期刊文献+
共找到5篇文章
< 1 >
每页显示 20 50 100
速率常数-秩分析法在化学反应过程分析中的应用 被引量:5
1
作者 朱仲良 余苓 +2 位作者 宋卫峰 梅雨 李通化 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2001年第5期734-738,共5页
针对化学反应动力学谱 -吸收光谱组成的两维数据 ,提出了以优化速率常数而消去反应物波谱信息为减秩手段的速率常数 -秩分析法 (RCRA) .结果表明 ,RCRA在一次优化过程中可同时获得两个最优解 ,分别对应于两步速率常数 .在获得动力学参... 针对化学反应动力学谱 -吸收光谱组成的两维数据 ,提出了以优化速率常数而消去反应物波谱信息为减秩手段的速率常数 -秩分析法 (RCRA) .结果表明 ,RCRA在一次优化过程中可同时获得两个最优解 ,分别对应于两步速率常数 .在获得动力学参数的前提下 ,利用最小二乘回归可解出包括中间体在内的各组分的吸收光谱 .该方法用于处理苯胺电解降解的两维数据 ,发现苯胺降解过程中有一种表观中间体存在 。 展开更多
关键词 速率常数-秩分析法 动力学谱-光谱 两维数据 苯胺 降解动力学 化学反应过程分析
下载PDF
Development and Application of Ultrafast Circular Dichroism Spectroscopy Techniques
2
作者 Tong Cui Menghui Jia +5 位作者 Peicong Wu Ke Hu Xueli Wang Sanjun Zhang Haifeng Pan Jinquan Chen 《Chinese Journal of Chemical Physics》 SCIE EI CAS CSCD 2024年第4期449-460,I0093,共13页
Chirality hold broad applications in life sciences,quantum devices,and various other areas.Traditionally,molecular chirality can be characterized by using steady-state circular dichroism spectroscopy.However,the techn... Chirality hold broad applications in life sciences,quantum devices,and various other areas.Traditionally,molecular chirality can be characterized by using steady-state circular dichroism spectroscopy.However,the techniques that can characterize excited state chirality are progressively capturing the public interest as it can provide the dynamic information for chirality generation and transfer.In this review,we focus on the theoretical background and the developmental history of femtosecond time-resolved circular dichroism spectroscopy(TRCD)techniques around the world.Additionally,we provide examples to showcase the utility of these techniques in the analysis of the dynamical molecular chemical structures,the investigation of molecular chirality generation,and the detection of electron spin dynamics in semiconductor quantum dots. 展开更多
关键词 Excited state chirality Femtosecond time-resolved circular dichroism spectroscopy Ultrafast dynamics Chiral spectra
下载PDF
Adsorption Reaction Dynamics of Systems Lysozyme and Nanodiamond/Nanosilica at pH=7-13
3
作者 赵(吴)为克 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2013年第3期295-302,I0003,I0004,共10页
Adsorption reactions between surfaces of nanodiamond and nanosilica with diameter of 100 nm prepared as suspension solutions of 0.25μg/μL and lysozyme molecule with different concentrations of 7 mmol/L PPBS at pH=7,... Adsorption reactions between surfaces of nanodiamond and nanosilica with diameter of 100 nm prepared as suspension solutions of 0.25μg/μL and lysozyme molecule with different concentrations of 7 mmol/L PPBS at pH=7, 9, 11, and 13 have been investigated by fluores- cence spectroscopy. Adsorption reaction constants and coverages of lysozyme with different concentrations of 0-1000 nmol/L under the influences of different pH values have been ob- tained. Helicities and conformations of the adsorbed lysozyme molecules, free spaces of every adsorbed lysozyme molecule on the surfaces of nanopartieles at different concentrations and pH values have been deduced and discussed. The highest adsorption capabilities for both sys- tems and conformational efficiency of the adsorbed lysozyme molecule at pH=13 have been obtained. Lysozyme molecules can be prepared, adsorbed and carried with optimal activity and helicity, with 2 and 10 mg/m2 on unit nanosurface, 130 and 150 mg/g with respect to the weight of nanoparticle, within the linear regions of the coverages at around 150-250 nmol/L and four pH values for nanodiamond and nanosilica, respectively. They can be prepared in the tightest packed form, with 20 and 55 mg/m2, 810-1680 and 580-1100 mg/g at threshold concentrations and four pH values for nanodiamond and nanosilica, respectively. 展开更多
关键词 Protein adsorption Interracial reaction dynamics Fluorescence spectroscopy Single molecular spectroscopy BIOCHIP PROTEOMICS
下载PDF
利用减秩因子分析法同时优化确定化学反应级数和速率常数 被引量:2
4
作者 朱仲良 程文治 +1 位作者 赵怡 夏骏 《分析化学》 SCIE EI CAS CSCD 北大核心 2003年第7期820-823,共4页
通过对反应过程中在线测得的动力学谱 光谱二维数据矩阵进行主成分分析 ,可确定化学反应过程存在的组分数。提出用优化动力学参数 减秩因子分析法解析二维数据矩阵 ,对未知动力学模型的复杂反应可同时优化求解第一步反应的级数和速率... 通过对反应过程中在线测得的动力学谱 光谱二维数据矩阵进行主成分分析 ,可确定化学反应过程存在的组分数。提出用优化动力学参数 减秩因子分析法解析二维数据矩阵 ,对未知动力学模型的复杂反应可同时优化求解第一步反应的级数和速率常数。模拟二维数据验证了该方法的可行性。该方法用于高锰酸钾氧化溴化钠的反应过程中测得的二维数据的解析 ,结果表明 :高锰酸钾的还原过程符合 0级反应模型。 展开更多
关键词 减秩因子分析法 优化 化学反应级数 速率常数 化学反应动力学 动力学谱-光谱二维数据矩阵
下载PDF
Photocatalytic debromination of decabromodiphenyl ether by graphitic carbon nitride 被引量:8
5
作者 SUN ChunYan CHEN ChunCheng +1 位作者 MA WanHong ZHAO JinCai 《Science China Chemistry》 SCIE EI CAS 2012年第12期2532-2536,共5页
The graphitic carbon nitride(g-C3N4) is found to be an efficient photocatalyst for the reductive degradation of decabromodiphenyl ether(BDE209) under UV irradiation(>360 nm).g-C3N4 was prepared by heating dicyandia... The graphitic carbon nitride(g-C3N4) is found to be an efficient photocatalyst for the reductive degradation of decabromodiphenyl ether(BDE209) under UV irradiation(>360 nm).g-C3N4 was prepared by heating dicyandiamide.X-ray diffraction,X-ray photoelectron spectroscopy,and UV-vis spectra were used to characterize the properties of as-prepared catalysts.The photoreductive degradation kinetics of BDE209 was further investigated under different reaction conditions.The degradation of BDE209 is a stepwise process,and the bromines at meta positions are much more susceptible to remove than those at the ortho and para positions.A possible photoreductive mechanism was also proposed. 展开更多
关键词 PHOTOREDUCTION BDE209 g-C3N4 environmental pollution
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部