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    "description": "A sparingly soluble model drug, phenytoin (5,5-diphenyl-hydantoin, denoted as PT), was incorporated during or after hydrolysis and polycondensation of tetra orthoethyl silicate (TEOS) to obtain silica\u2013drug hybrids. We also compare the hybrids obtained by sol\u2013gel process with those obtained by simple adsorption on nonporous silica particles. The initial rate of dissolution in water increases by a factor of 40 with respect to the intact PT by aging silica before drug addition. The IR results show that \u03bdC=O in the position 2 of PT and \u03bdN\u2013H shift toward the higher wavenumber, showing that intermolecular hydrogen bonds between C=O and N\u2013H are loosened or broken to form new hydrogen bonds between C=O in PT and Si\u2013OH in silica. The dissolution rate of PT is determined by the degree of the breakage of hydrogen bonds between PT molecules and the intensity of the interaction between silica and PT.", 
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      "intermolecular hydrogen bonds", 
      "sol-gel process", 
      "soluble model drug", 
      "dissolution of phenytoin", 
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      "PT molecules", 
      "simple adsorption", 
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