期刊：
Solar Energy Materials and Solar Cells,2012年105:174-178 ISSN：0927-0248
通讯作者：
Zeng, Ju-Lan
作者机构：
[Zeng, Ju-Lan; Sun, Li-Xian; Yan, Wen-Pei; Zhu, Fu-Rong; Zhang, Ling; Cao, Zhong; Deng, Guang-Rong; Zhu, Ling] Changsha Univ Sci & Technol, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Sch Chem & Biol Engn, Changsha 410114, Hunan, Peoples R China.;[Yu, Sai-Bo] China Tobacco Hunan Ind Corp, Changsha 410007, Hunan, Peoples R China.
通讯机构：
[Zeng, Ju-Lan] C;Changsha Univ Sci & Technol, Hunan Prov Key Lab Mat Protect Elect Power & Tran, Sch Chem & Biol Engn, Changsha 410114, Hunan, Peoples R China.
关键词：
Phase change materials;Copper nanowires;Thermal energy storage;Thermal conductivity
摘要：
The effects of copper nanowires (Cu NWs) with ultra-high aspect ratio and sponge-like structure on the properties of an organic phase change material (PCM) were investigated. Tetradecanol (TD) was selected as the organic PCM. The sponge-like Cu NWs clusters were randomly dispersed in the TD matrix and were wrapped by TD to form a new kind of composite PCM. The phase change enthalpy (6,H) of the composite PCMs was decreased linearly with the increasing of Cu NWs loading, while the melting speed was accelerated. The thermal conductivity of the composite PCMs was greatly enhanced by Cu NWs. The Delta H of the composite PCM containing 58.9 wt% (corresponding to 11.9 vol%) of Cu NWs was 86.95 J/g, and the thermal conductivity attained to 2.86 W/m K, which was nearly 9 times higher than that of the TD. The thermal conductivity enhancement of Cu NWs on the composite PCMs showed a turning point at the Cu NWs loading of 1.5 vol%. When Cu NWs loading exceeded 1.5 vol%, the thermal conductivity of the composite PCMs increased significantly faster with the increasing of Cu NWs loading. (c) 2012 Elsevier B.V. All rights reserved.
摘要：
A simple and reliable method for electrochemical determination of nitrite based on Gd doped nano titanium dioxide (Gd-nano-TiO2) modified gold electrode was well developed in this paper. Using cyclic voltammetry, the modified electrode shows electrocatalytic activity for oxidation of nitrite in 0.10 mol×L-1 sulfuric acid solution (pH=0.70). The catalytic peak current was found to be linear with nitrite concentration in the range of 2.0´10-6 ~ 2.0´10-4 mol×L-1, with a detection limit of 1.1´10-6 mol×L-1 (S/N=3). Compared with spectrophotometry, the Gd-nano-TiO2 modified Au electrode could be used for the determination of nitrate in the ham sausage samples with a satisfactory recovery of 95.9 ~ 103.2%, showing its promising application in safety evaluation for food.
作者机构：
[Deng, Ting] Cent South Univ Forestry & Technol, Sch Sci, Inst Appl Chem, Changsha 41004, Hunan, Peoples R China.;[Cao, Zhong] Changsha Univ Sci &Technol, Sch Chem & Biol Engn, Hunan Provin Key Lab Mat Protect Elect Power & Tr, Changsha 410004, Hunan, Peoples R China.;[Shen, Guoli; Deng, Ting; Cao, Zhong] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Bio Sensing & Chemomet, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Deng, Ting] C;Cent South Univ Forestry & Technol, Sch Sci, Inst Appl Chem, Changsha 41004, Hunan, Peoples R China.
会议名称：
International Conference on Chemical Engineering and Advanced Materials
会议时间：
MAY 28-30, 2011
会议地点：
Changsha, PEOPLES R CHINA
会议主办单位：
[Deng, Ting] Cent South Univ Forestry & Technol, Sch Sci, Inst Appl Chem, Changsha 41004, Hunan, Peoples R China.^[Cao, Zhong] Changsha Univ Sci &Technol, Sch Chem & Biol Engn, Hunan Provin Key Lab Mat Protect Elect Power & Tr, Changsha 410004, Hunan, Peoples R China.^[Deng, Ting;Cao, Zhong;Shen, Guoli] Hunan Univ, Coll Chem & Chem Engn, State Key Lab Chemo Bio Sensing & Chemomet, Changsha 410082, Hunan, Peoples R China.
会议论文集名称：
Advanced Materials Research
关键词：
Biosensor;Biotin;Electrochemical impedance spectroscopy (EIS);Metastable molecular complex;Plasma-polymerized film (PPF)
摘要：
An electrochemical impedance biosensor was proposed for the detection of small molecule biotin based on the plasma-polymerized films (PPF) and the bioaffinity difference between an analyte (biotin) and an analogue compound (HABA) in binding avidin. Avidin formed a metastable complex with 2-[(4-hydroxyphenyl)azo]benzoic acid (HABA) immobilized on the electrode surface. When the sensor contacts a sample solution containing biotin, the avidin was released from the sensor surface to form a more stable complex with biotin in solution. The impedance spectra change recorded is proportional to the desorbed mass of avidin, and there is a clear mathematic relationship between the impedance change and the biotin concentration. The proposed electrochemical impedance bioaffinity sensor has nice response to biotin in the range of 4.8×10-9–5.6×10-4 M. The sensor could be regenerated under very mild conditions simply by reimmersion of the sensor into a biotin solution to desorb the surplus avidin.
摘要：
A series of 13-cis-retinoate aryl derivatives were synthesized from 13-cis-retinoic acid and phenols or arylalcohol with dicyclohexylcarbodiimide (DCC) as reagent and 4-dimethylaminopyridine (DMAP) as catalyst. Their structures were characterized by 1H, 13C NMR, IR and MS. The crystal of 3a has been determined by single crystal X-ray diffraction analysis and its molecular structure has been confirmed. Compound 3a belongs to monoclinic system with space group P2 (1)/c, a = 22.235 (3) Å, b = 7.4117 (10) Å, c = 15.990 (2) Å, β = 109.253 (3) °, V = 2487.7 (6) Å3, Z = 4, R = 0.0613, ωR = 0.01437.
摘要：
A three-dimensional lithium-based metal–organic framework Li2(2,6-NDC) (2,6-NDC = 2,6-naphthalene dicarboxylate) has been synthesized solvothermally and characterized by X-ray powder diffraction, elemental analysis, FT-IR spectroscopy, thermogravimetry and mass spectrometer analysis (TG–MS). The framework has exceptional stability and is stable to 863 K. The thermal decomposition characteristic of this compound was investigated through the TG–MS from 293 to 1250 K. The molar heat capacity of the compound was measured by temperature modulated differential scanning calorimetry (TMDSC) over the temperature range from 195 to 670 K for the first time. The thermodynamic parameters such as entropy and enthalpy versus 298.15 K based on the above molar heat capacity were calculated.
作者机构：
[何德良; 谢荟; 夏三保; 高翔; 谢昕] College of Chemistry and Chemical Engineering, Hunan Univ., Changsha, Hunan 410082, China;[曹忠] Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, Changsha Univ. of Science and Technology, Changsha, Hunan 410004, China
通讯机构：
College of Chemistry and Chemical Engineering, Hunan Univ., China
摘要：
2, 6-Deoxyfructosazine (1) was synthesized from glucose and ammonium formate and isolated from the reaction mixture by membrane technology. The compound was characterized by HRMS, (HNMR)-H-1, and (CNMR)-C-13. Thermal analysis of the product showed that it began to decompose at 220 degrees C, and its weight loss was about 50% at 320 degrees C. GC/MS analysis of the tobacco smoke showed that it decomposed to produce 2-methylpyrazine, 2, 6-dimethylpyrazine and 2-ethyl-6-methylpyrazine in the smoke upon smoking.
摘要：
A novel technique to covalently immobilize indicator dyes with terminal amino groups for preparing optical sensors is investigated. Au nanoparticles are used as bridges and carriers for anchoring indicator dyes on the surface of a quartz glass slide. 1-Aminopyrene (AP) was employed as an example of indicator dyes and covalently immobilized onto the outmost surface of the glass slide. First, the glass slide was functionalized by (3-mercaptopropyl) trimethoxysilane (MPS) to form a thiol-terminated self-assembled monolayer, where Au nanoparticles were strongly anchored via covalent link. Then, 16-mercaptohexadecanoic acid (MHDA) was self-assembled to bring carboxylic groups onto the surfaces of Au nanoparticles. A further activation by using 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDC) and N-hydroxysuccinimide (NHS) converted the carboxylic group into succinimide ester. Finally, the active succinimide ester was reacted with 1-aminopyrene (AP). Thus, AP was covalently immobilized to the glass slide and an AP-immobilized sensor was obtained. The resulting sensor was used to determine rutin based on fluorescence quenching. It showed a linear response toward rutin (R) from 5.0 × 10-7 to 6.0 × 10-4 mol L-1 with a detection limit of 2.0× 10-7 mol L-1. This AP-immobilized sensor has very satisfactory reproducibility, reversibility, rapid response and no dye-leaching.
摘要：
A quantitative structure-spectrum relationship (QSSR) model was developed to simulate 13C nuclear magnetic resonance (NMR) spectra of carbinol carbon atoms for 55 alcohols. The proposed model, using multiple linear regression, contained four descriptors solely extracted from the molecular structure of compounds. The statistical results of the final model show that R 2=0.982 4 and S=0.869 8 (where R is the correlation coefficient and S is the standard deviation). To test its predictive ability, the model was further used to predict the 13C NMR spectra of the carbinol carbon atoms of other nine compounds which were not included in the developed model. The average relative errors are 0.94% and 1.70%, respectively, for the training set and the predictive set. The model is statistically significant and shows good stability for data variation as tested by the leave-one-out (LOO) cross-validation. The comparison with other approaches also reveals good performance of this method. Key wordscarbinol carbon atom– 13C nuclear magnetic resonance–chemical shift–topological indices–quantitative structure-spectroscopy relationship
摘要：
An N-tert-butyloxycarbonylated organic synthesis intermediate, (S)-tert-butyl 1-phenylethylcarbamate, was prepared and investigated by means of differential scanning calorimetry (DSC) and thermogravimetry (TG). The molar heat capacities of (S)-tert-butyl 1-phenylethylcarbamate were precisely determined by means of adiabatic calorimetry over the temperature range of 80-380 K. There was a solid–liquid phase transition exhibited during the heating process with the melting point of 359.53 K. The molar enthalpy and entropy of this transition were determined to be 29.73 kJ mol−1 and 82.68 J K−1 mol−1 based on the experimental C
p–T curve, respectively. The thermodynamic functions, [
$$ H_{T}^{0} - H_{298.15}^{0} $$
] and [
$$ S_{T}^{0} - S_{298.15}^{0} $$
], were calculated from the heat capacity data in the temperature range of 80–380 K with an interval of 5 K. TG experiment showed that the pyrolysis of the compound was started at the temperature of 385 K and terminated at 510 K within one step.
