Properties of the surface of a porous polymer modified with 5-fluorouracil, according to data of gas chromatography

Gus’kov, V. Yu.; Gainullina, Yu. Yu.; Ivanov, S. P.; Kudasheva, F. Kh.

doi:10.1134/s0036024414060144

Cited by 10 publications

(3 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Unlike in 6-methyluracil, cavities in 5-fluorouracil are formed even if 1% of the modifier is applied [29]. However, when a greater amount of 5-fluorouracil is applied to the surface of Dowex L-285, a decrease in the dispersive surface free energy was observed.…”

Section: Resultsmentioning

confidence: 95%

“…From the theoretical point of view, when any modifiers are applied to porous adsorbents, the dispersive interactions should be weakened since the modifier is adsorbed on the most active centers of the surface, thereby blocking them [42] (we will call this the first factor). However, in the case of the formation of a 2D-supramolecular network with cavities, the latter give an additional contribution to the dispersive surface free energy [29,32] (we will call this the second factor). Therefore, the data of Table 1 show a multidirectional change in γs d , depending on the prevalence of one of these factors.…”

Section: Resultsmentioning

confidence: 99%

“…Differences in the structure of supramolecular ensembles should also affect the ability of the surface covered by a layer of such a structure to participate in disperse interactions. Previously we established a relationship between the structure of supramolecular ensembles and the variation in the heat and entropy of adsorption [29][30][31][32]. It was shown that the size of the cavity of the supramolecular structure directly affects the thermodynamic characteristics of adsorption, while the polarity of the cavity determins the polarity of the resulting adsorbent surface.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Dispersive surface free energy of adsorbents modified by supramolecular structures of heterocyclic compounds

Guskov,

Gainullina,

Gabdulmanova

et al. 2024

Chim.Tech.Acta

View full text Add to dashboard Cite

In the present work, the dispersive surface free energy was calculated by Dorris-Gray method for 30 samples of adsorbents modified with chiral supramolecular structures of uracil, 6-methyluracil, 5-hydroxy-6-methyluracil, 5-fluorouracil, thymine, melamine, cyanuric and barbirutic acids, and perylene-3,4,9,10-tetracarboxylic dianhydride. It was shown that the homologous series of n-alkanes is better suited for measuring dispersive surface free energy than the homologous series of alcohols. It was established that the classical Dorris-Gray method does not allow obtaining well interpretable data for the objects studied. This is due to a noticeable effect that inductive interactions of a polar surface as an inductor with nonpolar alkane molecules have on the calculated values. We suggested to modify the Dorris-Gray method, making it possible to obtain data on the dispersive component of the free energy of adsorption. It was shown that the changes in dispersive surface free energy as a result of the modification correlate well with data on the structure and properties of supramolecular ensembles of the modifiers used. The results obtained can be used to predict the enantioselectivity of chiral adsorbents.

show abstract

Section: Resultsmentioning

confidence: 95%