When oil is mixed with light alkanes, asphaltenes can precipitate out of oil solutions in a multistep process that involves the formation of nano and colloidal scale particles, the aggregation of asphaltene colloids, and their eventual sedimentation. Amphiphilic dispersants can greatly affect this process. The mechanism of the dispersant action in colloidal asphaltene suspensions in heptane has...

Over the past decade, formation of monodisperse colloidal nanocrystals with size and shape control has been intensively pursued. This topic is of key importance for elucidating unique size/shape-dependent physiochemical properties and for applications in optoelectronics, sensing, catalysis, crystallization, and mineralization. Currently, a major research direction appears to be shifting to crea...

In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier's archiving and manuscript policies are encouraged to visit: a b s t r a c t a r t i c l e i n f o Recent advances in microfluidic and direct-write assembly of colloidal suspensions ope...

Thermally induced particle flow in a charged colloidal suspension is studied in a fluid-mechanical approach. The force density acting on the charged boundary layer is derived in detail. From Stokes' equation with no-slip boundary conditions at the particle surface, we obtain the particle drift velocity and the thermophoretic transport coefficients. The results are discussed in view of previous ...

We analyze the short-time dynamical behavior of a colloidal suspension in a confined geometry. We analyze the relevant dynamical response of the solvent, and derive the temporal behavior of the velocity autocorrelation function, which exhibits an asymptotic negative algebraic decay. We are able to compare quantitatively with theoretical expressions, and analyze the effects of confinement on the...

The onset of transient Soret-driven convection is investigated experimentally in a colloidal suspension of thermosensitive nanoparticles by the shadowgraph technique and by particle tracking observations. From the shadowgraph images, the concentration profile is reconstructed, giving evidence of a convective motion inside the transient boundary layer. Furthermore, the latency times for the conv...

1. Serum colloidal osmotic pressure was measured in children 'at risk' to kwashiorkor, in other with frank signs of the disease and during recovery. Simultaneous estimations of serum albumin and globulin concentrations and assessments of the extent of oedema were also made. 2. During the development of kwashiorkor, serum colloidal osmotic pressure did not decrease significantly until albumin co...

We report a comprehensive study of laser-initiated, liquid-assisted colloidal (LILAC) lithography, and illustrate its utility in patterning silicon substrates. The method combines single shot laser irradiation (frequency doubled Ti-sapphire laser, 50fs pulse duration, 400nm wavelength) and medium-tuned optical near-field effects around arrays of silica colloidal particles to achieve 3-D surface...

The effects of pH, trypsin, and phospholipase C on the topographic distribution of acidic anionic residues on human erythrocytes was investigated using colloidal iron hydroxide labeling of mounted, fixed ghost membranes. After glutaraldehyde fixation at pH 6.5-7.5, the positively charged colloidal particles were bound to the membranes in small randomly distributed clusters. The clusters of anio...

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 ...