Search results

Effect of mineralizers on MnNb2O6 powder prepared by hydrothermal method Yongping Pu 1,a, Yongyong Zhuang 2,b, Kai Chen 3,c, Ning Xu 4,d 1 School of Materials Science & Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China; Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Xi’an, 710021, China 2 School of Materials Science & Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China; Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry, Ministry of Education, Xi’an, 710021, China 3 School of Materials Science & Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China; 4 School of Materials Science & Engineering, Shaanxi University of Science and Technology, Xi’an 710021, China; a puyongping@sust.edu.cn, b xiaozhuang235@163.com, c chenkai0608@yeah.net, d xu-ning-skd@163.com Key words: hydrothermal; MnNb2O6 powders Abstract: Pure MnNb2O6 powders
In multilayer structures, the dielectrics with low sintering temperatures were needed to co-fire with low loss conductors and low melting point electrodes such as silver and copper [2,3].
As show in Fig. 1, the samples exhibited no distinct diffraction peaks agreed with that of MnNb2O6 crystal structure with HCl or HF as mineralizers.
By comparison, the peaks corresponding to MnNb2O6 crystal structure under neutrality conditions and with NH3·H2O, NaOH as mineralizers.

The present investigation, focuses on the improvement of TiO2 photocatalytic properties by incorporation of carbon nanotube in its structure under the visible light irradiation.For comparison, nano-tube TiO2 was prepared by thermal treatment on MWCNT-TiO2 nanocomposite to remove carbonacious material and its ability to degrade gaseous phase acetaldehyde was examined.
Results and Discussion FE-SEM analysis The morphological structure of the samples has been shown in Fig.1.
According to FE-SEM images and comparison of the bare MWCNTs with produced samples, formation of desired structures is observed.
Windle , Morphology control of CNT-TiO2 hybrid materials and rutile nanotubes, Journal of Materials Chemistry 18(17): 2036-2043
Progress in solid state chemistry 32(1): 33-177 [3] Rajeshwar K (1995) J Appl Electrochem 25:1067 [4] B.

The synthesis of biocompatible hydrogel based on poly(ethylene glycol) (PEG) and ethylene diamine (EDA) using epoxy-amine chemistry was conducted.
Fig. 1: Structure of monomer, (a) poly(ethylene glycol) diglycidyl ether (PEGDGE) and cross-linker, (b) ethylene diamine (EDA) used in this study.
Eq. 1 Results & Discussion Structure prediction.
Swelling results confirmed that by reducing the average EDA functionality in the system, the structure of the hydrogel becomes less cross-linked, more flexible and more swellable [15].
Theoretically, hydrogels synthesized using a mol ratio of 1.0 should not form gels due to their supposed linear structure.

Recently, there is an interest on willemite (Zn2SiO4) structures providing promising host lattices to reduce the amount of Co used to obtain blue pigments.
In the present study, the blue pigments based on willemite structure having low percentage of Co were obtained by using ZnO produced from industrial metal slags, SiO2 and CoO.
The colour properties, appearance of glazes and crystal structure of the pigments obtained from different ZnO powders were very similar, although ZnO powders produced from industrial metal slags contain some impurities such as PbO, CuO etc as shown in Table 1.
Acknowledgements We would like to thank Ekmekcioğulları Metal and Chemistry A.Ş., (Çorum-Turkey) for supplying ZnO powders produced from metal slag wastes.
Monros: Green Chemistry Vol. 2, 3 (2000), p.93 [3] S.

Results and discussion Microstructure (a) 300× (b) 2000× (c) 5000× Fig.1 The morphology graph of SJDM–1 compact coating Fig. 1 shows that the micro-arc oxide ceramic coating of the rare earth magnesium alloys are composed of MgO, ZnO, Zr3O, Mg14(SiO4)5O4 and Mg2SiO4 (spinel) crystals and amorphous phase.Moreover from the organizational structure observed, the ceramic particles of the SJDM-1 RE-Mg alloys micro-oxidation surface ceramic layer are more evenly distributed, the diameter of the discharge hole is smaller, and there are the scene that film material around the hole after melting solidification.
Moreover from the organizational structure observed, the ceramic particles of the SJDM-1 RE-Mg alloys micro-oxidation surface ceramic layer are more evenly distributed, the diameter of the discharge hole is smaller, and there are the scene that film material around the hole after melting solidification.
D., BulychevSI,Composition and structure of toughended surface layer on aluminium alloy obtained by microarc oxidation [J].Physics chemistry magazine, (4):92-97,1988 [5] Malyschev V，Mikrolichtbogen Oxidation[J]，Metalloberfl che， 49(8)：606-608，1995 [6] GORDIENKO P.S, Gnedenko S., Khrisanfova OA, Koryakova ga, es, Sinebrukhov S.L, Skorobogatova tm, New detection of coatings on graded titanium formed by microarc oxidation in electrolytes mode[J], Physics chemistry magazine,(3):77-83,1995 [7] Malyshev В.Н, Sorokin GA.M, New discovery in the micro-arc oxidation pulse power [J], Frontier invention , 17(5):653-656,1996 [8] Timoshenko A．V．Opara B．K，Magurova Yu．V，Formation of Protective Wearresistent Oxide Coatings on Aluminium Alloys by the Microplasma Methods from Aqueous Electrolyte Solutions[C]，12th Proc．Inter．Corros．Congr，Nace：Houston，1：280-293，1993 [9] Yerokhin A L ，Nie X ，Leyland A ，et al，Plasma elect rolysis for surface engineering [J]，Surface and Coatings Technology ，122 ：73-79，1999

Ismail3, f 1Materials Technology Programme, School of Physics and Materials Science, Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia 2Applied Chemistry Programme, School of Chemistry and Environment, Faculty of Applied Sciences, Universiti Teknologi MARA, 40450 Shah Alam, Selangor, Malaysia 3Mechanical and Manufacturing Department, Faculty of Engineering, Universiti Putra Malaysia, 43400 Serdang, Selangor, Malaysia aqudratulqurnia@yahoo.com, brosma614@salam.uitm.edu.my, ctalari@gmail.com, dsabrinamyahaya80@gmail.com, eshamsuddin@upm.edu.my, fms_idris@upm.edu.my Keywords: Aluminium-silicon (Al-Si) alloys, mechanical properties, microstructure, titanium diboride, grain refinement.
The as-cast alloy shows poor mechanical properties because of its coarse cast structure.
This needle-like structure acts as crack initiators thus lowering the mechanical properties of Al-Si alloy.
Globular structure can be seen clearly on the microstructure of Al-Si-TiB2.

The powders were obtained to study the crystal structure.
The crystal structure of SrFeO3-δ powders and thin films was analyzed by XRD (Rigaku, model D/max-2500 system at 40Kv and 100mA of CuKα).
Fig.3 shows the crystal structure of strontium fer- rite powder at different temperature.
It can be explained by defect chemistry.
The defect chemistry is given: 1/2O2 + V •o ⇔ O ×o+ h (7) The mass-action expression for Eq.7 is p/ [V •o]P1/2O2=K ' Oxexp(−ΔH ' Ox/KT) (8) This gives: LogR ∝ -1/2logPO2 (9) combination of Eqs.(6) and (9) yields the slope is between -1/4 and -1/2.

Muhibul Alam 1, a 1 Radiation and Polymer Chemistry Laboratory, Institute of Nuclear Science and Technology, Bangladesh Atomic Energy Commission, GPO Box: 3787, Dhaka-1000, Bangladesh. 2 Department of Chemical Engineering and Polymer Science, Shahjalal University of Science and Technology, Sylhet, Bangladesh.
Bentonite is a type of clay mainly composed of montmorillonite that is a 2:1 type aluminosilicate has a crystalline structure with an octahedral layer of aluminum hydroxide between two tetrahedral layers of silica.
This may be due to the intercalation of the clay particle into the SA bonding structure.
The peak displacements for the nanocomposite can be considered as an evidence of crystalline structure changes in these materials.
Olphen, An Introduction to Clay Colloid Chemistry (2nd ed., Krieger Publishing Company, Malabar, Florida, 1991)

Sensitive Material The organic film that made from a polymer and the organic substance such as Poly (methyl methacrylate) and 18-crown-6 as a sensitive material has structure which is shown in Fig. 1(a).
Structure of 18-crown-6 ether and 2, 4, 6-trinitrotolurene (TNT) The solution of 18-crown-6 ether is prepared for 2x10-3 M and coated by dipping the QCM into the solution.
The structure of TNT is shown in Fig.1 (b). 2.
Pichit Sudta for guidance on the chemistry theory and thank to Assoc.
Prené, “Detection of explosives vapors using a multi-quartz crystal microbalance system,” Procedia Chemistry Volume 5, 2010, pp. 472-475

Experiment The centrifugal platform used in this study is a sandwich-like structure with two polycarbonate discs on both sides and a double-sided pressure-sensitive adhesive layer in between.
The fluidic structures were made by patterning the pressure-sensitive adhesive layer with a cutting plotter (CAMM-1 CX24, Roland).
The fluidic structure is very simple to fabricate and no surface modification is required.
Analytical Chemistry, 2005. 77(5): p. 1216-1221. 4.
Analytical Chemistry, 2005. 77(3): p. 933-937. 7.