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Online since: October 2007
Authors: Knut Marthinsen, Trond Furu, Tanja Pettersen, Yan Jun Li
Particle structure (dispersoids and primary particles), grain structure and level of elements in solid solution govern the mechanical and annealing properties of the material.
Introduction Upon annealing after deformation, recovery and recrystallization reactions will occur depending on the as-deformed dislocation structure and the particle structure.
The homogenisation treatment prior to deformation can be actively used to make a particle structure that will produce the desired annealing structure.
During homogenisation the primary particles will transform to stable phases and grow, Mn will migrate from solid solution to particles, dispersoids will nucleate and grow or dissolve depending on their size, exposed temperature-time cycle and alloy chemistry [e.g. 7, 8].
Figs. 2a) to 2d) show the particle structure during holding at 500 o C.
Online since: November 2010
Authors: Wen Wang, Ke You Yang, Li Mei Huang, Mei Juan Lin
The luminescence property study of CdTe/PMMA emitting green light under visible light Wen Wanga, Limei Huang, Meijuan Lin and keyou Yang College of Chemistry and Material Science, Fujian Key Laboratory of Polymer Materials, Fujian Normal University, Fuzhou 350007, China apolywangwen@yahoo.com.cn Keywords: CdTe quantum dot; luminescence property; PMMA.
The structure and optical properties of CdTe/PMMA were investigated by Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), Uv-vis absorption spectrum, and fluorescence spectrum, respectively.
Online since: May 2011
Authors: Yu Shen, Xu Xu Zheng, Hai Dong Zhang
Dodecane solubilized in the hydrophobic cores of P123 micelles leads to large pore size and the unique bundle structure of the silica nanotubes.
Yang, P, Sheng, In Physics and Chemistry of Nanostructured Materials, Taylor and Francis, London 2000
Online since: October 2013
Authors: Qiao Juan Gong, Hong Sun, Tao Wu, Yong Qiang He, Chen Zhong Yao, Jian Ping Gao
Fabrication of Calcium Sulfate/Tri-calcium Phosphate Composite Bone Fillers through Molding Method Hong SUN1,a, Tao WU2,b, Yong-qiang HE1,2,c, Qiao-juan GONG1,d, Chen-zhong YAO1,e and Jian-ping GAO2,f 1Department of Applied Chemistry, Yuncheng University, Yuncheng 044000, China 2School of Science, Tianjin University, Tianjin 300072, China ahongsun2013@163.com, bwiny5t@126.com, cheyongqiang@126.com, dqiaojuangong@163.com, echenzhongyao2010@126.com, fjianpinggao2012@126.com Keywords: Tri-calcium phosphate, Hydroxyapatie, Bone filler, Resorption, Composite.
Their structure and properties were characterized by infrared spectroscope, scanning electronic spectroscope, x-ray diffraction and degradation test.
Online since: December 2012
Authors: Autumn Yeh, Chin Cheng Chien, Michael Chan, Chan Lon Yang, Jun Yuan Wu, Kai Ping Wang, Zhi Jian Wang, Ted Guo, Samantha S.H. Tan, Alex Kabansky, Tehtien Su, Jack Kao
., 4650 Cushing Parkway, Fremont, CA 94538, USA akai_ping_wang@umc.com bSamantha.Tan@lamrc.com Keywords: high-K/metal gate, wet clean, BARC, photoresist, polymer defects, surface analysis Abstract Chemical and physical modifications of photoresist and BARC during plasma patterning process on HKMG structure can cause residual defects and yield loss that challenges the subsequent wet cleaning process to resolve this issue.
It was found that the plasma chemistries react with the surface of the BARC and PR material to create a SiOX shell.
Online since: July 2006
Authors: M. Ilavsky, Z. Sedlakova, V. Velychko, J. Nedbal, H. Valentova
Such two-phase structure usually improves their mechanical and ultimate properties.
The effect of diisocyanate structure -HexMDI, HMDI and TDI was investigated for two diols - D2 and D4.
For D1/TDI polymer only amorphous structure with Tg~58o C and ∆cp~0.45 J/gK was observed.
At critical conversion of the reaction (the gel point GP), first infinite structure is formed [16].
Flory: Principles of Polymer Chemistry (Cornell University Press, Ithaca, N.Y. 1953)
Online since: July 2022
Authors: Bo Zhao, Rui Lei Zong, Qing Jiang Wang, Qing Feng Yin, Dong Jin
China 2Institute of Chemistry, China Special Equipment Inspection and Research Institute, Beijing, P.R.
The short thermal process has insufficient driving force for the growth of single-phase austenitic structure.
Metallographic structures test.
Metallographic structures were obtained in line with Method A listed in GB/T4334.1-2008.
Results Analysis Metallographic structure test.The metallographic structure of simulated weld microstructure of austenitic stainless steel in each HAZ area is shown in Figure 1.
Online since: October 2015
Authors: Mihai Chisamera, Florin Ştefănescu, Gigel Neagu, Hazim Faleh, Muna Noori
Silicon carbide is composed by tetrahedral planes of carbon and silicon atoms, with bonds with relatively high binding energy, in crystal lattice of cubic β-SiC or hexagonal α-SiC structures.
At 750°C the amorphous layer is transformed into a crystalline structure type γAl2O3.
Over these values it can discuss just about an effect of magnesium concerning the primary structure of material.
Richardson, Physical Chemistry of melts in metallurgy, Academic Press, London, 1974
Ravikumar, The effects of magnesium additions on the structure and properties of Al-7 Si-10 SiCp composites, J.
Online since: May 2021
Authors: Teguh Ariyanto, Rochmadi Rochmadi, Muhammad Iqbal Al Fuady, Imam Prasetyo
Scanning Electron Microscope (SEM, JSM 6510 LA, JEOL) was used to analyze the morphological structure of porous carbon.
Fig. 1a and b, respectively, feature morphological structures of carbon synthesized from palm kernel shell (C-PKS).
It can be seen that C-PKS is rather coarse and rigid structures (Fig. 1a).
Based on Table 1, C-PKS-Ox features a combination of micro- and mesopore structures.
Lopez Ramon, “Changes in surface chemistry of activated carbons by wet oxidation,” vol. 38, no. 2000, pp. 1995–2001, 2001
Online since: November 2012
Authors: Catarina Martins, Rui F. Duarte, Maria C.F. Magalhães, Dmitry Evtuguin
The FTIR spectra also confirm the presence of cyclic silica (SiO)6 structures as revealed from characteristic band at 1220 cm–1.
The 29Si spectra show mainly Q3 structures but other structures were present in the silica network, such as Q2 and Q4 corresponding to –101, –91 and –111 ppm signals, respectively [7].
In Q3 structures the silicon atoms are linked to 3 oxygen atoms and to one silicon atom, and the oxygen atoms make bridges between silica atoms.
The silica network is constituted by cyclic units (Q3) linked by hydrogen bridges to Q4 structures.
Evtuguin, Hydration of cellulose/silica hybrids assessed by sorption isotherms, Journal of Physical Chemistry B. 114 (2010) 4047-4055