94231-28-4Relevant academic research and scientific papers
Micellization properties of cationic gemini surfactants in aqueous solution
?udzik,Piekarski,Kubalczyk,Wasiak
, p. 29 - 35 (2013)
The main goal of this work was to investigate the self-assembly process for water solutions of two gemini surfactants, which differ in spacer chain length, at wide range of temperatures. For this reason the aqueous solutions of hexylene-1,6-bis(dimethyl-octylammonium bromide) and dodecylene-1,12- bis(dimethyloctylammonium bromide) have been examined by the calorimetric (DSC) and densimetric methods within the 293-323 K and 288-323 K temperature range, respectively. The analysis of cp values obtained for the examined systems allowed to propose an alternative way to estimate the region where micellization process can occur. The observed temperature dependence of the c.m.c. for surfactants investigated shows a typical shape for ionic gemini surfactants. This behavior was explained as a resultant of two competing effect: decrease in the hydrophilic properties of the surfactant molecule and decrease in the hydrophobic hydration of the alkyl chain along with the temperature increase. The enthalpy of micellization ΔHmic and other thermodynamics parameters associated with the micellization process: ΔGmic, ΔSmic and ΔCp mic were calculated on the base of the pseudo-phase separation model. As expected, more exothermic enthalpies of micellization are observed with increasing temperature for both the surfactants investigated in this work.
Synthesis and Characterization of Double-Salt Herbicidal Ionic Liquids Comprising both 4-Chloro-2-methylphenoxyacetate and trans-Cinnamate Anions
Szymaniak, Daria,Ma?kowiak, Adam,Ciarka, Kamil,Praczyk, Tadeusz,Marcinkowska, Katarzyna,Pernak, Juliusz
, p. 2281 - 2289 (2020/10/02)
The synthesis and characteristics are presented of novel double-salt herbicidal ionic liquids (DSHILs) that contain 4-chloro-2-methylphenoxyacetate and trans-cinnamate anions. In the designed synthesis, an anion of natural origin and a herbicidal anion were combined with an amphiphilic bisammonium cation to obtain new DSHILs with high herbicidal activity while high biocompatibility is maintained. The NMR and HRMS spectral analysis confirmed that the target structures were formed. Furthermore, HPLC analyses indicated that, as assumed, both anions were present in equimolar amounts. Experiments regarding the herbicidal effectiveness confirmed that the synthesized DSHILs exhibited high biological activity. The solutions of DSHILs applied during greenhouse studies were characterized by a low contact angle (approx. 55–67°) and surface tension (approx. 32–35 mN m?1), which facilitated the contact of the active substance with the plant surface and penetration of the herbicide into the plant tissues.
