Ions and size effects in nanoparticle/liquid crystal colloids sandwiched between two substrates. The case of two types of fully ionized species

2020

Nanomaterials

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Nanomaterials in liquid crystals are a hot topic of contemporary liquid crystal research. An understanding of the possible effects of nanodopants on the properties of liquid crystals is critical for the development of novel mesogenic materials with improved functionalities. This paper focuses on the electrical behavior of contaminated nanoparticles in liquid crystals. More specifically, an analogy between electrolytes and ion-generating nanomaterials in liquid crystals is established. The physical consequences of this analogy are analyzed. Under comparable conditions, the number of ions generated by nanomaterials in liquid crystals can be substantially greater than the number of ions generated by electrolytes of similar concentration.

Section: Discussionmentioning

confidence: 59%

On the Analogy between Electrolytes and Ion-Generating Nanomaterials in Liquid Crystals

2020

Nanomaterials

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“…The applicability and limitations of (1) to compute the concentration of mobile ions in liquid crystals doped with nanoparticles were recently discussed in papers [63][64][65]. It should be stressed that (1) is an approximation which is reasonably applicable to describe ions in molecular liquid crystals.…”

Section: Elementary Modelmentioning

confidence: 99%

“…According to Figure 4 (inset), at the same concentration of nanoparticles, the ion releasing effect is greater if smaller nanoparticles are used. Additional details can also be found in recently published papers [63,65].…”

Section: Case Study: Cdse/zns Core/shell Nanoparticles In Liquid Crysmentioning

confidence: 99%

Nanoparticle-Enabled Ion Trapping and Ion Generation in Liquid Crystals

Advances in Condensed Matter Physics

2018

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Nowadays, nanomaterials in liquid crystals and their possible applications in the design of tunable, responsive, and wearable devices are among the most promising research directions. In the majority of cases, all liquid crystal based devices have one thing in common; namely, they are driven by electric fields. This type of device driving can be altered by minor amounts of ions typically present in liquid crystal materials. Therefore, it is very important to understand how nanodopants can affect ions in liquid crystals. In this paper, a recently developed model of contaminated nanoparticles is applied to existing experimental data. The presented analysis unambiguously indicates that, in general, nanomaterials in liquid crystals can behave as a source of ions or as ion traps. Physical factors determining the type of the nanoparticle behaviour and their effects on the concentration of ions in liquid crystals are discussed.

“…It should be stressed that Equation (1) is an approximation which can be applied to liquid crystals doped with nanoparticles with certain restrictions discussed in recent papers [64,67,72]. In a general case, a more rigorous approach based on Boltzmann-Poisson equation should be considered [73][74][75][76].…”

Section: Modelmentioning

confidence: 99%

“…Equations (1) and (2) can also be generalized to account for several types of dominant ions in liquid crystals [63,64]. In the simplest case of two dominant types of fully ionized ionic species characterized by their volume concentrations, n 1 = n 1 + = n 1 − and n 2 = n 2 + = n 2 − , the system of Equations (3) and (4) can be used (j = 1, 2; the meaning of physical quantities entering these equations are similar to that of Equations (1) and (2) [61,63,64]):…”

Section: Modelmentioning

confidence: 99%

Ion-Generating and Ion-Capturing Nanomaterials in Liquid Crystals

The 1st International Electronic Conference on Crystals

2018

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Abstract:The majority of tunable liquid crystal devices are driven by electric fields. The performance of such devices can be altered by the presence of small amounts of ions in liquid crystals. Therefore, the understanding of possible sources of ions in liquid crystal materials is very critical to a broad range of existing and future applications employing liquid crystals. Recently, nanomaterials in liquid crystals have emerged as a hot research topic, promising for its implementation in the design of wearable and tunable liquid crystal devices. An analysis of published results revealed that nanodopants in liquid crystals can act as either ion-capturing agents or ion-generating objects. In this paper, a recently developed model of contaminated nanomaterials in liquid crystals is analyzed. Nanoparticle-enabled ion capturing and ion generation regimes in liquid crystals are discussed within the framework of the proposed model. This model is in very good agreement with existing experimental results. Practical implications and future research directions are also discussed.