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In this paper, NiCrAlY coating was deposited on TC4 titanium alloy using arc ion plating, and the stability of NiCrAlY coating/TC4 substrate system under pure thermal exposure was analyzed in a wide temperature range. During the thermal exposure, β → γ′ → γ phase transformation takes place in the NiCrAlY coating. The NiCrAlY coating phases totally decompose above the allotropic transformation temperature...
The degradation pathway of a cross-linked polyethyleneimine (c-PEI) suitable as a gene carrier was studied at different pH values by real-time 1 H NMR and diffusion-weighted 1 H NMR spectroscopy. The c-PEI was synthesized by cross-linking PEI segments with 2,4-pentanediol diacrylate (PDDA). The experimental results show that under basic, neutral and acidic conditions, the degradation...
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