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Online since: January 2012
Authors: Xiao Yan Lin, Xue Guang Luo, Chi Zhang, Lei Pang, Da Huan Liu, Chong Li Zhong
Mesoscale Simulation of Drug Molecules Distribution in the Matrix of Konjac Glucomannan (KGM) at Varying Drug Concentrations
Lei Pang1a, Chi Zhang*1b, Dahuan Liu2c, Chongli Zhong2d, Xuegang Luo1e
and Xiaoyan Lin1f
1Engineering Research Center of Biomass Materials, Ministry of Education, China; Southwest University of Science and Technology, Mianyang 621010, China.
2Laboratory of Computational Chemistry, Department of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
aandy2010you@gmail.com; b*zcbomac@gmail.com; cliudh@mail.buct.edu.cn; dzhongcl@mail.buct.edu.cn; elxg
Groot and Warren [11, 12] made an important contribution to this method by establishing relationship between a simple function form of the conservative repulsion in DPD and the Flory–Huggins parameter theory, which lead DPD method being widely applied in the study of mesoscale structures of complex systems.
The molecular structure of Carmustine is divided into three types of particles (Ch, Ni, and Ch) while water is represented as a particle W.
The chemical structures of drug, KGM and water were defined as hydrophilic or hydrophobic beads and drug-KGM-water interactions were conducted the computational simulation at mesoscopic scale. 1 and 5 mol% of Carmustine concentration levels were conducted simulation and the micromorphologies of BCNU-KGM were observed.
Groot and Warren [11, 12] made an important contribution to this method by establishing relationship between a simple function form of the conservative repulsion in DPD and the Flory–Huggins parameter theory, which lead DPD method being widely applied in the study of mesoscale structures of complex systems.
The molecular structure of Carmustine is divided into three types of particles (Ch, Ni, and Ch) while water is represented as a particle W.
The chemical structures of drug, KGM and water were defined as hydrophilic or hydrophobic beads and drug-KGM-water interactions were conducted the computational simulation at mesoscopic scale. 1 and 5 mol% of Carmustine concentration levels were conducted simulation and the micromorphologies of BCNU-KGM were observed.
Online since: December 2009
Authors: Koichi Kikuta, Masato Fujioka, Wataru Sakamoto, Toshiaki Yamaguchi, Shin Ichi Hirano
Hirano1
1Department of Applied Chemistry, Graduate School of Engineering,
2EcoTopia Science Institute, Nagoya University,
Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan
Keywords: PZT, aqueous slurry, dispersant, piezoelectric properties
ABSTRACT
The effect of poly ammonium acrylate (PAA-NH4) dispersant on the dispersibility of Pb(Zr,Ti)O3
(PZT) slurries and the piezoelectric properties of resultant PZT sintered bodies was investigated for
the establishment of environmentally friendly aqueous processing.
It is known that the conformation of PAA molecules varies with the degree of dissociation of carboxyl groups in the structure.
On the other hand, at the higher pH side, the amount of adsorbed PAA was only 0.2 mass% due to its largely occupied volume derived from the well-stretched PAA structure and intermolecular electrostatic repulsion among PAA molecules.
Pb2+ is known to be very harmful to environment and human body and the dissolution of Pb 2+ in the PZT structure into the water by hydrolysis has some undesired influences on surface condition of PZT particles, sinterability and electrical properties of resultant PZT ceramics.
It is known that the conformation of PAA molecules varies with the degree of dissociation of carboxyl groups in the structure.
On the other hand, at the higher pH side, the amount of adsorbed PAA was only 0.2 mass% due to its largely occupied volume derived from the well-stretched PAA structure and intermolecular electrostatic repulsion among PAA molecules.
Pb2+ is known to be very harmful to environment and human body and the dissolution of Pb 2+ in the PZT structure into the water by hydrolysis has some undesired influences on surface condition of PZT particles, sinterability and electrical properties of resultant PZT ceramics.
Online since: August 2014
Authors: Stanislav Pospíšil, Jiří Náprstek
Both latter branches deal very often with the
vibration of slender structures under the excitation of deterministic (pseudo-steady wind) wind load
with the combination of noisy (turbulence) additive force.
It is still often assumed that contribution of the noise in the non-resonant part of the frequency spectra is decreasing the overall response of the structure, because it is acting in the disordering manner.
SR has been surmised in physical chemistry in early forties, see e.g. [3].
The aim of this paper is to investigate whether the undesired - harmful - SR can be achieved in the field of structures loaded by the turbulent wind.
It is still often assumed that contribution of the noise in the non-resonant part of the frequency spectra is decreasing the overall response of the structure, because it is acting in the disordering manner.
SR has been surmised in physical chemistry in early forties, see e.g. [3].
The aim of this paper is to investigate whether the undesired - harmful - SR can be achieved in the field of structures loaded by the turbulent wind.
Online since: May 2011
Authors: Jin Xi Wang, Ya Jun Wang
The chemistry of naturally occurring chromium and various chromium compounds into soil is important, which influences plant uptake and animal and human nutrition.
In addition, hexavalent chromium dominated as Cr2O72- structure and had higher Eθ = 1.33V at pH < 6, however, hexavalent chromium dominated as CrO42- structure and had only low Eθ = –0.13V at pH > 6, so the Eθ value of the redox system of reducing Cr (VI) to Cr (III) could increases with the decline of the pH value[7].
Humic acid could also improve granular structure, buffer the acidity and saline-alkali of the soil and so on.
In addition, hexavalent chromium dominated as Cr2O72- structure and had higher Eθ = 1.33V at pH < 6, however, hexavalent chromium dominated as CrO42- structure and had only low Eθ = –0.13V at pH > 6, so the Eθ value of the redox system of reducing Cr (VI) to Cr (III) could increases with the decline of the pH value[7].
Humic acid could also improve granular structure, buffer the acidity and saline-alkali of the soil and so on.
Online since: October 2010
Authors: Xin Zhe Lan, Xiang Yang Chen, Lin Bo Li, Tang Hua Hu, Yu Hong Tian
The specific surface area and the porous structure of the prepared activated carbon were measured by N2 adsorption at 77K with an automated adsorption apparatus (Micromeritics, ASAP 2020).
Results and discussion Characterization of pore structure of the activated carbon.
Fig. 1 Adsorption isotherm of the Fig. 2 Pore size distribution of the activated carbon activated carbon As shown in Fig.1, the isotherm belongs to type II according to the International Union of Pure and Applied Chemistry (IUPAC) classification.
The isotherm indicates that the sample is of mesoporous structure which contains plenty of mesopores, micropores and few macropores.
Results and discussion Characterization of pore structure of the activated carbon.
Fig. 1 Adsorption isotherm of the Fig. 2 Pore size distribution of the activated carbon activated carbon As shown in Fig.1, the isotherm belongs to type II according to the International Union of Pure and Applied Chemistry (IUPAC) classification.
The isotherm indicates that the sample is of mesoporous structure which contains plenty of mesopores, micropores and few macropores.
Online since: December 2012
Authors: Zhi Fu Yang, Qing Yuan Meng, Kang You Zhong
The previous research results showed that the misfit dislocations in the zinc-blende structure are mainly of the 60° type [3], which lie on {111} slip planes and possess a Burgers vector of , where is the lattice parameter.
The core structure of the shuffle 60° dislocation firstly proposed by Hornstra [13] is characterized by an 8-atom ring, including a 3-coordinated atom and a dangling bond oriented along <111> direction.
Recently, Pizzagalli et al. [14] found that this core structure is metastable in density-functional theory calculations.
Hornstra, Journal of Physics and Chemistry of Solids 5 (1-2) (1958) 129 [14] L.
The core structure of the shuffle 60° dislocation firstly proposed by Hornstra [13] is characterized by an 8-atom ring, including a 3-coordinated atom and a dangling bond oriented along <111> direction.
Recently, Pizzagalli et al. [14] found that this core structure is metastable in density-functional theory calculations.
Hornstra, Journal of Physics and Chemistry of Solids 5 (1-2) (1958) 129 [14] L.
Online since: December 2013
Authors: Zhi Min Wang, Yong Hong Zhou, Xiao Hui Yang, Fei Jing, Li Hong Hu
They possess a common characteristic in their chemical structures, i.e., unsaturated chain–like the fifteen carbon atom chain in the meta position.
Because of its unique structure with phenolic and aliphatic group, become a versatile industrial raw materials, which has been widely used as modifiers of the phenolic resin, rubber plasticizers, coatings and adhesives, etc[6].
Polan, in: “Synthesis of modified phenolic resins using renewable materials for advanced composites in civil engineering structures,” Toowoomba: Bachelor of Civil Engineering In University of Southern Queensland, (2010), p. 22 [6] Y.
Li: Chinese Journal of Applied Chemistry Vol. 27 (2010), p. 866 [13] J.H.P.
Because of its unique structure with phenolic and aliphatic group, become a versatile industrial raw materials, which has been widely used as modifiers of the phenolic resin, rubber plasticizers, coatings and adhesives, etc[6].
Polan, in: “Synthesis of modified phenolic resins using renewable materials for advanced composites in civil engineering structures,” Toowoomba: Bachelor of Civil Engineering In University of Southern Queensland, (2010), p. 22 [6] Y.
Li: Chinese Journal of Applied Chemistry Vol. 27 (2010), p. 866 [13] J.H.P.
Online since: February 2004
Authors: David John Smith, T.R.A. Pearce, N.P. Smith, M.N.R. Ashfold, P. Comley
Ashfold
4
1
Cranfield Precision, 90 Central Avenue, Cranfield, Beds, MK43 0JR, UK
2
Department of Mechanical Engineering, University of Bristol, Bristol, BS1 5LT, UK
3
IGT, University of Bristol, Bristol, BS1 5LT, UK
4
School of Chemistry, University of Bristol, Bristol, BS1 5LT, UK
Keywords: Grinding, Precision, Diamond Fibre
Abstract.
Diamond coated fibres have been produced by a hot filament CVD technique, where the surface of the fibres has a faceted structure making them suitable for use as an abrasive medium.
Diamond is deposited onto the wire and the resulting crystal structure is shown in Fig. 1.
Roughness figures of 70nm Ra were obtained with optical quality surfaces, while inspection of the surface structure confirmed that the material removal was of a ductile nature.
Diamond coated fibres have been produced by a hot filament CVD technique, where the surface of the fibres has a faceted structure making them suitable for use as an abrasive medium.
Diamond is deposited onto the wire and the resulting crystal structure is shown in Fig. 1.
Roughness figures of 70nm Ra were obtained with optical quality surfaces, while inspection of the surface structure confirmed that the material removal was of a ductile nature.
Online since: December 2015
Authors: Udom Tipparach, Buagun Samran, Emmanuel Nyambod Timah
The one dimensional structure of TNT provides a direct path for electrons.
During the anodization process, preparation parameters influencing the structure of TNT have been reported.
For each sample the nanotubes were homogenous in size with a tubular structure.
Macak et al, Journal of Electroanalytical Chemistry. 621(2008), 254-266 [24] Rui Liu et al, Thin Solid Films. 519(2011), 6459-6466 [25] Ho Chang, Chih-Hao C., Mu-Jung K., et al, Applied Surface Science 275(2013), 252-257 [26] Hun Park et al, Solar Energy Materials & Solar Cells. 95(2011), 184-189
During the anodization process, preparation parameters influencing the structure of TNT have been reported.
For each sample the nanotubes were homogenous in size with a tubular structure.
Macak et al, Journal of Electroanalytical Chemistry. 621(2008), 254-266 [24] Rui Liu et al, Thin Solid Films. 519(2011), 6459-6466 [25] Ho Chang, Chih-Hao C., Mu-Jung K., et al, Applied Surface Science 275(2013), 252-257 [26] Hun Park et al, Solar Energy Materials & Solar Cells. 95(2011), 184-189
Online since: September 2020
Authors: Jia Xin Sun, Xin Gu, Bing Qin Zhou
Effects of Radio-Frequency Power and Deposition Pressure on Structures and Properties of Silicon-Rich Silicon Nitride Thin Films
Sun Jiaxina, Zhou Bingqingb*, Gu Xinc
Key Laboratory of Physics and Chemistry for Functional Material, College of Physics and Electron Information, Inner Mongolia Normal University, Huhhot 010022, China
a2637255253@qq.com, bzhoubq@imnu.edu.cn, c1558910050@qq.com
Keywords: plasma enhanced chemical vapor deposition, silicon-rich silicon nitride film, RF power, deposition pressure, microstructure.
Fourier transform infrared spectroscopy (FTIR) is a non-destructive analytical technique with highly characteristic, which is mainly used to study the vibrational spectra, molecular structure, chemical bond properties and lattice dynamics of atoms and molecules[6].
Fig. 5 FTIR spectra of samples Fig. 6 FTIR spectra of samples at different power at different pressure To further study the internal structure of these thin films, the atomic content of these films was calculated at different powers and pressures using [H]=[Si-H]+[N-H]
Research on Nitride Membranes Grown by PECVD, J.Nanomater&structure.47(5)(2009)267-303
Fourier transform infrared spectroscopy (FTIR) is a non-destructive analytical technique with highly characteristic, which is mainly used to study the vibrational spectra, molecular structure, chemical bond properties and lattice dynamics of atoms and molecules[6].
Fig. 5 FTIR spectra of samples Fig. 6 FTIR spectra of samples at different power at different pressure To further study the internal structure of these thin films, the atomic content of these films was calculated at different powers and pressures using [H]=[Si-H]+[N-H]
Research on Nitride Membranes Grown by PECVD, J.Nanomater&structure.47(5)(2009)267-303