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Calcium phosphates biocements are biomaterials that present crystallographic and mineralogical characteristics similar to human skeletal structure.
Dorozhkin: International Journal of Materials and Chemistry Vol. 1(1) (2011), p 1
Champion and Bernache-Assollante: Chemistry and Physics Vol. 80 (2003), p. 269.

Therefore, it is essential to control the corrosion to save considerable expenses in materials, equipment, and structure.
They were believed to be the typical reflection planes of the cellulose I structure.
[10] May, C., Epoxy resins: chemistry and technology, Routledge 201
Cellulose nanocrystals: chemistry, selfassembly, and applications.
Materials Chemistry and Physics 92, pages 112-117.

A random structure of 40nm-thick flakes, grown perpendicularly on the substrate, has been obtained.
In this paper, we present the synthesis and characterization of porous-structured ZnO films by chemical bath deposition.
Crystal structure analysis of calcined samples at 300°C reveals a transformation from a zinc carbonate hydroxide (Zn5(CO3)2(OH)6) to a zinc oxide (ZnO) structure; referred to as PDF No 00-36-1451.
A macropore structure was formed by cavities among the nanoflakes lying randomly on the substrate.
Calcination at 300°C successfully converted the Zn5(CO3)2(OH)6 to a ZnO structure.

Titration is a quantitative analysis used in chemistry to determine unknown concentration of a known substance [2].
HRP is a heme-containing enzyme used in H2O2 biosensors as a biocatalyst due to its known structure, stability and bioactivity [38].
Nafion® is a negatively charged film of polyionic perfluorosulfonate ionomer with a microscopic network structure capable of passing nanoparticles [44].
Yuan, "Direct electrocatalytic reduction of hydrogen peroxide based on Nafion and copper oxide nanoparticles modified Pt electrode," Journal of Electroanalytical Chemistry, vol. 612, pp. 157-163, 2008
Sornambikai, "selective amperometric sensing of hydrogen peroxide with nafion/copper particulates chemically modified electrode," Indian Journal of chemistry, vol. 48A, pp. 940-945, 2009

Kamau5,e and Emmanuel Iwuoha6,f 1,2,3,5 Chemistry Department, University of Nairobi, P.O Box 30197-00100, Nairobi, Kenya 4,6 Chemistry Department, The University of Western Cape, Private Bag, X17, Bellville, South Africa adavkat05@gmail.com, b*imichira@uonbi.ac.ke,cpeterson.guto@uonbi.ac.ke dpbaker@uwc.ac.za, egnkamau@uonbi.ac.ke feiwuoha@uwc.ac.za Keywords: Iron nanoparticles, Green Synthesis, Brymothymol Blue, catalytic degradation, environmental remediation Abstract.
Introduction The application of nanoscale materials and structure, usually ranging from 1-100 nanometers (nm) is an emerging area of nanoscience and nanotechnology.
Green tea extract was prepared by heating 10 g of green tea (Tusky’s supermarket, Kenya) in 100 mL distilled deionised water (DDW, from analytical Laboratory, chemistry department, university of Nairobi).
The XRD characterization was carried out in order to determine the crystal structure of iron solids synthesized.
Mallouk, Surface chemistry and electrochemistry of supported zerovalent iron nanoparticles in the remediation of aqueous metal contaminants.

Their structures and properties were characterized by Fourier transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), Differential scanning calorimetry (DSC) and the surface resistance meter.
Introduction Ionic liquids (ILs) have been receiving a great deal of attention in the development of new “green” technologies, because they have potential nonvolatility, nonflammability, low melting point, and high thermal stability, and hence create a cleaner and more sustainable chemistry [1].
The high thermal stability was attributed to the presence of skeleton structure of imidazole.
The skeletal structure of imidazole provided ionic conductance in the polymerized membrane.

Properties of Concrete with Lower Amount of SCM VEJMELKOVÁ Eva1,2a *, KOŇÁKOVÁ Dana1,b and ROVNANÍKOVÁ Pavla3,c 1Czech Technical University in Prague, Faculty of Civil Engineering, Department of Materials Engineering and Chemistry, Thákurova 7, 166 29 Prague 6, Czech Republic 2Czech Technical University in Prague, University Centre for Energy Efficient Buildings, Třinecká 1024, 273 43 Buštěhrad 3Brno University of Technology, Czech Republic, Faculty of Civil Engineering, Institute of Technology of Building Materials and Components, Veveří 331/95, 60 200, Brno, Czech Republic aeva.vejmelkova@fsv.cvut.cz, bdana.konakova@fsv.cvut.cz, crovnanikova.p@fce.vutbr.cz Keywords: High strength concrete, waste material, basic physical and thermal properties.
Basic physical properties, pore structure, hygric properties and frost resistance concrete containing supplementary cementing materials.
Pore structure.
Characterization of pore structure was performed by mercury intrusion porosimetry.

Photocatalytic Water Splitting and Photocatalytic Degradation in Aqueous GdVO4 Suspensions under Simulated Solar Irradiation Yan Bai1, a*, Ya-ming Ding2, b and Zhi-min Li2, c 1College of Geography and Environment Science, Northwest Normal University, Lanzhou 730070, China 2College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, China a baiyan226@163.com, b dingym1225@163.com,cleezmin@nwnu.edu.cn Keywords: Photocatalytic, Hydrogen, Vanadate, Degradation, Simulated solar irradiation Abstract.
XRD analysis of GdVO4 showed its structure was of tetragonal type.
As shown in Fig.1, The crystal structure of the GdVO4 is the tetragonal structure, which belongs to I41/amd (141) space group.

Phase and structure analysis of CuCr2-xGdxSe4 (x=0.1÷0.3) synthesized using a solid state reaction method were carried out using X-ray powder diffraction.
Two compounds CuCr1.95Gd0.05Se4 and CuCr1.9Gd0.1Se4,. were chosen for a detailed structure refinement.
In this paper, using X-ray powder diffraction we analyse the phase purity and the structure of CuCr2Se4 doped with gadolinium.
The structures with closest matching lattice parameters were found to be similar to cubic GdSe (Fm-3m) but with smaller lattice parameter a=5.62.
For x£0.2 the main content crystallized in cubic, normal spinel structure

Introduction Metallic honeyycomb is named by their linear cellular structure.
Some of these applications include transportation, aerospace, environment protect, new power, mechanical chemistry, electronics and construction.
The honeycomb structures before and after sintering are shown in Fig.1, sintering temperature 1200℃, time 30min.
The structure of sintered honeycombs consists of matrix phase α-Fe(Cr,Ni) , complex compounds of silicon and oxygen.
Lee, Metal Honeycomb from Oxide paste：Maraging Steel and Super Invar structure and properties, In: Processing and Properties of Lightweight Cellular Metals and Structures, edited by A.Ghosh,T.Sanders,D.Claar, TMS，2002, p.116 [9] A.