Low uptake of silica nanoparticles in Caco-2 intestinal epithelial barriers

• Dong Ye,
• Mattia Bramini,
• Delyan R. Hristov,
• Sha Wan,
• Anna Salvati,
• Christoffer Åberg and
• Kenneth A. Dawson

Beilstein J. Nanotechnol. 2017, 8, 1396–1406, doi:10.3762/bjnano.8.141

• ’,6-diamidino-2-phenylindole (DAPI) for 5 min. The slides were then sealed by addition of Mowiol mounting medium (Calbiochem) and stored at 4 °C overnight. For image acquisition, tricolour visualization of cell organelles, nanoparticles and nuclei, was performed on a confocal microscope equipped with

Nano-engineered skin mesenchymal stem cells: potential vehicles for tumour-targeted quantum-dot delivery

• Liga Saulite,
• Dominyka Dapkute,
• Karlis Pleiko,
• Ineta Popena,
• Simona Steponkiene,
• Ricardas Rotomskis and
• Una Riekstina

Beilstein J. Nanotechnol. 2017, 8, 1218–1230, doi:10.3762/bjnano.8.123

• ]. Altogether, we propose several reasons why QD-labelled skin MSCs could serve as a promising NP delivery vector. First, QD labelling would enable MSC tracking and visualization of the tumour microenvironment. Next, the cells in the tumour would take up the released QDs and then the formation of ROS could be

Optical response of heterogeneous polymer layers containing silver nanostructures

• Miriam Carlberg,
• Florent Pourcin,
• Olivier Margeat,
• Judikaël Le Rouzo,
• Gérard Berginc,
• Rose-Marie Sauvage,
• Jörg Ackermann and
• Ludovic Escoubas

Beilstein J. Nanotechnol. 2017, 8, 1065–1072, doi:10.3762/bjnano.8.108

• information about the reflection, transmission, absorption of the material as well as the complex optical indices, n and k. Finite difference time domain simulations of nanoparticles in thin film layers allow the visualization of the nanoparticle interactions or the electric field enhancement on and around

• ) TEM image of the synthetized nanoprisms before centrifugation and c) visualization of the electric field enhancement normalized to the incident electric field in the nanoprism for wavelength of peak 1 under z-oriented (i) p-polarized light and (ii) s-polarized light, and for the wavelength of peak 2

Measuring adhesion on rough surfaces using atomic force microscopy with a liquid probe

• Juan V. Escobar,
• Cristina Garza and
• Rolando Castillo

Beilstein J. Nanotechnol. 2017, 8, 813–825, doi:10.3762/bjnano.8.84

• ., Russia) intended for 3D visualization of scanning tips (Figure 1). The grating with the sharp peaks was inspected with standard Si3N4 SPM cantilevers in contact mode. The scans were obtained with a scanning probe microscope in vacuum (1 × 10−4 Pa). The inverted images of the tip (not presented in this

Selective detection of Mg²⁺ ions via enhanced fluorescence emission using Au–DNA nanocomposites

• Tanushree Basu,
• Khyati Rana,
• Niranjan Das and
• Bonamali Pal

Beilstein J. Nanotechnol. 2017, 8, 762–771, doi:10.3762/bjnano.8.79

• clustering of gold nanorods around the DNA. As shown in Figure 5, the height of the sample from the surface was estimated to be around 20.3 nm. The brighter areas on the image had a maximum height of 20.3 nm. Figure 5d shows the amplitude of DNA–AuNR to be 38.2 mV. Figure 6 shows the 3D visualization of the

Phospholipid arrays on porous polymer coatings generated by micro-contact spotting

• Sylwia Sekula-Neuner,
• Monica de Freitas,
• Lea-Marie Tröster,
• Tobias Jochum,
• Pavel A. Levkin,
• Michael Hirtz and
• Harald Fuchs

Beilstein J. Nanotechnol. 2017, 8, 715–722, doi:10.3762/bjnano.8.75

• an optical reference DOPC doped with rhodamine was patterned in-between DNP-lipid structures (Figure 3a). After blocking with 10% BSA and subsequent washing, samples were incubated with anti-DNP IgE antibody labelled with Alexa 488 dye for direct visualization. Plotting of the mean fluorescence

• lipid into DOPC carrier. Next, after blocking with 10% BSA and binding of fluorescently labeled STV-Cy3, arrays were washed with PBS and blocked again with 10% BSA to prepare membranes for ARbiot binding. The coating of arrays with labeled STV allowed for direct visualization of the biotin arrays. In

Silicon microgrooves for contact guidance of human aortic endothelial cells

• Sara Fernández-Castillejo,
• Pilar Formentín,
• Úrsula Catalán,
• Josep Pallarès,
• Lluís F. Marsal and
• Rosa Solà

Beilstein J. Nanotechnol. 2017, 8, 675–681, doi:10.3762/bjnano.8.72

• microscope, equipped with a C1 laser confocal system (EZ-C1 software, Nikon). A 633 nm and 488 nm argon laser light was used as excitation sources for Phalloidin and NucGreen, respectively. Actin filaments and nuclei stain visualization using confocal microscopy was used to assess cellular morphology and

Optimizing qPlus sensor assemblies for simultaneous scanning tunneling and noncontact atomic force microscopy operation based on finite element method analysis

• Omur E. Dagdeviren and
• Udo D. Schwarz

Beilstein J. Nanotechnol. 2017, 8, 657–666, doi:10.3762/bjnano.8.70

• ; noncontact atomic force microscopy; quartz tuning forks; scanning tunneling microscopy; self-sensing probe; Introduction Scanning tunneling microscopy (STM) [1] and non-contact atomic force microscopy (NC-AFM) [1][2][3] are powerful methods allowing the visualization of the atomic structure of a surface

Dispersion of single-wall carbon nanotubes with supramolecular Congo red – properties of the complexes and mechanism of the interaction

• Anna Jagusiak,
• Barbara Piekarska,
• Tomasz Pańczyk,
• Małgorzata Jemioła-Rzemińska,
• Elżbieta Bielańska,
• Barbara Stopa,
• Grzegorz Zemanek,
• Janina Rybarska,
• Irena Roterman and
• Leszek Konieczny

Beilstein J. Nanotechnol. 2017, 8, 636–648, doi:10.3762/bjnano.8.68

• . The nominal radius of the tip before the measurement was 2 nm. PeakForce QNM (PF QNM) performs a very fast curve at every pixel in the image. Using PF QNM mode visualization, maps of both the surface and mechanical properties were generated simultaneously. This allowed to obtain following

Physics, chemistry and biology of functional nanostructures III

• Anatolie S. Sidorenko

Beilstein J. Nanotechnol. 2017, 8, 590–591, doi:10.3762/bjnano.8.63

• tuberculosis bacilli [1], new applications of graphene-based nanostructures [2][3][4], smart nanoparticles with antitumor activity [5], photonic crystals and flexible membranes [6][7] for visualization devices and remote-readout strain gauges. A lot of other unusual applications of functional nanostructures

Self-assembly of silicon nanowires studied by advanced transmission electron microscopy

• Marta Agati,
• Guillaume Amiard,
• Vincent Le Borgne,
• Paola Castrucci,
• Richard Dolbec,
• Maurizio De Crescenzi,
• My Alì El Khakani and
• Simona Boninelli

Beilstein J. Nanotechnol. 2017, 8, 440–445, doi:10.3762/bjnano.8.47

• Visualiser Kai software was used for visualization. (a) Typical SEM image showing the morphology of the as-collected sample; EFTEM images obtained at (b) the Si plasmon loss (17 eV) and (c) the SiO2 plasmon loss (23 eV), revealing the Si–SiO2 core–shell structure and the structural continuity between the Si

Impact of contact resistance on the electrical properties of MoS₂ transistors at practical operating temperatures

• Filippo Giannazzo,
• Gabriele Fisichella,
• Aurora Piazza,
• Salvatore Di Franco,
• Giuseppe Greco,
• Simonpietro Agnello and
• Fabrizio Roccaforte

Beilstein J. Nanotechnol. 2017, 8, 254–263, doi:10.3762/bjnano.8.28

• are reported in Figure 2 both on a semilogarithmic scale (Figure 2a) and on a linear scale (Figure 2b). Clearly, the linear scale plot allows the current transport above the threshold voltage (Vth) to be studied, whereas the semilog scale plot allows for a better visualization of transport in the

Flexible photonic crystal membranes with nanoparticle high refractive index layers

• Torben Karrock,
• Moritz Paulsen and
• Martina Gerken

Beilstein J. Nanotechnol. 2017, 8, 203–209, doi:10.3762/bjnano.8.22

• nm, i.e., 3.9 nm per % strain. The color impression of the samples observed with crossed-polarization filters changes from the green to the red regime. The high tunability renders these membranes promising for both tunable optical devices as well as visualization devices. Keywords: fabrication

• resonance both with nanoparticle layer thickness and with strain. Due to the large possible deformations and color changes such photonic crystals membranes are highly promising for tunable devices as well as for visualization devices. Results and Discussion We observe resonances in the transmission spectrum

• withstand the strain above 15%. The large observed resonance shifts of ≈80 nm correspond to significant color shifts in the visual spectrum. In order to investigate the visualization aspect more closely, the measured spectra are converted to the standard CIE color system. Figure 4 shows the converted curves

Surface-enhanced Raman scattering of self-assembled thiol monolayers and supported lipid membranes on thin anodic porous alumina

• Marco Salerno,
• Amirreza Shayganpour,
• Barbara Salis and
• Silvia Dante

Beilstein J. Nanotechnol. 2017, 8, 74–81, doi:10.3762/bjnano.8.8

• SAMs, coupled according to the same thiol deposited on the different substrates of flat Au and tAPA–Au, are presented, for easier visualization of the substrate effect. It appears clearly that on tAPA–Au the major characteristic peaks of both MbA and AT are highly enhanced. Taking into account the

Grazing-incidence optical magnetic recording with super-resolution

• Gunther Scheunert,
• Sidney. R. Cohen,
• René Kullock,
• Ryan McCarron,
• Katya Rechev,
• Ifat Kaplan-Ashiri,
• Ora Bitton,
• Paul Dawson,
• Bert Hecht and
• Dan Oron

Beilstein J. Nanotechnol. 2017, 8, 28–37, doi:10.3762/bjnano.8.4

• amplitude) is presented here. A moving average was applied to all phase/amplitude profiles for better visualization of relevant features. Two different commercial PMR 2.5” HDDs were used for sampling: a Seagate 1 TB/3-platter drive (GoFlexTM series) and a Toshiba 120 GB/1-platter drive. In preparation of

Organoclay hybrid materials as precursors of porous ZnO/silica-clay heterostructures for photocatalytic applications

• Marwa Akkari,
• Pilar Aranda,
• Abdessalem Ben Haj Amara and
• Eduardo Ruiz-Hitzky

Beilstein J. Nanotechnol. 2016, 7, 1971–1982, doi:10.3762/bjnano.7.188

• visualization, the particle samples were adhered on a carbon tap for direct observation without applying any conductive coating on their surface. Solid-state 29Si MAS-NMR spectra were collected on a Bruker Avance 400 spectrometer operating at 79.49 MHz in samples spun at 10 kHz, using a single-pulse sequence of

Facile fabrication of luminescent organic dots by thermolysis of citric acid in urea melt, and their use for cell staining and polyelectrolyte microcapsule labelling

• Nadezhda M. Zholobak,
• Anton L. Popov,
• Alexander B. Shcherbakov,
• Nelly R. Popova,
• Mykhailo M. Guzyk,
• Valeriy P. Antonovich,
• Alla V. Yegorova,
• Yuliya V. Scrypynets,
• Inna I. Leonenko,
• Alexander Ye. Baranchikov and
• Vladimir K. Ivanov

Beilstein J. Nanotechnol. 2016, 7, 1905–1917, doi:10.3762/bjnano.7.182

• , and cellular luminescence was weak (Figure 5, top). Treatment with hydrogen peroxide (8 μg/mL, 15 min) initiated activation of oxidative stress in the cells; upon such treatment, the cells were stained more intensely (Figure 5, bottom). The use of O-dots allowed a clear visualization of the oxidative

• accumulate in the nucleoli of cells and perinuclear space, clearly separating the core-mantle boundary (Figure 5). Another advantage of the pre-fixation of cells is that, for the visualization of cell structures, a lower concentration of only about a third of O-dots is required. As in the case of intact

• traditional dyes) can be detected by using excitation light sources of different wavelengths. Thus, the standard optical setting for a luminescent microscope used in Rhodamine dye cell staining and visualization (ex. 546 nm/em. 575 nm) causes O-dots to emit in red (Figure 6A); the set used for DAPI staining

Effective intercalation of zein into Na-montmorillonite: role of the protein components and use of the developed biointerfaces

• Ana C. S. Alcântara,
• Margarita Darder,
• Pilar Aranda and
• Eduardo Ruiz-Hitzky

Beilstein J. Nanotechnol. 2016, 7, 1772–1782, doi:10.3762/bjnano.7.170

• separation in absolute ethanol, while the PCT phase was firstly solubilized in 80% (v/v) ethanol/water. The polyacrylamide gels at 20% were silver-stained for band visualization. Mechanical properties The mechanical properties, Young’s modulus (E) and elongation at break, of the bionanocomposite film samples

Thickness-modulated tungsten–carbon superconducting nanostructures grown by focused ion beam induced deposition for vortex pinning up to high magnetic fields

• Ismael García Serrano,
• Javier Sesé,
• Isabel Guillamón,
• Hermann Suderow,
• Sebastián Vieira,
• Manuel Ricardo Ibarra and
• José María De Teresa

Beilstein J. Nanotechnol. 2016, 7, 1698–1708, doi:10.3762/bjnano.7.162

• minimum of the resistance at ≈1.5 T to a possible reordering of the vortex lattice or the coexistence of both ordering modes at this magnetic field. Only direct visualization (by STM for example) of the vortex lattice could resolve in this case. After carrying out the assignment of all the experimental

Nanoanalytics for materials science

• Thilo Glatzel and
• Tom Wirtz

Beilstein J. Nanotechnol. 2016, 7, 1674–1675, doi:10.3762/bjnano.7.159

• and reliable understanding and accurate physical models. Furthermore, a reliable and easy way to extract a maximum of information out of the multimodal datasets, efficient data visualization strategies, and methods for analysis, mining and modeling are of utmost importance. This Thematic Series on

Sb₂S₃ grown by ultrasonic spray pyrolysis and its application in a hybrid solar cell

• Erki Kärber,
• Atanas Katerski,
• Ilona Oja Acik,
• Arvo Mere,
• Valdek Mikli and
• Malle Krunks

Beilstein J. Nanotechnol. 2016, 7, 1662–1673, doi:10.3762/bjnano.7.158

• accelerating voltage of 10 kV. The same SEM system was used for visualization of the morphology of the layers and of the cross-section of the solar cells at an electron beam accelerating voltage of 4 kV. Current–voltage scans of the solar cells were used to obtain the principal characteristics of the solar

False positives and false negatives measure less than 0.001% in labeling ssDNA with osmium tetroxide 2,2’-bipyridine

• Anastassia Kanavarioti

Beilstein J. Nanotechnol. 2016, 7, 1434–1446, doi:10.3762/bjnano.7.135

• , allowing the visualization of complete osmylation (plateau), as well as of any side reactions (additional peaks) that could be attributed to degradation products. Under these conditions, the reaction is quite fast and all pyrimidines have reacted after about 40 min, as evidenced by the plateau. Moreover

On the pathway of cellular uptake: new insight into the interaction between the cell membrane and very small nanoparticles

• Claudia Messerschmidt,
• Daniel Hofmann,
• Anja Kroeger,
• Katharina Landfester,
• Volker Mailänder and
• Ingo Lieberwirth

Beilstein J. Nanotechnol. 2016, 7, 1296–1311, doi:10.3762/bjnano.7.121

• identification Since the contrast of the silica particles in bright field imaging was too low for unambiguous identification, we applied inelastic dark field imaging techniques for the visualization of silica nanoparticles. Inelastic dark field imaging was conducted using the image filter/electron energy loss

Functional diversity of resilin in Arthropoda

• Jan Michels,
• Esther Appel and
• Stanislav N. Gorb

Beilstein J. Nanotechnol. 2016, 7, 1241–1259, doi:10.3762/bjnano.7.115

• solutions, the excitation maximum is shifted considerably to about 285 nm, and the upper edge of the excitation peak is at about 330–340 nm [38][39]. The pH-induced changes of the excitation properties are reversible and take place rapidly [40]. The described resilin identification and visualization methods

A terahertz-vibration to terahertz-radiation converter based on gold nanoobjects: a feasibility study

• Kamil Moldosanov and
• Andrei Postnikov

Beilstein J. Nanotechnol. 2016, 7, 983–989, doi:10.3762/bjnano.7.90

• sources is apparent in the areas of application such as early cancer diagnostics, nondestructive inspection of pharmaceutical tablets, visualization of concealed objects. We outline the operation principle and suggest the design of a simple appliance for generating terahertz radiation by a system of