Lateral force microscope and phase imaging of patterned thiol self-assembled monolayer using chemically modified tips

1998 ◽  
Vol 66 (7) ◽  
pp. S1275-S1277 ◽  
Author(s):  
K. Sasaki ◽  
Y. Koike ◽  
H. Azehara ◽  
H. Hokari ◽  
M. Fujihira
Keyword(s):  
Lateral Force ◽  
Phase Imaging ◽  
Self Assembled Monolayer ◽  
Chemically Modified ◽  
Self Assembled ◽  
Lateral Force Microscope

Self-assembled monolayer growth on chemically modified polymer surfaces

2006 ◽  
Vol 252 (10) ◽  
pp. 3532-3540 ◽  
Author(s):  
S. Pimanpang ◽  
Pei-I. Wang ◽  
G.-C. Wang ◽  
T.-M. Lu
Keyword(s):  
Polymer Surfaces ◽  
Self Assembled Monolayer ◽  
Chemically Modified ◽  
Modified Polymer ◽  
Monolayer Growth ◽  
Self Assembled

Atomic Force Microscopy Imaging of Glucose Oxidase using Chemically Modified Tips

2003 ◽  
Vol 56 (10) ◽  
pp. 1039 ◽  
Author(s):  
Dusan Losic ◽  
Ken Short ◽  
Joe G. Shapter ◽  
Justin J. Gooding
Keyword(s):  
Atomic Force Microscopy ◽  
Glucose Oxidase ◽  
Self Assembled Monolayer ◽  
Microscopy Imaging ◽  
Force Microscopy ◽  
Chemically Modified ◽  
Atomic Force ◽  
Hydrophilic Nature ◽  
Assembled Monolayers ◽  
Self Assembled

Atomic force microscopy (AFM) tips have been chemically modified using a variety of approaches mostly based on self-assembled monolayers (SAMs). Tips with both a hydrophobic and hydrophilic nature have been prepared and used to image glucose oxidase covalently attached to a self-assembled monolayer.

Self-Assembly of Rod-Like Particles Into 2D Lattices

2008 ◽  
Author(s):  
M. Janjua ◽  
S. Nudurupati ◽  
I. Fischer ◽  
P. Singh ◽  
N. Aubry
Keyword(s):  
Electric Field ◽  
Self Assembly ◽  
Lateral Force ◽  
Spherical Particles ◽  
Fluid Interfaces ◽  
Electric Force ◽  
Fluid Interface ◽  
Self Assembled Monolayer ◽  
Approach Velocity ◽  
Self Assembled

It was recently shown by us that spherical particles floating on a fluid-fluid interface can be self-assembled, and the lattice between them can be controlled, using an electric field. In this paper we show that the technique can also be used to self assemble rod-like particles on fluid-fluid interfaces. The method consists of sprinkling particles at a liquid interface and applying an electric field normal to the interface, thus resulting in a combination of hydrodynamic (capillary) and electrostatic forces acting on the particles. A rod floating on the fluid interface experiences both a lateral force and a torque normal to the interface due to capillarity, and in the presence of an electric field, it is also subjected to an electric force and torque. The electric force affects the rods’ approach velocity and the torque aligns the rods parallel to each other. In the absence of an electric field, two rods that are initially more than one rod length away from each other come in contact so that they are either perpendicular or parallel to the line joining their centers, depending on their initial orientations. In the latter case, their ends are touching. Our experiments show that in an electric field of sufficiently large strength, only the latter arrangement is stable. Experiments also show that in this case the electric field causes the rods of the monolayer to align parallel to one another and that the lattice spacing of a self-assembled monolayer of rods increases.

Tribological Characteristics of Materials for MEMS/NEMS by Using Chemically Modified AFM Tip

2007 ◽  
Author(s):  
J. C. Heo ◽  
K. S. Kim ◽  
K. W. Kim
Keyword(s):  
Tribological Characteristics ◽  
Adhesion Forces ◽  
Self Assembled Monolayer ◽  
Chemically Modified ◽  
Self Assembled

Friction and adhesion tests were conducted in order to investigate the tribological characteristics of materials for MEMS/NEMS using AFM. AFM Si tips were chemically modified with self-assembled monolayer (SAM) derived from trichlorosilane like OTS and FOTS, and various materials such as Si, Al, Au, Cu, Ti, PMMA and PDMS were prepared for the tests. The friction and adhesion forces between AFM Si tip modified with SAM and MEMS/NEMS materials were measured and compared to those forces when AFM tip was uncoated. According to the results, however, the effect of SAM on the reduction of friction and adhesion could be changed with counterpart materials. After coating OTS on Si tip, the friction and adhesion forces on most of materials decreased while the friction and adhesion forces on PDMS rather increased than decreased. In case of the coating of FOTS, the friction and adhesion forces on PMMA540k and PDMS increased. Therefore, the adequate application of SAM would be required to effectively reduce friction and adhesion on each material for MEMS/NEMS.

Lateral force microscopy study of functionalized self-assembled monolayer surfaces

1999 ◽  
Vol 341 (1-2) ◽  
pp. 91-93 ◽  
Author(s):  
Yun Kim ◽  
Kwang-Salk Kim ◽  
Mingyu Park ◽  
Jaein Jeong
Keyword(s):  
Lateral Force ◽  
Microscopy Study ◽  
Lateral Force Microscopy ◽  
Self Assembled Monolayer ◽  
Force Microscopy ◽  
Self Assembled

Self-Assembled Fluid Phase Floating Membranes with Tuneable Water Interlayers

2019 ◽  
Author(s):  
Luke Clifton ◽  
Nicoló Paracini ◽  
Arwel V. Hughes ◽  
Jeremy H. Lakey ◽  
Nina-Juliane Seinke ◽  
...  
Keyword(s):  
Fluid Phase ◽  
Interlayer Thickness ◽  
Supported Bilayers ◽  
Self Assembled Monolayer ◽  
High Coverage ◽  
Nano Technology ◽  
Surface Distance ◽  
Potential Applications ◽  
Self Assembled ◽  
Coated Surfaces

<p>We present a reliable method for the fabrication of fluid phase unsaturated bilayers which are readily self-assembled on charged self-assembled monolayer (SAM) surfaces producing high coverage floating supported bilayers where the membrane to surface distance could be controlled with nanometer precision. Vesicle fusion was used to deposit the bilayers onto anionic SAM coated surfaces. Upon assembly the bilayer to SAM solution interlayer thickness was 7-10 Å with evidence suggesting that this layer was present due to SAM hydration repulsion of the bilayer from the surface. This distance could be increased using low concentrations of salts which caused the interlayer thickness to enlarge to ~33 Å. Reducing the salt concentration resulted in a return to a shorter bilayer to surface distance. These accessible and controllable membrane models are well suited to a range of potential applications in biophysical studies, bio-sensors and Nano-technology.</p><br>

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