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Zhang H, Jing G, Luo J, Tang Y, Yu QJ, Zheng C, Wang M. Assessment of transportation processes of polyacrylamide in chernozem and saline soil by numerical model. ENVIRONMENTAL TECHNOLOGY 2021; 42:2350-2360. [PMID: 31829096 DOI: 10.1080/09593330.2019.1701566] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Accepted: 11/30/2019] [Indexed: 06/10/2023]
Abstract
Polyacrylamide (PAM) was studied in two characteristic soils in Daqing City: chernozem and saline soil. 120 mg L-1 of KBr was used as a conservation tracer to estimate diffusion coefficients and pore velocities of chernozem and saline soil by using the breakthrough curves (BTCs) of Br-. Isothermal adsorption equations were coupled with the traditional two-site model to establish the transportation equation of PAM. The results of comparing the simulation curve with the BTCs of PAM at different rates showed that the transportation equation of PAM could simulate the transport process of PAM in soil column accurately. PAM behaved as non-equilibrium adsorption in both soils by calculating the kinetic parameters in this equation. The results of this work not only confirmed the kinetic parameters of PAM in both soils, but also found that there is a good liner relationship between the mass transfer coefficient and pore velocity. The R2 values of the two linear equations are 0.983 and 0.979. These linear equations provide a good prediction basis for site prediction. In addition, it was found that organic matter is the main influence factor for the adsorption capacity of chernozem causing significantly larger than that of saline soil.
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Affiliation(s)
- Huibo Zhang
- Heilongjiang Key Laboratory of Petroleum and Petrochemical Multiphase Treatment and Pollution Prevention, College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing, People's Republic of China
| | - Guolin Jing
- Heilongjiang Key Laboratory of Petroleum and Petrochemical Multiphase Treatment and Pollution Prevention, College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing, People's Republic of China
| | - Jian Luo
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Yuening Tang
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Qiming Jimmy Yu
- School of Engineering and Built Environment, Griffith University, Brisbane, Australia
| | - Chen Zheng
- Heilongjiang Key Laboratory of Petroleum and Petrochemical Multiphase Treatment and Pollution Prevention, College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing, People's Republic of China
| | - Mengqi Wang
- Heilongjiang Key Laboratory of Petroleum and Petrochemical Multiphase Treatment and Pollution Prevention, College of Chemistry & Chemical Engineering, Northeast Petroleum University, Daqing, People's Republic of China
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Effect of polycation charge density on polymer conformation at the clay surface and consequently on pharmaceutical binding. J Colloid Interface Sci 2019; 552:517-527. [DOI: 10.1016/j.jcis.2019.05.079] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 05/22/2019] [Accepted: 05/24/2019] [Indexed: 11/23/2022]
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Tiraferri A, Maroni P. Rapid Desorption of Polyelectrolytes from Solid Surfaces Induced by Changes of Aqueous Chemistry. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:12302-12309. [PMID: 30251860 DOI: 10.1021/acs.langmuir.8b02573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The short-term desorption induced by changes of aqueous chemistry of predeposited polyelectrolyte layers on solid surfaces was studied with reflectometry. The behavior of a strong polycation, polydiallydimethylammonium chloride (PDADMAC), interacting with flat silica was investigated in detail. Results showed that partial desorption of preadsorbed polymer chains can be quickly triggered by changes in ionic strength and pH. When lowering these parameters in the PDADMAC-silica system, the increased lateral repulsive potential of neighboring chains drove the desorption of some of the polymer. Furthermore, layer desorption was favored when electrostatic interactions between a polyelectrolyte and the underlying surface became less attractive or switched to being repulsive. At the investigated timescales (<1 h), adlayer desorption was always partial and often incomplete. When initiating desorption from a condition of large adsorbed mass, desorption effects did not result in the plateau mass obtained by adsorption on a clean surface: an excess mass remained deposited. The results thus suggest that a relatively large energy barrier needs to be overcome to induce redissolution of predeposited chains and that this barrier may be a function of the number of polymer-surface interactions, which are in turn correlated with polymer molecular mass. These mechanisms have important implications for environmental processes and colloidal systems because they imply that, once adsorbed, polymeric chains may be redissolved but only to a limited degree at typical engineering timescales.
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Affiliation(s)
- Alberto Tiraferri
- Department of Environment, Land and Infrastructure Engineering , Politecnico di Torino , Corso Duca degli Abruzzi 24 , 10129 Turin , Italy
| | - Plinio Maroni
- Department of Inorganic and Analytical Chemistry , University of Geneva , Sciences II, Quai Ernest-Ansermet 30 , 1205 Geneva , Switzerland
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Caetano DLZ, de Carvalho SJ, Metzler R, Cherstvy AG. Critical adsorption of periodic and random polyampholytes onto charged surfaces. Phys Chem Chem Phys 2017; 19:23397-23413. [PMID: 28825753 DOI: 10.1039/c7cp04040g] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
How different are the properties of critical adsorption of polyampholytes and polyelectrolytes onto charged surfaces? How important are the details of polyampholyte charge distribution on the onset of critical adsorption transition? What are the scaling relations governing the dependence of critical surface charge density on salt concentration in the surrounding solution? Here, we employ Metropolis Monte Carlo simulations and uncover the scaling relations for critical adsorption for quenched periodic and random charge distributions along the polyampholyte chains. We also evaluate and discuss the dependence of the adsorbed layer width on solution salinity and details of the charge distribution. We contrast our findings to the known results for polyelectrolyte adsorption onto oppositely charged surfaces, in particular, their dependence on electrolyte concentration.
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Affiliation(s)
- Daniel L Z Caetano
- Sao Paulo State University (UNESP), Institute of Biosciences, Humanities and Exact Sciences (Ibilce), Campus Sao Jose do Rio Preto, 15054-000, Brazil.
| | - Sidney J de Carvalho
- Sao Paulo State University (UNESP), Institute of Biosciences, Humanities and Exact Sciences (Ibilce), Campus Sao Jose do Rio Preto, 15054-000, Brazil.
| | - Ralf Metzler
- Institute for Physics & Astronomy, University of Potsdam, 14476 Potsdam-Golm, Germany.
| | - Andrey G Cherstvy
- Institute for Physics & Astronomy, University of Potsdam, 14476 Potsdam-Golm, Germany.
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Su J, Garvey CJ, Holt S, Tabor RF, Winther-Jensen B, Batchelor W, Garnier G. Adsorption of cationic polyacrylamide at the cellulose–liquid interface: A neutron reflectometry study. J Colloid Interface Sci 2015; 448:88-99. [DOI: 10.1016/j.jcis.2015.02.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 02/02/2015] [Accepted: 02/03/2015] [Indexed: 11/26/2022]
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Ramos J, Forcada J, Hidalgo-Alvarez R. Cationic Polymer Nanoparticles and Nanogels: From Synthesis to Biotechnological Applications. Chem Rev 2013; 114:367-428. [DOI: 10.1021/cr3002643] [Citation(s) in RCA: 144] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jose Ramos
- POLYMAT,
Bionanoparticles Group, Departamento de Química Aplicada, UFI
11/56, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, Apdo. 1072, 20080 Donostia-San
Sebastián, Spain
| | - Jacqueline Forcada
- POLYMAT,
Bionanoparticles Group, Departamento de Química Aplicada, UFI
11/56, Facultad de Ciencias Químicas, Universidad del País Vasco UPV/EHU, Apdo. 1072, 20080 Donostia-San
Sebastián, Spain
| | - Roque Hidalgo-Alvarez
- Grupo
de Física de Fluidos y Biocoloides, Departamento de Física
Aplicada, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain
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Sybachin AV, Efimova AA, Litmanovich EA, Menger FM, Yaroslavov AA. Complexation of polycations to anionic liposomes: composition and structure of the interfacial complexes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:10034-9. [PMID: 17718526 DOI: 10.1021/la701411y] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Poly(N-ethyl-4-vinylpyridinium bromide) (a polycation with a degree of polymerization of 1100) was adsorbed onto liposomes composed of egg lecithin with a 0.05-0.20 molar fraction (nu) of anionic headgroups provided by cardiolipin (a doubly anionic lipid). According to electrophoretic mobility data, this led to total charge neutralization of the liposomes, whereupon the liposomes adopted a positive charge as additional polymer continued to adsorb. Although the liposomes aggregated at the charge-neutralization point, they disassembled into individual liposomes after becoming positively charged. The degree of polymer adsorption was shown to reach a limit. Thus, by measuring the free polymer content in a liposome suspension, it was possible to determine the polymer concentration at which the liposome surface became saturated with polymer. Beyond this point, an electrostatic/steric barrier at the surface suppressed further adsorption. Dynamic light scattering studies of liposomes with and without adsorbed polymer allowed calculation of the polymer film thickness which ranged from 22 to 35 nm as the molar fraction of cardiolipin (nu) increased from 0.05 to 0.20. The greater the content on the anionic lipid in the bilayer, the thicker the polymer film. The maximum number of polymer molecules adsorbed onto the liposomes was estimated: 1-2 molecules for nu = 0.05; 3 molecules for nu = 0.1; 4- molecules for nu = 0.15; and 6 molecules for nu = 0.2. The polymer appears to lie on the liposome surface, rather than embedding into the bilayer, because addition of NaCl easily dislodges the polymer from the liposome into the bulk water.
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Affiliation(s)
- A V Sybachin
- Department of Chemistry, M. V. Lomonosov Moscow State University, Leninskie Gory, Moscow 119992, Russia
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Siew CK, Williams PA, Young NWG. New Insights into the Mechanism of Gelation of Alginate and Pectin: Charge Annihilation and Reversal Mechanism. Biomacromolecules 2005; 6:963-9. [PMID: 15762666 DOI: 10.1021/bm049341l] [Citation(s) in RCA: 102] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Studies have been undertaken on the binding of Mn2+ ions to two alginate samples of different mannuronate:guluronate ratios (M:G), a sample of low-ester amidated pectin and poly(acrylic acid) (PAA). The binding of Ca2+ ions has also been included for the latter for comparison. The binding curves showed an initial steep rise at low additions of Mn2+ or Ca2+ indicating that all of the ions were bound to the polymer chains with none remaining in solution. At higher additions, the binding curves showed a plateau region and the maximum amount bound, theta, was found to be 0.2, 0.2, 0.25, and 0.33 mol M(2+)/mol COO- for high M:G alginate, low M:G alginate, pectin, and PAA, respectively. The binding curves for Mn2+ and Ca2+ with PAA were superimposable. In all cases, theta was less than the stoichiometric equivalent and also less than predicted by Manning counterion condensation theory. The linear charge density, xi, for the polymers is 1.49, 1.55, 1.62, and 2.85, and it was found that at maximum binding the effective linear charge density, xi(effective), decreased to a value close to 1 in each case and not 0.5 as predicted from Manning's two-variable theory. The mobility of the PAA chains has been followed by electron spin resonance spectroscopy using nitroxide spin labels covalently attached to the polymer, and the gelation of the pectin and alginate samples has been monitored using small deformation oscillatory experiments. For PAA at maximum binding, it was noted that there was a loss of chain mobility and precipitation. For pectin and alginate, gelation occurred and the stoichiometric ratio for maximum binding corresponded to the stoichiometric ratio for the maximum in G'. Precipitation and gelation are attributed to the formation of polymer-metal complexes involving one or two carboxylate groups resulting in charge reversal or charge annihilation.
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Affiliation(s)
- Chee Kiong Siew
- Centre for Water-Soluble Polymers, North East Wales Institute, Plas Coch, Mold Road, Wrexham LL11 2AW, United Kingdom
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Shubin V, Samoshina Y, Menshikova A, Evseeva T. Adsorption of cationic polyelectrolyte onto a model carboxylic latex and the influence of adsorbed polycation on the charge regulation at the latex surface. Colloid Polym Sci 1997. [DOI: 10.1007/s003960050132] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Rustemeier O, Killmann E. Electrostatic Interactions and Stability of Poly-l -lysine Covered Polystyrene Latex Particles Investigated by Dynamic Light Scattering. J Colloid Interface Sci 1997; 190:360-70. [PMID: 9241179 DOI: 10.1006/jcis.1997.4875] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Adsorption isotherms of the pH dependent positively charged polyelectrolyte poly-l -lysine (PLL) on negatively and positively charged polystyrene latices are determined. With photon correlation spectrometry (PCS) the influence of the fluctuating PLL domaines in solution on the diffusion coefficient is observed at low salt concentrations c NaBr < 10(-3) M with lambda = c PE /c NaBr < 0.1 (c PE = concentration of the polyelectrolyte units). Screening of the charged layer by increasing electrolyte concentration results in large adsorbed amounts and layer thicknesses. At low molar mass of PLL the suspensions become unstable and the state and kinetic of flocculation is followed by the decreasing diffusion coefficient. PLL of higher molar mass (M w >/= 100 000) stabilizes the particles sterically and the adsorbed layer thicknesses can be determined. The conclusions drawn from PCS features are confirmed directly by raster electron micrographs of the filtered particles.
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Affiliation(s)
- O Rustemeier
- Technische Universitat Munchen, Institut fur Technische Chemie, Lichtenbergstrasse 4, Garching, 85747, Germany
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Eriksson L, Alm B, Stenius P. Formation and structure of polystyrene latex aggregates obtained by flocculation with cationic polyelectrolytes. Colloids Surf A Physicochem Eng Asp 1993. [DOI: 10.1016/0927-7757(93)80495-z] [Citation(s) in RCA: 54] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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13
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Cosgrove T, Obey T, Taylor M. Solvent relaxation NMR: bound fraction determination for sodium Poly(styrene sulphonate) at the solid/solution interface. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0166-6622(92)80110-n] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Popping B, Deratani A, Sebille B, Desbois N, Lamarche J, Foissy A. The effects of electrical charge on the adsorption of a weak cationic polyelectrolyte onto silica, silicon carbide and calcium fluoride. ACTA ACUST UNITED AC 1992. [DOI: 10.1016/0166-6622(92)80091-f] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Meadows J, Williams P, Garvey M, Harrop R. Manipulation of the stability and redispersibility of polyelectrolyte-coated latex particles in various electrolyte solutions. J Colloid Interface Sci 1992. [DOI: 10.1016/0021-9797(92)90124-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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16
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Meadows J, Williams P, Garvey M, Harrop R. Enhancement of repulsion forces in polyelectrolyte-stabilized dispersions. J Colloid Interface Sci 1990. [DOI: 10.1016/0021-9797(90)90461-v] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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