shrimp. This is of great benefit to the rapid and accurate detection of freshness of meat products in cold-chain.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2026
·
IF 3.1
Shijie Tang,Sen Wen,Haiyang Feng,Kesan Yang,Haichuan Li,Shenwen Fang
The highly efficient air flotation hydrocyclone separation technology has been gradually promoted and applied. However, the performance of flocculant reported in the literature needs improvement. In this study, a novel flocculant was synthesized using poly[N-(3-dimethylaminopropyl)methacry] (PDPM) and polyether monoamine (PMA) as the main raw materials. The synthesis conditions of the flocculant were optimized based on the oil removal rate. It was found that when PMA M-2095 was used, the resulting product, Cl-0.4-P-0.2-2095, exhibited the best flotation-flocculation oil removal performance. At a dosage of 20 mg/L and a treatment time of 7 min, the oil removal rate of Cl-0.4-P-0.2-2095 reached 90.63%, which was 31.7% higher than that of the reported flocculant. Mechanistic investigations, including measurements of surface tension, interfacial tension, zeta potential, and interfacial elastic modulus, as well as oil-coated bubble experiments, revealed that Cl-0.4-P-0.2-2095 adsorbs onto the surfaces of bubbles and oil droplets. This adsorption enhances the collision and adhesion efficiency between bubbles and oil droplets, thereby improving the flotation-flocculation oil removal performance. This study provides a novel treatment agent for the efficient treatment of produced water from offshore oilfields.
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INORGANIC CHEMISTRY COMMUNICATIONS
·
2026
·
IF 5.4
Fan Wang,Yu Zhang,Hu Zhou,Chunfeng Meng,Yanxin Qiao,Biao Hu
Ni-ZIF-67 nanocrystals are hydrothermally grown on polydopamine (PDA) spheres, followed by pyrolysis to yield N-doped carbon sphere-supported NiCo alloy nanoparticles (NiCo@NCS). Systematic characterizations demonstrate that Ni doping is crucial for promoting the electrocatalytic activity toward hydrogen evolution reaction (HER). The NiCo@NCS catalyst exhibits high HER performance, achieving a low overpotential of 276 mV at 10 mA cm −2 , a favorable Tafel slope of 110 mV dec −1 , and exceptional stability. This performance enhancement originates from the synergistic coupling of homogeneously dispersed NiCo alloy nanoparticles, accelerated charge transfer kinetics, and hierarchical pore structure.
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CARBOHYDRATE POLYMERS
·
2026
·
IF 12.5
Shanshan Li,Lixin Xia,Shuo Wang,Ruibao Ju,Zi Han,Xiansen Lv,Baoqin Han,Jinhua Chi
Acute liver injury (ALI) caused by acetaminophen (APAP) has a high incidence rate worldwide, and severe cases may cause liver failure or even death. N -acetylcysteine (NAC), as an effective treatment drug approved for clinical application in ALI, has limitations such as a short half-life and the requirement for high-dose injections. Consequently, it is imperative to optimize new administration method of NAC and promote alternative therapeutic strategies for ALI. Herein, hydrogel patches ONC composed of oxidized chondroitin sulfate (OCS) and NAC-grafted CMCS were developed, and their reparative effects on APAP-induced ALI were investigated. ONC hydrogels exhibited excellent biocompatibility and appropriate biodegradability, and favorable hemostatic effects in the liver. In vitro experiments demonstrated that ONC could promote the proliferation and migration of hepatocytes, as well as the angiogenesis of HUVECs. By establishing an APAP-induced ALI model in mice, liver enzymes after ONC hydrogel patches treatment recovered to near-normal levels. Moreover, histological examination, RT-qPCR, and transcriptome sequencing results demonstrated that ONC patches could reduce the expression of inflammatory factors and apoptosis in the liver, while simultaneously activating antioxidant-related signaling pathways, thereby promoting the regeneration and functional repair of damaged tissues. Therefore, ONC hydrogel patches may be a promising alternative strategy for treating ALI.
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