Temat: electrokinetic potential

Skocz do pozycji: 1.

Tytuł:: Teoreticheskie osnovy aktivirovanija rastvorov koaguljanta sul'fata aljuminija pri podgotovke pit'evojj vody
Theoretical bases activation coagulant solutions of aluminum of sulfate for preparation of drinking water
Autorzy:: Epojan, S.
Dushkin, S.
Ajjrapetjan, T.
Tematy:: drinking water
electrokinetic potential
adsorption
water treatment
intensification
aluminium sulphate; Pokaż więcej
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Powiązania:: https://bibliotekanauki.pl/articles/76354.pdf Link otwiera się w nowym oknie
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Brassinosteroid-lipid membrane interaction under low and high temperature stress in model systems
Autorzy:: Latowski, Dariusz
Janeczko, Anna
Filek, Maria
Dyba, Barbara
Rudolphi-Szydło, Elżbieta
Sadura, Iwona
Opis:: Background: In earlier studies [1], we indicated that applying brassinosteroids (BRs) to lipids that had been isolated from plants altered the physicochemical properties of the monolayers. A continuation of these dependencies using the defined model lipid systems is presented in this paper. The influence of homocastasterone (HCS) and castasterone (CS) (BRs for which the increase in concentration were characteristic of plants grown at low temperatures) on the membrane properties of their polar and the hydrophobic parts were studied. Results: Changes in the electrokinetic potential indicate that both BRs decreased the negative charge of the surface, which is an important factor in modifying the contacts with the polar substances. This property of BRs has not yet been described. The studies of the interactions that occur in the hydrophobic part of the membrane were investigated using the EPR methods and Langmuir techniques. The physicochemical parameters of the lipid structure were determined, and the excess of Gibbs free energy was calculated. Conclusion: We conclude that examined BRs modify both the hydrophilic and hydrophobic properties of the membranes, but to a greater extent HCS. The consequence of these changes may be the attempt to maintain the stability of the membranes in stressful temperature conditions and/or to the possibility of adsorption of other substances on membranes surfaces. The change of plant metabolism towards increasing the amount of BR, mainly HCS (under cooling) may by an important factor for maintaining optimal structural properties of membranes and their functionality despite temperature changes.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 3.

Tytuł:: Influence of lysozyme on the enzymatic coagulation of milk
Wpływ lizozymu na enzymatyczną koagulację mleka
Autorzy:: Panfil-Kuncewicz, H.
Kisza, J.
Tematy:: lysozyme
ren net coagulation of casein
electron microscopy
electrokinetic potential of casein micelles; Pokaż więcej
Wydawca:: Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie
Powiązania:: https://bibliotekanauki.pl/articles/1399141.pdf Link otwiera się w nowym oknie
Opis:: The influence of lysozyme on the rennet coagulatiom of casein, dispersed in various solutions, was investigated. The structure of coagulate precipitated from milk by lysozyme and the structure of lysozyme-rennet coagulate were determined by electron microscopy. The conducted experiments showed that lysozyme reduced the time of rennet coagulation proportionally to the amount added. Microscopic observations demonstrated a similarity of the structure of lysozyme coagulate and acid coagulate. The above results allow to draw the conclusion that the effect of lysozyme on casein is connected with a change in the electrokinetic potential of casein micelles in milk.
W pracy prześledzono wpływ dodatku lizozymu (0,5; 1,0 i 2,0 mg/cm³) na czas koagulacji podpuszczkowej kazeiny. Badania te przeprowadzono na świeżym mleku odtłuszczonym, roztworze kazeiny w dializacie mleka i sztucznym serum mleka, a także zawiesinie miceli kazeinowych w dializacie oraz sztucznym roztworze soli mleka. Stwierdzono, że we wszystkich układach doświadczenia, lizozym skracał czas podpuszczkowej koagulacji kazeiny proporcjonalnie do jego dodatku (tab. 1). Nie zaobserwowano praktycznie żadnych różnic w podatności próbek kazeiny na działanie podpuszczki w zależności od czasu ich wstępnej inkubacji z lizozymem (tab. 2). W dalszej części pracy określono strukturę koagulatu wytrąconego z mleka przez lizozym (12 mg/cm³), a także koagulatu ·podpuszczkowego mleka traktowanego lizozymem (2 mg/cm³). W celu porównania określono strukturę skrzepu podpuszczkowego i kwasowego mleka. Obserwacji koagulatów dokonano przy zastosowaniu mikroskopu elektronowego transmisyjnego (TEM) Tesla BS-500 oraz za pomocą mikroskopu elektronowego skaningowego (SEM) JEOL-JSM S1 (przy napięciu roboczym 10 MEV). Analiza uzyskanych elektrogramów wykazała podobieństwo struktury koagulatu lizozymowego i kwasowego (zdjęcia 2, 4, 6, 8). Oba rodzaje skrzepów charakteryzowały się wysokim (w porównaniu z koagulatem podpuszczkowym) stopniem zaglomerowania cząsteczek kazeiny oraz jej łańcuchów. Większa aglomeracja kazeiny w skrzepie kwasowym związana jest prawdopodobnie z szybką i niemal całkowitą neutralizacją ładunków powierzchniowych miceli. Podobny stopień aglomeracji miceli kazeinowych w koagulacie kwasowym i lizozymowym wynikać może ze zbliżonego mechanizmu tworzenia się obu rodzajów skrzepu. Wykazany w pracy wpływ lizozymu na koagulację podpuszczkową, możliwość wytrącania kazeiny z mleka przez ten enzym oraz podobieństwo struktury koagulatu lizozymowego i koagulalu kwasowego kazeiny mleka krowiego pozwalają przypuszczać, że oddziaływanie lizozymu na kazeinę łączy się z częściową redukcją potencjału elektrokinetycznego miceli kazeinowych. Zmiany te mogą wywierać pewien wpływ na procesy trawienia białek mleka, co może mieć istotne znaczenie praktyczne przy zastosowaniu lizozymu w humanizacji mleka krowiego.
Dostawca treści:: Biblioteka Nauki

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Tytuł:: Snizhenie agregativnojj ustojjchivosti kolloidnojj primesi prirodnykh vod aktivirovannym rastvorom koaguljanta sulfata aljuminija
Decline of aggregate stability of colloid admixture of natural waters by the activated solution of coagulant of sulfate of aluminium
Autorzy:: Ehpojan, S.
Dushkin, S.
Tematy:: water treatment
admixture
colloid
natural water
aggregate stability
coagulant
aluminium sulphate
electrokinetic potential
sewage treatment plant
drinking water; Pokaż więcej
Wydawca:: Komisja Motoryzacji i Energetyki Rolnictwa
Powiązania:: https://bibliotekanauki.pl/articles/77180.pdf Link otwiera się w nowym oknie
Opis:: Influence of the activated solution of coagulant of sulfate aluminium is examined on the decline of electrokinetic potential of colloid admixtures at cleaning of natural waters. It is set that the decline of aggregate stability of colloid admixtures of natural waters allows intensifying work of sewage treatment plants at preparation of drinking-water.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Macroion adsorption− electrokinetic and optical methods
Autorzy:: Michna, Aneta
Cytata wydawnicza:: Michna A. Macroion adsorption-electrokinetic and optical methods. Adv Colloid Interface Sci. 2017 Dec;250:95-131. doi: 10.1016/j.cis.2017.09.004.
Opis:: Recent studies on macroion adsorption at solid/ liquid interfaces evaluated by electrokinetic and optical methods are reviewed. In the first section the description of the electrokinetic phenomena at solid surface is briefly outlined. Various methods for determining both the static and the dynamic properties of electrical double layer, such as: the appropriate location of the slip plane, were presented. The theoretical approaches are discussed concerning quantitative interpretation of the streaming potential/ current measurements of homogeneous macroscopic interfaces, both bare and formed by microsphere adsorption. Experimental results are presented, involving the electrokinetic characteristics of bare surfaces, such as mica, silicon, glass etc. obtained from various types of electrokinetic cells. The effect of surface conductivity on the zeta potential was underlined. In the next section, various theoretical approaches, proposed to determine the distribution of electrostatic potential and flow distribution within macroion layers, were disscused. Accordingly, the influence of the uniform as well as non−uniform distribution of charges within macroion layer, the dissociation degree, and the surface conductance on electrokinetic parameters were discussed. The last section was devoted to the discussion of experimental data obtained by the streaming potential/ current measurements and optical methods, such as reflectometry, ellipsometry, surface plasmon resonance (SPR), colloid enhancement, and fluorescence technique, for mono− and multilayers of macroions. Results of polcations (PEI, PAMAM dendrimers, PAH, PDADMAC) and polyanions (PAA, PSS) adsorption on mica, silicon, gold, and PTFE are quantitatively interpreted in terms of theoretical approaches postulating the three dimensional charge distribution or random sequential adsorption model (RSA). Macroion bilayer formation, experimentally examined by streaming current measurements, and theoretically interpreted in terms of the comprehensive formalism was also reviewed. The utility of the electrokinetic measurements, combined with optical methods, for a precise, in situ characteristics of macroion mono− and multilayer formation at soid/ liquid interfaces is pointed out.
Dostawca treści:: Repozytorium Centrum Otwartej Nauki

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Skocz do pozycji: 6.

Tytuł:: Relationship between the rheological parameters and zeta potential of bentonites
Autorzy:: Kowalczyk, D.
Wach, M.
Plewik, A.
Wysocki, S.
Tematy:: electrokinetic phenomena
zeta potential
drilling fluids
bentonite; Pokaż więcej
Wydawca:: Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Powiązania:: https://bibliotekanauki.pl/articles/298880.pdf Link otwiera się w nowym oknie
Opis:: The paper presents an estimation of bentonites quality using electrokinetic phenomena occurring in dispersed clay systems. The idea behind the work is to demonstrate the relationship between the rheological parameters of the tested materials, and their zeta potential and consequently determine the suitability of these criteria for preparing drilling fluids.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: An effect of electrokinetics phenomena on nonlinear wave propagation in bubbly liquids
Autorzy:: Panahov, G.
Abbasov, E.
Bakhtiyarov, S.
Museibli, P.
Tematy:: fala nieliniowa
ciecz musująca
potencjał elektryczny
nonlinear waves
bubbly liquids
electrokinetic phenomena
perturbation
electric potential; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/2106456.pdf Link otwiera się w nowym oknie
Opis:: A study of nonlinear waves in liquid-gas mixtures with the consideration of internal effects is an important problem of both the fundamental and the applied fluid mechanics. Investigation of nonlinear waves in the gas-liquid mixtures with allowance for internal effects is an important task of both fundamental and applied fluid mechanics. These problems often arise in industrial processes such as oil and gas production, hydrocarbons pipeline transportation, gas-saturated fluids flow in pipelines, etc. In this work, we investigate the effect of the internal electric field on the nonlinear wave propagation in a bubbly liquid. Numerical simulations have been conducted to study the nonlinear waves described by the nonlinear Burgers-Korteweg-de Vries equation. The numerical simulations showed that the electrokinetic processes significantly affect the wave propagation process. The amplitude of the waves gradually decreases when the size of the gas bubble is decreasing and the electrical potential increases. A good agreement of obtained results with our previous predictions is found.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Activated biocarbons obtained from post-fermentation residue as potential adsorbents of organic pollutants from the liquid chase
Autorzy:: Nowicki, Piotr
Gruszczyńska, Karolina
Urban, Teresa
Wiśniewska, Małgorzata
Tematy:: post-fermentation residue
activated carbons
organic dyes adsorption
electrokinetic properties
zeta potential
surface charge density; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/2146892.pdf Link otwiera się w nowym oknie
Opis:: A series of new synthetic carbonaceous adsorbents has been prepared via physical and chemical activation of residue of alcoholic fermentation of corn starch. Two different variants of thermal treatment procedure - microwave and conventional heating have been applied for preparing of the activated biocarbons. All the samples under investigation were characterised by elementary analysis, surface area measurements as well as determination of the number of surface functional groups. The electrokinetic properties of examined materials were studied using potentiometric titration and electrophoresis methods, which enabled determination of the surface charge density and zeta potential of activated biocarbon particles. Moreover, sorption properties of the carbonaceous materials towards two organic dyes - methylene blue and malachite green were tested. The final products were activated biocarbons of medium developed surface area ranging from 21 to 879 m2/g, showing acidic character of the surface and various content of surface functional groups. More favourable textural parameters as well as sorption properties toward both organic dyes were revealed by chemically activated samples. The obtained results indicated also considerable effect of adsorbed dye molecules on the structure of electrical double layer formed at the solid/liquid interface.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Modification of solid substrates by controlled adsorption of macroions
Modyfikacja substratów stałych przez kontrolowaną adsorpcję makrojonów
Autorzy:: Morga, Maria
Adamczyk, Zbigniew
Tematy:: adsorption of macroions
electrokinetic characteristics of macroions
PAH and PDDA adsorption
macroion layers on solid substrates
streaming potential measurements
zeta potential of macroion molecules
adsorpcja makrojonów
charakterystyka makrojonów
adsorpcja PAH i PDDA
warstwa makrojonów na powierzchniach ciał stałych
pomiary potencjału przepływu
potencjał zeta makrocząstek; Pokaż więcej
Wydawca:: Polskie Towarzystwo Chemiczne
Powiązania:: https://bibliotekanauki.pl/articles/1853726.pdf Link otwiera się w nowym oknie
Opis:: Mechanisms of cationic macroion adsorption on negatively charged solid substrates comprising mica and silica were thoroughly discussed. Attention was focused on poly(allylamine hydrochloride) (PAH), poly(dimethyl-diallylammonium chloride) (PDDA) and poly-L-lysine (PLL) widely used in practice. The bulk physicochemical parameters controlling the macroion adsorption such as the diffusion coefficient, hydrodynamic diameter, intrinsic viscosity and electrophoretic mobility were discussed. The latter, experimentally accessible parameter, enables to determine the electrokinetic charge of macroion molecules, their isoelectric points and zeta potentials. On the other hand, the analysis of the hydrodynamic diameter and the intrinsic viscosity data confirmed a largely elongated shape of the molecules even for concentrated electrolyte solution. These results are used for a quantitative interpretation of macroion adsorption at solid substrates investigated using in situ streaming potential measurements. It is confirmed that the macroion mostly adsorb in the side-on orientation forming layers whose maximum coverage can be regulated by the ionic strength of the solution. This streaming potential method can also be used to determine the stability of the layers performing controlled desorption kinetic measurements. It is shown that at pH 7.4 the PDDA and PLL macroions form stable layers on solid substrates, which can be used for an efficient immobilization of negatively charged macroions and bioparticles comprising protein molecules and viruses.
Dostawca treści:: Biblioteka Nauki

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