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- W2077109739 abstract "Amorphous nifedipine (NFD), which has a smooth surface immediately after preparation, was shown to have structures resembling clusters of curling and branching fibers approximately 1 μm wide by atomic force microscopy (AFM) after storage at 25°C. The size of the cluster-like structures increased with storage over time, implying crystal growth. The average elongation rate of the fibers determined by AFM at ambient room temperature was 1.1 × 10(-9) m/s, and this agreed well with the crystal growth rate of 1.6 × 10(-9) m/s determined by polarized light microscopy. The crystal growth rate of NFD in solid dispersions with 5% polyethylene glycol (PEG) was found to be 5.0 × 10(-8) m/s by AFM. Although this value was approximately the same as that obtained by polarized light microscopy, three-dimensional information obtained by AFM for the crystallization of NFD in a solid dispersion with PEG revealed that the changes in topography were not a consequence of surface crystal growth, but rather attributable to the growth of crystals formed in the amorphous bulk. For solid dispersions with α,β-poly(N-5-hydroxypentyl)-l-aspartamide, acceleration of NFD crystallization by tapping with an AFM probe was observed. The present study has demonstrated the feasibility and application of AFM for interpretation of surface crystallization data." @default.
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- W2077109739 date "2011-10-01" @default.
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- W2077109739 title "Feasibility of atomic force microscopy for determining crystal growth rates of nifedipine at the surface of amorphous solids with and without polymers" @default.
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- W2077109739 doi "https://doi.org/10.1002/jps.22603" @default.
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