The zeta potential of our samples was determined with a zeta potential analyzer from. The colloidal system is stable when a dominant role is played by the forces causing the mutual repulsion of the particles. The determination of the zeta potential of casein micelles. The magnitude of the zeta potential gives an indication of the potential stability of the colloidal system.
Prior to the advent of streaming current monitors, zeta meters were the primary instruments for measuring electrokinetic. Mcdaniel using zeta potential as a healing tool the edta story using disodium edta as an anionic surfactant. Control of colloid stability through zeta potential zeta potential is a measure of the electrical force that exists between atoms, molecules, particles, suspensoids, cells, etc. Zeta potential and colloid chemistry eric olson abstract the us food and drug administration often requests the measurement of zeta potential. Zeta potential is measured in liquidliquid or solidliquid colloidal systems. Principles and applications covers the concept of the zeta potential in colloid chemical theory. The square of the zeta potential is proportional to the force of electrostatic repulsion between two charged. Stanford libraries official online search tool for books, media, journals, databases, government documents and more. As these parameters are related to the colloid charge, we also briefly discuss the mechanism of charge neutralization. Zeta potential analyses is a technique for determining the dispersion stability of nps in solution fig. Whats the relation between zeta potential and stability of. In its original version, however, the dlvo theory includes the additional step to calculate aggregation rates. Principles, methods and applications provides a thorough introduction to colloid science for industrial chemists, technologists and engineers.
Zeta potential is a measure of the magnitude of the electrostatic or charge repulsionattraction between particles and is one of the fundamental parameters known to affect stability. Sometimes the dispersed substance alone is called the colloid. Heat treatment of milk between 90 c30 min and 5 c50 min had no significant effect on zeta potential. Since zeta potential is not equal to the electric surface potential in a double layer or to the stern potential, it is often the only value that can be used to describe doublelayer properties of. Apr 01, 20 the parameter that is used to describe this real, measurable potential is the zeta potential. In chemistry, a colloid is a mixture in which one substance of microscopically dispersed insoluble or soluble particles is suspended throughout another substance. L download it once and read it on your kindle device, pc, phones or tablets. Zeta potential measurements provide an important criterion for the stability of a colloid system hunter 1981. A colloidal system consists of a dispersed phase that is distributed uniformly in a continuous phase. Principles and applications, issn 03059723 0123619610, 9780123619617 moral problems in medicine a practical coursebook, palmer michael, michael palmer, sep 1, 2005, medical, 192 pages.
Control of colloid stability through zeta potential. It can be used to optimize the formulations of suspensions and emulsions. Apr 05, 2010 the streaming potential of mica covered by monodisperse latex particles was measured using the parallelplate channel, fourelectrode cell. In order to explain the obtained zeta potential dependencies in the presence of ionic polyamino acids, it is necessary to analyze the relations between the amount of polymer adsorption and the dissociation degree of the studied polyamino acids. In the colloidal chemistry literature, it is usually denoted using the greek letter zeta, hence. In prior literature, it is usually denoted using the greek letter zeta. Aug 04, 2015 zeta potential part 17cbse grade 12 chemistryunit 5. For entropic reasons the chains avoid the space between two close particles, or between a particle and a planar wall, and create an effective attraction among the colloid particles. Effect of mixing water types on the timedependent zeta potential of portland cement paste article pdf available in science and engineering of composite materials 203 august 20 with 431 reads. Jun 04, 2014 the zeta potential measurements allow to estimate of colloidal suspension stability. In cell biology, the concept of zeta potential has been used to study cell biological activation, cell agglutination and cell.
Principles, methods and applications characteristic features of surfactantsclassification and applications of additional resources for colloid science. Zeta potential of mica covered by colloid particles. Its measurement brings detailed insight into the causes of dispersion, aggregation or flocculation, and can be applied to improve the formulation of dispersions. The negative charge may be quantified by zeta potential or streaming potential measures. It is also an aid in predicting longterm stability. Zeta potential is a measure of the magnitude of the repulsion or attraction between particles. These surface potentials could be obtained in experiments from zeta potential measurements for the bare wall and for one saturated with patches. The potential difference electroosmosis and allied phenomena between the fixed part and freely mobile portions of double layer known as zeta potential i. Colloid science is the study of systems involving small particles of one substance suspended in another.
Principles and applications colloid sciences series. These parameters will be used in all other examples discussed below. The streaming potential of mica covered by monodisperse latex particles was measured using the parallelplate channel, fourelectrode cell. Comparison of the zeta potential with the diffuse layer potential from charge titration. Journal of colloid and interface science 449 2015 443451. Colloid science principles methods and applications. From a theoretical viewpoint, the zeta potential is the electric potential in the. However, owing to a variety of factors, this is not necessarily the case. Zeta potential can be quantified by tracking the colloidal particles through a microscope as they migrate in a voltage field. Guidelines are available in other standards, and there exists a wealth of information in texts and publications. Although zeta potential is an intermediate value, it is sometimes considered to be more significant than surface potential as far as electrostatic repusion is concerned. Application of the zeta potential measurements to explanation.
In the colloidal chemistry literature, it is usually denoted using the greek letter zeta. Zeta potential in colloid sciencetheory and application. Lectures are collated and presented in a coherent and logical text on practical colloid science. Its a measure of the electrical charge of particles are that are suspended in liquid. Control of colloid stability through zeta potential by thomas m. Download pdf colloid science free online new books in. Zeta potential is a very important interfacial electrokinetic property to a huge number of natural phenomena, such as electrode kinetics, electrocatalysis, corrosion, adsorption, crystal growth, colloid stability and flow characteristics of colloidal suspensions and electrolyte solutions through porous media and microchannels. In order to discuss zeta potential in some detail, it is imperative to begin by defining the particles and systems to which zeta potential pertains. Zetapotential measurement using the smoluchowski equation. The zeta potential in colloid science is the overall charge a particle acquires in a specific medium. Based on lectures given at the highly successful bristol colloid centre spring school, colloid science.
Principles and applications covers the concept of the zeta potential in. What is zeta potential in colloid science overall charge. When the zeta potential equals zero, the colloid will precipitate into a solid. Simplifying the measurement of ze ta potential using m3pals, technical note available from.
Nanomedicine formulations typically represent a multifunctional and multicomponent system. The dispersed phase contains particles or micelles that have a linear dimension between 1 nm and 1. The zeta potential of the particles is the electric potential at the boundary of the double layer on the particle surface. Over 10 million scientific documents at your fingertips.
If all the particles have a large negative or positive zeta potential they will repel each other and there is dispersion stability. Suspensions of liquids form the basis of a wide variety of systems of scientific and technological importance including paints, inks, ceramics, cosmetics, soils, biological cells, and many food preparations. From a theoretical viewpoint, the zeta potential is the electric potential in the interfacial double layer at the location of the slipping plane relative to a point in the bulk fluid away. Riddick introduction excerpts and important material glossary. Dvlo theory suggests that the stability of a colloidal system is determined by the sum. The velocity in metresecond for a unit field strength 1 volt per metre is called the electrophoretic mobility, and is given the symbol e. Coagulation process is usually explained by charge neutralization mechanism. Zeta potential that is less negative than 15 mv typically represents the beginnings of agglomeration of particles. Ep11 electric double layer edl and dlvo forces nano 202 ucsd. A standard reference material for the measurement of.
The electrostatic potential on that surface is called the zeta potential and it is that potential which is measured, when one measures the velocity of the particles in a d. The zeta potential is an important parameter for a number of applications including characterization of biomedical polymers 1,2, electrokinetic transport of. Zeta potential and colloid chemistry eric olson abstract. The zeta potential of casein micelles was observed to increase with increase in temperature from 10 to 50 c and to decrease with decrease in ph. Measurements made using techniques based upon each effect should give the same value for zp. Pdf zeta potential in colloid science principles and. Lyklema j, fundamentals of interface and colloid science. Zeta potential in colloid sciencetheory and application, by r.
Use features like bookmarks, note taking and highlighting while reading zeta potential in colloid science. We have used r 250 nm and a hamaker constant of h 5. The zeta potential of latex bearing amidine charged groups was regulated by the addition of nacl 10. Simplifying the measurement of zeta potential using m3pals, technical note available from. Potential energy hard sphere h depletion interaction. Pdf effect of mixing water types on the timedependent. Understanding zeta potential in suspension youtube. Zeta potential is a scientific term for electrokinetic potential in colloidal dispersions. Zeta potential is a physical property which is exhibited by any particle in suspension. Zeta potential represents a basic law of nature, and it plays a vital role in all forms of plant and animal life.
The higher is an absolute value of the zeta potential, the greater the probability that the studied suspension will be stable. Principles and applications colloid sciences series kindle edition by hunter, robert j. The book discusses the charge and potential distribution at interfaces. The surface charge on the swnt micelles, as measured by the. The higher value of zeta potential increase the particles stability.
806 151 1607 334 1215 1391 131 185 539 617 1522 1020 697 613 1381 804 1605 352 1436 526 815 999 380 1303 552 991 529 584 505 1135 44 1258 269 273 1367 960 225 318 187 497 1002 911 284