The phase behavior of binary mixtures of non-crystallizable racemic poly (d, l-lactic acid) (PDLLA) and the mosquito-repellent/drug N,N-diethyl-3-methylbenzamide (DEET) was analyzed with respect to the effect of the polymer molar mass on the liquid-liquid (L–L) phase separation characteristics, by cloud-point measurements and differential scanning calorimetry. The PDLLA/DEET system shows a subambient upper critical solution temperature (UCST), with the critical temperature decreasing and critical polymer concentration increasing with decreasing molar mass of PDLLA. The obtained L–L phase separation curves were used to estimate the temperature-dependence of the interaction parameter, confirming that the enhanced miscibility of the system components in case of low molar mass PDLLA is due to increased entropy of mixing.
Khetib, Yacine; Abo-Dief, Hala M.; Alanazi, Abdullah K.; Saleem, Hussein A.; Sajadi, S. Mohammad; Sharifpur, Mohsen(Frontiers Media, 2021-10-18)
In this article, alumina/water nanofluid (NF) flow in a heatsink (H-S) with wavy
microchannels (W-MCs) is simulated. The H-S is made of aluminum containing four
similar parts. Each part has an inlet and outlet. Constant ...
Liles, David C.; De Villiers, J.P.R. (Johan); Kahlenberg, Volker(Springer, 2016-02)
Crystals of a silico-ferrite of calcium and aluminium (SFCA) and an Al-free SFC were
prepared from the melt by slow cooling of synthetically prepared mixtures and examined by
single-crystal diffraction methods. Both ...
Wild ginger, Siphonochilus aethiopicus, is a traditional remedy for the treatment of
allergic asthma and other conditions. Preparations include hot infusions of rhizomes
and steaming of the rhizomes and inhalation of the ...