Cationic polyvinylamine binding to anionic microgels yields kinetically controlled structures

Wen, Quan; Vincelli, Andrew M.; Pelton, Robert

doi:10.1016/j.jcis.2011.12.035

Cited by 15 publications

(29 citation statements)

References 28 publications

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“…Monodispersity has been improved by first synthesising a microgel based on one polymer, then adding the second polyelectrolyte later. For example, anionic PNIPAM microgels, whose composition and size distribution can be carefully controlled, have been subsequently complexed with cationic PVAm to give a stable, colloidal suspension of monodisperse spheres (Wen et al 2012). Gelatin-OSA starch hydrogel particles have also been fabricated by simply mixing aqueous solutions and acidifying the mixture to pH 5, where it was shown again that the cation:anion ratio has an effect on particle size and polydispersity.…”

Section: Complex Formationmentioning

confidence: 99%

Advances in the use of microgels as emulsion stabilisers and as a strategy for cellulose functionalisation

2020

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Microgel particles have recently emerged as an alternative route to emulsion stabilisation. Classed as soft colloidal particles, their ability to swell to differing degrees in certain solvents and to rearrange once attached to an interface makes them highly suitable for systems requiring long-term stabilization, such as formulations in the food, agricultural, cosmetic and pharmaceutical industries. Microgels made with biocompatible polymers such as proteins and polysaccharides in particular offer an environmental advantage and currently form a very active area of research. Cellulose, being a natural, biodegradable polymer, is an attractive ingredient for gels and microgels. However, its use as a functional material is often somewhat hindered by its insolubility in water and most other organic solvents. Furthermore, the surface activity of cellulose has proven difficult to harness and therefore its ability to act as an emulsion stabiliser has been almost exclusively applied to oil-in-water (O/W) emulsions, with very few reports on its water in oil (W/O) activity. This review aims to summarise some of the recent progress made in the microgel field including their ability to act as emulsion stabilisers, with a focus on cellulose microgels (CMGs). A brief overview of cellulose processing is also given, describing the dissolution and reprecipitation routes used to functionalise cellulose without covalent modification and the potential for cellulose particles and CMGs to act as O/W and W/O emulsion stabilisers. Graphic abstract

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Section: Complex Formationmentioning

confidence: 99%

Advances in the use of microgels as emulsion stabilisers and as a strategy for cellulose functionalisation

2020

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“…(2) A second explanation assumes that the process has substantial irreversible character Wen et al 2012). In other words, one makes the assumption that the polyelectrolytes are sufficiently large and interactive so that they become trapped into non-equilibrium conformations, depending on the details of the adsorption process.…”

Section: Effects Of Polyelectrolyte Bulk Concentrationmentioning

confidence: 99%

“…a "gel"), the charge properties and other attributes of which can be modified by treatment with a lesser amount of highcharge cationic polyelectrolyte (Wen et al 2012). Such structures were shown to provide substantial adhesion in papermaking applications, even in the wet state (Wen and Pelton 2012a,b).…”

Section: When To Incorporate Polyelectrolyte Complexes (Pecs) Into Thmentioning

confidence: 99%

Dissolved and Colloidal Substances (Dcs) and the Charge Demand of Papermaking Process Waters and Suspensions: A Review

et al. 2012

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Dissolved and colloidal substances (DCS) in the process waters of paper machine systems can interfere with the retention of fine particles, retard the drainage of water from the wet web, and generally hurt the intended functions of various polyelectrolytes that are added to the process. This review considers publications that have attempted to characterize the nature and effects of different DCS fractions, in addition to some of the ways that paper technologists have attempted to overcome related problems. The consequences of DCS in a paper machine system can be traced to their ability to form complexes with various polyelectrolytes. Such tendencies can be understood based on a relatively strong complexing ability of multivalent materials, depending on the macromolecular size and charge density. Continuing research is needed to more fully understand the different contributions to cationic demand in various paper machine systems and to find more efficient means of dealing with DCS.

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“…However, the application of anionic pH-sensitive polymer is limited to cancer therapy because of the low-pH (approximately 5.7) conditions associated with tumors. Thus, it is quite essential to use cationic pH-sensitive polymers with amino groups that can swell under acidic conditions [14].…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of cationic pH-sensitive SiO2/polymer core-shell nanoparticles with amino groups in the shell

Cheng

Wang

et al. 2014

Colloid Polym Sci

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Silica/poly(styrene-N,N′-dimethylaminoethyl methacrylate) (SiO 2 /P(St-DMAEMA)) cationic pHresponsive core-shell particles with a narrow size distribution and diameter of less than 200 nm were synthesized by emulsion polymerization. The effects of the St/DMAEMA molar ratio, SiO 2 core size, monomer amount, and cross-linking degree on the morphology and pH-responsiveness of the core-shell particles were investigated by transmission electron microscopy, dynamic light scattering, and conductometric titration. The results showed that core-shell particles with only one SiO 2 core could be obtained when the cross-linker divinyl benzene (DVB) was used, and the diameter of the core-shell particles increased with the size of the SiO 2 core and the total amount of monomer. It was observed that the amount of surface amino groups, zeta potential, and volume swelling ratio of the core-shell particles were significantly affected by the St/DMAEMA molar ratio, and a high volume swelling ratio was achieved at pH 4 and a DVB content of 3 mol%. The zeta potential was observed to be a function of pH, and the particles were positively charged when the pH value was below approximately 7.2.

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Cationic polyvinylamine binding to anionic microgels yields kinetically controlled structures

Cited by 15 publications

References 28 publications

Advances in the use of microgels as emulsion stabilisers and as a strategy for cellulose functionalisation

Advances in the use of microgels as emulsion stabilisers and as a strategy for cellulose functionalisation

Dissolved and Colloidal Substances (Dcs) and the Charge Demand of Papermaking Process Waters and Suspensions: A Review

Preparation and characterization of cationic pH-sensitive SiO2/polymer core-shell nanoparticles with amino groups in the shell

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