Tailoring the structural, morphological, optical, thermal and dielectric characteristics of ZnO nanoparticles using starch as a capping agent

Publication date: December 2019Source: Results in Physics, Volume 15Author(s): Suresh Sagadevan, S. Vennila, J. Anita Lett, A.R. Marlinda, Nor Aliya Binti Hamizi, Mohd. Rafie JohanAbstractUsing Starch as a capping agent, zinc oxide (ZnO) nanoparticles (NPs) have been synthesized by the low cost and simple chemical precipitation technique. The confirmation of the hexagonal crystal structure of ZnO NPs were demonstrated by X-ray powder diffraction (XRD) pattern. The Fourier-transform infrared spectroscopy (FTIR) spectroscopy confirms Zn-O stretching vibrations. The scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) images reveal the surface morphological properties of ZnO NPs. Optical properties were investigated by UV–Visible spectroscopy. The optical characterization shows that the ZnO NPs exhibits a low absorbance in the visible range. Thermal behavior of ZnO NPs studied using thermogravimetric analysis (TGA) and differential thermal analysis (DTA). Dielectric properties of ZnO NPs are analysed in the different frequencies at different temperatures. The dielectric properties of ZnO NPs were attributed to the interfacial polarization at low frequencies and orientational polarization at higher frequencies. Therefore, the synthesis method has potential for application in manufacturing units due to ease processing and more economical reagents.
Source: Results in Physics - Category: Physics Source Type: research

Related Links:

In conclusion, the bio-composite M-HAP/PSSG is better scaffold for coating on the surface of Ti implant for orthopedic implantation.Graphical abstract
Source: Biomedicine and Pharmacotherapy - Category: Drugs & Pharmacology Source Type: research
ConclusionsBoth 18F-HX4 and 18F-FMISO PET/CT can be used as biomarkers for tumor hypoxia and radiotherapy-associated changes. The clinical utilization of these two PET tracers needs to be further validated.
Source: Biomedicine and Pharmacotherapy - Category: Drugs & Pharmacology Source Type: research
Abstract Derivatization is frequently used in liquid chromatography-mass spectrometry (LC-MS) to improve the ionization characteristics of analytes, and facilitate their structural elucidation and quantification. However, the off-line derivatization process usually requires more analysis time. Therefore, the present work develops a novel LC/post-column derivatization (PCD)/MS (LC-PCD-MS) method for rapid detection of aldehydes in complex samples. The PCD method is based on a bisulfite addition reaction with aldehydes that can be easily conducted by mixing the LC elute with an (NH4)2SO3 solution via a tee. The resu...
Source: Talanta - Category: Chemistry Authors: Tags: Talanta Source Type: research
Abstract In the present work, an analytical approach for the voltammetric detection and prediction of adulteration of fresh cow milk with reconstituted skim milk powder is developed. After precipitation of milk proteins upon addition of ethanol and centrifugation, the supernatant liquid of the samples was analyzed by cyclic voltammetry on a novel graphite/SiO2 hybrid working electrode (GSiHE) using LiClO4 as electrolyte. Under these conditions, fresh milk samples gave broadened peaks/plateaus in both forward and backward potential scanning, attributed mainly to oxidases. Such peaks were not evident in the case of ...
Source: Talanta - Category: Chemistry Authors: Tags: Talanta Source Type: research
Abstract Proteinase K (ProK) is used for the degradation of proteins in cell lysates to isolate nucleic acids, and for the speciation of proteins for mass spectrometry analysis. In this work, a novel and sensitive immobilization process was developed for examination of protein mixtures by combining MALDI-ToF-MS and nLC-TIMS-ToF-MS/MS systems. To achieve these goals, magnetic nanoparticles (MPs) were prepared via thermal coprecipitation reaction under alkaline condition. The MPs were grafted with a silica layer (i.e., 3-(2,3-epoxypropoxy) propyltrimethoxysilane; EPTES) containing reactive epoxy groups. Then, the si...
Source: Talanta - Category: Chemistry Authors: Tags: Talanta Source Type: research
Abstract Organic compounds and vegetable origin oils are subject to scratiny in the photonics and nonlinear optics area, due to their high non-linear response: a characteristic linked to the molecular nature of these compounds and their own chemical bond. In the food industry, quick and non-invasive studies are needed to evaluate the nutritional quality of edible products. The nonlinear optical response of 4 vegetable oils was analyzed: extra virgin olive oil (EVOO), extra virgin sesame oil (EVSO), extra refined linseed oil (ERLO) and virgin avocado oil (VAVO), using the Z-scan technique. Where the third order ele...
Source: Talanta - Category: Chemistry Authors: Tags: Talanta Source Type: research
In this study, we developed an impedimetric sensor system by using molecularly cortisol imprinted acrylamide polymers on fullerene modified carbon electrode to detect cortisol in real saliva samples. The polymer layer was formed on fullerene modified screen printed carbon electrodes with the ratio of 1:2 (cortisol:acrylamide) and ammonium persulfate (APS) was used as the initiator of polymerization. The sensor surface was investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and Scanning Electron Microscopy (SEM). Performances of the electrode were determined as follows; calibration curve wa...
Source: Talanta - Category: Chemistry Authors: Tags: Talanta Source Type: research
Publication date: Available online 14 September 2019Source: Materials Today: ProceedingsAuthor(s): A. Muthumanickkam, S. Subramanian, M. Sathiyaraj, P. Preethi, M. AshwiniAbstractThe Nigella sativa loaded eri silk fibroin nanofibrous mat was produced by electrospinning technique. The physical and chemical characteristics of electrospun mats were studied for Scanning electron microscopy (SEM), X-ray diffraction (XRD), thermo gravimetric analysis (TGA) and Fourier transform infrared spectroscopy (FTIR). The antimicrobial activity and blood compatibility and drug release profile of the mats were studied. The study showed that...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
In this study, effects of natural aging as an interlude on the mechanical properties of artificially aged SiCp/6092Al composite and 6092Al alloy were investigated using tension test, electrical conductivity test, differential scanning calorimetry and transmission electron microscopy. It was shown that the strength of both the composite and 6092Al alloy after artificial aging was decreased due to the precedent natural aging. Compared to 6092Al alloy, the composite had smaller strength decrement. However, qualitative analysis based on load transfer indicated that the negative influence of natural aging was stronger in the co...
Source: Materials Science and Engineering: A - Category: Materials Science Source Type: research
Publication date: 1 January 2020Source: Materials Chemistry and Physics, Volume 239Author(s): Dalva A.L. Almeida, Neidenei G. FerreiraAbstractRecent studies show that polyaniline (PAni) is one of the widely studied materials because it is easy synthesis, less cost, and low environmental pollution. Moreover, it presents a high theoretical specific capacitance as compared to carbon-based electrodes. Besides, when combined with materials such as porous carbon, graphene, carbon fiber, among others, the resulting electrodes composites present high electrochemical performance with feature commercially viable for practical applic...
Source: Materials Chemistry and Physics - Category: Materials Science Source Type: research
More News: Chemistry | Nanotechnology | PET Scan | Physics | Zinc