6533b82dfe1ef96bd1291e69
RESEARCH PRODUCT
Confinement-induced polymorphism in acetylsalicylic acid–nanoporous glass composites
A. BarascuDirk EnkeMaciej PtakJ. TrzmielM. KostrzewaR. SzatanikAdam SieradzkiPaulina PeksaPaulina Peksasubject
Materials scienceSpecific heatNanoporous020502 materialsMechanical EngineeringMelting temperature02 engineering and technologydigestive system diseasessymbols.namesakesurgical procedures operativeGlass composites0205 materials engineeringChemical engineeringNanocrystalPolymorphism (materials science)Mechanics of MaterialssymbolsGeneral Materials ScienceRaman spectroscopyPositron annihilationdescription
We report on the experimental observation of confinement-induced new phase appearance in acetylsalicylic acid (ASA)–porous glass (PG) composites. In this study, ASA was embedded in PG host matrices of various pore widths (15–200 nm). The Raman spectra and positron annihilation lifetime measurements exhibit the existence of ASA nanocrystals in the PG matrix. The DSC data revealed that the melting temperature TM and excess specific heat decrease with decreasing the size of embedded ASA nanocrystals. The close inspection of the TM dependence versus diameter of filled pores has shown that the ASA crystallizes in polymorph II in confined matrix. Moreover, it was demonstrated that the ASA spatial confinement results in the appearance of new polymorphic phase in the investigated composites—highly likely form ASA III. Both the changes in ASA melting temperatures due to the volume constraints and the decrease in specific heat may be crucial for the bioavailability of the drug.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-08-30 | Journal of Materials Science |