A critical research area overlooked in previous studies on Nano-silica material is the understanding of how its physical characteristics influence its final behavior as a composite when added to the asphalt binder. This study aimed to understand the feasibility of modifying the Nanosilica with asphalt binder based on the asphalt binder characteristics. 60/70 penetration grade asphalt cement was prepared by adding (2%, 4% and 6%) of Nanosilica by weight of asphalt. Properties of Nanosilica material and asphalt cement were first examined. To prepare the modified asphalt binder was heated at 140C, blended by mechanical mixer at a speed of 2000 rpm for different mixing durations (30 to 60) minute. The modified asphalt binder was examined for rheological properties including penetration grade, softening point temperature, penetration index, Brookfield rotational viscosity and ductility test. Results shows that the modified asphalt binder stiffness increases based on rheological properties and sensitivity of temperature decreases with increasing Nanosilica percentage. A­4 % Nano silica by asphalt weight enhanced the conventional properties of the modified asphalt binder and became proper in hot weather conditions. While ductility of modified asphalt decreases with increasing Nano silica percentage, due to stiffness and agglomeration increased. Finally, longer mixing time to more than 60 min had an adverse effect on the ductility property and lead to agglomeration of Nanosilica modified asphalt binder.

The materials that are now being used in the conservation of historic and cultural heritage are originally available in the market of industry. Recently, some of the materials are improved in the fields of conservation of heritage and they are so common in the consolidation of artificial objects or monuments. The aim of the study is identification of the proper material for consolidation of beige stone against environmental factors. Thus, three materials were chosen from the recent products which are more compatible with composition of limestone. Stone specimens were consolidated with Nano Estel (Nanostructure silicon dioxide SiO2 dispersion in water), Nano Lime (Ca(OH)2) (Nano-lime dispersion in isopropyl alcohol), and Dibasic ammonium phosphate ((NH4)2HPO4) well known as HAP method. Samples were characterized by FE-SEM and tested by Microdrilling resistance. The porosity also was analyzed by MIP. The results show Nano-lime has the lowest surface effectiveness which barely changed the physical properties of the stone in comparison with the others. In the case of covering, in both Estel and HAP, some microcracks (with branch and net pattern) were observed on the layer above substrate, in contrast, Nano-lime made a homogeneous layer. Also, Nano-lime treatment caused 6% reduction of the porosity which had the most effectiveness on stone porosity. J. Color Sci. Tech. 12(2018), 1-12© . Institute for Color Science and Technology.

In this paper, the morphology, roughness and Nano structural properties of SiO2/Poly Vinyl Pyrrolidone synthesized with sol gel method, characterized by using scanning electron microscopy, atomic force microscopy and GPS132A techniques. The main material taken from oxide silicon with weight percentage of 20, 40, 60, 80 and from poly vinyl pyrrolidone with percentages of 80, 60, 40, 20 is synthesized and are called sample 1, 2, 3 and 4 respectively. The samples using lower poly vinyl pyrrolidone (PVP: SiO2; 2: 3 in Weight) can be suitable choices in producing organic field-effect transistors due to their better structuralquality, less energy loss, less roughness sample surface, higher dielectric constant (K=15.99) and better surface morphology as determined with applying DME SPM software and above techniques. This sample can be thus considered as a good element of the future organic field-effect transistors devices.

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.

With the growing progress in the use of concrete, novel technologies have been introduced into the production of this building material. Self-consolidating concrete (SCC) is one of the concrete types, which has been extensively applied in building industry nowadays. SCC could be empowered in terms of durability and mechanical properties and, as a result, the service-life of SCC and efficiency of concrete structures could be increased using complementary materials such as Pozzolans and Nano-materials. Considering their structures, Nano-materials such as Nano-silica, Nano-calcium carbonate and other similar materials could be helpful in making SCC. This paper aims to investigate the effect of Nano-calcium carbonate and Nano-silica on the durability and mechanical characteristics of SCC. Thus, different concrete forms with the mixture designs containing 0%, 1%, 2% and 3% Nano-calcium carbonate and Nano-silica were developed. The samples were made in 15*15*15 cubic and cylindrical forms, depending on the experiment type, and tested at the ages of 7 and 28 days. In all the mixture designs, the rheological tests relating to fresh concrete including concrete flow, slump test, V-funnel, L-box, J-ring and U-box tests were performed. Finally, in order to examine the durability, permeability, freeze and thaw cycle, electrical resistance and pulse rate determination in concrete were employed. At the end, micro-structural properties of concrete containing Nano-carbonate were tested using XRD and SEM tests. In all the samples, use of Nano-calcium carbonate increased durability and resistance properties of SCC.

Quantitative recovery of terephthalic acid (TPA) from poly (ethylene terephthalate) (PET) wastes is reported under controllable microwave irradiation in the presence of diethylene glycol (DEG) as the solvent in combination with NaOH and Nano-Fe3O4@SiO2 as the catalyst and solid support, respectively. The reaction was performed in mono-mode microwave reactor and the weight ratios of DEG: PET, NaOH: PET and Nano-Fe3O4@SiO2:NaOH were investigated in detail. Obtained results revealed that in the presence of NaOH (0.4 g), Nano-Fe3O4@SiO2 (1 g) and PET: DEG molar ratios (1:6), TPA was obtained in high recovery yield (96%). At the end of the reaction, Nano-Fe3O4@SiO2 was recovered by simple magnetic decantation and reused for several times without observing significant decrements in TPA recovery yields.