Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: September 2013
Authors: Cui Hua Dong, Zhao Hui Zhen
Consequently, zeta potential affects the electric double layer structure of the emulsion and wall material reaction in the preparation of MF microcapsules.
The primary reason is: If the applying amount is too few, the stable electric double layer structure would not be generated, which would bring the particles to conglutinate and the wall material to form uniform films.
The Physical Chemistry Principles of the Surface Active Agent.
Theoretic chemistry of dyeing.
The primary reason is: If the applying amount is too few, the stable electric double layer structure would not be generated, which would bring the particles to conglutinate and the wall material to form uniform films.
The Physical Chemistry Principles of the Surface Active Agent.
Theoretic chemistry of dyeing.
Online since: May 2011
Authors: Min Deng, Ye Qing Shen
Application of capillary absorption on characterization of structure of cement compacts containing micro silica fume
Yeqing Shen1,2, a, Min Deng1, b
1College of Materials Science and Engineering, Key State Laboratory of Materials-oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, Jiangsu, China;
2 College of Chemistry and Materials Science, Anhui Key Laboratory of Functional Molecular Solids, Anhui Normal University, Wuhu 241000, Anhui, China
as_y_qing@163.com, bdengmin1965@163.com
Keywords: Capillary pore, cement compact, silica fume, capillary ethanol absorption
Abstract.
Effect of packed structure on behavior of capillary absorption was briefly reviewed.
A short review on effect of packed structure on behavior of capillary absorption In packed structure, pores between particles can be envisioned as bundles of homogeneous capillaries [2, 3].
Wilson [6, 7] researched liquid absorption in a non-uniform packed structure.
In the case of cement packing structure, fine micro-pore structure containing large coarse pore is in the extreme.
Effect of packed structure on behavior of capillary absorption was briefly reviewed.
A short review on effect of packed structure on behavior of capillary absorption In packed structure, pores between particles can be envisioned as bundles of homogeneous capillaries [2, 3].
Wilson [6, 7] researched liquid absorption in a non-uniform packed structure.
In the case of cement packing structure, fine micro-pore structure containing large coarse pore is in the extreme.
Online since: August 2011
Authors: Zhi Chao Wang, Huan Liu, Hua Hou, Zhen Xing Yang, Zhong Wei
The TEM photos illustrated that SBS/PBMA-b-PMA formed an obvious core-shell structure, with cross-linked SBS/PBMA core and linear PMA shell.
Acrylic copolymer which has core-shell structure is one of the eximious impact modifiers for PVC [7,8].
After that, the monomer MA could only polymerized through the free radicals at the end of PBMA or SBS, formed linear PMA and divergent structure outside of the network.
Further micro-phase structure difference could be found through the comparation of (b) and (c).
Yurtov: Fibre Chemistry Vol. 41 (2009), p. 80
Acrylic copolymer which has core-shell structure is one of the eximious impact modifiers for PVC [7,8].
After that, the monomer MA could only polymerized through the free radicals at the end of PBMA or SBS, formed linear PMA and divergent structure outside of the network.
Further micro-phase structure difference could be found through the comparation of (b) and (c).
Yurtov: Fibre Chemistry Vol. 41 (2009), p. 80
Online since: October 2013
Authors: Jing Ru Jia
According to the structure of the dendrimer synthesized, methyl orange was used as the guest molecule.
It is a macromolecule with highly-branched dendritic structure obtained by the progressively repetitive reaction from the branched primitives [1].
The structures of the products synthesized were consistent with the design. 4.2 Effect of Reaction Temperature on the Condensation Reaction of Polyurethane The instruments and reagents were applied in accordance with the requirements.
Chemistry Bulletin, 2011, 74 (12): 1105-1111
Applied Chemistry, 1996, 13 (2): 98-100 [7] C.
It is a macromolecule with highly-branched dendritic structure obtained by the progressively repetitive reaction from the branched primitives [1].
The structures of the products synthesized were consistent with the design. 4.2 Effect of Reaction Temperature on the Condensation Reaction of Polyurethane The instruments and reagents were applied in accordance with the requirements.
Chemistry Bulletin, 2011, 74 (12): 1105-1111
Applied Chemistry, 1996, 13 (2): 98-100 [7] C.
Online since: February 2011
Authors: Jun Du, Dong Han, Wen Fang Li, Jun Jun Zhang
Study of the Ce-Mn Conversion Coating on 6061 Aluminium Alloy
Junjun Zhang1,a ,Dong Han2,b ,Wenfang Li2, ,Jun Du2,c
1School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University, Zhongshan 528458, PR China
2School of Materials Science and Engineering, South China University of Technology,
Guangzhou 510640, PR China
azjjhscn@163.com, b99handong@gmail.com, cjundu@scut.edu.cn
Keywords: Surface, Thin Film; (NH4)2Ce(NO3)6; Mnso4; H2O2;Deposition; Corrosion Resistance
Abstract.
In this work, the green chemistry conversion coating on 6063 aluminium alloy surface was made and studied by means of (NH4)2Ce(NO3)6-H2O2 as inhibitor, HF-FeCl3 as accelerator.
The constant phase element CPEc and Rc are surface coating capacitance and resistance associated with porous structure and defects of coating, respectively.
In this work, the green chemistry conversion coating on 6063 aluminium alloy surface was made and studied by means of (NH4)2Ce(NO3)6-H2O2 as inhibitor, HF-FeCl3 as accelerator.
The constant phase element CPEc and Rc are surface coating capacitance and resistance associated with porous structure and defects of coating, respectively.
Online since: January 2010
Authors: Genoveva Atanasova, Dimitar Stoychev, Plamen Stefanov, Boško Grbić, Nenad Radić, Desislava Guergova
The surface chemistry of alumina is of significant scientific and technological interest in areas such
as catalysis, microelectronics, ceramics, adhesion, corrosion and wetting [1-4].
It is well known that the variety of physical and chemical properties exhibited by metal oxides is determined by the specificity of their electronic structures.
The spectra are composed of a two-peak structure.
The spectra of the oxide films prepared by spray pyrolysis in Figs. 1a and 1b exhibit a well pronounced double peak structure.
However, the two peak structure shows a higher width of about 10 eV as compared to crystalline α-Al2O3 (8.28 eV [12, 13]).
It is well known that the variety of physical and chemical properties exhibited by metal oxides is determined by the specificity of their electronic structures.
The spectra are composed of a two-peak structure.
The spectra of the oxide films prepared by spray pyrolysis in Figs. 1a and 1b exhibit a well pronounced double peak structure.
However, the two peak structure shows a higher width of about 10 eV as compared to crystalline α-Al2O3 (8.28 eV [12, 13]).
Online since: December 2012
Authors: Quan Sheng Liu, Ke Duan Zhi, Run Xia He, Fang Wu, Ya Gang Zhang, Li Yang
Apparently, This result indicates that the Cu-Mn based catalyst while the 2[NaOH]/[Cu2++Mn2+] is above 1.2 shows strong physical structure, whereas other samples has weaker structure.
The dried Cu-Mn sample while the 2[NaOH]/[Cu2++Mn2+] is lower 1.0 only consists of the hydrate basic copper sulfate, Cu4SO4(OH)6·H2O (JCPDS 20-0364) with a typical layer-structure.
It is interesting that the all dried samples were transferred to the spinel structured Cu1.5Mn1.5O4 after calcining at 550℃ (Fig.2-b) no matter what precipitator were used.
Conclusions 2[NaOH]/[Cu2++Mn2+] are important parameters to affect phase structure and texture of the Cu-Mn based WGS catalyst, especially catalytic performance.
Journal of Inorganic and Nuclear Chemistry, 41(8)1979, 1015-1-18
The dried Cu-Mn sample while the 2[NaOH]/[Cu2++Mn2+] is lower 1.0 only consists of the hydrate basic copper sulfate, Cu4SO4(OH)6·H2O (JCPDS 20-0364) with a typical layer-structure.
It is interesting that the all dried samples were transferred to the spinel structured Cu1.5Mn1.5O4 after calcining at 550℃ (Fig.2-b) no matter what precipitator were used.
Conclusions 2[NaOH]/[Cu2++Mn2+] are important parameters to affect phase structure and texture of the Cu-Mn based WGS catalyst, especially catalytic performance.
Journal of Inorganic and Nuclear Chemistry, 41(8)1979, 1015-1-18
Online since: January 2012
Authors: Qian Xiang
Chemical activity of MnO2 can be influenced by many factors; most determined by its crystal structure.
It has various allotropes, such as α,β,γ,ε,λ,and δ structure; the difference lies in that Mn ion position is different in octahedron configuration.
MnO2 mainly has two kindly of structures, one is chain structure or tunnel structure, e.g. a-MnO2, γ- MnO2 and etc; the other one is sheet structure or layer structure, e.g. manganese ore andδ- MnO2.
MnO2 active material can be prepared through chemistry way and electrochemistry; the former one is called CMD, and the latter one is called EMD.
[3] Guan Congsheng, Du Ailing and Yang Yuguo, “High-energy chemistry power source,” .
It has various allotropes, such as α,β,γ,ε,λ,and δ structure; the difference lies in that Mn ion position is different in octahedron configuration.
MnO2 mainly has two kindly of structures, one is chain structure or tunnel structure, e.g. a-MnO2, γ- MnO2 and etc; the other one is sheet structure or layer structure, e.g. manganese ore andδ- MnO2.
MnO2 active material can be prepared through chemistry way and electrochemistry; the former one is called CMD, and the latter one is called EMD.
[3] Guan Congsheng, Du Ailing and Yang Yuguo, “High-energy chemistry power source,” .
Online since: May 2015
Authors: Ainur Khairullin, Alexey O. Rodin
Ni Grain Boundary Diffusion in Cu-Co Alloys
Alexey Rodin1,a, Ainur Khairullin1
1Department of Physical Chemistry, NUST MISiS, 4, Leninsky pr-t, Moscow, Russian Federation
arodin@misis.ru
Keywords: grain boundary diffusion, Cu-Co alloys, grain boundary structure.
From the obtained results it follows that Co does not change the GB structure.
We must take into account that in polycrystalline materials GBs are of different structure.
From the obtained results it follows that Co does not change the GB structure.
We must take into account that in polycrystalline materials GBs are of different structure.
Online since: March 2015
Authors: Gang Sun, Yan Fang
The moth wing surface, composed of naturally hydrophobic material, is of high hydrophobicity (CA 143~156°) and exhibits complicated hierarchical micro-morphology including primary structure, secondary structure and tertiary structure.
Introduction The superhydrophobic surface, because of the important aspects of surface physics, surface chemistry, and wide applications ranging from self-cleaning materials, marine coatings, anti-adhesive coatings to microfluidic devices, has aroused tremendous attention and resulted in an increasing number of reports in the last few years.
The moth wing surface exhibits hierarchical rough structures made up of primary structure (the micrometric scales) [Fig. 1(A)], secondary structure (the submicro longitudinal ridges and lateral bridges on the scales) [Fig. 1(B)] and tertiary structure (the nano stripes on the longitudinal ridges and lateral bridges) [Fig. 1(C)].
Fig. 1 The multiple-dimensional rough micro-morphology of the moth wing surface (A) Primary structure (SEM); (B) Secondary structure (SEM); (C) Tertiary structure (SEM); (D) Schema chart and parameters of the longitudinal ridge (d: height; e: width, f: spacing).
Fig. 4 FT-IR spectra of the moth wing surfaces Summary The moth wing surface, composed of naturally hydrophobic material, is of high hydrophobicity (CA 143~156°) and hierarchical micro-morphology including primary structure, secondary structure and tertiary structure.
Introduction The superhydrophobic surface, because of the important aspects of surface physics, surface chemistry, and wide applications ranging from self-cleaning materials, marine coatings, anti-adhesive coatings to microfluidic devices, has aroused tremendous attention and resulted in an increasing number of reports in the last few years.
The moth wing surface exhibits hierarchical rough structures made up of primary structure (the micrometric scales) [Fig. 1(A)], secondary structure (the submicro longitudinal ridges and lateral bridges on the scales) [Fig. 1(B)] and tertiary structure (the nano stripes on the longitudinal ridges and lateral bridges) [Fig. 1(C)].
Fig. 1 The multiple-dimensional rough micro-morphology of the moth wing surface (A) Primary structure (SEM); (B) Secondary structure (SEM); (C) Tertiary structure (SEM); (D) Schema chart and parameters of the longitudinal ridge (d: height; e: width, f: spacing).
Fig. 4 FT-IR spectra of the moth wing surfaces Summary The moth wing surface, composed of naturally hydrophobic material, is of high hydrophobicity (CA 143~156°) and hierarchical micro-morphology including primary structure, secondary structure and tertiary structure.