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Online since: October 2023
Authors: Nathapong Sukhawipat, Laksana Saengdee, Narongrit Sosa, Pongtanawat Khemthong, Jatuporn Wittayakun, Pamela Pasetto
Preparation and Characterization of a Novel Additive for Elastomeric Polymer from Oligoisoprene Modified Mesoporous Silica
Nathapong Sukhawipat1,a*, Laksana Saengdee2,b, Narongrit Sosa3,c, Pongtanawat Khemthong4,d, Jatuporn Wittayakun5,e, Pamela Pasetto2,f*
1Division of Polymer Engineering and Rubber Industrial Technology, Department of Mechanical Engineering Technology, College of Industrial Technology, King Mongkut’s University of Technology North Bangkok, Bangkok 10800, Thailand.
2Institut des Molecules et Materiaux du Mans, UMR CNRS 6283, Le Mans Universite, 72085 Le Mans Cedex 9, France.
3Nuclear Technology Research and Development Center, Thailand Institute of Nuclear Technology (Public Organization), Nakhon Nayok 26120, Thailand
4National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand.
5School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
The summarized precoess of MSN@CTNR preparation. 2.3 Characterization The chemical structure and functional groups of the synthesized materials was characterized by Fourier Transform Infrared (FTIR) spectroscopy using a Nicolet Avatar 370 DTGS FTIR spectrometer.
Results and Discussion 3.1 Chemical structure of CTNR FTIR spectra revealing characteristic peaks corresponding to different molecular vibrations of MSN, MSN@APTES, and MSN@CTNR samples and a possible model are presented in Fig. 1.
The TEM image of MSN revealed well-defined mesoporous structures with a uniform size distribution with an average diameter of 450 nm.
TEM images showcased the morphological changes, highlighting the effective dispersion of CTNR within the MSN structure.
The summarized precoess of MSN@CTNR preparation. 2.3 Characterization The chemical structure and functional groups of the synthesized materials was characterized by Fourier Transform Infrared (FTIR) spectroscopy using a Nicolet Avatar 370 DTGS FTIR spectrometer.
Results and Discussion 3.1 Chemical structure of CTNR FTIR spectra revealing characteristic peaks corresponding to different molecular vibrations of MSN, MSN@APTES, and MSN@CTNR samples and a possible model are presented in Fig. 1.
The TEM image of MSN revealed well-defined mesoporous structures with a uniform size distribution with an average diameter of 450 nm.
TEM images showcased the morphological changes, highlighting the effective dispersion of CTNR within the MSN structure.
Online since: June 2013
Authors: Anatoly Klenushkin, Boris Medvedev, Yuri Kabirov, Mikhail Evdokimov
LiMn2O4with spinel structure is also applied, although it has low specific capacity (about 120 mAh/g).
Recently there has been interest in the use of lithium iron phosphate with an ordered olivine structure.
According to XRD data they were single-phase with reverse spinel structure CuFe2O4and ZnFe2O4.
Song et al., New Iron (III) Phosphate Phases: Crystal Structure and Electrochemical and Magnetic Properties, J.
Inorganic Chemistry. 41 (2002).2778-2786
Recently there has been interest in the use of lithium iron phosphate with an ordered olivine structure.
According to XRD data they were single-phase with reverse spinel structure CuFe2O4and ZnFe2O4.
Song et al., New Iron (III) Phosphate Phases: Crystal Structure and Electrochemical and Magnetic Properties, J.
Inorganic Chemistry. 41 (2002).2778-2786
Online since: November 2015
Authors: Jin Man Kim, Joung Soo Sun
Lightweight impact sound is hugely affected by the flexibility of the surface material and is easy to control while heavy impact sound is greatly affected by the structure itself such as rigidity and density of the structure, as well as the thickness and fastening condition of the slab.
To reduce the heavy impact sound, the mass of the slab can be increased to cause hardening of the floor vibration or the rigidity of the structure can be increased to enhance the effective mass of the shocking point; however, for ordinary concrete, although the reduction of the heavy impact sound is possible by increasing the thickness or the mass of the slab, it would result in the degeneration of construction and cost efficiency[1,2,3].
Lee, A Study on the Characteristics of the Floor Impact Noise and Vibration According to Structure Types of Apartment House, Journal of the Korea institute of Building construction, Vol9.No.2 99. 35-39. (2009) [6] D.
Moore, Physical Chemistry, Prentice Hall, Englewood Cliffs, NJ, 22. (1972) [10] A.
To reduce the heavy impact sound, the mass of the slab can be increased to cause hardening of the floor vibration or the rigidity of the structure can be increased to enhance the effective mass of the shocking point; however, for ordinary concrete, although the reduction of the heavy impact sound is possible by increasing the thickness or the mass of the slab, it would result in the degeneration of construction and cost efficiency[1,2,3].
Lee, A Study on the Characteristics of the Floor Impact Noise and Vibration According to Structure Types of Apartment House, Journal of the Korea institute of Building construction, Vol9.No.2 99. 35-39. (2009) [6] D.
Moore, Physical Chemistry, Prentice Hall, Englewood Cliffs, NJ, 22. (1972) [10] A.
Online since: August 2019
Authors: Pavlo V. Kryvenko, Tamara Kopylova, Sergii G. Guzii, Olga P. Bondarenko
One of perspective directions of how to improve strength of the glued connections is to apply physical fields which lead to re-arrangement of the structure of polymer base of a glue.
Acknowledgements The authors would like to acknowledge a financial support of the Ministry of Education and Science of Ukraine for the fundamental research project “Physico-chemical bases for regulation of structure formation process and properties of the mineral aluminosilicate binder as adhesive for the use in ecologically friendly wood products intended for various application” (Reg.
Modern Bamboo Structures: Proceedings of the First International Conference.
Journal of Applied Chemistry.
Increase of fire resistance of coated wood with adding mineral fillers. in: Proc. 7th International Scientific Conference “Reliability and Durability of Railway Transport Engineering Structures and Buildings” (Transbud-2018), Volume 230.
Acknowledgements The authors would like to acknowledge a financial support of the Ministry of Education and Science of Ukraine for the fundamental research project “Physico-chemical bases for regulation of structure formation process and properties of the mineral aluminosilicate binder as adhesive for the use in ecologically friendly wood products intended for various application” (Reg.
Modern Bamboo Structures: Proceedings of the First International Conference.
Journal of Applied Chemistry.
Increase of fire resistance of coated wood with adding mineral fillers. in: Proc. 7th International Scientific Conference “Reliability and Durability of Railway Transport Engineering Structures and Buildings” (Transbud-2018), Volume 230.
Online since: January 2010
Authors: Surachai Artkla, Won Yong Choi, Jatuporn Wittayakun
Comparison of TiO2/RH-MCM-41 and TiO2/TEOS-MCM-41 Hybrid
Catalysts in Characteristics and Photodegradation of
Tetramethylammonium
Surachai Artkla
1,2,3
*, Wonyong Choi3 , Jatuporn Wittayakun
1
1
School of Chemistry, Suranaree University of Technology, Nakhon Ratchasima, 30000, Thailand
2
Faculty of Art and Science, Roi-et Rajabhat University, Selaphoom, Roi-et, 45120, Thailand
3
School of Environmental Science and Engineering, Pohang University of Science and
Technology, Pohang, 790-784, South Korea
*E-mail: surachaiartkla@yahoo.com, Tel: +664-3556-001
Keywords: Photodegradation, TiO2, MCM-41, Tetramethylammonium, Hybrid Catalysts
Abstract.
TEM images A) Hexagonal structure of RH-MCM-41 (100k), B) Hexagonal structure of RH-MCM-41 (100k), C) and D) TiO2 particles on RH-MCM-41 and TEOS-MCM-41 (25k).
The TiO2 and MCM-41s might cooperate in photogeneration of hydroxyl radical, stabilized catalyst structures and removed electron-hole recombination.
Nevertheless, PCD on hybrid catalysts was almost negligible at this condition because structure of MCM-41 was not stable in the alkaline condition [16, 17].
TEM images A) Hexagonal structure of RH-MCM-41 (100k), B) Hexagonal structure of RH-MCM-41 (100k), C) and D) TiO2 particles on RH-MCM-41 and TEOS-MCM-41 (25k).
The TiO2 and MCM-41s might cooperate in photogeneration of hydroxyl radical, stabilized catalyst structures and removed electron-hole recombination.
Nevertheless, PCD on hybrid catalysts was almost negligible at this condition because structure of MCM-41 was not stable in the alkaline condition [16, 17].
Online since: April 2003
Authors: Y. Wakamatsu, Katsuo Syoji, Ji Wang Yan, Hiroki Nakamura
Observations using a scanning electron
microscope show that the polishing disc has a high-density and homogeneous structure and the
bonding strength is low.
Characteristics of the GPD Test piece Next, the hardness and the microscopic structure of the GPD manufactured using fine abrasive of SiO2, Al2O3 and Cr2O3 have been examined.
Similar uniform structure is observed for the 1µm SiO2 and the 5µm Cr2O3 too.
Observation using scanning electron microscope shows that the polishing disc has high-density, homogeneous structure and low-bonding strength.
Nakano: Attraction of the gel form learned from the salmon roe, Journal of the Japan Society for Chemistry and Education, Vol.48 (2000) p.36.
Characteristics of the GPD Test piece Next, the hardness and the microscopic structure of the GPD manufactured using fine abrasive of SiO2, Al2O3 and Cr2O3 have been examined.
Similar uniform structure is observed for the 1µm SiO2 and the 5µm Cr2O3 too.
Observation using scanning electron microscope shows that the polishing disc has high-density, homogeneous structure and low-bonding strength.
Nakano: Attraction of the gel form learned from the salmon roe, Journal of the Japan Society for Chemistry and Education, Vol.48 (2000) p.36.
Online since: April 2016
Authors: Xiao Wen Xu, Jing Yang
Preparation of SnO2-TiO2/zeolite Y composites with enhanced photocatalytic activity
Jing Yanga, Xiao-wen Xub
School of Chemistry and Bioengineering, Jiangsu Key Laboratory for Environment Functional Materials, University of Science and Technology of Suzhou, Suzhou 215009, P.R.China
ajy@mail.usts.edu.cn, bxwxu@mail.usts.edu.cn
Keywords: nanostructures; SnO2; TiO2
Abstract.
Three diffraction peaks were observed at ca.26°, 34°and 38° (Fig. 1A), which were indexed to crystalline structure of russellite SnO2, corresponding to the indices of (1 1 0), (1 0 1) and (2 0 0) planes, also implying the SnO2 nanoparticles have formed on the zeolite Y.
The HRTEM image in Fig. 2D shows the lattice spacing is 0.35nm, which correspond to the indices of (1 0 1) plane of crystalline structure of anatase.
Fig. 4 The patterns of photocatalytic degradation of MO in aqueous solution under UV- light irradiation (SnO2/zeolite Y(C), TiO2/zeolite Y(B) and SnO2-TiO2/zeolite Y(A)) Fig. 5 Schematic diagram shows the energy band structure and electron-hole pair separation in the TiO2-SnO2 heterostructure.
Sun, Electrospun TiO2/SnO2 nanofibers with innovative structure and chemical properties for highly efficient photocatalytic H2 generation, Int.
Three diffraction peaks were observed at ca.26°, 34°and 38° (Fig. 1A), which were indexed to crystalline structure of russellite SnO2, corresponding to the indices of (1 1 0), (1 0 1) and (2 0 0) planes, also implying the SnO2 nanoparticles have formed on the zeolite Y.
The HRTEM image in Fig. 2D shows the lattice spacing is 0.35nm, which correspond to the indices of (1 0 1) plane of crystalline structure of anatase.
Fig. 4 The patterns of photocatalytic degradation of MO in aqueous solution under UV- light irradiation (SnO2/zeolite Y(C), TiO2/zeolite Y(B) and SnO2-TiO2/zeolite Y(A)) Fig. 5 Schematic diagram shows the energy band structure and electron-hole pair separation in the TiO2-SnO2 heterostructure.
Sun, Electrospun TiO2/SnO2 nanofibers with innovative structure and chemical properties for highly efficient photocatalytic H2 generation, Int.
Online since: October 2006
Authors: Bernd Clauss, Dirk Schawaller
Modern Aspects of Ceramic Fiber Development
Bernd Clauss1,a , Dirk Schawaller2,b
1,2Institut for Textile Chemistry and Chemical Fibers, ITCF Denkendorf
Körschtalstr. 26, 73770 Denkendorf, Germany
abernd.clauss@itcf-denkendorf.de, bdirk.schawaller@itcf-denkendorf.de
Keywords: Ceramic Fibers, Oxide Fibers, Non-oxide Fibers, Spinning, CMC
Introduction
Ceramic fibers are high performance fibers for advanced technical applications, mainly in
areas where high thermal and chemical resistance are requested.
"glassy") structure and the production process can also contain a melt processing step.
Well known filament fiber compositions are: SiC, Si-C-O, Si-C-N, Si-C-N-O and Si-B-C-N (although these fibers can contain some amount of oxygen, no typical oxides are formed in the structure, and this does therefore not contradict the term "non-oxide).
Usually the fibers do not fail by decomposition, but rather by structure changes, creep or slow oxidation processes.
Research activities and perspective Due to the limitations of the presently available ceramic fibers, current developments aim at the reduction of high temperature creep for oxide fibers by optimizing the ceramic structure and at improvement of the oxidation stability of non-oxide fibers by developing other material compositions.
"glassy") structure and the production process can also contain a melt processing step.
Well known filament fiber compositions are: SiC, Si-C-O, Si-C-N, Si-C-N-O and Si-B-C-N (although these fibers can contain some amount of oxygen, no typical oxides are formed in the structure, and this does therefore not contradict the term "non-oxide).
Usually the fibers do not fail by decomposition, but rather by structure changes, creep or slow oxidation processes.
Research activities and perspective Due to the limitations of the presently available ceramic fibers, current developments aim at the reduction of high temperature creep for oxide fibers by optimizing the ceramic structure and at improvement of the oxidation stability of non-oxide fibers by developing other material compositions.
Online since: August 2017
Authors: M. Balasubramaniam, S. Balakumar
The obtained material was then subjected to annealing at 700 °C for 4 h at ambient atmosphere in a box furnace and cooled to room temperature; the structure and phase formation of ZnSb2O6 nanoparticles were confirmed through X-ray Diffraction (XRD - Bruker D8 advance, Cu-Kα1 radiation).
Results and Discussion Structural analysis Fig. 1 XRD pattern of ZnSb2O6 nanoparticles Crystal structure and phase formation were confirmed through XRD analysis, as depicted in Fig. 1.
The pattern confirmed the formation of single phase tetragonal crystal structured [15, 22] nanostructures of zinc antimonate and the Bragg’s reflections obtained were indexed to standard JCPDS card no. 38-0453.
Conclusion Through simple precipitation route, zinc antimonate nanoparticles were synthesized successfully and its corresponding phase formation and crystal structure were studied through XRD analysis.
Acknowledgements The authors acknowledge DST-INSPIRE for providing the fund to do our research work and Prof.M.V.Sangaranayanan and M.V.Beena, Department of chemistry, IIT Madras for providing electrochemical measurement facility.
Results and Discussion Structural analysis Fig. 1 XRD pattern of ZnSb2O6 nanoparticles Crystal structure and phase formation were confirmed through XRD analysis, as depicted in Fig. 1.
The pattern confirmed the formation of single phase tetragonal crystal structured [15, 22] nanostructures of zinc antimonate and the Bragg’s reflections obtained were indexed to standard JCPDS card no. 38-0453.
Conclusion Through simple precipitation route, zinc antimonate nanoparticles were synthesized successfully and its corresponding phase formation and crystal structure were studied through XRD analysis.
Acknowledgements The authors acknowledge DST-INSPIRE for providing the fund to do our research work and Prof.M.V.Sangaranayanan and M.V.Beena, Department of chemistry, IIT Madras for providing electrochemical measurement facility.
Online since: March 2019
Authors: Tri Joko Raharjo, Murdiah Murdiah, Deni Pranowo
Synthesis of Zingerone Using NiCl2•6H2O-NaBH4 as a Selective Hydrogenation Reaction Agent
MURDIAHa, DENI Pranowob* and TRI Joko Raharjoc
Department of Chemistry, Faculty of Mathematics and Natural Science,
University of Gadjah Mada, Indonesia
amurdiah@mail.ugm.ac.id, bmaspranowo@ugm.ac.id, ctrijr_mipa@ugm.ac.id
Keywords: Synthesis, zingerone, selective hydrogenation
Abstract.
Introduction Zingerone has a very interesting structure for being studied and developed.
The structure of dehydrozingerone was identified by FT-IR and GC-MS.
Selective hydrogenation reaction of dehydrozingerone The structure of zingerone was identified by FT-IR and GC-MS.
Structure of zingerone Table 1.
Introduction Zingerone has a very interesting structure for being studied and developed.
The structure of dehydrozingerone was identified by FT-IR and GC-MS.
Selective hydrogenation reaction of dehydrozingerone The structure of zingerone was identified by FT-IR and GC-MS.
Structure of zingerone Table 1.