Istvan szilagyi, gregor trefalt, alberto tiraferri, plinio maroni and michal borkovec department of inorganic and analytical chemistry, university of geneva, sciences ii, quai ernestansermet 30, 1205 geneva, switzerland. Basak kayitmazer seagram center for soil and water sciences, faculty of agricultural food and environmental sciences. The ph of the dye solution was adjusted by using naoh or hcl solution and a ph meter. Initial adsorption energy and apriori heterogeneity coverage dependence of the adsorption energy. Study of film structure and adsorption kinetics of polyelectrolyte. Pdf quartz crystal microbalance qcm is a widely used technique to characterize adsorption desorption phenomena at the solidliquid interface find, read and cite all the research you need.
Study of in situ adsorption kinetics of polyelectrolytes. Adsorption isotherms, kinetics and mechanism for the adsorption of cationic and anionic dyes onto carbonaceous particles prepared from juglans regia shell biomass s. Request pdf kinetics and isotherms of cationic polyelectrolyte adsorption on quartz the kinetics of the formation of quartz surface charge in the solutions of a cationic polyelectrolyte, poly. Effect of ph and polymer concentration akhilesh garg, james r. Introduction various industries such as dye manufacturing, pulp and paper, tanneries, cosmetics, coffee pulping. Moisture absorption and absorption kinetics in polyelectrolyte films. Request pdf kinetics of polyelectrolyte adsorption on cellulosic fibers the present investigation has been focused on studying the adsorption of three different molecular mass fractions of a. Polyelectrolyte adsorption on oppositely charged surfaces. Kinetics and isotherms of cationic polyelectrolyte adsorption. This paper analyzes the dualpolyelectrolyte treatment with pah and xylan as a polyelectrolyte bilayer on an unbleached recycled softwood kraft pulp. Adsorption isotherms, kinetics, thermodynamics and desorption.
The accompanying paper will consider displacement kinetics when, after one. The process was confirmed by laser light scattering lls and fluorescence measurements. Batch study, equilibrium and kinetics of adsorption of selenium 587 journal of engineering science and technology october 2011, vol. Kinetics of polyelectrolyte adsorption on cellulosic. The polyelectrolyte concentration is normalized with respect to it critical overlap. Pdf this work utilizes a combination of theory and experiments.
Role of counterions, journal of colloid and interface science on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. A nonequilibrium theory taking into account adsorption kinetics. Then, the xylan adsorption on an untreated and also on a previously pahtreated pulp was studied at. Kinetics of polyelectrolyte adsorption on cellulosic fibres. Theoretical approaches to polyelectrolyte adsorption are generally. Adsorption of proteins on spherical polyelectrolyte. The adsorption of proteins from solution to solid substrates is an important phenomenon. As the polyelectrolyte adsorption theory does not only apply to long polymer chains, but also to the adsorption of oligomers, it is important to test the theory for short chains, too. A theory of adsorption and desorption kinetics for polyelectrolytes on a planar surfaces in. Polymer composed of macromolecules in which a substantial portion of the constitutional units contains ionic or ionizable groups, or both. Polyelectrolyte adsorption an overview sciencedirect topics. Effect of pore size on adsorption of a polyelectrolyte to.
Models for the adsorption behavior of polyelectrolytes in solution to a solid surface are extremely situational. Adsorption isotherms, kinetics and mechanism for the. Continuous polyelectrolyte adsorption under an applied. Kinetics and isotherms of cationic polyelectrolyte. The effect of ph was observed by studying the adsorption of dye over the ph range from 3 to. Advincula, polyelectrolyte adsorption processes characterized in situ using the quartz crystal microbalance technique. These interactions, and therefore the adsorption process itself, may be controlled through solution variables such as salt concentration and ph 5 12. Read overshoots of adsorption kinetics during layerbylayer polyelectrolyte film growth. Changing the ionic strength by addition of salt can modulate the electrostatic interactions in a polyelectrolyte solution. For the solidsupported multilayers, the adsorption kinetics and the complex shear modulus were measured using a dissipative quartz crystal microbalance and a null ellipsometer. We discuss the adsorption of a single polyelectrolyte chain on a charged surface of opposite charge. Davis, departments of chemical engineering, physics, and chemistry, virginia tech, blacksburg, virginia 24061 received february 15, 2008. Adsorption versus depletion of polymer solutions selfsimilar adsorption pro. The kinetics of adsorption of dyes onto jsac was carried out by withdrawing and analyzing the samples at the time interval of every 5 min for the.
Study of in situ adsorption kinetics of polyelectrolytes and. Negatively charged sodium dodecylbenzenesulfonate sdbs surfactants could be readily internalized into the cationic microgels by means of electrostatic interactions, resulting in microgel collapse and concomitant formation of. In this research, this correlation is investigated and its dependence on polyelectrolyte concentration, molecular weight, charge localization and backbone rigidity and hydrophobicity is studied. Polyelectrolyte adsorption, interparticle forces, and colloidal aggregation. In this case the surface must be modified by suitable groups to resist protein adsorption. Polyelectrolyte adsorption and charge inversion springerlink. Jul 05, 2011 read evidence of the influence of adsorption kinetics on the internal reorganization of polyelectrolyte multilayers, colloids and surfaces a. However, there generally exists an upper limit to the extent of polyelectrolyte adsorption. Kinetics of sequential adsorption of polyelectrolyte. Finally, the factors controlling the kinetics of polyelectrolyte adsorption as well as the models. We discuss theoretically the adsorption of linear weakly charged polyelectrolyte solutions on an oppositely charged solid surface using the classical selfconsistent mean field theory. Equilibrium thermodynamics and adsorption isotherms.
Adsorption and desorption kinetics of polyelectrolytes on planar. Electrostatic adsorption isotherm is described by the langmuir equation with the energy of molecular adsorption of 25. Effect of pore size on adsorption of a polyelectrolyte to porous glass yael g. First, the pah behavior was characterized during its adsorption onto the pulp. The adsorption and desorption of watersoluble polyelectrolytes on silicon wafers were. Employing polyions with a reduced charge density along the chain, i. Adsorption of xylan onto cellulose fibers pretreated with. Adsorption kinetics of cationic polyelectrolytes studied with. A bubble tensiometer was used to measure the adsorption kinetics and the elasticity modulus of the liquidsupported multilayers.
In other situations the polyelectrolyte chains will deplete from the surface. Francois quemeneur, marguerite rinaudo and brigitte pepindonat. Kinetics of polyelectrolyte adsorption on cellulosic fibers. Negatively charged sodium dodecylbenzenesulfonate sdbs surfactants could be readily internalized into the cationic microgels by means of electrostatic interactions, resulting in microgel collapse and concomitant formation of surfactant. Vastly different behaviors are exhibited based on varying polyelectrolyte character and concentration, ionic strength of the solution, solid surface character, and ph, among several other factors. Construction of polyelectrolyteresponsive microgels, and. Study of film structure and adsorption kinetics of. Let us start by considering single chain behavior in a dilute aqueous solution of polyelectrolytes 5.
Jan 23, 2007 interactions between charged macromolecules e. This paper analyzes the dual polyelectrolyte treatment with pah and xylan as a polyelectrolyte bilayer on an unbleached recycled softwood kraft pulp. Adsorption of xylan onto cellulose fibers pretreated with cationic polyelectrolyte and its effect on paper properties. Xylan is known as a strengthenhancing agent for paper. The results show that the lm w polymer can reach all the charges in the fiber wall whereas the mm w and hm w can only reach the charges on the external surfaces of the fibers. The sorption studies were carried out at different temperatures 30 0, 40 0, 50 0c. The terms polyelectrolyte, polymer electrolyte, and polymeric electrolyte should not be confused with the term solid polymer electrolyte. Adsorption, kinetic, equilibrium and thermodynamic studies. If the solid surface has an indifferent short range interaction with the polymer at the crossover point between attraction and repulsion, we show that its charge is always overcompensated by the adsorption of. In both the cases linear plots were obtained, which reveal the applicability of these isotherms on the ongoing adsorption process. Study of film structure and adsorption kinetics of polyelectrolyte multilayer films. Pdf study of film structure and adsorption kinetics of. Following this, it is illustrated where the polyelectrolytes adsorb.
Based on the steady values of the surface charge, the isotherms and potentials of adsorption of cationic polyelectrolyte are calculated. Joanny physicochimie curie institut curie aps march meeting pgg symposium. Adsorption isotherms, kinetics, thermodynamics and. Adsorption kinetics and mechanical properties of ultrathin. Nonlinear hairy layer theory of electrophoretic fingerprinting applied to consecutive layer by layer polyelectrolyte adsorption onto charged polystyrene latex particles. Protein adsorption on surfaceattached weak polyelectrolyte layers p. Polyelectrolyte adsorption onto an initiallybare solid surface. In analogy with kramers rate theory for chemical reactions we present a model which is based on the assumption that a polyelectrolyte encounters a barrier in its motion towards an adsorbing surface. An experimental and theoretical study of oligo and. The accompanying paper will consider displacement kinetics when, after one population of chains had become adsorbed to a solid surface of opposite charge, a second population of. Adsorption is usually spontaneous, with electrostatic interactions naturally playing a key role. Polyelectrolyte adsorption, interparticle forces, and.
Lin, and wenli wu polymers division, national institute of standards and technology, gaithersburg, maryland 20899 received july 8, 2003. Physicochemical and engineering aspects on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. A quantitative analysis of surface roughness volume 19 issue 4 andreia a. Polyelectrolyte adsorption wikimili, the free encyclopedia. The alternate adsorption of polycation polyallylamine. We investigate here the influence of an applied electric potential on the adsorption of charged polymers, and report the following significant result. The effects of charge density, ph, and salt concentration on polyelectrolyte adsorption onto the oxidized surface of. Adsorption, cationic compounds, cellulose fibres, kinetics. The formation is measured using multiparametric surface plasmon resonance to determine adsorption kinetics. Jan 01, 2014 read overshoots of adsorption kinetics during layerbylayer polyelectrolyte film growth. Polyelectrolyte adsorption is considered in the following section and the formation of polyelectrolyte complexes in section 3. The dye uptake process was found to follow second order kinetics. Freundlich and langmuir adsorption isotherms and kinetics.
Read evidence of the influence of adsorption kinetics on the internal reorganization of polyelectrolyte multilayers, colloids and surfaces a. Kinetics of polyelectrolyte adsorption on cellulosic fibres diva portal. However, it is difficult to adsorb xylan onto cellulose fibers because it carries the same negative charge as. Evidence of the influence of adsorption kinetics on the. Chapter 4 describes the synthesis of these oligomers.
The kinetics of polyelectrolyte adsorption has been investigated theoretically. Alternate adsorption properties in ultrathin polymer films, colloids surf. The problem of charged polymer chains polyelectrolytes as they adsorb on a planar surface is addressed theoretically. Adsorption and depletion of polyelectrolytes from charged. Both kinetics of adsorption and equilibrium adsorption measurements have been conducted, and the adsorption has been measured by polyelectrolyte titration.
The results show that the lmw polymer can reach all the charges in the fibre wall whereas the mmw and hmw can only reach the charges on the external surfaces of the fibres. Davis, departments of chemical engineering, physics, and chemistry, virginia tech, blacksburg, virginia 24061. The results show that the lmw polymer can reach all the charges in the fiber wall whereas the mmw and hmw can only reach the charges on the external surfaces of the fibers. For the high molecular mass polyelectrolyte a more sophisticated model is needed. Because the polyelectrolyte creates a thin adsorbing layer adjacent to the surface, the overall charge of the surface combined with the adsorbing polymer can have an opposite sign than the original surface charge. Kinetic regimes of polyelectrolyte exchange between the. Adsorption of proteins on spherical polyelectrolyte brushes. Polyelectrolyte adsorption an overview sciencedirect. Adsorption, kinetic, equilibrium and thermodynamic studies on.