Electrostatics of optical rectification in metallic particles

Optical forces between metallic particles.

We calculate the optical attractive forces that occur between 30-nm Au or Ag nanocrystals when irradiated at visible wavelengths. These forces show resonances at dipolar plasmon wavelengths, similar to resonances in the near-field electromagnetic intensities. At MW/cm2 intensities, optical forces can be stronger than van der Waals forces and could be used to organize metallic particles. We also...

Optical rectification at semiconductor surfaces.

Persorption of metallic iron particles.

Large, solid, undissolved food particles instantly enter the body from the intestinal lumen. We examined this phenomenon which we called 'persorption'. Such large particles are kneaded between the cells into the subepithelial region through the epithelial cell layer. Transport from the intestinal wall is via the portal system and by means of the chyle (Fig. 1). Starch granules with a diameter r...

Screened electrostatics of charged particles on a water droplet.

We study the electrostatic properties of charged particles trapped at an interface in a water-in-oil microemulsion. The electrostatic potential and the counterion distribution in the water droplet are given in terms of the ratio of the Debye screening length kappa(-1) and the droplet radius R. In the limit R-->infinity we recover the well-known results for a flat interface. Finite-size correcti...

Electrostatics in the Cytoplasmic Pore Produce Intrinsic Inward Rectification in Kir2.1 Channels

Inward rectifier K+ channels are important in regulating membrane excitability in many cell types. The physiological functions of these channels are related to their unique inward rectification, which has been attributed to voltage-dependent block. Here, we show that inward rectification can also be induced by neutral and positively charged residues at site 224 in the internal vestibule of tetr...