Concentration Dependent Sedimentation of Colloidal Rods
نویسنده
چکیده
. This theoretical prediction is compared to experimental results. In the second part, experiments on fd-virus are described, both in the isotropic and nematic phase. First order in concentration results for this very long and thin (semi-flexible) rod are in agreement with the above theoretical prediction. Sedimentation profiles for the nematic phase show two sedimentation fronts. This result indicates that the nematic phase becomes unstable with the respect to isotropic phase during sedimentation.
منابع مشابه
Polymerization of Silica in Water-Effect of Ultrasonic Waves on Coagulation and Sedimentation
Polymerization rates of silica at various concentrations and pHs have been studied via nephelometry. The ability and potency of ultrasonic radiation on the coagulation process in aqueous samples with and without silica colloidal particles have been extensively investigated. Factors affecting the rate and filtration volume such as silica concentration, time of radiation, temperature, and fre...
متن کاملColloidal dispersion of gold nanorods: Historical background, optical properties, seed-mediated synthesis, shape separation and self-assembly
The color of colloidal dispersions of gold particles in a fluid, typically water, varies from red to blue, depending upon the shape and size of particles. The color and optical properties of gold nanoparticles originate from localized surface plasmons, and are sensitive to their local dielectric environment. Unlike nanospheres, the optical properties, hydrodynamic behavior as well as phase beha...
متن کاملDirect visualization of colloidal rod assembly by confocal microscopy.
The development of model materials and image processing methods to directly visualize and quantify colloidal rod assembly by means of confocal laser scanning microscopy (CLSM) is reported. Monodisperse fluorescent colloidal rods are prepared by the uniaxial extensional deformation of sterically stabilized microspheres at elevated temperatures. The particles are stably dispersed in refractive in...
متن کاملInteractions and Collective Behavior of Attractive Colloidal Rods and Microspheres Grafted with Filamentous Bacteriophage
Interactions and Collective Behavior of Attractive Colloidal Rods and Microspheres Grafted with Filamentous Bacteriophage A dissertation presented to the Faculty of the Graduate School of Arts and Sciences of Brandeis University, Waltham, Massachusetts by Fei Huang Interactions and collective behavior are investigated for two systems of attractive colloidal rods and colloidal stars. Attractive ...
متن کاملSlow vertical deposition of colloidal crystals: a Langmuir-Blodgett process?
For an evaporating colloidal suspension in which the evaporation velocity exceeds the sedimentation velocity, particles will accumulate at the solvent-air interface. If neither diffusion nor convection can disperse this accumulation, it is expected to grow into a colloidal multilayer several microns thick. We observe that the thickness of colloidal crystals vertically deposited from 1 mum diame...
متن کامل