Adsorption of Polyacrylic Acids and Their Sodium Salts on Hydroxyapatite: Effect of Relative Molar Mass

Misra, D.N.

doi:10.1006/jcis.1996.0380

Cited by 53 publications

(41 citation statements)

References 17 publications

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“…In this calculation the conformation was assumed to be linear, with standard bond length and angles [32] used. These values that represent the maximum possible area occupied by the molecules are in good agreement with previous reported results of 29 and 32 nm 2 for similar polyacrylamide copolymers with molecular weights of 7000 and 8300 g/mol, respectively [26], and 9 nm 2 for polyacrylic acid with molecular weight of 5100 g/mol [33].…”

Section: The Surface Coveragesupporting

confidence: 91%

Effects of chemical functional groups on the polymer adsorption behavior onto titania pigment particles

Farrokhpay

Morris

Fornasiero

et al. 2004

Journal of Colloid and Interface Science

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Section: The Surface Coveragesupporting

confidence: 91%

Effects of chemical functional groups on the polymer adsorption behavior onto titania pigment particles

Farrokhpay

Morris

Fornasiero

et al. 2004

Journal of Colloid and Interface Science

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“…9, Curve A), which may be explained on the basis of self-association of the molecules by intermolecular hydrogen bonding. This intermolecular hydrogen bonding may be responsible for the decrease in adsorption at higher concentrations, but this mechanism may not play a significant role for higher molar mass acids, 21 where individual molecules can fold on themselves as intramolecular hydrogen bonding becomes more dominant. Inter-or intra-molecular hydrogen bonding may not play a determining role in the case of the polymeric salts 45 because of coulombic repulsion between highly charged carboxylate groups (Fig.…”

Section: Adsorption Of Polymersmentioning

confidence: 98%

Adsorption from solutions on synthetic hydroxyapatite: Nonaqueous vs. aqueous solvents

Misra¹

1999

J. Biomed. Mater. Res.

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It is useful in restorative dentistry and etiology of bone diseases to know that certain general rules may be derived from a priori considerations of the adsorption of chemicals to synthetic hydroxyapatite (which is the structural prototype of tooth and bone mineral). This article systematically synthesizes the extensive studies on the subject by the author, and rationalizes and extends these rules. Though not a review article, the work of some researchers may not have found an adequate representation here, because they did not determine, in the case of nonaqueous solvents, the reversibility of adsorption; or, in the case of aqueous solvents, the concentration of all constituent ions of the system, thus missing the occurrence of processes other than adsorption. The adsorption of solutes from nonaqueous solvents on hydroxyapatite is mainly regulated by the interplay of hydrogen bonding between adsorbate, adsorbent, and solvent. It does not involve any significant role of ionic nature of the apatite surface, because it is masked by the chemisorbed and physisorbed water. This interplay of hydrogen bonding in conjunction with chemical and structural characteristics of the adsorbed molecules controls their reversibility and the orientation of the adsorbates on the surface. In general, the process may be considered as true adsorption, because no other material exchange process is involved. The "adsorption" of solutes from aqueous solutions generally involves ion-exchange with the apatite surface, and may be affected by the concentrations of potential determining ions (Ca(2+), phosphates, H(+), etc.) in the solution. The solute in aqueous solution may be removed by two other mechanisms, either by formation of a surface complex or by chemically reacting with calcium or phosphate ions to form a new phase that precipitates out of solution. Therefore, the concentration of calcium and phosphate ions in solution should also be monitored to elucidate the mechanism of the process. Adsorption of polymers seems to be determined primarily by their multiple hydrogen bonding, their relative molar mass, and their ability to self-associate. The hydrogen ion concentration plays a decisive role in each one of the above mechanisms.

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“…It is also well established that the accumulation of charge on the substrate is energetically possible due to the existence of some specific bonding between the polymer and the surface. Hydrogen bonds (2), acid-base interactions (3), complexations (4), and hydrophobicity (5,6) have been shown to drive adsorption phenomena. Most of the studies of polyelectrolyte adsorption were made with insoluble substrates (TiO 2 , Al 2 O 3 , etc., polymer lattices) and in some cases the influence of strongly interacting ions (Ca 2ϩ , Ba 2ϩ , Al 3ϩ , SO 4 2Ϫ ) has been investigated.…”

Section: Introductionmentioning

confidence: 99%

Binding and Ion-Exchange Analysis in the Process of Adsorption of Anionic Polyelectrolytes on Barium Sulfate

Balastre

Persello

Foissy

et al. 1999

Journal of Colloid and Interface Science

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Adsorption of Polyacrylic Acids and Their Sodium Salts on Hydroxyapatite: Effect of Relative Molar Mass

Cited by 53 publications

References 17 publications

Effects of chemical functional groups on the polymer adsorption behavior onto titania pigment particles

Effects of chemical functional groups on the polymer adsorption behavior onto titania pigment particles

Adsorption from solutions on synthetic hydroxyapatite: Nonaqueous vs. aqueous solvents

Binding and Ion-Exchange Analysis in the Process of Adsorption of Anionic Polyelectrolytes on Barium Sulfate

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