The role of adhesion forces in nanoscale measurements of the conductive properties of organic surfaces using conductive probe AFM

2004 ◽  
Author(s):  
Alexei V. Tivanski ◽  
Gilbert C. Walker
Keyword(s):  
Adhesion Forces ◽  
Organic Surfaces ◽  
Nanoscale Measurements ◽  
Conductive Properties

scholarly journals Atomic force microscopy of DNA and bacteriophage in air, water and propanol: the role of adhesion forces

1993 ◽  
Vol 21 (5) ◽  
pp. 1117-1123 ◽  
Author(s):  
Y.L. Lyubchenko ◽  
P.I. Oden ◽  
D. Lampner ◽  
S.M. Lindsay ◽  
K.A. Dunker
Keyword(s):  
Atomic Force Microscopy ◽  
Adhesion Forces ◽  
Force Microscopy ◽  
Atomic Force

scholarly journals The Role of Functionalized Organic Surfaces in Metal Biomineralization: Insights from Liquid-Cell STEM Experiments

2021 ◽  
Vol 27 (S2) ◽  
pp. 81-82
Author(s):  
C. Dejean ◽  
N. Ortiz Peña ◽  
B. Menez ◽  
C. Gadal ◽  
D. Alloyeau ◽  
...  
Keyword(s):  
Liquid Cell ◽  
Organic Surfaces

Bacterial-nanostructure interactions: The role of cell elasticity and adhesion forces

2019 ◽  
Vol 546 ◽  
pp. 192-210 ◽  
Author(s):  
Aaron Elbourne ◽  
James Chapman ◽  
Amy Gelmi ◽  
Daniel Cozzolino ◽  
Russell J. Crawford ◽  
...  
Keyword(s):  
Adhesion Forces ◽  
Cell Elasticity

The Influence of Adhesion and Sub-Newton Pull-Off Forces on the Release of Objects in Outer Space

2006 ◽  
Vol 128 (4) ◽  
pp. 828-840 ◽  
Author(s):  
M. Benedetti ◽  
D. Bortoluzzi ◽  
M. Da Lio ◽  
V. Fontanari
Keyword(s):  
Outer Space ◽  
Space Mission ◽  
Theoretical Background ◽  
Contact Forces ◽  
Zero Gravity ◽  
Adhesion Forces ◽  
Fractal Surface ◽  
Element Analysis ◽  
Interaction Forces

The theoretical background and the numerical modeling results of a ground-based verification activity of a critical space mission phase affected by adhesion issues are presented. Tribological models are first reviewed with an emphasis on the contact forces assessment and their relationship to the geometrical, material, and mechanical properties of the contacting metal bodies. An approach based on a finite element analysis of the contact, accounting for the adhesion forces, is then proposed for studying the contact behavior of smooth surfaces in vacuum. Some solutions aimed at reducing adhesion pull-off forces are discussed. Special emphasis is placed on the role of surface roughness in reducing adhesion. To this purpose, a fractal surface theory is used to estimate interaction forces. The obtained results are applied to discuss the role of adhesion on the release of a test mass under zero gravity as well as to suggest an appropriate detachment procedure that finds a specific application in a scientific space mission.

scholarly journals Role of contact electrification and electrostatic interactions in gecko adhesion

2014 ◽  
Vol 11 (98) ◽  
pp. 20140371 ◽  
Author(s):  
Hadi Izadi ◽  
Katherine M. E. Stewart ◽  
Alexander Penlidis
Keyword(s):  
Electrostatic Interactions ◽  
Van Der Waals ◽  
Adhesion Forces ◽  
Intimate Contact ◽  
Contact Electrification ◽  
Dry Adhesion ◽  
Dry Adhesives ◽  
Gecko Adhesion ◽  
First Time

Geckos, which are capable of walking on walls and hanging from ceilings with the help of micro-/nano-scale hierarchical fibrils (setae) on their toe pads, have become the main prototype in the design and fabrication of fibrillar dry adhesives. As the unique fibrillar feature of the toe pads of geckos allows them to develop an intimate contact with the substrate the animal is walking on or clinging to, it is expected that the toe setae exchange significant numbers of electric charges with the contacted substrate via the contact electrification (CE) phenomenon. Even so, the possibility of the occurrence of CE and the contribution of the resulting electrostatic interactions to the dry adhesion of geckos have been overlooked for several decades. In this study, by measuring the magnitude of the electric charges, together with the adhesion forces, that gecko foot pads develop in contact with different materials, we have clarified for the first time that CE does contribute effectively to gecko adhesion. More importantly, we have demonstrated that it is the CE-driven electrostatic interactions which dictate the strength of gecko adhesion, and not the van der Waals or capillary forces which are conventionally considered as the main source of gecko adhesion.

The Role of Impregnants in Determining the Behaviour of Mechanical Carbon Sealing Rings

1983 ◽  
Vol 197 (1) ◽  
pp. 45-49
Author(s):  
M A Rabah ◽  
S M Eldighidy ◽  
A A Abdul Azim
Keyword(s):  
Epoxy Resin ◽  
Coal Tar ◽  
Coal Tar Pitch ◽  
Adhesion Forces ◽  
Crude Petroleum ◽  
Proper Selection ◽  
Petroleum Oil ◽  
Selection Of

The lifetime of mechanical carbon sealing rings fitted into crude petroleum oil pumps can be increased by a factor of 43 by multiple impregnation with coal tar pitch. For single impregnation, epoxy resin yielded the largest improvement. The results were interpreted on the premise that properties such as viscosity, adhesion forces, and coking value determine the effectiveness of the impregnant. The proper selection of the impregnant and procedure of impregnation is dependent on the pumping pressure and oil properties.

scholarly journals Elasto-capillarity in insect fibrillar adhesion

2016 ◽  
Vol 13 (121) ◽  
pp. 20160371 ◽  
Author(s):  
Sophie Gernay ◽  
Walter Federle ◽  
Pierre Lambert ◽  
Tristan Gilet
Keyword(s):  
Elastic Beam ◽  
Primary Role ◽  
Adhesion Forces ◽  
Unknown Parameters ◽  
Leaf Beetles ◽  
High Adhesion ◽  
Direct Measurements ◽  
Underlying Mechanisms ◽  
Fibrillar Adhesion

The manipulation of microscopic objects is challenging because of high adhesion forces, which render macroscopic gripping strategies unsuitable. Adhesive footpads of climbing insects could reveal principles relevant for micro-grippers, as they are able to attach and detach rapidly during locomotion. However, the underlying mechanisms are still not fully understood. In this work, we characterize the geometry and contact formation of the adhesive setae of dock beetles ( Gastrophysa viridula ) by interference reflection microscopy. We compare our experimental results to the model of an elastic beam loaded with capillary forces. Fitting the model to experimental data yielded not only estimates for seta adhesion and compliance in agreement with previous direct measurements, but also previously unknown parameters such as the volume of the fluid meniscus and the bending stiffness of the tip. In addition to confirming the primary role of surface tension for insect adhesion, our investigation reveals marked differences in geometry and compliance between the three main kinds of seta tips in leaf beetles.

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