2006
DOI: 10.2478/s11772-006-0040-y
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Tunable topographical cellulose matrices for electro-optical liquid crystal cells

Abstract: 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… Show more

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Cited by 8 publications
(2 citation statements)
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“…2L) into Equation 2, we obtain an estimate of the surface anchoring coefficient W=4.9×10 -5 J/m 2 . This estimate is consistent with the weak surface anchoring boundary conditions assumed in the model, as well as is close to the independent measurements of polar surface anchoring coefficient at the cellulose-5CB interfaces reported in literature (30,31).…”
Section: Sub-millisecond Electric Switchingsupporting
confidence: 92%
“…2L) into Equation 2, we obtain an estimate of the surface anchoring coefficient W=4.9×10 -5 J/m 2 . This estimate is consistent with the weak surface anchoring boundary conditions assumed in the model, as well as is close to the independent measurements of polar surface anchoring coefficient at the cellulose-5CB interfaces reported in literature (30,31).…”
Section: Sub-millisecond Electric Switchingsupporting
confidence: 92%
“…In the mid‐1990s Godinho et al obtained much better transmission values at more moderate voltages using a new cellulose‐derived LC composite. In contrast to the early PDLC systems in which the LC constituent was dispersed inside the polymeric matrix, the electro‐optical cell using a cellulose derivative and liquid crystals, named as cellulose polymer dispersed liquid crystal (CPDLC), was produced by sandwiching a cellulose‐derived solid thin film between two nematic‐liquid‐crystal layers, and the stack was assembled between two rigid or flexible conductive transparent substrates . These devices showed very interesting features, including elevated transmission coefficients values (≈0.8), although they required turn‐on fields of ≈1.5 V µm −1 for cell gaps between electrodes of the order of 50 µm…”
Section: Cellulose‐based Materials That Mimic “Smart” Natural Systemsmentioning
confidence: 99%