Search results

Abstract: This research was incorporated the hydroxyapatite in a mineral trioxide aggregate sealer, with the aim of studying this influence in the structure, morphology and radiopacity of the cement to obtain osteoconductive material.
Inside the universe of materials, which is included the MTA, a material that has been gaining attention in various different applications, it is medicine, engineering, chemistry, biochemistry and envisions a new variety of specific applications are ceramics known as calcium phosphate.

This involves typical sp3 hybridization bonds, which form a tetrahedral structure.
Presence of micro-structured smooth surfaces can be clearly observed with plateaus in it.
We infer for the formation of the micro-structured thin nanosheets.
We also observe micron size nano-rod like structures in lower resolution Fig. 6d.
This also confirms for the polycrystalline wurtzite structure.

In the primary walls, the fibrils have a reticulated structure.
Cellulose has six forms of crystalline structure: cellulose I, cellulose II, cellulose III, cellulose III1, cellulose III2, cellulose IV1 and cellulose IV2, but among the six crystal structures cellulose I is the most researched, because this crystal structure is the form presented in the fibers in nature [37].
The properties of the polymers are quite different, depending on external variables and their structure.
Fengel, Wood – Chemistry, Ultrastructure, Reactions, Walter De Gruyter ,New York, 1989
Applications of Lignocellulosic Fibers to Polymers Chemistry and Composites.

The network structure of hydrogels can be macroporous, microporous or nonporous.
Although some of the gels are rigid enough to maintain their structure under a small stress, after exceeding the yield-value, gel fluidity is observed with loss of polymer structure.
FTIR is a useful technique for identifying the chemical structure of a substance.
Stephenson, Eds; Royal Society of Chemistry: London, (1996)
Bowman, Structure and swelling of poly (acrylic acid) hydrogels: effect of pH, ionic strength, and dilution on the cross-linked polymer structure, Polym. 45 (2004) 1503–1510

Their chemical structures and molecular weights are given in Table 1.
Table 1 Chemical structure of dispersants Dispersants Chemical structure Molecular weight SDS 288 NNO 472 PVP 40000 Two dispersing methods were adopted for CB dispersions.
Park, W.S.Kim and D.W.Lee: Analytical and Bioanalytical Chemistry Vol. 375 (2003), p. 489 [17] S.D.

The structure of this layer is initially amorphous [9-11].
Alumina, Al2O3,  has many metastable structures, the so-called “transition aluminas”, whose densities are different.
Above this transition point, the structure was reported to change into disordered γ-Al2O3 [10, 12].
Lee: Journal of Physical Chemistry C, Vol. 116 (2012), p. 404

Jr.1,2,c 1Institute of Chemistry, College of Science, University of the Philippines, Diliman, Quezon City, Philippines 2Natural Sciences Research Institute, College of Science, University of the Philippines, Diliman, Quezon City, Philippines aljptrinidad@gmail.com, bkenaldrenusman@yahoo.com, clmpayawan@yahoo.com Keywords:TiO2, TiO2/poly (acrylic acid) nanocomposite, Gamma irradiation, Atomic Force Microscopy; Layer-by-Layer Assembly, Scanning Electron Microscopy Abstract.
Closer examination show highly adsorbed spherical structures of sizes ranging from about 40-120 nm depending on the ratio of solution as seen in Figure 1.b.
PAA, upon irradiation should collapse from a linear configuration to a globular structure.
The latter tends to create a structure with more loops and tails, providing stronger steric repulsion.

Effect of Al on Microstructures and Properties of Ti-45Al-8.5Nb-0.2B-0.2W Alloy Xiangjun Xu 1,2,a, Junpin Lin1,b, Dongdong Han1,c 1 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, PR China 2 Materials and Chemistry School, Zhongyuan University of Technology, Zhengzhou 450007，China adrxxj@126.com, blinjunpin@ustb.edu.cn, chd707914083@163.com Keywords: High Nb containing TiAl alloy; , Al content; , Composition; , Mechanical property.
High magnification photos reveal that the nets show two morphologies: one is Ti and Nb enriched α2// γ lamellar structure, the other is β (B2) phase.
The matrix with grey contrast is α2// γ lamellar structure.
The increase in Al content induces the decease in α2 phase, which, in turn, results in the decrease in lamellar spacing of the lamellar structure and a high strength.

The similarity of crystal structure and morphology of thaumasite and ettriginte make it hard to deduce the deterioration causes of sulfate attack.
The single thaumasite, ettringite, and other phase’s crystal structure were used as starting models in the refinement procedure.
Due to the similarities in crystal structure and morphology, common X-ray diffraction is difficult to distinguish thaumasite and ettringite.
Hu, Application of 29Si Nuclear Magnetic Resonance (NMR) in Research of Cement Chemistry, J Mater Sci Eng. 25 (2007) 147-153

Changes and disruptions of irradiated device characteristics depend on type of radiation, rate of energy deposition in semiconductor device, and the type of material the semiconductor structure is made of.
With the formation of vacancy due to the displacement of atoms, there must exist the displaced atoms that are not bounded by lattice structure, furthermore, the atoms will be moved into a non-lattice position, these atoms are named interstitial atoms.
Nordlund: High-energy collision cascades in tungsten: Dislocation loops structure and clustering scaling laws, EPL (Europhysics Letters), 103(4), 46003 (2013)
Biersack: The Stopping and range of ions in matter, Treatise on Heavy-Ion Science: Volume 6: Astrophysics, Chemistry, and Condensed Matter, 95 (2012)