Interfacial Lifshitz-van der Waals and polar interactions in macroscopic systems

Oss, Carel J. van; Chaudhury, Manoj K.; Good, Robert J.

doi:10.1021/cr00088a006

Cited by 2,193 publications

(1,542 citation statements)

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“…This led to differences in the acid/base parts of the surface free energies and therefore also in the total surface free energies. The lower values of 7t,,, compared with 7b were owing to the fact that in the method of van Oss et al (17,18), the spreading pressure (~e) is considered to be zero.…”

Section: Microbial Adhesion To Hydrocarbon (Math)mentioning

confidence: 99%

“…This approach has proven to be valid for low energy surfaces and for high energy surfaces on which spreading pressures may become significant (16). The second approach has been developed by Van Oss et al (17,18) who extended Eq. 1 in an attempt to obtain data from contact angles that would give more information about the polar groups at a surface.…”

Section: Contact Angles and Surface Free Energiesmentioning

confidence: 99%

“…Surface free energies were calculated according to the methods of Busscher et al (13) and Van Oss et al (17,18). There is a good linear relation (r ---0.97) between the polar component (~') of the surface free energy according to Busscher et al (13) and the electron-donor part (yz) of the acid/base component of the surface free energy according to van Oss et al (17,18) (Fig.…”

Section: Cell Biophysicsmentioning

confidence: 99%

“…2. Relation between the electron-donor parameter (y-) of the surface free energy of the eight E. coli strains based on the concept of Lifshitz-van der Waals and acid/base surface free energy components (17,18), and the polar part (TP) of the surface free energy based on the concept of dispersion and polar surface free energy components (13). Fig.…”

Section: Cell Biophysicsmentioning

confidence: 99%

“…3. Relation between the acid/base component of the surface free energy of the eight E. coli strains based on the concept of Lifshitz-van der Waais and acid/base surface free energy components (17,18), and the zeta potentials at pH = 7.4. from 0.026 to 0.085 (Table 4). The AmI/CH ratio as determined with IR varied more than the AmII/CH ratio possibly because of differences in the content of unsaturated aldehydes and ketones in the cell wall causing fluctuations in the AmI/CH ratio, but not in the AmII/CH ratio.…”

Section: Cell Biophysicsmentioning

confidence: 99%

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Physicochemical characterization ofEscherichia coli

et al. 1992

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Eight Escherichia coli strains were characterized by determining their adhesion to xylene, surface free energy, zeta potential, relative surface charge, and their chemical composition. The latter was done by applying X-ray photoelectron spectroscopy (XPS) and infrared spectroscopy OR). No relationship between the adhesion to xylene and the water contact angles of these strains was found. Three strains had significantly lower surface free energies than the other strains. Surface free energies were either obtained from polar and dispersion parts or from Lifshitz-van der Waals and acid/base parts of the surface free energy. A correlation (r = 0.97) between the polar parts and the electron-donor contributions to the acid/base part of the surface free energy was found. The zeta potentials of all strains, measured as a function of pH *Author to whom all correspondence and reprint requests should be addressed. Cell Biophysics 1 7Volume 20, 1992 18Harkes et al.(2-11), were negative. Depending on the zeta potential as a function of pH, three groups were recognized among the strains tested. A relationship (r = 0.84) was found between the acid/base component of the surface free energy and the zeta potential measured at pH = 7.4. There was no correlation between results of XPS and IR studies. Data from the literature of XPS and IR studies of the gram-positive staphylococci and streptococci were compared with data from the gram-negative E. coli used in this study. It appeared that in these three groups of bacteria, the polysaccharide content detected by IR corresponded well with the oxygen-to-carbon ratio detected by XPS.

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Section: Microbial Adhesion To Hydrocarbon (Math)mentioning

confidence: 99%

Section: Contact Angles and Surface Free Energiesmentioning

confidence: 99%

Section: Cell Biophysicsmentioning

confidence: 99%

Section: Cell Biophysicsmentioning

confidence: 99%

Section: Cell Biophysicsmentioning

confidence: 99%

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Physicochemical characterization ofEscherichia coli

et al. 1992

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Surface free-energy analysis of energetic poly(glycidyl azide) networks prepared by different reactive systems

Doğan

Eroğlu

Erbil

1999

J. Appl. Polym. Sci.

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Change in the surface free energy of poly(glycidyl azide) (PGA) networks prepared with different reactive systems was investigated using the van Oss‐Good contact‐angle evaluation methodology in order to estimate their wettability properties. The apolar Lifshitz–van der Waals (LW) component of the surface free energy of these energetic PGA networks was found to differ only in a minor amount and an average γ LWitalicS = 32.2 mJ m−2 was calculated. The network surface was found to be monopolar and basic (electron donor) in varying degrees in accordance with change of the network bulk structure, mainly due to the presence of oxygen atoms in the PGA chain. The set of the network containing only PGA and Desmodur N‐100 components showed the highest γ −italicS values compared to the other two sets. The main γ −italicS contribution was found to come from the PGA polymer. A slight decrease of the γ −italicS component was seen when the Desmodur N‐100 component was substituted with hexamethylene diisocyanate (HMDI); however a large decrease was seen when Desmodur N‐100 was substituted with the isophorone diisocyanate (IPDI) component. This large reduction in the surface basicity of the network was due to increase of the apolar IPDI groups at the surface having low surface tension and also due to decrease of the oxygen atoms belonging to the main chain of PGA at the surface, which resulted in the minimization of the network's basic surface free‐energy component. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 2848–2855, 1999

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