scholarly journals STUDY ON MICRO FRICTION AND ADHESION FORCE OF OTS SELF-ASSEMBLED FILM(Ⅱ)EXPERIMENT AND ANALYSIS OF ADHESION FORCE

2000 ◽  
Vol 49 (11) ◽  
pp. 2247
Author(s):  
QIAN LIN-MAO ◽  
LUO JIAN-BIN ◽  
WEN SHI-ZHU ◽  
XIAO XU-DONG
Keyword(s):  
Adhesion Force ◽  
Self Assembled

scholarly journals STUDY ON MICRO FRICTION AND ADHESION FORCE OF OTS SELF-ASSEMBLED FILM(Ⅰ)EXPERIMENT AND ANALYSIS OF FRICTION

2000 ◽  
Vol 49 (11) ◽  
pp. 2240
Author(s):  
QIAN LIN-MAO ◽  
LUO JIAN-BIN ◽  
WEN SHI-ZHU ◽  
XIAO XU-DONG
Keyword(s):  
Adhesion Force ◽  
Self Assembled

Wetting of a self-assembled 1,4-benzenedimethanethiol monolayer on gold and silver: An adhesion force spectroscopy study

2006 ◽  
Vol 600 (14) ◽  
pp. 2894-2899 ◽  
Author(s):  
Nele Vandamme ◽  
Koen Schouteden ◽  
Johan Snauwaert ◽  
Peter Lievens ◽  
Chris Van Haesendonck
Keyword(s):  
Adhesion Force ◽  
Force Spectroscopy ◽  
Spectroscopy Study ◽  
Self Assembled

MOLECULAR RECOGNITION OF NUCLEOBASES ATTACHED TO SELF-ASSEMBLED MONOLAYERS DETECTED BY CHEMICAL FORCE MICROSCOPY AND QUARTZ CRYSTAL MICROBALANCE

2002 ◽  
Vol 01 (05n06) ◽  
pp. 667-671 ◽  
Author(s):  
HIROSHI SUNAMI ◽  
KUNIHARU IJIRO ◽  
MASATSUGU SHIMOMURA
Keyword(s):  
Quartz Crystal Microbalance ◽  
Quartz Crystal ◽  
Adhesion Force ◽  
Self Assembled Monolayers ◽  
Adhesion Forces ◽  
Force Microscopy ◽  
Chemical Force Microscopy ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Chemical Force

In order to develop a new DNA sequencing method by using chemical force microscopy (CFM), we have investigated the interaction of the hydrogen bonding between surfaces of nucleobase self-assembled monolayers (SAMs) and AFM-tips modified with the nucleobases. The two different adhesion forces, the jump-in force and pull-off force, between the AFM-tip modified with cytosine-SAM and the surfaces of four kinds of nucleobase SAMs were measured in water (20°C) by CFM. The adsorption of poly (C) onto a nucleobase-SAM on a gold electrode of quartz crystal microbalance (QCM) was measured as resonance frequency changes. The relative relation among four bases showed similar tendency in the adhesion force measured by the cytosine AFM-tip and in the adsorption amount of poly (C) on the QCM electrode as well as in the theoretically calculated interaction energies between two nucleobases.

The effects of humidity and surface free energy on adhesion force between atomic force microscopy tip and a silane self-assembled monolayer film

2010 ◽  
Vol 25 (3) ◽  
pp. 556-562 ◽  
Author(s):  
Chien-Chao Huang ◽  
Lijiang Chen ◽  
Xiaohong Gu ◽  
Minhua Zhao ◽  
Tinh Nguyen ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Free Energy ◽  
Surface Free Energy ◽  
Adhesion Force ◽  
Capillary Condensation ◽  
Self Assembled Monolayer ◽  
Force Microscopy ◽  
Atomic Force ◽  
Rate Of Increase ◽  
Self Assembled

The relationship between atomic force microscopy probe-sample adhesion force and relative humidity (RH) at five different levels of surface free energy (γs) of an organic self-assembled monolayer (SAM) has been investigated. Different γs levels were achieved by exposing a patterned SiO2/CH3-terminated octyldimethylchlorosilane SAM sample to an ultraviolet (UV)/ozone atmosphere. A model consisting of the Laplace-Kelvin theory for capillary condensation for nanosized probe and probe-sample molecular interaction was derived to describe the adhesion force as a function of RH from 25 to 90% for different SAM γs values. The equations were solved analytically by using an equivalent curvature of the probe tip shape. Experimental results show that the adhesion force increases slightly with RH for nonpolar SAM. However, for polar SAM surfaces, it increases at first, reaches a maximum, and then decreases. Both the rate of increase and the maximum of the adhesion force with humidity are γs-dependent, which is in good agreement with theoretical prediction. The large rise in the adhesion force in this RH range is due to the capillary force.

scholarly journals Preparation and Investigation of the Microtribological Properties of Graphene Oxide and Graphene Films via Electrostatic Layer-by-Layer Self-Assembly

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Yongshou Hu ◽  
Haibing Ma ◽  
Wei Liu ◽  
Qianqian Lin ◽  
Bin Liu
Keyword(s):  
Graphene Oxide ◽  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Adhesion Force ◽  
Strong Dependence ◽  
Layer By Layer ◽  
Crystal Silicon ◽  
X Ray ◽  
Graphene Films ◽  
Self Assembled

Graphene oxide (GO) films with controlled layers, deposited on single-crystal silicon substrates, were prepared by electrostatic self-assembly of negatively charged GO sheets. Afterward, graphene films were prepared by liquid-phase reduction of as-prepared GO films using hydrazine hydrate. The microstructures and microtribological properties of the samples were studied using X-ray photoelectron spectroscopy, Raman spectroscopy, X-ray diffraction, UV-visabsorption spectroscopy, water contact angle measurement, and atomic force microscopy. It is found that, whether GO films or graphene films, the adhesion force and the coefficients of friction both show strong dependence on the number of self-assembled layers, which both allow a downward trend as the number of self-assembled layers increases due to the interlayer sliding and the puckering effect when the tip slipped across the top surface of the films. Moreover, in comparison with the GO films with the same self-assembled layers, the graphene films possess lower adhesion force and coefficient of friction attributed to the difference of surface functional groups.

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