Simultaneous determination of interfacial molarities of an alcohol, bromide ion, and water during an alcohol induced microstructural transition: the difference between medium and long chain alcohols

Yao, Kaixin; Sun, Lijie; Ding, Xiaoxuan; Wang, Yuzhao; Liu, Tianze; Liu, Changyao; Tan, Jiajing; Zhao, Li; Xu, Bin; Romsted, Laurence S.

doi:10.1039/d0sm00665c

Cited by 7 publications

(20 citation statements)

References 43 publications

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“…The dediazoniation products corresponded to cinnamyl alcohol (CinOH), phenyl ethanol (PEOH), phenyl methanol (PMOH), and anisyl alcohol (AniOH), which are 16-ArOCin, 16-ArOPE, 16-ArOME, and 16-ArOAni, respectively. method, established by the Romsted group, has been employed to determine the interfacial molarities of weakly basic nucleophiles, such as halide ion, water, carboxylate groups, amide bonds, and alcohols, in surfactant aggregate solutions, and the details of the method can be found in previous references [10][11][12]36,37].…”

Section: Rationale Of the Chemical Trapping (Ct) Methodsmentioning

confidence: 99%

“…The interfacial region between aggregates and bulk water is like a “black box” as it is highly difficult to focus on this specific area using general experimental methods. The CT method, established by the Romsted group, has been employed to determine the interfacial molarities of weakly basic nucleophiles, such as halide ion, water, carboxylate groups, amide bonds, and alcohols, in surfactant aggregate solutions, and the details of the method can be found in previous references [ 10 , 11 , 12 , 36 , 37 ].…”

Section: Rationale Of the Chemical Trapping (Ct) Methodsmentioning

confidence: 99%

“…The fragrance-releasing efficiency is therefore strongly impacted by the interaction between the vesicles and fragrances [ 9 ]. Salts and small organic molecules incorporate themselves into aggregates composed of amphiphiles, which alters their microstructures [ 11 , 12 , 13 , 14 , 15 , 16 ]. The fragrances themselves are also small organic molecules that may induce the microstructural transition of surfactant aggregates.…”

Section: Introductionmentioning

confidence: 99%

“…Short-chain alcohols such as methanol and ethanol usually serve as a cosolvent and tend to break down aggregates [ 29 ]. However, long-chain alcohols, which act as a kind of cosurfactant, tend to decrease the critical micelle concentration (cmc) of the surfactant and induce micelle growth [ 12 , 30 , 31 , 32 , 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

“…Previously, our group [ 12 ] employed the chemical trapping method to probe the interfacial composition changes during an octanol induced CTAB/KBr micelle-to-vesicle transition. We showed that the transition is accompanied by a noticeable rise in interfacial water and alcohol molarities, and a decline in interfacial counterion molarity.…”

Section: Introductionmentioning

confidence: 99%

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Interfacial Composition of Surfactant Aggregates in the Presence of Fragrance: A Chemical Trapping Study

et al. 2022

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In recent years, there has been increasing interest in daily-use chemical products providing a pleasant scent. The added fragrance molecules may induce microstructural transitions of surfactant aggregates, which further affect the physical and chemical properties of the products. Here, the effects of four types of aromatic alcohols (cinnamyl alcohol, phenyl ethanol, phenyl methanol and anisyl alcohol) on cetyltrimethylammonium bromide (CTAB)/KBr aggregates were studied. The combined results from rheology, dynamic light scattering, and transmission electron microscopy measurements showed that cinnamyl alcohol induced significant micellar growth, while increases in micellar growth were less obvious for the other aromatic alcohols. The changes in the interfacial molarities of water, aromatic alcohol, and bromide ions during such transitions were studied using the chemical trapping method. Transitions resulting from added cinnamyl alcohol were accompanied by significant declines in interfacial water and bromide ion molarities, and a rise in interfacial alcohol molarity. The marked decrease in interfacial water molarity was not observed in previous studies of the octanol induced formation of wormlike micelles and vesicles, indicating that a different mechanism was presented in the current system. Nuclear magnetic resonance investigation showed that π–π stacking between cinnamyl alcohols, but not cation–π interactions between alcohols and CTAB headgroups, facilitated the tight packing of alcohol molecules in CTAB aggregates and the repulsion of water from the interfacial region. The current study may provide a theoretical basis for the morphological regulation of surfactant aggregates in the presence of additives.

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