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Online since: July 2013
Authors: Thomas Sabu, Chandran Nithin, Runcy Wilson
Intercalated structure
When the polymer chains diffuse between the silicate layers without distorting the layered structure, but widen the interlayer distance (basal spacing), with the retention of the crystal order an intercalated structure is formed.
1.3.3.
Exfoliated structure Complete distortion of the clay crystal morphology gives the exfoliated structure.
This reinforcement structure explains the improvement in stiffness and strength.
G Theng, The chemistry of clay–organic reactions John Wiley & Sons Inc.New York, 1974 [4] W.
[9] Mini—Encyclopedia of Papermaking, Wet-End Chemistry, Home Page: www.4.ncsu.edu, accessed July 16, 2007
Exfoliated structure Complete distortion of the clay crystal morphology gives the exfoliated structure.
This reinforcement structure explains the improvement in stiffness and strength.
G Theng, The chemistry of clay–organic reactions John Wiley & Sons Inc.New York, 1974 [4] W.
[9] Mini—Encyclopedia of Papermaking, Wet-End Chemistry, Home Page: www.4.ncsu.edu, accessed July 16, 2007
Online since: April 2015
Authors: Svetlana Svitasheva
Thus, ellipsometry is used as method of wide applicability in several fields, such as physics, and chemistry, and biology, and medicine.
Ellipsometry takes special place, because it can else give information about zone structure of substance.
Long oxidation led to simpler model of structure of samples.
Svitasheva, Modeling Methods of Optical Inhomogeneous Structures.
Aita, Correlation between titania film structure and near ultraviolet optical absorption, J.
Ellipsometry takes special place, because it can else give information about zone structure of substance.
Long oxidation led to simpler model of structure of samples.
Svitasheva, Modeling Methods of Optical Inhomogeneous Structures.
Aita, Correlation between titania film structure and near ultraviolet optical absorption, J.
Online since: February 2013
Authors: Ji Wen Fang, Jian Dong Cai, Long Sheng Nian, Lu Fan Zhang, Xue Li Li, Wei Jun Luo
And an optimal structure of block for right temperature was built.
Structure optimization of heating block.
The structure expanding analysis should be studied in the heating course.
And an optimal structure of block for right temperature was built when x=9mm and y=1mm.
Williams, T.S.McLaren, Y.C.Lee: Materials Chemistry and Physics.
Structure optimization of heating block.
The structure expanding analysis should be studied in the heating course.
And an optimal structure of block for right temperature was built when x=9mm and y=1mm.
Williams, T.S.McLaren, Y.C.Lee: Materials Chemistry and Physics.
Online since: March 2008
Authors: Mika Jokinen, Sami Areva, Mika Koskinen
The dual nature of the structure, the molecular structure of silica, i.e., low
degree of condensation and its obvious relation to the great amount of silanol groups and (2) the
pore structure was studied [14-17].
The pore structure is difficult to measure directly due to high water amounts, but indirect measurements (dried structures) gave specific surface areas of several hundreds of m2/g.
The former describes the formation of an irreversible structure which forms a new entity that is separate from the rest of system and the latter a reversible structure or more loosely aggregated structure that can be re-dispersed by agitation, e.g., by mixing.
Scherer: Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing (Academic Press, Inc. 1990)
Iler: The Chemistry of Silica: Solubility, Polymerization, Colloid and Surface Properties, and Biochemistry (John Wiley & Sons, Inc. 1979)
The pore structure is difficult to measure directly due to high water amounts, but indirect measurements (dried structures) gave specific surface areas of several hundreds of m2/g.
The former describes the formation of an irreversible structure which forms a new entity that is separate from the rest of system and the latter a reversible structure or more loosely aggregated structure that can be re-dispersed by agitation, e.g., by mixing.
Scherer: Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing (Academic Press, Inc. 1990)
Iler: The Chemistry of Silica: Solubility, Polymerization, Colloid and Surface Properties, and Biochemistry (John Wiley & Sons, Inc. 1979)
Online since: April 2020
Authors: Worawut Muangrat, Thanawee Chodjarusawad, Akapong Suwattanamala, Chaisak Issro
X-Ray diffraction (XRD) was employed to analyze the crystalline structure of ZnO-coated on rGO.
Fig. 1(a-b) images show the wrinkle-liked structure of rGO.
The lamella structure of wrinkled rGO nanosheets is due to the van der Waals interaction [10, 11].
The G-band indicates the signal reflection a graphitic structure that is emitted from the stretching vibration of the sp2 carbon while the D-band corresponds to a disordered carbon structure and the sp3 hybridized carbon [12-13].
The results showed that the rGO maintained their structure after coating with ZnO.
Fig. 1(a-b) images show the wrinkle-liked structure of rGO.
The lamella structure of wrinkled rGO nanosheets is due to the van der Waals interaction [10, 11].
The G-band indicates the signal reflection a graphitic structure that is emitted from the stretching vibration of the sp2 carbon while the D-band corresponds to a disordered carbon structure and the sp3 hybridized carbon [12-13].
The results showed that the rGO maintained their structure after coating with ZnO.
Online since: January 2024
Authors: Haniffudin Nurdiansah, Diah Susanti, Adzon Nugraha Rizky Pratama
Graphene is a crystalline form of carbon with a diamond-like crystal structure [3].
The XRD pattern displayed similarities to that of graphite; however, it exhibited an amorphous structure characterized by low intensities and broadened peaks.
The XRD peaks of CuCr2O4, marked with diamond symbols, indicate a tetragonal structure (JCPDS No 88-0110) [9].
As the lattice spacing expanded further at higher temperatures, more dopants could penetrate the material structure.
The authors also acknowledge the facilities, scientific and technical support from Materials Chemistry Laboratory, Corrosion, and Material Failure Laboratory, and Materials Characterization Division, Department of Materials and Metallurgical Engineering – ITS.
The XRD pattern displayed similarities to that of graphite; however, it exhibited an amorphous structure characterized by low intensities and broadened peaks.
The XRD peaks of CuCr2O4, marked with diamond symbols, indicate a tetragonal structure (JCPDS No 88-0110) [9].
As the lattice spacing expanded further at higher temperatures, more dopants could penetrate the material structure.
The authors also acknowledge the facilities, scientific and technical support from Materials Chemistry Laboratory, Corrosion, and Material Failure Laboratory, and Materials Characterization Division, Department of Materials and Metallurgical Engineering – ITS.
Online since: April 2020
Authors: Sutasinee Kityakarn, Sukit Boonlha, Pongkarn Chakthranont
The SEM image of the LCO-Lys/Cit exhibits better connected particles and a well-defined pore structure compared to those prepared by Lys or 40%Me/EG metal precursor solutions.
The morphology of the structures was observed by a tungsten hair pin scanning electron microscopy (SEM) equipped with EDS.
Further increasing the calcination temperature to 450 °C, the ordered porous structure became apparent and the PMMA was completely removed.
The LCO precursor particles exhibit in a honeycomb-like arrangement or three dimensionally ordered macroporous structure (3DOM).
The effects of the size of the polymer microsphere and the substitution of the A site or B site in perovskite structure on the formation of porous structure will be further investigated in future studies.
The morphology of the structures was observed by a tungsten hair pin scanning electron microscopy (SEM) equipped with EDS.
Further increasing the calcination temperature to 450 °C, the ordered porous structure became apparent and the PMMA was completely removed.
The LCO precursor particles exhibit in a honeycomb-like arrangement or three dimensionally ordered macroporous structure (3DOM).
The effects of the size of the polymer microsphere and the substitution of the A site or B site in perovskite structure on the formation of porous structure will be further investigated in future studies.
Online since: June 2017
Authors: Zu Ming Hu, Jun Rong Yu, Jing Zhu, Yan Wang, Kai Ju Luo
The chemical structure of polyamides was investigated by 1H NMR and FT-IR.
The excellent structure of furan ring can not only maintain the outstanding properties of PPTA but also improve its solubility.
The structure of obtained copolymers was detected by 1H NMR spectra and the result of PPTA-co-PPF-30 was shown in Fig. 1 as an example for the case of briefness.
Together with the result of 1H-NMR, the chemical structure of copolymers were confirmed.
Gabilondo, Diels–Alder “click” chemistry for the cross-linking of furfuryl-gelatin-polyetheramine hydrogels, RSC Adv., 4 (2014) 35578-35587.
The excellent structure of furan ring can not only maintain the outstanding properties of PPTA but also improve its solubility.
The structure of obtained copolymers was detected by 1H NMR spectra and the result of PPTA-co-PPF-30 was shown in Fig. 1 as an example for the case of briefness.
Together with the result of 1H-NMR, the chemical structure of copolymers were confirmed.
Gabilondo, Diels–Alder “click” chemistry for the cross-linking of furfuryl-gelatin-polyetheramine hydrogels, RSC Adv., 4 (2014) 35578-35587.
Online since: November 2010
Authors: Guang Lei Zhang, Hua Fu, Shi Min Liu, Jing Wen, Guo Qiang Qin
Results and Discussion
Stannic oxide possesses a rutile structure in the P42/mnm (No.136) space group with the unit cell of SnO2 characterized by the two lattice constants a, c and the internal parameter u.
The doping of Ta causes relative changed in electronic structure, as revealed in Fig.1b.
Meanwhile, optical measurements can be used directly to characterize the electronic band structure since transitions between occupied and unoccupied states are caused by the electric field of the photon,hence optical spectrum is of high sensitivity on the changes in electronic structure.
This phenomenon coincides with the SM transition in elerctronic structure.
Lide: CRC Handbook of Chemistry and Physics (CRC Press, Boca Raton 2005) [18] H.
The doping of Ta causes relative changed in electronic structure, as revealed in Fig.1b.
Meanwhile, optical measurements can be used directly to characterize the electronic band structure since transitions between occupied and unoccupied states are caused by the electric field of the photon,hence optical spectrum is of high sensitivity on the changes in electronic structure.
This phenomenon coincides with the SM transition in elerctronic structure.
Lide: CRC Handbook of Chemistry and Physics (CRC Press, Boca Raton 2005) [18] H.
Online since: February 2011
Authors: Wen Ying Zhou, Jiang Tao Cai, An Ning Zhou
Thermal Properties of the Aluminum Particle Reinforced
Silicone Rubber Composites
Wenying Zhou1,2,a, Jiangtao Cai1,b and Anning Zhou1,c
1School of Chemistry and Chemical Engineering, Xi'an University of Science & Technology, Xi'an, 710054, People' Republic of China
2State Key Laboratory of Electrical Insulation & Power Equipments, Xi'an Jiaotong University, Xi'an, 710049, People' Republic of China
awyzhou2004@163.com, bcaijiangtaotao@yahoo.com.cn, czhouanning2004@yahoo.com.cn
Keywords: Silicone Rubber; Aluminum; Thermal Property; Microstructure
Abstract: Micro-sized aluminum (Al) reinforced silicone rubber composites were prepared, and the thermal properties of the composites were investigated in term of composition, shape, and surface modification of Al particles.
Thus, the inclusion of Al in silicone rubber results in heterogeneous network structure, and leads to structural imperfection of vulcanized rubber.
The Al particles at low content can disperse randomly in the silicone rubber and has weak interaction each other to present a slow increase of thermal conductivity because the Al particles encapsulated by rubber matrix cannot touch one another resulting in a high interfacial thermal contact resistance at the phase interface; whereas, at high filler loading, the thermal conductivity strongly increases since the filler particles begin to touch one another and form particle clusters or a more compact packing structure within the matrix due to the reduced interfacial thermal contact resistance [9-10].
The micro-structures of fractured surface of the silicone rubber unfilled and filled with 70 wt% of spherical Al particles and 40 wt% of flaky Al particles are shown in Fig.5.
Thus, the inclusion of Al in silicone rubber results in heterogeneous network structure, and leads to structural imperfection of vulcanized rubber.
The Al particles at low content can disperse randomly in the silicone rubber and has weak interaction each other to present a slow increase of thermal conductivity because the Al particles encapsulated by rubber matrix cannot touch one another resulting in a high interfacial thermal contact resistance at the phase interface; whereas, at high filler loading, the thermal conductivity strongly increases since the filler particles begin to touch one another and form particle clusters or a more compact packing structure within the matrix due to the reduced interfacial thermal contact resistance [9-10].
The micro-structures of fractured surface of the silicone rubber unfilled and filled with 70 wt% of spherical Al particles and 40 wt% of flaky Al particles are shown in Fig.5.