単鈍せん断流中における脂質二分子膜ベシクルの挙動 : 第2報,Tank-treading運動における内部流動場の解析(流体工学,流体機械)

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Motions of tracer particles enclosed in a tank-treading lipid bilayer vesicle have been observed by phase contrast microscopy. Giant vesicles were swollen from 1,2-dioleoyl-sn-glycero-3-phosphocholine with hydration water containing polysterene particles by the gentle hydration method. Using the simple shear flow apparatus shown in our previous report [Hatakenaka, Takagi and Matsumoto, Tram. JSME, Series B, Vol.74, 530 (2008)], we analyzed motions of particles in a tank-treading vesicle relative to the center of mass of the vesicle. In our observation, the particles move along the ellipsoidal orbits, which are homothetic to the vesicle shape. It is shown that angular velocities of the particles near the membrane change periodically, and agree quantitatively with the experimental result on a motion of a particle adhering to the membrane of a tank-treading vesicle [Kantsler and Steinberg, Phys. Rev. Lett., 95, 258101 (2005)]. It is also shown that the velocity of the inner fluid close to the membrane is not constant along the circumference, and it implies the possibility of a three dimensional flow field of the lipid molecules or an apparent stretching motion of the membrane having hidden surface area due to the thermal fluctuation.
一般社団法人日本機械学会の論文
2008-04-25