Gold nanoparticles in columnar matrix of discotic liquid crystal

Effect of dispersed colloidal gold nanoparticles on the electrical properties of a columnar discotic liquid crystal

“…7). 18 However, in present case the graph shows that there is no increment in the permittivity at the phase transition when sample is cooled from the isotropic phase in the case of pure HAT4 and composite having 1.2 wt% GNPs. In the case of composite having 1.2 wt% GNPs, a small discontinuity of the permittivity has been detected at $105 C (see curve 4 of Fig.…”

“…Some theoretical and experimental results suggest that the permittivity increases at the isotropic to columnar hexagonal phase transitions in the case of homeotropic alignment. 18 However, in present case the graph shows that there is no increment in the permittivity at the phase transition when sample is cooled from the isotropic phase in the case of pure HAT4 and composite having 1.2 wt% GNPs. To solve this curious problem especially for pure HAT4, we acquired data upto the 3rd cycle as well (to ensure best alignment of the molecules).…”

“…Typical column-column distance in the columnar hexagonal phase is around 2-4 nm depending on the aliphatic chain length and the core-core distance within the column is around 0.35 nm. 12,13 Innumerable reports exist in which NPs have been dispersed in DLCs, [14][15][16][17][18] nematic LCs [19][20][21][22] and FLCs. The quasi-onedimensional electrical conductivity in these discotic systems has been proposed for diverse applications in the areas including solar cells, molecular electronics, photovoltaic cells, and organic light emitting diodes.…”

“…Nano particles can effectively be used to tune the properties of liquid crystals. 12,13 Innumerable reports exist in which NPs have been dispersed in DLCs, [14][15][16][17][18] nematic LCs [19][20][21][22] and FLCs. 23,24 Also NPs have been dispersed in the Smectic-A phase of a de Vries liquid crystalline material.…”

Estudio de las propiedades fisicoquímicas de cristales líquidos formados por partículas discoidales mediante simulación molecular

“…86 In addition to describing intercolumnar arrangements and intra (or intra-alternating) columnar separation, it is also of interest to consider liquid-crystalline structures that result from local-scale interfacial effects, 45,47,[87][88][89] thin films, [90][91][92][93][94][95][96][97][98][99][100] substrates, [101][102][103][104][105][106] or dopants. 25,28,[107][108][109][110][111][112][113][114][115][116][117][118][119][120][121][122][123] Experiments have showcased the versatility possible with DLC mixtures. Compounds that behave with a CPI paradigm, 50,[53][54][55][56][57][58][59][60] in which disc types alternate by ''fastening'' on top of one another, can yield a columnar phase with enhanced electrical conduction and a wider temperature range of stability.…”