Self-assembly of nanosheets by organometallic homopolymer PFpC3P Dapeng Liu

Outline Introduction Preparation of nanosheets nanostructures Characterization of nanosheets nanostructures Temperature-induced morphology transition Summary

Homopolymer PFpC3P aggregates into vesicles in the THF/H2O Introduction Homopolymer PFpC3P aggregates into vesicles in the THF/H2O

Preparation of nanosheet nanostructures Initial polymer concentration= 1mg/ml Volume=1 ml DMSO Adding 9 ml water Colloid Briefly shaking Homopolymer PFpC3P aggregates in the DMSO/H2O

Characterization of nanosheet nanostructures-TEM TEM images distinctly show that nanosheet nanostructures are formed

Characterization of nanosheet nanostructures-AFM Dipping method to prepare the sample Phase contrast mode Height mode Corresponding height profile along the scan lines 5.68 nm Nanosheet nanostructures ( the height of nanostructure 3.3 nm) are found in the AFM images

Temperature-induced morphology transition Initial polymer concentration= 1mg/ml Volume=1 ml DMSO(40 ℃) Adding 9 ml water (40 ℃) Colloid Briefly shaking The formation of a vesicle having the ability to change its shape in response to external stimuli is considered to be an important step in the transition from inanimate organic compounds toward cellular life. Slight indentations.78 (b) Stomatocytes.79 (c) Fully collapsed “kippah” structure; kippah is a Hebrew word for both dome and the traditional skullcap Vesicles (Spherical and Fully Collapsed) are formed at higher temperature (40 ℃) .

Summary When DMSO is used as cosolvent, nanosheets nanostructure were formed at room temperature and characterized by TEM and AFM 2. The vesicle could be also witnessed by increasing the temperature in DMSO cosolvent system which was characterized by TEM Future work More higher temperature experiments (60 ℃， 80 ℃） would be tried to find if more different morphologies are discovered. Investigate the possible reason for the temperature-induced self-assembly.

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