Boosting electrical conductivity of textiles via fabrication of silver nano-ribbons using the fiber templates

This research has accomplished an exceptional achievement to synthesize metallic nano-ribbons. A simple and fast spray method has been used to fabrication the metallic ribbon-shape nanostructures on the cotton fabrics. In fact cotton fabrics can act as a good template directing the shape of nanostructures. The method to achieve this end has been reported and discussed. The SEM micrographs demonstrated the nano-ribbon fabrication. Evaluation the electrical conductivity disclosed that electrical resistance of fabrics containing the silver nano-ribbons has been decrease about 7640 times as compared to untreated one. In fact electrical resistance has been declined from 6.53×109.cm-1 on treated fabrics to 8.55 ×105.cm-1 on untreated fabrics. Consequently, applying this technique decreases the electrical resistance by four orders of magnitude. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2063

Nanowire fabrication on cotton surfaces: effect of the pretreatment

Anisotropic nanostructures such as nano-wires, nano-tubes, nano-rods, nanoribbons, nano-layers, etc. are extremely attracted due to their larger surface area as compared to nano-particles. This research has targeted at fabrication of the metallic nano-wires through a simple one-step pad-dry method. The effects of mercerizing as one of the most common and important finishing treatments on cotton fabrics have been investigated. Mercerized and un-mercerized fabrics with the same structures have been treated and compared. SEM micrographs confirmed fabrication of the nano-wires with a high aspect ratio on the fiber surfaces oriented parallel with fiber axes. An enhanced potentiality for growing nano-wires with higher level of orientation has been observed for mercerized fabrics compared to un-mercerized ones. As it is well known, mercerizing can cause some structural changes in cotton fibers. Reduction of crystallinity as a result of this process (mercerizing) leads to increasing the amorphous regions which have a good potentiality for growing nano-structured materials. The higher moisture regains, absorbency, smoother morphology, etc. caused by mercerizing can direct the better growth of nano-structures on mercerized fabrics. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2063

Photochemical reduction of silver nitrate to nano silver using stannous chloride, ctab and daylight irradiation

Silver nanoparticles (NPs) were synthesized and stabilized by a simple method in aqueous solution, by the reduction of silver nitrate with stannous chloride (SnCl2.2H2O) and cetyl trimethyl ammonium bromide (CTAB)through day light irradiation. Thereby, the silver nanoparticles were colloidally stabilized by CTAB as a surfactant. The synthesis of silver NPs with different size were possible by changing the reaction conditions such as reagent ratio. The silver NPs were characterized by Dynamic Light Scattering (DLS) and UV-visible spectroscopy. A very strong plasmon resonance peak at 400-500 nm in the UV-visible spectra is a clear consequence of the silver NPs production. The synthesized silver NPs showed good stability by using CTAB. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/2063

Electrochemical migration technique to accelerate ageing of cementitious materials

Durability assessment of concrete structures for constructions in nuclear waste repositories requires long term service life predictions. As deposition of low and intermediate level radioactive waste (LILW) takes up to 100 000 years, it is necessary to analyze the service life of cementitious materials in this time perspective. Using acceleration methods producing aged specimens would decrease the need of extrapolating short term data sets. Laboratory methods are therefore, needed for accelerating the ageing process without making any influencing distortion in the properties of the materials. This paper presents an electro-chemical migration method to increase the rate of calcium leaching from cementitious specimens. This method is developed based on the fact that major long term deterioration process of hardened cement paste in concrete structures for deposition of LILW is due to slow diffusion of calcium ions. In this method the cementitious specimen is placed in an electrochemical cell as a porous path way through which ions can migrate at a rate far higher than diffusion process. The electrical field is applied to the cell in a way to accelerate the ion migration without making destructions in the specimens micro and macroscopic properties. The anolyte and catholyte solutions are designed favoring dissolution of calcium hydroxide and compensating for the leached calcium ions with another ion like lithium