JOURNAL OF THE CHINESE CHEMICAL SOCIETY
·
2017
·Vol. 64
·期 11
·1354-1359
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IF 0.935
Wangping Huang,Jinhui Li,Fei Han,Guoping Zhang,Rong Sun,Ching-Ping Wong
High-purity, large-aspect-ratio, and well-dispersed copper nanowires (CuNWs) with an average diameter of 45 nm and length >100 μm were successfully synthesized by reducing a Cu(II) salt with glucose, with oleylamine (OM) and oleic acid (OA) serving as dual capping agents, through hydrothermal reduction. A systematic study of the effects of the copper salt, capping agents, reductant, and temperature on the morphology of CuNWs has been conducted. Our results indicate that CuNWs with different diameters can be obtained using different copper salts. The diameter of the as-prepared CuNWs decreases with increasing amounts of OM/OA and glucose but increases with the increasing temperature of the reaction. By adjusting the experimental parameters, we could achieve controlled synthesis of CuNWs and obtain high-quality CuNWs with different diameters of 45, 76, 85, 90, 100, 112, 135, and 175 nm.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Yao Jin,Chao Li,Ning Zhang,Yaoxing Li,Kai Han,Shaofeng Song,Mingwang Pan,Zhicheng Pan
While waterborne polyurethanes (WPUs) have been applied to a broad range of fields, poor hydrophobic, water-resistant, and mechanical properties still limit their further development. Herein, we report a novel WPUs by an elaborate molecular design that 1 H,1 H,2 H,2 H,3 H,3 H-tridecafluoro-1-nonanol (TFN) was used as a capping agent at the end of the polyurethane chain, and polydimethylsiloxane (PDMS) used as a soft segment in the middle of the chain to synergistically enhance its properties. The TFN at the end of the polyurethane chain broke through the chain movement limitation, largely improving the surface hydrophobicity of coating, realizing the change from hydrophilic to hydrophobic with the water contact angles increased from 88.5° to 128.6°. PDMS as the soft segment increased the phase separation of polyurethane due to the thermodynamic immiscibility, improving the mechanical properties without sacrificing the hydrophobicity. Meanwhile, the water-resistant performance was also improved with the incorporation of PDMS. As a result, the hydrophobicity, water-resistance, and mechanical properties of as-synthesized WPUs coating can be improved simultaneously through the sophisticated molecular design, thus offering the potential to expand their applications.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Symmetry-Basel
·
2023
·Vol. 15
·期 7
·1334
·
IF 2.7
Guolin Song,Chengzhu Shen,David Bassir,Qiulin Li
In this study, a facile strategy of regulated self-assembly synthesis of Mn-MIL-100, using sodium acetate (CH3COONa) as a mono-dentate ligand capping agent (CA), was proposed. The as-prepared product is denoted Mn-MIL-100-CA. The coordination modulation of CH3COONa, led by its interference in the connectivity and symmetry of the metal centers and organic nodes, plays a vital role in the synthesis process. The crystallinity, morphology, topology, and properties of such MOF products were improved, since the self-assembly process of Mn-MIL-100-CA was promoted and regulated effectively. The materials were systematically characterized via XRD, SEM, N2isotherms, XPS, and TGA in terms of crystallization behavior, morphology, topology, chemical composition, and thermal and water stability. The ability of Mn-MIL-100 and Mn-MIL-100-CA to remove methylene blue (MB) from an aqueous solution was investigated using a UV–vis spectrophotometer. The results indicate that with the addition of a molar ratio of 50% CH3COONa, Mn-MIL-100-CA particles developed a regularly symmetrical morphology, i.e., ‘spherical pyramid-like structure’ crystals with a dimension of 2~5 μm. Their specific surface area and pore volume increased by 59.2% and 56.7%, respectively. The increased proportion of Mn3+implies reduced crystal defects and improved crystal structural order and integrity, and therefore an enhanced water stability. Mn-MIL-100-CA exhibited excellent adsorption performance towards MB from aqueous solution. The equilibrium adsorption value was as high as 1079.9 mg/g, which is 44.7% higher than that of Mn-MIL-100 without the addition of CA. The good adsorption capacity and excellent water stability mean that Mn-MIL-100-CA has great potential for the practical removal of MB dye pollutants from water.Keywords:metal organic frameworks;Mn-MIL-100;capping agent;symmetry;self-assembly;methylene blue adsorption
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2020
·Vol. 10
·期 9
·1624
·
IF 4.324
Haian Xia,Jiahuan An,Weizi Zhang
The metal–support interaction (MSI) has a remarkable effect on the catalytic properties, but how to precisely modulate its degree remains a huge challenge. Herein, polyvinylpyrrolidone (PVP) with three different molecular weights (MWs) (24, 58, and 130 kDa) was used as a capping agent to fabricate Ag nanoparticles (NPs) supported on ZrO2. The physiochemical properties of the catalysts were characterized by X-ray diffraction (XRD), Transmission Electron Microscope (TEM), X-ray Photoelectron Spectroscopy (XPS), and Fourier transform infrared (FT-IR) techniques. The impacts of MSI on the catalytic activity and reaction kinetics for aerobic oxidation of 5-hydroxymethylfurfural (HMF) were investigated. The results showed that the introduction of PVP with various MWs could efficiently tailor the interfacial interactions and charge transfers (CT) among PVP, the support, and Ag NPs, thereby affecting the oxidation activity of HMF. The turnover number (TON) for HMF oxidation decreases in the order of unsupported colloidal Ag clusters > Ag/ZrO2(58,000) > Ag/ZrO2(130,000) > Ag/ZrO2(24,000) > Ag/ZrO2. The reason for this large difference in the catalytic activity for HMF oxidation is that various MWs of PVP result in a change of MSI, thereby facilitating CT from PVP to Ag metal sites. This study offers a new strategy for modulating MSI by varying the MW of capping agents, thereby tuning the catalytic properties in the oxidation of HMF.Keywords:metal–support interaction;molecular weight;capping agent;PVP;HMF oxidation
研究领域:
催化
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材料科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Liang Ma,Xinyi Cai,Zhongli Liang,Shun Lu,Pengxuan Wu,Songbai Qiu,Qian Zhang,Tiejun Wang
In this work, a facile method to tune the carbon dioxide (CO2) reduction reaction (CRR) activities of graphitic carbon nitride (GCN) was developed via the capping-agent-free involvement of a trace amount of Ag nanocrystals with a decreased size. After the optimization of experimental conditions, the CRR performance investigation confirms that Ag-GCN-0.2 exhibited a superior CRR performance, achieving a faradaic efficiency (FE) of more than 72 ± 1% for CO in a wide potential range from −0.6 to −1.1 V (vs reversible hydrogen electrode (RHE)) and a max FE of 89 ± 1% at an overpotential of 0.9 V with a constant current density and a well-maintained microstructure even after 12 h of electrolysis. This work provides a new route to tune the catalytical performance of GCN and pave the way for the rational design, synthesis, and accurate estimation of the GCN-based catalysts, which will be synthesized on a large scale and utilized in industries.
研究领域:
材料科学
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催化
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2025
·
IF 7.9
Fei Duan,Jiangtao Hao,Hua Zhang,Jindong Liu,Yan Guo,Cheng Zhang,Ankun Xie,Kellen Mitchell,Lily Raymond,Sai Ma,Lei Liu,Yifei Jin,Danyang Zhao
Single-component blocked polyurethane (BPU) elastomers have garnered significant interest in three-dimensional (3D) printing due to their controllable reactivity, environmental friendliness, and storage stability. However, their extremely slow curing rates significantly limit practical applications. Existing 3D printing strategies primarily incorporate additional components to enhance material printability, which increases formulation complexity, fails to fundamentally address the issue of slow curing, and in some cases compromises mechanical properties. To address this challenge, we develop an ultrafast-curing BPU (UBPU) elastomer through reactivity-optimized formulation design, achieving additive-free processing. The UBPU system attains a gelation time of approximately 3.15 min at the deblocking temperature, representing a 28.6-fold faster curing rate relative to conventional BPU systems. The UBPU also demonstrates a high evaporation rate of the blocking agent. Accordingly, we propose a progressive curing-enabled extrusion printing (PCEEP) method, wherein the UBPU elastomer is preheated in extruder to further accelerate blocking agent evaporation during layer-by-layer deposition, thereby enabling the rapid stabilization of printed structures. This enhanced evaporation mechanism improves tensile strength of as-printed UBPU parts by 2-fold compared to cast-molded counterparts. Our study provides an additive-free strategy and novel insights into high-performance thermosetting polyurethane (TSPU) elastomers for advanced 3D printing applications.
研究领域:
材料科学
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高分子科学
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增材制造
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化学工程
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale
·
2021
·Vol. 13
·期 39
·16726-16733
·
IF 7.79
Lu-Ming Wang,Jia-Kai Chen,Bin-Bin Zhang,Qi Liu,Yang Zhou,Jie Shu,Zuoshan Wang,Naoto Shirahata,Bo Song,Omar F. Mohammed,Osman M. Bakr,Hong-Tao Sun
Cesium tin halide (CsSnX3, where X is halogen) perovskite nanocrystals (NCs) are one of the most representative alternatives to their lead-based cousins. However, a fundamental understanding of how to regulate the growth kinetics of colloidal CsSnX3 NCs is still lacking and, specifically, the role of surfactants in affecting their growth kinetics remains incompletely understood. Here we report a general approach for colloidal synthesis of CsSnX3 perovskite NCs through a judicious combination of capping agents. We demonstrate that introducing a small amount of zwitterionic phosphatidylcholine in the reaction is of vital importance for regulating the growth kinetics of CsSnX3 NCs, which otherwise merely leads to the formation of large-sized powders. Based on a range of experimental characterization, we propose that the formation of intermediate complexes between zwitterionic phosphatidylcholine and the precursors and the steric hindrance effect of branched fatty acid side-chains of phosphatidylcholine can regulate the growth kinetics of CsSnX3, which enables us to obtain CsSnX3 NCs with emission quantum yields among the highest values ever reported. Our finding of using zwitterionic capping agents to regulate the growth kinetics may inspire more research on the synthesis of high-quality tin-based perovskite NCs that could speed up their practical applications in optoelectronic devices.
研究领域:
材料科学
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纳米技术
·
化学
·
光电子学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2024
·
IF 3.7
Zhenbin Zhang,Tanlong Xue,Mingli Qin,Yanzhao Wang,Qi Shi,Lulu Wang,Yanhong Zhao,Zhimin Yang
We synthesized silver nanoplates using the solvothermal method and, for the first time, placed them as crystal seeds in a water-based growth solution, thereby successfully achieving the large-scale production of silver nanoplates. The synthesis method enabled independent control of the lateral size and vertical size of the silver nanoplates. More specifically, the lateral size could be adjusted within the range of 565 nm–1.682 μm, while the vertical size was achieved by introducing Cl– as a capping agent and the vertical size was thickened from 18.28 to 40.41 nm.
研究领域:
纳米技术
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材料科学
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化学
✓ 已验证
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 11
·1-10
·
IF 2.533
Di Jing,Gai Xikun,Jamakanga Ropafadzo,Lou Jie,Zhu Minzhi,Li Yin,Yang Ruiqin,Ma Qingxiang
To investigate the correlation between electrochemical performance and physicochemical properties, three types of 1D WO 3 nanostructures were fabricated by hydrothermal method using K 2 SO 4 , Na 2 SO 4 , and (NH 4 ) 2 SO 4 as capping agents. Hexagonal phase was obtained with the assistant of Na 2 SO 4 and (NH 4 ) 2 SO 4 , while monoclinic phase was developed using K 2 SO 4 as agent. WO 3 nanostructures prepared by (NH 4 ) 2 SO 4 and Na 2 SO 4 exhibited superior specific capacitance (400 F/g and 388 F/g) relative to WO 3 prepared by K 2 SO 4 (259 F/g), suggesting hexagonal phase is more suitable for energy storage. The nanostructures prepared using Na 2 SO 4 exhibited inferior rate performance compared with those obtained by (NH 4 ) 2 SO 4 due to low specific surface area and high crystallinity. The electrochemical performance demonstrated nanostructures prepared by (NH 4 ) 2 SO 4 was surface-controlled whereas those using Na 2 SO 4 and K 2 SO 4 were battery-type material. These findings raise the prospects of developing tungsten oxide for energy storage. Graphical abstract
研究领域:
材料科学
·
电化学
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纳米技术
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能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）