Sort by:
Publication Type:
Open access:
Publication Date:
Periodicals:
Search results
Online since: March 2020
Authors: A. Uma Maheswari, Manickam Sivakumar, K.K. Anjali
Reports show that structural and optical properties of TiO2 nanostructures depend on its structure, size and morphology.
The structure of T1 and T2 is studied using X-ray diffraction analysis (Fig. 1).
It shows both T1 and T2 exhibit anatase structure and a minor amount of rutile content is present in T2.
The XRD profile reveals that sample calcined at 300 °C is of anatase structure whereas the sample obtained on thermal treatment at 600 °C possesses a small percentage of rutile phase.
[7] Nowotny, M.K., et al., The Journal of Physical Chemistry C, 2008. 112(14): p. 5275-5300
The structure of T1 and T2 is studied using X-ray diffraction analysis (Fig. 1).
It shows both T1 and T2 exhibit anatase structure and a minor amount of rutile content is present in T2.
The XRD profile reveals that sample calcined at 300 °C is of anatase structure whereas the sample obtained on thermal treatment at 600 °C possesses a small percentage of rutile phase.
[7] Nowotny, M.K., et al., The Journal of Physical Chemistry C, 2008. 112(14): p. 5275-5300
Online since: August 2014
Authors: Ping Jie Huang, Di Bo Hou, Guang Xin Zhang, Xu Sheng Kang, Xian Li, Jin Hui Cai
But paraffin wax is a mixture of various alkanes, and its internal structure is very complex, such as a kind of industrial grade paraffin wax for crossbow consists mainly 9 different ingredients: 23-alkane~31-alkane[14].Therefore, it is more difficult to precisely the three different types of paraffin wax.
The operation of current used methods, like nuclear magnetic resonance, liquid chromatography, gas chromatography, and mass spectrometry and so on, to identify the composition or structure of paraffin waxes is generally more complex[9, 13, 14].
Journal of Molecular Structure. 2014, In Press
Chinese Journal of Analytical Chemistry. 2009, 32(12): 1765-1770
Structure Analysis of the Was(In Chinese)[J].
The operation of current used methods, like nuclear magnetic resonance, liquid chromatography, gas chromatography, and mass spectrometry and so on, to identify the composition or structure of paraffin waxes is generally more complex[9, 13, 14].
Journal of Molecular Structure. 2014, In Press
Chinese Journal of Analytical Chemistry. 2009, 32(12): 1765-1770
Structure Analysis of the Was(In Chinese)[J].
Online since: July 2021
Authors: Konstantin M. Kolmakov, Alexander E. Zverovshchikov
• industrially produced powders have a shape and fractional composition, unsuitable for the implementation of technology or obtaining a high-quality structure of products.
Organization of production of powder raw materials for additive and instrumental industries Current State of Technology for the Production of Dispersed Powders From 1973 to 2017, the properties and phase transformations of the W-C system, studies of the structure and properties of individual phases (W2C; WC; WCi-x), the synthesis of carbides, and the formation of coatings were devoted to over 600 works The composition and properties of the powder depend on the method of its preparation, each of which has a number of disadvantages (table 1.) [1 - 5].
This ensures the production of more uniform particles of the WC powder, both in size and shape, and in the stability of the structure of the material of the particles.
Rotation of the destructible electrode provides a stable condition for arc burning in the cathode spot area, leveling the differences in the structure of the destructible electrode material So that the volume of the evaporated metal does not exceed 9% of the total volume of the molten metal, since this will reduce the content of particles of the fine fraction in the resulting one, the power of the electric arc should be determined by the relation (2).
Physics and chemistry of materials processing.
Organization of production of powder raw materials for additive and instrumental industries Current State of Technology for the Production of Dispersed Powders From 1973 to 2017, the properties and phase transformations of the W-C system, studies of the structure and properties of individual phases (W2C; WC; WCi-x), the synthesis of carbides, and the formation of coatings were devoted to over 600 works The composition and properties of the powder depend on the method of its preparation, each of which has a number of disadvantages (table 1.) [1 - 5].
This ensures the production of more uniform particles of the WC powder, both in size and shape, and in the stability of the structure of the material of the particles.
Rotation of the destructible electrode provides a stable condition for arc burning in the cathode spot area, leveling the differences in the structure of the destructible electrode material So that the volume of the evaporated metal does not exceed 9% of the total volume of the molten metal, since this will reduce the content of particles of the fine fraction in the resulting one, the power of the electric arc should be determined by the relation (2).
Physics and chemistry of materials processing.
Online since: September 2008
Authors: Norio Shinya
Provided the short time holding at service temperatures removes the creep cavities, it is
possible to extend the service lives of high temperature plants and structures significantly.
These sintering treatments, however, are not realistic to put into practice in high temperature plants and structures.
The chemistry of the creep cavity surface in both the steels was examined by Auger electron spectroscopy (AES).
It is indicated clearly that the BN precipitation is an excellent method not only to extend lives of high temperature structures by providing them with self healing ability but also develop superior heat resisting steels by preventing the notorious grain boundary creep fracture.
Owing to the simple methods and low cost, the self healing methods would be applied to a lot of materials and contribute to prevention against failures of plants and structures in the near future.
These sintering treatments, however, are not realistic to put into practice in high temperature plants and structures.
The chemistry of the creep cavity surface in both the steels was examined by Auger electron spectroscopy (AES).
It is indicated clearly that the BN precipitation is an excellent method not only to extend lives of high temperature structures by providing them with self healing ability but also develop superior heat resisting steels by preventing the notorious grain boundary creep fracture.
Owing to the simple methods and low cost, the self healing methods would be applied to a lot of materials and contribute to prevention against failures of plants and structures in the near future.
Online since: October 2008
Authors: Fei Qiao, Wei Lin, C.K. Chau, Zongjin Li
Introduction
The interruption of public traffic or the usage of structures caused by repair operation, can increase
costs of traffic and building operation, which may be much more expensive than the repair itself.
The performance, especially the setting time of MPC, is greatly influenced by the structure of magnesia, which is the main constituent of MPC.
But the structure of magnesia is affected by many factors including calcination temperature, grinding and even the precursor used to produce magnesia.
Thus the reactivity evaluation based on the chemistry method should be developed for convenient and reliable measurement.
According to the above explanation, the optimum M/P depends mainly on the 10 20 30 40 50 60 70 80 20 40 60 80 100 MH Content (%) Strength (Mpa) 0 10 20 30 40 Setting time (min) . 1-D 3-D 7-D 28-D Setting Fig. 3 - Effect of MH content on the strength and setting of MPC physical properties of magnesia, including reactivity, particle size, surface structure, MgO content, etc.
The performance, especially the setting time of MPC, is greatly influenced by the structure of magnesia, which is the main constituent of MPC.
But the structure of magnesia is affected by many factors including calcination temperature, grinding and even the precursor used to produce magnesia.
Thus the reactivity evaluation based on the chemistry method should be developed for convenient and reliable measurement.
According to the above explanation, the optimum M/P depends mainly on the 10 20 30 40 50 60 70 80 20 40 60 80 100 MH Content (%) Strength (Mpa) 0 10 20 30 40 Setting time (min) . 1-D 3-D 7-D 28-D Setting Fig. 3 - Effect of MH content on the strength and setting of MPC physical properties of magnesia, including reactivity, particle size, surface structure, MgO content, etc.
Online since: January 2012
Authors: Jian Zhong Ma, Chao Hua Xue, Wei Yin, Shun Tian Jia
UV-Durable Superhydrophobic Textiles with UV-Shielding Property by Coating Fibers with ZnO/SiO2 Core/Shell Particles
Chaohua XUE1, 2, a, Wei YIN1, Shuntian JIA1 and Jianzhong MA1, 2
1College of Resource and Environment, Shaanxi University of Science and Technology,
Xi’an 710021, China
2Key Laboratory of Auxiliary Chemistry and Technology for Light Chemical Industry, Ministry of Education, Shaanxi University of Science and Technology, Xi’an 710021, China
axuech@zju.edu.cn (corresponding author)
Keywords: Superhydrophobic surface; UV-shielding property; Core/shell; Textiles; Electrostatic assembly.
It can be seen that all the particles were coated with the multilayer polyelectrolytes and the silica shell were successfully coated on the nanoscale ZnO surface, forming typical core/shell structures. 3.2 Morphology of Textiles Fig.2 SEM images of (a) original PET textiles; (b) hydrolyzed PET textiles; (c) ZnO/SiO2 coated hydrolyzed PET textiles.
It can be seen that pure hydrolyzed PET textiles show low transmittance in the visible range, due to the light reflection and refraction induced by the fibrous structure.
The dual-size roughness caused by the fibrous structure in combination with the coating of particles on fiber surface and the low surface energy of HDTMS led to predominant superhydrophobic surfaces with contact angles greater than 150°.
Tsujii, Super Water- and Oil-Repellent Surfaces Resulting from Fractal Structure, Journal of Colloid and Interface Science. 208 (1998) 287-294
It can be seen that all the particles were coated with the multilayer polyelectrolytes and the silica shell were successfully coated on the nanoscale ZnO surface, forming typical core/shell structures. 3.2 Morphology of Textiles Fig.2 SEM images of (a) original PET textiles; (b) hydrolyzed PET textiles; (c) ZnO/SiO2 coated hydrolyzed PET textiles.
It can be seen that pure hydrolyzed PET textiles show low transmittance in the visible range, due to the light reflection and refraction induced by the fibrous structure.
The dual-size roughness caused by the fibrous structure in combination with the coating of particles on fiber surface and the low surface energy of HDTMS led to predominant superhydrophobic surfaces with contact angles greater than 150°.
Tsujii, Super Water- and Oil-Repellent Surfaces Resulting from Fractal Structure, Journal of Colloid and Interface Science. 208 (1998) 287-294
Online since: October 2016
Authors: Antal Jákli, John L. West, Jun Ren Wang
Airbrushed Liquid Crystal/Polymer Fibers for Responsive Textiles
John L West1,2,a *, Junren Wang1,2,b and Antal Jákli1,c
1Liquid Crystal Institute, Kent State University, Kent, OH 44240, USA
2Department of Chemistry and Biochemistry, Kent State University, Kent, OH 44240, USA
ajlwest@kent.edu, bjwang45@kent.edu, cajakli@kent.edu
Keywords: airbrushing, core/sheath, liquid crystals, phase separation, responsive fibers
Abstract.
Functional fiber-based structures are highly desirable for wearable technology products.
We also present and discuss how to tune the morphology of the resulting LC/polymer structures from beads to beaded fibers to uniform fibers.
The solvent rapidly evaporates leaving the liquid crystal polymer structures (beads or fibers).
The hollow core structures shown in Fig. 4aʹʹ and Fig. 4cʹʹ after LC evaporation confirm that liquid crystals (E7) was encapsulated by polymer sheath.
Functional fiber-based structures are highly desirable for wearable technology products.
We also present and discuss how to tune the morphology of the resulting LC/polymer structures from beads to beaded fibers to uniform fibers.
The solvent rapidly evaporates leaving the liquid crystal polymer structures (beads or fibers).
The hollow core structures shown in Fig. 4aʹʹ and Fig. 4cʹʹ after LC evaporation confirm that liquid crystals (E7) was encapsulated by polymer sheath.
Online since: June 2015
Authors: Azizan Ahmad, M.P. Abdullah, M.A. Ghani, Nadhratun Naiim Mobarak
The selection of kappa carrageenan as host polymer because it has oxygen atom in its chemical structure as shown in Fig. 1 which important to ensure coordination with cations.
Fig. 1 The chemical structure of kappa carrageenan Result and discussion The chemical interactions that occur between acetic acid solution and polymer matrix were examined by using infrared spectroscopy.
The disruption in the hydrogen bonding suppresses the crystalline structure on kappa carrageenan matrix, allowing more amorphous regions to be available to ease the mobility of H+ ions that are responsible in enhancing the ionic conductivity [18-20].
Materials Chemistry and Physics, 82 (2), 478 – 483
Solid State Ionics 148: 467–473 [23] Winie T, Ramesh S, Arof AK (2009) Studies on the structure and transport properties of hexanoyl chitosan-based polymer electrolytes.
Fig. 1 The chemical structure of kappa carrageenan Result and discussion The chemical interactions that occur between acetic acid solution and polymer matrix were examined by using infrared spectroscopy.
The disruption in the hydrogen bonding suppresses the crystalline structure on kappa carrageenan matrix, allowing more amorphous regions to be available to ease the mobility of H+ ions that are responsible in enhancing the ionic conductivity [18-20].
Materials Chemistry and Physics, 82 (2), 478 – 483
Solid State Ionics 148: 467–473 [23] Winie T, Ramesh S, Arof AK (2009) Studies on the structure and transport properties of hexanoyl chitosan-based polymer electrolytes.
Online since: October 2013
Authors: Qin Hui Gong, Ting Gui Li
The structure diagram of the sinter mixture moisture control system based on fuzzy PID controller is shown in Figure 2.
Structure diagram of the sinter mixture moisture control system based on fuzzy PID controller A.
The laboratories of factories and mines test the moisture demand to get the theoretical data during the sintering process of different raw materials, and then mixture moisture target midline is determined according to the structure of mixture ratio in practical production.
Design of the parameter self-tuning fuzzy PID controller Due to the external interference factors or the system load changes, the characteristic parameters or structure of the sintering mixture control system will be changed.
References [1] Luefeng Chen,Min Wu,Weihua Cao.Raw material conditions-adaptive based moisture control system for sintering granulation process[J].Computer and applied chemistry,2011,(07):12-13 [2] Jianjie Sun.Water control automatically for sinter mixed charge and the lectotype of major equipment[J].Nangang Science and management, 2005,(02):76-78 [3] Hongwen Wang,Xiaowei He,Yuexin Lin.Fuzzy adaptive fractional PIλDu control for water addition in sintering process[J].Instrument technique and sensor,2012,(2):78-81 [4] Liangpei Huang,Yilun Liu,Xiaoyan Yang.Application of parameter self-adaptive fuzzy PID controller in water supply system of constant pressure[J].mining machinery :2005,33(7):82-84 [5] Yu Meng,Xiaohua Peng, Hao Zhang.Seif-adaptive adjustment of fuzzy-PID controller and its simulation study[J].Mechanical engineering and automation,2006(6) [6] Juanfang Hao.Applications of fuzzy PID control technology in control system of sintering burdening[J].Science and technology of baotou
Structure diagram of the sinter mixture moisture control system based on fuzzy PID controller A.
The laboratories of factories and mines test the moisture demand to get the theoretical data during the sintering process of different raw materials, and then mixture moisture target midline is determined according to the structure of mixture ratio in practical production.
Design of the parameter self-tuning fuzzy PID controller Due to the external interference factors or the system load changes, the characteristic parameters or structure of the sintering mixture control system will be changed.
References [1] Luefeng Chen,Min Wu,Weihua Cao.Raw material conditions-adaptive based moisture control system for sintering granulation process[J].Computer and applied chemistry,2011,(07):12-13 [2] Jianjie Sun.Water control automatically for sinter mixed charge and the lectotype of major equipment[J].Nangang Science and management, 2005,(02):76-78 [3] Hongwen Wang,Xiaowei He,Yuexin Lin.Fuzzy adaptive fractional PIλDu control for water addition in sintering process[J].Instrument technique and sensor,2012,(2):78-81 [4] Liangpei Huang,Yilun Liu,Xiaoyan Yang.Application of parameter self-adaptive fuzzy PID controller in water supply system of constant pressure[J].mining machinery :2005,33(7):82-84 [5] Yu Meng,Xiaohua Peng, Hao Zhang.Seif-adaptive adjustment of fuzzy-PID controller and its simulation study[J].Mechanical engineering and automation,2006(6) [6] Juanfang Hao.Applications of fuzzy PID control technology in control system of sintering burdening[J].Science and technology of baotou
Online since: March 2005
Authors: A.K. Arof, R. Puteh, M.Z.A. Yahya
Fig. 1 shows the structure of chitosan.
The rigid structure of chitosan lead to high glass transition temperature, Tg.
Structure of chitosan-lithium salt complex.
Shriver: Chemistry Material Vol. 10 (1998), p. 2307
Structure Vol. 524 (2000), p. 201
The rigid structure of chitosan lead to high glass transition temperature, Tg.
Structure of chitosan-lithium salt complex.
Shriver: Chemistry Material Vol. 10 (1998), p. 2307
Structure Vol. 524 (2000), p. 201