scholarly journals Temperature-induced liquid crystal microdroplet formation in a partially miscible liquid mixture

Soft Matter ◽  
2021 ◽  
Author(s):  
Mehzabin Patel ◽  
Anand N. P. Radhakrishnan ◽  
Ludovic Bescher ◽  
Elwin Hunter-Sellars ◽  
Benjamin Schmidt-Hansberg ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Mixture ◽  
Binary Blend ◽  
Thermotropic Liquid Crystal ◽  
Size Number ◽  
Partially Miscible ◽  
Reversible Formation

We demonstrate how, for a binary blend of a thermotropic liquid crystal and methanol, cooling from a miscible to an immiscible state induces the reversible formation of microdroplets, whose size, number and mesogen orientation can be controlled by the temperature protocol.

scholarly journals Temperature-Induced Liquid Crystal Microdroplet Formation in a Partially Miscible Liquid Mixture

2019 ◽  
Author(s):  
Mehzabin Patel ◽  
Anand N. Pallipurath Radhakrishnan ◽  
Ludovic Bescher ◽  
Elwin Hunter-Sellars ◽  
Benjamin Schmidt-Hansberg ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Mixture ◽  
Liquid Mixtures ◽  
Solution Temperature ◽  
Material System ◽  
Reversible Process ◽  
Critical Solution Temperature ◽  
Binary Liquid ◽  
Partially Miscible ◽  
Extraction Processes

The controlled formation of microdroplets through temperature variation is an intriguing concept for binary liquid mixtures with a critical solution temperature. Here, we investigate this phenomenon for a blend of methanol (MeOH) and a thermotropic liquid crystal (LC) 4-Cyano-4’-pentylbiphenyl (5CB). A near-room-temperatureinduced phase separation leads to nucleation, growth and coalescence of mesogen-rich droplets. The size and number of the droplets is tunable on the microscopic scale by variation of temperature quench depth and cooling rate. Further cooling induces a phase transition to nematic droplets with radial configuration, well-defined sizes and stability over the course of an hour. This fully reversible process is an interesting material system with relevance in diagnostics, optoelectronics, materials templating and extraction processes.<br>

scholarly journals Temperature-Induced Liquid Crystal Microdroplet Formation in a Partially Miscible Liquid Mixture

2019 ◽  
Author(s):  
Mehzabin Patel ◽  
Anand N. Pallipurath Radhakrishnan ◽  
Ludovic Bescher ◽  
Elwin Hunter-Sellars ◽  
Benjamin Schmidt-Hansberg ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Mixture ◽  
Liquid Mixtures ◽  
Solution Temperature ◽  
Material System ◽  
Reversible Process ◽  
Critical Solution Temperature ◽  
Binary Liquid ◽  
Partially Miscible ◽  
Extraction Processes

The controlled formation of microdroplets through temperature variation is an intriguing concept for binary liquid mixtures with a critical solution temperature. Here, we investigate this phenomenon for a blend of methanol (MeOH) and a thermotropic liquid crystal (LC) 4-Cyano-4’-pentylbiphenyl (5CB). A near-room-temperatureinduced phase separation leads to nucleation, growth and coalescence of mesogen-rich droplets. The size and number of the droplets is tunable on the microscopic scale by variation of temperature quench depth and cooling rate. Further cooling induces a phase transition to nematic droplets with radial configuration, well-defined sizes and stability over the course of an hour. This fully reversible process is an interesting material system with relevance in diagnostics, optoelectronics, materials templating and extraction processes.<br>

Phase behaviour and applications of a binary liquid-liquid mixture of methanol and a thermotropic liquid crystal

2017 ◽  
Author(s):  
Luis A Serrano ◽  
Maximiliano J Fornerod ◽  
Ye Yang ◽  
Simon Gaisford ◽  
Francesco Stellacci ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Mixture ◽  
Phase Behaviour ◽  
Solution Temperature ◽  
Eosin Y ◽  
Phase Mixing ◽  
Binary Liquid ◽  
Thermotropic Liquid Crystal ◽  
Upper Critical Solution Temperature ◽  
Sudan Iv

Herein, we report on the phase behaviour of a binary liquid-liquid mixture composed of methanol (MeOH) and the thermotropic liquid crystal 4-Cyano-4'-pentylbiphenyl (5CB). The corresponding phase diagram combines features of a conventional liquid-liquid mixture with characteristics that are particular to the nematic liquid crystal. We observe four arrangements as a function of composition and temperature, namely monophasic isotropic, monophasic nematic, biphasic isotropic-isotropic and biphasic isotropic-nematic, with an upper critical solution temperature of 298 K. The interplay of nematogenic and non-nematogenic species offers a number of applications. Dilution of mesogens with MeOH allows to control the isotropic-to-nematic phase transition of 5CB over a range of 35 K. The tunability of phase mixing and phase composition in an accessible temperature window provides novel routes for the extraction of target compounds, here shown for Eosin Y, Doxorubicin, Crystal Violet and Sudan IV.

scholarly journals Phase behaviour and applications of a binary liquid mixture of methanol and a thermotropic liquid crystal

Soft Matter ◽  
2018 ◽  
Vol 14 (22) ◽  
pp. 4615-4620 ◽  
Author(s):  
Luis A. Serrano ◽  
Maximiliano J. Fornerod ◽  
Ye Yang ◽  
Simon Gaisford ◽  
Francesco Stellacci ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Mixture ◽  
Phase Behaviour ◽  
Binary Liquid Mixture ◽  
Binary Liquid ◽  
Thermotropic Liquid Crystal

We report on the phase behaviour of methanol (MeOH) and the thermotropic liquid crystal 4-cyano-4′-pentylbiphenyl (5CB) and study novel routes for the extraction of target compounds.

Phase behaviour and applications of a binary liquid-liquid mixture of methanol and a thermotropic liquid crystal

2017 ◽  
Author(s):  
Luis A Serrano ◽  
Maximiliano J Fornerod ◽  
Ye Yang ◽  
Simon Gaisford ◽  
Francesco Stellacci ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Mixture ◽  
Phase Behaviour ◽  
Solution Temperature ◽  
Eosin Y ◽  
Phase Mixing ◽  
Binary Liquid ◽  
Thermotropic Liquid Crystal ◽  
Upper Critical Solution Temperature ◽  
Sudan Iv

Herein, we report on the phase behaviour of a binary liquid-liquid mixture composed of methanol (MeOH) and the thermotropic liquid crystal 4-Cyano-4'-pentylbiphenyl (5CB). The corresponding phase diagram combines features of a conventional liquid-liquid mixture with characteristics that are particular to the nematic liquid crystal. We observe four arrangements as a function of composition and temperature, namely monophasic isotropic, monophasic nematic, biphasic isotropic-isotropic and biphasic isotropic-nematic, with an upper critical solution temperature of 298 K. The interplay of nematogenic and non-nematogenic species offers a number of applications. Dilution of mesogens with MeOH allows to control the isotropic-to-nematic phase transition of 5CB over a range of 35 K. The tunability of phase mixing and phase composition in an accessible temperature window provides novel routes for the extraction of target compounds, here shown for Eosin Y, Doxorubicin, Crystal Violet and Sudan IV.

Reversible microscale assembly of nanoparticles driven by the phase transition of a thermotropic liquid crystal

2017 ◽  
Author(s):  
Niamh Mac Fhionnlaoich ◽  
Stephen Schrettl ◽  
Nicholas B. Tito ◽  
Ye Yang ◽  
Malavika Nair ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Self Assembly ◽  
Nematic Phase ◽  
Hierarchical Control ◽  
Building Blocks ◽  
Model System ◽  
Microscopic Level ◽  
Reversible Process ◽  
Thermotropic Liquid Crystal

The arrangement of nanoscale building blocks into patterns with microscale periodicity is challenging to achieve via self-assembly processes. Here, we report on the phase transition-driven collective assembly of gold nanoparticles in a thermotropic liquid crystal. A temperature-induced transition from the isotropic to the nematic phase leads to the assembly of individual nanometre-sized particles into arrays of micrometre-sized aggregates, whose size and characteristic spacing can be tuned by varying the cooling rate. This fully reversible process offers hierarchical control over structural order on the molecular, nanoscopic, and microscopic level and is an interesting model system for the programmable patterning of nanocomposites with access to micrometre-sized periodicities.

Inhomogeneous relaxation dynamics and phase behaviour of a liquid crystal confined in a nanoporous solid

Soft Matter ◽  
2015 ◽  
Vol 11 (16) ◽  
pp. 3176-3187 ◽  
Author(s):  
Sylwia Całus ◽  
Andriy V. Kityk ◽  
Manfred Eich ◽  
Patrick Huber
Keyword(s):  
Liquid Crystal ◽  
Dielectric Spectroscopy ◽  
Phase Behaviour ◽  
Relaxation Dynamics ◽  
Thermotropic Liquid Crystal ◽  
Structure And Dynamics

Dielectric spectroscopy reveals a radial partitioning in the structure and dynamics of a thermotropic liquid crystal confined in silica nanochannels.

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