Lyotropic Liquid Crystalline Self-Assembly in Dispersions of Silver Nanowires and Nanoparticles

Murali, Shanthi; Xu, Teng; Marshall, Bennett D.; Kayatin, Matthew J.; Pizarro, Khristine; Radhakrishnan, Vinod K.; Nepal, Dhriti; Davis, Virginia A.

doi:10.1021/la101305z

Cited by 42 publications

(43 citation statements)

References 56 publications

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“…The effects of spheres are particularly important given that many novel nanorod synthesis processes tend to create nanospheres as a side product. For instance, Murali et al17 recently demonstrated a novel liquid‐crystalline system of silver nanorods and silver nanoparticles with quantitative measurements for the isotropic/biphasic/liquid‐crystalline transition. The data show a ϕ n value that is substantially lower than the Onsager prediction.…”

Section: Introductionsupporting

confidence: 75%

Isotropic–nematic phase separation and demixing in mixtures of spherical nanoparticles with length‐polydisperse nanorods

Green

2012

J Polym Sci B Polym Phys

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An extension of Onsager theory is developed to simulate isotropic–nematic phase separation in a mixture of spheres with length‐polydisperse system of rods. This work is motivated by recent experimental data on nanorod liquid crystals. Prior theoretical investigations indicate that both polydispersity and the presence of spheres should increase the biphasic–nematic phase transition, that is, the nematic cloud point. Results indicate that the phase diagrams undergo drastic changes depending upon both particle geometry and rod length polydispersity. The key geometric factor is the ratio between the sphere diameter and the rod diameter. In general, length fractionation is enhanced by the addition of spheres, which may be experimentally advantageous for separating short nanorods from a polydisperse population. Simulation results also indicate that the nematic cloud and shadow curves may cross one another because of the scarcity of spheres in the shadow phase. In general, these results do indicate that the nematic cloud point increases as a function of sphere loading; however, in certain areas of phase space, this relationship is nonmonotonic such that the nematic cloud point may actually decrease with the addition of spheres. This work has application to a wide range of nanoparticle systems, including mixtures of spherical nanoparticles with nanorods or nanotubes. Additionally, a number of nonspherical particles and structures may behave as spheres, including crumpled graphene and tightly coiled polymers. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012

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Section: Introductionsupporting

confidence: 75%

Isotropic–nematic phase separation and demixing in mixtures of spherical nanoparticles with length‐polydisperse nanorods

Green

2012

J Polym Sci B Polym Phys

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“…This behavior is quite similar to that of liquid crystalline polymers, 37−39 SWNT−superacid liquid crystals, 12 and silver nanowire liquid crystals. 5 This behavior is very different from that of isotropic dispersions, 40 where oscillatory transients last a few shear units at most. The silica dispersion data also exhibited the scaling behavior previously reported for liquid crystalline polymers.…”

Section: ■ Experimental Sectionmentioning

confidence: 86%

“…4 Murali et al showed that mixtures of high aspect ratio silver nanowires and nanoparticle aggregates formed demixed nematic liquid crystalline phases in both ethylene glycol and water and highlighted the potential for making aligned films for optoelectronic devices. 5 While these and other works have increased our understanding of lyotropic nematic inorganic nanocylinder systems, there have been few reports of smectic phase behavior. The ability to produce appreciable quantities of nanocylinders with narrow size distributions is still evolving, and smectic liquid crystalline phase formation has typically been viewed as requiring a very uniform size distribution.…”

Section: ■ Introductionmentioning

confidence: 99%

Liquid Crystalline Phase Behavior of Silica Nanorods in Dimethyl Sulfoxide and Water

Davis

2014

Langmuir

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We report lyotropic smectic liquid crystalline phase behavior of silica nanorods dispersed in binary mixtures of dimethyl sulfoxide (DMSO) and water (H2O). The phase behavior is affected by nanorod size polydispersity and DMSO concentration in the binary solvent. The isotropic to biphasic transition is strongly affected by the relative amount of DMSO in the solvent, but the solvent has little effect on the biphasic to liquid crystal transition above 40/60 DMSO/H2O by volume. At less than 40% DMSO, increasing silica nanorod concentration initially results in the formation of liquid crystalline domains, but further increasing silica concentration results in crystal solvate formation. The morphology of the liquid crystalline phase is strongly affected by the size polydispersity, with lower polydispersity leading to a more uniform structure. As in other lyotropic nanocylinder systems, the microstructure of continuous solid films produced from the dispersions was affected by both the initial microstructure and the applied shear.

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“…Lyotropic nematic LC phase formation in dispersions of silver nanowires and nanoparticles in ethylene glycol and water has been reported [39]. The silver nanowires and nanoparticles are coated with polyvinylpyrrolidone and their mixtures are dispersed in ethylene glycol and water.…”

Section: Liquid Crystalline Nanorodsmentioning

confidence: 95%

Liquid Crystalline Anisotropic Nanoparticles: From Metallic and Semiconducting Nanoparticles to Carbon Nanomaterials

Bisoyi

2015

Anisotropic Nanomaterials

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Anisotropic nanomaterials made of metals, semiconductors, or carbon are of special interest for their mechanical, electrical, magnetic, optical, chemical and other spectacular properties in the bottom-up fabrication of advanced functional materials and devices in the field of nanoscience and nanotechnology. To widen their applicability, it is necessary to process these anisotropic building blocks into different well-defined assembly structures with preferred orientations. This chapter deals with the liquid crystalline properties of one-and two-dimensional (1D and 2D) anisotropic nanoparticles such as nanorods, nanotubes, nanodiscs and graphene derivatives. The different strategies developed for the realization of liquid crystal phases from metallic, semiconducting and carbon based anisotropic nanoparticles have been discussed. High performance materials and devices fabricated by processing via liquid crystalline route of these materials have also been highlighted.

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Lyotropic Liquid Crystalline Self-Assembly in Dispersions of Silver Nanowires and Nanoparticles

Cited by 42 publications

References 56 publications

Isotropic–nematic phase separation and demixing in mixtures of spherical nanoparticles with length‐polydisperse nanorods

Isotropic–nematic phase separation and demixing in mixtures of spherical nanoparticles with length‐polydisperse nanorods

Liquid Crystalline Phase Behavior of Silica Nanorods in Dimethyl Sulfoxide and Water

Liquid Crystalline Anisotropic Nanoparticles: From Metallic and Semiconducting Nanoparticles to Carbon Nanomaterials

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