Cross-linked hydroxypropylcellulose films: mechanical behaviour and electro-optical properties of PDLC type cells

Almeida, Pedro L.; Tavares, Sheron Stephany; Martins, A. F.; Godinho, M. H.; Cidade, M. T.; Figueirinhas, J. L.

doi:10.1016/s0925-3467(02)00051-4

Cited by 22 publications

(9 citation statements)

References 7 publications

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“…The influence of different matrix parameters upon the electro-optical behaviour of the cells was studied [18,19]. In order to optimize and understand the electro-optical characteristics presented by these kinds of cells, the study of the anchoring properties of the LC on the solid cellulosic films was also performed [20].…”

Section: Introductionmentioning

confidence: 99%

Tunable topographical cellulose matrices for electro-optical liquid crystal cells

Costa¹,

Almeida²,

Filip³

et al. 2006

Opto-Electronics Review

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In this work we have used acetoxypropylcellulose (APC) to produce free standing solid films (∼60 μm) that were used for assembling electro-optical devices. Thin films were obtained from concentrated lyotropic solutions of cellulose derivatives. Induced by the cast and shearing preparation conditions wrinkles and band textures can be observed in their free-surface plane. In order to eliminate and control these textures we used a process similar to that introducted in literature [1] which consists of storing the films in the same solvent-vapour atmosphere as the solution system. Lyotropic APC liquid crystalline solutions in dymethylacetamide (DMA) with crosslinker were prepared, thin films were obtained by using a shear/casting technique and stored in the solvent-vapour atmosphere until a planar structure was achieved. The dried crosslinked films were analyzed by optical polarised microscopy (POM) and scanning electron microscopy (SEM). The films with different topographies were used to produce optical cells composed by the cellulose derivative film covered on both free surfaces by a layer of the nematic liquid crystal E7 and placed between two transparent conducting substrates. The electro-optical properties of these cells were obtained.

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Section: Introductionmentioning

confidence: 99%

Tunable topographical cellulose matrices for electro-optical liquid crystal cells

Costa¹,

Almeida²,

Filip³

et al. 2006

Opto-Electronics Review

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“…The basic optical cell is formed by the cellulose derivative film surrounded by two nematic liquid crystal layers and the set placed between two transparent conducting rigid or flexible substrates. These cells show electro-optical properties similar to those reported for polymer dispersed liquid crystals (PDLCs) [17] but the arrangement of the polymer matrix and the liquid crystal component in a diverse fashion enables the modification of the polymer surface in order to optimize the optical properties of the cell [18].…”

Section: Introductionmentioning

confidence: 75%

Strain-induced matrix and droplets anisotropic deformation in liquid crystalline cellulose dispersed liquid crystal films

Filip¹,

Costa²,

Figueirinhas³

et al. 2006

Composite Interfaces

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“…Table I presents a comparison between the EO characteristics of our earlier device and the FD, produced with two different cellulose derivatives. 9 In the HPC device, there is a considerable increase in Tr M , with only a slight increase in Tr m . Although the E on field was increased possibly because of stronger surface interaction between the fibers and the NLC, the turn-on voltage was reduced to half of its former value mainly because the FD's thickness is much smaller.…”

mentioning

confidence: 95%

Electro-optical light scattering shutter using electrospun cellulose-based nano- and microfibers

Almeida

Kundu²,

Borges

et al. 2009

Applied Physics Letters

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Electrospun cellulose-based nano and microfibers and a nematic liquid crystal are used to assemble an electro-optical (EO) light-scattering device that shows enhanced characteristics when compared to similar devices. Based on the controlled scattering of light in the composite system, the device can achieve light transmission coefficients tunable from 1% up to around 89%. Simulation of the EO behavior indicates that the roughness of the polymer-liquid crystal interface is crucial for the optical performance of the device.

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Cross-linked hydroxypropylcellulose films: mechanical behaviour and electro-optical properties of PDLC type cells

Cited by 22 publications

References 7 publications

Tunable topographical cellulose matrices for electro-optical liquid crystal cells

Tunable topographical cellulose matrices for electro-optical liquid crystal cells

Strain-induced matrix and droplets anisotropic deformation in liquid crystalline cellulose dispersed liquid crystal films

Electro-optical light scattering shutter using electrospun cellulose-based nano- and microfibers

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