The Critical Surface Tension of Glass

Olsen, Douglas A.; Osteraas, A. Jean

doi:10.1021/j100791a510

Cited by 49 publications

(12 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The magnitude of W reflects the propensity of the two materials to form an adhesive contact. Assuming that the fused silica probe and flat Teflon AF surfaces are smooth and considering the surface energies of fused silica and Teflon AF as 75 and 15.7 mJ m −2 ,13, 21 respectively, the theoretical pull‐off force for the flat surface would be ∼0.8 mN, which is much higher than that measured experimentally (0.23 ± 0.17 mN). The deviations of the measured pull‐off forces from the theoretical values calculated by JKR theory suggest that the short‐range universal van der Waals attractions in our system are limited.…”

Section: Resultsmentioning

confidence: 77%

Teflon hierarchical nanopillars with dry and wet adhesive properties

Izadi

Zhao

Han

et al. 2012

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

The superior material properties of b-keratin along with the hierarchical high-aspect-ratio structure of geckos' foot pad have enabled geckos to stick readily and rapidly to almost any surfaces in both dry and wet conditions. In this research, nonsticky fluoropolymer (Teflon AF) resembling b-keratin rigidity and having an extremely low surface energy and dielectric constant was applied to fabricate a novel dry adhesive consisting of high-aspect-ratio nanopillars terminated with a ''fluffy'' top layer. Both the nanopillars and the terminating layer are fabricated concurrently by replica molding using a nanoporous anodic aluminum oxide membrane as the mold. These Teflon AF hierarchical nanostructures are shown to have an exceptional capacity to generate strong adhesion in both dry conditions and under water because of combined actions of van der Waals forces, electrostatic attractions, and hydrophobic effects.

show abstract

Section: Resultsmentioning

confidence: 77%

Teflon hierarchical nanopillars with dry and wet adhesive properties

Izadi

Zhao

Han

et al. 2012

J Polym Sci B Polym Phys

View full text Add to dashboard Cite

show abstract

“…The adhesion force generated by van der Waals forces can also be predicted by the Johnson-Kendall-Roberts (JKR) model which considers only the presence of short-range van der Waals interactions within the area of contact. 47 According to this theory, the pull-off force (F) detected upon detaching two surfaces is independent of the applied preload and can be calculated by F ¼ À0.75pd 0 Dg, 47 where Dg z g 1 + g 2 À (g 1 Â g 2 ) 1/2 while g 1 and g 2 are the surface energies of fused silica (75 mJ m À2 ) 48 and Teon AF (15.7 mJ m À2 ), 26 respectively. Hence, according to the JKR model, for a hemispherical fused silica probe (8 mm in diameter) in contact with Teon AF, the pull-off force of 1.06 mN is attainable, which is fairly close to that predicted by calculating the Hamaker constant (i.e., 1.14 mN).…”

Section: Adhesion and Friction Of Double-level Nanopillarsmentioning

confidence: 99%

Enhanced adhesion and friction by electrostatic interactions of double-level Teflon nanopillars

2013

View full text Add to dashboard Cite

“…This result is stabilized by FTIR-spectroscopic measurements using the ATR-technique because such interactions could not be proved by this method [14]. According to other papers [15,16] a water film is adsorbed on the quartz surface which cannot be displaced by fatty acids. Just on quartz supports a perfect transfer of both types of monolayers can be achieved without difficulties (transfer ratio 1).…”

Section: Discussionmentioning

confidence: 93%

Evidence of lateral surface structure changes in transferred multilayer systems by electron microscopy

Vollhardt¹,

Richter‐Mendau²,

Wittig³

1984

Colloid & Polymer Sci

View full text Add to dashboard Cite

Abstract:The substance-specific stability properties of transferred multilayer systems on germanium and quartz supports have been examined in the electron microscope. Typical micrographs with magnifications between 8 000 x and 40 000 x show that the surface structure of cadmium octadecanoate and octadecylammonium phosphate layer systems is dependent on the investigated parameters: type of substance, material of support, number of layers. Lateral structure rearrangement processes have been observed in the octadecanoate systems forming crystallites on both support materials and alllayer numbers. Similar irreversible transformations did not occur in transferred octadecylamine layer systems. The influence of the support material on the surface structure is interpreted as interaction differences between the support and the polar group of the first layer.

show abstract

The Critical Surface Tension of Glass

Cited by 49 publications

References 1 publication

Teflon hierarchical nanopillars with dry and wet adhesive properties

Teflon hierarchical nanopillars with dry and wet adhesive properties

Enhanced adhesion and friction by electrostatic interactions of double-level Teflon nanopillars

Evidence of lateral surface structure changes in transferred multilayer systems by electron microscopy

Contact Info

Product

Resources

About