Author: Paulina Peksa

0000000000719104

AUTHOR

Paulina Peksa

showing 7 related works from this author

Confinement-induced polymorphism in acetylsalicylic acid–nanoporous glass composites

2018

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…

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 annihilationJournal of Materials Science

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Polar metal–formate frameworks templated with 1,2-diaminoethane–water assemblies showing ferromagnetic and ferroelectric properties

2017

A set of five novel formate frameworks templated with assemblies comprising diprotonated 1,2-diaminoethane (DAE) and a water molecule of the formula: [NH3(CH2)2NH3]M2(HCOO)6·H2O, where M = Mg, Mn, Co, Ni, Zn, has been synthesized. Four compounds crystallize in the polar R3 space group and one in the chiral P6322 space group (Ni-analog) at room temperature. The polyammonium–water assemblies, mutually joined by hydrogen bonds, fill the cavities of the frameworks and are disordered in the three latter compounds. Additional disorder is found in the Ni-sample as the DAE2+–H2O couple is placed in a special position on the 63 screw axis. IR spectroscopy provides evidence of proton dynamic disorder…

Materials scienceHydrogen bondGeneral Physics and AstronomyInfrared spectroscopy02 engineering and technology010402 general chemistry021001 nanoscience & nanotechnology01 natural sciencesFerroelectricity0104 chemical sciencesIonPyroelectricitychemistry.chemical_compoundCrystallographychemistryFerromagnetismMoleculeFormatePhysical and Theoretical Chemistry0210 nano-technologyPhysical Chemistry Chemical Physics

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