Characterization Of Zinc Oxide Nanoparticles Research Articles

A non-aqueous synthesis, characterization of zinc oxide nanoparticles and their interaction with DNA

Recently, inorganic nanoparticles are striking material because of their high surface area, easy to enter in cells and proteins due to very small size (1–100 nm range), sensing and detection of various biological systems. The presence of semiconductor metal oxide nanoparticles in the biological system suggested the fundamental understanding and their role. In this regard we first synthesized zinc oxide nanoparticles (ZnO-NPs) using first time octadecylamine as a source material with zinc acetate di-hydrate by the well known solution route and characterized with various morphological and chemical tools such as XRD, FESEM, TEM, AFM and FTIR spectroscopy. The doses of nanoparticles at different amounts (0.5–5 mg/ml conc.) were treated with the 100 bp DNA at different electrophoratic times (20, 30 and 40 min) intervals. The visualization of DNA was confirmed by the slab-gel electrophoresis measurements whereas, the interaction of zinc oxide nanoparticles with DNA was observed by UV–vis and AFM spectroscopy. In addition to this, Surface bonded states of zinc Zn 2p1/2, Zn 2p3/2, and N 1s peaks clearly indicate the attachment of DNA by using X-ray photoelectron spectroscopy.

A Comparative Study of Multifunctional Finishing of Cotton and P/C Blended Fabrics Treated with Titanium Dioxide/zinc Oxide Nanoparticles

Research outcome on the syntheses and characterizations of Titanium dioxide (TiO 2 ) and Zinc Oxide (ZnO) nanoparticles and their applications on cotton and polyester/cotton blended fabrics for imparting multifunctional properties (viz.Anti-bacterial protection, self-cleaning and UV protection) are reported. The nanoparticles of TiO 2 and ZnO were produced separately in different conditions of chemical reactions using soft chemistry. These synthesized nanoparticles were characterized by F ourier T ransformed I nfrared S pectroscopy (FTIR), T ransmission E lectron M icroscopy (TEM), and X -ray powder D iffractometry (XRD) for assessing the composition, shape, size and crystallinity respectively. These TiO 2 and ZnO nanoparticles were then applied to 100% cotton and 45/55% polyester/cotton

Fabrication and characterization of zinc oxide nanoparticles by DC arc plasma

Zinc oxide nanoparticles were synthesized by DC arc plasma in pure oxygen atmosphere. High DC currents were passed through two approaching zinc rods in different oxygen pressures between 50 to 5000 mbars. Samples were characterized by TEM, SEM, XRD and electron diffraction analysis. The formation of zinc oxide nanoparticles were successfully proved by those analyses, although in some cases we had some unwanted materials. The XRD patterns show crystalline formation of zinc oxide, but in low pressures we have an excess peak belong to pure zinc. The height of this peak was reduced by increase in oxygen pressure and finally vanished completely at high pressure. The TEM and SEM images of samples show that in low pressures the samples mainly tend to have rod like shapes structures, but by increasing the oxygen pressure the structures steady revolve to the hexagonal nanocrystals. Upon the resulted data, the best conditions of arc plasma for desire product were inferred.

Synthesis and characterization of zinc oxide nanoparticles: application to textiles as UV-absorbers

We report the synthesis and characterization of nanosized zinc oxide particles and their application on cotton and wool fabrics for UV shielding. The nanoparticles were produced in different conditions of temperature (90 or 150 °C) and reacting medium (water or 1,2-ethanediol). A high temperature was necessary to obtain small monodispersed particles. Fourier transformed infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and X-ray powder diffractometry (XRD) were used to characterize the nanoparticles composition, their shape, size and crystallinity. The specific surface area of the dry powders was also determined. ZnO nanoparticles were then applied to cotton and wool samples to impart sunscreen activity to the treated textiles. The effectiveness of the treatment was assessed through UV–Vis spectrophotometry and the calculation of the ultraviolet protection factor (UPF). Physical tests (tensile strength and elongation) were performed on the fabrics before and after the treatment with ZnO nanoparticles.

Synthesis and characterization of zinc oxide nanoparticles by laser ablation of zinc in liquid

We report formation of colloidal suspension of zinc oxide nanoparticles by pulsed laser ablation of a zinc metal target at room temperature in different liquid environment. We have used photoluminescence, atomic force microscopy and X-ray diffraction to characterize the nanoparticles. The sample ablated in deionized water showed the photoluminescence peak at 384 nm (3.23 eV), whereas peaks at 370 nm (3.35 eV) were observed for sample prepared in isopropanol. The use of water and isopropanol as a solvent yielded spherical nanoparticles of 14–20 nm while in acetone we found two types of particles, one spherical nanoparticles with sizes around 100 nm and another platelet-like structure of 1 μm in diameter and 40 nm in width. The absorption peak of samples prepared in deionized water and isopropanol are seen to be substantially blue shifted relative to that of the bulk zinc oxide due to the strong confinement effect. The technique offers an alternative for preparing the nanoparticles of active metal.

Characterization of zinc oxide nanoparticles encapsulated into zeolite-Y: An in-situ combined X-ray diffraction, XAFS, and SAXS study

Characterization of zinc oxide containing zeolite Y was performed employing time-resolved in situ small angle X-ray scattering (SAXS), WAXS and EXAFS techniques. Extending procedures used previously for the preparation of CdO clusters in side zeolite cages, zinc oxide particles have been successfully prepared within the cavities of zeolite Y. The preparation entails ion-exchange of Zn(II) followed by treatment with an alkaline solution before thermal treatment to produce oxide particles. Experimental results give strong evidence for the formation of small zinc oxide clusters with sizes in the range of 10–20 Å. Particle sizes estimated from the analysis of EXAFS and SAXS data are consistent with the cavity size of zeolite Y.