Photoluminescence of CdSe/ZnS quantum dots in nematic liquid crystals in electric fields

• Margarita A. Kurochkina,
• Elena A. Konshina and
• Daria Khmelevskaia

Beilstein J. Nanotechnol. 2018, 9, 1544–1549, doi:10.3762/bjnano.9.145

• ionic impurities. Luminescence quenching of a nematic doped with CdSe/ZnS QDs is due to nonradiative transfer of energy from LC molecules to QDs [20]. The main goal of this work was to investigate the dependence of luminescence properties of CdSe/ZnS quantum dots in a LC matrix on the reorientation of

• steady-state quenching of luminescence in the passive LC matrix (Figure 2a). The addition of CdSe/ZnS QDs in the LC leads to an increase in ionic impurities and conductivity of LCs [26][27]. The reason for this is the partial destruction of the QD shell during the mixing process and the appearance of

Impact of titanium dioxide nanoparticles on purification and contamination of nematic liquid crystals

• Dmitrii Pavlovich Shcherbinin and
• Elena A. Konshina

Beilstein J. Nanotechnol. 2017, 8, 2766–2770, doi:10.3762/bjnano.8.275

• case of liquid crystals with low initial ionic contamination, the nanoparticles led to an insignificant increase of ion density from 19.8 × 1012 cm−3 to 25.7 × 1012 cm−3. Keywords: ionic impurities; liquid crystals; nanoparticles; titanium dioxide; Findings Nowadays, liquid crystals (LCs) are widely

• (Table 1). There are several types of ions in liquid crystals in our experiments such as the ions present in the initial LC, ions adsorbed on the surfaces of nanoparticles, ionic impurities introduced by aligning layers, glue, and Br− and CTA+ ions in the case of LC2. All of these types of ions may have

Electrical response of liquid crystal cells doped with multi-walled carbon nanotubes

• Amanda García-García,
• Ricardo Vergaz,
• José F. Algorri,
• Xabier Quintana and
• José M. Otón

Beilstein J. Nanotechnol. 2015, 6, 396–403, doi:10.3762/bjnano.6.39

• liquid crystal, but in tilted positions through which some electric paths between the plates can be established. The presence of ionic impurities in the MWCNTs might somehow contribute to the conductivity as well; however, the extremely low concentration of CNTs makes it rather improbable that these ions

• they are currently under study. The nanotubes contain charges and ionic impurities that could contribute to the MWCNT reorientation with applied field, but do not contribute to the eventual relaxation. A second cause that could contribute to the effect is the π–π stacking between CNTs and LC molecules

The surface properties of nanoparticles determine the agglomeration state and the size of the particles under physiological conditions

• Christoph Bantz,
• Olga Koshkina,
• Thomas Lang,
• Hans-Joachim Galla,
• C. James Kirkpatrick,
• Roland H. Stauber and
• Michael Maskos

Beilstein J. Nanotechnol. 2014, 5, 1774–1786, doi:10.3762/bjnano.5.188

• dependency of the apparent diffusion coefficients [26]. Additionally, ionic impurities and dissolved carbon dioxide cause the presence of ions in minor amounts leading to the fact that salinity is purely defined. Therefore, the addition of small amounts of salt, for example, 5 mM NaBr as chosen here, does

Effects of the preparation method on the structure and the visible-light photocatalytic activity of Ag₂CrO₄

• Difa Xu,
• Shaowen Cao,
• Jinfeng Zhang,
• Bei Cheng and
• Jiaguo Yu

Beilstein J. Nanotechnol. 2014, 5, 658–666, doi:10.3762/bjnano.5.77

• , Triton X-100 serves as a nonionic surfactant in the W/O reverse microemulsion system to avoid the introduction of ionic impurities. These results suggest that the microemulsion method is superior for preparing Ag2CrO4 nanoparticles with homogenous distribution, as compared to the precipitation and