Influence of Pulsed Electromagnetic Fields on Positional and Orientational Ordering in Aqueous Solutions of Cetyltrimethylammonium Bromide (CTAB)

Abstract

Изучено влияние импульсов электромагнитного поля на позиционный порядок ассоциатов (мицелл) в водных растворах цетилтриметиламмония бромистого (CTAB) в концентрационном диапазоне 0,14 ÷ 54,88  10-3 моль/л. Для исследования их позиционного порядка впервые использован метод газоразрядной визуализации (ГРВ), обеспечивающий получение стереографических проекций картин эмиссии электронов из раствора. Полученные картины газоразрядного свечения растворов позволили установить наличие плоскостей с наиболее плотной упаковкой мицелл, их пространственную ориентацию и, как следствие, класс симметрии структуры, формируемой в растворе. Изучена последовательность структурных превращений в растворе после воздействия импульсов магнитного поля при различных концентрациях CTAB. Ключевые слова: цетилтриметиламмоний бромистый, газоразрядное свечение, эмиссия электронов, позиционный порядок, мицеллы.

Possible Use of Low-Energy Electrons for Structure Studying of Dilute Solutions of Surface-Active Substances

“…These changes are linked to the change of the energy of electrons passing through solution drops, the number and position of the facilitated movement channels. The table shows the average energy of electrons transmitted through a drop depending in the concentration of CTAB in the solution and the type of self-orientation of molecular bindings in the corresponding concentration regions [8,9]. The concentration is a ratio of the areas and intensities of the maxima.…”

“…Therefore, the features of the channels of facilitated electron transport through solutions, as well as the interaction of electrons with molecular bindings, and their ensembles participating in the channels' formation, can be defined by the angular location of the emission coefficient's maxima, their width, shape, and number of streamers [7,8].…”

“…The maxima in the angular dependence of electrons, channeled through a solution with a CTAB concentration of 2 ÷ 5 mM, have notably the same intensity and are located at the same distance from each other. The ordinate shows the intensity in relative units on a linear scale too ≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡ This is based on the data [8], showing that micelles are spherical and their short-range order matches one of the polymorphic modifications of the cubic or hexagonal package. The maxima of the angular distribution of electrons expand (Fig.…”

“…The causes of such changes can be the changes in the molecular bindings' (associates) positional order, as well as the changes of their interaction with moving electrons. Based on the data on the studied CTAB concentra-tion range [8], its molecular bindings create spherical or cylindrical micelles with various spatial orientation. The maxima in the angular dependence of electrons, channeled through a solution with a CTAB concentration of 2 ÷ 5 mM, have notably the same intensity and are located at the same distance from each other.…”

“…Among external factors, we especially note the effect of weak electric or magnetic fields. For weak pulsed magnetic fields, such an effect has been studied in some detail for solids -see, for example, [4][5][6] and, in part, for liquids [7,8], that are the subject of this study.…”