The synthesis of mesoporous silica is considered as one of the four most important discoveries in solid-state and materials science in the last decade. They consist of regular pores with diameter between 2-50 nm. Incorporation of different groups in their walls enables them for cracking of large molecule; even they can act as redox catalysts. The extension of the application fields from catalysis and sorption into new areas, such as optic and electronics is very important.The first report of this new class of materials presented by Kresge et al in 1992.These new products, known under the group name M4IS, with the hexagonal MCM- 41. Here we use hexadecyl trimethyl ammonium chloride as templating agent for synthesis nanostructured titanium silicate. Synthesized materials were characterized by low angle XRD.

Field effect transistor is of importance in the integrated circuit. The metal electrode is on a silicon dioxide layer and is grown on a silicon substrate. We used silver as the electrode. The structural properties of a single silver layer on top of the silicon oxide film has been studied using synchrotron radiation, sensitive to changes in a chemical environment, permits high resolution photoelectron spectroscopy of nano thickness silver film on top of oxide. The local variations of the Ag /Sio2/si demonstrated a good uniformity of coverage oxide film and the weaker electrical field across the thinner oxide film (< 2 nm) respect to thicker oxide film.

In this paper, we study the phonon thermal properties of a ladder nanostructure in harmonic approximation. We present a model consisting of two infinite chains with different masses. Then, we investigate the effect of different masses on the phonon spectrum. Moreover, as a specific case, in the absence of the second neighbor interaction, we calculate the phonon density of states/modes.Finally, we consider the thermal conductivity of the system. The results show that the phonon spectrum shifts down to the lower frequencies by increasing the masses. Furthermore, a frequency gap appears in the phonon spectrum. By increasing the springs constants, the thermal conductance decreases.

The materials with spinel structures are important for their unique structural and physical properties. In the current research, nanocrystalline hercynite was synthesized using metal nitrates and a polymer matrix precursor composed of sucrose and polyvinyl alcohol (PVA) via sol-gel process. The gel was dried and then the precursor was preheated at1000oC in the air atmosphere and then calcined at different temperatures in the reducing atmosphere in the graphite bed. The preheated and calcined powders were characterized using simultaneous thermal analysis, X-ray diffraction (XRD) and field emission scanning electron microscopy (SEM). Results showed that fullycrystalline hercynite was detected in the sample calcined at 900oC. The crystal size of hercynite was different at each calcination temperature, ranging from 30 to100nm.VSM analysis indicated that hercynite is a paramagnetic material.