The surface anchoring dependence of the dielectric constant of an FLC material showing electroclinic effect

Yang, Yingbao; Bang, Tae-Hwan; Mochizuki, Ayako; Kobayashi, Shunsuke

doi:10.1080/00150199108217615

Cited by 10 publications

(1 citation statement)

References 7 publications

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“…The relative dielectric constant, which is a parameter of the dipole moment, is 2.01 and 2.36 for the ester and the amide, respectively, but 2.66 for the salt-type. The higher the dielectric constant, the more strongly the lubricant seems to adsorb on the medium [88].…”

Section: Heat Of the Preferential Adsorptionmentioning

confidence: 99%

Tribochemistry of Ionic Liquid Lubricant on Magnetic Media

Kondo¹

2012

Advances in Tribology

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The newly synthesized perfluoropolyether (PFPE) ionic liquid whose terminal group is an ammonium salt with a carboxylic acid has better frictional properties when compared to the conventional PFPEs. Stick-slip motion was not observed even for the smooth surface for the modified PFPE tape. The friction is almost independent of the PFPE structure, but depends on the amine structures. The ammonium salt being tightly anchored to the rubbing surface covers uniformly, which leads to better lubricity. The higher dispersive interaction of the hydrophobic group of the amine is endowed with a compensating friction reduction. Steric hindrance of the hydrophilic group causes a high friction. Based on these findings, a saturated long chain ammonium salt is the best selection. Moreover, the modified PFPEs are dissolved in alcohol and hexane, which makes practical use convenient without any environmental problems. These ionic lubricants invented around 1987 have been used for magnetic tapes for about a quarter century because of their good lubricity and are reviewed in this paper.

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Section: Heat Of the Preferential Adsorptionmentioning

confidence: 99%