Electrosteric Stabilization of Al2O3, ZrO2, and 3Y–ZrO2 Suspensions: Effect of Dissociation and Type of Polyelectrolyte

Pettersson, Alf; Marino, G.; Pursiheimo, Antti; Rosenholm, Jarl B.

doi:10.1006/jcis.2000.6939

Cited by 111 publications

(62 citation statements)

References 24 publications

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“…The variation of solution pH, ionic strength, and divalent cation concentration can result in the conformational change of the surface-immobilised polyelectrolytes, as well as the overall surface charge of the coated particles. [53][54][55] Indeed, the challenge in modelling electrosteric repulsion is that both contributions are interdependent. [52,55] For instance, the degree of polyelectrolyte adsorption and polyelectrolyte conformation are dependent on the electric double layer, while the adsorption of polyelectrolytes itself can influence the double layer.…”

Section: Depositionmentioning

confidence: 99%

Assessing the colloidal properties of engineered nanoparticles in water: case studies from fullerene C60 nanoparticles and carbon nanotubes

Chen¹,

Smith²,

Ball³

et al. 2010

Environ. Chem.

136

114

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Environmental context. The fate and bioavailability of engineered nanoparticles in natural aquatic systems are strongly influenced by their ability to remain dispersed in water. Consequently, understanding the colloidal properties of engineered nanoparticles through rigorous characterisation of physicochemical properties and measurements of particle stability will allow for a more accurate prediction of their environmental, health, and safety effects in aquatic systems.This review highlights some important techniques suitable for the assessment of the colloidal properties of engineered nanoparticles and discusses some recent findings obtained by using these techniques on two popular carbon-based nanoparticles, fullerene C 60 and multi-walled carbon nanotubes.Abstract. The colloidal properties of engineered nanoparticles directly affect their use in a wide variety of applications and also control their environmental fate and mobility. The colloidal stability of engineered nanoparticles depends on their physicochemical properties within the given aqueous medium and is ultimately reflected in the particles' aggregation and deposition behaviour. This review presents some of the key experimental methods that are currently used to probe colloidal properties and quantify engineered nanoparticle stability in water. Case studies from fullerene C 60 nanoparticles and multi-walled carbon nanotubes illustrate how the characterisation and measurement methods are used to understand and predict nanoparticle fate in aquatic systems. Consideration of the comparisons between these two classes of carbonbased nanoparticles provides useful insights into some major current knowledge gaps while also revealing clues about needed future developments. Key issues to be resolved relate to the nature of near-range surface forces and the origins of surface charge, particularly for the reportedly unmodified or 'pure' carbon-based nanoparticles.

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Section: Depositionmentioning

confidence: 99%

Assessing the colloidal properties of engineered nanoparticles in water: case studies from fullerene C60 nanoparticles and carbon nanotubes

Chen¹,

Smith²,

Ball³

et al. 2010

Environ. Chem.

136

114

View full text Add to dashboard Cite

show abstract

“…Conformation of polymer chains (both adsorbed and unadsorbed in the bulk solution) determine the stability of the solid suspension [6][7][8][9][10][11]. Polymer chains adsorbed on the solid particles surface may be responsible for steric stabilization (low molecular weights, high concentrations) or bridging flocculation (high molecular weights, low concentrations) of the suspension.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the alumina properties with adsorbed polyvinyl alcohol

Wiśniewska

Chibowski

Urban

et al. 2010

J Therm Anal Calorim

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The influence of solution pH on the structure of polyvinyl alcohol adsorption layer on the alumina surface was investigated. The spectrophotometry, viscosimetry, thermogravimetry, potentiometric titration and microelectrophoresis were applied in experiments. These methods enable determination of the following parameters: adsorbed amount of PVA, stability of suspension without and with polymer, thickness of its adsorption layers, changes in thermal characteristics of Al 2 O 3 surface with the adsorbed polymer, surface charge density and zeta potential of solid particles in the presence and absence of PVA, respectively. All measurements were carried out in the pH range 3-9. The obtained results indicate that pH has a great influence on the conformation of PVA chains adsorbed on the alumina surface. It is due to incomplete hydrolysis of acetate groups of polyvinyl alcohol macromolecules (degree of hydrolysis 97.5%), which dissociate with the increasing pH. Moreover, the polymer adsorption on the alumina surface causes changes in the course of thermogravimetric curves. The effect of weight loss for Al 2 O 3 -PVA systems is smaller than that of Al 2 O 3 without polymer. It is due to elimination of water molecules from the solid surface by adsorbed polymer.

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“…45,46 This can be attributed to the partial charge of the metal particles surface which is benecial for coulomb interactions between the particle and the polar IL (electrosteric shielding). 47,48 Microwave synthesis of NiO and ZnO nanoparticles NiO-and ZnO-nanoparticles could be obtained both in n-Bu 4 POAc from nickel carbonate hexahydrate (NiCO 3 $6H 2 O) and zinc carbonate (ZnCO 3 ), and in bmmim NTf 2 from zinc acetate dihydrate (Zn(OAc) 2 $2H 2 O). Due to a better dispersibility of nickel acetate in 1-butyl-3-methylimidazolium N,N-bis(triuoromethylsulfonyl)imid (bmim NTf 2 ), the NiO particles are synthesised in the latter.…”

Section: Resultsmentioning

confidence: 99%

Fast track to nanomaterials: microwave assisted synthesis in ionic liquid media

et al. 2014

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Herein we present a general approach to metal and metal oxide nanoparticles using simple metal salts as starting materials. The reducing agent can be delivered in the form of the anion incorporated into the metal precursor respectively ionic liquid. Exemplary we demonstrate the synthesis of Cu and Ag as well as ZnO and NiO nanoparticles generated either from acetate or carbonate salts. All particles are synthesised by microwave heating without the necessity of inert conditions. Two different types of ionic liquids have been used as reaction media -tetra-n-butylphosphonium acetate (n-Bu 4 POAc) and 1-butyl-2,3-dimethylimidazolium N,N-bis(trifluoromethylsulfonyl)imid (bmmim NTf 2 ). In this case, the choice of the ionic liquid seems to have significant influence on the size, shape and dispersity of the synthesised particles. It is clearly shown that the acetate anion present in all reaction mixtures can act as an inexpensive and nontoxic reducing agent. The final products in solid, liquid and gaseous phase have been characterised by XRD, TEM, NMR, FT-IR and online gas-phase MS.

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Electrosteric Stabilization of Al2O3, ZrO2, and 3Y–ZrO2 Suspensions: Effect of Dissociation and Type of Polyelectrolyte

Cited by 111 publications

References 24 publications

Assessing the colloidal properties of engineered nanoparticles in water: case studies from fullerene C60 nanoparticles and carbon nanotubes

Assessing the colloidal properties of engineered nanoparticles in water: case studies from fullerene C60 nanoparticles and carbon nanotubes

Investigation of the alumina properties with adsorbed polyvinyl alcohol

Fast track to nanomaterials: microwave assisted synthesis in ionic liquid media

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