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Online since: March 2023
Authors: S.V. Vavrenyuk, V.G. Vavrenyuk, A.E. Farafonov
Polyvinyl alcohol is an affordable and environmentally friendly synthetic water-soluble polymer with a predominantly linear structure, little branching and crystallinity.
The moisture content of the samples after drying and shrinkage was about 7%, which indicates the presence of physically bound water in the structure of the cement-polymer stone.
Rebinder, Selected Works, Surface phenomena in dispersed systems, Colloidal chemistry, M., Nauka, 1978
[7] Proceedings of the All-Union Conference on Physicochemical Mechanics of Dispersed Structures, Minsk, 1974
Frolov, Course of Colloidal chemistry, Surface phenomena and dispersed systems, M., Khimiya, 1989
The moisture content of the samples after drying and shrinkage was about 7%, which indicates the presence of physically bound water in the structure of the cement-polymer stone.
Rebinder, Selected Works, Surface phenomena in dispersed systems, Colloidal chemistry, M., Nauka, 1978
[7] Proceedings of the All-Union Conference on Physicochemical Mechanics of Dispersed Structures, Minsk, 1974
Frolov, Course of Colloidal chemistry, Surface phenomena and dispersed systems, M., Khimiya, 1989
Online since: June 2011
Authors: Wen Cai Xu, Dong Li Li, Qing Ping Shi
EVA has the amorphous structure, which generally reduces the mechanical properties of LDPE after blending with the LDPE resin but, in this paper, by the method of melt blending, six kinds of LDPE/EVA films with different content of EVA were prepared, and the mechanical and barrier properties were studied.
Fresh Fruit and Vegetable Quality through the films play a key role in regulation of the three major elements: first, control the aging process, generally achieved through the control of respiration; second, control microorganisms, mainly bacteria through the control of corruption to achieve; third, control fruit and vegetable evaporation, mainly through control of relative humidity, fruit and vegetable cell structure of water[12].
Applied Chemistry, 1993, 10 (2) : p.3234 ·Research papers· [8] GB-13022-1991 Plastics-Determination of tensile properties of films [S]
Applied Chemistry, 1997, 14 (1) : p.1 [10] Gan Zhang, Yunchuan Xie, Xiaodong Fan.
Study on Crystal Structure of m2PE2LLD/ PE2LD Blends [J].
Fresh Fruit and Vegetable Quality through the films play a key role in regulation of the three major elements: first, control the aging process, generally achieved through the control of respiration; second, control microorganisms, mainly bacteria through the control of corruption to achieve; third, control fruit and vegetable evaporation, mainly through control of relative humidity, fruit and vegetable cell structure of water[12].
Applied Chemistry, 1993, 10 (2) : p.3234 ·Research papers· [8] GB-13022-1991 Plastics-Determination of tensile properties of films [S]
Applied Chemistry, 1997, 14 (1) : p.1 [10] Gan Zhang, Yunchuan Xie, Xiaodong Fan.
Study on Crystal Structure of m2PE2LLD/ PE2LD Blends [J].
Online since: February 2018
Authors: Aija Krumina, Aiga Ivdre, Gaida Sedmale, Maris Rundans
Influence of Technological Parameters on Thermal Properties
of Cordierite Ceramics
Maris Rundans1,a*, Gaida Sedmale1,b, Aija Krumina2,c and Aiga Ivdre3,d
1Riga Technical University, Institute of Silicate Materials, P.Valdena 3/7, Riga, Latvia, LV-1048
2Riga Technical University, Institute of Inorganic Chemistry, P.Valdena 3/7, Riga, Latvia, LV-1048
3Latvian State Institute of Wood Chemistry, Dzerbenes 27, Riga, Latvia, LV-1006
amaris.rundans@rtu.lv, bgaida-maruta.sedmale@rtu.lv, caija.krumina@rtu.lv, daiga.ivdre@gmail.com
Keywords: cordierite, sintering, ceramics, thermal properties
Abstract.
This could be explained by intense formation of liquid phase and possibly partial melting of cordierite/spinel phases, which degrades pore structure obtained at lower sintering temperatures.
Albeit mechanically better than the pore structure within material, the contribution of glassy phase in crystalline cordierite structure is degrading.
This could be explained by intense formation of liquid phase and possibly partial melting of cordierite/spinel phases, which degrades pore structure obtained at lower sintering temperatures.
Albeit mechanically better than the pore structure within material, the contribution of glassy phase in crystalline cordierite structure is degrading.
Online since: July 2023
Authors: Methaq Abdul Razzaq Mohsin, Taif Saad Al Maadhede, Hadi J.M. Al-Agealy
Charge transfer is a ubiquitous and basic process in various fields such as physics, chemistry, and biology.
Property p-Sexiphenyl (P6) Structure CAS 4499-83-6 Chemical Formula C36H26 Molar weight g/mol 458.592 Density g/cm3 1.102 Radius (Angstrom) 5.4845 Refractive index 1.637 Melting temperature 703.2+45°C Ionized energy 6 eV HOMO 5.9 eV LUMO 3.0 eV Scientific Name 1-phenyl-4-[4 [4-(4phenylphenyl) phenyl] phenyl] benzene Table 3.
[7] Balachandran J, Reddy P, Dunietz B D and Gavini V., “End-group-induced charge transfers in molecular junctions: effect on electronic-structure and thermos power “,Journal of Physical Chemistry..
[24] Puschnig, Peter, and Claudia Ambrosch-Draxl., “Density-functional study for the oligomers of poly (para-phenylene): Band structures and dielectric tensors” Physical Review.
Lide., CRC Handbook of Chemistry and Physics 97th Edition, 2017, vol. 85
Property p-Sexiphenyl (P6) Structure CAS 4499-83-6 Chemical Formula C36H26 Molar weight g/mol 458.592 Density g/cm3 1.102 Radius (Angstrom) 5.4845 Refractive index 1.637 Melting temperature 703.2+45°C Ionized energy 6 eV HOMO 5.9 eV LUMO 3.0 eV Scientific Name 1-phenyl-4-[4 [4-(4phenylphenyl) phenyl] phenyl] benzene Table 3.
[7] Balachandran J, Reddy P, Dunietz B D and Gavini V., “End-group-induced charge transfers in molecular junctions: effect on electronic-structure and thermos power “,Journal of Physical Chemistry..
[24] Puschnig, Peter, and Claudia Ambrosch-Draxl., “Density-functional study for the oligomers of poly (para-phenylene): Band structures and dielectric tensors” Physical Review.
Lide., CRC Handbook of Chemistry and Physics 97th Edition, 2017, vol. 85
Online since: December 2011
Authors: Wei Qiang Wang, De Dong Hu, Zhi Quan Zhao, Gui Min Zhang, Wen Qin Bai, Jian Bin Zhuang, Ming Lei Ding
During the past decade, interest about the supercritical state has increased significantly because of its importance in a variety of fields, including synthetic chemistry, environmental chemistry, analytical chemistry, material science, food industry, and powder technology [1,2].
During RESS process,the factors that have impact on particle morphology, particle size and size distribution are primarily pressure, solute concentration, the nozzle structure, temperature, expansion rate of the solution, co-solvent and so on [15].
Solubility of the solute in the supercritical fluid was not only relevant to the density of the supercritical fluid, but also depended on the chemical structure of the solute, solute volatility as well as the interaction between the supercritical fluid and the solute.
Nozzle structure largely affects particle morphology and size.
During RESS process,the factors that have impact on particle morphology, particle size and size distribution are primarily pressure, solute concentration, the nozzle structure, temperature, expansion rate of the solution, co-solvent and so on [15].
Solubility of the solute in the supercritical fluid was not only relevant to the density of the supercritical fluid, but also depended on the chemical structure of the solute, solute volatility as well as the interaction between the supercritical fluid and the solute.
Nozzle structure largely affects particle morphology and size.
Online since: May 2011
Authors: Wen Hao Ye, Zheng Lin, Bing Jie Liu, Xiao Juan Shi, Xiang Yu Wang, Xiu Cheng Zheng
Synthesis, Characterization and Catalytic Efficiency of Ti-SBA-15 Mesoporous Materials
Xiucheng Zheng, Wenhao Ye, Zheng Lin, Bingjie Liu, Xiaojuan Shi, and Xiangyu Wang
Department of Chemistry, Zhengzhou University, Zhengzhou 450001, China
zhxch@zzu.edu.cn
Keywords: Ti-SBA-15; Hydrothermal process; Synthesis temperatures; Cyclohexene; Epoxidation
Abstract.
The results clearly indicated that the synthesis temperatures remarkably affected the structure.
In other words, although the ordered mesoporous structure of SBA-15 are retained at low crystallization temperature, higher temperature leads to some disruption of the structure.
This also suggested that the doping of titanium species retained the typical mesoporous structure of SBA-15.
The results clearly indicated that the crystallization temperature affected the pore structure greatly.
The results clearly indicated that the synthesis temperatures remarkably affected the structure.
In other words, although the ordered mesoporous structure of SBA-15 are retained at low crystallization temperature, higher temperature leads to some disruption of the structure.
This also suggested that the doping of titanium species retained the typical mesoporous structure of SBA-15.
The results clearly indicated that the crystallization temperature affected the pore structure greatly.
Online since: September 2008
Authors: Maurizio Fermeglia, Sabrina Pricl, Marek Maly, Paola Posocco
However, despite all efforts,
progress in the prediction of macroscopic physical properties from structure has been slow.
Further MD simulations were then carried out to predict some material properties of the network structures thus obtained.
The 3D network structure obtained with the procedure described above was relaxed by performing annealing cycles up to 600K.
The minimum energy structure was selected for further NVT and NPT molecular dynamics simulation at 300K for data collection.
Scherer: Sol-Gel Science, The Physics and Chemistry of Sol-Gel Processing (Academic Press, New York, USA 1990)
Further MD simulations were then carried out to predict some material properties of the network structures thus obtained.
The 3D network structure obtained with the procedure described above was relaxed by performing annealing cycles up to 600K.
The minimum energy structure was selected for further NVT and NPT molecular dynamics simulation at 300K for data collection.
Scherer: Sol-Gel Science, The Physics and Chemistry of Sol-Gel Processing (Academic Press, New York, USA 1990)
Online since: March 2005
Authors: R.J. Newport, M.E. Smith, Larry L. Hench, Priya Saravanapavan, L.J. Skipper, F.E. Sowrey, D.M. Pickup, K.O. Drake, Z.H. Lin
Extended X-ray Absorption Fine Structure (EXAFS), X-ray
Absorption Near Edge Structure (XANES), X-ray diffraction (XRD), and solid state nuclear
magnetic resonance (NMR) measurements have been performed with results showing the
formation of a significantly amorphous HCAp layer after less than 5 hours in solution.
Extended X-Ray Absorption Fine Structure and X-Ray Absorption Near Edge Structure (EXAFS and XANES) Data Collection.
The apatite structure consists of Ca 2+ ions in different sites; Ca(1) occupy the columnar site and are connected to the neighbouring Ca 2+ ions above and below by three shared oxygen atoms and three further oxygen atoms at a further distance, to give a nine-fold coordination of oxygen.
By using a coherent suite of complementary experimental techniques to study changes in the composition of calcia:silica sol-gel glass it is possible to observe changes in the atomic scale structure of the starting material, the (CaO)0.3(SiO2)0.7 gel-glass, on reaction with SBF.
Elliot, Structure and Chemistry of the Apatites and Other Calcium Orthophosphates (Elsevier, Amsterdam, 1994)
Extended X-Ray Absorption Fine Structure and X-Ray Absorption Near Edge Structure (EXAFS and XANES) Data Collection.
The apatite structure consists of Ca 2+ ions in different sites; Ca(1) occupy the columnar site and are connected to the neighbouring Ca 2+ ions above and below by three shared oxygen atoms and three further oxygen atoms at a further distance, to give a nine-fold coordination of oxygen.
By using a coherent suite of complementary experimental techniques to study changes in the composition of calcia:silica sol-gel glass it is possible to observe changes in the atomic scale structure of the starting material, the (CaO)0.3(SiO2)0.7 gel-glass, on reaction with SBF.
Elliot, Structure and Chemistry of the Apatites and Other Calcium Orthophosphates (Elsevier, Amsterdam, 1994)
Online since: May 2004
Authors: Malina Raileanu, Maria Zaharescu, Monica Popa, J.M. Calderon Moreno
Zaharescu
1
1
Romanian Academy, Institute of Physical Chemistry "I.G.
The reaction mixtures contained tetrapropylammonium (TPA +) as templating agent, which was incorporated in the molecular sieve structure and was removed by calcination in order to open up the pore structure and render the material useful as a membrane.
The crystal structure of the obtained materials was determined by X-ray diffraction.
All the powders have the same structure.
The results of this study indicate the role of the crystal formation by controlling the conditions of the hydrothermal treatment and also that the structure of the zeolites is influenced by factors as structure of the support and reaction conditions.
The reaction mixtures contained tetrapropylammonium (TPA +) as templating agent, which was incorporated in the molecular sieve structure and was removed by calcination in order to open up the pore structure and render the material useful as a membrane.
The crystal structure of the obtained materials was determined by X-ray diffraction.
All the powders have the same structure.
The results of this study indicate the role of the crystal formation by controlling the conditions of the hydrothermal treatment and also that the structure of the zeolites is influenced by factors as structure of the support and reaction conditions.
Online since: November 2020
Authors: Galina S. Kraynova, Alexander Davydenko, Sergey Komogortsev, Rauf Iskhakov, Nikita Ilin, Vitaliy Ivanov, Vladimir Plotnikov, Ivan Tkachenko
The structure was controlled by x-ray diffraction (Bruker D8 Advance).
Domain structure of alloys FeCu0.2Nb3Si16.5B6 (a), FeCu1Nb3Si16B6 (b), FeCu1.5Nb3Si16.5B6 (c).
However, the domain structure change depends on the direction of the applied magnetic field.
The domain structure of the studied alloys consists of two types of patterns: planar domains separated by 180° walls and the fingerprint-like stress patterns characterized by a labyrinth type structure.
Abrosimova, Evolution of the structure of amorphous alloys, Physics-Uspekhi. 54 (2011) 1227–1242
Domain structure of alloys FeCu0.2Nb3Si16.5B6 (a), FeCu1Nb3Si16B6 (b), FeCu1.5Nb3Si16.5B6 (c).
However, the domain structure change depends on the direction of the applied magnetic field.
The domain structure of the studied alloys consists of two types of patterns: planar domains separated by 180° walls and the fingerprint-like stress patterns characterized by a labyrinth type structure.
Abrosimova, Evolution of the structure of amorphous alloys, Physics-Uspekhi. 54 (2011) 1227–1242