Authentication email has already been sent, please check your email box: and activate it as soon as possible.
You can login to My Profile and manage your email alerts.
If you haven’t received the email, please:
|
|
There are 7 papers published in subject: > since this site started. |
Results per page: |
Select Subject |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
1. Preparation and photocatalytic properties of ZnTiO3 powders | |||
Yuan Peihong,Fan Caimei,Wang Yan,Ding Guangyue | |||
Chemistry 17 December 2010 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:ZnTiO3 powders with pure hexagonal phase were synthesized by the sol-gel process using tetrabutyl titanate and zinc acetate as raw material. The composites were characterized by thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD) patterns, scanning electron microscope (SEM), energy dispersive spectrometer (EDS), X-ray photoelectron spectra (XPS). The relationship between the physicochemical property and photocatalytic activity was investigated, too. It is found that the photocatalytic activity is dependent on the phase of ZnTiO3. The product of ZnTiO3 with pure hexagonal-phase calcined at 800℃ for 2h exhibits the maximum photocatalytic activity in the photochemical degradation of humic acid under solar light irradiation. The processing parameters such as the dosage of catalysts and the light source also play an important role in tuning the photocatalytic activity. Under solar light irradiation, the humic acid of photocatalytic degradation was 100% after photocatalytic reaction continued for 1.5h with the dosage of photocatalysts was 0.8g/L. | |||
TO cite this article:Yuan Peihong,Fan Caimei,Wang Yan, et al. Preparation and photocatalytic properties of ZnTiO3 powders[OL].[17 December 2010] http://en.paper.edu.cn/en_releasepaper/content/4398627 |
2. Synthesis, Characterization and Analysis of Two Kinds of Electron Transporting Materials | |||
Jin Biao,Kang Feng | |||
Chemistry 31 March 2010 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Two kinds of electron transporting materials, 2,5-Di-p-tolyl-1,3,4-oxadiazole (1) was synthesized through condensation reaction and characterized by UV-vis, FT-IR, 1H-NMR and X-ray single-crystal determination, and 2,5-Di-p-vinylbenzene-1,3,4-oxadiazole (4) was synthesized through Wittig reaction and characterized via UV-vis, 1H-NMR and 13 C-NMR spectroscopy. The comparisons of the two compounds’ CV spectra show that the incorporation of vinyl units of compound (4) brings about particular electronic effects on electrochemical properties of molecule. The geometric and electronic structures of the two materials were optimized and their electronic absorption spectrums were calculated by Gaussian 03 software packet. The results show that compound (4) has lower LUMO energy level and is the better electron transporting material, and compound (1) has higher energy gap and is the better hole blocking material. We simulated their Uv-vis spectrums and found that the red-shift trends were almost in accordance with the experimental spectrum. Compared with compound (1), compound (4) has a red-shift which was mainly attributed to more intra-molecular charge transfer and lower energy gap. Molecular orbital coefficients analyses show that the absorption maximum corresponds to the π-π* transition. | |||
TO cite this article:Jin Biao,Kang Feng. Synthesis, Characterization and Analysis of Two Kinds of Electron Transporting Materials[OL].[31 March 2010] http://en.paper.edu.cn/en_releasepaper/content/41388 |
3. Optimization of Soxhlet extraction of capsaicinoids | |||
Shiqiang Yan,Xiaofeng Xu,Yonghong Zhou | |||
Chemistry 02 March 2009 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Soxhlet extraction of hot pepper through an orthogonal experiment (L9(34)) with both recovery of capsaicinoids and time interval as indexes were investigated to get the best extraction conditions. Integrated Balance Method was used to select the condition for conformation experiment, and two groups of conditions were chosen : A3B3C2D1 and A3B3C2D3,number as 1 and 2 respectively. Result showed that experiment 2 has a little lower recovery of capsaicinoids, but it used a shorter time. In order to improve recovery of capsaicinoids of experiment 2, extraction cycle was increased to 20 times. The recovery of capsaicinoids is close to experiment 1. The total time used is 140 min which is shorter than experiment 1. Finally, the best conditions were selected: extraction cycle, extraction temperature, volume of solvent(95%ethanol) and weight of hot pepper were 20, 140℃and 130 mL and 20g respectively. It showed that Soxhlet extraction was an efficient, economical, and easy method for extraction of capsaicinoids. | |||
TO cite this article:Shiqiang Yan,Xiaofeng Xu,Yonghong Zhou. Optimization of Soxhlet extraction of capsaicinoids[OL].[ 2 March 2009] http://en.paper.edu.cn/en_releasepaper/content/29790 |
4. Theoretical study of the interaction between CFCl3 and SO2 | |||
FangWang | |||
Chemistry 07 January 2009 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Ab initio calculations have been performed on a complex of CFCl3 with SO2. Ten stable configurations are found with no imaginary frequencies using the Møller–Plesset second-order perturbation (MP2) method. In the seven configurations, CFCl3 with SO2 connect by three non-covalent bonds, such as Cl•••O, F•••O, Cl•••S or F•••S, in the one configuration, they connect by two Cl•••S non-covalent bonds, and the other two configurations contain only one non-covalent bond. The NBO analysis has revealed that the n(Cl) → σ*(S–O) interaction gives the strongest stabilization to these complexes and the charge transfer is not main factor in the weak intermolecular interactions in these complexes. The atoms in molecules theory (AIM) has been used to analyze the nature of the interaction. The results of theoretical calculation indicate that there is the weak interaction between CFCl3 and SO2 compounds as well as Cl•••O and Cl•••S interactions occupy bigger proportion for the system. The interactions seem to be very significant as a driving force influencing the arrangement of molecules. | |||
TO cite this article:FangWang. Theoretical study of the interaction between CFCl3 and SO2[OL].[ 7 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27405 |
5. Ab initio theoretical study of the interactions between CFCs and CO2 | |||
Fang Wang ,Wang Haijun | |||
Chemistry 06 January 2009 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Ab initio calculations were carried out for system of CFCs (CFC-11, CFC-12, CFC-13) with CO2, and twelve stable configurations were obtained with no imaginary frequencies. To obtain the interaction energies of these complexes, single-point energy calculations with basis set superposition error (BSSE) correction were carried out at MP2/aug-cc-pvdz and MP2/aug-cc-pvtz levels. The analyses of charge transfer and the atoms in molecules theory (AIM) were used to analyze the nature of the interaction. The results of theoretical calculation indicate that there is the weak interaction as well as the presence of C朇l晻昈 type halogen bonding and C朏晻昈 bonds in these complexes, and which provided some information and data for studying environment problem. | |||
TO cite this article:Fang Wang ,Wang Haijun . Ab initio theoretical study of the interactions between CFCs and CO2[OL].[ 6 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27371 |
6. Spatial-temporal behaviour of non-isothermal autocatalator | |||
Xiong Xiaogen,Liu Haimiao | |||
Chemistry 20 May 2008 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:In this paper the observation on homogeneous kinetics and reaction-diffusion system of a non-isothermal autocatalator was summarized. A new region of ‘mixed-mode’ oscillations has been found. Both the period-doubling and mixed-mode regions of this model can support spiral waves, and some types of complex structures exist in the region where the homogeneous kinetics undergoes a period-doubling bifurcation and the structures are different from other models which have the same homogeneous kinetics. | |||
TO cite this article:Xiong Xiaogen,Liu Haimiao. Spatial-temporal behaviour of non-isothermal autocatalator[OL].[20 May 2008] http://en.paper.edu.cn/en_releasepaper/content/21553 |
7. The analysis of chemical features in the core promoter of Escherichia coli | |||
Xiaohui Wang,Hongli Zhai | |||
Chemistry 19 March 2008 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:The characteristics of DNA sequence, such as intrinsic curvature, bendability, staking energy, propeller etc., are highly correlated with their chemical properties of molecular structure. In this work, the core promoter sequence of Escherichia coli (E. coli) was translated into digital signals with chemical properties for the first time, and wavelet analysis was employed to find out the chemical features of the core promoter sequence. Results of this investigation confirmed the vital role of characteristic modules -10 region and -35 region in regulation, and their possible reaction pathways and positions were discussed. Furthermore, a novel feature was discovered firstly at -53 region, and it could be initial site where the DNA sequence was combined with the RNA polymerase. | |||
TO cite this article:Xiaohui Wang,Hongli Zhai. The analysis of chemical features in the core promoter of Escherichia coli[OL].[19 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19438 |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
Results per page: |
About Sciencepaper Online | Privacy Policy | Terms & Conditions | Contact Us
© 2003-2012 Sciencepaper Online. unless otherwise stated