| 초록 |
Patterned polymer substrates were fabricated and utilized as a template for particle formation. Herein, the poly (styrene-b-ethylene oxide) patterned substrates having ordered cylindrical PEO domains of 20-30 nm as nucleation sites were utilized to control the size of the crystals. The hydrophilic characteristics of the PEO domain can provide the driving force to position hydrophilic particles selectively within the domain. Moreover, the large internal surface area of materials containing nanometer-scale domains can provide an additional effect for controlled crystallization. Under a well-cotrolled condition, glycine were selectively positioned within hydrophilic PEO nanodomains. Additionally nanocrystals grown on nanopatterned surfaces might lead to formation of high energy metastable polymorphs. To study the polymorphic outcome of glycine constrained on substrates, crystals obtained on a patterned substrate and on a bare silicon wafer were characterized by Raman spectrometer and AFM. |
