Characterization, bio-uptake and toxicity of polymer-coated silver nanoparticles and their interaction with human peripheral blood mononuclear cells

• Sahar Pourhoseini,
• Reilly T. Enos,
• Angela E. Murphy,
• Bo Cai and
• Jamie R. Lead

Beilstein J. Nanotechnol. 2021, 12, 282–294, doi:10.3762/bjnano.12.23

• aggregation of NPs was observed in the RPMI medium over the exposure time (24 h). A dose-dependent relationship between PBMC uptake and Ag concentration was detected for both AgNP and AgNO3 treatment. There was approximately a two-fold increase in cellular Ag uptake in the AgNO3 vs the NP treatment

• . However, for the AgNO3 treatment, this ratio increased in a dose-dependent manner (Table 2). Impact of PVP-AgNPs and Ag ions on viability and metabolic activity of PBMCs Cell membrane integrity as a marker for cell viability was measured by LDH release; a greater LDH release is an indication of more

• LDH release was detected at any concentration. Both PVP-AgNPs and AgNO3 increased the LDH release in a dose-dependent manner compared to the control (without Ag), beginning from 100 µg·L−1 (Figure 5a). No significant toxicity was observed at 10 µg·L−1 concentration. The LDH test for AgNO3-PVP showed a

Gold(I) N-heterocyclic carbene precursors for focused electron beam-induced deposition

• Cristiano Glessi,
• Aya Mahgoub,
• Cornelis W. Hagen and
• Mats Tilset

Beilstein J. Nanotechnol. 2021, 12, 257–269, doi:10.3762/bjnano.12.21

• pillar its total deposition time is converted to the total number of incident electrons, or electron dose, used to deposit that pillar. Figure 6 shows that the shapes of the pillar deposits from different precursors are different. Therefore, the volume was chosen to fairly compare the growth rate of the

• different precursors. The height and diameter of the pillars were measured and used to calculate the volume. Figure 7 shows the calculated deposit volumes as a function of the electron dose. Clearly different deposition rates are found ranging from 3 × 10−5 to 1 × 10−2 nm3/e−, assuming linear growth. For

• Information File 1. Deposits from all precursors show a rather linear increase in height with electron dose (Figure S20a, Supporting Information File 1), whereas the deposit diameter increases at first but saturates at higher doses (Figure S20b, Supporting Information File 1). The saturation values differ

TiO_x/Pt₃Ti(111) surface-directed formation of electronically responsive supramolecular assemblies of tungsten oxide clusters

• Marco Moors,
• Yun An,
• Agnieszka Kuc and
• Kirill Yu. Monakhov

Beilstein J. Nanotechnol. 2021, 12, 203–212, doi:10.3762/bjnano.12.16

• layer termination, which is described in detail in [28]. The z’-TiOx phase was formed by exposing the clean Pt3Ti(111) surface to 150 L of oxygen (150 s at p(O2) = 1.33 × 10−6 mbar), while the sample was kept at a temperature of 1000 K. Exposing the clean Pt3Ti(111) surface to an oxygen dose of 600 L

A review on the biological effects of nanomaterials on silkworm (Bombyx mori)

• Sandra Senyo Fometu,
• Guohua Wu,
• Lin Ma and
• Joan Shine Davids

Beilstein J. Nanotechnol. 2021, 12, 190–202, doi:10.3762/bjnano.12.15

• ), sensitivity, and moderate body size make Caenorhabditis elegans (nematode) [45] an ideal model organism to study environmental nanotoxicity at the nanoscale level. C. elegans was used as a model organism to evaluate the impact of an exposure to a 50–100 mg/L dose of graphite, graphite oxide nanoplatelets, and

• similarities between silkworms and Mus musculus (mice) regarding their response to antifungals. The median effective dose (ED50) and the median lethal dose (LD50) of Candida tropicalis and of Candida albicans were introduced into the silkworm and it was reported that the response of the silkworm to

• autophagy, apoptosis, and necrosis in the hemocytes. Xing et al. [154] studied the outcome of introducing Si NPs in the hemolymph of the silkworm. It was reported that 3.9 µg of Si NPs was toxic to the hemocytes when compared to the groups exposed to 0.39 and 0.039 µg of Si NPs. A high dose of Si NPs (3.9

Imaging of SARS-CoV-2 infected Vero E6 cells by helium ion microscopy

• Natalie Frese,
• Patrick Schmerer,
• Martin Wortmann,
• Matthias Schürmann,
• Matthias König,
• Michael Westphal,
• Friedemann Weber,
• Holger Sudhoff and
• Armin Gölzhäuser

Beilstein J. Nanotechnol. 2021, 12, 172–179, doi:10.3762/bjnano.12.13

•  2a2). Figure 2a3 shows the same region as Figure 2a1, but the parts that were previously imaged at high magnification (FOV of 4.5 μm) with a dose of 1.4 × 1016 ions/cm2 appear noticeably brighter. This is caused by He+ beam-induced carbonaceous deposits resulting in a thin conductive coating. In

• ) of the cell seen in Figure 2b1, showing the virus particles on top of the cell membrane in a side view. Note that after the zoom-out in Figure 2c1, the previously imaged regions appear again brighter. After imaging Figure 2c2 with a dose of 1.9 × 1017 ions/cm2, the flood gun was turned off, which

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

• degrees of the samples in RAW 264.7 cells (the cytotoxicity of the samples was dose-dependent) and by the flow cytometry results (see below). Ion release experiments For the investigation of released lanthanide ions, UC@thin_NH2 and UC@thick_NH2, as representative samples of thin- and thick-shelled

Electron beam-induced deposition of platinum from Pt(CO)₂Cl₂ and Pt(CO)₂Br₂

• Aya Mahgoub,
• Hang Lu,
• Rachel M. Thorman,
• Konstantin Preradovic,
• Titel Jurca,
• Lisa McElwee-White,
• Howard Fairbrother and
• Cornelis W. Hagen

Beilstein J. Nanotechnol. 2020, 11, 1789–1800, doi:10.3762/bjnano.11.161

• scanning electron microscope (SEM), wherein series of pillars were successfully grown from both precursors. The growth of the pillars was studied as a function of the electron dose and compared to deposits grown from the commercially available precursor MeCpPtMe3. The composition of the deposits was

• pressure (8 × 10−6 mbar). The pillars deposited from Pt(CO)2Cl2 have a conical shape, and the height is smaller and seems to saturate much more rapidly with electron dose than for the pillars deposited from MeCpPtMe3 (Figure 5). Note that in Figure 5 the dose is plotted as the total number of incident

• electrons used to grow a pillar, that is, the beam current multiplied by the total dwell time at the location of exposure, excluding the waiting time. For point exposures, this is a better-defined measure than the dose per unit area. Although the diameters of the pillars from Pt(CO)2Cl2, as judged from

PEG/PEI-functionalized single-walled carbon nanotubes as delivery carriers for doxorubicin: synthesis, characterization, and in vitro evaluation

• Shuoye Yang,
• Zhenwei Wang,
• Yahong Ping,
• Yuying Miao,
• Yongmei Xiao,
• Lingbo Qu,
• Lu Zhang,
• Yuansen Hu and
• Jinshui Wang

Beilstein J. Nanotechnol. 2020, 11, 1728–1741, doi:10.3762/bjnano.11.155

• biocompatible SWCNT nanocarriers with low cytotoxicity. All DOX formulations exhibit effective anticancer activity against MCF-7 cells, and the cytotoxicity is observed to be dose-dependent (Figure 7B). It is noted that DOX-loaded CNT carriers show an enhanced inhibitory effects toward MCF-7 cells in comparison

Out-of-plane surface patterning by subsurface processing of polymer substrates with focused ion beams

• Serguei Chiriaev,
• Luciana Tavares,
• Vadzim Adashkevich,
• Arkadiusz J. Goszczak and
• Horst-Günter Rubahn

Beilstein J. Nanotechnol. 2020, 11, 1693–1703, doi:10.3762/bjnano.11.151

• substrates. As a result, the total depth change observed in the PC substrate at the highest dose (7.5 × 1015 cm−2) is approx. 2.5 times smaller than that in the case of the PMMA substrate. This difference can result from a combination of several factors related to the polymer structure and composition, as

• irradiation dose, the PDMS material first shrinks, then swells, and then shrinks again. The concave shapes of the surface inside of the irradiated PDMS regions can, to a large extent, be attributed to the elasticity of this material. A very low Young’s modulus for the Sylgard-184 PDMS material, ranging from

• PDMS sample induced by ion irradiation include irreversible changes in the material structure and in the elastic properties with an increase in the irradiation dose [21][22][23][24][25]. These factors can contribute significantly to set the threshold dose for the first strain-driven transition and can

Cardiomyocyte uptake mechanism of a hydroxyapatite nanoparticle mediated gene delivery system

• Hiroaki Komuro,
• Masahiro Yamazoe,
• Kosuke Nozaki,
• Akiko Nagai and
• Tetsuo Sasano

Beilstein J. Nanotechnol. 2020, 11, 1685–1692, doi:10.3762/bjnano.11.150

• approximately 1.3 wt % [24]. Cytotoxicity assay Dose-dependent cytotoxicity of HAp/pDNA complexes on HL-1 cells was investigated in the concentration range of 0.1–10 µg/mL. The 3-(4,5-dimethylhiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay was used to assess cytotoxicity. No differences in cell

• dose-dependent manner. The amount of 0.75 µg was selected for subsequent cell experiments. The transfection efficiency of the HAp vector in HL-1 cells was three times higher than that of the endothelial cells in our previous study [22]. Endocytic pathway Under physiological conditions, nanoparticles

Helium ion microscope – secondary ion mass spectrometry for geological materials

• Matthew R. Ball,
• Richard J. M. Taylor,
• Joshua F. Einsle,
• Fouzia Khanom,
• Christelle Guillermier and
• Richard J. Harrison

Beilstein J. Nanotechnol. 2020, 11, 1504–1515, doi:10.3762/bjnano.11.133

• sample is taken to this instrument, but this leads to the implantation of gallium ions and can lead to potential damage to the sample if an incorrect dose is used. Instead, care should be taken to apply thin (5–10 nm) coating layers to the sample, to maximise analysis time on the instrument. Sample

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

• ][34] produces a scatter of the ΦMgO values on either side of the critical work function (Φcrit = 2.8 eV). Figure 5 shows the evolution of the ARUPS spectra with an increasing 6P dose on an MgO(100) film with ΦMgO = 2.58 eV (i.e., below Φcrit). In the MgO valence band region (Figure 5a), gradual

• changes can be observed. In the MgO bandgap region (magnified in Figure 5b), the intensities of the HOMO* and SOMO increase and reach their maximum value at a 6P dose between 1 and 1.5 Å. The increase in the molecular emission features is accompanied by an increase in the work function (ΔΦ, values listed

• on the right). The dose corresponding to a full 6P monolayer is estimated to be approximately 2.8 Å from the attenuation behavior of the valence band of the underlying MgO. The fact that the molecular emissions and Φ saturate well before the completion of the ML suggests that a significant number of

Wafer-level integration of self-aligned high aspect ratio silicon 3D structures using the MACE method with Au, Pd, Pt, Cu, and Ir

• Mathias Franz,
• Romy Junghans,
• Paul Schmitt,
• Adriana Szeghalmi and
• Stefan E. Schulz

Beilstein J. Nanotechnol. 2020, 11, 1439–1449, doi:10.3762/bjnano.11.128

• etching bath consists of 730 mL of deionised water and 70 mL of HF (40 vol %). Additionally, a variable dose of H2O2 (30 wt %) has been added up to a volume of 20 mL. The etching solution had an HF concentration of 1.73 mol/L. The H2O2 concentration has been varied in a range of 0–0.24 mol/L. The typical

Effect of localized helium ion irradiation on the performance of synthetic monolayer MoS₂ field-effect transistors

• Jakub Jadwiszczak,
• Pierce Maguire,
• Conor P. Cullen,
• Georg S. Duesberg and
• Hongzhou Zhang

Beilstein J. Nanotechnol. 2020, 11, 1329–1335, doi:10.3762/bjnano.11.117

• ]. The average recorded beam current throughout the irradiations was 37.5 ± 0.4 pA, and the probe size was determined at approx. 7 nm [9]. The areal ion dose delivered to each sample was maintained at approx. 1017 ions cm−2, with a step size of 1 nm and a dwell time of 4.3 μs throughout the duration of a

• electrical testing, these dimensions were re-measured in the SEM to obtain accurate IR values in case of beam drift throughout the procedure. Results and Discussion As shown in Figure 1c, the localized irradiation (dose = 1017 ions cm−2, IR = 7%) causes a notably higher electrical conduction to emerge in the

• medium channel [36][37][38]. However, the role of other impurities such as hydrogen and carbon from adventitious surface hydrocarbons in the observed p-doping ought to also be considered in future studies. For a given delivered dose, the ion beam provides a high concentration of effective adsorption

An atomic force microscope integrated with a helium ion microscope for correlative nanoscale characterization

• Santiago H. Andany,
• Gregor Hlawacek,
• Stefan Hummel,
• Charlène Brillard,
• Mustafa Kangül and
• Georg E. Fantner

Beilstein J. Nanotechnol. 2020, 11, 1272–1279, doi:10.3762/bjnano.11.111

• . Figure 3a and Figure 3b show two AFM topography images of PMMA exposed to a dose of 1 × 1013 cm−2 and 3 × 1013 cm−2 30 keV He ions, respectively, as well as the corresponding height profiles of the irradiated PMMA surface. Focused ion beam damage and implantation can hinder the imaging and nanoscale

3D superconducting hollow nanowires with tailored diameters grown by focused He⁺ beam direct writing

• Rosa Córdoba,
• Alfonso Ibarra,
• Dominique Mailly,
• Isabel Guillamón,
• Hermann Suderow and
• José María De Teresa

Beilstein J. Nanotechnol. 2020, 11, 1198–1206, doi:10.3762/bjnano.11.104

• tungsten carbide nanowires with tailored diameters by tuning two key growth parameters, namely current and dose of the ion beam. Our results show the control of geometry in 3D hollow nanowires, with outer and inner diameters ranging from 36 to 142 nm and from 5 to 28 nm, respectively; and lengths from 0.5

• for the growth of these 3D nano-objects. Nevertheless, it is worth mentioning that its resolution, volume per dose and throughput are very sensitive to the selected growth conditions such as ion beam energy, ion beam current, precursor flux, surface interactions with the beam, and precursor molecules

• grown using a HIM. The hollow NW geometry is successfully controlled by tuning the ion beam current and dose from 0.65 to 7 pA and from 0.1 to 0.4 nC, respectively, resulting in NWs with outer diameters from 36 to 142 nm and with inner diameters from 5 to 28 nm, and total length from 0.5 to 8.9 µm

Applications of superparamagnetic iron oxide nanoparticles in drug and therapeutic delivery, and biotechnological advancements

• Maria Suciu,
• Corina M. Ionescu,
• Alexandra Ciorita,
• Septimiu C. Tripon,
• Dragos Nica,
• Hani Al-Salami and
• Lucian Barbu-Tudoran

Beilstein J. Nanotechnol. 2020, 11, 1092–1109, doi:10.3762/bjnano.11.94

• very important for medical applications. These properties depend on the methods used, targeted organs/tissues, image resolution, administration way and dosage, and toxicity [116]. Fakhar-e-Alam and collaborators [117] observed that above a certain dose cancer cells develop a resistance to ligand

• that starch-coated SPIONs (BNF-starch) were taken up by human adipose tissue-derived stem cells in a dose-dependent manner. After 24 h these SPIONs ended up in lysosomes where they were degraded to Fe ions. Arbab and collaborators [129] attempted to find out the necessary lysosomal pH value for the

• , structurally, and metabolically. Uchiyama et al. studied the toxicity of ultrasmall (7 nm) cationic iron oxide particles. They found that at a dose of 10 mg/kg, the ethylamine-coated particles did not induce hemorrhage, clots, inflammation or biochemical imbalance in rats in vivo and ex vivo experiments [157

Uniform Fe₃O₄/Gd₂O₃-DHCA nanocubes for dual-mode magnetic resonance imaging

• Miao Qin,
• Yueyou Peng,
• Mengjie Xu,
• Hui Yan,
• Yizhu Cheng,
• Xiumei Zhang,
• Di Huang,
• Weiyi Chen and
• Yanfeng Meng

Beilstein J. Nanotechnol. 2020, 11, 1000–1009, doi:10.3762/bjnano.11.84

• imaging (T1WI) and T2-weighted imaging (T2WI) were performed in Sprague Dawley (SD) rats. After intravenous injection of a 0.8 mg Fe/kg dose, FGDA nanocubes spread systemically through the bloodstream. The lumbar muscle was chosen as the MRI region of interest and the signal-to-noise ratio (ΔSNR) was

• were injected in the tail vein, at a dose of 0.8 mg Fe/kg, the MRI was performed at 10, 30 and 60 min post-injection. Histological staining Immediately after the MRI, the rats were euthanized by a lethal intravenous injection of chloral hydrate. The lumbar muscles were harvested, placed into 4

• % paraformaldehyde solution and processed for Prussian blue staining. In vivo toxicity evaluation of FGDA nanocubes FGDA nanocubes were injected intravenously at a dose of 2 mg Fe/kg. Alternatively, the control group received a normal saline intravenous injection. After two weeks, the rats were euthanized by

Key for crossing the BBB with nanoparticles: the rational design

• Sonia M. Lombardo,
• Marc Schneider,
• Akif E. Türeli and
• Nazende Günday Türeli

Beilstein J. Nanotechnol. 2020, 11, 866–883, doi:10.3762/bjnano.11.72

• (olfactory pathway) and the trigeminal nerve (trigeminal pathway) directly to the CNS [11][12][13]. This innovative route has attracted lots of attention in the last few years and seems promising [14][15][16]. However, the intranasal route has drawbacks such as a high variability of the delivered dose

• toxic effects and did not disrupt the BBB at the dose used [50]. At the same time, Lück published in his thesis that apolipoprotein E (ApoE) was adsorbed on the surface of nanoparticles coated with polysorbate 20, 40, 60 or 80 after their incubation in human plasma [51]. However, ApoE was not adsorbed

• 10–15 nm were able to cross the BBB and reach the brain. However, the vast majority of the administered dose was found in the liver and in the blood [134][135][136]. Moreover, the amount of gold found in the brain was dependent on the AuNP dose, showing no sign of saturation at the doses tested. This

Hexagonal boron nitride: a review of the emerging material platform for single-photon sources and the spin–photon interface

• Stefania Castelletto,
• Faraz A. Inam,
• Shin-ichiro Sato and
• Alberto Boretti

Beilstein J. Nanotechnol. 2020, 11, 740–769, doi:10.3762/bjnano.11.61

• with 10 keV gallium ions at a dose of 10−14 C/µm2 with subsequent annealing with argon at 1 Torr and 750 °C for 30 min. The lifetime, brightness, and PL stability of this SPE are similar to those in 2D h-BN, however with a wavelength variation smaller by a factor of five as compared to the SPEs in 2D h

Brome mosaic virus-like particles as siRNA nanocarriers for biomedical purposes

• Alfredo Nuñez-Rivera,
• Pierrick G. J. Fournier,
• Danna L. Arellano,
• Ana G. Rodriguez-Hernandez,
• Rafael Vazquez-Duhalt and
• Ruben D. Cadena-Nava

Beilstein J. Nanotechnol. 2020, 11, 372–382, doi:10.3762/bjnano.11.28

• limited because only a small fraction of the administered dose of the drug arrives into the tumors [1][2][3]. This can be attributed, in part, to a series of biological barriers that reduce the drug accumulation in tumors [4] such as sequestration by the mononuclear phagocyte system [5], non-specific

Internalization mechanisms of cell-penetrating peptides

• Ivana Ruseska and
• Andreas Zimmer

Beilstein J. Nanotechnol. 2020, 11, 101–123, doi:10.3762/bjnano.11.10

• -cyclodextrin (which depletes cell surface associated cholesterol) and macropinocytosis-specific inhibitors (such as cytochalasin D, an inhibitor of F-actin or EIPA, an inhibitor or the Na+/H+ exchange), a dose-dependent reduction of the internalized peptide was observed, which led to the conclusion that TAT

Bombesin receptor-targeted liposomes for enhanced delivery to lung cancer cells

• Mohammad J. Akbar,
• Pâmela C. Lukasewicz Ferreira,
• Melania Giorgetti,
• Leanne Stokes and
• Christopher J. Morris

Beilstein J. Nanotechnol. 2019, 10, 2553–2562, doi:10.3762/bjnano.10.246

• the purposes of enhanced liposome delivery to lung cancer. Results and Discussion GRPR as a target in lung cancer The functionality of GRPR in SCLC cells was confirmed by Fura-2 studies in which NCI-H345 or NCI-H82 SCLC cell models were exposed to a dose-range of the canonical GRPR agonist peptide

• , Tyr4-Bn. A dose-dependent increase in intracellular calcium release was observed for NCI-H345 but not the GRPR deficient SCLC line, NCI-H82 (Figure 1a,b), as previously reported [17][18]. The physiological role of GRPR includes the stimulation of a mitogenic response after receptor internalisation [19

Mobility of charge carriers in self-assembled monolayers

• Zhihua Fu,
• Tatjana Ladnorg,
• Hartmut Gliemann,
• Alexander Welle,
• Asif Bashir,
• Michael Rohwerder,
• Qiang Zhang,
• Björn Schüpbach,
• Andreas Terfort and
• Christof Wöll

Beilstein J. Nanotechnol. 2019, 10, 2449–2458, doi:10.3762/bjnano.10.235

• . Time-of-flight secondary ion mass spectrometry (TOF-SIMS) measurements were carried out in a TOF-SIMS 5 device (ION-TOF GmbH, Münster, Germany). The spectrometry was performed in static SIMS mode (primary ion beam dose < 2 × 1011 ions/cm2) with Bi3+ primary ions at 25 keV. Spectra were calibrated on

Deterministic placement of ultra-bright near-infrared color centers in arrays of silicon carbide micropillars

• Stefania Castelletto,
• Abdul Salam Al Atem,
• Faraz Ahmed Inam,
• Hans Jürgen von Bardeleben,
• Sophie Hameau,
• Ahmed Fahad Almutairi,
• Gérard Guillot,
• Shin-ichiro Sato,
• Alberto Boretti and
• Jean Marie Bluet

Beilstein J. Nanotechnol. 2019, 10, 2383–2395, doi:10.3762/bjnano.10.229

• irradiation dose. In Figure 6c the measured lifetimes of NCVSi emission using a LP at 1319 nm were τ = 1.557 ± 0.006 ns in the pillar and τ = 1.621 ± 0.006 ns in the gap. The values were modeled using a single exponential. These short lifetimes indicate that the NCVSi center can be ideally used as a bright