title: Antiplatelet and thermally responsive poly(N-isopropylacrylamide) surface with nanoscale topography.
abstract: 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.
authors.affiliation: Beijing National Laboratory for Molecular Sciences (BNLMS), Center for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
authors.forename: Li
authors.initials: L
authors.lastname: Chen
authors.forename: Mingjie
authors.initials: M
authors.lastname: Liu
authors.forename: Hao
authors.initials: H
authors.lastname: Bai
authors.forename: Peipei
authors.initials: P
authors.lastname: Chen
authors.forename: Fan
authors.initials: F
authors.lastname: Xia
authors.forename: Dong
authors.initials: D
authors.lastname: Han
authors.forename: Lei
authors.initials: L
authors.lastname: Jiang
mesh_terms: D000178:Acrylamides / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D000180:Acrylic Resins; D000818:Animals; D001792:Blood Platelets / Q000378:metabolism; D008297:Male; D053770:Nanowires / Q000737:chemistry*; D010973:Platelet Adhesiveness / Q000187:drug effects; D010975:Platelet Aggregation Inhibitors / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D011108:Polymers / Q000737:chemistry* / Q000378:metabolism / Q000494:pharmacology*; D051381:Rats; D012825:Silicon / Q000737:chemistry*; D013499:Surface Properties; D013696:Temperature
chemical_list: D000178:Acrylamides; D000180:Acrylic Resins; D010975:Platelet Aggregation Inhibitors; D011108:Polymers; C052970:poly-N-isopropylacrylamide; D012825:Silicon