Search results

PROTEIN ADSORPTION ON TOPOGRAPHICALLY STRUCTURED SURFACES: A MESOSCOPIC COMPUTER SIMULATION FOR THE PREDICTION OF PREFERED ADSORPTION SITES P.Elter1,a, R.
During the past decades, a large number of experiments focus on the adsorption process of proteins and indicate a strong influence of the surface chemistry of the adsorbent as well as salt concentration and pH of the electrolyte.
For example an increased adsorption of F-Actin at stripes and edges was observed on nanostructured titanium with structure heights of 1-2 nm and proteins were aligned parallel to the nanostructure [3].

However, the material properties for both require a careful control of grain structure as well as microstructure design to meet specific applications.
Their magnetic properties arise from interactions between metallic ions occupying particular positions relative to the oxygen ions in its hexagonal crystalline structure.
Recent studies have shown that the synthesis of nanocrystalline powders of BHF is being the main focuses of current researchs in order to improve magnetic properties through an increase surface to volume ratio in a nanocrystalline structure.
Referring to data compilation of lattice constant “a” for BaxSr1-xTiO3 (BST) “single crystals made by Bethe dan Welz [21]”, the perovskite structure of BST has the lattice constant changed with x linearly according to an empirical relation a = 0.092 x + 3.905 (Å).
Mastelaro: Materials Chemistry and Physics 125 (2011), p. 168–173

The composites showed a porous structure, proper swelling behaviour for wound exudates and degradation in time.
Introduction Wound repair is a coordinated series of cellular and biochemical events which requires complex and dynamic processes that restore cellular structures and tissues layers.
It is the most abundant protein in mammals and, as biomaterial, has the proper properties to mimic tissue such as pore structure, permeability and hydrophilicity.
The changes in sample structures could be seen from water absorption results, presented in Figure 3.
The composites showed a porous structure, proper swelling behaviour for wound exudates and degradation in time.

Metal particles as well as spinel can be distributed uniformly in a ceramic matrix or can form graded structures.
As a result, two main types of microstructure can be expected (Fig. 3): a) a uniform distribution of metal particles and/or a new phase, b) a non-uniform distribution of metal particles and/or a new phase (a graded structure).
Metal particles (black circles) distribution in a ceramic matrix: A) a uniform distribution of metal particles, B) a graded structure, change of metal particles concentration in one direction The most important reason for introducing metal particles into a ceramic matrix is a resulting improvement in the fracture toughness.
Such a structure can be obtained by using powder metallurgy processes or by colloidal methods, for example slip or tape casting.
Szafran from the Faculty of Chemistry of Warsaw University of Technology and his team for collaboration and M.Sc. and Ph.D. students who were involved in the experiments.

Spherical nature, unique size-distribution and crystal structure of the AgNPs with diameter around 10-20 nm were affirmed by TEM and XRD analyses.
Based on the principle of green chemistry, we investigated a green approach for preparation of AgNPs by the reduction of Ag+ ions to Ag° with bio-reductants in the leaf extract of Piper betle L.
To further confirm the crystal structure of the AgNPs, the XRD analysis was employed.
Furthermore, the diffraction peaks data of the AgNPs were in accordance with the reports of the face center cubic (FCC) structure [11-13].
The functional groups of PBL extract involved in the reduction of silver ions to silver metal and the face center cubic structure of the AgNPs were affirmed via the FT-IR and XRD studies, respectively.

Degradation Properties of Ti/Sb-SnO2 Electrodes Containing Different Intermediate Layers for Phenol Zhen Zhang1, a, Qianqian Sun1, b and Yinping Si2, c 1School of Chemistry and Chemical Engineering, South China University of Technology, the Key Laboratory of Fuel Cell Technology of Guangdong Province, 510640, Guangzhou, China 2National Testing and Quality Supervision Center of Furniture, Shunde 528300, Guangdong, China achzzhang@scut.edu.cn, bsqq9842@163.com, csixinzhi130@126.com Keywords: Ti/Sb-SnO2 electrode, Electrocatalytic oxidation, Phenol solution, Service life of electrode.
Therefore it may be concluded that the different intermediate layers have a notable effect on the structure, morphology, service life and the electrocatalytic activity of anode.
Electrochemical treatment technique, developed in recent years, has attracted more attention due to simplicity in structure, ease in operation, universality in application, and ease in combined with other treatment method.
For anodes using Ti as a substrate, the service life is in connection with structure of intermediate and active layers.
Liu, Influence of rare earths doping on the structure and electro-catalytic performance of Ti/Sb-SnO2 electrodes, J.

Al-Sammarraie3,c 1,2Department of Physics, College of Science, University of Baghdad, Iraq. 3Department of Chemistry, College of Science, University of Baghdad, Iraq.
XRD measurement confirmed that the structure of MWCNTs is not affected by the preparation method.
The figure appears that the peak of (002) belong to the MWCNTs-OH network overlaps with the peak of Whatman filter paper of direction (200), this is may be due to the structure of the network and the cavities inside it.
The surface roughness average (Sa) of the net is about 1.27 nm which improve that the film has well dispersive and displayed the granular structure.
XRD measurement for the prepared network confirmed that the structure of MWCNTs is not affected by the preparation method.

At higher Al contents a mixed (NaCl+ZnS-wurtzite) structure is formed, or the films display completely a ZnS-wurtzite(w) structure [17,18].
For non-cubic structures (TiAl, TiN and AlN in wurtzite structure) the volume optimization was performed with the fixed c/a ratio taken from experimental data.
Calculated lattice parameters and total energies for various structures.
The cubic NaCl structure is more stable than wurtzite ZnS for TiN, whereas the wurtzite ZnS structure is more stable for AlN.
Neuschutz: Fresenius' journal of analytical chemistry Vol. 361(6-7) (1998) p.639

For the high temperature melt, the viscosity relates to the structure of melt, and the structure of melt depends on the chemical composition and the temperature [12,13].
Melilite crystals was the xenomorphic structure [19] which depended on small crystalline size and obscure the optical properties.
The crystalline size of perovskite was appreciably increased and gowth in the boundary of melilite crystals, most perovskite crystals as the hypidiomorphic structure.
As the amount of additive TiO2 was more than 15mass%, melilite and wollastonite crystals as the hypidiomorphic and xenomorphic structure were precipitated as the principal crystals in mold fluxes, other than perovskite as the idiomorphic structure.
Rao: Silicate Physical Chemistry (Metallurgical Industry Press, Beijing 1996)

To complete the MFM and MFIS structures, an array of circular top contacts with a diameter of 1 mm was formed by depositing Al films.
The MFIS structure was formed for the measurements of the capacitance-voltage (C-V) and leakage current density-electric filed (J-E) characteristics and the MFM structure was formed for the measurements of the polarization-electric field (P-E) curves.
The C-V curves of KBT-BT3 films are developed in the MFIS structure and the results are shown in Fig. 5.
Yan, Lead-free(K0.5Bi0.5)TiO3 powders and ceramics prepared by a sol-gel method, Materials Chemistry and Physics, 99 (2006) 329-332
Huang, The Crystal Structures and Dielectric Properties of Bi2O3 Doped SrBi2Ta2O9 Ceramics, Mater.