Surface-Chemical Criteria for Optimum Adhesion

Kitazaki, Yasuaki; Hata, Toshio

doi:10.1080/00218467208072217

Cited by 125 publications

(78 citation statements)

References 19 publications

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“…For the solids examined here, these interactions may contribute to %"; however, only those interactions that are encountered in both contacting phases contribute to interracial free energy (Kitazaki and Hata, 1972). Therefore, in the systems solid-water drop-hydrocarbon and solid-water drop-air, the largest contributions to interracial free energy of solid-water are from interactions such as dispersion, induced dipole-dipole, dipole-dipole, and hydrogen bonding.…”

Section: Resultsmentioning

confidence: 98%

Components of Surface Free Energy of Some Clay Minerals

Jańczuk

1988

Clays and clay miner.

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Abstract--The wetting contact angle was measured for water drops settled on the surface of pressed discs of kaolinite, alumina, bentonite, marble, montmorillonite, and quartzite immersed in hexane, octane, dodecane, cis-decalin, and air. Minimum and maximum values of the contact angle were obtained for the given systems of solid-water drop-hydrocarbon, depending on the manner of disc preparation. Using both minimum (0min) and maximum (0m~x) values of the contact angle, values of the dispersion component (3,s ~) of surface free energy of these solids were calculated from the equation which was derived on the basis of an equilibrium state of the system solid-water drop-hycrocarbon for two different hydrocarbons. The values of3,s ~ for kaolinite, alumina, bentonite, marble, montmorillonite, and quartzite obtained from Oma, are 83.5, 98.1, 98.9, 80.2, 95.9, and 89.7 mJ/m 2, and from Om~x are 73. 1, 85.0, 84.4, 75.8, 85.5, and 75.5 mJ/m 2. These values for marble and quartzite are similar to those in the literature (marble = 67.7 mJ/ma; quartzite = 71.3 and 76.0 m J/m2). The values of the dispersion components of surface free energy for marble and quartzite covered with a water film (q, sf a) were found to be: 41.8, 36.9; 49.2, 42.5; 49.6, 42.2; 40.2, 38.1; 48.1, 42.8; and 44.9, 38.0 mJ/m 2, respectively. Values of ~/s~ for kaolinite, bentonite, and montmorillonite agreed well with those obtained from hydrocarbon adsorption isotherms determined by differential thermal analysis (35.5, 36.5, and 37.4 mJ/m2).Using values of ~/sf ~ and contact angles measured in the system solid-water drop-air, the nondispersion component of the surface free energy of solids with adsorbed water film (~sr n) was calculated from the modified Young equation. The values of ~sf" for kaolinite and quartzite are as follows: 55.8, 69.0; 85.6, 94.0; 52.1, 75.0; 64.7, 68.9; 54.9, 71.3; and 59.2, 74.4 mJ/m z. The values of the nondispersion components determined for kaolinite, bentonite, and montmorillonite agreed well with those obtained by differential thermal analysis (67.6, 78.3, and 65.5 mJ/m 2, respectively). Further, based on the assumption that the adsorbed water film decreased the surface free energy of these solids by the value of the work of spreading wetting, the nondispersion component ('ys n) of the surface free energy of the solids was calculated to be: 86.9, 129.6; 169.5,187.7; 67.1,144.8; 117.5,129.3; 83.0, 135.7 and 100.2, 143.4 mJ/m 2. These calculated values of the nondispersion component of marble and quartzite surface free energy agree with those obtained from adsorption isotherms determined by chromatographic and differential thermal analysis (marble = 103.8, 106.4; quartzite = 112, 115, 153.6 mJ/m2).

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Section: Resultsmentioning

confidence: 98%

Components of Surface Free Energy of Some Clay Minerals

Jańczuk

1988

Clays and clay miner.

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“…On the other hand, according to the thermodynamic rules such condition is fulfilled if the solid-solution interface tension is equal to zero and when the surface tension of solution and solid is the same [2]. However, as follows from for example [20,21] in the case of aqueous solutions of surfactants the critical surface tension of solid wetting is somewhat higher or considerably lower than the solid surface tension and in many cases it depends on the kind of surfactant added to water. Such behaviour of aqueous solution of surfactants in the wetting process is caused on one hand by the changes of the solid-solution interface tension, which strongly depends on the orientation of surfactant molecules in the surface layer at the solid-solution interface different from that at the solution-air interface.…”

Section: (Ptfe)mentioning

confidence: 99%

Wetting properties of the sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and polyoxyethylene (23) lauryl ether (Brij 35) binary mixtures in the poly(tetrafluoroethylene)-solution-air system

Krawczyk

2015

Annales UMCS, Chemia

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Wettability of poly(tetrafluoroethylene) (PTFE) by aqueous solutions of binary mixtures composed of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) with polyoxyethylene (23) lauryl ether (Brij 35) was considered on the basis of the measured values of contact angle and surface tension. It was shown that the value of the critical surface tension of PTFE surface wetting at the studied system (23.5 mN/m), does not depend on the concentration and composition of the binary mixtures of studied surfactants in water, and it was higer than the surface tension of PTFE (20.2 mN/m). The best wettability of polytetrafluoroethylene (PTFE) by studied aqueous solutions of binary surfactants mixtures occurs at the mixtures concentration corresponding to the critical micelle concentration of their solutions.

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“…The surface tension (gS) of poly(dimethylsiloxane) and the surface tension (gL) of water are described in the references. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The contact angle (q) with water of poly(dimethylsiloxane) was measured in the same manner as shown in Fig. 3, in which laser scanning microscopic photography and FT-IR 2D-imaging was used.…”

Section: The F Coefficient For the Estimation Of Contact Anglementioning

confidence: 99%

An Interpretation of Alternative Plugs Flow Liquid Chromatography in a Slightly Modified GC/MS System

Tanikawa¹,

Konuma

Hosono

et al. 2009

ANAL. SCI.

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Alternative plugs flow liquid chromatography (APFLC), a type of gas-liquid two-phase flow chromatography (2PFC) is achieved by the agglomeration of unformed condensates in an open tubular capillary column with intermittently alternating condensates in which the supply of the liquid is maintained at a level that provides a hypothetical homogeneous film, 25 to 150 nm thick, on the inner surface. To support stable plugs, the flow mode should normally be maintained at a liquid-to-gas volume ratio (b) of between 0.0006 and 0.004 and below 70˚C. Alternative plugs flow is formed as a result of the hydrophobic property of the stationary phase, which is induced at a water contact angle above 75˚, as derived from the solubility parameter (d) of a coated resin of less than 18.3 MPa 1/2 . Diffusion and mixing between the vicinal partition fields is substantially avoided in alternating disconnected nano-volume plugs, which makes it possible to obtain a very large number of theoretical plates of separation. The plugs flow as a mobile phase can be enhanced by applying sonic vibrations to the column. Since the liquid/gas phases ratio (b) is maintained in the range of 10 -4 to 10 -3 , the extremely small volumes of solvent offer the advantages of compatibility with an EI-ionizing mass spectrometer and the use of commercially available mass search systems. The APFLC/EI-MS system, which employs commercially-available GC/MS equipment, is potentially applicable to both GC and LC analysis containing sparingly volatile components, giving close to the theoretical resolution and eliminating the need for numerous derivatization procedures.

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Surface-Chemical Criteria for Optimum Adhesion

Cited by 125 publications

References 19 publications

Components of Surface Free Energy of Some Clay Minerals

Components of Surface Free Energy of Some Clay Minerals

Wetting properties of the sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and polyoxyethylene (23) lauryl ether (Brij 35) binary mixtures in the poly(tetrafluoroethylene)-solution-air system

An Interpretation of Alternative Plugs Flow Liquid Chromatography in a Slightly Modified GC/MS System

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