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Search for "alkanes" in Full Text gives 34 result(s) in Beilstein Journal of Nanotechnology.
Two-dimensional molecular networks at the solid/liquid interface and the role of alkyl chains in their building blocks
Beilstein J. Nanotechnol. 2023, 14, 872–892, doi:10.3762/bjnano.14.72
- , namely molecule–molecule, molecule–substrate, and solvent–molecule interactions (Figure 1). The target molecules are dissolved in non-conductive solvents with low volatility, such as 1-phenyloctane, 1,2,4-trichlorobenzene (TCB), long-chain n-alkanes, and octanoic acid [35][36][37]. The physisorbed
- ][54][55]. Recently, dispersion-corrected DFT calculations have quantitatively revealed the interactions between n-alkanes and circumcoronene as models of molecular adsorption on HOPG [47]. As the number of carbon atoms in the n-alkane increased, the adsorption energy increased by −1.85 kcal/mol per
- the entire system. Furthermore, the alkyl chains exhibit lateral interactions upon dense packing, and the dispersion interactions increased by −0.50 kcal/mol per CH2 unit [47]. Although alkyl chains basically follow the HOPG lattice, lattice mismatch between n-alkanes and graphite has been reported
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
- to C=O and C–O stretching of ester groups, respectively. The peak at 1467 cm−1 was associated with the deforming vibrations of the C–H of alkanes [27]. The characteristic peaks of poloxamer 188 were at 3600 cm−1 relative to the O–H stretching, the intense peak at 2873 cm−1 corresponding to C–H
- stretching of alkanes, another intense peak at 1105 cm−1 to the symmetric stretching of C–O–C, and 964–833 cm−1 to asymmetrical and symmetrical stretching of C–C–O, respectively [28]. The NLC-BNZ spectra showed myristyl myristate and poloxamer characteristic peaks (overlapping of the most intense peaks in
Interaction between honeybee mandibles and propolis
Beilstein J. Nanotechnol. 2022, 13, 958–974, doi:10.3762/bjnano.13.84
- cuticle of insects often contains pore canals that transport lipid-containing secretions [45]. Cuticular lipids such as alkanes, alkenes, and fatty acids are present on the head and other body parts of honeybees [46]. Their functions include nestmate recognition and protection against desiccation [46
- ]. More alkanes have been found on the bodies of forager bees compared to nursing bees [47]. Effect of the mandible surface structure on adhesion In some cases, it has been described that microstructures can reduce adhesion by decreasing the contact area [48][49]. The trochanter of ants (Camponotus
Design of a biomimetic, small-scale artificial leaf surface for the study of environmental interactions
Beilstein J. Nanotechnol. 2022, 13, 944–957, doi:10.3762/bjnano.13.83
- developmental stages and other plant organs [50][53][61][63][64][65][66]. Alkanes, which were detected in wheat wax in some other studies, were not a component of the wax examined here [20][52][53][62][63][64]. Developmental changes can have an influence on the wax composition [67][68]. Therefore, the
Comparative molecular dynamics simulations of thermal conductivities of aqueous and hydrocarbon nanofluids
Beilstein J. Nanotechnol. 2022, 13, 620–628, doi:10.3762/bjnano.13.54
- thermophysical properties of nanofluids using a simulation environment. Moreover, this comparison introduces data on aqueous and nonaqueous suspensions in one study. Keywords: alkanes; aqueous solutions; CuO; hydrocarbon solutions; molecular dynamics simulation; nanoparticles; thermal conductivity
- well. Moreover, except for Abid et al. [31], there are not many studies which discuss polar and nonpolar fluid thermal conductivities. However, experimental studies rather than simulations have been carried out. In their study they have not used alkanes; rather, they have used kerosene oil as a
- alkanes. The large-scale atomic/molecular massively parallel simulator (LAMMPS) molecular dynamic package provided by the Sandia group, created by Plimpton et al. [46][47][48], was used for simulating the dispersion of nanoparticles in water and alkanes. The water/CuO system consisted of 463 transferable
A photonic crystal material for the online detection of nonpolar hydrocarbon vapors
Beilstein J. Nanotechnol. 2022, 13, 127–136, doi:10.3762/bjnano.13.9
- hold this array, preventing it from moving apart due to the swelling of the polydimethylsiloxane layer, whereas when exposed to the test alkanes, this does not happen so quickly, and the shift of the lower layers is delayed, resulting in broadening of the photonic bandgap and a less pronounced color
- 280 μm) and (b) response time for normal alkanes (matrix thickness about 90 μm). The dependence of the sensor response rate on the content of toluene in p-xylene (matrix thickness about 100 μm). Reversibility of the response to toluene vapor: (a) position of the reflection maximum: green – before
Molecular assemblies on surfaces: towards physical and electronic decoupling of organic molecules
Beilstein J. Nanotechnol. 2021, 12, 950–956, doi:10.3762/bjnano.12.71
- this Thematic Issue discuss structural templating effects at the solid–liquid interface by systematically looking at the influence of organic decoupling layers. Reynaerts et al. [76] investigated the suitability of long-chain alkanes as physical decoupling layers from a graphite surface. The occurrence
Self-assembly of Eucalyptus gunnii wax tubules and pure ß-diketone on HOPG and glass
Beilstein J. Nanotechnol. 2021, 12, 939–949, doi:10.3762/bjnano.12.70
- ). The wax was mainly composed of the ß-diketone triacontan-14,16-dione and triterpenoids, followed by primary alcohols. Other minor compound classes were secondary alcohols, alkanes, fatty acids, and aldehydes [31]. The used hentriacontan-14,16-dione (97% purity) isolated from barley (Hordeum vulgare L
A review on the green and sustainable synthesis of silver nanoparticles and one-dimensional silver nanostructures
Beilstein J. Nanotechnol. 2021, 12, 102–136, doi:10.3762/bjnano.12.9
- fatty acids in a hydrophobic solvent such as alkanes [235]. There is a water phase inside the microemulsions which is also referred to as the water pool where the reactants are present [235]. The water pool is where the silver ions are reduced into silver atoms which then form AgNPs [152]. The reverse
Growth of a self-assembled monolayer decoupled from the substrate: nucleation on-command using buffer layers
Beilstein J. Nanotechnol. 2020, 11, 1291–1302, doi:10.3762/bjnano.11.113
- ][23][24] are known to influence network formation at the solution–solid interface. One of the unconventional ways to influence the structure formation at the solution–solid interface involves the use of buffer layers. Such buffer layers typically comprise of monolayers formed by long chain alkanes [25
Luminescent gold nanoclusters for bioimaging applications
Beilstein J. Nanotechnol. 2020, 11, 533–546, doi:10.3762/bjnano.11.42
- play an important role in the luminesce properties of NCs [48][55]. For example, a phenylethane thiol (PET)-capped organically soluble Au25 nanocluster (Au25PET18) showed similar behavior as Au25NCs capped with long-chain alkanes [59]. However, it was shown that by choosing the appropriate surface
Materials nanoarchitectonics at two-dimensional liquid interfaces
Beilstein J. Nanotechnol. 2019, 10, 1559–1587, doi:10.3762/bjnano.10.153
- ]. The domain sizes can be tuned by altering the mixing ratio of the two components. In a recent review article by Krafft and co-workers [199], the formation of surface nanodomains and their hierarchical organization with higher complexity with semi-fluorinated alkanes and related molecules (molecules
Ceria/polymer nanocontainers for high-performance encapsulation of fluorophores
Beilstein J. Nanotechnol. 2019, 10, 522–530, doi:10.3762/bjnano.10.53
- alkyl chain length of the alkanes [17][18]. Furthermore, the oxygen quenching is less efficient in high-viscosity media [13]. In bulk fluorescent samples with a dye content between 10−4 and 10−5 M, oxygen quenching does not play a significant role. By applying standard degassing techniques such as
Kinetics of solvent supported tubule formation of Lotus (Nelumbo nucifera) wax on highly oriented pyrolytic graphite (HOPG) investigated by atomic force microscopy
Beilstein J. Nanotechnol. 2018, 9, 468–481, doi:10.3762/bjnano.9.45
- studying the epitaxial growth of organic molecules with aliphatic chains on HOPG which occurs due to the perfectly-matched interatomic distances in the molecules and the HOPG substrate. Watel and coworkers have demonstrated for long chain alkanes a parallel orientation of the carbon skeleton with respect
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
- paves the avenues to oxidation of the ligands which is obvious here through formation of CO and even CO2. Such a scenario is supported by the fact that Pt complexes in aqueous solution are catalysts for oxidation of alkanes and other organic compounds [30]. Electron-induced reactions involving OH
Surfactant-induced enhancement of droplet adhesion in superhydrophobic soybean (Glycine max L.) leaves
Beilstein J. Nanotechnol. 2017, 8, 2345–2356, doi:10.3762/bjnano.8.234
- ]. Epicuticular wax can either appear as a flat film covering the cuticle, or as a three-dimensional wax structure of various shapes having crystalline structure [15][16]. Cuticular wax, as defined in biology, represents a mixture of long-chain aliphatic hydrocarbons, such as alkanes, aldehydes, primary alcohols
- ). The amount of total extracted wax slightly increases for the following extraction steps, reaching a plateau (2.8 ± 0.36 µg/cm2) at 30 s. The solubility of the compound classes of fatty acids, alkyl esters, methylated alkyl esters and alkanes is constant with a dipping time of 10 s. Only for the
- ) primary fatty acids (C16–C32), 0.14 ± 0.06 µg/cm2 alkyl esters (C42–C46), (0.09 ± 0.05 µg/cm2) methylated alkyl esters (C24–C28) and (0.06 ± 0.04 µg/cm2) alkanes (C27–C31), were found. Wettability The wettability of Glycine max L. leaf surfaces was characterized by measuring the static contact angle and
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
- number of possibilities exist. Crosslinking of loosely attached spin-cast alkane films to generate mechanically robust films has been induced by the formation of carbon-centered radicals upon bombardment with hydrogen atoms [42] and protons [43] while the crosslinking of liquid alkanes has been
Investigation of growth dynamics of carbon nanotubes
Beilstein J. Nanotechnol. 2017, 8, 826–856, doi:10.3762/bjnano.8.85
- be maintained by the exothermic catalytic decomposition of the precursor molecules and the endothermic precipitation of carbon at opposing face of the catalyst particle. However, these requirements are not met in the case of endothermic decomposition of for instance alkanes [33][35][36][37] and the
Structural and tribometric characterization of biomimetically inspired synthetic "insect adhesives"
Beilstein J. Nanotechnol. 2017, 8, 45–63, doi:10.3762/bjnano.8.6
- analyses of the tarsal adhesives of the locust Schistocerca gregarina [15] and the Madagascan hissing cockroach Gromphadorrhina portentosa [16][17] have confirmed that the lipoid phase of their adhesives consists of n-alkanes (in the range of C23–C49 in S. gregaria and C27–C34 in G. portentosa), internally
- branched monomethyl-, dimethyl- and trimethyl- (the latter substance in S. gregaria only) alkanes and long-chain fatty acids and aldehydes (in S. gregaria only). In the tarsal adhesives of the hairy adhesive systems of the frog beetle Sagra femorata and carrion beetles of the genus Nicrophorus, Gerhardt et
- al. [17] have established a hydrocarbon spectrum in the C-range between C18 and C39 including n-alkanes, mono-, di-, tri- and tetramethyl branched alkanes, alkenes, alkadienes and one aldehyde (the latter substance in S. femortata only). The established long-chain n-alkanes suggest a semi-solid
Solvent-mediated conductance increase of dodecanethiol-stabilized gold nanoparticle monolayers
Beilstein J. Nanotechnol. 2016, 7, 2057–2064, doi:10.3762/bjnano.7.196
- EtOH and THF rather points towards interdigitation than a collapse of alkyl tails. Badia et al. already suggested interdigitation of alkanes surrounding gold nanoparticles and found a temperature dependence on the alkyl chain ordering by transmission electron microscopy [21]. On flat surfaces alkane
Rigid multipodal platforms for metal surfaces
Beilstein J. Nanotechnol. 2016, 7, 374–405, doi:10.3762/bjnano.7.34
- significantly affect the charge transport properties of the molecular junctions [55]. Nevertheless, these anchoring groups have been explored most frequently when attached to core structures that are not highly conjugated and exhibit poor conductivity (e.g., saturated alkanes) [26][30][56]. In contrast, highly
Effects of electronic coupling and electrostatic potential on charge transport in carbon-based molecular electronic junctions
Beilstein J. Nanotechnol. 2016, 7, 32–46, doi:10.3762/bjnano.7.4
- absence of the AB molecule. In order to assess the effects of molecular structure on electronic coupling, several series of oligomers between G9 fragments were calculated, which differ in the degree of conjugation, including alkanes, alkene, and alkynes, with the results summarized in Table 4 and Figure 7
- energies and coupling calculated for both the optimized and planar configurations for a wide range of model structures. The G9 rings were close to coplanar for both the optimized and planar structures, and some of the alkanes were chosen to be rigid, such as cyclohexane and decalin. For the conjugated
- separation of the G9 “contacts” increases, and logically must reach zero at infinite molecular layer thickness. The increase in coupling with distance calculated for alkenes and alkynes is unexpected, although it is small compared to the differences between alkanes, vacuum, and aromatics. The alkene and
Vibration-mediated Kondo transport in molecular junctions: conductance evolution during mechanical stretching
Beilstein J. Nanotechnol. 2015, 6, 2417–2422, doi:10.3762/bjnano.6.249
- from electron–vibration interaction, to junction stretching. Interestingly, for off-resonance electron–vibration interaction, it was shown that stretching of simple atomic scale junctions such as suspended gold atomic chains or molecular junctions based on n-alkanes can increase the inelastic
Entropy effects in the collective dynamic behavior of alkyl monolayers tethered to Si(111)
Beilstein J. Nanotechnol. 2015, 6, 583–594, doi:10.3762/bjnano.6.60
- of 52 ± 5 meV for the activation energy of Δε (B2) (Figure 7). This trans–gauche isomerization energy for tethered n-alkyl chains is larger than the value deduced from the density of vibrational states for short n-alkanes in the liquid phase (34 meV) [55][56] and comparable to that of perfluoro-n
- -alkanes (44 meV) [57]. However, an accurate quantification of the number of gauche defects would require an estimate of the dipole moments for all non-centrosymmetric methylene conformations, which will depend on details of the trans–gauche sequences. Vibrational spectroscopy and molecular dynamics
- Thermal bath excitations (227 ± 10 cm−1) revealed by dipolar relaxation dynamics can be compared with vibrational energies of n-alkanes, either in the liquid phase or in a two-dimensionally tethered phase. For n-alkanes in the liquid phase, low vibration energies correspond to skeletal deformations, i.e
The influence of molecular mobility on the properties of networks of gold nanoparticles and organic ligands
Beilstein J. Nanotechnol. 2014, 5, 1664–1674, doi:10.3762/bjnano.5.177
- switchable molecular devices [11][12]. The process can also be used for non-thiol ligands [13]. Here, we extend this self-assembly procedure beyond alkanes, making use of an attractive class of molecular ligands. Molecules of the tridentate 2,6-bi(pyrazolyl)pyridine (BPP) group are well known to act as weak
- molecular exchange [9][30]. We note that the latter type of arrays does contain a mixture of OPE molecules and alkanes, unlike our Au-NP–S-BPP arrays. Room-temperature Raman spectroscopy of 2D Au-NP–S-BPP arrays In order to get more insight into the binding of the S-BPP molecules to the gold as well as to
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