Analysis of morphological behaviour and electro-optical properties of silica nanoparticles doped polymer dispersed liquid crystal composites

Jayoti, Divya; Malik, Praveen; Singh, Arshdeep

doi:10.1016/j.molliq.2016.11.100

Cited by 75 publications

(22 citation statements)

References 36 publications

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“…Thermogravimetric analysis (TGA) and their derivative curves for pure PVC/PANI blends, PVC/PANI/LC-E7 and their nanocomposites with CCTO nanoparticles were done to assess the thermal stability as shown in Figures 5 and 6. Generally, pure PVC/PANI decomposed into two steps; the first mass loss step for PVC (60%), is associated with the release of HCl 24,25 : -[CH 2 CHCl]-! -[CH CH]-+ HCl, with the second mass loss.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

“…22,23 However, the development of unconventional techniques for synthesis of nanocomposites combining the properties of polymer host matrix, LC elements and the unique characteristics of nanoparticles, represent a new challenge for researcher and considerable subject of investigation. 24,25 Most recent research concerns on doping nanoparticles into PDLCs to improve the electro-optical performance. PDLCs were doped with MNPs nanoparticles for good electro-optic contrast and avoiding pouring effects in the cells.…”

Section: Introductionmentioning

confidence: 99%

“…The implementation of liquid crystal “E7” as nematic droplets in PDLC is adopted for enhancing the conductivity and homogeneity of the polymer blend 22,23 . However, the development of unconventional techniques for synthesis of nanocomposites combining the properties of polymer host matrix, LC elements and the unique characteristics of nanoparticles, represent a new challenge for researcher and considerable subject of investigation 24,25 . Most recent research concerns on doping nanoparticles into PDLCs to improve the electro‐optical performance.…”

Section: Introductionmentioning

confidence: 99%

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Polymer/liquid crystal nanocomposites for energy storage applications

Labeeb

Ibrahim

Ward

et al. 2020

Polymer Engineering & Sci

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High-dielectric constant (high-K) polymer nanocomposites based on nematic liquid crystals and CaCu 3 Ti 4 O 12 (CCTO) nanoparticles have been prepared. The host matrix is polymer dispersed liquid crystals (PDLC) in which LC (E7) droplets are dispersed in different polymer blends ratios of poly vinyl chloride/poly aniline (PVC/PANI). The PDLC (PVC/PANI/E7) in the appropriated ratios; (90/10/5), (75/25/5), and (50/50/5) were composited with 10 wt % CCTO nanoparticles. The IR spectra recorded for the PDLC nanocomposites present a spectrum similar to that of pure PDLC but with a slight shift of the peak positions. The addition of PANI and CCTO to PDLC enhances the thermal stability of the nanocomposites. SEM demonstrates agglomerates of CCTO dispersed in the polymer textures. Moreover, the addition of E7 facilitates the integration of PANI in PDLC matrix. The broadband dielectric spectrum shows high-frequency relaxation in addition to low-frequency interfacial polarization (Maxwell-Wagner type polarization). Besides, ε 0 at 50 Hz is in the order of 10 5 for PDLC/CCTO (50/50/5/10) nanocomposite. In addition, the computed energy density is found to be 74.66 J/cm 3. This presumed ratio could be accentuated as a potential candidate for energy storage application with respect to the considerations of device fabrications.

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Section: Thermogravimetric Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Polymer/liquid crystal nanocomposites for energy storage applications

Labeeb

Ibrahim

Ward

et al. 2020

Polymer Engineering & Sci

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“…The PDLCs have several advantages, which include no requirement of polarizers, flexibility, high transmittance, short open time, [14,16,34,35] however, they typically suffer from high voltage, poor contrast ratio, off-axis haze, etc. Tremendous efforts were progressed previously on optimization of PDLC materials and structure of devices to fabricate low voltage PDLCs with enhanced electro-optical properties and were sufficiently impressive [20,21,[36][37][38][39][40][41]. Despite promising results, attempts at constructing low-voltage driven PDLCs have involved either cumbersome fabrication procedures or compromised on other salient features of PDLCs [36][37][38][39][40][41][42][43][44][45][46][47][48].…”

Section: Introductionmentioning

confidence: 99%

High-Performance Polymer Dispersed Liquid Crystal Enabled by Uniquely Designed Acrylate Monomer

et al. 2020

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The widespread electro–optical applications of polymer dispersed liquid crystals (PDLCs) are hampered by their high-driving voltage. Attempts to fabricate PDLC devices with low driving voltage sacrifice other desirable features of PDLCs. There is thus a clear need to develop a method to reduce the driving voltage without diminishing other revolutionary features of PDLCs. Herein, we report a low-voltage driven PDLC system achieved through an elegantly simple and uniquely designed acrylate monomer (A3DA) featuring a benzene moiety with a dodecyl terminal chain. The PDLC films were fabricated by the photopolymerization of mono- and di-functional acrylate monomers (19.2 wt%) mixed in a nematic liquid crystal E7 (80 wt%). The PDLC film with A3DA exhibited an abrupt decline of driving voltage by 75% (0.55 V/μm) with a high contrast ratio (16.82) while maintaining other electro–optical properties almost the same as the reference cell. The response time was adjusted to satisfactory by tuning the monomer concentration while maintaining the voltage significantly low (3 ms for a voltage of 0.98 V/μm). Confocal laser scanning microscopy confirmed the polyhedral foam texture morphology with an average mesh size of approximately 2.6 μm, which is less in comparison with the mesh size of reference PDLC (3.4 μm), yet the A3DA-PDLC showed low switching voltage. Thus, the promoted electro–optical properties are believed to be originated from the unique polymer networks formed by A3DA and its weak anchoring behavior on LCs. The present system with such a huge reduction in driving voltage and enhanced electro–optical performance opens up an excellent way for abundant perspective applications of PDLCs.

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“…Different properties LCs' are needed for diverse applications areas. For these reasons, the required enhanced properties of liquid crystals are obtained by synthesizing a new liquid crystals [8,9] and/or a mixture of two or more different liquid crystals [10][11][12] and/or using polymer [13][14][15], nanoparticles [16][17][18][19] and dyes [20,21] and/or using at least two of them to reveal their LC behavior [22][23][24]. Among all of them, NPs are very important to obtain liquid crystals having different physical properties.…”

Section: Introductionmentioning

confidence: 99%

Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal

2018

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Hexylcyanobiphenyl liquid crystal was doped with graphene oxide at ratios %0.25GO, %0.5GO, %1GO and %2GO, and the change in physical properties of pristine and the doped liquid crystals has been investigated. The phase transitions of prepared samples were studied by differential scanning calorimeter and polarized optical microscopy. The differential scanning calorimeter and polarized optical microscopy results are in good agreement when examining the nematic-isotropic liquid phase transition temperatures of the hexylcyanobiphenyl. The liquid crystal texture images obtained with polarized optical microscopy reveals that thermal stability of sample changed with graphene oxide concentration, i.e., increased with graphene oxide concentration. Impedance, capacitance, conductivity and real and imaginary dielectric constants of the pure and doped liquid crystals were obtained depending on frequency and voltage at the room temperature by using impedance analyzer. These electrical properties of the pure and the graphene oxide-doped samples showed an increase with increasing the graphene oxide ratio. The voltage-dependent light transmittance experiment revealed that threshold voltage of LC cells decreased for %0.25GO-and % 1GO-dispersed samples, but it was increased at %0.5GO-and %2GO-dispersed samples.

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Analysis of morphological behaviour and electro-optical properties of silica nanoparticles doped polymer dispersed liquid crystal composites

Cited by 75 publications

References 36 publications

Polymer/liquid crystal nanocomposites for energy storage applications

Polymer/liquid crystal nanocomposites for energy storage applications

High-Performance Polymer Dispersed Liquid Crystal Enabled by Uniquely Designed Acrylate Monomer

Thermal and electro-optic properties of graphene oxide-doped hexylcyanobiphenyl liquid crystal

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