Fabrication of phosphonic acid films on nitinol nanoparticles by dynamic covalent assembly

THIN SOLID FILMS

卷:642

Article

Quinones, Rosalynn¹  Garretson, Samantha¹  Behnke, Grayce¹  Fagan, Jonathan W.²  Mueller, Karl T.^2,3  Agarwal, Sushant⁴  Gupta, Rakesh K.⁴ 

[1] Marshall Univ, Dept Chem, Huntington, WV 25755 USA

[2] Penn State Univ, Dept Chem, State Coll, PA 16802 USA

[3] Pacific Northwest Natl Lab, Phys & Computat Sci Directorate, Richland, WA 99352 USA

[4] West Virginia Univ, Dept Chem & Biomed Engn, Morgantown, WV 26506 USA

关键词: Self-assembly films;    Nitinol;    Phosphonic acid;    Nanoparticles;    Zeta potential;    Solid-state nuclear magnetic resonance;   

DOI  :  10.1016/j.tsf.2017.09.048

来源: Elsevier

【 摘 要 】

Nitinol (NiTi) nanoparticles are a valuable metal alloy due to many unique properties that allow for medical applications. NiTi nanoparticles have the potential to form nanofluids, which can advance the thermal conductivity of fluids by controlling the surface functionalization through chemical attachment of organic acids to the surface to form self-assembled alkylphosphonate films. In this study, phosphonic functional head groups such as 16-phosphonohexadecanoic acid, octadecylphosphonic acid, and 12-aminododecylphosphonic acid were used to form an ordered and strongly chemically bounded film on the NiTi nanopowder. The surface of the NiTi nanoparticles was modified in order to tailor the chemical and physical properties to the desired application. The modified NiTi nanoparticles were characterized using infrared spectroscopy, powder X-ray diffraction, X-ray photoelectron spectroscopy, and P-31 solid-state nuclear magnetic resonance. The interfacial bonding was identified by spectroscopic data suggesting the phosphonic head group adsorbs in a mixed bidentate/mono-dentate binding motif on the NiTi nanoparticles. Dynamic light scattering and scanning electron microscopy-energy dispersive X-ray spectroscopy revealed the particle sizes. Differential scanning calorimetry was used to examine the phase transitions. Zeta potential determination as a function of pH was examined to investigate the surface properties of charged nanoparticles. The influence of environmental stability of the surface modifications was also as assessed.

【 授权许可】

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