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- W3012596989 abstract "Quantifying molecular surface diffusivity is of broad interest in many different fields of science and technology. In this study, the method of surface grating decay is utilized to investigate the surface diffusion of practical relevant amorphous solid dispersions of indomethacin and the polymeric excipient Soluplus (a polyvinyl caprolactam-polyvinyl acetate-polyethylene glycol graft copolymer) at various polymer concentrations (1–20% w/w). The study confirms that measuring surface diffusivity below the system’s glass transition temperature is possible with a simplified atomic force microscopy setup. Results highlight a striking polymer influence on the surface diffusivity of drug molecules at low polymer concentrations and a turnover point to a polymer dominated diffusion at around three percent (w/w) polymer concentration. The surface diffusion measurements further correlate well with the observed increase in physical stability of the system as measured by X-ray powder diffraction. These findings are of vital interest in both the applied use and fundamental understanding of amorphous solid dispersions." @default.
- W3012596989 created "2020-03-27" @default.
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- W3012596989 date "2020-03-24" @default.
- W3012596989 modified "2023-10-17" @default.
- W3012596989 title "Direct Measurement of Lateral Molecular Diffusivity on the Surface of Supersaturated Amorphous Solid Dispersions by Atomic Force Microscopy" @default.
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- W3012596989 doi "https://doi.org/10.1021/acs.molpharmaceut.0c00176" @default.
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