Direct measurement of interparticle forces by the optical trapping technique

Tadao Sugimoto, Tetsuya Takahashi, Hiroyuki Itoh, Shun Ichi Sato, Atsushi Muramatsu

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


The intrinsic interactive forces between two free colloidal particles suspended in aqueous solutions have been measured as a function of the separation by applying the optical trapping technique to a monodispersed polystyrene latex of a mean diameter 2.13 μm. For this purpose, specific technology for the precise measurement of the surface-to-surface separation and force strength has been developed. The results were in excellent agreement with the prediction of the DLVO theory in a variety of electrolyte concentrations.

Original languageEnglish
Pages (from-to)5528-5530
Number of pages3
Issue number21
Publication statusPublished - 1997 Oct 15


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