************第３７回尾張コンプレックスセミナー*************

Title　：　Development of Functionalized Lubrication Surfaces by 
           Patterning of Nanometer-Thick Liquid Films

Speaker ：　Hedong ZHANG

Date　：　Thu. May 19th, 1:30 pm (Almost one hour)

Abstract：
To realize high recording density hard disk drives (HDDs), head-
disk spacing must be further reduced, and the thickness of liquid 
lubricant films coated on the disk surfaces has also been decreased 
to 1-2 nm. Consequently, the function of such thin lubricant films 
is an important factor in determining the performance of HDDs. 
In contrast to general lubrication with thick lubricant films, nanometer
-thick lubricant films are required to firmly adhere to the disk 
surface so that no film rupture occurs when sliding during contact 
(retention function); they are also required to spread quickly to 
replenish depleted areas if film rupture does occur (replenishment 
function). To develop functionalized lubrication surfaces fulfilling both 
the conflicting functions, I proposed a method to optimally pattern 
the nanometer-thick lubricant films into individual regions with 
different functions by locally modifying the lubricant/solid interactions. 
I have also investigated the validity of the method with both molecular 
simulations and experiments. The results obtained so far and future 
outlook will be presented in this talk.
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