An equation-of-state approach to determine surface tensions of low-energy solids from contact angles

Neumann, A. W.; Good, Robert J.; Hope, Christopher J.; Sejpal, M

doi:10.1016/0021-9797(74)90365-8

Cited by 647 publications

(259 citation statements)

References 13 publications

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“…5 and 6. It is in contrast to the suggestions of Neumann et al (1974) and in accordance to the other investigators (Jańczuk and Białopiotrowicz 1989;van Oss 1994). It is interesting that the minimum of the contact angle occurs at the concentration of the surfactant mixture equal to 1 9 10 -6 M and the mole fraction of TX-100 equal to 0.2, at the constant surface tension of the solution.…”

Section: Contact Angle Isothermssupporting

confidence: 80%

Adsorption of Triton X-100 and cetyltrimethylammonium bromide mixture with ethanol at nylon-6–solution interface with regard to nylon-6 wettability: I. The effect of adsorption on critical surface tension of nylon-6 wetting

2013

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The contact angle measurements of the aqueous solutions of p-(1,1,3,3-tetramethylbutyl)phenoxypoly(ethylene glycol) (TX-100) and cetyltrimethylammonium bromide (CTAB) mixture with ethanol on nylon-6 were made in the range of the total concentration of CTAB and TX-100 mixture from 1 9 10 -6 to 1 9 10 -3 M and ethanol from 0 to 17.13 M. In the CTAB and TX-100 mixture the mole fraction of TX-100 was equal to 0; 0.2; 0.4; 0.6; 0.8 and 1. On the basis of the obtained results, the critical surface tension of nylon-6 wetting was determined from the dependence of cosine of contact angle and the adhesion tension as a function of the surface tension of the solution. This tension was compared to the components and parameters of nylon-6 surface tension taken from literature and discussed in the light of the surface excess concentration of the surface active agents at the nylon-6-solution interface calculated from the Lucassen-Reynders equation and the Gibbs isotherm.

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Section: Contact Angle Isothermssupporting

confidence: 80%

Adsorption of Triton X-100 and cetyltrimethylammonium bromide mixture with ethanol at nylon-6–solution interface with regard to nylon-6 wettability: I. The effect of adsorption on critical surface tension of nylon-6 wetting

2013

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“…P a n e l s w e r e air d 9 There are different concepts referring to surface tension. The present study uses the concept of surface free energy, at interfaces (y,,., s = solid, v = vapor; see Neumann et al, 1974) like Absolom et al (1983), Fletcher & Pringle 11985) and van Pelt et al (1985). Another concept which will be of some relevance in that study is the concept of critical surface tension ('f~, see Zisman, 1964).…”

Section: Materials a N D M E T H O D Smentioning

confidence: 92%

Influence of initial substratum surface tension on marine micro- and macro-fouling in the Gulf of Thailand

Becker

Siriratanachai

Hormchong

1998

Helgoländer Meeresunters.

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The density of five major groups at fouling organisms Ibacteria, diatoms, choanotlagellates, ciliates, macroorganisms) on seven artilicial substrata with surface tensions between 19.0 and 64.5 mN m ' was studied in the Gulf at Thailand. Two series of test panels r the different substrata were immersed into the sea between 3 hours and 64 days (macrotauna 128 days). The results show that surface tension has ,t limited impact on the density of the organisms. Only bacteria settled conlinuously in signilicantly lower numbers on materials within the minimum bioadheslw2 range (20-25 mN m ') than on other substrata. Signifi(:dn[ differences between the substrata may disappear after long exposure, as in series 2 after 16days For diatoms and protozoa, a colonisation pattern similar to thdt of bacteria with a minimum ol 20-25 mN m : was detected alter severdl exposure intervals, l.lowever, it was never recor(ted m more than 3 exl)osure intervals in a row. The colonisation pattern of macroorganisms could not be attributed Io substratum surface tension. An index, called "colonisation degree" is introduced to give a gene.~ral impression at the density of organisms on the materials tested. The colonisation degree did not show any signilicant difference at any exposure interval. The present results clearly suggest that substratum surface tension is easily overshadowed by other factors in colonisation processes under natural conditions.

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“…Cassie-Baxter theory (Cassie, 1944) describes the overall CA of such composite surfaces. The measured data allow the calculation of the surface free energy values using Neumann's (disputed) equations of state (Neumann, 1974). Zisman's method can also be used (Zisman, 1963) in which the surface is characterised by its critical surface tension.…”

Section: Study and Characterization Of Nanolayersmentioning

confidence: 99%

The use of nano-/microlayers, self-healing and slow-release coatings to prevent corrosion and biofouling

Telegdi

Szabó

Románszki

et al. 2014

Handbook of Smart Coatings for Materials Protection

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The mitigation of corrosion and biofouling is a challenge. Through application of chemicals and special techniques can slow these undesired processes, an effective resolution requires a multidisciplinary approach involving scientists, engineers, and metallurgists. In order to understand the importance of the use of nano-and microlayers as well as selfhealing coatings, the basic concepts of corrosion, corrosion mechanisms, corrosion inhibition and the microbiologically influenced corrosion will be summarised. The preparation, characterization and application of Langmuir-Blodgett and self assembled nanolayers in corrosive and microbial environment will be discussed. Preparation and characterization of microcapsules/ microspheres and their application in coatings will be demonstrated by a number of examples.Keywords: nano-and microcoating, self-healing, slow-release, anticorrosion, antifouling IntroductionCorrosion is a well-known problem all over the world. It consumes a significant part of the gross national product (GDP) of developed and developing countries. A number of authors have provided comprehensive introductions to corrosion mainly in aqueous and wet environments (Jones, 1991;Kaesche, 2003; McCafferety, 2010). Corrosion is the destructive result of the chemical/electrochemical reactions between metals and the environment. Corrosive reactions involve water in either liquid or condensed phases. Most corrosion reactions are electrochemical processes. These involve electron or charge transfer in aqueous solution which leads to metal dissolution (anodic reaction). Depending on the pH of the solution, either hydrogen or hydroxonium ions evolve, resulting in oxides, oxyhydroxides, hydroxides and salts formed on the metal surface (cathodic reaction). The electrochemical potential or electron activity affects the rate of corrosion reaction. To understand corrosion it is necessary to discuss briefly the types of corrosion and the reactions involved.Corrosion occurs in various forms.-Uniform corrosion: The metal surface must be compositionally uniform; the aggressive environment has the same access to all parts of the metal. This type of

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An equation-of-state approach to determine surface tensions of low-energy solids from contact angles

Cited by 647 publications

References 13 publications

Adsorption of Triton X-100 and cetyltrimethylammonium bromide mixture with ethanol at nylon-6–solution interface with regard to nylon-6 wettability: I. The effect of adsorption on critical surface tension of nylon-6 wetting

Adsorption of Triton X-100 and cetyltrimethylammonium bromide mixture with ethanol at nylon-6–solution interface with regard to nylon-6 wettability: I. The effect of adsorption on critical surface tension of nylon-6 wetting

Influence of initial substratum surface tension on marine micro- and macro-fouling in the Gulf of Thailand

The use of nano-/microlayers, self-healing and slow-release coatings to prevent corrosion and biofouling

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