Effect of the structure of gelators on electro-optical properties of liquid crystal physical gels

He, Jie; Yan, Bin; Yu, Binyu; Bao, Rui‐Ying; Wang, Xiaoan; Wang, Yinghan

doi:10.1016/j.jcis.2007.08.035

Cited by 18 publications

(17 citation statements)

References 17 publications

(30 reference statements)

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“…From discussed above, LC gels with different content of same gelators had different morphologies, and this phenomenon also had been presented in other's work . We further studied the morphologies of POSS‐G1‐BOC/5CB with other amounts of gelators (0.3 wt%/0.5 wt%/0.7 wt%/0.9 wt%/1.1 wt%/3 wt%/5 wt% POSS‐G1‐BOC/5CB) ( Figure , Table S2 and Note S4, Supporting Information) and they may clearly illustrate the complex process of self‐assembly, which would be helpful to understand the “spiral dissipate energy” model.…”

Section: Resultssupporting

confidence: 65%

“…It may because the stretching process facilitated the fusion of fibers in 3 wt%POSS‐G1‐BOC/5CB or further self‐assembly causing by the increase of aspect ratio of film and the decrease of fibers' space, similar to the rising levels of gelators (Figure S18c,d, Supporting Information). And the content of 0.5 wt% gelators was too small to fuse together because of the low network density, although the density had enhanced with the raising of L / D ratio (Figure S18a,b, Supporting Information) . The changing tensile model vividly explained the relationship between concentration and stretch.…”

Section: Resultsmentioning

confidence: 94%

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Electroresponsive Stretchable Liquid‐Crystal Device with Deformable Gel Network

Tong

Shan

et al. 2019

Adv Elect Materials

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meet the requirement of bend or fold in most situations. But some devices like biomimetic epidermal electronics or implantable electronic devices need to adapt the large complex deformation of skins or biological tissues, which cause the idea that stretch ability is regarded as a key factor of designing devices. [10] And in the area of liquid display, traditional liquid crystal (LC) materials have been used in our life for so long time, but they could not be universally used in the deformable devices owing to their natural properties of flow and orderliness, and they are far more likely to flow to everywhere with no fixed shape and show cluttered arrangement mode influenced by external force, much less the application in stretchable devices.To overcome this weakness of LC mole cules, gelators are added to firm the LC molecules' shapes through 3D gel net work, finally developing a new special kind of soft materials which exhibit both LC materials' advantages and gels' unique natures including flowability, mechanical behavior, heat stability, and so on. Considering LC materials have diverse stim uliresponsive properties [11][12][13] and many device applications such as LC gratings, [14] polymerstabilized blue phase (PSBP) I film, [15] or multiresponsive composite films, [16] the combina tion of LC materials and gels will help create more possibili ties to prepare multifunctional materials and devices. Previous study results [17] have shown that LC gel would produce vast transmittance differences through the transformation between light scattering and light transmission by LC molecules' stim uliresponsive properties such as photoresponse, electrore sponse, temperature response, and magnetic response. [14,[18][19][20][21][22] And this method could greatly simplify the LC devices' struc ture by abandoning the use of Polaroid. For example, Jang and coworkers [23] reported a light scattering display using dendritic physical gel. Kato and coworkers [24][25][26] had prepared various rigid light scattering cells. Levy and coworkers [27] made a huge and rigid electrooptical window based on liquidcrystal disper sions in sol-gel matrices. Xie and coworkers [28] prepared LC gels through the selfassembly of sorbitol derivatives as gela tors in 5CB, showing its potential application in selfsupporting lightscattering electrooptical displays. Zhao and coworkers [29,30] reported a fluorescent LC gels and shown a high contrast of photoluminescence. In general, these light scattering LC devices all present rigid condition and have the features of A stretchable, flexible electroresponsive liquid-crystal (LC) device with extremely simple structure is reported. It exhibits excellent light-transmission control even during successive 45% stretching, which is due to the combination of a super-strong LC gel network (5CB/POSS-G1-BOC) and transparent conductive electrodes composed of silver nanowires (AgNWs) embedded in polyurethane (PU). The uniaxial tensile deformation mechanism of the gel network is also explained by the uniform distributi...

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Section: Resultssupporting

confidence: 65%

Section: Resultsmentioning

confidence: 94%

Electroresponsive Stretchable Liquid‐Crystal Device with Deformable Gel Network

Tong

Shan

et al. 2019

Adv Elect Materials

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“…[9][10] Phase-separated structuresa re formed in LC physical gels by the combination of two components, whichc an further affect the photoelectric performance due to the change of interface action on the boundary regions. [11][12][13] Hence the regulation of various morphologies of LC gel is crucial.…”

Section: Introductionmentioning

confidence: 99%

“…Liquid crystal (LC) physical gels are a new class of dynamically functional materials consisting of LCs and fibrous aggregates of molecules that are called “gelators”, which exhibit induced or enhanced electro‐optical, photochemical, and electronic properties . Phase‐separated structures are formed in LC physical gels by the combination of two components, which can further affect the photoelectric performance due to the change of interface action on the boundary regions . Hence the regulation of various morphologies of LC gel is crucial.…”

Section: Introductionmentioning

confidence: 99%

The Special “Morse Code” between Solvent Polarity and Morphology Flexibility in a POSS–Dendrimer Supramolecular System

Shan

Liang

Tong

et al. 2019

Chemistry A European J

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An amazing phenomenon of the relative magnitude of modulus of two liquid-crystal( LC) gels is found inverted under/abovet heir phase transition temperature T LC-iso , which is further provedt ob ecaused by their diversem orphologyf lexibility.B yt esting the polarity of two LCs, gelator POSS-G1-Boc (POSS = polyhedral oligomeric silsesquioxane) was discovered to self-assemble into more flexible structures in ar elatively low polar LC, whereasm ore rigid ones are formed in higherp olar LC. Hence, af itting functiont oc onnect morphology flexibility with solvent polarityw as established,w hich can even be generalized to an umber of common solvents. Experimental observations and coarsegrained molecular dynamics simulations revealed that solvent polarity mirrors a" Morsec ode", with each "code" corresponding to aspecificm orphologyf lexibility.

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“…In this paper, we synthesized a series of gelators (Gm, m is the length of alkyl tails, m ¼ 2, 4, 6, 8, 10, 12, 14, 16 and 18) based on 4,4 0 -diaminodiphenyl-methane with amide moieties, which could gel organic solvents with low concentration (typically <2 wt%) through hydrogen-bonding and p-p stacking interactions. 63 The chemical structures of Gm are shown in Chart 1. Paraffin was used as the latent heat material due to its high heat of fusion, proper range of phase change temperatures, chemical resistance, commercial availability, and low cost.…”

Section: Introductionmentioning

confidence: 99%