The 2-dimenional microstructure of a ultrathin film of DMPC and PEG-DMPE mixtures has been studied by using Atomic Force Microscope(: AFM). The composition of the binary mixture is a parameter to classify the films in terms of the fractal dimension, volume and mean height, and the characteristic pattern size. Films were prepared with a Langmuir-Blodgett(LB) technique and a spincoating technique. The topographic images show both quasi-circular and finger-like patterns. The 2D Fourier Transform analysis was used to find the characteristic wave vector of the patterns. The results show the ring shape, which indicates the similarity with a spinodal decomposition in a phase separation.
Furthermore, the characteristic size $1/k_m$ was determined from the power spectral density corresponding to the radial part of 2D Fourier Transform of the AFM height profiles.
원자현미경(Atomic Force Microscope: AFM)을 이용하여 DMPC와 PEG-DMPE 혼합 시스템의 ultrathin film이 2차원 평면 위에 형성하는 극미세 구조를 연구하였다. LB(Langmuir-Blodgett)방법과 spincoating방법으로 형성한 film의 topographic images는 quasi-circular and finger-like patterns을 보이며, 2D Fourier Transform의 결과, spinodal decomposition in a phase separation과 유사한 ring shape을 나타낸다.
DMPC와 PEG-DMPE의 비율에 따른 fractal dimension, volume and mean height, characteristic pattern size를 계산하였다. 특히, characteristic size $1/k_m$는 2D Fourier Transform의 radial part에 해당하는 power spectral density로부터 구할 수 있다.
