Differences in Viscoelasticity of Ophthalmic Polymer Solution after Sterilization

Viscoelasticity of two-layer vesicles in solution.

The dynamic shape relaxation of the two-layer vesicle is calculated. In addition to the undulation relaxation where the two bilayers move in the same direction, the squeezing mode appears when the gap between the two bilayers is small. At a large gap, the inner vesicle relaxes much faster, whereas the slow mode is mainly due to the outer-layer relaxation. We have calculated the viscoelasticity ...

Trimethoprim-polymyxin ophthalmic solution versus chloramphenicol ophthalmic solution in the treatment of bacterial conjunctivitis.

Forty patients with a diagnosis of presumptive bacterial conjunctivitis were treated with either trimethoprim-polymyxin or chloramphenicol ophthalmic solutions in a randomized, double-blind trial. No significant differences could be demonstrated between the results of 7-days' treatment with the two preparations and both solutions were found to be effective in improving the signs and symptoms of...

Viscoelasticity of Depletion-Induced Gels in Emulsion-Polymer Systems

Using rheometry and light scattering, we have studied the viscoelasticity of gels formed by the kinetically arrested phase separation in an emulsion-polymer mixture; to prevent the gels from collapsing under their own weight, we have used an isopycnic solvent. At constant osmotic pressure (set by the polymer concentration) and droplet volume fractionsφ well above the gelation transition, we fin...

Viscoelasticity in Nanoscale Friction on Thin Polymer Films

Quantifying primary loops in polymer gels by linear viscoelasticity.

In polymeric gels, basically two species of cross-links exist: those contributing to the network and those that don’t. Zhou et al. (1) suggested network disassembly spectrometry to determine the content of loops— the simplest kind of network defects in gels. Although cross-links contributing to the network hold the gel together and are thus desirable, the noncontributing links (e.g., the loops ...