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Search for "dynamics" in Full Text gives 499 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Spontaneous shape transition of MnxGe1−x islands to long nanowires

  • S. Javad Rezvani,
  • Luc Favre,
  • Gabriele Giuli,
  • Yiming Wubulikasimu,
  • Isabelle Berbezier,
  • Augusto Marcelli,
  • Luca Boarino and
  • Nicola Pinto

Beilstein J. Nanotechnol. 2021, 12, 366–374, doi:10.3762/bjnano.12.30

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  • using these techniques, NWs are grown away from the substrate, usually in a tilted direction, and size distribution and geometry strongly depend on the growth dynamics [32][33]. Furthermore, it is known that the catalyst introduces uncontrolled and unwanted contamination inside the crystal lattice of
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Published 28 Apr 2021

Intracranial recording in patients with aphasia using nanomaterial-based flexible electronics: promises and challenges

  • Qingchun Wang and
  • Wai Ting Siok

Beilstein J. Nanotechnol. 2021, 12, 330–342, doi:10.3762/bjnano.12.27

Graphical Abstract
  • has an excellent temporal resolution at the millisecond scale. ECoG data have a typical sampling rate of 1,000–3,000 Hz. This high temporal resolution offers an opportunity to observe the rapid dynamics of neural activities in precisely localized brain regions. ECoG has a much higher signal-to-noise
  • , iEEG is a promising method to reveal the dynamics of natural semantic processing. Khachatryan et al. [64] recorded neural signals from the scalp and cortex of nine epileptic subjects to study the activation of semantic and perceptual priming (Figure 4). Patients completed a semantic judgment task and
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Published 08 Apr 2021

Differences in surface chemistry of iron oxide nanoparticles result in different routes of internalization

  • Barbora Svitkova,
  • Vlasta Zavisova,
  • Veronika Nemethova,
  • Martina Koneracka,
  • Miroslava Kretova,
  • Filip Razga,
  • Monika Ursinyova and
  • Alena Gabelova

Beilstein J. Nanotechnol. 2021, 12, 270–281, doi:10.3762/bjnano.12.22

Graphical Abstract
  • or cytoskeleton dynamics was quantified by atomic absorption spectroscopy (AAS) and the uptake was verified by fluorescent microscopy. The uptake route of the tested MNPs differed depending on the surface coating. While BSA-SO-MNPs were internalized via CME, PEG-SO-MNPs were preferentially taken up
  • experiments, cells were exposed to MNPs in a medium supplemented with 2% FBS. A549 cells up to 20 generations (passaged two times per week) were used in the experiments. Treatment of cells After reaching exponential growth, cells were pre-treated with inhibitors of endocytosis or cytoskeleton dynamics for 1 h
  • additional time of 1 h. Cell exposure was finished by sucking off the culture medium and washing the cells twice with phosphate-buffered saline (PBS). An illustration of the treatment is shown in Figure 4. The final concentrations of individual inhibitors of endocytosis or cytoskeleton dynamics were prepared
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Published 23 Mar 2021

The nanomorphology of cell surfaces of adhered osteoblasts

  • Christian Voelkner,
  • Mirco Wendt,
  • Regina Lange,
  • Max Ulbrich,
  • Martina Gruening,
  • Susanne Staehlke,
  • Barbara Nebe,
  • Ingo Barke and
  • Sylvia Speller

Beilstein J. Nanotechnol. 2021, 12, 242–256, doi:10.3762/bjnano.12.20

Graphical Abstract
  • capability of apical membrane features and fluctuation dynamics in aiding the assessment of adhesion and migration properties on a single-cell basis. Keywords: cell adhesion; membrane fluctuations; osteoblast; plasma membrane nanomorphology; scanning ion conductance microscopy (SICM); Introduction
  • of 0.3–0.5 features per μm2, are observed. The characteristic dynamics of the sheets is fast compared to the acquisition leading to temporal undersampling. This results in distortions, which is particularly evident in Figure 2e where the ruffles appear as blurred bright spots. This becomes obvious
  • when the live-cell dynamics is suppressed upon fixation of the osteoblasts with 4% paraformaldehyde (PFA). Figure 3a shows an example of a respective SICM topography. Now, the ruffles exhibit a clearer shape and resemble similar features to those observed with electron microscopy [29][30]. Our data
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Published 12 Mar 2021

The role of gold atom concentration in the formation of Cu–Au nanoparticles from the gas phase

  • Yuri Ya. Gafner,
  • Svetlana L. Gafner,
  • Darya A. Ryzkova and
  • Andrey V. Nomoev

Beilstein J. Nanotechnol. 2021, 12, 72–81, doi:10.3762/bjnano.12.6

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  • composition; however, the size of the resulting particles varies significantly. To solve this issue, we studied the formation of Cu–Au nanoparticles with different chemical compositions from a gaseous medium using computer molecular dynamics (MD) simulation. The aim was to determine the effect of the
  • initial vapor phase, basically corresponded to a given target composition. Keywords: binary nanoparticles; computer simulation; copper; gold; molecular dynamics; Introduction The nanometer-sized Cu–Au compounds are being studied quite actively [1][2][3][4][5][6][7][8] because of their potential
  • dynamics (MD) method, which allows us to analyze the behavior of the simulated system over a wide time interval (from picoseconds to several nanoseconds) and with the accuracy required to consider small atomic groups. This type of modeling can only be successful if a sufficiently realistic potential of
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Published 19 Jan 2021

Effect of different silica coatings on the toxicity of upconversion nanoparticles on RAW 264.7 macrophage cells

  • Cynthia Kembuan,
  • Helena Oliveira and
  • Christina Graf

Beilstein J. Nanotechnol. 2021, 12, 35–48, doi:10.3762/bjnano.12.3

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  • -coated UCNPs on RAW 264.7 macrophages, an analysis of the cell cycle dynamics of UCNP@thin_NH2 and UCNP@thick_NH2 samples was carried out. The cell cycle consists of four parts: The rest phase (G0); the first gap phase (G1), in which the cells grow and produce enzymes necessary for cell division; the
  • @thin_NH2 sample and 0.35 ± 0.14 for the UCNP@thick_NH2 sample) compared to the control (0.53 ± 0.06). In contrast to this observation, the silica particles without a UCNP core (sample NP@SiO2-RBITC-NH2) exhibit similar cell-cycle dynamics as the nanoparticle-free control (Figure S4, Supporting Information
  • the control is marked by a yellow-framed peak. (B) Summary of mean SSC flow cytometry measurements on all samples in RAW 264.7 cells after particle exposure for 24 h at 37 °C. Effect of (A) UC@thin_NH2 (tSiO2 = 8 ± 2 nm) and (B) UC@thick_NH2 (tSiO2 = 21 ± 2 nm) on the cell cycle dynamics of RAW 264.7
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Published 08 Jan 2021

Scanning transmission imaging in the helium ion microscope using a microchannel plate with a delay line detector

  • Eduardo Serralta,
  • Nico Klingner,
  • Olivier De Castro,
  • Michael Mousley,
  • Santhana Eswara,
  • Serge Duarte Pinto,
  • Tom Wirtz and
  • Gregor Hlawacek

Beilstein J. Nanotechnol. 2020, 11, 1854–1864, doi:10.3762/bjnano.11.167

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  • channeling effect in the HIM has also been studied using Monte Carlo [21] and molecular dynamics [22] simulations. Measuring the energy of the transmitted particles is a novel technique that adds an information channel to the previously discussed transmission imaging modes. It will provide information on the
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Published 11 Dec 2020

Nanomechanics of few-layer materials: do individual layers slide upon folding?

  • Ronaldo J. C. Batista,
  • Rafael F. Dias,
  • Ana P. M. Barboza,
  • Alan B. de Oliveira,
  • Taise M. Manhabosco,
  • Thiago R. Gomes-Silva,
  • Matheus J. S. Matos,
  • Andreij C. Gadelha,
  • Cassiano Rabelo,
  • Luiz G. L. Cançado,
  • Ado Jorio,
  • Hélio Chacham and
  • Bernardo R. A. Neves

Beilstein J. Nanotechnol. 2020, 11, 1801–1808, doi:10.3762/bjnano.11.162

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  • methods; atomic force microscopy (AFM); molecular dynamics (MD); Raman spectroscopy; nanostructured materials; Introduction Layered materials such as graphite, talc, and transition metal dichalcogenides (TMDs), held together by strong covalent bonds within layers and relatively weak van der Waals
  • been obtained through radial deformations [32], lattice dynamics studies [33], deformations of suspended layers [2][6], and bubble profiles [12]. The values reported for the bending stiffness of a graphene monolayer vary from 0.8 to 10,000 eV [34]. Also, there is no consensus on how κ varies with the
  • folded 2D material. In principle, the model describes any 2D material, and its predictions are corroborated by comparison with classical molecular dynamics simulations and to results of previous investigations on graphene and talc. Because folds naturally occur in flakes of varying thickness
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Published 30 Nov 2020

Molecular dynamics modeling of the influence forming process parameters on the structure and morphology of a superconducting spin valve

  • Alexander Vakhrushev,
  • Aleksey Fedotov,
  • Vladimir Boian,
  • Roman Morari and
  • Anatolie Sidorenko

Beilstein J. Nanotechnol. 2020, 11, 1776–1788, doi:10.3762/bjnano.11.160

Graphical Abstract
  • molecular dynamics method using the many-particle potential of the modified embedded-atom method. In the calculation process the temperature was controlled using the Nose–Hoover thermostat. The simulation of the atomic nanolayer formation was performed by alternating the directional deposition of different
  • atomic structures depending on the main parameters of the deposition process. Keywords: hybrid nanostructure; mathematical modeling; modified embedded-atom method; molecular dynamics; spintronics; spin valve; vacuum deposition; Introduction Multilayer superconductor/ferromagnetic (S/F) hybrid
  • spintronics applications were studied by the molecular dynamics method [33][34]. Molecular dynamics describes the motion of each nanosystem atom at a certain point in time, therefore, it is possible to reproduce the detailed evolution of nanoelements and their properties. The basis of the method is the
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Published 24 Nov 2020

Selective detection of complex gas mixtures using point contacts: concept, method and tools

  • Alexander P. Pospelov,
  • Victor I. Belan,
  • Dmytro O. Harbuz,
  • Volodymyr L. Vakula,
  • Lyudmila V. Kamarchuk,
  • Yuliya V. Volkova and
  • Gennadii V. Kamarchuk

Beilstein J. Nanotechnol. 2020, 11, 1631–1643, doi:10.3762/bjnano.11.146

Graphical Abstract
  • finding the complete composition of the breath, the concentration of its components, and the temporal dynamics of the changes in breath composition. In the case of a medium with more than 2000 components, this is a difficult task even for the most modern sensor devices. This problem is solved by using
  • the sensing element. A condensate film formed on the gas-sensing surface switches on the autonomous power supply of the sensing element, enabling the observation and measurement of the dynamics of resistance variation during the exposure and relaxation periods. This is due to the fact that, in the
  • prospects are opening for more detailed studies regarding the dynamics of the emotional states when various factors simultaneously affect the state of the organism, and our preliminary investigation confirms that. Due to the instability of the hormonal molecules, the validity of the conclusions and medical
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Published 28 Oct 2020

Design of V-shaped cantilevers for enhanced multifrequency AFM measurements

  • Mehrnoosh Damircheli and
  • Babak Eslami

Beilstein J. Nanotechnol. 2020, 11, 1525–1541, doi:10.3762/bjnano.11.135

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  • dynamics of the cantilever compared to other parameters. This work shows that in order to maximize the phase contrast, the ratio of second to first eigenmode frequencies should be minimized and be close to a whole number. Additionally, since V-shaped cantilevers are mostly used for soft matter imaging
  • dynamics of the cantilever more accurately. Wang et al. have used the finite element method (FEM) as an alternative approach to obtain the stiffness and the natural frequencies of for both rectangular and V-shaped cantilevers [9]. Additionally, other studies were done by Cleveland et al. [10] to measure
  • bimodal AFM [43]. Additionally, in order to have a better understanding of the dynamics of the AFM cantilever in this study, tip–sample force interactions on Au and PS samples are simulated and presented in Supporting Information File 1, Figure S1. In order to study the effect of the length of the
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Published 06 Oct 2020

Controlling the electronic and physical coupling on dielectric thin films

  • Philipp Hurdax,
  • Michael Hollerer,
  • Larissa Egger,
  • Georg Koller,
  • Xiaosheng Yang,
  • Anja Haags,
  • Serguei Soubatch,
  • Frank Stefan Tautz,
  • Mathias Richter,
  • Alexander Gottwald,
  • Peter Puschnig,
  • Martin Sterrer and
  • Michael G. Ramsey

Beilstein J. Nanotechnol. 2020, 11, 1492–1503, doi:10.3762/bjnano.11.132

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  • physical coupling to the substrate induced by the charge transfer. Finally, the charging effect on the thermal dynamics and the stability of the 6P monolayer are considered. Results and Discussion Ambivalent behavior of 6P on regularly prepared MgO(100)/Ag(100) thin films Figure 2 shows STM images of four
  • emission) where the emission of the 6P sigma-orbitals is found, as To assess the desorption dynamics, the samples were heated manually by a filament behind the crystal at a very low heating rate of approximately 0.1 °C/s (on average). STM measurements were performed at −193 °C with a Createc low
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Published 01 Oct 2020

Transient coating of γ-Fe2O3 nanoparticles with glutamate for its delivery to and removal from brain nerve terminals

  • Konstantin Paliienko,
  • Artem Pastukhov,
  • Michal Babič,
  • Daniel Horák,
  • Olga Vasylchenko and
  • Tatiana Borisova

Beilstein J. Nanotechnol. 2020, 11, 1381–1393, doi:10.3762/bjnano.11.122

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  • nanoparticles. Also, its dynamics and stability in a standard salt solution, physiological fluids, and in the presence of certain compounds were measured. This approach allows for the evaluation of glutamate delivery to and removal from nerve terminals and blood plasma for modulation of extracellular glutamate
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Published 10 Sep 2020

Atomic defect classification of the H–Si(100) surface through multi-mode scanning probe microscopy

  • Jeremiah Croshaw,
  • Thomas Dienel,
  • Taleana Huff and
  • Robert Wolkow

Beilstein J. Nanotechnol. 2020, 11, 1346–1360, doi:10.3762/bjnano.11.119

Graphical Abstract
  • -terminated tips In Figure 3, we compare AFM line profiles taken across the defect of interest (blue) and a corresponding defect-free region (grey) with a simple theoretical structure optimized by molecular dynamics calculations (see Methods for parameters). A preliminary comparison of Figure 3 with the
  • above the defect in 4t show a reduced minimum, as well as a horizontal shift in position towards the defect centre due to a polaronic distortion induced by the vacancy’s localized negative charge. Molecular dynamics relaxation was unable to capture this effect as part of the modelling, so the ball and
  • terminations. The defect free H–Si ball and stick model was the same as used in [43], with defects manually inserted using Avogadro [94][95]. The geometry of the defect atoms within the lattice were optimized using molecular dynamics relaxation with a Merck molecular force field (MMFF94) [96]. Images of the
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Published 07 Sep 2020

Magnetohydrodynamic stagnation point on a Casson nanofluid flow over a radially stretching sheet

  • Ganji Narender,
  • Kamatam Govardhan and
  • Gobburu Sreedhar Sarma

Beilstein J. Nanotechnol. 2020, 11, 1303–1315, doi:10.3762/bjnano.11.114

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  • manufacturing [3], food industry [4], and in many other fields. In this regard, fluid dynamics is essential for regulating thermal energy through the usage of different fluids with good thermophysical properties. Research efforts have been focused on developing strategies to enhance thermal processes. For
  • dynamics. Over the past few decades, these studies have become even more important due to its applicability in manufacturing industries. The refrigeration of electronic instruments with a fan, cooling of atomic receptacles during an emergency power outage, and solar receivers for storage of thermal energy
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Published 02 Sep 2020

Growth of a self-assembled monolayer decoupled from the substrate: nucleation on-command using buffer layers

  • Robby Reynaerts,
  • Kunal S. Mali and
  • Steven De Feyter

Beilstein J. Nanotechnol. 2020, 11, 1291–1302, doi:10.3762/bjnano.11.113

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  • polymorph A was observed at the bare HOPG–1-phenyloctane interface. For n-C50, the chosen optimal concentration was 0.01 mM, because at this concentration we observed reasonably high-average domain size and relatively low dynamics within the n-C50 monolayer. Figure 4a–c shows a representative large scale
  • not always aligned as is the case in Figure 5a–c. For n-C50, the chosen optimal concentration was 1.0 × 10−4 M, because at this concentration we observed reasonably high average domain size and relatively low dynamics within the n-C50 monolayer. Lowering the concentration of BA-OC14 further (range
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Published 01 Sep 2020

Structure and electrochemical performance of electrospun-ordered porous carbon/graphene composite nanofibers

  • Yi Wang,
  • Yanhua Song,
  • Chengwei Ye and
  • Lan Xu

Beilstein J. Nanotechnol. 2020, 11, 1280–1290, doi:10.3762/bjnano.11.112

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  • that OPCGCNFs can be used as electrodes due to their advantages, such as fast ion dynamics, high electron conductivity and low electron transport impedance. This may be due to the following two factors: (i) The ordered fiber structure of the OPCGCNF electrode allows for the ions to move in an orderly
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Published 27 Aug 2020

Role of redox-active axial ligands of metal porphyrins adsorbed at solid–liquid interfaces in a liquid-STM setup

  • Thomas Habets,
  • Sylvia Speller and
  • Johannes A. A. W. Elemans

Beilstein J. Nanotechnol. 2020, 11, 1264–1271, doi:10.3762/bjnano.11.110

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  • , such dynamics are likely. In the proposed redox reactions, the chloride ligands, which are axially coordinated to the manganese centers, play an essential role in generating the observed currents. First, they dissociate when the manganese center is reduced. We propose that the ions are subsequently
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Published 24 Aug 2020

Influence of the magnetic nanoparticle coating on the magnetic relaxation time

  • Mihaela Osaci and
  • Matteo Cacciola

Beilstein J. Nanotechnol. 2020, 11, 1207–1216, doi:10.3762/bjnano.11.105

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  • Langevin dynamics method was applied based on the effective Verlet-type algorithm. The Néel magnetic relaxation time was obtained via the Coffey method in an oblique magnetic field, adapted to the local magnetic field on a nanoparticle. Keywords: colloidal system; effective Verlet-type algorithm; magnetic
  • relaxation time; nanoparticle coating; numerical simulation; stochastic Langevin dynamics method; superparamagnetic nanoparticles; Introduction One of the most important biomedical applications of colloidal magnetic nanoparticle systems is magnetic hyperthermia applied as an alternative for cancer treatment
  • distribution of the grain size. Each nanoparticle is composed of a magnetic core and a nonmagnetic surface layer of stabilizing surfactant. The system temperature is considered to be constant. To simulate the self-organization of the colloidal magnetic nanoparticles we used the Langevin dynamics stochastic
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Published 12 Aug 2020

Thermophoretic tweezers for single nanoparticle manipulation

  • Jošt Stergar and
  • Natan Osterman

Beilstein J. Nanotechnol. 2020, 11, 1126–1133, doi:10.3762/bjnano.11.97

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  • with sizes of 1 μm and 200 nm in an aqueous medium. We model the effect with an overdamped Langevin dynamics simulation to obtain quantitative predictions. Since the feedback control algorithm can be easily modified, the resulting particle trapping potential can be thus arbitrarily shaped. We show this
  • dynamics simulation of a spherical particle in water. The laser heating was modeled as an instantly imposed Gaussian-shaped temperature field, which changes its center position according to the feedback rule. To keep the model as simple as possible, the heat capacities of the substrate and the liquid, as
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Published 30 Jul 2020

Vibration analysis and pull-in instability behavior in a multiwalled piezoelectric nanosensor with fluid flow conveyance

  • Sayyid H. Hashemi Kachapi

Beilstein J. Nanotechnol. 2020, 11, 1072–1081, doi:10.3762/bjnano.11.92

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  • and the study of vibration behavior are essential. Additionally, it is important that the size-dependent parameters for the dynamics analysis and mathematical modeling of these nanostructures be contained in the theoretical models. For this reason, surface/interface elasticity, which was addressed by
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Published 21 Jul 2020

Microwave photon detection by an Al Josephson junction

  • Leonid S. Revin,
  • Andrey L. Pankratov,
  • Anna V. Gordeeva,
  • Anton A. Yablokov,
  • Igor V. Rakut,
  • Victor O. Zbrozhek and
  • Leonid S. Kuzmin

Beilstein J. Nanotechnol. 2020, 11, 960–965, doi:10.3762/bjnano.11.80

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  • ]. For the lower-frequency range, a new class of single-microwave-photon detectors is needed. With regard to this, a current-biased Josephson junction (JJ) is of particular interest for applications as a threshold detector since its phase dynamics is altered even by a weak probe field. Rich dynamics of
  • washboard potential in the framework of the resistively and capacitively shunted junction (RCSJ) model for the dynamics of the Josephson phase [29][30]. The tilt of the washboard potential is controlled by the bias current I and is defined as EJ(I/IC), where IC is the critical current and EJ = ℏIC/2e. The
  • current distribution [21][31]. For underdamped junctions (α ≪ 1), the width of the switching current distributions monotonically decreases with decreasing temperature. In the case of moderately damped junctions (α > 0.2), the switching dynamics changes due to phase diffusion, i.e., the width of the
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Published 23 Jun 2020

Measurement of electrostatic tip–sample interactions by time-domain Kelvin probe force microscopy

  • Christian Ritz,
  • Tino Wagner and
  • Andreas Stemmer

Beilstein J. Nanotechnol. 2020, 11, 911–921, doi:10.3762/bjnano.11.76

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  • simplicity, this publication focusses on the implementation of the most basic case with three states, where only the quadratic influence on the Kelvin parabola is considered. The model of the measurement system, which is used by the state observer, has to include the dynamics of the detection system. If a
  • spectral density (PSD) of the thermal noise can be calculated as For detection-noise-limited measurements, an additional state has to be introduced to keep track of the dynamics of the apparent noise. The approximation in Equation 17 contains the system output matrix . It depends on the current tip–sample
  • measurement and by recording the frequency-shift signal and the applied bias voltage, the surface potential image can be reconstructed by the state observer. This is a very convenient way of performing KFM measurements by postprocessing. Furthermore, the dynamics of the controller can be studied and tested
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Published 15 Jun 2020

Three-dimensional solvation structure of ethanol on carbonate minerals

  • Hagen Söngen,
  • Ygor Morais Jaques,
  • Peter Spijker,
  • Christoph Marutschke,
  • Stefanie Klassen,
  • Ilka Hermes,
  • Ralf Bechstein,
  • Lidija Zivanovic,
  • John Tracey,
  • Adam S. Foster and
  • Angelika Kühnle

Beilstein J. Nanotechnol. 2020, 11, 891–898, doi:10.3762/bjnano.11.74

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  • molecular dynamics (MD) simulations. Within a single AFM data set we are able to resolve both the first laterally ordered solvation layer of ethanol on the calcite surface as well as the following solvation layers that show no lateral order. Our experimental results are in excellent agreement with MD
  • has been investigated theoretically by using both density functional theory (DFT) [12][13] and molecular dynamics (MD) simulations [14][15][16][17]. It has been found that ethanol molecules strongly bind towards calcite (10.4) terraces – even stronger than water [12][14][16][17]. Ethanol molecules
  • Information File 1, where we also discuss the robustness and reproducibility of the AFM results. Molecular dynamics simulations We employed molecular dynamics simulations to model both calcite and magnesite with their (10.4) surface exposed as a nine layer crystal with three surface unit cells in the
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Published 10 Jun 2020

Simulations of the 2D self-assembly of tripod-shaped building blocks

  • Łukasz Baran,
  • Wojciech Rżysko and
  • Edyta Słyk

Beilstein J. Nanotechnol. 2020, 11, 884–890, doi:10.3762/bjnano.11.73

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  • Lukasz Baran Wojciech Rzysko Edyta Slyk Department for Theoretical Chemistry, Institute of Chemical Sciences, Faculty of Chemistry, Maria Curie-Sklodowska University in Lublin, Poland. 10.3762/bjnano.11.73 Abstract We introduce a molecular dynamics (MD) coarse-grained model for the description of
  • can lead to valuable conclusions, which can be further explored and proved by experimental studies. To date, there are two main approaches that can complement the results obtained in experiments. The first one involves the use of all-atom simulations by molecular dynamics (MD) [27][28][29][30]. Even
  • ” active sites, respectively. In a) we can see that the arms are marked as A, B, and C. e) Parameters of the molecular dynamics model. Part of the configurations for a) NT111 at T* = 0.58, b) NL111 at T* = 0.54, and c) WT111 at T* = 0.58, all with ρ* = 0.2. d) Corresponding Monte Carlo simulation on a
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Published 08 Jun 2020
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