Chirality, twist and structures of micellar lyotropic cholesteric liquid crystals in comparison to the properties of chiralic thermotropic phases

Comparison of helical twisting powers of novel fluorinated amphiphilic enantiomers with their hydrogenated counterparts

“…2b implies, then as the L α phase is reached, the fingerprint texture disappears. This means that the shortest P (the highest twist) will be observed near the I phase limit and the longest P (the smallest twist) near the L α phase limit, which may arise from shape anisotropy or form anisotropy of the micelles [7,26,27]. Our "skewed micelle" model is similar to the "intramicellar chirality" model proposed by Partyka and Hiltrop [6], which is, in our opinion, useful in explaining why, in general, alanine esters exhibit higher htps than the serine esters, Table 3a, and how intermicellar chiral information may be visualized.…”

“…3d. Similar figures were used to describe the helix formation of discotic phases in t -LCs [28] and also in l-LCs [7,8]. In order to understand these systems completely, the micelle dimensions, the order parameters of head groups and motions of the carbon chains in the intrinsic N * phases and their racemic N phases have to be known.…”

“…In general, aqueous micellar cholesteric (chiral nematic) phases can be produced either by purely resolved amphiphilic enantiomers [1][2][3] or by addition of a suitable chiral solute (dopant) to a micellar nematic (N) phase [4][5][6][7]. In both cases, the obtained spatial helical arrangement is characterized by the helical pitch (P) and its handedness.…”

The apparent solubilizing capacity of simulated intestinal fluids for poorly water-soluble drugs

“…There are two factors which make this interaction more complex: Firstly, it is known that a drug can change the structure of a micelle due to its presence by for example changing the micelle shape. [29] Secondly, a micelle provides more than one environment for a drug to be solubilized. For example, drugs can be included in the lipophilic core or alternatively in the outer more polar microdomains of the micelles.…”

Chiral tetraphenylethenes as novel dopants for calamitic and discotic liquid crystals

“…The presence of chiral molecules (dopants) in the phase results in the formation of a chiral nematic phase where the dopant induces a helical twisting of the director field. [48][49][50][51][52][53][54][55][56][57][58] This can be visualized under the polarizing optical microscope by a characteristic fingerprint texture of equidistant bright and dark stripes, which reveal different director orientations (see e.g. Fig.…”