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  • Articles  (7)
  • American Institute of Physics (AIP)  (7)
  • 1
    Electronic Resource
    Electronic Resource
    The effect of Young's modulus on the surface-force-induced contact radius of spherical glass particles on polyurethane substrates (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 71 (1992), S. 2253-2258 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The radius of contact, arising from surface force interactions, was determined using scanning electron microscopy for glass beads having nominal radii of 12 and 20 μm in contact with two polyurethane substrates, differing principally in Young's modulus (3.83 and 41.7 MPa, respectively). It was found that the ratios of the contact radii scaled according to the model proposed by Johnson, Kendall, and Roberts [Proc. R. Soc. London Ser. A 324, 301 (1971)]. The works of adhesion calculated from these results were found to be approximately 0.12 J/m2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351123
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  • 2
    Electronic Resource
    Electronic Resource
    The time dependence of the surface-force-induced contact radius between glass particles and polyurethane substrates: Effects of substrate viscoelasticity on particle adhesion (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 3360-3361 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Glass particles having mean diameters of 20 μm were deposited onto substrates consisting of cross-linked polyurethane having Young's moduli of 2.5 and 32 MPa. The surface-force-induced contact radii were then determined, as a function of time for periods between 20 and 3600 min, using scanning electron microscopy. No changes in the contact radius with time was found with either substrate. This suggests that the 0.75 power dependence of the contact radius on particle radius, for particles in contact with polyurethane substrates, previously reported [D. S. Rimai, L. P. DeMejo, and R. C. Bowen, J. Appl. Phys. 66, 3574 (1989)] was not caused by viscous response of the substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.349272
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of thin, semi-rigid coatings on the adhesion-induced deformations between rigid particles and soft substrates (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 668-672 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Glass particles, having nominal radii of approximately 20 μm, were deposited onto polyurethane substrates, which had been overcoated with a 5-μm-thick thermoplastic layer, and the surface-force-induced contact radii were measured using scanning electron microscopy. It was found that the size of the deformations depends only on the modulus of the coating and not on the modulus of the underlying substrate. The measured contact radii were found to scale with the Young's modulus of the substrate for the uncoated polyurethane substrates according to the predictions of the JKR model [K. L. Johnson, K. Kendall, and A. D. Roberts, Proc. R. Soc. London Ser. A 324, 301 (1971)]. However, the contact radii on the overcoated substrates appear to be more accurately predicted by the DMT theory [B. V. Derjaguin, V. M. Muller, and Yu P. Toporov, J. Colloid Interface Sci. 53, 314 (1975)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.353349
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  • 4
    Electronic Resource
    Electronic Resource
    Surface-force-induced deformations of monodisperse polystyrene spheres on planar silicon substrates (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 6234-6240 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The contact radii between polystyrene spheres, having diameters between approximately 1.5 and 12 μm, and polished silicon wafers, arising from adhesion forces, were determined using scanning electron microscopy. It was found that the contact radius varied approximately as the square root of the particle radius. This dependence is consistent with nonelastic response models of adhesion, such as those proposed by Krupp [H. Krupp, Adv. Colloid Interface Sci. 1, 111 (1967)] and by Maugis and Pollock [D. Maugis and H. M. Pollock, Acta Metall. 32, 1323 (1984)], but is inconsistent with various elastic response models which assume Hertzian deformations. The experimentally determined contact radii are also compared to those obtained for polystyrene spheres on a polyurethane substrate [D. S. Rimai, L. P. DeMejo, and R. C. Bowen, J. Appl. Phys. 66, 3574 (1989)].
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346888
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  • 5
    Electronic Resource
    Electronic Resource
    Observations of adhesion-induced deformations between spheroidal gold particles and conducting substrates (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 65 (1989), S. 755-759 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Spheroidal gold particles, approximately 3 μm in diameter, were deposited on both hard and soft planar, electrically conducting substrates, and the interfaces were observed using scanning electron microscopy. It was observed that the particles appeared to embed into the softer substrate, but not into the harder one. The softer substrate also appeared to flow up the sides of the particles. The diameters of the craters formed are compared with the predictions based on Hertz' [Zimon, Adhesion of Dusts and Powders (Consultants Bureau, New York, 1982)] model of elastic deformation, Krupp's [Adv. Colloid Interface Sci. 1, 111 (1967)] model of plastic response [assuming van der Waals (Zimon, ibid. and Krupp, ibid.) interactions], and Johnson, Kendall, and Roberts' [Proc. R. Soc. London Ser. A 324, 301 (1971)] model of tensile response due to surface tension. These calculations suggest that the observed deformation on the softer substrate is predominantly plastic rather than elastic and that surface tension is significant. The techniques are expanded and results reported for the case of gold particles on insulating surfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.343090
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  • 6
    Electronic Resource
    Electronic Resource
    The fabrication of thin-film thermocouples for determining the temperature and thermal conductivity within a flexible material (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1601-1605 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Thin-film thermocouples were produced on flexible polymeric and paper substrates using evaporation techniques. These devices were found to be simple to produce, durable, and to have good temperature sensitivity. These devices allow the temperature and thermal conductivity of thin coatings to be determined in a variety of processes with minimal impact to the process or loss of heat through the leads.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144032
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  • 7
    Electronic Resource
    Electronic Resource
    Adhesion-induced deformations of polymeric substrates: Particle size dependence of the contact area (1989)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 66 (1989), S. 3574-3578 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Adhesion-induced deformations of a polyurethane substrate in contact with cross-linked polystyrene spheres, having diameters ranging from less than 2 μm to approximately 12.5 μm were observed using scanning electron microscopy. The diameters of the contact areas were measured from the micrographs. It was found that the contact radius varied as the particle radius raised to the 0.75±0.05 power. Experimental results are compared to the predictions of various adhesion models. The results are also discussed in terms of the Dupré work of adhesion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.344087
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