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Search for 青少年白发病基因IRF4_、Bcl-2 卫健委健康委 小荷医典 in Full Text gives 2565 result(s) in Beilstein Journal of Nanotechnology. Showing first 200.

Classification and application of metal-based nanoantioxidants in medicine and healthcare

  • Nguyen Nhat Nam,
  • Nguyen Khoi Song Tran,
  • Tan Tai Nguyen,
  • Nguyen Ngoc Trai,
  • Nguyen Phuong Thuy,
  • Hoang Dang Khoa Do,
  • Nhu Hoa Thi Tran and
  • Kieu The Loan Trinh

Beilstein J. Nanotechnol. 2024, 15, 396–415, doi:10.3762/bjnano.15.36

Graphical Abstract
  • , and cancers [1][2]. The human body naturally defends itself against oxidative stress by using antioxidant biomolecules. With the excellent ROS scavenging effect, antioxidants significantly contribute to the balance of ROS and protect the human body from free radicals, which are produced either by
  • ]. Figure 2 shows the property of ceria nanoplates with multi-antioxidant activities and the relationship between lattice thickness, Ce3+ concentration, and the resulting strain in ceria with specific surface orientation (100) [32]. Similarly, a large number of different metal-based nanomaterials have been
  • -line ferrihydrite, 2-line ferrihydrite, goethite, akageneite, feroxyhyte, hematite, magnetite, maghemite, schwertmannite, and lepidocrocite were compared regarding CAT activity [34]. The highest CAT activity was shown by 2-line ferrihydrite, followed by 6-line ferrihydrite and feroxyhyte. Iron-based
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Published 12 Apr 2024

Insect attachment on waxy plant surfaces: the effect of pad contamination by different waxes

  • Elena V. Gorb and
  • Stanislav N. Gorb

Beilstein J. Nanotechnol. 2024, 15, 385–395, doi:10.3762/bjnano.15.35

Graphical Abstract
  • tarsal attachment devices) are able to establish a highly reliable contact and adhere successfully to a great variety of substrates having both smooth and microrough topographies [1][2][3]. However, in cases of waxy plant surfaces, where the plant cuticle is covered by micro/nanoscopic three-dimensional
  • (number per unit area) influence insect attachment [11][12]. As an explanation for reduced insect adhesion on waxy plant surfaces, several contributing mechanisms have been previously suggested, such as (1) specific micro/nanoroughness created by wax projections (roughness hypothesis), (2) contamination
  • projections depending on the plant species (Figure 1). Both ribbon-shaped polygonal rodlets in A. negundo (Figure 1a) and apical filamentous branches of tubules in B. oleracea (Figure 1d), although differing greatly in size (length ca. 20 μm in A. negundo according to [7][34] and 2 μm in B. oleracea according
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Published 11 Apr 2024

On the mechanism of piezoresistance in nanocrystalline graphite

  • Sandeep Kumar,
  • Simone Dehm and
  • Ralph Krupke

Beilstein J. Nanotechnol. 2024, 15, 376–384, doi:10.3762/bjnano.15.34

Graphical Abstract
  • sensors are an important factor in moving from rigid to flexible electronics. Graphene, because of its interesting inherent properties, has found its way in many applications [1][2][3]. In particular, it is a promising alternative material as a transparent and conductive coating for future flexible
  • -induced changes in the contacts, the NCG was patterned such that the NCG itself is used as a contacting electrode (shown in Figure 1b). The area marked with a red square in Figure 1b (2 mm × 2 mm) is the active device area for sheet resistance measurements on a substrate of 10 mm × 10 mm area. Thin NCG
  • tensile strain up to 2%, which is an order of magnitude larger than in our previous work (max 0.1%) [19]. We could reproduce the previously observed gauge factor (GF) of ca. 24 at very low strain where the sheet resistance increases linearly with strain (<0.3%); however, in the extended-strain region we
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Published 08 Apr 2024

Investigating ripple pattern formation and damage profiles in Si and Ge induced by 100 keV Ar+ ion beam: a comparative study

  • Indra Sulania,
  • Harpreet Sondhi,
  • Tanuj Kumar,
  • Sunil Ojha,
  • G R Umapathy,
  • Ambuj Mishra,
  • Ambuj Tripathi,
  • Richa Krishna,
  • Devesh Kumar Avasthi and
  • Yogendra Kumar Mishra

Beilstein J. Nanotechnol. 2024, 15, 367–375, doi:10.3762/bjnano.15.33

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  • Denmark, Alison 2 6400, Denmark Amity Institute of Nanotechnolgy, Amity University, Noida 201303, India Katholieke University, Faculty of Engineering Science, Leuven 3000, Belgium Department of Nanoscience and Materials, Central University of Jammu, Jammu 181143, India Centre for Interdisciplinary
  • in a controlled manner on a wide variety of substrates with required dimensions. There are reports from 1960’s, by Cunningham et al. [1] and Navez et al. [2], on the production of submicron and nanoscale patterns by IBS. However, with the availability of high-resolution tools such as atomic force
  • ions (He+ ≈1–2 MeV). It impinges on the target material which provides good mass and depth resolution and also probes smaller radiation damages [35]. The damage produced by ion implantation in semiconductors consists of randomly distributed atoms displaced from their regular lattice sites up to a depth
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Published 05 Apr 2024

Modulated critical currents of spin-transfer torque-induced resistance changes in NiCu/Cu multilayered nanowires

  • Mengqi Fu,
  • Roman Hartmann,
  • Julian Braun,
  • Sergej Andreev,
  • Torsten Pietsch and
  • Elke Scheer

Beilstein J. Nanotechnol. 2024, 15, 360–366, doi:10.3762/bjnano.15.32

Graphical Abstract
  • been utilized as an effective tool in fundamental studies [1][2] as well as advanced technologies [2][3][4][5][6] to quickly change the magnetization in nanoscopic magnetic systems [2][5][7]. Among manifold material synthesis strategies, high-aspect-ratio multilayered nanowire arrays based on anodic
  • (Figure 1c), which is the easy axis according to the disk-like shape of the NiCu layers and the vibrating sample magnetometer (VSM) measurements (see Supporting Information File 1). In all measurements, the magnetic field amplitude was first set to a large initial value (usually 2 T or −2 T, depending on
  • layer, and layers 2 and 3 are the free layers. The Cu spacer between layers 1 and 2 is labelled as spacer 1 and that between layers 2 and 3 as spacer 2. When µ0H is around or slightly above 0 T, as shown in the MR curve (yellow line) in Figure 2b, dV/dI has a relatively high value, which represents an
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Published 03 Apr 2024

Controllable physicochemical properties of WOx thin films grown under glancing angle

  • Rupam Mandal,
  • Aparajita Mandal,
  • Alapan Dutta,
  • Rengasamy Sivakumar,
  • Sanjeev Kumar Srivastava and
  • Tapobrata Som

Beilstein J. Nanotechnol. 2024, 15, 350–359, doi:10.3762/bjnano.15.31

Graphical Abstract
  • fascinating optical and electrical properties [1]. WOx is a wide-bandgap oxide semiconductor with a large excitonic binding energy of 0.15 eV and a high optical absorption coefficient (≥104 cm−1 in the UV region) [2]. These, in conjunction with decent carrier mobility (12 cm2·V−1·s−1), make this material an
  • , bandgap, and electrical conductivity, to a large extent by controlling the cationic oxidation state and the film stoichiometry [2]. As a matter of fact, adjustments in the film stoichiometry and microstructure are experimentally viable by the choice of a suitable growth technique [9][10][11]. As a result
  • . In this regard, radio frequency (rf) sputter deposition is one of the preferred choices as an industry-compatible method to grow WOx thin films [2][19][20][21]. Apart from thin films, nanostructured metal oxides generally possess superior electrochemical properties compared to their bulk counterparts
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Published 02 Apr 2024

Nanomedicines against Chagas disease: a critical review

  • Maria Jose Morilla,
  • Kajal Ghosal and
  • Eder Lilia Romero

Beilstein J. Nanotechnol. 2024, 15, 333–349, doi:10.3762/bjnano.15.30

Graphical Abstract
  • drugs with low molecular weight [1][2]. Different 2-nitroimidazole-based nanomedicines against Chagas disease (CD) to reduce the toxicity and increase the effectiveness of benznidazole (BNZ) treatment have been preclinically screened in the last two decades (see the recently reviewed BNZ-based
  • are calculated to have CD, with up to 45,000 having cardiomyopathies [11]. The infection is treated with benznidazole, first manufactured by Roche (Roche 7-501, Rochagan, N-benzyl-2-(2-nitro-1H-imidazol-1-yl)acetamide). BNZ is currently available in the United States after being approved by the US
  • released BNZ available for absorption [39][40]. Other studies determined the release profile of BNZ in different media [41][42][43][44] and its permeability across Caco-2 cells [43][44]. Between 2012 and 2018 the BERENICE (BEnznidazol and triazol REsearch group for Nanomedicine and Innovation on Chagas
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Published 27 Mar 2024

Comparative electron microscopy particle sizing of TiO2 pigments: sample preparation and measurement

  • Ralf Theissmann,
  • Christopher Drury,
  • Markus Rohe,
  • Thomas Koch,
  • Jochen Winkler and
  • Petr Pikal

Beilstein J. Nanotechnol. 2024, 15, 317–332, doi:10.3762/bjnano.15.29

Graphical Abstract
  • ; particle sizing; primary particles; Introduction Following the EU definition of nanomaterials as being materials in which more than 50% by number of their primary particles have at least one dimension smaller than 100 nm [1][2], the accurate measurement of particle size distributions (PSDs) has become
  • developed over many years and are regularly used in each participating company for quality control and research purposes. The evaluated MinFeret and ECD values, with the exception of M3 for sample D, fall within the 95% confidence interval (Table 2). The observed standard deviation of the fraction of
  • log-normal assumption. The probability p that the particle size distribution is not log-normal is given in Table 2 together with the results of the fits. Indirect particle size measurements and optical properties Single-particle inductively coupled plasma mass spectrometry (spICP-MS) measurements are
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Published 25 Mar 2024

Investigating structural and electronic properties of neutral zinc clusters: a G0W0 and G0W0Г0(1) benchmark

  • Sunila Bakhsh,
  • Muhammad Khalid,
  • Sameen Aslam,
  • Muhammad Sohail,
  • Muhammad Aamir Iqbal,
  • Mujtaba Ikram and
  • Kareem Morsy

Beilstein J. Nanotechnol. 2024, 15, 310–316, doi:10.3762/bjnano.15.28

Graphical Abstract
  • /bjnano.15.28 Abstract The structural and electronic properties of zinc clusters (Znn) for a size range of n = 2–15 are studied using density functional theory. The particle swarm optimization algorithm is employed to search the structure and to determine the ground-state structure of the neutral Zn
  • ionization potential compared to other methods. Keywords: binding energies; CALYPSO structure prediction; DFT; G0W0 studies; zinc clusters; zinc isomers; Introduction Zinc is a group-IIB element that is frequently used as a galvanizing material and in storage media as an anode [1][2][3]. However, its
  • have been carefully analyzed with the VESTA software, and low-energy isomers were refined from more than 600 structures (ca. 22 generations in CALYPSO). The geometric optimization of all clusters for a size range of n = 2–15 was performed in two steps: (i) structure search and initial geometric
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Published 15 Mar 2024
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  • studies have demonstrated that metal oxide nanoparticles (MeOx NPs) are toxic and tend to have adverse effects on living organisms and the environment [2][3][4][5][6]. The toxicity of NPs depends on various structural (intrinsic) [7] and extrinsic properties. Depending on the dispersing environment
  • to four doses (50, 100, 150, and 200 μg/mL) and exposure times ranging from 1 to 7 h, which results in 132 MeOx NPs data points. The detailed dataset is provided in Supporting Information File 2, Section S1. Descriptor calculation Selecting the appropriate descriptors is crucial for property and
  • from the DTC lab software tools (http://teqip.jdvu.ac.in/QSAR_Tools/). To further validate model 2 for the similarity-based prediction, we have performed chemical read-across analysis. Prediction reliability indicator (PRI) tool Ensuring the reliability of predictions for a new set of data is a vital
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Published 12 Mar 2024

Determining by Raman spectroscopy the average thickness and N-layer-specific surface coverages of MoS2 thin films with domains much smaller than the laser spot size

  • Felipe Wasem Klein,
  • Jean-Roch Huntzinger,
  • Vincent Astié,
  • Damien Voiry,
  • Romain Parret,
  • Houssine Makhlouf,
  • Sandrine Juillaguet,
  • Jean-Manuel Decams,
  • Sylvie Contreras,
  • Périne Landois,
  • Ahmed-Azmi Zahab,
  • Jean-Louis Sauvajol and
  • Matthieu Paillet

Beilstein J. Nanotechnol. 2024, 15, 279–296, doi:10.3762/bjnano.15.26

Graphical Abstract
  • ; Introduction The advent of two-dimensional (2D) layered materials beyond graphene has initiated a new field of research [1][2][3]. In the family of 2D layered structures, transition metal dichalcogenides (TMDs) have attracted considerable attention from academia and regarding potential applications [4][5][6][7
  • evaluation of the temperature of MoS2 flakes prepared in different ways and that of the Si substrate as functions of the laser power impinging on the sample through a 100× objective (N.A. 0.9). The power was cycled between ≈5 μW and ≈2 mW. The temperature of MoS2 flakes is evaluated from the Stokes/anti
  • . Moreover, a significant dependence of the MoS2 Raman intensity on the SiO2 thickness occurs for N > 2, pointing out the importance to determine precisely this latter parameter. Another criterion to derive the thickness of MoS2 flakes is the A2D(Si)/A0(Si) intensity ratio [31]. For the evaluation of this
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Published 07 Mar 2024

Ultrasensitive and ultrastretchable metal crack strain sensor based on helical polydimethylsiloxane

  • Shangbi Chen,
  • Dewen Liu,
  • Weiwei Chen,
  • Huajiang Chen,
  • Jiawei Li and
  • Jinfang Wang

Beilstein J. Nanotechnol. 2024, 15, 270–278, doi:10.3762/bjnano.15.25

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  • ; ultrahigh stretchability; Introduction In recent years, there has been significant advancement in the field of stretchable and soft electronic devices due to the increasing demand for their applications in various domains [1][2]. These applications include the detection of human motion [3][4][5
  • permeability of vacuum (4π × 10−7 N·A−2), and k is the aspect ratio correction factor, which relies on the ratio between coil diameter D and length L0, as shown in Figure 3a. Figure 3b depicts the alteration in inductance as a function of the strain. The helical index of this sensor is 1, while its length is 2
  • applied strain with helix indices of 1, 2, and 3. Insets: relative resistance change as a function of the applied strain in the flat gold film. (b) The linearity between the relative resistance changes and strain. (c) Change in resistance for a step strain from 0 to 200%. (d) Response time of the strain
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Published 01 Mar 2024

Vinorelbine-loaded multifunctional magnetic nanoparticles as anticancer drug delivery systems: synthesis, characterization, and in vitro release study

  • Zeynep Özcan and
  • Afife Binnaz Hazar Yoruç

Beilstein J. Nanotechnol. 2024, 15, 256–269, doi:10.3762/bjnano.15.24

Graphical Abstract
  • uncontrolled proliferation of aberrant cells, which can spread to diverse body regions, encompassing over a hundred distinct forms [1][2]. Current cancer treatments lack a complete approach, as they mostly rely on radiotherapy, chemotherapy, immunotherapy, and surgery in clinical environments [3]. While these
  • amounts: 100, 200, and 400 mg; dopamine hydrochloride/Fe3O4 ratios: 1:1, 2:1, and 4:1) and stirred at room temperature for 15 h at 1000 rpm. Following this stage, the obtained PDA-coated Fe3O4 NPs were separated from the solution using a magnet. Subsequently, unreacted material was removed by washing
  • cycles [41]. Determination of vinorelbine drug release VNB/PDA/Fe3O4 NPs (at ratios of 1:1, 2:1, and 4:1) were placed into dialysis capsules at a concentration of 1 mg/mL. Subsequently, each prepared dialysis capsule was placed in 100 mL phosphate solution at pH 5.5 and 7.4 [30]. The experiment was
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Published 28 Feb 2024

Design, fabrication, and characterization of kinetic-inductive force sensors for scanning probe applications

  • August K. Roos,
  • Ermes Scarano,
  • Elisabet K. Arvidsson,
  • Erik Holmgren and
  • David B. Haviland

Beilstein J. Nanotechnol. 2024, 15, 242–255, doi:10.3762/bjnano.15.23

Graphical Abstract
  • ; kinetic inductance; optomechanics; superconductivity; Introduction Cavity optomechanics [1] deals with the detection and manipulation of massive “test objects” at the fundamental limits imposed by quantum physics [2]. By detecting the motion of the test object, we can sense an external force, for example
  • fabricating a wafer of sensor chips. We design the cantilever’s plane-view dimensions to achieve ωm/2π in the range of 0.5–10 MHz, corresponding to mechanical spring constant values k in the range of 2–160 N/m for typical device parameters. The wide frequency range allows us to fabricate devices working in
  • . Photolithography defines the chip and cantilever. We spin a 1.7 μm thick photoresist maP1225, bake at 105 °C for 2 min. We then expose with a dose of 300 mJ/cm2 in the MLA150, and develop in maD331 for 45 s. We etch through the Si-N layer using a CHF3/SF6 process with an etch rate of roughly 100 nm/min in the
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Published 15 Feb 2024

Quantitative wear evaluation of tips based on sharp structures

  • Ke Xu and
  • Houwen Leng

Beilstein J. Nanotechnol. 2024, 15, 230–241, doi:10.3762/bjnano.15.22

Graphical Abstract
  • nanotechnology [1][2][3][4][5]. Compared to optical and electron microscopy, AFM enables three-dimensional (3D) measurements of nanostructures in air and liquid environments [6]. The interaction between the tip and sample influences the measurement results of AFM by convoluting the tip topography with the sample
  • the reconstructed nanoparticle. Zhang et al. [16] developed a 2 µm lattice sample with uniformity and consistency to reconstruct the AFM tip, thus mitigating the impact of tip effects on measurement results. Onishi et al. [17] proposed a technique to extract the probe shape function from AFM
  • topography accurately. In contrast to the blind reconstruction algorithm, when using sharp structures to characterize the tip topography, the tip morphology is mainly reflected in the sharp feature structures on the sample. Figure 2 illustrates the modeling process. To enhance accuracy and efficiency of
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Published 14 Feb 2024

Multiscale modelling of biomolecular corona formation on metallic surfaces

  • Parinaz Mosaddeghi Amini,
  • Ian Rouse,
  • Julia Subbotina and
  • Vladimir Lobaskin

Beilstein J. Nanotechnol. 2024, 15, 215–229, doi:10.3762/bjnano.15.21

Graphical Abstract
  • corona; Introduction The interface between biological systems and engineered materials has gained significant attention in recent years because of its wide range of applications, spanning from food to medicine and environmental science [1][2]. This interface plays a crucial role in ensuring the safety
  • of the NP, which is influenced by its physicochemical composition, (ii) the interface between the solid NP and the surrounding liquid environment, where notable changes occur upon interaction, and (iii) the contact zone between the solid–liquid interface and biological substrates (Figure 2) [22]. In
  • surfaces derived from explicit all-atom molecular dynamics simulations utilizing a previously established scheme [2][24][28]. These PMFs provide the input required to determine the adsorption energies between milk proteins and aluminum surfaces by using multiscale UA CG model, spanning from the atomistic
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Published 13 Feb 2024

Ion beam processing of DNA origami nanostructures

  • Leo Sala,
  • Agnes Zerolová,
  • Violaine Vizcaino,
  • Alain Mery,
  • Alicja Domaracka,
  • Hermann Rothard,
  • Philippe Boduch,
  • Dominik Pinkas and
  • Jaroslav Kocišek

Beilstein J. Nanotechnol. 2024, 15, 207–214, doi:10.3762/bjnano.15.20

Graphical Abstract
  • DNA origami nanostructures is rarely explored, yet promising applications are foreseen to require such information. DNA nanostructures have been explored as drug delivery vessels for chemotherapeutics [1][2]. With the constant pursuit of effective targeting strategies [3], they could eventually be
  • for about 2 h. Afterwards, 100 μL of the synthesis mixture was filtered through 100 kDa MWCO Amicon centrifugal filter units to remove excess staple strands. This was done three times, each time adding 400 μL of FOB, at a relative centrifugal force of 4000g for 4 min. The filters were then flipped and
  • irradiation of samples, a Faraday cup is inserted and the ratio between the Faraday cup and slit currents is determined and allows for calculating the reached projectile fluence. Fluxes were kept at or below 2 × 109 ions·cm−2·s−1 to prevent macroscopic sample heating. Projectile fluences ranged from 1012 to
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Published 12 Feb 2024

Exploring disorder correlations in superconducting systems: spectroscopic insights and matrix element effects

  • Vyacheslav D. Neverov,
  • Alexander E. Lukyanov,
  • Andrey V. Krasavin,
  • Alexei Vagov,
  • Boris G. Lvov and
  • Mihail D. Croitoru

Beilstein J. Nanotechnol. 2024, 15, 199–206, doi:10.3762/bjnano.15.19

Graphical Abstract
  • for manipulating the properties of superconducting materials [1][2][3][4]. Interest in the interplay between superconductivity and disorder has recently increased greatly due to new findings both in theory and in experiment [5][6][7][8][9][10][11][12][13]. Previous investigations primarily centered on
  • take N = 50, which our calculations show is sufficiently large to mitigate finite-size effects. BdG equations (Equation 2) are solved together with the self-consistency conditions (Equation 3) in the usual way until the order parameter and the Hartree potential reach a predefined accuracy threshold [63
  • potential), α = 1 (modest correlation with a finite correlation length), and α = 2 (strong correlation with the correlation length reaching the sample size). The solutions to the Bogoliubov–de Gennes (BdG) equations, encompassing an examination of their statistical attributes, spatial characteristics of the
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Published 12 Feb 2024

Graphene removal by water-assisted focused electron-beam-induced etching – unveiling the dose and dwell time impact on the etch profile and topographical changes in SiO2 substrates

  • Aleksandra Szkudlarek,
  • Jan M. Michalik,
  • Inés Serrano-Esparza,
  • Zdeněk Nováček,
  • Veronika Novotná,
  • Piotr Ozga,
  • Czesław Kapusta and
  • José María De Teresa

Beilstein J. Nanotechnol. 2024, 15, 190–198, doi:10.3762/bjnano.15.18

Graphical Abstract
  • unconventional strong electron–electron interactions, present in superlattices formed in twisted bilayered and trilayered graphene, led to the emergence of a new field called “twistronics” – just to highlight recent remarkable discoveries such as superconductivity [2][3], topological phases [4][5], and the
  • processing times. Three sets of lines with a length of 2 μm are etched in graphene, as can be seen in Figure 2B. Each horizontal set of lines corresponds to distinct dwell times (from 1 to 100 µs). Within each group, the dose decreases from left to right. The details of the exposure parameters, with an
  • electrons at a given process time. From the pressure P inside the SEM chamber one can calculate the number of impinging molecules by using the formula J = PNA/(2πMRT)1/2, given in the reference [31], where NA is the Avogadro number, M is the molar mass of impinging molecules, R is the universal gas constant
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Published 07 Feb 2024

Nanocarrier systems loaded with IR780, iron oxide nanoparticles and chlorambucil for cancer theragnostics

  • Phuong-Thao Dang-Luong,
  • Hong-Phuc Nguyen,
  • Loc Le-Tuan,
  • Xuan-Thang Cao,
  • Vy Tran-Anh and
  • Hieu Vu Quang

Beilstein J. Nanotechnol. 2024, 15, 180–189, doi:10.3762/bjnano.15.17

Graphical Abstract
  • ]. Particularly, PLGA is widely used for nanoparticle formulation because it is a versatile material that can serve multiple functions, including transporting of therapeutic drugs and imaging agents [2][3]. In addition, PLGA can be altered in numerous ways to increase the half-life of nanoparticles in the blood
  • their high potential applications in various fields, including theragnostics. The PLGA SPION nanoparticles were modified to carry siRNA for silencing the inflammatory cytokine Cox-2 in activated macrophages and to serve as a tracer for locating activated macrophages in a mouse model of intra-uterine
  • -127 (P2443), poly(vinyl alcohol) (PVA) (P8136), phosphate buffered saline (PBS) (P4417), dimethyl sulfoxide (DMSO) (472301), dichloromethane (DCM), 3-[4,5-dimethylthiazol-2-yl]-2,5 diphenyl-2H-tetrazolium bromide (MTT) (M2128), and coumarin-6 (442631), K3[Fe(CN)6] (1049730100) were purchased from
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Published 06 Feb 2024

Modification of graphene oxide and its effect on properties of natural rubber/graphene oxide nanocomposites

  • Nghiem Thi Thuong,
  • Le Dinh Quang,
  • Vu Quoc Cuong,
  • Cao Hong Ha,
  • Nguyen Ba Lam and
  • Seiichi Kawahara

Beilstein J. Nanotechnol. 2024, 15, 168–179, doi:10.3762/bjnano.15.16

Graphical Abstract
  • desire to enhance the green strength of NR to achieve the comparable mechanical properties of vulcanized natural rubber (VNR) [1][2][3]. VNR is commonly utilized for NR commercial products. However, due to its crosslinked structure, VNR products cannot be recycled or degraded after diposal [4][5
  • g of NaNO3 and 3 g of KMnO4 were added to the mixture. The temperature was maintained between 0–5 °C, and the system was kept for 2 h before heating up to 35 °C and kept for 1 h. After that, water was added to increase the temperature to 90 °C for 30 min, and 10 mL of H2O2 was dropped into the flask
  • by the addition of concentrated HCl (1 mL) or NH4OH (1.5 mL) as catalysts. When using HCl, the mixture was stirred for 2 h under a temperature of 75 °C. Conversely, when NH4OH was used, the mixture was stirred at 40 °C for 4 h. The solid mixture, obtained after centrifugation, was rinsed and filtered
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Published 05 Feb 2024

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

Graphical Abstract
  • nanoparticles; numerical simulation; Introduction Magnetotactic bacteria are living organisms that grow within themselves magnetite nanoparticles called magnetosomes [1][2][3][4]. In contrast to chemically synthesized magnetite nanoparticles [5][6], magnetosomes have a perfect crystal structure, a narrow size
  • distribution, and a high saturation magnetization close to that of bulk magnetite. In particular, magnetotactic bacteria M. gryphiswaldense produce linear chains of quasi-spherical magnetite nanoparticles with sizes ranging from 30 to 50 nm [1][2][7][8][9]. However, there are also magnetotactic bacteria that
  • produce elongated magnetite nanoparticles [1][2][10][11]. A linear chain of uniformly magnetized magnetosomes grown inside a magnetotactic bacterium is a kind of magnetic needle that helps the bacterium navigate in the weak Earth's magnetic field in search of the best habitat [1][2][3][4]. Chains of
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Published 05 Feb 2024

CdSe/ZnS quantum dots as a booster in the active layer of distributed ternary organic photovoltaics

  • Gabriela Lewińska,
  • Piotr Jeleń,
  • Zofia Kucia,
  • Maciej Sitarz,
  • Łukasz Walczak,
  • Bartłomiej Szafraniak,
  • Jerzy Sanetra and
  • Konstanty W. Marszalek

Beilstein J. Nanotechnol. 2024, 15, 144–156, doi:10.3762/bjnano.15.14

Graphical Abstract
  • ; organic solar cells; quantum dots; Introduction Organic solar cells have been intensively developed in recent years as the third generation [1][2] of photovoltaic cells, next to dye-synthesized solar cells and perovskite cells. One of the relatively novel concepts of organic solar cells that yield higher
  • carried out for three incidence angles (65°, 70°, and 75°). A Bruker atomic force microscope (AFM) MULTIMODE 8 was used in the measurements in the ScanAsyst in Air mode, using silicon nitride probes (with a nominal tip radius of 2 nm and a spring constant equal to 0.4 N/m). The substrate was
  • ultraviolet with a small exponentially decreasing band up to 500–600 nm (Figure 2). The absorption band maximum is about 260 nm in the solid state (quartz was used as reference) and 330 nm in chloroform solution. The photoluminescence spectra, excited by a 405 nm laser, are shown in Figure 3. This type of
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Published 02 Feb 2024

Enhanced feedback performance in off-resonance AFM modes through pulse train sampling

  • Mustafa Kangül,
  • Navid Asmari,
  • Santiago H. Andany,
  • Marcos Penedo and
  • Georg E. Fantner

Beilstein J. Nanotechnol. 2024, 15, 134–143, doi:10.3762/bjnano.15.13

Graphical Abstract
  • been introduced [2][3]. Although these methods are gentler than contact mode, interpreting and controlling the vertical force exerted on the sample is not straightforward. To achieve a better tip–sample force control, Rosa-Zeiser et al. [4] presented an off-resonance dynamic mode called pulsed force
  • File 1, Figure S1A). In order to investigate the frequency response of the feedback controller, we define the closed-loop transfer function between error, E(s), and disturbance, D(s), in the Laplace domain as in Equation 2, where Tort, Tdelay, Ki denote the ORT period, the delay, and the integral gain
  • Ki. Through simulations based on Equation 2 we have determined that the ORT period and the delay impose a limit for the integral gain value (experimental results in Figure S1B, Supporting Information File 1). In order to prevent closed-loop oscillations caused by the resonance peak, it is necessary
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Published 01 Feb 2024

In situ optical sub-wavelength thickness control of porous anodic aluminum oxide

  • Aleksandrs Dutovs,
  • Raimonds Popļausks,
  • Oskars Putāns,
  • Vladislavs Perkanuks,
  • Aušrinė Jurkevičiūtė,
  • Tomas Tamulevičius,
  • Uldis Malinovskis,
  • Iryna Olyshevets,
  • Donats Erts and
  • Juris Prikulis

Beilstein J. Nanotechnol. 2024, 15, 126–133, doi:10.3762/bjnano.15.12

Graphical Abstract
  • applications in many fields of science and technology, including nanofabrication [1], optical coatings [2], sensing [3][4][5], and others [6]. Many synthesis protocols have been developed for precise control of the pore structure of PAAO [7], which allow for the creation of nanoscale patterns for various types
  • hPAAO is an integrated (effective) value obtained by collecting spectra from a surface area significantly larger than the microstructure of PAAO, including pores, pore walls, skeleton, and the interstitial rods [32], which have tens of nanometers difference in length. Figure 2 shows typical recorded
  • stage of anodization, the alumina layer may not be correctly represented by a single-layer effective RI. This typically resulted in fitting errors during the first 1–2 min of anodization (hPAAO < 200 nm) as shown in Figure 3a. Moreover, the LM algorithm is sensitive to the initial guess value of the fit
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Published 31 Jan 2024
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