Use of Stimuli Responsive Polymers Grafted on Mixed Self-Assembled Monolayers To Tune Transitions in Surface Energy

Langmuir ◽  
2003 ◽  
Vol 19 (19) ◽  
pp. 8115-8116 ◽  
Author(s):  
Sergio Mendez ◽  
Linnea K. Ista ◽  
Gabriel P. López
Keyword(s):  
Surface Energy ◽  
Self Assembled Monolayers ◽  
Stimuli Responsive ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Assembled Monolayers ◽  
Self Assembled

Photoisomerization of azobenzene-substituted alkanethiolates on Au(111) substrates in the context of work function variation: the effect of structure and packing density

2019 ◽  
Vol 21 (18) ◽  
pp. 9098-9105 ◽  
Author(s):  
Swen Schuster ◽  
Matthias Füser ◽  
Andika Asyuda ◽  
Piotr Cyganik ◽  
Andreas Terfort ◽  
...  
Keyword(s):  
Work Function ◽  
Packing Density ◽  
Self Assembled Monolayers ◽  
Stimuli Responsive ◽  
Molecular Dipole ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
Effect Of Structure

Novel azobenzene-substituted self-assembled monolayers were used for stimuli-responsive work function variation, with control of the molecular dipole and sterical constraints.

Ultralow surface energy self-assembled monolayers of iodo-perfluorinated alkanes on silica driven by halogen bonding

Nanoscale ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 2401-2411 ◽  
Author(s):  
Keyun Shou ◽  
Jun Ki Hong ◽  
Elliot S. Wood ◽  
James M. Hook ◽  
Andrew Nelson ◽  
...  
Keyword(s):  
Surface Energy ◽  
Halogen Bonding ◽  
Self Assembled Monolayers ◽  
Silica Surfaces ◽  
Assembled Monolayers ◽  
Self Assembled

Self-assembled monolayers of iodo-perfluoro alkanes are shown to form on silica surfaces, guided by halogen bonding.

scholarly journals Dry and wet nano-scale impact dynamics of rough surfaces with or without a self-assembled monolayer

2007 ◽  
Vol 221 (2) ◽  
pp. 49-58 ◽  
Author(s):  
M Teodorescu ◽  
H Rahnejat
Keyword(s):  
Surface Energy ◽  
Power Transmission ◽  
Self Assembled Monolayers ◽  
Small Scale ◽  
Self Assembled Monolayer ◽  
Load Bearing ◽  
Transient Nature ◽  
Contact Behaviour ◽  
Assembled Monolayers ◽  
Self Assembled

In nanoscale conjunctions, molecular interactions cannot be ignored, nor surface energy effects, adhesion of surface asperities, or their stiction by any wetting action of an intervening fluidic media. Many experimental micro-electromechanical systems (MEMS) are prone to failure or malfunction due to structural degradation (wear and damage) of their load-bearing and power-transmitting conjunctions. Remedial solutions have been attempted by surface treatments, such as the introduction of self-assembled monolayers (SAMs) that adhere to the surfaces, and which are hydrophobic in nature. The physics of many of the contributing phenomena, such as adhesion, meniscus action, or electrostatics, are reasonably well understood, but their interactions under small-scale impacting condition is less investigated. The problem has a transient nature, owing to inertial dynamics, surface topography, attractive surface energy of asperities, and formation of any condensates. The interplay between these kinetics, using the established models, can be quite complex, particularly with regard to prediction of contact area and pull-off force in rebound of impacting pairs. The behaviour can vary from near classical Hertzian to that dominated by adhesion. The repercussions can be very significant in power transmission or load bearing for these small devices. This paper attempts to contribute to the growing understanding of contact behaviour in smallscale.

Fabrication of Surface Energy Gradients Using Self-Assembled Monolayer Surfaces Prepared by Photodegradation

2011 ◽  
Vol 688 ◽  
pp. 102-106 ◽  
Author(s):  
Chang Song Liu ◽  
Dong Mei Zheng ◽  
Ji Gen Zhou ◽  
Yong Wan ◽  
Zhi Wen Li
Keyword(s):  
Surface Energy ◽  
Water Droplet ◽  
Chemical Vapor ◽  
Self Assembled Monolayers ◽  
Self Assembled Monolayer ◽  
Si Substrates ◽  
Energy Gradient ◽  
Assembled Monolayers ◽  
Self Assembled ◽  
A New Technique

A new technique, direct photodegradation of self-assembled monolayers (SAM), to obtain surface energy gradients on Si substrates was demonstrated. The gradient surface, with hydrophobic to hydrophilic gradients, was prepared by two steps: Firstly, a homogeneous fluoroalkylsilane SAM film was deposited by a chemical vapor deposition on a Si substrate. Secondly, a controlled photodegradation technique was directly applied to the homogeneous FAS-SAM surface. The surface energy gradient was then obtained due to the different intensity of photoirradiation in the different positions along the photodegraded path on the SAM surfaces. The resulting surface displayed a gradient of wettability (with the contact angle of water changing from 55° to 18°) over a distance of 4.2 mm. The water droplet was driven by surface energy gradient and spontaneously moved from the hydrophobic to hydrophilic surface. During the moving process, the water droplet accelerated firstly and then decelerated. The peak velocity was about 23.3 mm/s. The velocity is dependent on the gradient of the surface energy.

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