Colloidal suspensions usually consist of colloidal particles of size 1 nm to 1 μm which are surrounded by a solvent, typically water. In these systems the kinetic energy of the colloids at room temperature is about the strength of their interaction energy. Hence, these systems or materials are considered as soft and deformable and known as “soft matter”. Molecular dynamics (MD) simulation of su...

We demonstrate that the microstructural and mechanical properties of bacterial biofilms can be created through colloidal self-assembly of cells and polymers, and thereby link the complex material properties of biofilms to well understood colloidal and polymeric behaviors. This finding is applied to soften and disassemble staphylococcal biofilms through pH changes. Bacterial biofilms are viscoel...

Colloidal nanocrystals are a technologically important class of nanostructures whose phase change properties have been largely unexplored. Here we report on the melting behavior of In, Sn, and Bi nanocrystals dispersed in a polymer matrix. This polymer matrix prevents the nanocrystals from coalescing with one another and enables previously unaccessed observations on the melting behavior of coll...

In many aspects, colloidal particles suspended in a liquid behave like large idealized atoms that exhibit liquid, glass, and crystal phases similar to those observed in atomic systems. Phase transitions in colloidal systems have been intensively studied over the last decade not only because of the theoretical interest for addressing fundamental questions about the nature of liquids, crystals, a...

Understanding and, ultimately, controlling the properties of amorphous materials is one of the key goals of material science. Among the different amorphous structures, a very important role is played by colloidal gels. It has been only recently understood that colloidal gels are the result of the interplay between phase separation and arrest. When short-ranged attractive colloids are quenched i...

Abstract Synthesis of silver nanoparticles was successfully synthesized by a chemical reduction method using nitrate (AgNO 3 ) as precursor and sodium borohydride (NaBH 4 reducing agent. The optical properties were studied based on their surface plasmon resonance (SPR) phenomenon UV-Visible spectrophotometry. absorbance spectra colloidal show the peak at wavelength range 380 nm to 450 nm. Collo...

background: metal nanoparticles have been recently applied in dentistry because of their antibacterial properties. this study aimed to evaluate antibacterial effects of colloidal solutions containing zinc oxide (zno), copper oxide (cuo), titanium dioxide (tio2) and silver (ag) nanoparticles on streptococcus mutans and streptococcus sangius and compare the results with those of chlorhexidine and...

INTRODUCTION The development of conducting colloids stemmed from applications driven needs for proeessable conducting polymers. Because conducting polymers are aggregated in nature, due to their conjugated backbones, the preparation of colloidal systems of these aggregates is an attractive approach to by-passlng the intractability problem. The reason for focussing on the two particular colloida...

Colloidal suspensions of anisotropic nanoparticles can spontaneously self-organize in liquid-crystalline phases beyond some concentration threshold. These phases often respond to electric and magnetic fields. At lower concentrations, usual isotropic liquids are observed but they can display very strong Kerr and Cotton-Mouton effects (i.e., field-induced particle orientation). For many examples ...