Probing effects of polymer adsorption in colloidal particle suspensions by light scattering as relevant for the aquatic environment: An overview

Tiraferri, Alberto; Borkovec, Michal

doi:10.1016/j.scitotenv.2014.11.063

Cited by 25 publications

(21 citation statements)

References 132 publications

(194 reference statements)

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“…SOD adsorption was quantified and the obtained biohybrid was studied by TEM, SEM and by fluorescence and IR spectroscopy. Particle aggregation [53][54][55]58,59 was followed by DLS, where the colloidal stability as a function of salt and polyelectrolyte concentration was investigated, while electrophoresis was used to probe the charging behavior of the bare and coated particles. These characterizations were performed in two types of media, namely in NaCl solutions and in phos-phate buffer to test the ion specific effects on the dispersion properties.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and formulation of functional bionanomaterials with superoxide dismutase activity

2017

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Layered double hydroxide (LDH) nanoparticles were prepared and used as solid support for superoxide dismutase (SOD) enzymes. Structural features were studied by XRD, spectroscopic methods (IR, UV-Vis and fluorescence) and TEM, while colloidal stability of the obtained materials was investigated by electrophoresis and light scattering in aqueous dispersions. The SOD quantitatively adsorbed on the LDH by electrostatic and hydrophobic interactions and kept its structural integrity upon immobilization. The composite material showed moderate resistance against salt-induced aggregation in dispersions, therefore, heparin polyelectrolyte was used to improve the colloidal stability of the system. Heparin of highly negative line charge density strongly adsorbed on the oppositely charged hybrid particles leading to charge neutralization and overcharging at appropriate polyelectrolyte loading. Full coverage of the composite platelets with heparin resulted in highly stable dispersions, which contained only primary particles even at elevated ionic strengths. Our results indicate that the developed bionanocomposite of considerable enzymatic function is a suitable candidate for applications, wherever stable dispersions of antioxidant activity are required for instance in biomedical treatments or in chemical manufacturing processes.

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Section: Resultsmentioning

confidence: 99%

“…These phenomena have already been reported in similar LDH-heparin systems 53 and also for other polyelectrolytes in the presence of oppositely charged particles. 58,63,64 The stability ratios show an extremely narrow curve (Fig. 4B).…”

Section: Polyelectrolyte Coatingmentioning

confidence: 98%

Synthesis and formulation of functional bionanomaterials with superoxide dismutase activity

2017

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“…The first row presents data for anionic PAA (1250 kg/mol) as a function of (a) pH in 10 mM salt, (b) salt concentration at pH 4.3, and (c) pH 9.6. The second row presents data for cationic PAH (900 kg/mol) as a function of (d) pH in 10 mM, (e) salt concentration at pH 4 3,. and (f) pH 9.6.LangmuirArticle DOI: 10.1021/acs.langmuir.5b01103…”

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confidence: 99%

Adsorbed Mass of Polymers on Self-Assembled Monolayers: Effect of Surface Chemistry and Polymer Charge

et al. 2015

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The adsorbed mass of polymers on surfaces with different chemistry is presented, and the related adsorption mechanism is discussed. Strong and weak polyelectrolytes of negative and positive charge are studied, as well as an uncharged polymer. Self-assembled monolayers of alkanethiols on gold are used in reflectometry and quartz crystal microbalance (QCM-D) experiments as adsorbing substrates bearing different terminal moieties, namely, methyl, hydroxyl, carboxyl, and amine groups. The various polymer-surface combinations allow the systematic investigation of the role of surface chemistry and polymer charge on adsorbed amount. Interactions of different nature and range drive polymer adsorption: the measured adsorbed amounts reveal information about their relative contribution. When electrostatic chain-surface attraction is present, the largest adsorbed masses are observed. However, significant mass is measured even when an electrostatic barrier to adsorption is present, suggesting the importance of forces of nonelectrostatic origin, which include both hydrophobic interactions and specific forces acting at short distances. This mechanism results in large adsorbed amounts for the adsorption of weak polyelectrolytes, and it is apparent especially in the adsorption behavior of a neutral polymer.

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“…Hydrogen-bonding attraction is another contribution to the polymer adsorption, and it occurs between the hydroxyl groups on the sand surfaces and the carboxylate groups of polymer molecules. 25 Therefore, the polymer molecules could be adsorbed onto the sand surfaces by virtue of the electrostatic and hydrogen-bonding attractions to form a polymer adsorption layer, which is shown in Figure 4(a). The adsorption type of polymer molecules onto the fracture face followed the adsorption rule of Langmuir; that is, only a single layer of polymer molecules were adsorbed onto the fracture face, and the thickness of the polymer adsorption layer was on the nanometer scale.…”

Section: Resultsmentioning

confidence: 99%

Effect of a polymer on chromium(III) diffusion during gelant injection in fractured media

Bai

Xiong

et al. 2016

J of Applied Polymer Sci

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The effect of a polymer on chromium diffusion during gelant injection into fractured media was explored with a polymer/chromium(III) (Cr 31 ) gelant. The capture and barrier effects are two main affecting mechanisms of polymer molecules on the diffusion of Cr 31 , and the formation of the polymer leak-off layer is a key influencing factor. The experimental results show that when the polymer molecular weight (MW) or concentration increased, both the diffusion rate of Cr 31 and the leak-off degree of the gelant decreased sharply. This resulted in the delayed initial production and advanced final production of Cr 31. Because of the changing diffusion rate of Cr 31 and the dilution effect of brine during gelant injection, the change trends of the Cr 31 production from the fracture outlet and matrix ports reversed after the injection volume exceeded a value; this value was named the critical injected volume. During gelant injection into the fractures, under the effects of gravity action and the disproportionate diffusion of Cr 31, the chromium diffusion profiles measured at the fracture top and bottom were different. The chromium diffusion profile along the matrix varied with increasing gelant injected volume, but it finally reached the diffusion equilibrium state in the matrix. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43447.

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Probing effects of polymer adsorption in colloidal particle suspensions by light scattering as relevant for the aquatic environment: An overview

Cited by 25 publications

References 132 publications

Synthesis and formulation of functional bionanomaterials with superoxide dismutase activity

Synthesis and formulation of functional bionanomaterials with superoxide dismutase activity

Adsorbed Mass of Polymers on Self-Assembled Monolayers: Effect of Surface Chemistry and Polymer Charge

Effect of a polymer on chromium(III) diffusion during gelant injection in fractured media

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