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Search for "methyl groups" in Full Text gives 36 result(s) in Beilstein Journal of Nanotechnology.
Bioinspired nanofilament coatings for scale reduction on steel
Beilstein J. Nanotechnol. 2025, 16, 25–34, doi:10.3762/bjnano.16.3
- polymerization of a polysiloxane on the material surface [18]. The polysiloxane methyl groups lower the surface energy and render the surface hydrophobic. Clearly, the surface chemistry of steel surfaces is very different from the previously used materials such as glass [11][12][13][18], polymers [10][11][12
Cholesterol nanoarchaeosomes for alendronate targeted delivery as an anti-endothelial dysfunction agent
Beilstein J. Nanotechnol. 2024, 15, 517–534, doi:10.3762/bjnano.15.46
- IL-6 and IL-8 by HUVECs even in the presence of TNF-α. Results Characterization of ALN-loaded nanovesicles The structural features of ALN-loaded nanovesicles are shown in Table 1. As reported previously, nanoarchaeosome bilayers contain archaeolipids displaying methyl groups perpendicular to their
A combined gas-phase dissociative ionization, dissociative electron attachment and deposition study on the potential FEBID precursor [Au(CH3)2Cl]2
Beilstein J. Nanotechnol. 2023, 14, 1178–1199, doi:10.3762/bjnano.14.98
- of methyl groups, is observed. The first progression is that of the molecular cation at m/z 524 followed by a sequential loss of methyl ligands, appearing at m/z 509, 494, 479, and 464, with the most significant contribution being from the loss of all four methyl ligands at m/z 464. The second
- one gold atom, and two and three methyl groups and is observed at m/z 227 and 225, 212 and 197, respectively. From these, m/z 225 is ascribed to the loss of two methyl groups and two additional hydrogens, and 197 represents Au+ (i.e., the elemental gold). Additionally, m/z 247 is observed with fair
- , which is ≈0.2 eV above the upper confidence limit for the experimental AE. For the loss of one methyl group, m/z 509, we find the intensity too low to determine the AE. However, for the loss of two methyl groups, m/z 494, we find an AE of 9.7 ± 0.3 eV. Considering only single bond ruptures (i.e., the
Bismuth-based nanostructured photocatalysts for the remediation of antibiotics and organic dyes
Beilstein J. Nanotechnol. 2023, 14, 291–321, doi:10.3762/bjnano.14.26
Detecting stable adsorbates of (1S)-camphor on Cu(111) with Bayesian optimization
Beilstein J. Nanotechnol. 2020, 11, 1577–1589, doi:10.3762/bjnano.11.140
- . With BOSS, we first identify the global minimum camphor conformer without the Cu(111) surface with a 3D search of methyl group rotations (Figure 3a). We normalize the lengths and angles of the C–H bonds in the three methyl groups by setting them to identical values, based on their average lengths and
- angles (see Supporting Information File 1). With this, we obtain an ideal camphor geometry with three identical minima in the methyl group rotation (i.e., 120° periodicity). We then study the rotation of the methyl groups in the ranges θ, φ, ω ∈ [−60, 60]°. With the identified global minimum conformer
- minimum at (θ, φ, ω) = (−3, 7, −3)°, and an energy barrier of 0.1 eV for the rotation of the methyl groups. Given this barrier, the rotation of the methyl groups Δφ away from the global minimum is expected to be small at room temperature. The Arrhenius law predicts that in 50% of the molecules Δφ < 10
Cu2O nanoparticles for the degradation of methyl parathion
Beilstein J. Nanotechnol. 2020, 11, 1546–1555, doi:10.3762/bjnano.11.137
- -nitrophenol. The peaks at 3.45 and 3.48 ppm are the methyl groups of phosphate, which show coupling to phosphorous, and the peak at 4.65 ppm is due to the HDO produced by the deuterium interchange with the hydroxyl group of 4-nitrophenol. D2O was used as solvent for 1H NMR instead, of CDCl3 like in 31P NMR
Nanoparticles based on the zwitterionic pillar[5]arene and Ag+: synthesis, self-assembly and cytotoxicity in the human lung cancer cell line A549
Beilstein J. Nanotechnol. 2020, 11, 421–431, doi:10.3762/bjnano.11.33
- both primary and tertiary amino groups were used as aminating agents [30]. In this work, we used commercially available N,N-dimethylethylenediamine, because there are no side reactions due to the presence of two methyl groups, and the process of further quaternization proceeds under mild conditions [31
- , as well as cross peaks between the protons of the methyl groups of the ammonium fragment H6 and the protons of the methylene bridge H2, and cross peaks between the protons of the sulfobetaine fragment H8 and the hydroxymethylene protons H3 in the case of macrocycle 3 in the 2D 1H,1H-NOESY NMR
Hydrophilicity and carbon chain length effects on the gas sensing properties of chemoresistive, self-assembled monolayer carbon nanotube sensors
Beilstein J. Nanotechnol. 2019, 10, 565–577, doi:10.3762/bjnano.10.58
- SAMs. The nature of these interactions is still the subject of debate. While weak intermolecular attractive forces could be responsible for these interactions, some authors maintain that the formation of hydrogen bonds between the methyl groups present in the thiol molecules and the gas species cannot
Dynamics and fragmentation mechanism of (C5H4CH3)Pt(CH3)3 on SiO2 surfaces
Beilstein J. Nanotechnol. 2018, 9, 711–720, doi:10.3762/bjnano.9.66
- bonds directly to three methyl groups and a methylated cyclopentadienyl ring is a widely used precursor to obtain Pt deposits. Although the dissociation mechanism of (C5H4CH3)Pt(CH3)3 leading to the Pt deposit remains unknown, studies for a family of precursors similar to (C5H4CH3)Pt(CH3)3 in atomic
- methylcyclopentadienylring and two of the methyl groups that are directly bonded to Pt are oriented towards the substrate [14]. In a similar way, the bonding of (C5H4CH3)Pt(CH3)3 precursor molecules on partially hydroxylated SiO2 surfaces were investigated. The initial configurations of (C5H4CH3)Pt(CH3)3 considered for
- three of the methyl groups bonded to Pt or the centroid of the methylcyclopentadienyl ring bonds to the substrate. These initial configurations are allowed to relax without any constraints. The configurations where (C5H4CH3)Pt(CH3)3 is placed on the bridging sites move spontaneously to on-top sites
Electron-driven and thermal chemistry during water-assisted purification of platinum nanomaterials generated by electron beam induced deposition
Beilstein J. Nanotechnol. 2018, 9, 77–90, doi:10.3762/bjnano.9.10
- 50% of its initial value. At this stage of decomposition, a significant percentage of the precursor molecules must have lost at least one of their methyl groups. We note that the same products desorb as seen in Figure 3 despite the lower electron energy applied here. This is in accord with the result
Patterning of supported gold monolayers via chemical lift-off lithography
Beilstein J. Nanotechnol. 2017, 8, 2648–2661, doi:10.3762/bjnano.8.265
- patterned PDMS [38]. The patterns of circles seen in the AFM adhesion maps in Figure 3C,E are consistent with differential molecular compositions in the lifted-off vs non-lifted-off regions and the chemically selective removal of molecules terminating in hydroxyl groups and not methyl groups during the
Application of visible-light photosensitization to form alkyl-radical-derived thin films on gold
Beilstein J. Nanotechnol. 2017, 8, 1863–1877, doi:10.3762/bjnano.8.187
- contact with the terminal methyl groups of the crystalline film. This suggests that Au–Me and Au–NHBoc films in this study are relatively disordered and that water droplets are in contact with the methylene-rich chains derived from Phth–Me and Phth–NHBoc. Indeed, the water contact angle measured on low
Self-assembly of chiral fluorescent nanoparticles based on water-soluble L-tryptophan derivatives of p-tert-butylthiacalix[4]arene
Beilstein J. Nanotechnol. 2017, 8, 1825–1835, doi:10.3762/bjnano.8.184
- , 11) form a different secondary structure in water, i.e., additional packing of tryptophan fragments in dimer formations is observed for the compounds 8 and 9 with methyl groups at the nitrogen atom, which leads to changes in the form of the CD spectrum. The optical activity of the systems was also
Deposition of exchange-coupled dinickel complexes on gold substrates utilizing ambidentate mercapto-carboxylato ligands
Beilstein J. Nanotechnol. 2017, 8, 1375–1387, doi:10.3762/bjnano.8.139
- that van der Waals interactions exist between the Au surface and the alkyl (methylene and methyl) groups of the supporting ligands. Transport measurements In orienting experiments, the deposition of complex 2 on gold was further investigated by transport measurements using an approach based on self
Assembly of metallic nanoparticle arrays on glass via nanoimprinting and thin-film dewetting
Beilstein J. Nanotechnol. 2017, 8, 1049–1055, doi:10.3762/bjnano.8.106
- metallic thin films at high temperatures. Hybrid sol–gel thin films prepared from methyltriethoxysilane (MTEOS) may fulfill these requirements due to the complete hydrolyzation of the ethoxy groups and decomposition of the methyl groups [16][17]. MTEOS films have attracted attention as self-sustainable
3D Nanoprinting via laser-assisted electron beam induced deposition: growth kinetics, enhanced purity, and electrical resistivity
Beilstein J. Nanotechnol. 2017, 8, 801–812, doi:10.3762/bjnano.8.83
- ) along with smaller contributions from other reaction pathways [44]. After this initial cleavage event, subsequent electron exposure enables further decomposition of the precursor, ultimately allowing the removal of more methyl groups, though still falling short of complete removal. There is a different
Association of aescin with β- and γ-cyclodextrins studied by DFT calculations and spectroscopic methods
Beilstein J. Nanotechnol. 2017, 8, 348–357, doi:10.3762/bjnano.8.37
- host’s H5 and several protons ascribed to the triterpenic moiety of aescin and some of its methyl groups, namely H1, H19, H27 and methylene protons H23, H29 and H30 (see Figure 5 for labelling) [31]. In the region associated with protons H2 and H4 of γ-CD, some correlations with aescin triterpenic
Tailoring bifunctional hybrid organic–inorganic nanoadsorbents by the choice of functional layer composition probed by adsorption of Cu2+ ions
Beilstein J. Nanotechnol. 2017, 8, 334–347, doi:10.3762/bjnano.8.36
- molecular structure of the surfaces. It was demonstrated that the introduction of short hydrophobic (methyl) groups improves the kinetic characteristics of the samples during the sorption of copper(II) ions and promotes fixation of aminopropyl groups on the surface of silica microspheres. The introduction
- was optimized controlling the synthesis conditions, such as concentrations of reactants, basicity of the medium, and the process temperature. Keywords: copper(II) ions; methyl groups; N- and F-containing functional groups; silica nanospheres; sol–gel processes; sorption; surface chemistry
- surface layer inserting instead different hydrolytically stable hydrophobic functions, hindering the formation of H-bonds. We have applied two types of such groups, namely small ones with considerably reduced capacity to van der Waals bonding such as methyl groups, and rather large and long ones with
Nanoscale isoindigo-carriers: self-assembly and tunable properties
Beilstein J. Nanotechnol. 2017, 8, 313–324, doi:10.3762/bjnano.8.34
- in SDS micelles. For isoindigo derivatives with two alkyl tails, the highest solubilization occurs for compound 2a, i.e. for isoindigo with two methyl groups. It is important to note that unlike the other tested compounds, 2a has the highest extinction coefficient of ε = 13447 M−1·cm−1 (λmax = 395 nm
Rigid multipodal platforms for metal surfaces
Beilstein J. Nanotechnol. 2016, 7, 374–405, doi:10.3762/bjnano.7.34
- ., disulfides and sulfones), the adsorption of 22-C1 lead to monolayer films with ≈90% of the sulfur atoms bound to gold, and no oxidized sulfur species were observed. This behavior is attributed to the presence of the methyl groups in 22-C1, which stabilized the cyclohexane conformation and enhanced the
Characterisation of thin films of graphene–surfactant composites produced through a novel semi-automated method
Beilstein J. Nanotechnol. 2016, 7, 209–219, doi:10.3762/bjnano.7.19
- to the polar head group), which is pulled away from it by the polar head group and therefore does not undergo as much of a shielding effect in the SDS–graphene complex. Additionally, for the CTAB–graphene complex, two of the methyl groups on the quaternary amine are interacting with the graphene
Single-molecule magnet behavior in 2,2’-bipyrimidine-bridged dilanthanide complexes
Beilstein J. Nanotechnol. 2016, 7, 126–137, doi:10.3762/bjnano.7.15
- diffraction. Dy(III) ions are marked in purple, oxygen in red, nitrogen in blue and carbon in dark grey. Hydrogen and methyl groups are omitted for clarity. Thermal ellipsoid of C, N and O (50% probability), whilst Dy is represented employing 99% probability. (a) Experimental χMT(T) and fitting (red trace
Surface-site reactivity in small-molecule adsorption: A theoretical study of thiol binding on multi-coordinated gold clusters
Beilstein J. Nanotechnol. 2016, 7, 53–61, doi:10.3762/bjnano.7.6
- for various sites. Kink sites were preferred binding locations due to the availability of multiple surface atoms for dispersive interactions with the methyl groups, whereas tip sites experienced low affinity, despite having low coordination numbers. Keywords: coordination; gold clusters; methylthiol
- , we focus, in the current work, on the surface-binding groups. To this end, we replaced molecular backbones with methyl groups, in order to remove factors such as lone-pair or charge-group surface interactions, and the overall backbone–surface interaction. We designed a 20-atom Au cluster, with gold
- optimization of the methyl group interactions. The structures of the most stable configurations reported in Table 1 are shown in Figure 2. Methyl groups experienced weak dispersive binding to Au atoms in the facets neighboring the binding site, with nearest C–Au distances around 3.3–3.7 Å in the most stable
Negative differential electrical resistance of a rotational organic nanomotor
Beilstein J. Nanotechnol. 2015, 6, 2332–2337, doi:10.3762/bjnano.6.240
- branch. The backbone consists of five interconnected phenyl rings with attached methyl groups to prevent the backbone from twisting and is stabilized at either end by a fullerene, C60 terminating group. The C60 at either end not only stabilizes the molecule, but also allows the molecule to appear more
Controlled switching of single-molecule junctions by mechanical motion of a phenyl ring
Beilstein J. Nanotechnol. 2015, 6, 2088–2095, doi:10.3762/bjnano.6.213
- introducing one or two methyl groups into the phenyl ring at the meta positions (m-cresoxy and 3,5-xylenoxy, respectively). The corresponding STM images are shown in Figure 7a–c along with that of PhO for comparison. The methyl group on the phenyl ring appears bright, and the molecules coexisting on the
- surface can therefore be discriminated by their images. Figure 7d and Figure 7e compare typical I–Δz curves for these molecules with those obtained on PhO with an identical tip apex, clearly demonstrating the impact of the methyl groups on the conductance, which increases as much as ≈20% and ≈35% for m
- -cresoxy and 3,5-xylenoxy, respectively (Figure 7f). This effect can be understood as an electrostatic consequence of electron-donating methyl groups that push up the π orbitals, resulting in an increased conductance because of a negative slope in the transmission around EF (Figure 6a). Thus, an increase
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