An aqueous two-phase system formed in single-component solution of α-ketooctanoic acid

Abstract

An aqueous two-phase system can form in the single-component solution of α-ketooctanoic acid without any additives.

Self-Assembly of Palmitic Acid in the Presence of Choline Hydroxide

“…Figure 3(d1) showed that the aggregates in the turbid upper phase were stacked lamellar structures. No large aggregates were observed in the transparent lower phase (Figure 3(d2)), indicating the formation of small micelles [7,13,18] above critical micelle concentration [24], which is consistent with the limpidity of the solution. The existence of micelles was further detected by DLS (Figure S1), showing that micelle aggregates formed in the lower phase with ca.…”

“…Herein, three types of PA species coexist, i.e., non-ionized (neutral acid, RCOOH), ionized (deprotonated carboxylate soap, RCOO − ) species, as well as the "acid-soap" dimers formed through hydrogen bonding between the two species. Similar to most fatty acid systems, it is the dimers that lead to the formation of various bilayer structures [18,51,52]. As R increased, the ionization degree (or relative content of RCOO − ) increased, and the contents of RCOOH decreased.…”

“…Since then, more researchers have started to focus on the self-assembly behavior of saturated or unsaturated fatty acids in aqueous solutions as well as their applications in numerous fields [2][3][4][5][6][7][8][9][10][11]. Generally, fatty acids dispersed in alkaline aqueous solution at a specific temperature self-assemble into various aggregates, including micelles, vesicles, or lamellar phases, and oil droplets, depending on pH [2,3,5,[10][11][12][13][14][15][16][17][18]. Different aggregates impart distinct properties to them, and they are extensively employed in fields such as food [19], medicine [9,20], cosmetics [21], chemical engineering [22,23], and primitive membrane models [8,10].…”

Alkane-Strengthened Viscoelasticity in Micellar Solutions of Surface-Active Ionic Liquids and Their Potential Application in Enhanced Oil Recovery

“…Moreover, the scattering factor ratio (q1/q2) of the red curve in the 8 wt % n -dodecane system was approximately 1:2, indicating the presence of a lamellar micelle microstructure . Additionally, the Maltese cross pattern was also observed through the POM as the characteristic of a typical layered liquid crystal (Figure b) . Both of these findings indicated the existence of lamellar micelles within the system.…”

“…26 Additionally, the Maltese cross pattern was also observed through the POM as the characteristic of a typical layered liquid crystal (Figure 6b). 48 Both of these findings indicated the existence of lamellar micelles within the system.…”