Induced smectic phase in binary mixtures of twist-bend nematogens

• Anamarija Knežević,
• Irena Dokli,
• Marin Sapunar,
• Suzana Šegota,
• Ute Baumeister and
• Andreja Lesac

Beilstein J. Nanotechnol. 2018, 9, 1297–1307, doi:10.3762/bjnano.9.122

• duplex helical tiled chain (DHTC) model proposed by Clark’s group [24], periodicity observed by AFM may be interpreted as biaxiality pitch caused by variations of the steric shape along the duplex chain. Upon increasing the concentration of BB, the phase sequence changed. The mixtures containing 55–80

Formation and development of nanometer-sized cybotactic clusters in bent-core nematic liquid crystalline compounds

• Yuri P. Panarin,
• Sithara P. Sreenilayam,
• Jagdish K. Vij,
• Anne Lehmann and
• Carsten Tschierske

Beilstein J. Nanotechnol. 2018, 9, 1288–1296, doi:10.3762/bjnano.9.121

• function of temperature and the bias field. Keywords: bent-core liquid crystals; biaxiality; clusters; dielectric spectroscopy; Introduction Biaxial liquid crystals (LCs) exhibit supramolecular structures with long-range orientational ordering of the long and the short molecular axes but without a long

• material. Nevertheless the biaxiality was observed in systems other than the board-like molecules, such as a lyotropic LC [5] and LC polymers [6][7]. At least two low molar mass, thermotropic systems were initially found to have a biaxial nematic phase; these were tetrapodes [8][9] and bent-core (BC) LC

• systems with nematic phase [10][11][12][13][14]. Spontaneous biaxiality in the BC systems was confirmed in smectic LCs: orthogonal smectic-A (SmA)-like [15][16][17][18] and the tilted smectic-C (SmC)-like [19][20][21] phases, while the existence of a biaxial nematic phase with large enough macroscopic

Nematic topological defects positionally controlled by geometry and external fields

• Pavlo Kurioz,
• Marko Kralj,
• Bryce S. Murray,
• Charles Rosenblatt and
• Samo Kralj

Beilstein J. Nanotechnol. 2018, 9, 109–118, doi:10.3762/bjnano.9.13

• parameterize the nematic order parameter as where {q1,q2,q3} are the variational parameters. A convenient metric for the degree of biaxiality is the biaxiality parameter [14][15]: A uniaxial state and configurations with maximum biaxiality are denominated by β2 = 0 and β2 = 1, respectively. Free energy and

• . In Figure 3 the equilibrium biaxiality profiles are plotted, in which cores of TDs are clearly visible. The imposed total charges always decompose into TDs bearing elementary charges m0 = 1/2. The fingerprint of the cores of m0 = 1/2 TDs is a volcano-like rim where β2 = 1 [15][18]. For m = 1, m = 2

• ” half-hedgehog structure. The core structure is relatively complex [19] and is schematically shown in Figure 7. Its core is characterized by a negatively uniaxial finger, surrounded by a shell exhibiting maximal biaxiality, β2 = 1. The fingertip is melted due to the topology of the surroundings. To

Hole-mask colloidal nanolithography combined with tilted-angle-rotation evaporation: A versatile method for fabrication of low-cost and large-area complex plasmonic nanostructures and metamaterials

• Jun Zhao,
• Bettina Frank,
• Frank Neubrech,
• Chunjie Zhang,
• Paul V. Braun and
• Harald Giessen

Beilstein J. Nanotechnol. 2014, 5, 577–586, doi:10.3762/bjnano.5.68

• biaxiality of our sample. Therefore, contributions of polarization conversion to the measured ΔTRCP-LCP spectra are expected. According to this, we use the calculation introduced in references [1][17] to obtain the real chiral response: We measure the transmittance difference ΔTRCP-LCP of our sample with