POLYMER COMPOSITES
·
2024
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IF 4.8
Zhengxiao Li,Yuemeng Sun,Linzhi Liang,Zhenliang Lu,Yanlin Xie,Beibei Dong,Xiongwei Qu,Shengli Chen
A comb-like polyacrylic superdispersant (CPS) consisting of polyacrylic acid- co -poly(isobutyl alcohol polyoxyethylene ether) (PBAT) was synthesized as a dispersant for preparing nano-calcium carbonate/PBAT (nano-CaCO 3 /PBAT) composite through internal mixing. Chemical structure analysis revealed that CPS adsorbed onto the surface of nano-CaCO 3 via coordination between carboxyl groups and calcium ions, effectively dispersing particles using a comb-shaped side chain and electrostatic repulsion. This improved compatibility between nano-CaCO 3 and PBAT resulted in enhanced crystallinity, tensile stress, and elongation at break. By incorporating only 0.4 wt% CPS into 10 wt% nano-CaCO 3 (based on PBAT weight), the dispersion of nano-CaCO 3 was significantly improved, leading to a superior two-phase interface in the composite material. Consequently (in the film's machine direction), elongation at break increased from 882 ± 49% to 1047 ± 31%, while tensile strength increased from 22.10 ± 2.06 MPa to 26.70 ± 1.14 MPa. These findings facilitate the production of high-performance PBAT composites suitable for blow molding into biodegradable films. Highlights Comb-like polyacrylic superdispersant synthesized by aqueous polymerization. Nano-CaCO 3 modified via the adsorption and dispersion of CPS. Stress and elongation of PBAT composite reinforced by CPS-modified nano-CaCO 3 . CPS-modified nano-CaCO 3 /PBAT composite films processed through blow molding. Enhancement by coordination, hydrogen-bond action, and microphase separation.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Tianxiang Luo,Jingyi Xie,Xue Li,Xiuwen Wang,Li Sun,Fanqiang Bu,Bing Zhao,Wei Kan,Yuqian He
Integrating the ethanol oxidation reaction (EOR) into hybrid water-splitting systems presents a dual advantage of reducing anodic overpotentials and co-generating high-value chemicals. Nevertheless, the rational design of catalysts that reconcile high noble-metal atom economy with robust durability remains a formidable task. Here, we report a nanobrick-structured NiO electrocatalyst decorated with highly dispersed Ru species supported on nickel foam (Ru-NiO/NF), in which no Ru nanoparticles or clusters were detected. The catalyst was synthesized via a hydrothermal process followed by ion exchange. The introduction of Ru into the NiO host lattice effectively modulates the local electronic configuration and accelerates charge-transfer kinetics, while simultaneously regulating surface hydroxyl species (OH*) and expanding the electrochemically active surface area. Benefiting from these interfacial synergies, the optimized Ru 2 -NiO/NF delivers current densities of 10 and 100 mA cm −2 at low potentials of 1.08 ± 0.01 V and 1.34 ± 0.02 V, respectively, in 1.0 M KOH containing 0.5 M ethanol, thus outperforming pristine NiO/NF. The catalyst also achieves an acetate selectivity of 96.1 % and a Faradaic efficiency (FE) of 93.8 %. Complementary experimental evidence and density functional theory (DFT) calculations elucidate that the robust electronic coupling between Ru and Ni centers optimizes the adsorption energetics of key intermediates, thereby lowering the kinetic barriers for selective ethanol-to-acetate conversion. This work offers insights into the precise manipulation of electronic states in hybrid oxides for efficient, value-added electrocatalytic applications.
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产品关联
DOI
PubMed
高影响因子
Frontiers of Chemical Science and Engineering
·
2022
·Vol. 16
·期 12
·1782-1792
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IF 4.803
Lin Yuemin,Zhang Yuanyuan,Nie Renfeng,Zhou Kai,Ma Yao,Liu Mingjie,Lu Dan,Bao Zongbi,Yang Qiwei,Yang Yiwen,Ren Qilong,Zhang Zhiguo
Ultra-dispersed Ni nanoparticles (7.5 nm) on nitrogen-doped carbon nanoneedles (Ni@NCNs) were prepared by simple pyrolysis of Ni-based metal—organic-framework for selective hydrogenation of halogenated nitrobenzenes to corresponding anilines. Two different crystallization methods (stirring and static) were compared and the optimal pyrolysis temperature was explored. Ni@NCNs were systematically characterized by wide analytical techniques. In the hydrogenation of p -chloronitrobenzene, Ni@NCNs-600 (pyrolyzed at 600 °C) exhibited extraordinarily high performance with 77.9 h −1 catalytic productivity and > 99% p -chloroaniline selectivity at full p -chloronitrobenzene conversion under mild conditions (90 °C, 1.5 MPa H 2 ), showing obvious superiority compared with reported Ni-based catalysts. Notably, the reaction smoothly proceeded at room temperature with full conversion and > 99% selectivity. Moreover, Ni@NCNs-600 afforded good tolerance to various nitroarenes substituted by sensitive groups (halogen, nitrile, keto, carboxylic, etc.), and could be easily recycled by magnetic separation and reused for 5 times without deactivation. The adsorption tests showed that the preferential adsorption of −NO 2 on the catalyst can restrain the dehalogenation of p -chloronitrobenzene, thus achieving high p -chloroaniline selectivity. While the high activity can be attributed to high Ni dispersion, special morphology, and rich pore structure of the catalyst.
研究领域:
化学工程
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催化
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材料科学
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DOI
高影响因子
ACS Applied Materials & Interfaces
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2015
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IF 6.723
Dengke Shen,Lei Chen,Jianping Yang,Renyuan Zhang,Yong Wei,Xiaomin Li,Wei Li,Zhenkun Sun,Hongwei Zhu,Aboubakr M. Abdullah,Abdullah Al-Enizi,Ahmed A. Elzatahry,Fan Zhang,Dongyuan Zhao
Immobilization of highly monodispersed palladium nanoparticles in colloidal mesoporous silica supports has been successfully achieved. The Pd nanoparticles with a uniform small size of ∼1.2 nm can be homogeneously distributed in individual mesopore channels of amino group-functionalized three-dimensional dendritic mesoporous silica nanospheres (3D-dendritic MSNSs) with a Pd content of ∼2.8%. The 3D-dendritic MSNSs-based nanoreactors show high activity in Suzuki–Miyaura cross-coupling reactions of bromobenzene with phenylboronic acid, obtaining a yield over 99% with 0.075 mol % Pd catalyst at room temperature in the dark within 12 h. More importantly, the excellent catalytic performance can be maintained with a negligible decrease lasting at least six cycles. It further reveals that the mesoporous frameworks of the colloidal silica supports can be well-preserved after four catalytic runs; meanwhile, the Pd nanoparticles in the mesopore channels also can remain the sizes of 1.5 ± 0.3 nm without significant transfer and aggregation. The unique mesostructure of the 3D-dendritic MSNSs with mesopore channels of short length and large diameter is supposed to be the key role in immobilization of active and robust heterogeneous catalysts, and it would have more hopeful prospects in catalytic applications.
研究领域:
材料科学
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催化
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2025
·
IF 5.2
Yun Zhang,Jinyu Li,Xiyu Song,Changhai Xu,Jinmei Du,Dagang Miao,Guowei Xiao,Yang Jiang
Liquid disperse dyes (LDDs) have broad prospects of application due to their advantages in environmental sustainability, public health, and energy conservation. In this work, three different polycarboxylate hyperdispersants containing solvating groups and different functional groups were successfully synthesized by free radical polymerization and used in the preparation of ECT black LDDs. After 90 days of storage, the LDDs stabilized with AHT and AST retained good stability, with respective dye particle sizes of 401 nm and 425 nm. In contrast, the particle size of LDDs stabilized with AAT was 679 nm. The absolute Zeta potential value of LDDs dispersed with AHT and AST was more than 30 mv. The rheological properties of LDDs were further characterized to study the stabilization mechanism of the LDDs. The results showed that LDDs prepared by three dispersants exhibited shear-thinning fluid behavior. LDDs dispersed with AHT and AST had higher storage modulus, loss modulus, and yield stress than that of LDDs prepared with AAT. All the LDDs showed a shear sensitivity behavior and the percentage viscosity recovery for LDDs dispersed with AHT, AAT, and AST was 94.4 %, 77.8 %, and 86.9 %, respectively. In addition, compared with commercial powder dispersion dyes, the chemical oxygen demand (COD) of residual liquid after dyeing with LDDs was reduced by more than 60 % due to less use of dispersants. Collectively, these results indicate that this study can facilitate the optimization of LDDs formulations and holds significant potential for the production of high-quality LDDs products.
研究领域:
化学工程
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材料科学
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高分子科学
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纺织工程
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
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2021
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IF 2.328
Pan Yang,Chunhui Yue,Yingnan Yang,Jingchuan Wang,Yawei Hao,Heshun Huang,Jing Zhu,Guozong Yue,Xiaochong Zhao,Lijun Yang
Transition metal compounds, as promising non-precious metal-based materials for hydrogen evolution reaction, have been limited by metal particles agglomeration. It is challenging to achieve ultra-dispersion of transition nano-metal catalysts, which would enlarge surface areas and reinforce physical stability. In this study, self-supported, highly dispersed NiMo nanobelts have been prepared by electrospinning and in-situ vacuum reduction. The unique belt structure with large active sites could facilitate the electron transfer and exhibits sufficient mechanical strength. The NiMo nanobelts show excellent HER activity, which achieve 10 mA cm −2 in 1 M KOH only required 62 mV overpotential, as well as great cycling stability.
研究领域:
材料科学
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电化学
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纳米技术
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催化
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2023
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IF 8.2
Huiyi Huang,Wenqin Lu,Qing Yang,Yanjuan Zhang,Huayu Hu,Zhenfei Feng,Tao Gan,Zuqiang Huang
Herein, a novel superdispersed calcium borate@polydopamine/cellulose acetate-laurate nanocomposite (CTAB-CB@PDA/CAL) is successfully synthesized by a double-template-regulated biomimetic mineralization strategy using PDA/CAL as a hard template and cetyltrimethylammonium bromide (CTAB) as a soft template and surface hydrophobic modifier. The results show that CB can grow uniformly on the CAL surface, and CTAB can improve the hydrophobicity of CTAB-CB@PDA/CAL due to the synergistic effect of the double templates, which contributes to the enhanced dispersibility and long-term dispersion stability of CTAB-CB@PDA/CAL in poly-alpha-olefin (PAO) base oil. Furthermore, CB can rapidly enter the friction interface due to the long substituents of CTAB and CAL, so CTAB-CB@PDA/CAL used as a lubricant additive in PAO base oil exhibits superior tribological performance compared to CB, CB/CAL, and CB@PDA/CAL.
研究领域:
材料科学
·
纳米技术
·
摩擦学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）