Noncontact Liquid‐Crystal Alignment by Supramolecular Amplification of Nanogrooves

Hoogboom, Johan; Behdani, Mohammad; Elemans, Johannes A. A. W.; Devillers, M.A.C.; Gelder, René de; Rowan, Alan E.; Rasing, T.H.M.; Nolte, Roeland J. M.

doi:10.1002/ange.200250394

Cited by 15 publications

(20 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Other techniques that have shown the promise of replacing rubbing include the adsorption of thiols on gold,7–11 the bombardment of a carbonaceous surface with a low‐energy ion beam,12, 13 nano‐rubbing, in which an AFM or STM tip is used to induce surface anisotropy14–19 and the use of Langmuir–Blodgett monolayers 20–24. More comprehensive reviews of these methods were recently published 6, 25…”

Section: Alternativesmentioning

confidence: 99%

Supramolecular command surfaces for liquid crystal alignment

Hoogboom¹,

Elemans²,

Rasing³

et al. 2007

Polymer International

Self Cite

View full text Add to dashboard Cite

Devices based on liquid crystal display technology, ranging from watches to flat panel displays, have proliferated over the past few decades and can now be found in all conceivable aspects of everyday life. It is surprising that a crucial part in the construction of such displays, namely the alignment layer, which dictates the surface alignment of mesogenic molecules, relies essentially on a mechanical rubbing process which was invented 100 years ago. In this paper, recent developments in the construction of alignment layers (also called command layers) based on the self‐assembly of molecular and macromolecular components are discussed. Two topics are highlighted: (i) tuneable layers formed by hierarchical assembly of siloxane oligomers and phthalocyanine dyes on indium‐tin‐oxide surfaces and (ii) command layers formed by self‐assembly of porphyrin trimers. Copyright © 2007 Society of Chemical Industry

show abstract

Section: Alternativesmentioning

confidence: 99%

Supramolecular command surfaces for liquid crystal alignment

Hoogboom¹,

Elemans²,

Rasing³

et al. 2007

Polymer International

Self Cite

View full text Add to dashboard Cite

show abstract

“…It is known that organic and inorganic anisotropic architectures formed on substrate surfaces such as anisotropic grooves and porous structures affect liquidcrystal alignment. [24][25][26][27][28][29][30][31] In the present system, the surface morphologies of the grooves formed by the polymerized fibers should control the liquid-crystal alignment. Similar parallel anchoring of liquid-crystalline molecules along the fibers was observed for nematic composites containing self-assembled fibers.…”

Section: Switching Of Liquid-crystal Alignmentmentioning

confidence: 99%

Liquid-Crystal Composites Composed of Photopolymerized Self-Assembled Fibers and Aligned Smectic Molecules

Mizoshita

Kato

2006

Adv. Funct. Mater.

View full text Add to dashboard Cite

“…The alignment of polyaromatic or copolymeric thin films has been achieved by utilizing magnetic fields [13], electric fields [14,15], Langmuir-Blodgett technique [16], zone-casting technique [17], and the phenomenon of dewetting [18][19][20][21]. Wellcontrolled dewetting such as dip-coating [18] can be used to align molecules of interest, simply by the rupture of solutions on a solid surface [22]. However, in most cases, the dewetting of a solution causes multi-rings with random sizes or amorphism [23].…”

Section: Introductionmentioning

confidence: 99%

Shear-Induced Uniaxial Assembly of Polyaromatic Monolayers

Lee

Jason

Huang

et al. 2009

e-J. Surf. Sci. Nanotechnol.

View full text Add to dashboard Cite

The control of spatial arrangements of molecular building blocks on surface opens the foundational step of the bottom-up approach toward future nanotechnologies. Contemporarily, the domain size of monolayers exhibiting crystallinity falls in the submicron scale. Developed herein is a method that allows the alignment of polyaromatics with one-single domain for as long as ∼7 mm. Even more exciting is the fact that the method is applicable to every laboratory with negligible cost. The monolayers are prepared simply by placing a piece of folded lens paper against the substrate and the deposition solution containing the compound of interest. The essence of the film preparation is similar to the Couette flow where the laminar flow takes place between two concentric walls, one of which rotates and creates viscous drag proven useful to align macromolecules. The method can induce an edge-on orientation for 3,6,11,14-tetradodecyloxydibenzo[g, p]chrysene (DBC-OC12), hexakis-(4-dodecyl)-peri-hexabenzocoronene (HBC-C12) and 3,6,12,15-tetrakis-(dodecyl)-tetra-benz[a, c, h, j]anthracene (TBA-C12), which would otherwise adopt the face-on arrangement on graphite.

show abstract

Noncontact Liquid‐Crystal Alignment by Supramolecular Amplification of Nanogrooves

Cited by 15 publications

References 24 publications

Supramolecular command surfaces for liquid crystal alignment

Supramolecular command surfaces for liquid crystal alignment

Liquid-Crystal Composites Composed of Photopolymerized Self-Assembled Fibers and Aligned Smectic Molecules

Shear-Induced Uniaxial Assembly of Polyaromatic Monolayers

Contact Info

Product

Resources

About