Colloidal chemistry

wear-resistant and non-oxidant, functional films and develop novel composites especially bio-ceramics to form durable structures for orthopaedic applications via fabrication (Boccaccini et al., 2010). EPD also helps to stabilize nanosized particles in colloidal dispersions onto the surface of an electrode by electrostatic mechanisms (Cao, 2004). Advantages of EPD technique are short formation time, easy to set up, less restriction on the

4. NEED FOR STABILISATION Although the small size of nanocrystals leads to several advantages, but at the same time, it can lead to stability concerns as well. Theoretically, if we increase the drug surface area, it leads to an increase in Gibbs free energy. The system tries to reverse this increase by agglomeration/aggregation, ultimately leading to increased particle size and reduced stability. Principally, the literature describes three mechanisms for aggregation-prekinetic aggregation, differential

methods that use to measure the contact angle of particles at fluid interface. The methods includes Gel trapping technique, Freeze Fracture Shadow Casting (FreSCa), ellipsometry, the excluded area method, Atomic Force Microscopy (AFM) coupled to a colloidal probe, drop shape techniques, and Contact angle evaluation from the collapse pressure of surface pressure-area isotherms. Keywords: contact angle, fluid interface, nanoparticle, microparticle   Introduction Particles at fluid interfaces are very

A nanoparticle is the most basic component in the construction of a nanostructure. In general, the size of a nanoparticle spans the range between 1 and 100 nm. The properties of many conventional materials change when formed from nanoparticles. This is typically because nanoparticles have a greater surface area per weight than larger particles which causes them to be more reactive than other molecules. Self-assembly refers to the process by which nanoparticles or other distinct components spontaneously

Monodisperse sub-200nm polystyrene nanoparticles were synthesized by a facile one-step emulsion polymerization technology using sodium dodecyl sulfonate (SDS) and 2, 2′-azobis (2-methylpropionamide) dihydrochloride (AIBA) as the surfactant and initiator, respectively. The in situ neutralization between negatively charged surfactant SDS and positively charged AIBA was used to control the primary particle (or swollen micelle) volume and the extent of the particle coagulation. As the oligomeric radicals

Raman spectroscopy (RS) as a powerful analytical method have widely been employed in characterization of different kinds of chemical species. Discovery of RS dates back to previous century which first proposed by C.V. Raman and his colleague K.S. Krishnan. This scattering technique involves electromagnetic interaction of an incident monochromatic laser beam with molecules of a matter. Each of different vibrational, rotational and other modes of molecular motions in target molecule can alter both

I have applied to the position through the website of the University of Texas at Dallas as well. Fueled by the revolutionary changes brought by nanomaterials in today’s world, especially in dye-sensitized solar cells, I joined the Department of Chemistry to do research on nanotechnology while preparing to take a Master’s degree in Physics from the same university with a solid foundation in materials science, basic electronics, advanced device electronics, quantum physics, and computational physics

CHAPTER 2 EXPERIMENTAL TECHNIQUES FOR THE SYNTHESIS AND CHARACTERIZATION OF NANOMATERIALS. In order to explore novel physical properties and phenomena and realize potential applications of nanostructures and nanomaterials, the ability to fabricate and process nanomaterials and nanostructures is the first corner stone in nanotechnology. There exist a number of methods to synthesize the nanomaterials, which are categorized in two techniques “top down and bottom up”. Solid state route, ball milling

for the Quantum Dots Lab Sara Lyons, Aleye Momodu, and Sam Winslow Goal: Synthesize Cadmium Selenide (CdSe) Quantum Dot Crystals using Cadmium Oxide (CdO) and Selenium (Se) dissolved in Triphenylphosphine solution. The product created will be a colloidal solution, bound to the exterior of the crystal lattice and it remains soluble in the octadecene (Boatman & Nordell). Along with this the product will most likely vary in color as well due to the changes in wavelength, energy and transitions, that

the environment of the modern world. The sheer range of applications where chemistry is involved inspires me to contribute, while learning, unlocking why everything behaves the way it does. With the hydrogen fusion project in construction and the recent use of hydraulic fracturing which has caused environmental and social dispute, I chose to undertake the extended project qualification related to this, energy, as chemistry leads these