Functional Discotic Liquid Crystals

Kumar, Sandeep

doi:10.1002/ijch.201200035

Cited by 37 publications

(13 citation statements)

References 80 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Discotic columnar liquid crystals (DCLC) are organic materials able to self-arrange into mesogenic columnar orders in a dened temperature range. [1][2][3][4] This ability is due to the usually planar disc-like geometry of the molecule, ensured by a rigid polyaromatic core surrounded by so functional branches (usually simple alkyl tails). [5][6][7][8][9][10] These discotic molecules tend to form an isotropic liquid phase at high temperature, and stack on top of each other in columns at lower temperatures.…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics of pyrene based discotic liquid crystals confined in nanopores probed by incoherent quasielastic neutron scattering

et al. 2014

View full text Add to dashboard Cite

International audienceSemiconducting nanowires made of discotic columnar liquid crystals can be obtained by impregnation into solid nanoporous templates, and provide new opportunities to tailor devices for organic electronics with promising charge carriers transport properties. These properties are tightly related to the self-assembly and molecular dynamics of the discotic columns inside the nanowires. We recently studied and rationalized the formation of different nanostructures in the columnar phase of pyrene derivative discotics nanoconfined in anodic alumina and porous silicon templates ([Cerclier et al., J. Phys. Chem. C, 2012, 116, 18990–18998, Kityk et al., Soft Matter, 2014, 10, 4522–4534]). We now present the molecular dynamics of nano-confined pyrene derivative mesogenic phases as studied by incoherent quasielastic neutron scattering over a broad range of correlation times. The combination of backscattering and time-of-flight techniques has allowed to describe the nature of the molecular motions at play on the pico to nanosecond time scale. The dynamics of the columnar phase is dominated by fluctuations of the lateral chains, while the onset of larger amplitude motions like whole-body reorientations and slow center-of-mass translational diffusion occurs at high temperature in the isotropic phase. Interestingly, nano-confinement does not qualitatively alter the nature of the molecular dynamics, but essentially blocks the long range translational motions and induces broader distributions of correlation times of the fastest local relaxations

show abstract

Section: Introductionmentioning

confidence: 99%

Molecular dynamics of pyrene based discotic liquid crystals confined in nanopores probed by incoherent quasielastic neutron scattering

et al. 2014

View full text Add to dashboard Cite

show abstract

“…Owing to the technological applications and fundamental importance of DLCs, they have received much attention of the scientists around the globe thtat has been reviewed in several articles. 33,34,[36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] Figure 2 Schematic representations of nematic-, smectic-and columnar-phase formation by calamitic and discotic mesogens. …”

Section: Discotic Lcsmentioning

confidence: 99%

Liquid crystals in photovoltaics: a new generation of organic photovoltaics

Kumar

2016

Polym J

Self Cite

148

View full text Add to dashboard Cite

This article presents an overview of the developments in the field of organic photovoltaics (PVs) with liquid crystals (LCs). A brief introduction to the PV and LC fields is given first, followed by application of various LCs in organic PVs. Details of LCs used in bilayer solar cells, bulk heterojunction solar cells and dye-sensitized solar cells have been given. All the liquid crystalline materials used in PVs are structured and the efficiency of solar cells is tabulated. Finally, an outlook into the future of this newly emerging, fascinating and exciting field of self-organizing supramolecular LC PV research is provided. Polymer Journal (2017) 49, 85-111; doi:10.1038/pj.2016.109; published online 9 November 2016 INTRODUCTIONFor the sustainable growth of the global economy, availability of cheap energy is essential. Our energy demand is increasing continuously to improve our lifestyle. At present, fossil energy sources are the primary sources for most of the world's current energy requirements and only a little is provided by hydropower, nuclear energy and biomass. The exponential growth of carbon dioxide level in the atmosphere owing to the burning of fossil fuels is leading to the threat of a universal climate change. Moreover, there will be limited availability of conventional energy sources in the long term. Future energy demand cannot be met with conventional sources of energy. Nuclear energy sources are one of the promising energy sources, but owing to their associated hazardousness and cost effectiveness, these energy sources does not appear to be socially acceptable universally. Moreover, nuclear fuel is also limited to tackle gigantic demand of energy. Despite several efforts, the problem of energy provision around the world remains unsolved, and there is a great need of finding alternative clean energy sources. To solve the energy crisis of the globe, exploitation of solar energy is undoubtedly the best answer. It is the most abundant inexhaustible source of regenerative energy. It is known since the evolution of life on the Earth that Mother Nature generates chemical energy from solar energy via photosynthesis. The supply of energy by Sun on Earth in an hour is more than that we use in a year. Therefore, only a fraction of solar energy is required to overcome our all energy requirements, if it can be converted to electric energy efficiently. The device that is developed to convert solar energy into electrical energy is known as photovoltaic (PV) solar cell.During the past 60 years, PV energy has been used as a promising candidate for energy devices because it is abundant, inexhaustible, cheap, straight to production ability and pollution-free that does not raise the green-house gases. The PV effect involves the generation of a photocurrent and photovoltage on absorption of light photons in a semiconductor. The three-step process, which is an

show abstract

“…We have recently disclosed that the conducting properties of DLCs can be improved by the dispersion of various nanoparticles in DLC matrix. Due to technological applications and fundamental importance of these nanocomposites, the topic has received great deal of attention from scientists around the world that has been covered in many recent articles, e.g., [ 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. In this article, we briefly present recent advances in the dispersion of small concentration of various nanomaterials in to columnar phases of DLCs.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Discotic Liquid Crystal-Assisted Nanoparticles

Gowda

Kumar

2018

Materials

Self Cite

View full text Add to dashboard Cite

This article primarily summarizes recent advancement in the field of discotic liquid crystal (DLC) nanocomposites. Discotic liquid crystals are nanostructured materials, usually 2 to 6 nm size and have been recognized as organic semiconducting materials. Recently, it has been observed that the dispersion of small concentration of various functionalized zero-, one- and two-dimensional nanomaterials in the supramolecular order of mesophases of DLCs imparts negligible impact on liquid crystalline properties but enhances their thermal, supramolecular and electronic properties. Synthesis, characterization and dispersion of various nanoparticles in different discotics are presented.

show abstract

Functional Discotic Liquid Crystals

Cited by 37 publications

References 80 publications

Molecular dynamics of pyrene based discotic liquid crystals confined in nanopores probed by incoherent quasielastic neutron scattering

Molecular dynamics of pyrene based discotic liquid crystals confined in nanopores probed by incoherent quasielastic neutron scattering

Liquid crystals in photovoltaics: a new generation of organic photovoltaics

Recent Advances in Discotic Liquid Crystal-Assisted Nanoparticles

Contact Info

Product

Resources

About