Ferromagnetic resonance spectra of linear magnetosome chains

• Elizaveta M. Gubanova and
• Nikolai A. Usov

Beilstein J. Nanotechnol. 2024, 15, 157–167, doi:10.3762/bjnano.15.15

• correct interpretation of the FMR spectra, it is highly desirable to use the results of detailed micromagnetic modeling, which takes into account the main physical factors affecting the FMR spectra, including the effect of strong magnetic dipole interactions in magnetosome chains. Both magnetosomes grown

• strong magnetic dipole interactions between the particles of the chain, as well as the effect of thermal fluctuations of magnetic moments of nanoparticles at a finite temperature. Using this approach, in this paper the FMR spectra of oriented assemblies of linear chains of quasi-spherical magnetosomes

• the magnetic dipole interactions within the clusters. For example, at η = 0.308, when the average distance between particle centers in a dense random cluster is rather small, L = (π/6η)1/3D ≈ 1.2D, the width of the FMR spectrum of the assembly of random clusters at half maximum is approximately ΔH

The influence of structure and local structural defects on the magnetic properties of cobalt nanofilms

• Alexander Vakhrushev,
• Aleksey Fedotov,
• Olesya Severyukhina and
• Anatolie Sidorenko

Beilstein J. Nanotechnol. 2023, 14, 23–33, doi:10.3762/bjnano.14.3

• -hand side are the Zeeman and exchange interactions, respectively, the next two terms describe magnetic anisotropy, followed by the terms responsible for the Dzialoshinsky–Moriya, magnetoelectric, and dipole interactions, respectively. The consideration of different types of interactions in a model

• magnetic anisotropy are temperature changes, dipole interactions, mechanical deformations, or other external factors. If external influences are absent, then due to spin–orbit interactions of atoms inside the nanomaterial, magnetic crystallographic anisotropy can occur, which is caused by a change in the

A new method for obtaining the magnetic shape anisotropy directly from electron tomography images

• Cristian Radu,
• Ioana D. Vlaicu and
• Andrei C. Kuncser

Beilstein J. Nanotechnol. 2022, 13, 590–598, doi:10.3762/bjnano.13.51

• anisotropy energy, and on the NP organization, through long-range dipole interactions. In other words, magnetic properties are strongly correlated with morphology. There are quite a few ways to provide primary morphological information on NP systems, each of them with specific strengths and weaknesses. A

Revealing local structural properties of an atomically thin MoSe₂ surface using optical microscopy

• Lin Pan,
• Peng Miao,
• Anke Horneber,
• Alfred J. Meixner,
• Pierre-Michel Adam and
• Dai Zhang

Beilstein J. Nanotechnol. 2022, 13, 572–581, doi:10.3762/bjnano.13.49

• CuPc/MoSe2 at 1527, 1449, 1339, 1138, and 746 cm−1 are all enhanced compared to the case of CuPc on SiO2/Si, which indicates that both charge transfer and dipole–dipole interactions can occur. Furthermore, these interactions appear to be more efficient under the excitation with the Ex,y field component

• ]. Additionally, MoSe2 has a polar covalent bond (Mo–Se), which can induce interface dipole–dipole interactions with CuPc in a face-on orientation [24]. The dipole–dipole interaction will bring about a local symmetry-related perturbation, leading to an increase of the matrix element for the LUMO–HOMO transition

• polarization is more pronounced than it is with radial polarization. This is mainly due to the first-layer effect, where ground-state charge transfer and interface dipole–dipole interactions between the first layer of face-on lying CuPc molecules and MoSe2 are more efficient. The SHG and photoluminescence

Topographic signatures and manipulations of Fe atoms, CO molecules and NaCl islands on superconducting Pb(111)

• Carl Drechsel,
• Philipp D’Astolfo,
• Jung-Ching Liu,
• Thilo Glatzel,
• Rémy Pawlak and
• Ernst Meyer

Beilstein J. Nanotechnol. 2022, 13, 1–9, doi:10.3762/bjnano.13.1

• that two tilted CO configurations of ±45° are supposed to coexist on the surface and convert rapidly upon scanning [57]. In their work supported by DFT, Feng et al. [57] further described the formation of CO rows by dipole–dipole interactions that can be repulsive for vertically adsorbed CO molecules

• propensity of diffusing under gentle scanning conditions. In contrast, CO molecules become apparent by STM on Pb(110), since they initiate attractive dipole–dipole interactions, which support the formation of linear aggregates. Furthermore, we show that deposition of NaCl on Pb(111) leads to bilayer islands

Identifying diverse metal oxide nanomaterials with lethal effects on embryonic zebrafish using machine learning

• Richard Liam Marchese Robinson,
• Haralambos Sarimveis,
• Philip Doganis,
• Xiaodong Jia,
• Marianna Kotzabasaki,
• Christiana Gousiadou,
• Stacey Lynn Harper and
• Terry Wilkins

Beilstein J. Nanotechnol. 2021, 12, 1297–1325, doi:10.3762/bjnano.12.97

Progress and innovation of nanostructured sulfur cathodes and metal-free anodes for room-temperature Na–S batteries

• Marina Tabuyo-Martínez,
• Bernd Wicklein and
• Pilar Aranda

Beilstein J. Nanotechnol. 2021, 12, 995–1020, doi:10.3762/bjnano.12.75

• ]. Therefore, the shuttle effect often cannot be avoided. In order to solve this limitation, transition metal nanoparticles (NPs) or compounds are incorporated in the cathode. The metallic species is bonded to the carbon skeleton creating a dipole, which leads to dipole–dipole interactions with the

Bulk chemical composition contrast from attractive forces in AFM force spectroscopy

• Dorothee Silbernagl,
• Media Ghasem Zadeh Khorasani,
• Natalia Cano Murillo,
• Anna Maria Elert and
• Heinz Sturm

Beilstein J. Nanotechnol. 2021, 12, 58–71, doi:10.3762/bjnano.12.5

• interaction of single neutral molecules separated by a distance r, the van der Waals force FvdW includes three different types of dynamic dipole–dipole interactions: Keesom interaction (dipole–dipole), Debye interaction (dipole–induced dipole) and London interaction (transient dipoles). The van der Waals work

The influence of an interfacial hBN layer on the fluorescence of an organic molecule

• Christine Brülke,
• Oliver Bauer and
• Moritz M. Sokolowski

Beilstein J. Nanotechnol. 2020, 11, 1663–1684, doi:10.3762/bjnano.11.149

• by the polar character of the B–N bonds, which induced a dipole in the adsorbed molecule. The resulting interfacial dipole–dipole interactions are thought to have a similar effect on the polarizability of the adsorbed molecule as a CT. Regarding the Raman enhancement effect of a noble metal surface

• at low temperatures of 20 K. We propose the second interpretation to be relevant. Our arguments are the following: Firstly, we have shown in a previous work [32] that the interaction between PTCDA and hBN/Cu(111) is of a physisorptive nature, which makes a strong SERS effect due to dipole–dipole

• interactions at the interface [50] unlikely. Secondly, the strong dependence of the Raman intensity on the sample position (see above) conforms with the interpretation of a SERS effect related to local hot spots. However, the details of the related adsorption sites remains unclear. Since the SERS effect is

Monolayers of MoS₂ on Ag(111) as decoupling layers for organic molecules: resolution of electronic and vibronic states of TCNQ

• Asieh Yousofnejad,
• Gaël Reecht,
• Nils Krane,
• Christian Lotze and
• Katharina J. Franke

Beilstein J. Nanotechnol. 2020, 11, 1062–1071, doi:10.3762/bjnano.11.91

• dipole–dipole interactions between the cyano endgroups and the quinone center of neighboring molecules. This assembly is very similar to typical self-assembled TCNQ islands on weakly interacting substrates [5][23][47][48][49]. When measured at a lower bias voltage (e.g., at V = 0.2 V in Figure 4a), the

• topography of a TCNQ island on MoS2/Ag(111) recorded at V = 0.8 V, I = 200 pA, with superimposed molecular models suggesting intermolecular dipole–dipole interactions (dashed lines). White arrows represent the unit cell of the self-organized TCNQ domain with lattice vectors a1 = 0.9 ± 0.10 nm and a2 = 1.0

Targeted therapeutic effect against the breast cancer cell line MCF-7 with a CuFe₂O₄/silica/cisplatin nanocomposite formulation

• B. Rabindran Jermy,
• Vijaya Ravinayagam,
• Widyan A. Alamoudi,
• Dana Almohazey,
• Hatim Dafalla,
• Lina Hussain Allehaibi,
• Abdulhadi Baykal,
• Muhammet S. Toprak and
• Thirunavukkarasu Somanathan

Beilstein J. Nanotechnol. 2019, 10, 2217–2228, doi:10.3762/bjnano.10.214

• preparation of a copper nanoferrite using a citrate sol–gel technique [6]. In addition, several metal-based ferrite systems have been recently reported for bioscience applications [7]. Although spinel ferrite nanoparticles are interesting, due to the strong magnetic dipole–dipole interactions, they tend to

Nitrogen-vacancy centers in diamond for nanoscale magnetic resonance imaging applications

• Alberto Boretti,
• Lorenzo Rosa,
• Jonathan Blackledge and
• Stefania Castelletto

Beilstein J. Nanotechnol. 2019, 10, 2128–2151, doi:10.3762/bjnano.10.207

The effect of magneto-crystalline anisotropy on the properties of hard and soft magnetic ferrite nanoparticles

• Hajar Jalili,
• Bagher Aslibeiki,
• Ali Ghotbi Varzaneh and
• Volodymyr A. Chernenko

Beilstein J. Nanotechnol. 2019, 10, 1348–1359, doi:10.3762/bjnano.10.133

• ) in the δm curve indicates the dominance of dipole–dipole interactions, while a positive peak (a positive deviation of the Henkel plot) can be attributed to the dominance of exchange interactions. This is because the dipole–dipole interactions tend to hinder the magnetization (i.e., they have the

• ) defined as [46][47]: where HDCD and HIRM correspond to the peak position of the χirr (DCD) and the χirr (IRM) curve, respectively (see Figure 11). In our case, the obtained negative values for Hint (Table 3) confirmed the presence of dipole–dipole interactions in all samples. The corresponding δm curves

• plots from linearity as well as the negative δm curves indicate a predominance of dipole–dipole interactions in all samples. It was observed that Co doping strongly reduces the specific absorption rate values (to about a fourth) in the samples, despite increasing the magnetic anisotropy, saturation

Co-doped MnFe₂O₄ nanoparticles: magnetic anisotropy and interparticle interactions

• Bagher Aslibeiki,
• Parviz Kameli,
• Hadi Salamati,
• Giorgio Concas,
• Maria Salvador Fernandez,
• Alessandro Talone,
• Giuseppe Muscas and
• Davide Peddis

Beilstein J. Nanotechnol. 2019, 10, 856–865, doi:10.3762/bjnano.10.86

• other hand, negative ΔM values are usually observed in the case of the prevalence of demagnetizing (e.g., dipole–dipole) interactions; positive values are attributed to interactions promoting the magnetized state (e.g., direct exchange interactions). As suggested by the thermal independent behavior of

• the FC curves at low temperature, all samples exhibit a marked interaction regime, with negative deviations connected to prevalent dipole-dipole interactions (Figure 6a). This is expected for bare particles in close contact but without any major coalescence [52]. The larger intensity of the

Heating ability of magnetic nanoparticles with cubic and combined anisotropy

• Nikolai A. Usov,
• Mikhail S. Nesmeyanov,
• Elizaveta M. Gubanova and
• Natalia B. Epshtein

Beilstein J. Nanotechnol. 2019, 10, 305–314, doi:10.3762/bjnano.10.29

• magneto–dipole interactions and the effect of thermal fluctuations. For an assembly of superparamagnetic nanoparticles with uniaxial anisotropy, it has been recently shown [22] that the existence of nonmagnetic shells of appreciable thickness at the nanoparticle surface considerably reduces the intensity

Induced smectic phase in binary mixtures of twist-bend nematogens

• Anamarija Knežević,
• Irena Dokli,
• Marin Sapunar,
• Suzana Šegota,
• Ute Baumeister and
• Andreja Lesac

Beilstein J. Nanotechnol. 2018, 9, 1297–1307, doi:10.3762/bjnano.9.122

• interactions, dipole-induced dipole interactions, and excluded volume effects [14][15]. In this study, we report on the unusual behaviour of a binary mixture between two twist-bend nematogens. Previously we reported on the mesomorphic behaviour of various imino-linked dimers that displayed both uniaxial

• ) with 4-cyano-4’-pentylbiphenyl (5CB) [13]. It has been associated with the formation of charge transfer (CT) complexes between strong donor and acceptor compounds. However, the induction of a smectic phase may also be the result of weak CT interactions, together with other effects such as dipole–dipole

Anchoring Fe₃O₄ nanoparticles in a reduced graphene oxide aerogel matrix via polydopamine coating

• Błażej Scheibe,
• Radosław Mrówczyński,
• Natalia Michalak,
• Karol Załęski,
• Michał Matczak,
• Mateusz Kempiński,
• Zuzanna Pietralik,
• Mikołaj Lewandowski,
• Stefan Jurga and
• Feliks Stobiecki

Beilstein J. Nanotechnol. 2018, 9, 591–601, doi:10.3762/bjnano.9.55

• @Fe3O4 aerogel led to the increase of TB to 252 K. This could be caused by several biased effects: (i) an increase of the sample density, (ii) a decrease of the distance between magnetite nanoparticles and (iii) an increase of dipole–dipole interactions between them [68]. Conclusion The influence of

Ferrocholesteric–ferronematic transitions induced by shear flow and magnetic field

• Dmitriy V. Makarov,
• Alexander A. Novikov and
• Alexander N. Zakhlevnykh

Beilstein J. Nanotechnol. 2017, 8, 2552–2561, doi:10.3762/bjnano.8.255

• ferrocholesteric. Because of the small volume fraction () of ferroparticles in the suspension, magnetic dipole–dipole interactions are neglected. The equation of the director motion has the form [13][27] where γ1 = α3 − α2 and γ2 = α3 + α2 are the coefficients of the rotational viscosity of a liquid crystal. The

Non-intuitive clustering of 9,10-phenanthrenequinone on Au(111)

• Ryan D. Brown,
• Rebecca C. Quardokus,
• Natalie A. Wasio,
• Jacob P. Petersen,
• Angela M. Silski,
• Steven A. Corcelli and
• S. Alex Kandel

Beilstein J. Nanotechnol. 2017, 8, 1801–1807, doi:10.3762/bjnano.8.181

• in dipole–dipole interactions being overwhelmed by stronger intermolecular interactions (i.e., van der Waals forces and hydrogen bonding) during growth processes [32][33][34][35]. However, the arrangement of molecules in the tetramer does not allow for half of the carbonyl groups present to form C–H

Intercalation and structural aspects of macroRAFT agents into MgAl layered double hydroxides

• Dessislava Kostadinova,
• Ana Cenacchi Pereira,
• Muriel Lansalot,
• Franck D’Agosto,
• Elodie Bourgeat-Lami,
• Fabrice Leroux,
• Christine Taviot-Guého,
• Sylvian Cadars and
• Vanessa Prevot

Beilstein J. Nanotechnol. 2016, 7, 2000–2012, doi:10.3762/bjnano.7.191

• caused by dipole–dipole interactions that are too strong to be properly averaged by MAS. However, this is circumvented in the 2D HETCOR spectra by the application of homonuclear 1H decoupling during the 1H evolution period (see details in Experimental). For the same reason, the 2D peak positions in the

Bacteriorhodopsin–ZnO hybrid as a potential sensing element for low-temperature detection of ethanol vapour

• Saurav Kumar,
• Sudeshna Bagchi,
• Senthil Prasad,
• Anupma Sharma,
• Ritesh Kumar,
• Rishemjit Kaur,
• Jagvir Singh and
• Amol P. Bhondekar

Beilstein J. Nanotechnol. 2016, 7, 501–510, doi:10.3762/bjnano.7.44

• approximately 2.90 meV for the ZnO-NR and 2.10 meV for the ZnO-TF hybrid structure (measured from the work function equation), thus contributing to the overall increase in resistance [76]. One of the possible explanations can be the dipole–dipole interactions between the extracellular site of the protein and

Magnetic properties of iron cluster/chromium matrix nanocomposites

• Arne Fischer,
• Robert Kruk,
• Di Wang and
• Horst Hahn

Beilstein J. Nanotechnol. 2015, 6, 1158–1163, doi:10.3762/bjnano.6.117

• deposited in the AFM Cr matrix unambiguously points out the decisive role of FM/AFM exchange coupling in the enhancement of the magnetic anisotropy. For lower DNN the effect of the particle size on TB gets even less pronounced, since magnetic inter-particle interactions (e.g., strong dipole–dipole

• interactions) become dominant. Hysteresis loops were recorded at 5 K after field cooling from 350 K, which is above the TN of Cr (311 K [16]), in an external magnetic field of μ0H = 4.5 T. A linear diamagnetic background originating from the Si substrate as well as the Au layers was subtracted. The coercivity

Entropy effects in the collective dynamic behavior of alkyl monolayers tethered to Si(111)

• Christian Godet

Beilstein J. Nanotechnol. 2015, 6, 583–594, doi:10.3762/bjnano.6.60

• response. Here, a mixed alkyl/acid-functionalized monolayer with 5% acid molar fraction (in the liquid phase) was chosen to avoid acid–acid dipole interactions at the OML surface (Figure 1). Using low-doped n-type Si (1–10 Ω·cm) provides strong rectification [27][32][38][39][40] with a very low dc current

Synthesis, characterization, monolayer assembly and 2D lanthanide coordination of a linear terphenyl-di(propiolonitrile) linker on Ag(111)

• Zhi Chen,
• Svetlana Klyatskaya,
• José I. Urgel,
• David Écija,
• Olaf Fuhr,
• Willi Auwärter,
• Johannes V. Barth and
• Mario Ruben

Beilstein J. Nanotechnol. 2015, 6, 327–335, doi:10.3762/bjnano.6.31

• and Supporting Information File 1, Figure S3) in an antiparallel organisation of the end standing CN groups by dipole–dipole interactions. Formation of the self-assembled monolayer of 2 on Ag(111) In recent years, systematic studies of the self-assembly behavior of the series of polyphenylene

A sonochemical approach to the direct surface functionalization of superparamagnetic iron oxide nanoparticles with (3-aminopropyl)triethoxysilane

• Bashiru Kayode Sodipo and
• Azlan Abdul Aziz

Beilstein J. Nanotechnol. 2014, 5, 1472–1476, doi:10.3762/bjnano.5.160

• ; superparamagnetic iron oxide nanoparticles (SPION); Findings Superparamagnetic iron oxide nanoparticles (SPION) have a wide range of applications in biomedical research and development. The main drawbacks of SPION are a high surface energy, van der Waals forces of attraction and dipole to dipole interactions that