Search results

The α-phase, which has an hcp structure, is enriched with hcp stabilizing elements such as Al, N, oxygen.
With a bcc structure, the β-phase is enriched with beta-stabilizing elements such as V, Nb, Mo, Ta.
Because of the difference in chemistries of these phases, the formation of the nanotube oxide layer is not uniform in the Ti alloys having dual phase microstructure as one phase could get etched preferentially by the electrolyte [16].
The TiO2-WO3 nanotube structure show great ion insertion and electrochemical properties by small amounts of WO3 in the TNT structure.
Conclusions In summary, the TiO2 nanotube arrays made by anodic oxidation has very attractive applications due to the particularly properties of TiO2 nanotube structure such as high surface area, controllable nanotube dimensions, geometries and surface chemistry.

Especially porous materials attract attention due to their supportive structure for cell and tissue growth/development.
This leads to the fact that 1300AH10 and 1300AH30 powders have a porous structure which is evident in Fig. 3.
The formation of these gaps was referred to the decomposition of an amount of BHA thus removal of an amount of OH- from the HA structure.
These structures remained after the heat treatment and caused the particle growth in the composite powders.
Sommerdijk, Sol-Gel Materials Chemistry and Applications (Advanced Chemistry Texts), CRC Press, Boca Raton, 2001

Sonochemical synthesis of nitrogen doped TiO2 at a low temperature Xi-Kui Wang1,a, Chen Wang1,b, Wei-Lin Guo2,c, 1 School of Light Chemistry and Environmental Engineering, Shandong Polytechnic University, Jinan 250353, China 2 School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, China aemail: xk_wang@spu.edu.cn; bemail: shanqing123@126.com; cemail: chm_guowl@ujn.edu.cn Keywords: Nitrogen doped TiO2; photocatalyst; preparation; Sonochemistry Abstract.
The crystalline forms and crystallite sizes of the as-prepared sample is characterized by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy and UV-Visible absorption spectrum.The product structure was dependent upon the reaction temperature and reaction time.
Under such extreme conditions, Various novel chemical reactions and physical changes occurred, and numerous nano-structured materials such as metals, alloys, oxides and biomaterials had been synthesized by using high-intensive ultrasound[15,16].
The XRD spectra of the sample obtained at 70˚C displays seven peaks (Fig. 1d), and the pattern clearly shows the nanoparticles have an anatase structure with all major peaks matching the atandard pattern of bulk TiO2 (JCPDS 21-1272).

Mechanical and Thermal Properties of Ternary System Based on Starch-Grafted-Polyethylene/High Density Polyethylene/Halloysite Nanocomposites Walid Fermas1,2,a*, Mustapha Kaci1,b, Remo Merijs Meri2,c, Janis Zicans2,d 1Laboratoire des Matériaux Polymères Avancés (LMPA), Université de Bejaia 06000, Algeria 2Institute of Polymer Materials, Faculty of Material Science and Applied Chemistry, Riga Technical University, Paula Valdena 3, Riga, LV-1048, Latvia awalid.fermas@yahoo.fr, bkacimu@yahoo.fr, cremo.meri@gmail.com, djanis.zicans@rtu.lv Keywords: halloysite, nanocomposites, starch, HDPE, starch-grafted-polyethylene, mechanical properties.
In this paper, the effect of content of unmodified halloysite nanotubes (HNTs) on chemical structure and thermal and the mechanical properties of blends based on starch-grafted-polyethylene (SgP) and high density polyethylene (HDPE) (70/30 w/w) nanocomposites was investigated at various filler content ratios (1.5 wt%, 3 wt% and 5 wt%).
The objective of this paper was to evaluate the effect of unmodified halloysite nanotubes (HNTs) on the chemical structure and thermal and mechanical properties of SgP/HDPE (70/30 w/w) nanocomposites at various filler ratios (1.5 wt%, 3 wt% and 5  wt%.
Conclusions The effect of unmodified HNTs on chemical structure and on thermal and mechanical properties of SgP/HDPE nanocomposites was evaluated at various loading rates up to 5 wt%.
The authors thank the BATTUTA program for financial support in the framework of the European Program Erasmus Mundus, and the hosting Institute of Polymer Materials, Faculty of Material Science and Applied Chemistry, Riga Technical University, Latvia.

The detailed structure and property analyses with X-ray, UV-spectroscopy, electron microscopy and so on will be discussed in relation to the synthetic conditions Introduction There has been an increased interest in the composite of intrinsically conductive polymers(ICPs) with inorganic materials to improve various properties.
Because of the stiffness of backbone due to PANI's chain structure and strong intermolecular interactions, melt processing is not possible due to their decomposition at temperature below softening or melting point [5].
Electrical conductivity, crystalline structure and thermal stability of PANI/TiO2 composites synthesized at different compositions were characterized Materials and fabrication method Materials Reagent-grade aniline (ANI), ammonium persulfate (APS), sodium dodecyl sulphate (SDS), chloroform and hydrochloric acid were purchased from Wako chemical Co.
Vol.128 (2002) p.167 [2] Polymer Degradation and Stability Vol. 91 (2006) p. 2213 [3] Materials Chemistry and Physics Vol. 103 (2007) p. 450 [4] Materials Chemistry and Physics Vol. 102 (2007) p. 249 [5] J.Y.

Clays belong to the family of phyllosilicates, which means they present layered structures.
The structure of kaolinite clay consists of a stacking of 1:1 layers.
Van Olphen: Introduction to clay colloid chemistry (Wiley and Sons 2nd eds., New York 1977)
Frost: Journal of Physical Chemistry (1999) [15] B.X.
Wang: Journal of Solid State Chemistry Vol. 179, N° 3 (2006), p. 949 [16] A.

OP-10 as dispersant has such a good dispersing effect due to its molecular structure (C8H17C6H4O (CH2CH2O)10H as shown in Fig. 4).
Bridging effect refers to the link and caterpillar track structure of dispersant in solution link easily the two particles together, thus causing flocculation[17].
Ezhilvalavan, T.Tseng, Progress in the developments of (Ba,Sr)TiO3 (BST) thin films for Gigabit era DRAMs, Material Chemistry Physics,2000.65:227–248
[2] J.Wang, T.Zhang, R.Pan, J.Jiang, Z.Ma, C.Xiang, Investigation on the dielectric properties of (Ba,Sr)TiO3 thin films on hybrid electrodes, Materials Chemistry and Physics,2010,121:28–31
Oil field chemistry, 2001, 18(3): 268-272

Enzyme-Mediated Grafting of AGE to Kevlar Fiber using Horseradish Peroxidase Yang Liu , Guozheng Liang, Aijuan Gu and Li Yuan College of Chemistry, Chemical Engineering and Materials Science, Department of Materials Science and Engineering, Soochow University, Suzhou, Jiangsu ,215123, China yanyilu200504@163.com Key words: Enzyme-mediated, AGE, Surface modification, Kevlar fiber Abstract.
At present, with the strengthening of environmental protection consciousness, as an important part of green chemistry, biological catalyst enzymes used in the synthesis and modification of polymers, become a new hotspot in the advanced countries.
Figure 3 X-ray diffraction curve of Kevlar fiber shows, gathered Kevlar fiber there state two phase structure (crystallization and amorphous).
From the crystalline structure parameters of Kevlar fiber in table 3,we know the biggest crystallinity is 62.33% of KF, the minimum crystallinity is 57.56% of 6# .
[6] Wu G.M,Oxygen Plasma Treatment of High Performance Fibers for Composites,Materials Chemistry and Physics,2004,85:81~87

Results and Discussion Structure and morphology.
Fig.2 (b) is the SEM image of S-0, which was a simple film without inverse opal structure.
Moreover, the decoloration of the system with photocatalyst S-2 which has inverse opal structure has a two times speed of the system with S-0 without inverse opal structure.
Fornasiero: Journal of Physical Chemistry A. 114 (2010) 3916-3925
Stein: Journal of Materials Chemistry. 14 (2004) 1616-1622

Studies show that it has a significant influence on the UHMWPE structure, which was described for polymer GUR1020 [9,10].
The discussed results are confirmed by SEM observation of the lamellar structure made with the use of etching technique (Fig. 2).
The lamellar structure of GUR 1050 irradiated 6 times before (a) and after (b) thermal treatment Fig. 3.
Horák, The modification of ultra-high-molecular-weight polyethylene supramolecular structures induced by irradiation and thermal treatment.
Flory, Principles of Polymer Chemistry.