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    Wyświetlanie 1-3 z 3
    Tytuł:
    Krytyczne stężenie micelarne i metody jego wyznaczania
    Critical micellar concentration and methods of its determination
    Autorzy:
    Piotrowska-Kirschling, A.
    Drzeżdżon, J.
    Chmurzyński, L.
    Jacewicz, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/172267.pdf
    Data publikacji:
    2018
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    związki powierzchniowo czynne
    surfaktanty
    krytyczne stężenie micelarne
    micele
    surface active compounds
    surfactants
    critical micellar concentration
    micelles
    Opis:
    Surfactants are substances, which have surface activity in aqueous solutions [1–3]. By adsorbing on the surface (boundary of phase separation) of the system, they change the surfactant properties of the liquid. Surfactants consist of a hydrophobic part (non-polar, called “tail”) and a hydrophilic part (polar, called “head”) [1–3]. The overall structure of the surfactant molecule is shown in Figure 1. In aqueous solution after exceeding one critical micellar concentration of the CMC surfatant (Critical Micelle Concentration), the surfactant molecules aggregate to form micelles [1–5]. Knowledge of CMC values and the micelle formation in solution, it determines the properties of surfactants and their subsequent use in the chemical industry. Surfactants are used in the chemical industry, inter alia, for the production of many detergents, cosmetics, paints, dyes, agrochemicals, pharmaceuticals, food or oil [2, 3].
    Źródło:
    Wiadomości Chemiczne; 2018, 72, 11-12; 815-828
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Współczesne zastosowania związków powierzchniowo czynnych
    Modern applications of surface active agents
    Autorzy:
    Dywicki, Paweł
    Grabowska, Ola
    Chmurzyński, Lech
    Powiązania:
    https://bibliotekanauki.pl/articles/172143.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    związki powierzchniowo czynne
    rolnictwo
    przemysł spożywczy
    przemysł farmaceutyczny
    biosurfaktanty
    surface active agents
    agriculture
    food industry
    pharmacy industry
    biosurfactants
    Opis:
    Surfactants have been known to mankind since the dawn of time. They have been used primarily as washing and cleaning agents. However, today they are used much more often in many fields of industry. This work focuses on two areas of surfactants use, the agriculture and the food industry due to the direct relationship between these two issues. In agriculture, surfactants play a number of important roles. One of the problems of modem agriculture is the low efficiency of spraying, associated with the low absorption of liquid utility for plants. This problem is solved by surfactants, as demonstrated by the example of glyphosate and the organosilicon compound Silwet® L-77. Nowadays, substitutes for conventional surfactants are being sought. Compounds produced by microorganisms are under great interest of scientists. It has been shown that they are characterized by the lower toxicity as well as high biodegradability, while maintaining the characteristics and properties of synthetic compounds. Directly related to the agriculture, the food industry also often uses surfactants. In the production and processing of food surfactants play the role of such compounds as emulsifiers, stabilizers, additives improving the texture of products and increasing the durability of products. Sorbitan esters, e.g. sorbitan monolaurate, their ethoxylated derivatives, e.g. Polysorbate 20, as well as sucrose esters, e.g. sucrose monostearate, are readily used for this purpose. Great emphasis is placed on the safety of compounds used in the food industry. As in the case of agriculture, biosurfactants and compounds of natural origin are tested for use in the food industry. Their use is not limited to being ingredients of products. They can play a biocidal, as well as a protecting role against surface colonization by microorganisms.
    Źródło:
    Wiadomości Chemiczne; 2020, 74, 5-6; 391-409
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Metody wyznaczania krytycznego stężenia micelarnego związków powierzchniowo czynnych
    Methods for determining critical micellar concentration of surfactants
    Autorzy:
    Grabowska, Ola
    Dywicki, Paweł
    Chmurzyński, Lech
    Powiązania:
    https://bibliotekanauki.pl/articles/171754.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Chemiczne
    Tematy:
    związki powierzchniowo czynne
    krytyczne stężenie micelarne
    konduktometria
    elektroforeza kapilarna
    izotermiczna kalorymetria miareczkowa
    metoda luminescencyjna
    surface active agents
    critical micelle concentration
    conductometry
    capillary electrophoresis
    isothermal titration calorimetry
    luminescent method
    Opis:
    Surface active agents, also known as surfactants, are a group of chemical compounds that are used in various products of the chemical industry. These compounds are components of medicines, detergents, motor oils and many others. The multitude of uses of surfactants makes it important to know their aggregation behaviour in solution. There are many methods used to analyse surfactants behaviour in liquid phase. The choice of a particular technique usually depends on the chemical structure of the surfactant. An example of a method that is used in studies of ionic surfactants is conductometry. This technique allows to study the dependence of specific conductivity on surfactant concentration, enabling determination of critical micellar concentration (CMC). Capillary electrophoresis is another example of the method used to determine the critical micellar concentration. It allows to make measurements in conditions where other methods fail, including conductometric method. Surfactant solutions differ in viscosity, which changes with the appearance of micelles in solution. Measurement of marker compound migration time through surfactant solutions of various concentrations allow to determine critical micellar concentration. Isothermal titration calorimetry (ITC) allows to study the thermal effects associated with the aggregation of surfactants into micelles. Based on the energy changes that occur during titration, the critical micellar concentration of surfactant can be precisely determined. ITC is very sensitive method, so basically it can be used to examine all types of surfactants. In addition, the ITC method allows to determine the thermodynamic parameters of the undergoing micellization process. The use of several measuring methods gives a more complete picture of the phenomena occurring in solutions. It allows to understand aggregation process more accurately. Therefore, CMC measurement are often made with the use of several complementary methods.
    Źródło:
    Wiadomości Chemiczne; 2020, 74, 5-6; 371-390
    0043-5104
    2300-0295
    Pojawia się w:
    Wiadomości Chemiczne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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