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Online since: October 2011
Authors: Qun Jie Xu, Hong Yun, Chang-Jian Lin
China 2State Key Laboratory for Physical Chemistry of Solid Surface, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian Province, P.
These features demonstrate that the calcined TiO2 film presents a less compact structure.
It inversely agrees with the preceding results that the TiO2 film hydrothermally treated at 1700C possesses a more compact structure and provides a better corrosion protection to metals.
With increasing hydrothermal temperature, the crystallization in anatase phase is enhanced and the surface structure of the TiO2 film becomes heterogeneous and rough.
The TiO2 film hydrothermally treated at 1700C for 4h possesses a more compact and smoother structure, which provides a much higher corrosion resistance than that by conventional calcination at 450°C for 2h.
Online since: July 2011
Authors: Kyeong Il Kim, Mie Won Jung, Tae Whan Hong, Jung Il Lee, Young Geun Lee, Whan Gi Kim, Sung Woong Yoo
Fabrications and Evaluations of Hydrogen Capacities on MgHx-Transition Metal Oxide(TMO) Composites by Mechanical Alloying Jung-Il Lee1, a, Kyeong-Il Kim1,b, Sung-Woong Yoo1,c, Young-Geun Lee1,d, Whan-Gi Kim2,e, Miewon Jung3,f and Tae-Whan Hong1,g 1Department of Material Science Engineering/Research Center of Sustainable Eco-Devices and Materials(ReSEM), Chungju National University, 50 Daehak-ro, Chungju, Chungbuk, 380-702, Republic Korea 2Department of Applied Chemistry, KonKuK University, 322 Danwol-dong, Chungju-si, Chungbuk, 380-701, Republic Korea 3School of Biological Sciences and Chemistry, Sungshin Wonmen’s University, Seoul, 136-742, Republic Korea ajilee@cjnu.ac.kr, bkki@cjnu.ac.kr, cysw8204@cjnu.ac.kr, dyoglee@cjnu.ac.kr, ewgkim@kku.ac.kr, fmwjung@sungshin.ac.kr, gtwhong@cjnu.ac.kr Keywords: Hydrogen storage, Transition metal oxide(TMO), Kinetics, MgHx-TMO composites, Mechanical alloying Abstract.
X-ray diffraction (XRD) patterns of MgHx-TMO composites are composed low intensity and broading peaks that assumed like amorphous/nano-structured materials.
High surface area and nano-structured materials should have a positive effect on the hydrogen diffusion faster and faster, so hydrogenation/dehydrogenation properties increasing [9].
Therefore, we were fabricated nano-structured composites using the hydrogen induced mechanical alloying.
And amorphous/nano-structured materials have high surface, positive effects such as distances of hydrogen diffusion have a short.
Online since: April 2014
Authors: Hendrik O. Lintang, Salasiah Endud, Mohamad Azani Jalani, Leny Yuliati
Introduction Nowadays, AuNPs play an important role in chemistry and material sciences due to their promising properties in optical, electronic, magnetic, catalytic, and biomedical applications [1,2].
Fig. 1 showed the formation of gold(I) pyrazolate complex ([Au3Pz3]C10TEG) for the sol-gel process to form mesostructured gold nanocomposites ([Au3Pz3]C10TEG/silicahex) with a hexagonal pore structure.
b) Fig. 2a showed a small angle area of XRD patterns with diffraction peaks at 2θ = 2.16o (d100), 3.70° (d110), and 4.30° (d200) due to the characteristics of mesoporous silica with a hexagonal structure [6,12,13].
Interestingly, new diffraction peak at 2θ = 2.90° (d100) was observed for preservation of hexagonal structure of the mesoporous with an interpore distance of 3.0 nm even after calcination.
From the TEM images in Fig. 2b, the structure of mesoporous silica having uniform hexagonal arrangement were clearly observed, thus supported the XRD data of the as-fabricated silica film of the gold nanocomposites having interpore distance of 4.0 to 5.0 nm.
Online since: August 2020
Authors: Harison Rozak, Wan Nurfadhilah Zaharim, Saidah Sakinah Mohd Tajudin, Siti Nuramira Abu Bakar, Nur Eliana Ismail, Sulaiman Shukri, Isao Watanabe
Initial muoniated cytosine nucleobase structure.
The converged molecular orbitals were then used to examine the electronic structures of the systems.
The structure presented well define geometry for the ground states.
All basis sets that include polarization function produced structures with lower total energy.
Walker, Muon and Muonium Chemistry, Cambridge University Press, 1983
Online since: June 2012
Authors: Jin Sun, Zhen Zhong Gao, Rui Hang Lin, Xiao Bo Wang, Xiao Feng Zhu
Sodium silicates are of considerable importance for many fields of inorganic chemistry and applied mineralogy, being either raw materials for synthesis or already finished products.
The structural chemistry of crystalline sodium silicates offers the crystallographer challenging tasks such as polytypism, polymorphism, temperature and/or pressure-dependent phase transitions, pseudo-symmetry, complex twinning phenomena as well as incommensurately modulated structures.[12] However, up to now, the modification additive of sodium silicate to PF resin has not been reported yet.
The structure of modified PF resin was characterized by FTIR.
As show in Figure 4, many white solid granules appear, but they are variform, cubic crystal structure and echelonment structure.
The structure of Na2SiO3-PF resin after curing is divided into two phases, and the two-phase structure is not segregated, but combined together tightly.
Online since: August 2011
Authors: Qin Xian, Jiao Rong Fan, Wang Zhe
Primitively, the structure of the cover, we thought, should be planar electrodes, and in bottom, it presented an array of point electrodes, as shown in figure1.
further discussions of the device The structure also possess a advantage that not only the holes perforated expose the point electrode by utilizing SU-8, but it can serve as the holes to get cells stuck, as shown in figure5.
It is indeed an effective structure.
Analytical Chemistry, 2007, 79(20):7761 –7766
Online since: September 2013
Authors: Salmie Suhana Che Abdullah, Imaduddin Helmi Wan Nordin, N.S. Hazwani, N.A. Shafiqa
This study has focused on the effect of sintering time on the density and crystal structure of LaYO3 doped ZrO2.
For samples to obtain single phase with orthorhombic structure, XRD pattern should match JCPDS data (No. 09-0032).
Effect of Divalent Dopants on Crystal Structure and Electrical Properties of LaAlO3 Perovskite.
Journal of Physics and Chemistry of Solids, pp. 540–546
Concise Encyclopedia Chemistry, Walter de Gruyter & CO, Berlin, pp. 585.
Online since: July 2015
Authors: Meng Zhang, Dong Hao Sun, Ying Wang
As a result, the products as-synthesized in these acid media showed either micro/nanospheres or irregular structures.
The UV–Vis spectra and FTIR spectra indicated that the main chain structures of both POC nanofibers and microspheres were identical.
Guo, A novel templateless method to nanofibers of polyaniline derivatives with size control, Journal of Polymer Science: Part A: Polymer Chemistry 46 (2008) 740-746
Sahin, The Substituent Effects on the Structure and Surface Morphology of Polyaniline, Journal ofAppliedPolymer Science, 115 (2010) 3024–3030
Quillard, FTIR spectroscopic investigations of polyaniline derivatives–palladium systems, Journal of Molecular Structure 596 (2001) 89-99.
Online since: January 2012
Authors: Jin Sheng Liang, Yan Ding, Dong Mei Zhang, Xi Mu, Lei Wang
The research on the structure and function of water has never halted.
These changes of physical parameters of water are due to its structure.
He: Journal of Molecular Structure, p. 15 [10] D.M.
Yang: Inorganic Chemistry (Higher Education Press, China 2002) [16] P.
Yang: Science China Chemistry, Vol. 36(2006), p. 284
Online since: October 2015
Authors: Igor Štubňa, Anton Trník, Ján Ondruška, Tomáš Húlan, Daniel Antal
Illite changes its composition and structure when it is heated.
In this temperature range there is also a change of metaillite (illite after dehydroxylation) into a disordered structure and the creation of new phases.
Thermal treatment of illite samples in the dehydroxylation region (500 – 800 °C) changes the structure of illite irreversibly, which at room temperature results also in changes of dimensions.
Hanic, Influence of technological texture on electrical properties of industrial ceramics, Physics and Chemistry of Solids, 68 (2007) 1135-1139
McCarty, The nature of structure-bonded H2O in illite and leucophyllite from dehydratation and dehydroxylation experiments, Clay and Clay Minerals, 55 (2007) 45-58