Carina Rego Research fellow. Zexuan Wang Research fellow. Rajesh Reddy Research fellow. Nadia Licciardello Research fellow.
Master Nanosciences - Université Grenoble Alpes - Master 2 Nanochemistry and Nano-objects
Viviana Sousa Research Fellow. Vanessa Cardoso Scientific Associate.
Orlando Oliveira Research Laboratory Assistant. The ultrasonic preparation method results in a higher surfactant concentration within the montmorillonite interlayer when compared with that from the hydrothermal method. Three different molecular environments for surfactants within the surface-modified montmorillonite are proposed upon the basis of their different decomposition temperatures.
TEM images of organoclays prepared at high surfactant concentrations show alternate basal spacings between neighboring layers. SEM images show that modification with surfactant reduces the clay particle size and aggregation. Organoclays prepared at low surfactant concentration display curved flakes, whereas they become flat with increasing intercalated surfactant. Novel surfactant-modified montmorillonite results in the formation of new nanophases with the potential for the removal of organic impurities from aqueous media. X-ray photoelectron spectroscopy XPS in combination with X-ray diffraction XRD and high-resolution thermogravimetric analysis HRTG has been used to investigate the surfactant distribution within the organoclays prepared at different X-ray photoelectron spectroscopy XPS in combination with X-ray diffraction XRD and high-resolution thermogravimetric analysis HRTG has been used to investigate the surfactant distribution within the organoclays prepared at different surfactant concentrations.
This study demonstrates that the surfactant distribution within the organoclays depends strongly on the surfactant loadings. In the organoclays prepared at relative low surfactant concentrations, the surfactant cations mainly locate in the clay interlayer, whereas the surfactants occupy both the clay interlayer space and the interparticle pores in the organoclays prepared at high surfactant concentrations. This is in accordance with the dramatic pore volume decrease of organoclays compared to those of starting clays.
High-resolution XPS spectra show that the modification of clay with surfactants has prominent influences on the binding energies of the atoms in both clays and surfactants, and nitrogen is the most sensitive to the surfactant distribution within the organoclays. A spectroscopic study of mechanochemically activated kaolinite with the aid of chemometrics. The phase composition, The phase composition, particle size, surface area, morphology and optical properties were characterized. The XRD results revealed that anatase is dominant and the size of crystal is decreased from An improved surface area of The morphology from SEM also showed a uniform yellow-like powder indicating complete dispersion of nitrogen on the TiO 2 surface.
The prepared sample showed visible-light absorption in the region nm corresponding to band gap energy 2.
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CoFe 2 O 4 nanoparticles grafted multi-walled carbon nanotubes coupled with surfactant-enhanced spectrofluorimetry for determination of ofloxacin in human plasma. An efficient and simple magnetic solid phase extraction based on the use of CoFe 3 O 4 nanoparticles grafted multi-walled carbon nanotubes MWCNTs as adsorbent coupled with surfactant enhanced spectrofluorimetric detection was developed An efficient and simple magnetic solid phase extraction based on the use of CoFe 3 O 4 nanoparticles grafted multi-walled carbon nanotubes MWCNTs as adsorbent coupled with surfactant enhanced spectrofluorimetric detection was developed for determination of ofloxacin from biological samples.
The adsorbent uses the advantages of both magnetic nanoparticles i. The main factors affecting the quantitative recovery including SDS concentration, pH, extraction and desorption times, adsorbent amount, and desorption conditions were investigated in detail.
Under the optimized conditions, the calibration curves were linear over a wide concentration range of ng mL-1 with detection limit LOD of 23 ng mL Finally, the proposed method was successfully applied to the extraction and preconcentration of ofloxacin in human plasma samples.
Biosynthesis of metallic nanoparticles using plant extracts and evaluation of their antibacterial properties. The increasing attention being paid to metallic nano particles MNPs is due to their intensive applications in different areas of science such as medicine, chemistry, agriculture, and biotechnology. The main methods for nanoparticle The main methods for nanoparticle production are chemical and physical approaches that are often costly and potentially harmful to the environment. Since the eco-friendly synthesis of NPs with different chemical compositions, sizes, shapes and controlled dispersity is an important aspect of nano biotechnology and green nanotechnology, biosynthesis of nanoparticles has been proposed as a cost-effective and environmental-friendly alternative to chemical and physical methods.torosuk.com/libraries/2020-02-18/lilud-racing-rivals.php
Plants contain abundant natural compounds such as alkaloids, flavonoids, saponins, steroids, tannins and other nutritional compounds. These natural products are derived from various parts of the plant such as leaves, stems, roots, shoots, flowers, barks, fruits and seeds. Since the plant extract contains various secondary metabolites, it acts as the reducing and stabilizing agent for the bioreduction reaction to synthesize the novel metallic nanoparticles.
This approach has been actively pursued in recent years as an alternative, efficient, inexpensive, and environmentally safe method for producing nanoparticles with specified properties. The present review focuses on the synthesis of MNPs with particular emphasis on biological synthesis using plant extracts and most commonly proposed mechanisms regarding the antibacterial properties of nanoparticles. Nanochem Res, ; 3 1 Effect of sonication time on the synthesis of the CdS nanoparticle based multiwall carbon nanotube — maleic anhydride — 1-octene nanocomposites.
Cadmium chloride and thiourea were used as the raw materials. Electrophysical properties of the polymer nanocomposites obtained using different periods of time for sonication were comparably investigated. The average CdS particle diameter was between 3. UV-Vis spectroscopy revealed that the obtained nanostructures are appropriate base materials for making optical devices. A Maleic anhydride—Octene-1—Vinylbutyl Ether terpolymer was synthesized via the radical terpolymerization method in order to prepare a new matrix for CdS nanocrystal synthesis.
CdS nanocrystals were synthesized through the reaction of It requires communication skills such as the ability to present your work in writing and orally. It requires competencies in the realm of information technology including the ability to find and judge the validity of information and use a variety of hardware and software tools e. Last modified: November 9, UC Santa Cruz.
This is a FIRST CHOICE option only At the nanometer scale 10 raised to the -9th power m , the chemical and physical properties of materials and structures show drastic deviations from those of their atomic or bulk forms. Chemistry Department The focus of this course is to introduce the fundamentals of nanomaterials chemistry to students and to highlight some of the important implication in energy and electronic sciences.
Transferable Skills: Tools for Success It may or may not surprise you that being a university researcher requires a whole host of skills outside of the specific scientific knowledge required of your chosen discipline or specialty.
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