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734143 
Journal Article 
Antiplatelet and thermally responsive poly(N-isopropylacrylamide) surface with nanoscale topography 
Chen, L; Liu, M; Bai, H; Chen, P; Xia, F; Han, D; Jiang, L 
2009 
Yes 
Journal of the American Chemical Society
ISSN: 0002-7863
EISSN: 1520-5126 
J Am Chem Soc. 
131 
30 
10467-10472 
English 
19722623 
WOS:000268644400041 
Nanoscale topography was constructed on a thermally responsive poly(N-isopropylacrylamide) (PNIPAAm) surface by grafting the polymer from silicon nanowire arrays via surface-initiated atom transfer radical polymerization. The as-prepared surface showed largely reduced platelet adhesion in vitro both below and above the lower critical solution temperature (LCST) of PNIPAAm ( approximately 32 degrees C), while a smooth PNIPAAm surface exhibited antiadhesion to platelets only below the LCST. Contact angle and adhesive force measurements on oil droplets (1,2-dichloroethane) in water demonstrated that the nanoscale topography kept a relatively high ratio of water content on the as-prepared surface and played a key role in largely reducing the adhesion of platelets; however, this effect did not exist on the smooth PNIPAAm surface. The results can be used to extend the applications of PNIPAAm in the fields of biomaterials and biomedicine under human physiological temperature and provide a new strategy for fabricating other blood-compatible materials. 
Acrylamides/chemistry/metabolism/pharmacology; Acrylic Resins; Animals; Blood Platelets/metabolism; Nanowires/chemistry; Platelet Adhesiveness/drug effects; Platelet Aggregation Inhibitors/chemistry/metabolism/pharmacology; Polymers/chemistry/metabolism/pharmacology; Silicon/chemistry; Surface Properties; Temperature; 25189-55-3; Z4152N8IUI