INFLUENCE OF ULTRASOUND ON THE CHANGE OF LIQUID VOLUME FRACTION IN FOAM AND ITS STABILITY
Journal: HERALD OF TECHNOLOGICAL UNIVERSITY
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
Penza State University of Architecture and Construction
2.
Penza State University
(Department of Chemistry and methods of teaching chemistry, associate professor)
employee
Penza State University (Department of Chemistry and methods of teaching chemistry, associate professor)
Penza, Russian Federation
employee
Penza State University (Department of Chemistry and methods of teaching chemistry, associate professor)
Penza, Russian Federation
3.
Penzenskiy gosudarstvennyy universitet
Russian Federation
Russian Federation
Type:
Article
Pages:
from 36
to 40
Status:
Language:
Russian
Keywords:
BULK AND MULTILAYER FOAM, ULTRASONIC ACTION, LIQUID VOLUME FRACTION, STABILITY
Abstract (English):
The wave method of acting on matter has long been an area of intense scientific and technological research. Ultrasonic dispersion allows to obtain various highly dispersed, homogeneous and chemically pure suspensions of solid particles in liquids; accelerates and improves the process of obtaining emulsions; ultrasonic waves of different frequencies create conditions for obtaining the structure of the material, which is characterized by isotropy of certain properties. However, the mechanism of action on dispersed systems, namely Pickering systems, is not well understood today. In this work, a study of the variation of liquid volume fraction and stability of bulk foam and its monolayers has been carried out to determine the features and nature of the failure of this dispersed system under wave action. The dependence of foam multiplicity and stability on the concentration and nature of solid particle-stabilizers (titanium oxide, clay, Aerosil-380), as well as on the content and structure of surfactant modifiers (anionic surfactant sodium decyl sulfate, cationic surfactants hexylamine and cetyltrimethylammonium bromide) is shown. The increase in the concentration of solid particles led to an increase in the resistance of foams to ultrasonic actions. The study of changes in the multiplicity and stability of foams at changing the concentration of water repellent showed that the maximum resistance to ultrasonic impacts was observed not at the maximum concentration of surfactant, but at the concentration corresponding to the maximum contact angle of wetting of particles (540). The use of long-chain surfactant cetyltrimethylammonium bromide increased the stability of the foam layer to ultrasonic action at a lower (compared to hexylamine) degree of modification of the surface of solid particles.
The wave method of acting on matter has long been an area of intense scientific and technological research. Ultrasonic dispersion allows to obtain various highly dispersed, homogeneous and chemically pure suspensions of solid particles in liquids; accelerates and improves the process of obtaining emulsions; ultrasonic waves of different frequencies create conditions for obtaining the structure of the material, which is characterized by isotropy of certain properties. However, the mechanism of action on dispersed systems, namely Pickering systems, is not well understood today. In this work, a study of the variation of liquid volume fraction and stability of bulk foam and its monolayers has been carried out to determine the features and nature of the failure of this dispersed system under wave action. The dependence of foam multiplicity and stability on the concentration and nature of solid particle-stabilizers (titanium oxide, clay, Aerosil-380), as well as on the content and structure of surfactant modifiers (anionic surfactant sodium decyl sulfate, cationic surfactants hexylamine and cetyltrimethylammonium bromide) is shown. The increase in the concentration of solid particles led to an increase in the resistance of foams to ultrasonic actions. The study of changes in the multiplicity and stability of foams at changing the concentration of water repellent showed that the maximum resistance to ultrasonic impacts was observed not at the maximum concentration of surfactant, but at the concentration corresponding to the maximum contact angle of wetting of particles (540). The use of long-chain surfactant cetyltrimethylammonium bromide increased the stability of the foam layer to ultrasonic action at a lower (compared to hexylamine) degree of modification of the surface of solid particles.
Keywords:
BULK AND MULTILAYER FOAM, ULTRASONIC ACTION, LIQUID VOLUME FRACTION, STABILITY
BULK AND MULTILAYER FOAM, ULTRASONIC ACTION, LIQUID VOLUME FRACTION, STABILITY
