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Volumn 13, Issue 26, 1997, Pages 7106-7114

Influence of van der Waals forces from metallic substrates on fluids supported on self-assembled monolayers formed from alkanethiols

Author keywords

[No Author keywords available]

Indexed keywords

CONTACT ANGLE; COPPER; GOLD; MOLECULAR STRUCTURE; PARAFFINS; SILICA; SILVER; SULFUR COMPOUNDS; VAN DER WAALS FORCES;

EID: 0031359807     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la970621e     Document Type: Article
Times cited : (81)

References (88)
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    • unpublished results
    • 3have noted that, "The lower hydrophobicities of monolayers prepared from shorter alkanethiols (m < 9) have been rationalized ... by assuming disordering of the shorter chain adsorbates and interaction of the probe liquid with the underlying substrate."
    • Chaudhury, M.1
  • 23
    • 5244307305 scopus 로고    scopus 로고
    • unpublished results
    • 3have noted that, "The lower hydrophobicities of monolayers prepared from shorter alkanethiols (m < 9) have been rationalized ... by assuming disordering of the shorter chain adsorbates and interaction of the probe liquid with the underlying substrate."
    • Chau, L.K.1    Porter, M.D.2
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    • note
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    • note
    • 3SH. This phase subsequently crystallizes into a (p ×√3)R30° "pinstripe" phase in which the alkyl chains are less than closely packed. Desorption of either thiols or contaminants was proposed to accompany the transformation of the 2-D liquid phase to the p×√3 structure.29,31,32
  • 47
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    • note
    • 23b,25
  • 51
    • 0003942491 scopus 로고
    • Harcourt Brace Jovanovich: San Diego, CA
    • (b) Hamburg, M. Basic Statistics, 2nd ed.; Harcourt Brace Jovanovich: San Diego, CA, 1979.
    • (1979) Basic Statistics, 2nd Ed.
    • Hamburg, M.1
  • 59
    • 5244256610 scopus 로고    scopus 로고
    • note
    • The form of the theory of Lifshitz used by us assumes planar, smooth surfaces and requires specification of the distance (d in (4)) between the interacting "slabs" of materials. For materials "in contact", the graininess of the materials makes this physical picture questionable. The distance d also has atomic dimensions for materials "in contact" and thus any prediction is highly dependent on the value assumed for d.
  • 60
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    • note
    • 2 (using Young's equation). The geometric mean does, therefore, provide a good estimate of WSAM-HD in this system .
  • 61
    • 5244350829 scopus 로고
    • Berg, J. C., Ed.; Marcel Dekker, Inc.: New York
    • Berg, J. C. In Wettability; Berg, J. C., Ed.; Marcel Dekker, Inc.: New York, 1993; pp 1-73.
    • (1993) Wettability , pp. 1-73
    • Berg, J.C.1
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    • Fowkes, F. M., Ed.; Academic Press: New York
    • Fowkes, F. M. In Hydrophobic Surfaces; Fowkes, F. M., Ed.; Academic Press: New York, 1969; pp 151-163.
    • (1969) Hydrophobic Surfaces , pp. 151-163
    • Fowkes, F.M.1
  • 67
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    • A recent report has concluded that the index of refraction of SAMs decreases from 1.44 for m = 19 to 1.33 for m = 11 (see Ehler, T. T.; Malmberg, N.; Noe, L. J. J. Phys. Chem. B 1997, 101, 1268-1272). We have investigated the possible effect of the change in refractive index on our predictions using Lifshitz theory. A change in the refractive index of a SAM (for m = 5) from 1.45 (see Table 1) to either 1.50 or 1.33 is calculated to cause a change in contact angle of +0.5° and -1.1°. We conclude, therefore, that the chain-length-dependence of the refractive index, if correct, does not significantly change the contact angles we calculate in this paper.
    • (1997) J. Phys. Chem. B , vol.101 , pp. 1268-1272
    • Ehler, T.T.1    Malmberg, N.2    Noe, L.J.3
  • 68
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    • Aldrich data sheet
    • Aldrich data sheet.
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    • 3
    • 3
  • 71
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    • Saunders College Publishing: San Francisco, CA
    • The model we used to estimate the thickness of SAMs formed on silver and copper was based on a tilt of the alkyl chains of 12° (measured from the surface normal) and a twist of 45°. The bond lengths were assumed to be C-H 1.10 Å, C-C 1.54 Å, C-S 1.81 Å (see Kotz, J. C.; Purcell; K. F. Chemistry and Chemical Reactivity; Saunders College Publishing: San Francisco, CA, 1987). The distance between the sulfur and the silver or copper was assumed to be 1.50 Å. The equation for the thickness d of the SAM was derived to be d = 1.23m + 3.72 Å.
    • (1987) Chemistry and Chemical Reactivity
    • Kotz, J.C.1    Purcell, K.F.2
  • 75
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    • The small contact angles measured on mixed SAMs formed from two alkanethiols with different lengths have been interpreted in terms of dispersion interactions between the alkyl chains of the SAMs and the fluids in contact with the SAMs. (See: Laibinis, P. E.; Nuzzo, R. G.; Whitesides, G. M. J. Phys. Chem. 1992, 96, 5097-5105.)
    • (1992) J. Phys. Chem. , vol.96 , pp. 5097-5105
    • Laibinis, P.E.1    Nuzzo, R.G.2    Whitesides, G.M.3
  • 83
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    • The anchoring energy is the change in surface energy upon reorientation of a liquid crystal on a surface
    • The anchoring energy is the change in surface energy upon reorientation of a liquid crystal on a surface.
  • 88
    • 5244231834 scopus 로고    scopus 로고
    • Measurements are in progress to determine the anchoring energy of liquid crystals in contact with SAMs formed from alkanethiols on gold
    • Measurements are in progress to determine the anchoring energy of liquid crystals in contact with SAMs formed from alkanethiols on gold.


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