Effect of the surfactant alkyl chain length on the stabilisation of lyotropic nematic phases

Akpınar, Erol; Canioz, Cihan; Turkmen, Meric; Reis, Dennys; Neto, A. M. Figueiredo

doi:10.1080/02678292.2017.1309698

Cited by 17 publications

(12 citation statements)

References 36 publications

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“…This result is really very interesting, because other experimental and theoretical studies showed that the uniaxial to biaxial transitions have to be of second-order. In addition, early [40] and recent [13,15] studies, especially obtained from the temperature dependence of the birefringence, showed that these phase transitions are of second-order, as predicted by mean-field theory [16,18].…”

Section: Introductionmentioning

confidence: 83%

“…In the phase diagrams of lyotropic mixtures presenting the three nematic phases, the N B phase is mainly located between the other two uniaxial phases [1,2,[7][8][9][10][11][12][13][14][15]. The transition from the uniaxial (N D or N C ) to the biaxial phase is of second order, as predicted by the Landau-type mean-field theory [16,17].…”

Section: Introductionmentioning

confidence: 94%

“…In a more recent study [15], we have also investigated the relation between the alkyl-chain length of the surfactant and the alcohol in a different experimental design. In this case, we examined the effect of the surfactant alkyl-chain length on the stability of the different nematic phases, at constant alcohol chain-length and mixture composition.…”

Section: Effects Of Alkyl-chain Lengths Of Surfactant and Cosurfactantmentioning

confidence: 99%

“…Remembering that KL is kosmotropic and SDS is chaotropic type surfactants, the head groups of the surfactants KL and SDS interact with strongly kosmotropic Na + and chaotropic K + ions, respectively, to produce strongly bound ion-pairs at the micelle surfaces, which leads to the formation of larger micelles. X-ray diffraction studies indicated that the larger the micelles the higher the birefringences [15]. Consequently, it would be better to conclude that the larger value of the birefringences is attributed to the formation of tightly bound ion-pairs at the micelle surfaces.…”

Section: Effect Of Interactions Between Head Groups and Ions Of Electmentioning

confidence: 99%

“…Considering the relative alkyl chain length of both surfactant (m) and alcohol (n), the higher (smaller) the value of the m (n), when compared with the value of n (m), the larger the phase domains of the N D and N B (N C ) [11,15]. Indeed, this situation is a result of the molecular segregation of the surfactant and alcohol molecules in the micelles.…”

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confidence: 99%

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Experimental Conditions for the Stabilization of the Lyotropic Biaxial Nematic Mesophase

Akpınar

Neto

2019

Crystals

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Nematic phases are some of the most common phases among the lyotropic liquid crystalline structures. They have been widely investigated during last decades. In early studies, two uniaxial nematic phases (discotic, ND, and calamitic, NC) were identified. After the discovery of the third one, named biaxial nematic phase (NB) in 1980, however, some controversies in the stability of biaxial nematic phases began and still continue in the literature. From the theoretical point of view, the existence of a biaxial nematic phase is well established. This review aims to bring information about the historical development of those phases considering the early studies and then summarize the recent studies on how to stabilize different nematic phases from the experimental conditions, especially, choosing the suitable constituents of lyotropic mixtures.

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Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 94%

Section: Effects Of Alkyl-chain Lengths Of Surfactant and Cosurfactantmentioning

confidence: 99%

Section: Effect Of Interactions Between Head Groups and Ions Of Electmentioning

confidence: 99%

mentioning

confidence: 99%

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Experimental Conditions for the Stabilization of the Lyotropic Biaxial Nematic Mesophase

Akpınar

Neto

2019

Crystals

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Micellar Lyotropic Nematic Gels

et al. 2021

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Lyotropic liquid crystal (LLC) gels are a new class of liquid crystal (LC) networks that combine the anisotropy of micellar LLCs with the mechanical stability of a gel. However, so far, only micellar LLC gels with lamellar and hexagonal structures have been obtained by the addition of gelators to LLCs. Here, the first examples of lyotropic nematic gels are presented. The key to obtain these nematic gels is the use of gelators that have a non‐amphiphilic molecular structure and thus leave the size and shape of the micellar aggregates essentially unchanged. By adding these gelators to lyotropic nematic phases, an easy and reproducible way to obtain large amounts of lyotropic nematic gels is established. These nematic gels preserve the long‐range orientational order and optical birefringence of a lyotropic nematic phase but have the mechanical stability of a gel. LLC nematic gels are promising new materials for elastic and anisotropic hydrogels to be applied as water‐based stimuli‐responsive actuators and sensors.

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Comparison between lyotropic cholesteric phase behavior with partly fluorinated surfactants and their exact hydrogenated counterparts

Akpınar

Yurdakul

Neto

2018

Journal of Molecular Liquids

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Effect of the surfactant alkyl chain length on the stabilisation of lyotropic nematic phases

Cited by 17 publications

References 36 publications

Experimental Conditions for the Stabilization of the Lyotropic Biaxial Nematic Mesophase

Experimental Conditions for the Stabilization of the Lyotropic Biaxial Nematic Mesophase

Micellar Lyotropic Nematic Gels

Comparison between lyotropic cholesteric phase behavior with partly fluorinated surfactants and their exact hydrogenated counterparts

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