Coherent amplification of radiation from two phase-locked Josephson junction arrays

• Mikhail A. Galin,
• Vladimir M. Krasnov,
• Ilya A. Shereshevsky,
• Nadezhda K. Vdovicheva and
• Vladislav V. Kurin

Beilstein J. Nanotechnol. 2022, 13, 1445–1457, doi:10.3762/bjnano.13.119

• measurement of current–voltage characteristic (IVC) and bolometric analysis of the emitted radiation. In all cases, we observe clear signatures of inter-array interaction. They occur when both arrays are biased at the same voltage and oscillate at the same frequency, coinciding with one of the cavity modes in

• bolometer is used for the detection of Josephson radiation. The detector and measurement procedure are the same as described in [9][12], where additional information can be found. The bolometer is based on a high-purity n-doped InSb crystal with dimension of 2–3 mm, which is placed approximately 0.5 cm

• measurement, the bias current in the outer array-a Ia was varied while the middle/inner array-b was biased at fixed values of current Ib = const. All other arrays remain unbiased and, therefore, inactive. Thus, we measure the dc voltage of array-b Vb and the full IVC of array-a Va(Ia). Simultaneously, the

Facile preparation of Au- and BODIPY-grafted lipid nanoparticles for synergized photothermal therapy

• Yuran Wang,
• Xudong Li,
• Haijun Chen and
• Yu Gao

Beilstein J. Nanotechnol. 2022, 13, 1432–1444, doi:10.3762/bjnano.13.118

• taken out to measure the amount of the released drug by UV–vis spectroscopy, and an equal volume of fresh release medium was added to keep the volume constant. Photothermal measurement for AB-LNPs To study the photothermal properties of AB-LNPs, different concentrations of AB-LNPs with BDP

Orally administered docetaxel-loaded chitosan-decorated cationic PLGA nanoparticles for intestinal tumors: formulation, comprehensive in vitro characterization, and release kinetics

• Sedat Ünal,
• Osman Doğan and
• Yeşim Aktaş

Beilstein J. Nanotechnol. 2022, 13, 1393–1407, doi:10.3762/bjnano.13.115

• supernatant. Thus, the ability of NPs to penetrate first through the mucus layer and then reach the gelatin layer was assessed by measurement of the amount of DCX transported into the gelatin layer. Release kinetics study In vitro release profiles of DCX from DCX-PLGA NPs and CS/DCX-PLGA NPs formulations were

Dry under water: air retaining properties of large-scale elastomer foils covered with mushroom-shaped surface microstructures

• Matthias Mail,
• Stefan Walheim,
• Thomas Schimmel,
• Wilhelm Barthlott,
• Stanislav N. Gorb and
• Lars Heepe

Beilstein J. Nanotechnol. 2022, 13, 1370–1379, doi:10.3762/bjnano.13.113

• ) investigations. a) Schematic drawing of the principle of the measurement. The sample is submerged under water and keeps an air layer. The laser beam of the CLSM is reflected at the air–water interface. This enables the 3 dimensional analysis of the air layer. b) Result of the measurement directly after

• bright areas of the image while the MSM in between appear darker. It could be seen that the shape of the air layer is almost completely flat. c) Results of the measurement of the same sample after 2 weeks under water. Still the air–water interface is spanned between the tips of the MSM. The cross section

Laser-processed antiadhesive bionic combs for handling nanofibers inspired by nanostructures on the legs of cribellate spiders

• Sebastian Lifka,
• Kristóf Harsányi,
• Erich Baumgartner,
• Lukas Pichler,
• Dariya Baiko,
• Karsten Wasmuth,
• Johannes Heitz,
• Marco Meyer,
• Anna-Christin Joel,
• Jörn Bonse and
• Werner Baumgartner

Beilstein J. Nanotechnol. 2022, 13, 1268–1283, doi:10.3762/bjnano.13.105

• Figure S1 in Supporting Information File 1. In Figure 7, the peel-off force measurement is exemplified for the polished (Figure 7a) and LIPSS-covered (Figure 7b) steel samples. The applied weights and, hence, the normal forces are equal in Figure 7a and Figure 7b. The cone diameter d of the nanofiber

• in Table 1, the measured values of the randomly rough surfaces are listed in Table 2. All measurement results are also graphically shown as bar plots in Figure 8. According to Table 1, the mean peel-off forces per unit length were 2.02 N/m for the LIPSS-covered Ti alloy and 2.79 N/m for the LIPSS

• reduced by approximately 40% (P240 grit size) and 65% (80 grit size), respectively. The investigated randomly rough surfaces did not reach the low peel-off forces for the LIPSS-covered samples. To prove the statistical significance of the measurement results, a statistical analysis was performed using

Studies of probe tip materials by atomic force microscopy: a review

• Ke Xu and
• Yuzhe Liu

Beilstein J. Nanotechnol. 2022, 13, 1256–1267, doi:10.3762/bjnano.13.104

• mechanical properties of the cantilever beam directly affect the performance, measurement resolution, and image quality of the AFM instrument. AFM probe tips [9][10] are generally fabricated with coatings, carbon nanotubes, magnetic nanoparticles, or even protein functionalization. A combination of probe

• of the internal Pd nanowires will help probe more surface conductivity measurement, the nanowires with nanostructure or form good ohmic contact to the characterization of surface, external carbon nanotubes provide higher mechanical stability, can make the probe after many times of measuring still

• keep its original shape. Low-resistance ohmic contacts between the metal surface and the PdNWCNT probe were confirmed. Moreover, repeated current flow and surface contact did not cause any damage to PdNWCNTs, indicating that the PdNWCNT probe is suitable for multi-probe conductivity measurement. In the

Roll-to-roll fabrication of superhydrophobic pads covered with nanofur for the efficient clean-up of oil spills

• Patrick Weiser,
• Robin Kietz,
• Marc Schneider,
• Matthias Worgull and
• Hendrik Hölscher

Beilstein J. Nanotechnol. 2022, 13, 1228–1239, doi:10.3762/bjnano.13.102

• on top of the nanofur are around the super hydrophobicity limit of 150° (see Figure 3b). This makes droplets easily roll off a sample even at minimal tilt (see the video in Supporting Information File 1). Contact angles were measured on a Dataphysics OCA 20 contact angle measurement machine using

• distilled water in the sessile drop method with a droplet volume of 1 µL. Due to the hydrophobic nature of the surface, drops tend to roll to areas with lower contact angles when performing measurements. This leads to slightly lowered average contact angles. The relatively high measurement uncertainty of

• , these contact angles are still sufficient for almost all typical applications, since the droplets easily roll off the surface even at minimal tilt of the sample. Furthermore the rather large measurement uncertainty of contact angle measurements, especially in the hydrophobic regime, has to be taken into

Rapid fabrication of MgO@g-C₃N₄ heterojunctions for photocatalytic nitric oxide removal

• Minh-Thuan Pham,
• Duyen P. H. Tran,
• Xuan-Thanh Bui and
• Sheng-Jie You

Beilstein J. Nanotechnol. 2022, 13, 1141–1154, doi:10.3762/bjnano.13.96

• properties of the materials. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HR-TEM) were used to assess the morphology of the materials. The crystal phase of the materials was determined by X-ray diffraction (XRD) with a measurement range of 10°–80°. Fourier

A cantilever-based, ultrahigh-vacuum, low-temperature scanning probe instrument for multidimensional scanning force microscopy

• Hao Liu,
• Zuned Ahmed,
• Sasa Vranjkovic,
• Manfred Parschau,
• Andrada-Oana Mandru and
• Hans J. Hug

Beilstein J. Nanotechnol. 2022, 13, 1120–1140, doi:10.3762/bjnano.13.95

• tuning fork force sensor became increasingly popular. In comparison to microfabricated cantilevers, the more macroscopic tuning forks, however, lack sensitivity, which limits the measurement bandwidth. Moreover, multimodal and multifrequency techniques, such as those available in cantilever-based AFM

• ultrahigh vacuum (UHV) conditions is beneficial for increasing measurement sensitivity, measuring samples at low temperatures [1], analyzing reactive surfaces [2], and studying atomic or molecular adsorbents with atomic or submolecular resolution [3]. The first AFM images with true atomic resolution were

• measurement bandwidths (typically below 10 Hz [13]) have to be used. These may be sufficient to record 2D images of a few square nanometers of scan size but will lead to extremely long measurement times for the acquisition of three-dimensional force volume maps (i.e., multiple 2D images). For example, the 3D

Recent advances in green carbon dots (2015–2022): synthesis, metal ion sensing, and biological applications

• Aisha Kanwal,
• Naheed Bibi,
• Sajjad Hyder,
• Arif Muhammad,
• Hao Ren,
• Jiangtao Liu and
• Zhongli Lei

Beilstein J. Nanotechnol. 2022, 13, 1068–1107, doi:10.3762/bjnano.13.93

• future applications in other disciplines [107]. Atchudan et al. reported a hydrothermal synthesis technique that yields CDs from Morus nigra (black mulberry) fruit juice [81]. This low-cost synthesis approach provides an effective, robust, and eco-friendly nanoscale sensor for the measurement of Fe3

Effects of focused electron beam irradiation parameters on direct nanostructure formation on Ag surfaces

• Jānis Sniķeris,
• Vjačeslavs Gerbreders,
• Andrejs Bulanovs and
• Ēriks Sļedevskis

Beilstein J. Nanotechnol. 2022, 13, 1004–1010, doi:10.3762/bjnano.13.87

• value of WD was adjusted to maintain d constant while changing I. Since the range of WD was limited by the movement of the SEM stage, it was impossible to fit the whole range of I in a single value of d without the risk of hitting the sample with the electron gun. Therefore, this measurement was split

Interaction between honeybee mandibles and propolis

• Leonie Saccardi,
• Franz Brümmer,
• Jonas Schiebl,
• Oliver Schwarz,
• Alexander Kovalev and
• Stanislav Gorb

Beilstein J. Nanotechnol. 2022, 13, 958–974, doi:10.3762/bjnano.13.84

• radii of the circles were measured and then averaged. The effective elastic modulus and pull-off force of propolis were measured with a microforce measurement device (Basalt-01; Tetra GmbH, Ilmenau, Germany) [22][23][24]. The device mainly consists of micromanipulators as a platform holding the

• -shaped tip of the bee mandible, starting at the sharp edge and moving towards the hairy edge (Figure 3C). Another measurement with an extended contact time of 60 s was performed on the flat area of the bee mandible. Afterwards, six reference measurements were carried out on a smooth, clean glass surface

• substance coating the mandible surface was measured on SEM images of fresh fractures of untreated bee mandibles using Gimp, version 2.10.14. For this purpose, two measurement lines were drawn: one along the surface of the cuticle and one along the surface of the substance on top of the cuticle. The angle

Design of a biomimetic, small-scale artificial leaf surface for the study of environmental interactions

• Miriam Anna Huth,
• Axel Huth,
• Lukas Schreiber and
• Kerstin Koch

Beilstein J. Nanotechnol. 2022, 13, 944–957, doi:10.3762/bjnano.13.83

• for an accurate measurement of the wax coverage. At 15.7 ± 2.6 µg·cm−2, it was the same as the wax coating of a wheat leaf (Figure 6). The wax coating of the technical surface thus corresponded in its chemical properties both qualitatively and quantitatively to the wax coating of the natural surface

Comparing the performance of single and multifrequency Kelvin probe force microscopy techniques in air and water

• Jason I. Kilpatrick,
• Emrullah Kargin and
• Brian J. Rodriguez

Beilstein J. Nanotechnol. 2022, 13, 922–943, doi:10.3762/bjnano.13.82

• gradient) between the tip and sample. CL techniques are more common than OL techniques due to the ease of implementation, wide-scale availability, and direct measurement of the apparent CPD. OL techniques, by contrast, are feedback-free and can be used to determine the CPD without the need to apply a DC

• ]. The regulation of tip–sample distance in KPFM imaging is generally performed by employing a feedback loop that maintains the mechanical oscillation amplitude of the cantilever at the fundamental eigenmode, ω1, at a fixed value. This precludes simultaneous measurement of electrostatic forces on this

• from measurements in order to access a true surface potential map [78][79]. A natural extension of AM-KPFM is dual-harmonic KPFM (DH-KPFM), which is an OL technique that utilizes the measurement of both the first and second harmonic of the electrostatic response (ωe and 2ωe). By combining these two

Solar-light-driven LaFe_xNi_1−xO₃ perovskite oxides for photocatalytic Fenton-like reaction to degrade organic pollutants

• Chao-Wei Huang,
• Shu-Yu Hsu,
• Jun-Han Lin,
• Yun Jhou,
• Wei-Yu Chen,
• Kun-Yi Andrew Lin,
• Yu-Tang Lin and
• Van-Huy Nguyen

Beilstein J. Nanotechnol. 2022, 13, 882–895, doi:10.3762/bjnano.13.79

• ratio of 7/3 could obtain the largest crystal diameter with a better crystallinity. Meanwhile, the perovskite oxides with the Fe/Ni ratio of 7/3 had the highest specific surface area according to the BET BET measurement, which was conducive to photocatalysis. Furthermore, with changing the conditions

DNA aptamer selection and construction of an aptasensor based on graphene FETs for Zika virus NS1 protein detection

• Nathalie B. F. Almeida,
• Thiago A. S. L. Sousa,
• Viviane C. F. Santos,
• Camila M. S. Lacerda,
• Thais G. Silva,
• Rafaella F. Q. Grenfell,
• Flavio Plentz and
• Antero S. R. Andrade

Beilstein J. Nanotechnol. 2022, 13, 873–881, doi:10.3762/bjnano.13.78

• /mL. The inset highlights the portion of each graphene transfer curve extending from 0.00 to 0.20 V. In each measurement, ZIKV NS1 protein was diluted in human serum, which was used as electrolyte for gating. Calibration curve for ZIKV NS1 protein detection. Percentage change in graphene resistance

Optimizing PMMA solutions to suppress contamination in the transfer of CVD graphene for batch production

• Chun-Da Liao,
• Andrea Capasso,
• Tiago Queirós,
• Telma Domingues,
• Fatima Cerqueira,
• Nicoleta Nicoara,
• Jérôme Borme,
• Paulo Freitas and
• Pedro Alpuim

Beilstein J. Nanotechnol. 2022, 13, 796–806, doi:10.3762/bjnano.13.70

• frequency. The AFM measurement was carried out in tapping mode. A 633 nm laser light aimed at the back side of the cantilever tip was reflected toward a position-sensitive photodetector, which provides feedback signals to piezoelectric scanners that maintain the cantilever tip at constant height (force

• Wafer 2. The source–drain resistance of the GFETs was measured with a semi-automatic DC measurement probe station for 8″ wafers. The setup uses a 40-tip probe head with 250 µm spacing between the tips; each probe allowed us to measure 20 devices simultaneously. A current was injected into each

Efficient liquid exfoliation of KP₁₅ nanowires aided by Hansen's empirical theory

• Zhaoxuan Huang,
• Zhikang Jiang,
• Nan Tian,
• Disheng Yao,
• Fei Long,
• Yanhan Yang and
• Danmin Liu

Beilstein J. Nanotechnol. 2022, 13, 788–795, doi:10.3762/bjnano.13.69

• concentration, centrifugation was not used. Measurement equipment UV−visible spectrophotometry was performed by using a Shimadzu UV-3101PC system. Atomic force microscopy (AFM) tests were performed in a Multimode 8 system. The Raman tests were performed on a WITec alpha300 RA confocal Raman microscopy system

• diffraction patterns of the synthesized KP15 were both theoretically calculated and experimentally measured. The consistency between the two patterns shows that there is no impurity phase (Figure 1b), which confirms an excellent crystallization quality of the KP15 bulks. Measurement of the absorption

Gelatin nanoparticles with tunable mechanical properties: effect of crosslinking time and loading

• Agnes-Valencia Weiss,
• Daniel Schorr,
• Julia K. Metz,
• Metin Yildirim,
• Saeed Ahmad Khan and
• Marc Schneider

Beilstein J. Nanotechnol. 2022, 13, 778–787, doi:10.3762/bjnano.13.68

• . demonstrated the impact of the measurement setup for polymeric nanoparticles [4]. Young’s moduli obtained by measurements conducted on bulk materials and nanoparticles composed of PLA and PLGA vary significantly from each other. Furthermore, they showed the impact of measurements in water and at physiological

• significant for all different crosslinking times. The absolut Young's modulus values are significantly lower than reported before [17]. This can be due to different reasons such as a batch to batch variance of gelatin as a natural product, a difference in the measurement speed during the AFM experiment and

• . Measurement of size and zeta-potential Particle size and size distribution were measured based on dynamic light scattering using a ZetaSizer® Ultra (Malvern Panalytics, Malvern, United Kingdom). 50 µL of GNP dispersion was diluted 20-fold, the pH was adjusted to 7.5, and the samples were measured in the

Direct measurement of surface photovoltage by AC bias Kelvin probe force microscopy

• Masato Miyazaki,
• Yasuhiro Sugawara and
• Yan Jun Li

Beilstein J. Nanotechnol. 2022, 13, 712–720, doi:10.3762/bjnano.13.63

• force This signal is measured with a lock-in amplifier and compensated by VAC control, yielding the SPV value. To improve the sensitivity, ωm is usually tuned to the second (first) resonance frequency of the cantilever, while the first (second) resonance frequency is assigned to the AFM measurement [29

• of the rutile TiO2(110) surface. Terrace and step structures were observed, and the surface was flat within a single step height of 325 pm [50]. Figure 3b shows the SPV image obtained simultaneously with the AFM image. No tunneling current was detected in the AC-KPFM measurement. The SPV profile is

• . Circles and solid lines are experimental data and fit results, respectively. AC-KPFM imaging for SPV measurement. (a) Topographic and (b) SPV images of TiO2(110) surface. (c) SPV profile along the blue line in (b). The acquisition parameters are fm = 100 Hz, Δf = −80 Hz, VDC = −0.3 V, and an imaging size

Nanoarchitectonics of the cathode to improve the reversibility of Li–O₂ batteries

• Hien Thi Thu Pham,
• Jonghyeok Yun,
• So Yeun Kim,
• Sang A Han,
• Jung Ho Kim,
• Jong-Won Lee and
• Min-Sik Park

Beilstein J. Nanotechnol. 2022, 13, 689–698, doi:10.3762/bjnano.13.61

• determined by a porosity analyzer (Micromeritics, Tristar II 3020). The electrical conductivity measurements were conducted by the four-point probe method using a power resistivity measurement system (MCP-PD51) at different applied pressures ranging from 5 to 20 kN. The thermal stability was examined by TGA

Antibacterial activity of a berberine nanoformulation

• Hue Thi Nguyen,
• Tuyet Nhung Pham,
• Anh-Tuan Le,
• Nguyen Thanh Thuy,
• Tran Quang Huy and
• Thuy Thi Thu Nguyen

Beilstein J. Nanotechnol. 2022, 13, 641–652, doi:10.3762/bjnano.13.56

• BBR NPs. The mean size of the particles measured by DLS was 156 nm for BBR NPs at a concentration of 2.0 mg/mL. The particle size measured by DLS was larger than the size obtained from TEM analysis because this dynamic measurement is affected by the concentration of the solution, surface properties of

• concentration of 2.0 mg/mL. FTIR spectra of (a) glycerol, (b) pure BBR, and (c) BBR NPs at a concentration of 2.0 mg/mL. Morphology of (a) pure BBR and (b) BBR NPs and (c) DLS measurement of BBR NPs. Antibacterial activity of negative control, pure BBR at the saturation concentration of 2.0 mg/mL, and BBR NPs

• and BBR NPs at different concentrations. Supporting Information Supporting Information features the raw DLS measurement data. Supporting Information File 50: Raw DLS data. Funding This work is funded by the National Foundation of Science and Technology (NAFOSTED) of Vietnam, grant 108.99-2020.08.

Fabrication and testing of polymer microneedles for transdermal drug delivery

• Vahid Ebrahiminejad,
• Zahra Faraji Rad,
• Philip D. Prewett and
• Graham J. Davies

Beilstein J. Nanotechnol. 2022, 13, 629–640, doi:10.3762/bjnano.13.55

• measurement of FPL and APE affect the fidelity and repeatability of results [21]. To mimic the in vivo conditions of the skin, some researchers pre-stretch the sample [27][28]. But the uncontrolled initial skin strain may yield different results for otherwise similar experiments. Shu et al. recently indicated

• ), respectively. The results recorded for the cycles 1, 15, and 30 indicated the respective average projection’s axial shrinkages of 4.72 ± 0.15%, 5.37 ± 0.27%, 4.9 ± 0.21% (mean ± standard deviation) (ANOVA, p < 0.001). Measurement for base diameters indicated enlargements of 3.22 ± 0.21%, 2.02 ± 0.33%, 1.07

Quantitative dynamic force microscopy with inclined tip oscillation

• Philipp Rahe,
• Daniel Heile,
• Reinhard Olbrich and
• Michael Reichling

Beilstein J. Nanotechnol. 2022, 13, 610–619, doi:10.3762/bjnano.13.53

• interaction force, the measurement observables, and the probe excitation parameters is defined by an average of the normal force along the sampling path over the oscillation cycle. Usually, it is tacitly assumed that tip oscillation and force data recording follows the same path perpendicular to the surface

• measuring a heterogeneous atomic surface. We propose to measure the AFM observables along a path parallel to the oscillation direction in order to reliably recover the force along this direction. Keywords: atomic force microscopy; cantilever; quantitative force measurement; sampling path; Introduction

• equations that link the physical interaction parameters force and damping with the measurement observables static deflection qs, oscillation amplitude A, and phase φ as well as the excitation parameters frequency fexc and force Fexc. This theory specifically predicts the distant-dependent frequency shift

Sodium doping in brookite TiO₂ enhances its photocatalytic activity

• Boxiang Zhuang,
• Honglong Shi,
• Honglei Zhang and
• Zeqian Zhang

Beilstein J. Nanotechnol. 2022, 13, 599–609, doi:10.3762/bjnano.13.52

• titanium dioxide, 7 g of the precipitate from different batches was uniformly mixed and divided into seven parts, which were then calcinated at 300–900 °C for 2 h to obtain the products. Photocatalytic activity measurement The photocatalytic activity of the products was examined by photodegrading the