排序方式: 共有5条查询结果,搜索用时 0 毫秒
1
1.
Paul G. Mezey 《Journal of mathematical chemistry》2009,45(2):550-556
Based on a comparison of nuclear charges combined with a convexity property of Hamiltonians, and employing nuclear charge
transformations representing a limited case of the Universal Molecule Model, simple electronic energy relations are obtained
for the unit cells of polymeric boron–nitrogen analogues of carbon-based nanoneedles and spiral graphite structures. 相似文献
2.
Guang Sheng GUO Fu Bo GU Zhi Hua WANG Hong You GUO 《中国化学快报》2005,16(8):1101-1104
Owing to the important role of dimensionality in the properties of nanomaterials, various types of 1D nanostructured materials, including metals and alloys, inorganic oxides, inorganic salts and polymers have been synthesized and their novel properties were also extensively studied in the recent years1-5. Various preparation methods towards diverse 1D-nanomaterials, including templating methods, catalytic growth, electrochemistry, chemical vapor deposition, solution-based solvothermal treatmen… 相似文献
3.
From crystalline V2O5 to nanostructured vanadium oxides using aromatic amines as templates 总被引:1,自引:0,他引:1
Nanoneedles, nanorods of B-VO2, and vanadium oxide nanotubes with high crystallinity were synthesized via a one-step hydrothermal treatment using crystalline V2O5 as a precursor and aromatic amines (C6H5-(CH2)n-NH2 with n=0, 1, 3) as structure-directing templates. Samples were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), thermal analysis, nitrogen adsorption/desorption isotherms and infrared spectroscopy. Nanoneedles, 0.5-5 μm in length and about 50 nm in average diameter and VO2(B) nanorods about 20-100 nm wide and up to 2.5 μm long, have been obtained. The inner and the outer diameters of the vanadium oxide nanotubes vary, respectively, between 15-25 and 70-100 nm with a length up to 4 μm. 相似文献
4.
This study presents a simple method to fabricate superhydrophobic surface based on ZnO nanoneedles. ZnO nanoneedles had been constructed on zinc layers by immersing in an aqueous NH4OH solution at 80 °C. The ZnO films were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. The ZnO films exhibited excellent superhydrophilicity (contact angle for water was 0°), while they changed wettability to superhydrophobicity with a water contact angle greater than 150° after further chemical modification with n-dodecanoic acid. The procedure reported here only needs readily available reagents and laboratory equipments, which can be applied to various substrates of any size and shape. 相似文献
5.
Xin Zi Yajiao Zhou Li Zhu Qin Chen Yao Tan Xiqing Wang Dr. Mahmoud Sayed Dr. Evangelina Pensa Dr. Ramadan A. Geioushy Dr. Kang Liu Dr. Junwei Fu Prof. Emiliano Cortés Prof. Min Liu 《Angewandte Chemie (International ed. in English)》2023,62(42):e202309351
Electrocatalytic CO2 reduction reaction (CO2RR) to multi-carbon products (C2+) in acidic electrolyte is one of the most advanced routes for tackling our current climate and energy crisis. However, the competing hydrogen evolution reaction (HER) and the poor selectivity towards the valuable C2+ products are the major obstacles for the upscaling of these technologies. High local potassium ions (K+) concentration at the cathode's surface can inhibit proton-diffusion and accelerate the desirable carbon-carbon (C−C) coupling process. However, the solubility limit of potassium salts in bulk solution constrains the maximum achievable K+ concentration at the reaction sites and thus the overall acidic CO2RR performance of most electrocatalysts. In this work, we demonstrate that Cu nanoneedles induce ultrahigh local K+ concentrations (4.22 M) – thus breaking the K+ solubility limit (3.5 M) – which enables a highly efficient CO2RR in 3 M KCl at pH=1. As a result, a Faradaic efficiency of 90.69±2.15 % for C2+ (FEC2+) can be achieved at 1400 mA.cm−2, simultaneous with a single pass carbon efficiency (SPCE) of 25.49±0.82 % at a CO2 flow rate of 7 sccm. 相似文献
1