Chinese︱Feedback︱Save this page

Login︱Register

• Elaborating Academic Views 　　　　 • Exchanging Innovative Ideas
• Protecting Intellectual Properties 　　• Fast Sharing Science Papers

Sponsored by the Center for Science and Technology Development of the Ministry of Education
Supervised by Ministry of Education of the People's Republic of China

Home > Papers > Chemistry

There are 65 papers published in subject: since this site started.

Results per page:

65 Total, 7 Pages | << First < Previous 3 4 5 6 7 Next > Last >>

Select Subject

All (8831)

Agronomy (158)

Animal Husbandry,... (64)

Aquatic Science (16)

Astronomy (36)

Aviation (22)

Basic Medicine (184)

Biology (504)

Chemical Engineering (103)

Chemistry (635)

Civil and Archite... (105)

Clinical Medicine (236)

Computer Science ... (924)

Dynamic and Elect... (121)

Earth Science (119)

Economics (67)

Education (31)

Electrics, Commun... (927)

Energy Science an... (67)

Engineering and T... (15)

Environmental Sci... (140)

Food Science and ... (63)

Forestry (36)

Hydraulic Enginee... (40)

Mechanics (240)

Metallurgical Eng... (32)

Mine Engineering ... (38)

Nuclear Science a... (21)

Pharmacy (98)

Physics (920)

Preventive Medici... (37)

Psychology (20)

Security Science ... (17)

Sports Science (6)

Surveying and Map... (15)

Textile Science a... (16)

Traditional Chine... (56)

Transportation En... (57)

Second-level Subject

Analytical Chemistry(112)
Applied Chemistry (Specif...(23)
Chemical Physics(2)
History of Chemistry(0)
Nuclear Chemistry(0)
Organic Chemistry(132)
Other Subjects of Chemistry(7)
Physical Chemistry(172)
Polymer Chemistry(64)
Polymer Physics(12)

Rank

Results per page:

65 Total, 7 Pages | << First < Previous 3 4 5 6 7 Next > Last >>

Alert Name:
Alerting to:
Authentication email will be sent to your email address in 24 hours
Frequency:
Email Message Format:	Plain text Graphical(HTML)

Complete the form below and we will recommend the selected titles to your friends on your behalf. * Indicates a required field.
Your name*:
Your email address*:
Recipient's name*:
Recipient's email address*:
(multiple recipient's names and email addresses should be separated with semicolons)
Your comments:	I thought you would find the page(s) useful.

Your name:
Your email address:
Recipient's name:
Recipient's email address:
(multiple recipient's names and email addresses should be separated with semicolons)
Your comments:	I thought you would find this page useful.

Disclaimer: This message was sent to your friend using the "Send it to a friend" facility on the Sciencepaper Online’ WWW site, http://www.paper.edu.cn/en. The Sciencepaper Online is not responsible for the content of this email, and anything said in this email does not necessarily reflect the Sciencepaper Online's views.


	1. Synthesis, Spectroscopy and Structure Characterization of Copper(II) and Nickel(II) Complexes with 5-nitroorotic Acid
	Jingjing Zhang,Cai Cheng,Wei Shi,Peng Cheng
	Chemistry 23 June 2009
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:Two novel complexes [CuL(H2O)3]•H2O (1) and [NiL(H2O)4]•H2O (2) (HL = 5-nitroorotic acid) have been synthesized and characterized by elemental analysis, IR, electronic spectra, EPR spectra and single crystal X-ray diffraction. Complexes 1 and 2 crystallized in the monoclinic system space group P21/n with lattice parameters of 1: a = 11.275(6) Å, b = 5.977(3) Å, c = 16.281(8) Å, ß = 91.579(7)°, Z = 4, R1 = 0.0460, ωR2 = 0.1162, and those of 2: a =16.026(2) Å, b = 10.107(3) Å, c = 19.360(7) Å, ß = 90.934(6)°, Z = 4, R1 = 0.0690, ωR2 = 0.0931. In the two compounds, the metal ions are six-coordinated by water molecules and ligands.
	TO cite this article:Jingjing Zhang,Cai Cheng,Wei Shi, et al. Synthesis, Spectroscopy and Structure Characterization of Copper(II) and Nickel(II) Complexes with 5-nitroorotic Acid[OL].[23 June 2009] http://en.paper.edu.cn/en_releasepaper/content/33369


	2. 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

Saved Papers

Saved Papers


	3. Green Preparation Method of Micelles Loaded with Paclitaxel Using Supercritical Carbon Dioxide
	Na Liu,Xing Wang,Zhen Jiao ,Zhiming Chen
	Chemistry 26 February 2009
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:Supercritical fluid evaporation, a novel method for preparation of micelles loaded paclitaxel using supercritical carbon dioxide without any organic solvent toxic to the human body has been developed. This method allowed aqueous dispersions of micelles to be formed by the mixture of water/supercritical carbon dioxide/ amphiphilic block copolymer/ paclitaxel with sufficient stirring and subsequently system released to atmospheric pressure. Blank and paclitaxel-loaded polymeric micelles were obtained from the PBMA-b-PMPC (poly(n-butyl methacrylate)-b-poly(2-methacryloyloxyethyl phosphorylcholine)) copolymer, which was prepared by RAFT polymerization. The paclitaxel-loaded polymeric micelles had high loading content (above 12%). TEM analysis revealed a regular spherical shape, small diameter (less than 100 nm) and narrow size distribution of the micelles. In vitro release kinetics of paclitaxel from the micelles was also studied. More than 50% of the paclitaxel was released within 132h, which was much higher than organic solvant evaporation.
	TO cite this article:Na Liu,Xing Wang,Zhen Jiao , et al. Green Preparation Method of Micelles Loaded with Paclitaxel Using Supercritical Carbon Dioxide[OL].[26 February 2009] http://en.paper.edu.cn/en_releasepaper/content/29658


	4. DMC Formation over CexZr1-xO2 Prepared by Complex-Decomposition Method
	Zhang Zhifang,Liu Zhaotie ,Liu Zhongwen
	Chemistry 10 February 2009
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:A series of bimodal porous CexZr1-xO2 (x = 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1.0) solid solutions were prepared by complex-decomposition method. The results of XRD, Raman, SEM, mercury porosimetry and N2 adsorption/ desorption measurements indicated that the physical properties of the solid solutions were significantly affected by the Ce/Zr molar ratio and the calcination temperatures. The Ce0.5Zr0.5O2 solid solutions presented bimodal mesopores with narrow pore size distributions (PSD). These solid solutions can be used in dimethyl carbonate (DMC) synthesis from methanol and CO2. Results indicated that calcination temperatures and the molar ratio of CexZr1-xO2 were the key factor in determining the catalytic activity for DMC synthesis. It exhibited higher catalytic performance to DMC when the molar ratio of Ce to Zr is to be of 1.0 under the calcination temperature of 1273 K. However, the methanol conversion is still low which is limited by the reaction equilibrium. The addition of 1, 1, 1-trimethoxy methane (TMM) was engaged to consume H2O produced in synthesis of DMC, and found that it was very effective for the increase in the methanol conversion from 1.8 to 7.85% under 377 K, 20 MPa and 24 h. The combination of the bimodal porous catalyst with an effective H2O removal agent for the reaction system can provide a novel process of selective DMC production directly from CO2 and CH3OH with dramatic efficiency for the maximum CH3OH conversion of 10.4%. The mechanism of the direct synthesis of DMC from CO2 and CH3OH with the additive of TMM over CexZr1-xO2 catalyst was also discussed.
	TO cite this article:Zhang Zhifang,Liu Zhaotie ,Liu Zhongwen. DMC Formation over CexZr1-xO2 Prepared by Complex-Decomposition Method[OL].[10 February 2009] http://en.paper.edu.cn/en_releasepaper/content/28734


	5. Cycloaddition of epoxides with carbon disulfide catalyzed by an electrophile-nucleophile binary system
	Hui Wang,Bo Li,Xiao-Bing Lu
	Chemistry 02 February 2009
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:The cycloaddition of epoxides with carbon disulfide proceeds effectively by using a binary catalyst system of tetradentate Schiff-base aluminum complexes (designated as SalenAlX) as electrophile in connection with quaternary ammonium salt as nucleophile. The steric factor of the substituent goups on the aromatic rings of SalenAlX and the anion of quaternary ammonium salt all have significant effects on the activity of the binary catalyst system, as well as the selectivities of the resulting cyclic products. The effects of temperature, time and the molar ratio of reactants were also investigated in detail with regard to propylene oxide with carbon disulfide, and a plausible mechanism was proposed.
	TO cite this article:Hui Wang,Bo Li,Xiao-Bing Lu. Cycloaddition of epoxides with carbon disulfide catalyzed by an electrophile-nucleophile binary system[OL].[ 2 February 2009] http://en.paper.edu.cn/en_releasepaper/content/28362


	6. Comparative study of the hydrogen-bonded complexes of
	Zhang WenHua,Bi Shi
	Chemistry 14 January 2009
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:The hydrogen-bonded complexes of water with eight amino acids (Pro, Hyp, Ser, Glu, Arg, Lys, Gly and Asp) found frequently in collagen were studied. The structures, stability and vibrational spectra of the hydrogen-bonded complexes have been studied by using DFT calculations. Full geometry optimization has been performed for the studied complexes by B3LYP/6-31+G(d) and B3LYP/6-311++G(d,p) calculations. The optimized geometric parameters and interaction energies for various complexes at two levels were estimated. Finally, the vibrational spectra of these complexes were also investigated. Having in mind the hydrogen bonds formed by C=O and N–H groups of the backbone and polar amino acid side chains in collagen, the hydrogen-bonded complexes can be ordered according to their stability as follows: Arg > Glu > Ser > Asp > Pro > Lys > Hyp > Gly. The BSSE corrected interaction energies suggest that the interactions of Pro, Lys, Hyp and Gly with water are similar. The B3LYP/6-311++G(d,p) calculations show the frequency red-shift in hydrogen bond donor modes and an increase of the IR intensity of the νOH vibration of H2O in the complexes A4, G3, N4, P2, L3, Hp4, Gly1 and S3 beyond thirty times.
	TO cite this article:Zhang WenHua,Bi Shi. Comparative study of the hydrogen-bonded complexes of[OL].[14 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27836


	7. Spectroscopic investigation of interaction between mangiferin and bovine serum albumin
	Hui Lin,Jingfeng Lan,Min Guan,Fenling Sheng,Haixia Zhang
	Chemistry 08 January 2009
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:The mechanism of interaction between mangiferin (MA) and bovine serum albumin (BSA) in aqueous solution was investigated by fluorescence spectra, synchronous fluorescence spectra, absorbance spectra and Fourier transform infrared (FT-IR) spectroscopy. The binding constants and binding sites of MA to BSA at different reaction time were calculated and the distance between the MA and BSA was estimated to be 5.20 nm based on Föster’s theory. In addition, synchronous fluorescence and FT-IR measurements revealed that the secondary structures of the protein changed by the interaction of MA with BSA. Furthermore, the influence of β-cyclodextrin on the system was studied. As a conclusion, the interaction between the anti-diabetes Chinese medicine MA and BSA was studied preliminary which may provide some significant information for the mechanism of the chinese traditional medicine MA on the protein level to cure diabetes or other diseases.
	TO cite this article:Hui Lin,Jingfeng Lan,Min Guan, et al. Spectroscopic investigation of interaction between mangiferin and bovine serum albumin[OL].[ 8 January 2009] http://en.paper.edu.cn/en_releasepaper/content/27467


	8. 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


	9. Solvothermal preparation of Cu2O/Cu crystalline particles
	Xiaoyan Zhang,Wang Shuangping,Pei Meishan,Pan Qiwei
	Chemistry 03 June 2008
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:Cu2O/Cu crystalline particles were synthesized via solvothermal reaction using dodecyl sulfate sodium as surfactant and D-glucose as reducing agent at 140°C for 4h. The products were characterized by means of transmission electron microscopy (TEM) and X-ray diffraction (XRD). The different morphologies of Cu2O/Cu crystals such as spherical and cubic can be obtained simply by adjusting the composition of the reaction system. For example, if small amounts of water was added in a mixture of Cu(NO3)2 and ethanol, the cubic morphology crystals could be formed. Moreover the ratio of water/ ethanol played a crucial role in fine tuning the structure and size of as-prepared Cu2O/Cu nanocrystals.In this paper, the formation mechanism of obtained cubic and spherical Cu2O/Cu crystalline particles is discussed.
	TO cite this article:Xiaoyan Zhang,Wang Shuangping,Pei Meishan, et al. Solvothermal preparation of Cu2O/Cu crystalline particles[OL].[ 3 June 2008] http://en.paper.edu.cn/en_releasepaper/content/21930


	10. The dynamical complexity in electrochemical oxidations of thiocyanate
	Liu Li ,Feng Jiamin ,Wu Guoguang ,Lv Xiaoli ,Gao Qingyu
	Chemistry 27 March 2008
	Show/Hide Abstract \| Cite this paper︱Full-text: PDF (0 B)

	Abstract:Kinetics and mechanism of the electrochemical oxidation of thiocyanate on a Pt electrode were investigated using various electrochemical methods, in which both current and potential oscillations have been observed. Cyclic voltammetry measurements illustrate that the oxidation process is through two steps. In addition to the oscillatory behavior, the system also exhibits bistability, in which the oxidation could be switched between a high and low current density states with a temporal potential perturbation. The presence of inert ions with stronger absorption also induces transitions from oscillatory to steady reactions in the thiocyanate system.
	TO cite this article:Liu Li ,Feng Jiamin ,Wu Guoguang , et al. The dynamical complexity in electrochemical oxidations of thiocyanate[OL].[27 March 2008] http://en.paper.edu.cn/en_releasepaper/content/19774

	Check out RSS, or use RSS reader to subscribe this item