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Online since: July 2020
Authors: Sook Keng Chang, Zulkarnain Zainal, Hong Ngee Lim, Asma Samsudin, Laimy Mohd Fudzi
Effect of Heat Treatment on Electrodeposited ZnSe on Vertically Aligned ZnO Nanorods for Photoelectrochemical Cell Laimy Mohd Fudzi1,a, Zulkarnain Zainal1,2,b*, Hong Ngee Lim1,2,c, Sook-Keng Chang1,2,d, and Nurul Asma Samsudin1,e 1Department of Chemistry, Faculty of Science, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia 2Materials Synthesis and Characterization Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia alaimy93@yahoo.com, *bzulkar@upm.edu.my, chongngee@upm.edu.my, dskchang28@hotmail.com, easma.samsudin@gmail.com Keywords: electrodeposition; ZnO; ZnSe; photoelectrochemical Abstract.
According to XRD of ZnSe/ZnO sample as shown in Fig. 1, a series of peaks corresponding to: (1 0 0), (0 0 2), (1 0 1), (1 0 2), (1 1 0), (1 0 3), (1 1 2), (0 0 4) and (2 0 2) planes representing hexagonal wurzite structure of ZnO with JCPDS file of 00-003-0888 were observed.
Hernández-Calderón, Epitaxial growth of thin films and quantum structures of II–VI visible-bandgap semiconductors, Molecular Beam Epitaxy. (2013) 311-346
Hark, Structure and photoluminescence of ZnSe nanoribbons grown by metal organic chemical vapor deposition, Applied physics letters. 84(14) (2004) 2641-2643
Norton, Sols, gels, and organic chemistry, Ceramic Materials, Springer, New York, NY (2013) 411-422
Online since: August 2012
Authors: Bo Du, Zi Lu Wang, Xue Hao He
Developing coarse-grained force fields of poly (methylmethacrylate-b-2-vinylpyridine) from atomistic simulation Bo Du1, a, Zilu Wang1, b, Xuehao He2, c 1Department of Polymer Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China 2Department of Chemistry, School of science, Tianjin University, Tianjin 300072, China a2008dubo@gmail.com, bzilu_wang@tju.edu.cn, cxhhe@tju.edu.cn Keywords: Coarse-grained, PMMA-b-PVP, PMMA, PVP Abstract.
A possible solution to this problem is to reduce the number of degrees of freedom through the mapping of an atomistic model onto coarse grained structures.
(S1-S5) The centers of these superatoms are indicated by bolded circles on the atomistic chemical structures.
(S6-S7) The beads centers are identified by the real center of mass (and the center for geometric) of the corresponding atomistic chemical structure.
Harris: Poly (ethylene glycol) chemistry: biotechnical and biomedical applications, Springer, 1992
Online since: August 2013
Authors: Jin Ning Cheng, Jia Jun Han, De Li Liu
The electrochemical activity and catalytic oxygen reduction capacity of MnO2 are different when the crystal structure is varied[10-12].The activity of MnO2/C made by the traditional chemical method is low.
This can be explained that after the solution was added activated carbon, activated carbon can absorb the manganese ions and sulfate in its porous structure.
The curves show that the activated carbon concentration is zero, amorphous structure MnO2/C does not have a discharge capacity, and therefore the specific energy is low at the beginning of discharge.
Materials Chemistry and Physics, 2011, 130(3): 1191-1194
Hefei University of Technology, chapter 3, Hefei University of Technology Department of Applied Chemistry. 2007 [8] C.
Online since: January 2014
Authors: Zhongie Huan, Thomas Kivevele
MATERIALS AND METHODS Materials Mungongo seeds oil was purchased from department of chemistry; Tshwane University of Technology (Arcadia Campus), mineral diesel from a local filling station in Pretoria was used as base fuel for comparison purposes with MOME.
The chemicals used were analytical reagents: potassium hydroxide, 85% and methanol, 99.5%, which were obtained from the department of chemistry, Tshwane University of Technology (Pretoria, South Africa).
However, pour and cloud points of MOME were a bit higher than that of diesel, possible was attributed by the percentage of saturated fatty acid methyl esters in its molecular structure (17.9%).
Table, 2 Fuel properties of MOME and mineral diesel Property (Units) EN 14214 Limits ASTM D6751 Limits MOME Diesel Density at 15 °C (Kg/m3) 860-900 -- 878 845 Viscosity at 40 °C (mm2/s) 3.5-5.0 1.9-6.0 4.41 2.39 Acid Value (mg KOH/g) 0.5 max 0.8 max 0.12 -- Flash point (°C) >101 130 min 150 71 Heating Value (MJ/kg) -- -- 37.82 41.98 Lubricity (µm) -- -- 322 -- Cetane number 51 min 47 min 48.88 50.53 Cold filter plugging point (°C) -- -- -8 Cloud point (°C) -- Report -3.8 -17 Pour point (°C) -- -- -6.2 -21 Free glycerol % (m/m) 0.02 max 0.02 max 0.018 -- Total glycerol % (m/m) 0.25 max 0.24 max 0.23 -- Oxidation Stability MOME showed slightly higher oxidation stability (4.75 h) which fulfilled the minimum requirement of ASTM D6751 (3 h), but did not meet the minimum requirement of EN 14214 (6 h), this was due to the high percentage of methyl linoleate and linolenate in their molecular structure.
PY and PG were more effective than BHA because they possess three -OH groups in their aromatic rings, while BHA has only one -OH group in its molecular structure.
Online since: January 2020
Authors: N.Yu. Dudareva, Rida Gallyamova, E.I. Ustimova
The fourth sample was used to study the structure and parameters of MAO coatings.
The volume fraction of pores was determined by Glagolev’s point method [20] by overlaying a square grid on the image structure.
Tihonov, Analytical chemistry of aluminum, Moscow, Nauka Publ., 1971
Kamyshanskii, Formation of structure and properties of coatings deposited by microarc oxidizing on parts fabricated from aluminum alloys, Journal of Metal Science and Heat Treatment 189 (2011) 931-936
Taylor, Cement Chemistry, Academic Press, London, 1990
Online since: January 2013
Authors: Ming Liu, Chuan Guo Ma, Rui Shi
For CB/EP/PES, with not perfect inverted phase structure, CB particles are selectively located in PES-rich phase.
For CB/EP/PEI, with perfect inverted phase structure, CB particles are selectively located in PEI-rich phase.
For CB/EP/PES being not perfect inverted phase structure, CB particles are selectively located in PES-rich phase.
For CB/EP/PEI being perfect inverted phase structure, CB particles are selectively located in PEI-rich phase.
Wu: Materials Chemistry and Physics Vol. 104(2007), p. 240
Online since: February 2016
Authors: Tatyana D. Malinovskaya, Ilya A. Lysak, Galina V. Lysak
At the same time, the carrier material remains stereoregular and possess a helical structure.
The ratio of intensities of the absorption bands 975 and 840 cm–1 shows that the structure of NC is represented mainly by the long segments (n>10) in a helical trans-gosh-conformation, which lead to the formation of a long-length lamellar structure [13].
Consequently, after modification, the structure of NC is still represented mainly by long segments (n>10) in a helical trans-gosh-conformation.
Thus, superficial modification of NC with the tin dioxide nanoparticles does not change its chemical structure.
Fridman, Technology for processing crystalline polyolefins, Chemistry, Moscow [in Russian], 1982
Online since: October 2010
Authors: Chien Chih Lin, Wen Chen Chien, Shyue Ming Jang
., ring-like net structure, bird nest-like porous structure, and dense spherical structure.
The SAED image shows that both of the prepared nanorod and nanowire titania has a good crystalline structure.
It shows that the titania has a ring-shape net structure with size ranging from 5-8mm.
Moreover, the obtained titania with different primary shapes are successfully applied to prepare the titania secondary particles with various morphologies, i.e., ring-like net structure, bird nest-like porous structure, and dense spherical structure.
Solid State Chemistry 178 (2005) 2179
Online since: September 2011
Authors: Lin Tong Wang
Oxidation of Copper Zinc Oxide Catalysts by Carbon Monoxide Lintong Wang1, a 1 Chemistry and Chemical Engineering College, Weifang University, Weifang, China awanglt6408@sina.com Keywords: Copper zinc oxide catalysts, carbon monoxide, ambient temperature, Copper zinc, catalysts prepared Abstract.
Table 1 Steady state activity for ambient temperature carbon monoxide oxidation (GHSV = 33000 /h, 100 mg catalyst, 0.45 vol% CO) Characterisation of the catalysts by powder X-ray diffraction showed that the preparation atmosphere and ageing process strongly influence the structure of the catalyst precursor.
Hydrozincite [Zn5(CO3)2(OH)6], gerhardite [Cu2(OH)3NO3], malachite [Cu2CO3(OH)2], aurichalcite [(Cu, Zn)5- (CO3)2(OH)6] and rosasite [(Cu, Zn)2CO3(OH)2], were all determined and the relationship between preparation conditions and structure is considered to be complex.
Online since: July 2011
Authors: Li Min Shi, Cheng Li Zhang, Shuang Long Wang, Qing Guo Zhang
A Novel Carbon Quantum Dots-Ionic Liquid Hybrid with Strong Photoluminescence Qing-Guo Zhang*, Li-Min Shi, Cheng-Li Zhang, Shuang-Long Wang Department of Chemistry, Bohai University, Jinzhou 121000, China Email:zhangqguo23@yahoo.com.cn Keywords: Carbon Quantum Dots, Ionic Liquid, Hybrid, Photoluminescence Abstract.
Fukushima et al. reported that carbon nanotubes can be well-dispersed and untangled into very fine bundles form a network structure consisting of highly electrically conductive nanowires and fluid electrolytes in ILs at contents as high as 1 wt %[2].
The absorption peak of CQDIL show a little red shift (Figure 4a, curve B) due to the extended π-π conjugation in its structure [8b].