Search Results

You are looking at 41 - 50 of 569 items for :

  • "nanoparticle" x
  • All content x
Clear All

. 3. Fazal , H. , Abbasi , B. H. , Ahmad , N. , Ali , M. ( 2016 ) Elicitation of medicinally important antioxidant secondary metabolites with silver and gold nanoparticles in callus cultures

Restricted access
Journal of Radioanalytical and Nuclear Chemistry
Authors: Debasish Das, M. Sureshkumar, Siddhartha Koley, Nidhi Mithal, and C. Pillai

Abstract  

Magnetite (Fe3O4) nanoparticle was synthesized using a solid state mechanochemical method and used for studying the sorption of uranium(VI) from aqueous solution onto the nanomaterial. The synthesized product is characterized using SEM, XRD and XPS. The particles were found to be largely agglomerated. XPS analysis showed that Fe(II)/Fe(III) ratio of the product is 0.58. Sorption of uranium on the synthesized nanomaterials was studied as a function of various operational parameters such as pH, initial metal ion concentration, ionic strength and contact time. pH studies showed that uranium sorption on magnetite is maximum in neutral solution. Uranium sorption onto magnetite showed two step kinetics, an initial fast sorption completing in 4–6 h followed by a slow uptake extending to several days. XPS analysis of the nanoparticle after sorption of uranium showed presence of the reduced species U(IV) on the nanoparticle surface. Fe(II)/Fe(III) ratio of the nanoparticle after uranium sorption was found to be 0.48, lower than the initial value indicating that some of the ferrous ion might be oxidized in the presence of uranium(VI). Uranium sorption studies were also conducted with effluent from ammonium diuranate precipitation process having a uranium concentration of about 4 ppm. 42% removal was observed during 6 h of equilibration.

Restricted access

such as polymers [ 2 ], silica and silicate layers [ 3 ], microporous [ 4 ], mesoporous materials have been used in achieving this goal [ 5 ]. Recent utilization of magnetic nanoparticles as solid supports of oxidation and epoxidation catalysts is a new

Restricted access

. Microwave-assisted route is expensive and handled carefully. Thus, for a special purpose to develop a more convenient and rapid way for synthesizing Bi 2 Te 3 nanoparticles (NPs) is required. Therefore, low-cost and less hazardous wet-chemical route has

Restricted access

surface energy. It is, therefore, necessary to incorporate them into other matrix such as glass, polymer, etc. The polymer is the best choice as matrix material because it can bring several advantages [ 6 ] such as stability of nano-particles, improvement

Restricted access
Journal of Thermal Analysis and Calorimetry
Authors: Ellen Denise P. Almeida, Adjane A. Costa, Mairim R. Serafini, Fábia C. Rossetti, Juliana M. Marchetti, Victor Hugo V. Sarmento, Rogéria de S. Nunes, Mário Ernesto G. Valerio, Adriano A.S. Araújo, and Ana Amélia M. Lira

association to specific drug delivery systems for clinical use. Solid lipid nanoparticles (SLN) are alternative colloidal carrier systems for controlled drug delivery with a mean diameter between approximately 50 and 1,000 nm, which presents some

Restricted access

Abstract  

This work concerns the study of Al–Ni bimetallic nanoparticles synthesized by gamma-radiolysis of aqueous solution containing aluminium chloride hexahydrate, nickel chloride hexahydrate, polyvinyl alcohol for capping colloidal nanoparticles, and isopropanol as radical scavenger. While the Al/Ni molar ratio is kept constant, size of the nanoparticles can be well controlled by varying the radiation dose. The products were characterized by UV–vis spectroscopy, transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction analysis (XRD). Observations of UV–vis absorption spectra and TEM images showed that as the radiation dose increases from 50 to 100 kGy the particle size decreases and the number particles distribution increases. It may be explained due to the competition between nucleation and aggregation processes in the formation of metallic nanoparticles under irradiation. The EDX and XRD analysis confirmed directly the formation of Al–Ni bimetallic nanoparticles in form of alloy nanoparticles.

Restricted access

antioxidants in preventing skin aging and photo-aging in several pharmaceutical and cosmetic formulations. In addition, lipid nanoparticles (LN) have been reported useful as topical drug carriers [ 6 , 7 ]. Thus, it is most likely that the combination of pure

Restricted access
Journal of Flow Chemistry
Authors: Matthew Simmons, Charlotte Wiles, Vincent Rocher, M. Grazia Francesconi, and Paul Watts

Abstract

The preparation of magnetic iron oxide nanoparticles within microreactors is reported. The proportion of γ-Fe2O3 and Fe3O4 in the sample was determined, an important parameter for reproducibility in applications.

Restricted access

Introduction The current tendency of using oxidic materials as nanoparticles leaded to the permanent development of new unconventional synthesis methods [ 1 – 4 ]. This is due to the different properties of the nanomaterials

Restricted access