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应用光亮镀镍组光剂的几个问题 被引量:1
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作者 唐春华 《材料保护》 CAS CSCD 北大核心 1990年第3期30-31,共2页
长期以来,人们应用光亮镀镍添加剂以单独添加为主,给生产带来添加繁琐、组份失控、成本增高等弊端。为了改革传统方法,笔者早在1984年首先提出将初级光亮剂、次级光亮剂、润湿剂三者按科学配比组合添加(简称组光剂),公开报导后,引起同... 长期以来,人们应用光亮镀镍添加剂以单独添加为主,给生产带来添加繁琐、组份失控、成本增高等弊端。为了改革传统方法,笔者早在1984年首先提出将初级光亮剂、次级光亮剂、润湿剂三者按科学配比组合添加(简称组光剂),公开报导后,引起同行的重视,相继沿用,并为国内研制市售组光剂提供了某些依据。通过长期生产表明,组合添加优于单独添加。1.添加方便,槽液稳定;2.消耗量低(比单独添加减少3~5倍),分解产物少,槽液处理周期长(平常以电解和过滤为主);3.质量稳定,经济效益高。尽管如此,笔者根据生产经验,提出几个问题与同行商讨,可望组光剂更趋完善,为提高我国装饰防护电镀水平,创造有利条件。 展开更多
关键词 镀镍 组光剂
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Mechanism and application on sulphidizing flotation of copper oxide with combined collectors 被引量:23
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作者 Wan-zhong YIN Qian-yu SUN +3 位作者 Dong LI Yuan TANG Ya-feng FU Jin YAO 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2019年第1期178-185,共8页
The effect of sodium butyl xanthate (NaBX) and dodecylamine (DDA) as combined collector on the sulphidizing flotation of copper oxide was investigated by flotation test, fluorescent pyrene probe, zeta potential, and i... The effect of sodium butyl xanthate (NaBX) and dodecylamine (DDA) as combined collector on the sulphidizing flotation of copper oxide was investigated by flotation test, fluorescent pyrene probe, zeta potential, and infrared spectroscopy analyses. The micro-flotation results show that combined use of NaBX+DDA yields better effect than using NaBX at pH 7-11 only, and the optimal molar ratio of NaBX to DDA is 2: 1. The actual ores flotation shows that when the dosage of NaBX+DDA is (100+54) g/t, the copper concentrate grade and recovery are 15.93% and 76.73%, respectively. The fluorescent pyrene probe test demonstrates that the NaBX+DDA can reduce the micelle concentration in the pulp. The zeta potential and the infrared spectroscopy analyses indicate that chemical adsorption, hydrogen-bonding and electrostatic interaction can help to adsorb NaBX+DDA on the surface of malachite. Meantime, copper xanthate and copper-amine complexes may be generated during the adsorption process. 展开更多
关键词 copper oxide combined collector FLOTATION ADSORPTION infrared spectroscopy
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Spectral Shift of π→π^* Transition for p-Nitroaniline Based on a New Expression of Nonequilibrium Solvation Energy
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作者 季健 任海生 +1 位作者 马建毅 李象远 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2014年第2期181-188,I0003,I0004,共10页
According to the nonequilibrium solvation theory studies, a constrained equilibrium principle is introduced and applied to the derivations of the nonequilibrium solvation energy, and a reasonable expression of the spe... According to the nonequilibrium solvation theory studies, a constrained equilibrium principle is introduced and applied to the derivations of the nonequilibrium solvation energy, and a reasonable expression of the spectral shift of the electronic absorption spectra is deduced. Furthermore, the lowest transition of p-nitroaniline (pNA) in water is investigated by time-dependent density functional theory method. In addition, the details of excited state properties of pNA are discussed. Using our novel expression of the spectral shift, the value of -0.99 eV is obtained for π→π^* transition in water, which is in good agreement with the available experimental result of -0.98 eV. 展开更多
关键词 Nonequilibrium solvation theory Spectral shift Solvent reorganization energy Constrained equilibrium
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Ti_(3)C_(2) MXene co-catalyst assembled with mesoporous TiO_(2) for boosting photocatalytic activity of methyl orange degradation and hydrogen production 被引量:6
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作者 Huapeng Li Bin Sun +3 位作者 Tingting Gao Huan Li Yongqiang Ren Guowei Zhou 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 2022年第2期461-471,共11页
Photocatalytic degradation and hydrogen production using solar energy through semiconductor photocatalysts are deemed to be a powerful approach for solving environmental and energy crisis.However,the biggest challenge... Photocatalytic degradation and hydrogen production using solar energy through semiconductor photocatalysts are deemed to be a powerful approach for solving environmental and energy crisis.However,the biggest challenge in photocatalysis is the efficient separation of photo-induced carriers.To this end,we report that the mesoporous TiO_(2)nanoparticles are anchored on highly conductive Ti_(3)C_(2)MXene co-catalyst by electrostatic self-assembly strategy.The constructed mesoporous TiO_(2)/Ti_(3)C_(2)composites display that the mesoporous TiO_(2)nanoparticles are uniformly distributed on the surface of layer structured Ti_(3)C_(2)nanosheets.More importantly,the as-obtained mesoporous TiO_(2)/Ti_(3)C_(2)composites reveal the significantly enhanced light absorption performance,photo-induced carriers separation and transfer ability,thus boosting the photocatalytic activity.The photocatalytic methyl orange degradation efficiency of mesoporous TiO_(2)/Ti_(3)C_(2)composite with an optimized Ti_(3)C_(2)content(3 wt%)can reach 99.6%within 40 min.The capture experiments of active species confirm that the·O_(2)-and·OH play major role in photocatalytic degradation process.Furthermore,the optimized mesoporous TiO_(2)/Ti_(3)C_(2)composite also shows an excellent photocatalytic H2 production rate of 218.85μmol g^(-1)h^(-1),resulting in a 5.6 times activity as compared with the pristine mesoporous TiO_(2)nanoparticles.This study demonstrates that the MXene family materials can be applied as highly efficient noble-metal-free co-catalysts in the field of photocatalysis. 展开更多
关键词 Mesoporous TiO_(2) Electrostatic self-assembly Ti_(3)C_(2)MXene CO-CATALYST Photocatalytic degradation Photocatalytic hydrogen production
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Triangular Halogen Bond and Hydrogen Bond Supramolecular Complex Consisting of Carbon Tetrabromide, Halide, and Solvent Molecule: A Theoretical and Spectroscopic Study
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作者 Yu-jie Wu Xiao-ran Zhao +1 位作者 Hai-yue Gao Wei-jun Jin 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2014年第3期265-273,共9页
The theoretical calculation and spectroscopic experiments indicate a kind of triangular three bonding supramolecular complexes CBr4…X^-…-H-C, which consist of carbon tetrabromide, halide, and protic solvent molecule... The theoretical calculation and spectroscopic experiments indicate a kind of triangular three bonding supramolecular complexes CBr4…X^-…-H-C, which consist of carbon tetrabromide, halide, and protic solvent molecule (referring to dichloromethane, chloroform and acetonitrile), can be formed in solution. The strength of halogen and hydrogen bonds in the triangular complexes using halide as common acceptor obeys the order of iodide〉bromide〉chloride. The halogen and hydrogen bonds work weak-cooperatively. Charge transfer bands of halogen bonding complexes between CBra and halide are observed in UV-Vis absorption spectroscopy in three solvents, and then the stoichiometry of 1:1, formation constants K and molar extinction coefficients ε of the halogen bonding complexes are obtained by Benesi-Hildebrand method. The K and ε show a dependence on the solvent dielectric constant and, on the whole, obey an order of iodide〉bromide〉chloride in the same solvents. Furthermore, the C-H vibrational frequencies of solvent molecules vary obviously with the addition of halide, which indicates the C-H…X- interaction. The experimental data indicate that the halogen bond and hydrogen bond coexist by sharing a common halide acceptor as predicted by calculation. 展开更多
关键词 Halogen bond Hydrogen bond HALIDE Carbon tetrabromide Charge transfer
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