The low temperature specific heat of Sm-Al-Co ternary metallic glasses is investigated and a clear anomaly asso- ciated with the Boson peak is identified. While this anomaly depends slightly on the chemical composition, it has no dependence on external magnetic field. To figure out the mechanism of the Boson peak, we interpret the data within various model frameworks. Unlike earlier work, our study shows that this Boson peak is mainly ascribed to an additional T2 term of the specific heat, which may originate from the quasi-two-dimensional and short-range ordered structure units possibly existing in the metallic glasses.
In this study,acrylic acid(AA) and 4-azidoaniline were used to modify poly(N-isopropylacrylamide)(NIPAAm) in order to fabricate temperature-responsive surface for corneal epithelia cell adhesion and detachment.First,NIPAAm was copolymerized with acrylic acid.Then,the copolymer was coupled with azidoaniline to synthesize AzPhPIA,derivative of p(NIPAAm-co-AA),which possesses both thermo-and photo-sensitivities.Second,the synthesized copolymer was characterized by high performance liquid chromatography(HPLC),Fourier transform infrared(FTIR) and a CHN analyzer.The thermo-sensitivity was characterized by temperature reducing experiment,contact angle measurement and low critical solution temperature(LCST) testing.Third,the derivatized copolymer was immobilized by photolithography on a polystyrene plate,and then the surface characterization of AzPhPIA-coated polystyrene plate(PSt) was measured by electron spectroscopy for chemical analysis(ESCA).The thermo-sensitivity and cytocompatibility of the AzPhPIA-coated PSt were investigated by corneal epithelial cells culture.The results revealed that the AzPhPIA-coated PSt exhibited good cytocompatibility and cell detachability when temperature decreased.
Yanqing GuanZhibin LiXin WangXiaoli NiAini YangJunming Liu
