Evaluation of the calcium oxalate monohydrate Hamaker constant based on static dielectric constant determination and electronic polarization

Craig F. Habeger, Chris E. Condon, Saeed R. Khan, James Hansell Adair

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Knowledge of the static dielectric constant is fundamental to an accurate calculation of the Hamaker constant. However, many materials of interest, particularly biominerals, do not lend themselves to a form amenable to measure dielectric properties readily. In the current work, it is shown that careful preparation of composite samples composed of the biomineral, in the current work, calcium oxalate monohydrate (COM) well-dispersed in a low dielectric constant silicon rubber, permit determination of the static dielectric constant of the biomineral phase. Composite mixing rules were used to deconvolute the dielectric constant of COM from the COM/silicone composite. Utilizing the Lichtenecker dielectric mixing model, the value of the static dielectric constant of COM was determined to be 28.9. Optical and dielectric data were then used in the Tabor-Winterton relationship to calculate the Hamaker constant A131 of COM particles interacting in water. The A131 for COM as a function of crystallographic habit was also examined. The mean value of A131 for COM was calculated to be 13.7(±5.90) × 10-21 J at 37°C in an aqueous environment, which is about 15% larger than previously published values calculated using only contributions from electronic polarization between interacting materials.

Original languageEnglish (US)
Pages (from-to)13-21
Number of pages9
JournalColloids and Surfaces B: Biointerfaces
Volume10
Issue number1
DOIs
StatePublished - Oct 31 1997

Fingerprint

Calcium Oxalate
oxalates
calcium
Calcium
Permittivity
Polarization
permittivity
evaluation
polarization
electronics
composite materials
Composite materials
habits
Rubber
silicones
Silicon
Silicones
rubber
Dielectric properties
Habits

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

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title = "Evaluation of the calcium oxalate monohydrate Hamaker constant based on static dielectric constant determination and electronic polarization",
abstract = "Knowledge of the static dielectric constant is fundamental to an accurate calculation of the Hamaker constant. However, many materials of interest, particularly biominerals, do not lend themselves to a form amenable to measure dielectric properties readily. In the current work, it is shown that careful preparation of composite samples composed of the biomineral, in the current work, calcium oxalate monohydrate (COM) well-dispersed in a low dielectric constant silicon rubber, permit determination of the static dielectric constant of the biomineral phase. Composite mixing rules were used to deconvolute the dielectric constant of COM from the COM/silicone composite. Utilizing the Lichtenecker dielectric mixing model, the value of the static dielectric constant of COM was determined to be 28.9. Optical and dielectric data were then used in the Tabor-Winterton relationship to calculate the Hamaker constant A131 of COM particles interacting in water. The A131 for COM as a function of crystallographic habit was also examined. The mean value of A131 for COM was calculated to be 13.7(±5.90) × 10-21 J at 37°C in an aqueous environment, which is about 15{\%} larger than previously published values calculated using only contributions from electronic polarization between interacting materials.",
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Evaluation of the calcium oxalate monohydrate Hamaker constant based on static dielectric constant determination and electronic polarization. / Habeger, Craig F.; Condon, Chris E.; Khan, Saeed R.; Adair, James Hansell.

In: Colloids and Surfaces B: Biointerfaces, Vol. 10, No. 1, 31.10.1997, p. 13-21.

Research output: Contribution to journalArticle

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