Adsorption and self-assembly of porphyrins on ultrathin CoO films on Ir(100)

• Feifei Xiang,
• Tobias Schmitt,
• Marco Raschmann and
• M. Alexander Schneider

Beilstein J. Nanotechnol. 2020, 11, 1516–1524, doi:10.3762/bjnano.11.134

• islands on the 2BL film. The findings demonstrate the guiding effect of the cobalt oxide films of different thickness and the effect of functional surface anchoring. Keywords: adsorption energy; molecular rotors; porphyrins; self-assembly; transition metal oxides; Introduction Due to their variability

Precise local control of liquid crystal pretilt on polymer layers by focused ion beam nanopatterning

• Maxim V. Gorkunov,
• Irina V. Kasyanova,
• Vladimir V. Artemov,
• Alena V. Mamonova and
• Serguei P. Palto

Beilstein J. Nanotechnol. 2019, 10, 1691–1697, doi:10.3762/bjnano.10.164

• beam nanopatterning; nematic liquid crystal; optical retardation; pretilt control; surface anchoring; Introduction Liquid crystal (LC) interactions with adjacent interfaces play a key role in LC-based optical devices as they are responsible for stabilizing mono-domain LC configurations and ensuring

• diffraction gratings [23][24][25][26], lenses [27][28], q-plates [29], and holographic images [30] all require alternating surface anchoring conditions to stabilize complex director patterns in the LC bulk. Presently, those are realized by photoalignment [8] of organic layers that, upon irradiation with

Magnetic segregation effect in liquid crystals doped with carbon nanotubes

• Danil A. Petrov,
• Pavel K. Skokov,
• Alexander N. Zakhlevnykh and
• Dmitriy V. Makarov

Beilstein J. Nanotechnol. 2019, 10, 1464–1474, doi:10.3762/bjnano.10.145

• CNTs, μ0 is the magnetic permeability of the vacuum, Wp is the surface anchoring energy density of the NLC matrix and CNTs, v and d are the volume and transverse diameter of the CNTs, f(r) is the local volume fraction of CNTs in the suspension, kB is the Boltzmann constant, T is the temperature. The

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

• the Cartesian (x,y,z) or cylindrical geometry (r,φ,z), as illustrated in Figure 1. Accordingly, we use two different boundary conditions, to which we refer as “boundary anchoring condition” (BAC) [18] and “surface anchoring condition” (SAC), respectively. We use BAC in the “Cartesian” cells. We assume

Controlled graphene oxide assembly on silver nanocube monolayers for SERS detection: dependence on nanocube packing procedure

• Martina Banchelli,
• Bruno Tiribilli,
• Roberto Pini,
• Luigi Dei,
• Paolo Matteini and
• Gabriella Caminati

Beilstein J. Nanotechnol. 2016, 7, 9–21, doi:10.3762/bjnano.7.2

• with procedure B. The larger amount of GO obtained with procedure B (see Table 2) is therefore strictly related to the smaller fraction of bare silicon oxide surface exposed. In both cases GO adsorbs through interactions with the silver surface anchoring exclusively to the outer face of the nanocube

In situ metalation of free base phthalocyanine covalently bonded to silicon surfaces

• Fabio Lupo,
• Cristina Tudisco,
• Federico Bertani,
• Enrico Dalcanale and
• Guglielmo G. Condorelli

Beilstein J. Nanotechnol. 2014, 5, 2222–2229, doi:10.3762/bjnano.5.231

• flat Si(100) and porous Si was performed through thermally activated hydrosilylation and the functionalized samples (Si-1-Pc and PSi-1-Pc, respectively) were characterized through XPS. In addition, further experiments were performed to demonstrate that the surface anchoring is not due to physisorption

• Pc anchoring route can be evaluated from the N 1s signal, which is very low for Si-2-Pc and PSi-2-Pc samples while it is about 5 and 8 times higher for 1-Pc treated surfaces. These data point to a surface-anchoring process determined by the hydrosilylation reaction of the double bonds while