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Online since: September 2013
Authors: Xiao Xue Zhang, Li Xing Dai, Jun Sun, Jian Jun Wang
Preparation and characterization of pH-responsive poly (vinyl -alcohol)/sodium carboxymethylcellulose nanofibers
Xiaoxue Zhang1, Jun Sun1, Jianjun Wang1 and Lixing Dai1*
1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, 199 Renai Road, Suzhou 215123, China
Corresponding author’s email: dailixing@suda.edu.cn
Keywords: polyvinyl alcohol; electrospinning; hydrogen bonds; swelling
Abstract. pH-sensitivity nanofibers composited of poly(vinyl alcohol) (PVA) and sodium carboxymethylcellulose (Na-CMC) were prepared by electrospining.
The structure, properties, and morphology of the nanofibers were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray differential (XRD), scanning electron microscopy (SEM) and pH-sensitivity testing.
The structure, properties of the fiber mats were characterized by fourier FTIR, XRD and SEM.
FTIR (Nicolet-6700, Thermo Nicolet, USA) was used to identify the structure of the fiber mats in the spectral region of 4,000-400 cm-1.
The structure, properties, and morphology of the nanofibers were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray differential (XRD), scanning electron microscopy (SEM) and pH-sensitivity testing.
The structure, properties of the fiber mats were characterized by fourier FTIR, XRD and SEM.
FTIR (Nicolet-6700, Thermo Nicolet, USA) was used to identify the structure of the fiber mats in the spectral region of 4,000-400 cm-1.
Online since: February 2011
Authors: Yan Hong Zhao, Li Chun Hou, Xiao Jing Wang, Wen Fei Liu, Wen Ming Tong, Sheng Liang, Min Sun
Electrochemical Behaviour of Ce Doped Ta2O5 Film Electrode
Yanhong Zhao1, a, , Lichun Hou1, b, Wenfei Liu1, c, Wenming Tong1, d, Sheng Liang1, e, Min Sun1, f, Xiaojing Wang1, g
College of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot, China, 010021
aceyanhong@imu.edu.cn, b309200249@qq.com, cwenfeixue@sina.com, dwmtong@foxmail.com, e13734715395@qq.com, fqq251365498@sina.com, gwang_xiao_jing@hotmail.com
Keywords: Tantalum Oxide, Cyclic Voltgrammetry, Dope, Film Electrode.
In addition, the phase structure of Ce-Ta2O5 prepared was performed by X-ray diffraction (XRD).
In addition, the crystal structure of Ce-Ta2O5 was studied with X-ray diffraction.
The phase structure was identified by X-ray diffraction (D8-ADVANCE, Bruker, Germany) with Cu Kα (λ= 1.5406 Å) radiation at a scan rate of 0.02 2θ S-1.
In addition, the phase structure of Ce-Ta2O5 prepared was performed by X-ray diffraction (XRD).
In addition, the crystal structure of Ce-Ta2O5 was studied with X-ray diffraction.
The phase structure was identified by X-ray diffraction (D8-ADVANCE, Bruker, Germany) with Cu Kα (λ= 1.5406 Å) radiation at a scan rate of 0.02 2θ S-1.
Online since: October 2007
Authors: Morihiro Saito, Jun Kuwano, Masafumi Mikami, Kiyofumi Yamagiwa, Yuriko Iwao, Tsuneharu Takeuchi
Liquid-phase Synthesis
of Carbon Nanotubes from Alcohols
Kiyofumi Yamagiwa, Yuriko Iwao, Masafumi Mikami, Tsuneharu Takeuchi,
Morihiro Saito, Jun Kuwano
Department of Industrial Chemistry, Faculty of Engineering, Tokyo University of Science,
12-1 Ichigayafunagawara-cho, Shinjuku-ku, Tokyo 162-0826, Japan
Keywords: Carbon nanotube, Resistance heating, Aligned, Stainless steel, Alcohol
ABSTRACT
Vertically aligned carbon nanotubes (CNTs) were grown on a stainless steel substrate (SUS304)
by resistance-heating method in alcohols containing homogeneously dissolved cobaltocene
Co(C5H5)2 as a catalyst source.
Straight-chain primary alcohols, 1,2-ethanediol and cyclohexanol were used as carbon sources to examine the effects of the molecular structures on the morphology of the aligned CNTs.
Straight-chain primary alcohol with nc=1-6 (nc: the number of carbon atoms), 1,2-ethanediol and cyclohexanol were used as a carbon source to examine the effects of the molecular structures on the morphologies and alignment of CNTs.
These results reveal that the growth of CNTA is considerably influenced by the difference in molecular structure between 1-hexanol and cyclohexanol.
Straight-chain primary alcohols, 1,2-ethanediol and cyclohexanol were used as carbon sources to examine the effects of the molecular structures on the morphology of the aligned CNTs.
Straight-chain primary alcohol with nc=1-6 (nc: the number of carbon atoms), 1,2-ethanediol and cyclohexanol were used as a carbon source to examine the effects of the molecular structures on the morphologies and alignment of CNTs.
These results reveal that the growth of CNTA is considerably influenced by the difference in molecular structure between 1-hexanol and cyclohexanol.
Online since: June 2014
Authors: Silas Cardoso Santos, W. Acchar, S.R.H. Mello-Castanho, C. Yamagata
Based on the results, the weight and morphology of porous structure samples were directly influenced by immersion time, whereby intervals from 30-120min showed the best final products.
Lighting emission by gas combustion in porous components is more efficient rather than a free flame, seeing that porous structures work as a heat circulator improving flame speed and stability[1].
As soon as this force started decreasing, a process of recovering the structure of ceramic suspension forward to its initial state began.
N., WIDIYASTUTI, W., OGI, T., et al., Correlations between crystallite/particle size and photoluminescence properties of submicrometer phosphors, Chemistry of Materials, vol. 19, pp. 1723-1730, 2007
Lighting emission by gas combustion in porous components is more efficient rather than a free flame, seeing that porous structures work as a heat circulator improving flame speed and stability[1].
As soon as this force started decreasing, a process of recovering the structure of ceramic suspension forward to its initial state began.
N., WIDIYASTUTI, W., OGI, T., et al., Correlations between crystallite/particle size and photoluminescence properties of submicrometer phosphors, Chemistry of Materials, vol. 19, pp. 1723-1730, 2007
Online since: December 2011
Authors: Yan Dong, Mei Li
Using linear symbol notation of chemical compounds in chemical database for reference, encode to constraint structure of geometry graphics, establish recognition mechanism of geometric characteristics by structure codes.
Realize the feature recognition of part drawing by matching structure codes.
Specification Expression of Constraint Structure In order to guarantee the generated graphics constraint structure is unique and consistency, the definition of geometric feature constraint structure must be followed certain rules
The Linear Symbols Description of Constraint Structure The linear symbols description means to descript the constraint structure with linear sequences of words and numbers.
Comparing sub-graph with chemistry molecular graphs, geometric elements type corresponds to atomic type, relationship constraint corresponds to the bonding property, so that linear symbol representation can be learn from the chemical compounds in a database, and the encoding method of the graph constraint structure can be built.
Realize the feature recognition of part drawing by matching structure codes.
Specification Expression of Constraint Structure In order to guarantee the generated graphics constraint structure is unique and consistency, the definition of geometric feature constraint structure must be followed certain rules
The Linear Symbols Description of Constraint Structure The linear symbols description means to descript the constraint structure with linear sequences of words and numbers.
Comparing sub-graph with chemistry molecular graphs, geometric elements type corresponds to atomic type, relationship constraint corresponds to the bonding property, so that linear symbol representation can be learn from the chemical compounds in a database, and the encoding method of the graph constraint structure can be built.
Online since: March 2020
Authors: S.K. Mohamed, A.A. Mohamed, E.A. Abdel-Mawla, Mohamed M. Rashad, Diaa A. Rayan
Result and Discussion
a) X-ray diffraction analysis
The structure and phase purity of as prepared products were confirmed by analyzing the observed powder X-ray diffraction (XRD) patterns.
Clearly, BiFeO3 nanoparticles with spherical like structure was distributed in narrow size distribution between between 25.6 to 48.1 nm as shown in Fig 2(a).
The microstructure of pure BiFeO3 nanoparticles was exhibited spherical structure with narrow size distribution between 25.6 to 48.1 nm.
Molecular Structure, 2013, 1038, 242–249
Araújo and S.Ferdov, Royal Society of Chemistry 2014 Dalton Trans.,2014,43,18010–18016 | 18011
Clearly, BiFeO3 nanoparticles with spherical like structure was distributed in narrow size distribution between between 25.6 to 48.1 nm as shown in Fig 2(a).
The microstructure of pure BiFeO3 nanoparticles was exhibited spherical structure with narrow size distribution between 25.6 to 48.1 nm.
Molecular Structure, 2013, 1038, 242–249
Araújo and S.Ferdov, Royal Society of Chemistry 2014 Dalton Trans.,2014,43,18010–18016 | 18011
Online since: November 2003
Authors: E. Antoncik
First we shall discuss the physical limitations
of these equations and the necessity to generalise them according to the common rules
well known in physical chemistry.
Fortunately this problem can be solved very easily using the common rules of physical chemistry [5].
According to chemistry of nonideal solutions this is always necessary if the particles in this case the dopants interact with one another at high concentrations.
Although the properties of non-ideal (i.e. interacting) solutions are extensively studied in chemistry some physicists prefer probably because of the simplicity to neglect the interaction of dopants at very high concentrations without being aware of the fact that this simple approximation can be totally useless in this concentration region.
The reason is that even in the simple case with a constant distribution of the vacancies the evaluation of the solubility limit would necessitate exceedingly laborious total-energy calculations based on a detailed knowledge of the band structure of several crystal lattices including the influence of the defects and their interaction.
Fortunately this problem can be solved very easily using the common rules of physical chemistry [5].
According to chemistry of nonideal solutions this is always necessary if the particles in this case the dopants interact with one another at high concentrations.
Although the properties of non-ideal (i.e. interacting) solutions are extensively studied in chemistry some physicists prefer probably because of the simplicity to neglect the interaction of dopants at very high concentrations without being aware of the fact that this simple approximation can be totally useless in this concentration region.
The reason is that even in the simple case with a constant distribution of the vacancies the evaluation of the solubility limit would necessitate exceedingly laborious total-energy calculations based on a detailed knowledge of the band structure of several crystal lattices including the influence of the defects and their interaction.
Online since: April 2024
Authors: Ismed Ismed, Rina Yenrina, Hasbullah Hasbullah, Yusniwati Yusniwati, Daimon Syukri, Tuty Anggraini, Annisa Rizki Mardiah
Proteins comprise amino acid chains connected by peptide bonds to form complex structures.
In: Food Chemistry: Principles and Applications, Royal Society of Chemistry, 2017, pp. 175-194
The Journal of Biological Chemistry, 193 (1951), 265-275
Jyothirmayi, Fish protein hydrolysates: Proximate composition, amino acid composition, antioxidant activities, and applications: A review, Food Chemistry (Birch ed.). 135(4) (2012) 3020–3038
In: Food Chemistry: Principles and Applications, Royal Society of Chemistry, 2017, pp. 175-194
The Journal of Biological Chemistry, 193 (1951), 265-275
Jyothirmayi, Fish protein hydrolysates: Proximate composition, amino acid composition, antioxidant activities, and applications: A review, Food Chemistry (Birch ed.). 135(4) (2012) 3020–3038
Online since: November 2016
Authors: Tanja Pettersen, Bjørn Holmedal, Knut Marthinsen, Jesper Friis, Antonio Segatori, Kai Zhang
Moreover it is often a challenge to produce extrusions with a consistent and homogenous grain structure and texture along as well as through the cross section of the profiles.
From these the deformation texture and grain structure are calculated with an appropriate deformation texture model and a sub-structure evolution model, respectively.
By combining the solution for the dislocation storage problem with models for dynamic recovery of network dislocations and sub-boundary structures, a general internal state variable description is obtained for the sub-structure after deformation, proposed by Nes [6] and further developed by Nes, Marthinsen and co-workers [7-10].
By coupling FEM, Alamel and the ALFLOW model, the sub-structure at Path 20%, Path 80% and Path 90% were calculated.
The RX behaviours for annealing at 450 ºC were simulated using the ALSOFT for the 20%, 80% and 90% paths, based on the ALFLOW sub-structure predictions.
From these the deformation texture and grain structure are calculated with an appropriate deformation texture model and a sub-structure evolution model, respectively.
By combining the solution for the dislocation storage problem with models for dynamic recovery of network dislocations and sub-boundary structures, a general internal state variable description is obtained for the sub-structure after deformation, proposed by Nes [6] and further developed by Nes, Marthinsen and co-workers [7-10].
By coupling FEM, Alamel and the ALFLOW model, the sub-structure at Path 20%, Path 80% and Path 90% were calculated.
The RX behaviours for annealing at 450 ºC were simulated using the ALSOFT for the 20%, 80% and 90% paths, based on the ALFLOW sub-structure predictions.