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Online since: May 2004
Authors: J. Szépvölgyi, Z. Károly
Károly Research Laboratory of Materials and Environmental Chemistry, Chemical Research Center, Hungarian Academy of Sciences H-1025 Budapest, Pusztaszeri út 59-67.
It was concluded that the structure and particle size of products was mainly determined by the porous nature of starting materials.
From the above formulas it can be calculated that the amount of gas in the voids are in the same order of magnitude than that of gas in the porous structure of starting grains.
This is attributed to the fact that the solidified phase structure is basically determined by the relative critical free enthalpies of nucleation of alternative crystal structures.
The microstructure of the product can principally be influenced by the structure of raw materials and to a less extent by the plasma operating conditions.
Online since: April 2012
Authors: P. Preecha Yupapin, M. Tasakorn, N. Suwanpayak
The internal structure of bones, blood vessels are in the Haversian system of compact bone that consists of Haversian and Volkmann's canal.
It depends upon the NA (numerical aperture), laser wavelength, light polarization state, laser mode structure, relative index of refraction, and geometry of the particle.
Blood Circulation network manipulation Microfluidics is a burgeoning field with important applications in areas such as medical devices, biotechnology, chemical synthesis and analytical chemistry.
Schematic structure of artificial bone for orthopedic surgery.
Schematic diagram of (a) blood waveguide, (b) blood waveguide structure.
Online since: February 2008
Authors: Xiu Li Chen, Hui Qing Fan, Yun Fei Fu, Pei Feng Zhang
Researches showed that BST materials with super fine grains and high densities had a good dielectric properties and perfect physical chemistry properties.
The morphology was observed by a scanning electron microscope (SEM) and the crystal structure was analyzed using X-ray diffraction (XRD).
Phase structure.
The crystal structure is pure perovskite phase.
As can be seen, the BST40 ceramics sintered at 1200°C can achieve compact structure.
Online since: November 2011
Authors: Xu Ying Li, Fei Yang, Jing Liu, Juan Tan
This nanotubular structure feature was rarely observed among mesostructured inorganic/surfactant composite materials [8].
Results and Discussion Structure of mesoporous NiPO-3.
The high epoxidation selectivity of NiPO-3 might be derive from the long nanotube units presented in the structure, as well as the high BET surface area and pore volume.
Conclusions The mesoporous nickel phosphate NiPO-3 with long hollow nanotubes in structure has been synthesized by using a cationic surfactant as template and urea as alkali.
XRD and TEM study illustrates that NiPO-3 exhibits similar structure feature with NiPO-1 and NiPO-2 in a less-ordered lamellar symmetry.
Online since: July 2012
Authors: Jin He Jiang
Property of LiMn0.5Ti0.75O3 Type Ion-exchangers and Extraction for Lithium Jinhe Jiang MicroScale Science Institute , Department of Chemistry and Chemical Engineering ,Weifang University, Weifang, 261061,China Corresponding author.
In this paper, inorganic ion exchanger (LiMn0.5Ti0.75O3) with a spinel structure ion memory was synthesized, which is different the reported in the literatures[3-4], and its ion-exchange properties were studied.
The structure of compound metal oxide LiMn0.5Ti0.75O3 crystallized at 800℃ was much perfect.
As shown, the structure of LiMnTi-800(H) is nearly constant, which is inverse spinel oxide type too.
LiMn2O4 doped elements on the structure and properties [J].
Online since: December 2012
Authors: Li Liu, Li Yuan Zhao, Ze Xin Tian
Development of New Enerfy-Saving Apparatus on Domestic Gas-Cooker Li Liu, Liyuan Zhao, Zexin Tian School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550003, China E-mail: haccp09@163.com Keywords: gas-cooker, micropore, heat reflection, energy-saving apparatus Abstract.
The energy structure adjustment from coal to petroleum and clean gaseous fuel has already been completed in a great many countries of the world.
Study on the structure of energy-saving apparatus The structure of energy-saving device is one of the main factors influencing the efficiency of heat utilization and the combustion of gaseous fuels.
So according to the structure of the present totally-enclosed gas-cookers, we designed a energy-saving apparatus with a special structure added to the gas-cookers.
Online since: May 2014
Authors: Titipun Thongtem, Anukorn Phuruangrat, Budsabong Kuntalue, Phattharanit Dumrongrojthanath, Somchai Thongtem, Nuengruethai Ekthammathat
Bismuth molybdate as an Aurivillius phase catalyst represented by (Bi2O2)2+(An-1BnO3n+1)2- is composed of unique layered structures with (An-1BnO3n+1)2- perovskite slabs inserted between (Bi2O2)2+ layers [5, 6].
The TEM images revealed that undoped Bi2MoO6 and 3 % Ho doped Bi2MoO6 samples were composed of square nanoplates structures with edge lengths of 50-100 nm and 400-600 nm, respectively.
Both can be indexed as the (060), (062) and (002) planes with electron beam in the [100] direction of orthorhombic Bi2MoO6 structure of single-crystalline nanoplate.
Liu, Effects of the solvent on the structure, morphology and photocatalytic properties of Bi2MoO6 in the solvothermal process, Mater.
Zhu, Controllable synthesis of Bi2MoO6 and effect of morphology and variation in local structure on photocatalytic activities, Appl.
Online since: February 2014
Authors: Vladimir S. Rudnev, I.V. Lukiyanchuk, M.V. Adigamova, A.Yu. Ustinov, P.V. Kharitonskii, A.M. Frolov, I.A. Tkachenko, V.P. Morozova
Morozova1,h 1 Institute of Chemistry of Far Eastern Branch of Russian Academy of Sciences, 159, Prosp. 100-letya Vladivostoka, Vladivostok, 690022, Russia 2Far Eastern Federal University, 8, Sukhanova str., 690950, Vladivostok, Russian Federation arudnevvs@ich.dvo.ru, blukiyanchuk@mail.ru, cadigamova@ich.dvo.ru, dustin@ifit.phys.dvgu.ru, epeterkh@phys.dvgu.ru, ffroloff5@yandex.ru, gtkachenko@ich.dvo.ru, hmorozova@ich.dvo.ru Key words: Plasma Electrolytic Oxidation, Ferromagnetic Oxide Coatings, Aluminum, Titanium.
The surfaces of coatings have complex heterogeneous structures (Fig. 3).
There are structure elements typical for the layers formed by PEO method, i.e., pores surrounded with swells (black in the images), volcano-shaped protuberances around pores, structured valleys, dispersed particles (microgranules), cracks where the dispersed particles are concentrated, etc.
As follows from the data of Fig. 4 iron is definitely concentrated in pores and structured valleys pierced with a large number of small pores.
As follows from the data of Table 1, the compositions of individual surface structures noticeably differ.
Online since: April 2009
Authors: Xiao Zhi, Gao Yang Zhao, Yang Ren, Tao Zhu
Introduction With the worsening in energy crisis in recent years, the people have attached increasing importance to the energy-saving problem of the glasses used in architectural structures.
The metal coating [1-3] is usually used in Low-emissivity (Low-E) glass which is used as the energy-saving material in the architecture structures, whereas the metal coating exposed to the atmosphere is vulnerable to be oxidized or become mildewed, leading to a decrease in glass transmittance and conductivity so that the Low-E glass of metal coating must be usually prepared into multi-coating structure [2-4],whereby leading to an increase in costs by a wide margin.
Accordingly, if the oxide thin films are produced on a large area and in succession, the cost will be further reduced so that it can be expected that the oxide thin films will be used as the Low-E glass coating to be used in modern architectural structures on a large scale.
These diffraction peaks are entirely corresponding to multi-crystals of tin oxide with rutile structure, whereby indicating that the thin films has only a tin oxide phase, with the better crystallinity and doping completely dissolved into tin oxide.
Scalvi and P.N.Lisboa-Filho etal: Journal of Physics and Chemistry of Solids Vol.67 (2006), p.1410-1415
Online since: June 2010
Authors: Fang Ju Zhang, Yi Xia Yan, Xi Cheng Huang, Wen Jun Hu, Jun Mei, Yong Mei Chen
Introduction Vanadium-base alloy, as a typical low active material, is regarded as the candidate material for the wall structure of fusion reactor.
Fig. 5a shows the metallurgical structures of specimen at positions with different strains under quasi static tension.
For the quasi static tension the initial structure where transversal strain equals to zero is of equiaxed grain with 200 µm of uniform size.
This shows that the metallurgical structure of V-5Cr-5Ti does not obviously change under tension at strain rates form 10-5/s to 1200/s.
This is becauce of Ti having a stronger chemistry affinity than V, Cr with impurity O and N[7,8].