Computational Modeling of Light‐triggered Topography Changes of Azobenzene‐modified Liquid Crystal Polymer Coatings

Liu, Ling; Onck, Patrick

doi:10.1002/9783527690534.ch4

Cited by 1 publication

(2 citation statements)

References 96 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2(c), we select a light intensity of a = 5 and b = 0.5 and a thickness of w = 2d t . As shown in our previous work, the characteristic in-plane dimension relative to the film thickness is crucial for the surface topography of LC films with non-uniform director distributions 25,40 and determines the mechanical interactions between the neighbouring regions with different director alignments. We start the analysis by taking the length of the unit cell l (see Fig.…”

Section: Thin Films At Low Light Intensitymentioning

confidence: 64%

See 1 more Smart Citation

Travelling waves on photo-switchable patterned liquid crystal polymer films directed by rotating polarized light

2019

Self Cite

View full text Add to dashboard Cite

Nature employs travelling waves to generate propulsion of fluids, cells and organisms. This has inspired the development of responsive material systems based on different external triggers. Especially lightactuation is suitable because of its remote control and scalability, but often complex, moving light sources are required. Here, we developed a method that only requires flood exposure by rotating the linear polarization of light to generate propagating surface waves on azobenzene-modified liquid crystalline polymer films. We built a photomechanical computational model that accounts for the attenuation of polarized light and trans-to-cis isomerization of azobenzene. A non-uniform in-plane distribution of the liquid crystal molecules allows for the generation of travelling surface waves whose amplitude, speed and direction can be controlled through the intensity, rotation direction and rotation speed of the linear polarization of a light source. Our method opens new avenues for motion control based on light-responsive topographical transformations for application in microfluidic lab-on-chip systems and soft robotics.

show abstract

Section: Thin Films At Low Light Intensitymentioning

confidence: 64%

“….N and z 0 = w. Upon actuation, the points undergo the displacements (u x (i, j),u y (i, j),u z (i, j)). The first roughness parameter used here is the modulation depth, 30,40 defined as the vertical distance between the highest and lowest points along the surface profile,…”

Section: Roughness Parametersmentioning

confidence: 99%