Using Localized Surface Plasmon Resonances to Probe the Nanoscopic Origins of Adsorbate-Driven Ordering Transitions of Liquid Crystals in Contact with Chemically Functionalized Gold Nanodots

Koenig, Gary M.; Gettelfinger, Brian T.; Pablo, Juan J. de; Abbott, Nicholas L.

doi:10.1021/nl801180c

Cited by 34 publications

(41 citation statements)

References 42 publications

(96 reference statements)

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“…A second study has used surfaces decorated with gold nanoparticles that were functionalized with Cu 2+ ions 76. As described in Figure 4, this system is an interesting one because coordination interactions between the Cu 2+ and 5CB leads to local homeotropic ordering of the LC.…”

Section: Section 3: Colloidal Interactions Mediated By Lcsmentioning

confidence: 99%

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Recent Advances in Colloidal and Interfacial Phenomena Involving Liquid Crystals

2010

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This article describes recent advances in several areas of research involving the interfacial ordering of liquid crystals (LCs). The first advance revolves around the ordering of LCs at bio/ chemically functionalized surfaces. Whereas the majority of past studies of surface-induced ordering of LCs have involved surfaces of solids that present a limited diversity of chemical functional groups (surfaces at which van der Waals forces dominate surface-induced ordering), recent studies have moved to investigate the ordering of LCs on chemically complex surfaces. For example, surfaces decorated with biomolecules (e.g. oligopeptides and proteins) and transition metal ions have been investigated, leading to an understanding of the roles that metal-ligand coordination interactions, electrical double-layers, acid-base interactions, and hydrogen bonding can have on the interfacial ordering of LCs. The opportunity to create chemically-responsive LCs capable of undergoing ordering transitions in the presence of targeted molecular events (e.g., ligand exchange around a metal center) has emerged from these fundamental studies. A second advance has focused on investigations of the ordering of LCs at interfaces with immiscible isotropic fluids, particularly water. In contrast to prior studies of surface-induced ordering of LCs on solid surfaces, LC-aqueous interfaces are deformable and molecules at these interfaces exhibit high levels of mobility and thus can reorganize in response to changes in interfacial environment. A range of fundamental investigations involving these LC-aqueous interfaces have revealed that (i) the spatial and temporal characteristics of assemblies formed from biomolecular interactions can be reported by surface-driven ordering transitions in the LCs, (ii) the interfacial phase behaviour of molecules and colloids can be coupled to (and manipulated via) the ordering (and nematic elasticity) of LCs, and (iii) confinement of LCs leads to unanticipated size-dependent ordering (particularly in the context of LC emulsion droplets). The third and final advance addressed in this article involves interactions between colloids mediated by LCs. Recent experiments involving microparticles deposited at the LC-aqueous interface have revealed that LC-mediated interactions can drive interfacial assemblies of particles through reversible ordering transitions (e.g., from one-dimensional chains to two-dimensional arrays with local hexagonal symmetry). In addition, recent single nanoparticle measurements suggest that the ordering of LCs about nanoparticles differs substantially from micrometer-sized particles and that the interactions between nanoparticles mediated by the LCs are far weaker than predicted by theory (sufficiently weak that the interactions are reversible and thus enable self-assembly). Finally, LC-mediated interactions between colloidal particles have also been shown to lead to the formation of colloidin-LC gels that possess mechanical properties relevant to the design of materials to interface with li...

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Section: Section 3: Colloidal Interactions Mediated By Lcsmentioning

confidence: 99%

“…These results suggest that cooperative ordering transitions involving nematic LCs can be used to amplify the changes in refractive index about nanoparticles and increase LPSR responses to binding events. 76…”

Section: Section 3: Colloidal Interactions Mediated By Lcsmentioning

confidence: 99%

Recent Advances in Colloidal and Interfacial Phenomena Involving Liquid Crystals

2010

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“…Such systems have a potential for the development of new composite materials that can be used as chemical and biological sensors and novel types of electro-optic devices. In fact studies on plasmonic metal NPs dispersed in LCs have shown that the optical properties are quite sensitive to the presence of NPs [1,2]. Another type of LC-NP composite that has been extensively studied makes use of NPs of the ferroelectric materials BaTiO 3 and Sn 2 P 2 S 6 [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Nanoparticle induced director distortion and disorder in liquid crystal-nanoparticle dispersions

Gupta

Satpathy

Roy

et al. 2010

Journal of Colloid and Interface Science

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“…Various liquid crystal display (LCD) modes, such as vertical alignment (VA) [1][2][3][4][5][6][7][8][9][10][11][12], in-plane switching (IPS) [13], and fringe-field switching (FFS) [14][15][16][17], have been developed to improve the image quality of LCDs. The VA mode exhibits a high contrast ratio for normal viewing and can be fabricated simply without need for rubbing.…”

Section: Introductionmentioning

confidence: 99%

“…The VA mode exhibits a high contrast ratio for normal viewing and can be fabricated simply without need for rubbing. Although the viewing angle properties of the VA mode are inferior to the other modes, this has been overcome using multi-domain technology with protrusion (MVA) [1][2][3], patterned electrodes (PVA) [4][5][6], 4 Authors to whom any correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Reduced operating voltage and grey-to-grey response time in a vertically aligned liquid crystal display using a mixture of two polyimide alignment materials

Lee¹,

Choi²,

Lee³

et al. 2013

J. Phys. D: Appl. Phys.

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We proposed a method to reduce the operating voltage and the grey-to-grey switching time of a vertically aligned liquid crystal display using a mixture of planar and vertical polyimide alignment materials. The surface anchoring energy of the two-polyimide mixture was smaller than that of the pure vertical polyimide and consequently, liquid crystal molecules were easily switched to a planar state with an electric field, resulting in a greater maximum retardation than that of the pure polyimide at the same applied voltage. Rising time was also significantly reduced due to the suppressed optical bouncing effect in the mixed planar polyimide, and the decaying time showed negligible change. With the proposed approach, we can reduce the cell gap to obtain half-wave retardation allowing for faster response time while keeping a low operating voltage.

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Using Localized Surface Plasmon Resonances to Probe the Nanoscopic Origins of Adsorbate-Driven Ordering Transitions of Liquid Crystals in Contact with Chemically Functionalized Gold Nanodots

Cited by 34 publications

References 42 publications

Recent Advances in Colloidal and Interfacial Phenomena Involving Liquid Crystals

Recent Advances in Colloidal and Interfacial Phenomena Involving Liquid Crystals

Nanoparticle induced director distortion and disorder in liquid crystal-nanoparticle dispersions

Reduced operating voltage and grey-to-grey response time in a vertically aligned liquid crystal display using a mixture of two polyimide alignment materials

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