Search results
Search for "segregation" in Full Text gives 82 result(s) in Beilstein Journal of Nanotechnology.
Nanostructured lipid carriers containing benznidazole: physicochemical, biopharmaceutical and cellular in vitro studies
Beilstein J. Nanotechnol. 2023, 14, 804–818, doi:10.3762/bjnano.14.66
- carriers showed contributions from both the isolated myristyl myristate and additional Bragg peaks at 19.1° and 23.3° corresponding to the copolymer. This indicates that there was phase segregation, most likely a core–shell structure with the lipidic phase inside and the hydrophilic part of the copolymer
Plasmonic nanotechnology for photothermal applications – an evaluation
Beilstein J. Nanotechnol. 2023, 14, 380–419, doi:10.3762/bjnano.14.33
Recent trends in Bi-based nanomaterials: challenges, fabrication, enhancement techniques, and environmental applications
Beilstein J. Nanotechnol. 2022, 13, 1316–1336, doi:10.3762/bjnano.13.109
- energy levels may be created between CB and VB of Bi-based photocatalysts. This can increase light absorption, and charge transfer may be improved to enhance electron–hole segregation and reduce recombination. It is not uncommon to see nonmetals atoms replaced with heteroatoms, such as N (C), B (S), X (F
- to improve absorption of visible light, charge carrier segregation, and charge transport effectiveness by combining heterojunction and nanomaterials in photocatalysts constructed with care. As a result, this technique offers much potential for photocatalysis applications [94]. The band arrangement
- stability of CuS/Bi2WO6 photocatalysts may be primarily due to the presence of an electrical potential at the interface, which is responsible for both the enhanced visible light absorption and the efficient segregation of photoinduced charges. This study introduced a unique 2D interfacial coupling for the
Electrocatalytic oxygen reduction activity of AgCoCu oxides on reduced graphene oxide in alkaline media
Beilstein J. Nanotechnol. 2022, 13, 1020–1029, doi:10.3762/bjnano.13.89
- of Co atoms in the Ag lattice [28][29], while reflections of Cu mask the Ag reflections. We see a systematic variation of the particle sizes for the bi- and trimetallic NPs (Table S1, Supporting Information File 1), which could be connected to the intermixing and phase segregation of mainly Co3O4 in
Temperature and chemical effects on the interfacial energy between a Ga–In–Sn eutectic liquid alloy and nanoscopic asperities
Beilstein J. Nanotechnol. 2022, 13, 817–827, doi:10.3762/bjnano.13.72
- increase of the interfacial energy as a function of the temperature, which can be explained by the reactivity between SiOx and Ga and the occurrence of chemical segregation at the liquid alloy surface. Keywords: atomic force microscopy (AFM); interfacial energy; liquid alloy; Introduction Recently, room
- surface tension of liquid gallium. Oxygen is a surface-active substance whose effect on surface tension has been investigated for various liquid metals [10]. In metallic alloys, surface segregation has also been observed, where an element with a higher oxygen affinity enriches at the surface to form an
- depend on the chemistry of the asperities. Furthermore, we observe a weak increase of the interfacial energy as a function of the temperature. We discuss our results based on the reactivity between SiOx and Ga and the occurrence of chemical segregation at the liquid alloy surface. Experimental We
Measurement of polarization effects in dual-phase ceria-based oxygen permeation membranes using Kelvin probe force microscopy
Beilstein J. Nanotechnol. 2021, 12, 1380–1391, doi:10.3762/bjnano.12.102
- interfaces between CSO and FC2O have been shown to be mainly clean with only a slight segregation of Sm. Additionally, in some areas residues of a rock salt phase have been found. This phase is prone to develop during the synthesis process of CSO-FC2O depending on the sintering parameters. The formation can
A review of defect engineering, ion implantation, and nanofabrication using the helium ion microscope
Beilstein J. Nanotechnol. 2021, 12, 633–664, doi:10.3762/bjnano.12.52
Interface interaction of transition metal phthalocyanines with strontium titanate (100)
Beilstein J. Nanotechnol. 2021, 12, 485–496, doi:10.3762/bjnano.12.39
- treatments [12][13] or water leaching [14][15]. The SrO termination is often achieved via thermal Sr segregation [16][17][18] or by deposition of SrO in vacuo [19][20]. Due to the thermal Sr segregation effect, sputtering and annealing procedures result commonly in SrO-terminated surfaces [21]. The detailed
- preparation procedures differ distinctly. For example, the temperature range for Sr segregation reaches from 570 K [22] to 1570 K [23]. In many cases, mixed surface terminations are obtained consisting of multiple islands of dominant terminations or SrO droplets [21][22][24][25]. SrTiO3(100) bulk structures
The role of gold atom concentration in the formation of Cu–Au nanoparticles from the gas phase
Beilstein J. Nanotechnol. 2021, 12, 72–81, doi:10.3762/bjnano.12.6
- displacement of Au atoms into the surface layer. Moreover, the rate of segregation increased with temperature, which was experimentally confirmed [24]. This effect is a direct consequence of the different binding energies of gold and copper atoms (i.e., with these nanoparticle sizes, the binding energy of
The influence of an interfacial hBN layer on the fluorescence of an organic molecule
Beilstein J. Nanotechnol. 2020, 11, 1663–1684, doi:10.3762/bjnano.11.149
- ) surface, the hBN layers, and the PTCDA layers was checked by LEED. We used a SPA-LEED instrument as described in [30]. An additional annealing step between the last sputter cycle and the borazine deposition was omitted here in order to prevent segregation of chemical impurities from the Cu bulk to the
- ” supporting SERS because FLA is shifted in energy, which is less expected for coupling to metallic protrusions. An alternative origin of these defects could be the presence of carbon containing species due to segregation from the Cu bulk. Although this interpretation is speculative, we give some background in
- order to aid subsequent research. When the Cu(111) crystal was annealed at a temperature above 1050 K and for a period of time longer than 30 min, we observed an additional superstructure in LEED. Although we cannot identify these segregations unambiguously, we assume carbon segregation as carbon is
Atomic layer deposition for efficient oxygen evolution reaction at Pt/Ir catalyst layers
Beilstein J. Nanotechnol. 2020, 11, 952–959, doi:10.3762/bjnano.11.79
- this, a Pt/Ir mixture can be deposited along the TiO2 tube walls by atomic layer deposition (ALD). Energy-dispersive X-ray analysis confirms the presence of all elements expected (Figure 3d). The metallic nature of the ALD deposits, the lack of any segregation between Pt and Ir, and the metal oxide
Band tail state related photoluminescence and photoresponse of ZnMgO solid solution nanostructured films
Beilstein J. Nanotechnol. 2020, 11, 899–910, doi:10.3762/bjnano.11.75
- unavoidable in the structure transformation process, in a certain interval of Mg concentrations. The phase segregation process was investigated in detail by means of X-ray diffraction, element-specific near-edge X-ray absorption fine structure (NEXAFS), electron dispersive spectroscopy (EDS), atomic force
- microscopy (AFM), UV–vis spectroscopy, photoluminescence (PL) and resistivity measurements in Zn1−xMgxO thin films deposited by the sol–gel spin-coating route in the composition range x = 0.00–0.40 [23]. It was found that the phase segregation manifests itself starting at a Mg content of x = 0.25. However
- , the results showed that films are deposited with wurtzite structure as the dominant phase even after phase segregation in the investigated Mg concentration interval. The issue of phase segregation was also investigated via selective resonant Raman scattering in a wider composition range of x = 0.00
Epitaxial growth and superconducting properties of thin-film PdFe/VN and VN/PdFe bilayers on MgO(001) substrates
Beilstein J. Nanotechnol. 2020, 11, 807–813, doi:10.3762/bjnano.11.65
- matches that of the palladium-rich Pd1−xFex alloys (face-centered cubic with a0 = 389 pm). Therefore, a good crystallinity of the layer stack can hardly be expected. In the resulting polycrystalline films, crystallite boundaries and crystal lattice imperfections can lead to the segregation of iron
Formation of metal/semiconductor Cu–Si composite nanostructures
Beilstein J. Nanotechnol. 2019, 10, 2497–2504, doi:10.3762/bjnano.10.240
- -like structure was formed (Figure 4b). Furthermore, after the next few nanoseconds, a core–shell nanocluster was formed. It was noted that when the silicon content was low, the segregation of silicon atoms to the cluster surface occurred almost immediately after the cooling started, and, in most cases
- , the cluster did not change the core–shell structure. At the same time, for a silicon concentration of equal or more than 50 atom %, the segregation process largely depended on the cooling rate. The simulation of a nanocluster with a size of 4.6 nm containing 50 atom % silicon and copper atoms, with
Microbubbles decorated with dendronized magnetic nanoparticles for biomedical imaging: effective stabilization via fluorous interactions
Beilstein J. Nanotechnol. 2019, 10, 2103–2115, doi:10.3762/bjnano.10.205
- effective attractive interactions can operate in water and organic solvents. For example, such interactions are responsible for the partition and segregation of F-alkyl chains, on which “fluorous” technologies are based that are used in many synthesis and separation processes [40]. However, studies of such
Green and scalable synthesis of nanocrystalline kuramite
Beilstein J. Nanotechnol. 2019, 10, 2073–2083, doi:10.3762/bjnano.10.202
- not correspond to the reaction mixture. The initial assessment of the dataset variability has been carried out through the use of the biplot (Figure S1, Supporting Information File 1) methodology for compositional data analysis [51][62]. This analysis suggests a strong segregation between Sn and Cl as
- well as a partial segregation between Cu and S. Since the variability of Cu and S is much smaller than Sn and Cl, further inspection is required. For this purpose, we applied the partition criteria based on the decreasing variance. This enables the reduction of the five dimensions of the original
- associated phase. Two factors should be considered: 1) the difference between the atomic percentage of Cu and S in the CuS standard is systematically close to 3%; 2) the segregation of Cl in an associated phase exclusively with Cu. Conversely, Sn and S are present in the main phase with the highest
Fabrication and characterization of Si1−xGex nanocrystals in as-grown and annealed structures: a comparative study
Beilstein J. Nanotechnol. 2019, 10, 1873–1882, doi:10.3762/bjnano.10.182
- separation in the SiGe nanoparticles due to Ge segregation [34][35] at higher temperatures (i.e., Ge-rich SiGe core), which leaves a crystalline Si shell. A similar GIXRD diffractogram was observed by Tuğay et al. [6], for a comparable structure composed of SiGe NCs embedded in a SiO2 matrix fabricated via
Materials nanoarchitectonics at two-dimensional liquid interfaces
Beilstein J. Nanotechnol. 2019, 10, 1559–1587, doi:10.3762/bjnano.10.153
- ) [228]. DHTPA was dissolved in water, and the resulted aqueous solution was layered on top of a chloroform solution of a tetra-substituted amine monomer containing porphyrin. The segregation of the monomers confined the imine formation to the interface and yielded wafer-size multilayer imine-linked COF
Magnetic segregation effect in liquid crystals doped with carbon nanotubes
Beilstein J. Nanotechnol. 2019, 10, 1464–1474, doi:10.3762/bjnano.10.145
- the initial homogeneous planar texture of the liquid crystal–carbon nanotubes mixture is disturbed in a threshold manner (Fréedericksz transition). The orientational and concentration distributions of the suspension are studied for different values of the magnetic field strength and segregation
- tricritical behavior is related to the redistribution of the carbon nanotubes (segregation effect) inside the layer. Keywords: carbon nanotubes; liquid crystal; magnetic field; orientational transitions; segregation effect; Introduction Composites of liquid crystals (LCs) and nanoparticles are actively
- -induced equilibrium transitions in NLC-CNT suspension have been studied. The influence of segregation effects on the nature of the magnetic Fréedericksz transition and the magneto-optical response of a flat layer of the mixture are analyzed. The paper is organized as follows. First, we present the
Multicomponent bionanocomposites based on clay nanoarchitectures for electrochemical devices
Beilstein J. Nanotechnol. 2019, 10, 1303–1315, doi:10.3762/bjnano.10.129
- promotes the homogeneous dispersion of diverse nanoparticulated components. It can be inferred that the disaggregated fibres of sepiolite form an interpenetrated network representing, in the present case, a steric hindrance for GNPs, MWCNTs, and HNTs to aggregate. This avoids phase segregation and particle
Comparing a porphyrin- and a coumarin-based dye adsorbed on NiO(001)
Beilstein J. Nanotechnol. 2019, 10, 874–881, doi:10.3762/bjnano.10.88
- cleavage and annealing. The surface shows extended terraces separated by monoatomic steps that are 210 pm in height. Additionally, some line-shaped defects are observed all over the terraces. These defects, thought to be due to segregation of bulk impurities, were not further investigated in the present
Interaction of Te and Se interlayers with Ag or Au nanofilms in sandwich structures
Beilstein J. Nanotechnol. 2019, 10, 238–246, doi:10.3762/bjnano.10.22
- migrate only in silver. The Te concentration curve clearly suggests that this migration is an effect of the segregation of Te atoms in the silver structure. The differences in crystallinity, as well as the migration process, strongly influence the optical parameters of Ag and Au. In the permittivity of Ag
- deposited on either Te or Se, additional plasmonic bands originating from grain boundary segregation or diffusion occur, while for the Au layer, such resonances were not pronounced. In the permittivity of both materials, the intensity of the interband transition peaks is strongly altered, possibly due to
- the nano-alloy formation, but more likely due to the microstrain on metal grains. Keywords: diffusion; gold; microstrain; nanocrystallinity; permittivity; plasmonics; segregation; selenium; silver; tellurium; Introduction In recent years, there has been growing interest in layered, sandwich-like
Zn/F-doped tin oxide nanoparticles synthesized by laser pyrolysis: structural and optical properties
Beilstein J. Nanotechnol. 2019, 10, 9–21, doi:10.3762/bjnano.10.2
- samples. For instance, regardless of the Zn doping degree, the presence of the main ZnO peak (101) at 2θ ≈ 36.5° was not distinguished. This result highlighted that at this Zn doping level there is no segregation process toward some Zn-rich crystalline phases such as Zn2SnO4. It is worth to noting that
- nanoparticles measured from TEM images. The tendency of the reduction in the mean crystallite size with increasing Zn concentration (without ZnO phase segregation) was also observed for the case of Zn-doped SnO2 nanocrystals prepared by a solid-state reaction from stannous chloride and zinc acetate, yet in this
Ternary nanocomposites of reduced graphene oxide, polyaniline and hexaniobate: hierarchical architecture and high polaron formation
Beilstein J. Nanotechnol. 2018, 9, 2936–2946, doi:10.3762/bjnano.9.272
- (typically above 90 °C) results in the aggregation of the material due to restacking of the hydrophobic rGO layers [34][35]. This is a drawback in the preparation of rGO nanocomposites because phase segregation and/or composition heterogeneity will occur in the final materials. Although it is well known that
Silicene, germanene and other group IV 2D materials
Beilstein J. Nanotechnol. 2018, 9, 2665–2667, doi:10.3762/bjnano.9.248
- beam epitaxy (MBE) [1][2] and at around the same time on zirconium diboride thin films grown on Si(111) substrates by Si segregation through the film [3]. The synthesis of silicene further launched an intensive search for other 2D elemental materials synthesized under ultrahigh vacuum by MBE-like
Other Beilstein-Institut Open Science Activities
