| Summary: | 碩士 === 國立成功大學 === 化學工程學系 === 86 === Abstract In this study, mixed DPPC/long-chain alcohol
Langmuir-Blodgett (LB) films were deposited at different surface
pressures, and the contact angles of water on the LB films were
measured by using a dynamic contact angle analyzer. The goal is
to investigate the effects of monolayer composition at the air/
water interface and deposited surface pressure on the
wettability of the LB film surface. The results show that
when the LB film is deposited at the surface pressure of 25 mN/
m, the monolayer composition has no effects on the advancing
contact angle of water on the LB film. However, at the deposited
surface pressure of 35 mN/m, the advancing contact angle
increases with the mole fraction of DPPC, except for the pure
DPPC LB film. Moreover, based on the FTIR analysis, one can
find that there is no relationship between the molecular
orientation and the wettability of the LB film. We also
prepare the LB films of long-chain alcohol and find that the
wettability of the LB film is not affected by the chain length,
but increases with deposited surface pressure. When the LB
films are dried under different conditions, the advancing
contact angle of water on the LB film surfaces can change
significantly from 30o to 112 o.
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