Adsorption of anionic polyelectrolyte and comb polymers onto lead magnesium niobate

Şakar‐Deliormanlı, Aylin; Çelik, Erdal; Polat, Mehmet

doi:10.1016/j.colsurfa.2007.09.004

Cited by 22 publications

(20 citation statements)

References 25 publications

(41 reference statements)

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“…[10] Previously we have investigated the adsorption behavior of PAA and PAA=PEO onto PMN surface. [22] Results indicated that adsorption increases with decreasing pH for both PAA and PAA=PEO solutions. The adsorption isotherms for PAA at pH 3 was described as high affinity type and characterized by a strong adsorption.…”

Section: Cation Dissolution From Pmn In the Presence Ofmentioning

confidence: 91%

“…On the other hand, the increase in the adsorption of PAA=PEO onto PMN in the presence of monovalent or divalent salt was attributed to the decrease in the electrostatic forces rather than complex formation with the divalent metal ions in solution. [22] Similarly, Vermohlen et al investigated the effect of Ca þ2 on the adsorption of acrylic based polyelectrolytes onto oxide surfaces. It was found that the adsorption is greatly increased by Ca þ2 ions.…”

Section: Dispersing Agents and Perovskites In Watermentioning

confidence: 99%

“…[21] Similarly, effect of PAA and PAA=PEO on the dispersion= flocculation behaviour of aqueous PMN suspensions and their adsorption mechanism onto PMN surface have been well investigated. [18,22] However effect of these dispersing agents on the solubility of PMN was not reported yet. Therefore, the goal of this study was to investigate the influence of PAA and PAA=PEO comb polymers on the stability of PMN=water interface.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Dispersing Agents on the Solubility of Perovskites in Water

Şakar‐Deliormanlı

Çelik

Polat

2009

Journal of Dispersion Science and Technology

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In this study, solubility behavior of lead magnesium niobate (PMN) powders in water was investigated in the presence of pure polyacrylic acid and polyacrylic acid/polyethylene oxide comb polymers. Experiments were performed by measuring the solubility of PMN in terms of the concentration of Pb þ2 and Mg þ2 ions in supernatant as a function of pH and dispersing agent dosage. The concentrations of the metal ions in supernatant were found to be affected by the dispersant concentration, stirring time and the suspension pH. Results revealed that both dispersing agents enhance the cation dissolution from PMN surface at pH 9 due to weak (reversible) adsorption and complexation of Pb þ2 and Mg þ2 by carboxylate groups. On the other hand, under acidic conditions cation dissolution from PMN is inhibited and this was attributed to the strong adsorption of dispersing agents onto the powder surface and formation of a dense polymer layer.

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Section: Cation Dissolution From Pmn In the Presence Ofmentioning

confidence: 91%

Section: Dispersing Agents and Perovskites In Watermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Dispersing Agents on the Solubility of Perovskites in Water

Şakar‐Deliormanlı

Çelik

Polat

2009

Journal of Dispersion Science and Technology

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“…The negatively charged PAA-coated particles are stable under low ionic strength but rapidly aggregate at high ionic strength conditions. This behavior is also closely related with the valence of the ions introduced to the system [37,41].…”

Section: Gelation With Ionic Strength Modificationmentioning

confidence: 96%

Rheological behavior of PMN gels for solid freeform fabrication

Şakar‐Deliormanlı¹,

Çelik²,

Polat³

2008

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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a b s t r a c tLead magnesium niobate (PMN) is a relaxor ferroelectric material and have widespread applications in the manufacture of multilayer electronic devices such as ceramic capacitors, actuators and transducers. The dielectric constant of this electrostrictive material is much higher than the well known ferroelectric barium titanate. However, aqueous processing of PMN is not investigated yet especially for the novel wet shaping fabrication. In this study, concentrated aqueous colloidal PMN gels have been designed to use in the robocasting process. Concentrated PMN suspensions were stabilized by polyacrylic acid and then gelation induced by changing the pH or ionic strength of the suspension or by addition of a cationic polyelectrolyte to the system. Through this procedure it was essential to understand the solid-liquid transition under shear to explore the feasibility of forming without excessive use of polymers. Therefore, rheological response of the samples having a gel network was investigated. Results showed that gelation induced by cationic polyethylene imine or by multivalent salts were successful methods in preparation of PMN gels. However, gelation induced by changing the pH of the suspension was challenging due to ion dissolution from PMN surface.

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“…Therefore, negatively charged PAA group of the comb polymer adsorb onto the PMN surface and creates electrosteric stabilization. 19 Suspensions were ultrasonicated for 2.30 min (550 Sonic Dismembrator, Fisher Scientific) to break up the agglomerates in the system. Then they were ball milled for 24 h to ensure complete adsorption of PAA/PEO onto powder surface at pH 9.…”

Section: Slurry Preparationmentioning

confidence: 99%

Preparation of the Pb(Mg1/3Nb2/3)O3 films by aqueous tape casting

Şakar‐Deliormanlı

Çelik

Polat

2009

Journal of the European Ceramic Society

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Lead magnesium niobate (PMN) is a relaxor ferroelectric material. Because of its high dielectric constant and superior electrostrictive properties it is commonly used in the manufacture of multilayer electronic devices which is typically produced by tape casting. However, preparation of PMN slurry formulations to use in aqueous tape casting process is not investigated in detail yet. Therefore, in this study aqueous PMN formulations were developed for tape casting and its relation with the final properties of PMN films were investigated. The slurries were prepared using poly(acrylic acid)-based comb polymer as the dispersant, nonionic acrylic latex as the binder and the hydroxypropyl methyl cellulose as the wetting agent. The results showed that it is possible to prepare flexible, crack-free PMN films using highly concentrated suspensions without using any plasticizer. The study gives guidelines for the aqueous tape casting of PMN and can be adapted to processing of other multi-component metal oxides.

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Adsorption of anionic polyelectrolyte and comb polymers onto lead magnesium niobate

Cited by 22 publications

References 25 publications

Influence of Dispersing Agents on the Solubility of Perovskites in Water

Influence of Dispersing Agents on the Solubility of Perovskites in Water

Rheological behavior of PMN gels for solid freeform fabrication

Preparation of the Pb(Mg1/3Nb2/3)O3 films by aqueous tape casting

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