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Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology

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https://www.readbyqxmd.com/read/30147435/a-method-to-improve-the-quality-of-silica-nanoparticles-snps-over-increasing-storage-durations
#1
Zihan Lu, Huw Owens
The solvent varying technique (SVT) provides a simple method for the production of uniform batches of silica nanoparticles (SNPs) of a target average diameter. SNPs synthesized using the SVT have been observed to agglomerate over increasing storage times leading to an increase in average particle diameter. Since the particle diameters of the SNPs produced using the SVT may vary over increasing storage durations, the previous model, suggested by Gao et al., which is based on the diameter of the original SNPs, is unreliable when predicting a target particle diameter using the initial volume of ethanol...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29962901/continuous-dry-dispersion-of-multi-walled-carbon-nanotubes-to-aerosols-with-high-concentrations-of-individual-fibers
#2
Barbara Katrin Simonow, Daniela Wenzlaff, Asmus Meyer-Plath, Nico Dziurowitz, Carmen Thim, Jana Thiel, Mikolaj Jandy, Sabine Plitzko
The assessment of the toxicity of airborne nanofibers is an important task. It relies on toxicological inhalation studies and validated exposure measurement techniques. Both require nanofiber-containing aerosols of known morphological composition and controlled fraction of individual fibers. Here, a dry powder dispersion method is presented that operates with mixtures of nanofibers and microscale beads. Aerosolization experiments of mixtures of multi-walled carbon nanotubes (MWCNTs) and glass beads that were continuously fed into a Venturi nozzle enabled high generation rates of aerosols composed of individual and agglomerate nanofiber structures...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29950922/nanoparticle-transport-pathways-into-tumors
#3
S M Moghimi, D Simberg
Two transport pathways (interendothelial and transendothelial routes) have long been proposed for entry of nanoparticles from the blood circulation into solid tumors. We examine and discuss available evidence supporting interendothelial and transendothelial transport processes and suggest new avenues for re-evaluating these pathways. Understanding of integrative mechanisms controlling nanoparticle extravasation into tumors is important for improving engineering and performance of anti-cancer nanopharmaceuticals...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29950921/dna-nanostructure-directed-assembly-of-metal-nanoparticle-superlattices
#4
REVIEW
Sofia Julin, Sami Nummelin, Mauri A Kostiainen, Veikko Linko
Structural DNA nanotechnology provides unique, well-controlled, versatile, and highly addressable motifs and templates for assembling materials at the nanoscale. These methods to build from the bottom-up using DNA as a construction material are based on programmable and fully predictable Watson-Crick base pairing. Researchers have adopted these techniques to an increasing extent for creating numerous DNA nanostructures for a variety of uses ranging from nanoelectronics to drug-delivery applications. Recently, an increasing effort has been put into attaching nanoparticles (the size range of 1-20 nm) to the accurate DNA motifs and into creating metallic nanostructures (typically 20-100 nm) using designer DNA nanoshapes as molds or stencils...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29780276/design-and-assembly-of-ternary-pt-re-sno-2-nps-by-controlling-the-zeta-potential-of-individual-pt-re-and-sno-2-nps
#5
Elżbieta Drzymała, Grzegorz Gruzeł, Anna Pajor-Świerzy, Joanna Depciuch, Robert Socha, Andrzej Kowal, Piotr Warszyński, Magdalena Parlinska-Wojtan
In this study Pt, Re, and SnO2 nanoparticles (NPs) were combined in a controlled manner into binary and ternary combinations for a possible application for ethanol oxidation. For this purpose, zeta potentials as a function of the pH of the individual NPs solutions were measured. In order to successfully combine the NPs into Pt/SnO2 and Re/SnO2 NPs, the solutions were mixed together at a pH guaranteeing opposite zeta potentials of the metal and oxide NPs. The individually synthesized NPs and their binary/ternary combinations were characterized by Fourier transform infrared spectroscopy (FTIR) and scanning transmission electron microscopy (STEM) combined with energy dispersive X-ray spectroscopy (EDS) analysis...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29780275/synthesis-characterization-and-interactions-of-single-walled-carbon-nanotubes-modified-with-doxorubicin-with-langmuir-blodgett-biomimetic-membranes
#6
Dorota Matyszewska, Ewelina Napora, Kamila Żelechowska, Jan F Biernat, Renata Bilewicz
The synthesis, characterization, and the influence of single-walled carbon nanotubes (SWCNTs) modified with an anticancer drug doxorubicin (DOx) on the properties of model biological membrane as well as the comparison of the two modes of modification has been presented. The drug was covalently attached to the nanotubes either preferentially on the sides or at the ends of the nanotubes by the formation of hydrazone bond. The efficiency of the modification was proved by the results of FTIR, Raman, and thermogravimetric analysis...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29720891/ultra-small-dye-doped-silica-nanoparticles-via-modified-sol-gel-technique
#7
R Riccò, S Nizzero, E Penna, A Meneghello, E Cretaio, F Enrichi
In modern biosensing and imaging, fluorescence-based methods constitute the most diffused approach to achieve optimal detection of analytes, both in solution and on the single-particle level. Despite the huge progresses made in recent decades in the development of plasmonic biosensors and label-free sensing techniques, fluorescent molecules remain the most commonly used contrast agents to date for commercial imaging and detection methods. However, they exhibit low stability, can be difficult to functionalise, and often result in a low signal-to-noise ratio...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29576738/functionalized-tio-2-nanoparticles-labelled-with-225-ac-for-targeted-alpha-radionuclide-therapy
#8
Edyta Cędrowska, Marek Pruszynski, Agnieszka Majkowska-Pilip, Sylwia Męczyńska-Wielgosz, Frank Bruchertseifer, Alfred Morgenstern, Aleksander Bilewicz
The 225 Ac radioisotope exhibits very attractive nuclear properties for application in radionuclide therapy. Unfortunately, the major challenge for radioconjugates labelled with 225 Ac is that traditional chelating moieties are unable to sequester the radioactive daughters in the bioconjugate which is critical to minimize toxicity to healthy, non-targeted tissues. In the present work, we propose to apply TiO2 nanoparticles (NPs) as carrier for 225 Ac and its decay products. The surface of TiO2 nanoparticles with 25 nm diameter was modified with Substance P (5-11), a peptide fragment which targets NK1 receptors on the glioma cells, through the silan-PEG-NHS linker...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29527123/can-disc-diffusion-susceptibility-tests-assess-the-antimicrobial-activity-of-engineered-nanoparticles
#9
Angeliki Kourmouli, Marco Valenti, Erwin van Rijn, Hubertus J E Beaumont, Olga-Ioanna Kalantzi, Andreas Schmidt-Ott, George Biskos
The use of disc diffusion susceptibility tests to determine the antibacterial activity of engineered nanoparticles (ENPs) is questionable because their low diffusivity practically prevents them from penetrating through the culture media. In this study, we investigate the ability of such a test, namely the Kirby-Bauer disc diffusion test, to determine the antimicrobial activity of Au and Ag ENPs having diameters from 10 to 40 nm on Escherichia coli cultures. As anticipated, the tests did not show any antibacterial effects of Au nanoparticles (NPs) as a result of their negligible diffusivity through the culture media...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29497347/particle-release-and-control-of-worker-exposure-during-laboratory-scale-synthesis-handling-and-simulated-spills-of-manufactured-nanomaterials-in-fume-hoods
#10
Ana S Fonseca, Eelco Kuijpers, Kirsten I Kling, Marcus Levin, Antti J Koivisto, Signe H Nielsen, W Fransman, Yijri Fedutik, Keld A Jensen, Ismo K Koponen
Fume hoods are one of the most common types of equipment applied to reduce the potential of particle exposure in laboratory environments. A number of previous studies have shown particle release during work with nanomaterials under fume hoods. Here, we assessed laboratory workers' inhalation exposure during synthesis and handling of CuO, TiO2 and ZnO in a fume hood. In addition, we tested the capacity of a fume hood to prevent particle release to laboratory air during simulated spillage of different powders (silica fume, zirconia TZ-3Y and TiO2 )...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29056867/particle-emissions-from-laboratory-activities-involving-carbon-nanotubes
#11
Li-Ming Lo, Candace S-J Tsai, William A Heitbrink, Kevin H Dunn, Jennifer Topmiller, Michael Ellenbecker
This site study was conducted in a chemical laboratory to evaluate nanomaterial emissions from 20-30 nm diameter bundles of single-walled carbon nanotubes (CNTs) during product development activities. Direct-reading instruments were used to monitor the tasks in real time and airborne particles were collected using various methods to characterize released nanomaterials using electron microscopy and elemental carbon (EC) analyses. CNT clusters and a few high aspect ratio particles were identified as being released from some activities...
August 2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29249900/effect-of-interaction-of-external-surfaces-on-the-symmetry-and-lattice-distortion-of-cdse-nanocrystals-by-molecular-dynamics-simulations
#12
S Stelmakh, K Skrobas, S Gierlotka, B Palosz
The effect of interaction of low-index atomic planes, (100), (110), and (111) terminating CdSe platelet nanocrystals is examined using molecular dynamics (MD) simulations. Asymmetry of the environment of atoms at the end surface layers leads to anisotropic deformation of the cubic lattice and to a relative shift of Cd and Se sub-lattices. Interference of distortions of the crystal lattice originating at the terminal surfaces leads to changes of symmetry of the CdSe lattice in the whole sample volume. In the models, 2-3 nm thick, for all types of surfaces under examination, the initial cubic lattice symmetry gets lost in the whole sample volume...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29046611/variation-in-chemical-colloidal-and-electrochemical-properties-of-carbon-nanotubes-with-the-degree-of-carboxylation
#13
Zheqiong Wu, Zhiqian Wang, Fang Yu, Megha Thakkar, Somenath Mitra
Multiwalled carbon nanotubes (CNTs) were carboxylated via microwave irradiation where the treatment time was varied to alter the degree of functionalization, and as many as one in 15 carbons in the CNT could be oxidized. Chemical, physical, electrochemical, and colloidal behavior of the carboxylated CNTs was studied. All properties changed with the degree of functionalization to a point beyond which they appeared to remain constant. The surface area increased from 173.9 to 270.9 m2 /g while the critical coagulation concentration (CCC) values increased from 142...
January 2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/29026343/photothermal-stability-of-biologically-and-chemically-synthesized-gold-nanoprisms
#14
Magdalena Klekotko, Joanna Olesiak-Banska, Katarzyna Matczyszyn
We report here the influence of the irradiation with femtosecond laser pulses on the gold nanoprisms synthesized using biological and chemical methods. For the bio-mediated growth, we used plant extract as a source of reducing, structure-directing, and stabilizing agents, while for the chemical method, we applied three-step protocol, involving chemicals commonly used in the synthesis of nanostructures. Exposition of the nanostructures to the laser beam causes morphological changes, which affect their extinction spectra...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/28979180/the-effect-of-different-workplace-nanoparticles-on-the-immune-systems-of-employees
#15
Natalja Kurjane, Tija Zvagule, Jelena Reste, Zanna Martinsone, Ilona Pavlovska, Inese Martinsone, Ivars Vanadzins
Currently, nanoparticles are widely present in the environment and are being used in various industrial technologies. Nanoparticles affect immune functions, causing different immune responses. The aim of the current study was to evaluate several cytokines, interleukin (IL)-1b, IL-6, IL-8, tumour necrosis factor-a (TNF-α), interferon-γ, adhesive molecule sICAM-1, macrophage inhibitory protein 1a (MIP1a) and secretory immunoglobulin A, in nasal lavage fluid and in the peripheral blood of healthy subjects exposed to workplace nanoparticles...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/28959137/influence-of-shear-stress-and-size-on-viability-of-endothelial-cells-exposed-to-gold-nanoparticles
#16
C Fede, Giovanna Albertin, L Petrelli, R De Caro, I Fortunati, V Weber, Camilla Ferrante
Screening nanoparticle toxicity directly on cell culture can be a fast and cheap technique. Nevertheless, to obtain results in accordance with those observed in live animals, the conditions in which cells are cultivated should resemble the one encountered in live systems. Microfluidic devices offer the possibility to satisfy this requirement, in particular with endothelial cell lines, because they are capable to reproduce the flowing media and shear stress experienced by these cell lines in vivo. In this work, we exploit a microfluidic device to observe how human umbilical vein endothelial cells (HUVEC) viability changes when subject to a continuous flow of culture medium, in which spherical citrate-stabilized gold nanoparticles of different sizes and at varying doses are investigated...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/28932168/the-structural-coloration-of-textile-materials-using-self-assembled-silica-nanoparticles
#17
Weihong Gao, Muriel Rigout, Huw Owens
The work presented investigates how to produce structural colours on textile materials by applying a surface coating of silica nanoparticles (SNPs). Uniform SNPs with particle diameters in a controlled micron size range (207-350 nm) were synthesized using a Stöber-based solvent varying (SV) method which has been reported previously. Photonic crystals (PCs) were formed on the surface of a piece of textile fabric through a process of natural sedimentation self-assembly of the colloidal suspension containing uniform SNPs...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/28824289/effects-of-surface-functionalization-of-hydrophilic-nayf4-nanocrystals-doped-with-eu-3-on-glutamate-and-gaba-transport-in-brain-synaptosomes
#18
Bartlomiej Sojka, Daria Kociołek, Mateusz Banski, Tatiana Borisova, Natalia Pozdnyakova, Artem Pastukhov, Arsenii Borysov, Marina Dudarenko, Artur Podhorodecki
Specific rare earth doped nanocrystals (NCs), a recent class of nanoparticles with fluorescent features, have great bioanalytical potential. Neuroactive properties of NaYF4 nanocrystals doped with Eu(3+) were assessed based on the analysis of their effects on glutamate- and γ-aminobutyric acid (GABA) transport process in nerve terminals isolated from rat brain (synaptosomes). Two types of hydrophilic NCs were examined in this work: (i) coated by polyethylene glycol (PEG) and (ii) with OH groups at the surface...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/28824288/the-role-of-tannic-acid-and-sodium-citrate-in-the-synthesis-of-silver-nanoparticles
#19
Katarzyna Ranoszek-Soliwoda, Emilia Tomaszewska, Ewelina Socha, Pawel Krzyczmonik, Anna Ignaczak, Piotr Orlowski, Małgorzata Krzyzowska, Grzegorz Celichowski, Jaroslaw Grobelny
We describe herein the significance of a sodium citrate and tannic acid mixture in the synthesis of spherical silver nanoparticles (AgNPs). Monodisperse AgNPs were synthesized via reduction of silver nitrate using a mixture of two chemical agents: sodium citrate and tannic acid. The shape, size and size distribution of silver particles were determined by UV-Vis spectroscopy, dynamic light scattering (DLS) and scanning transmission electron microscopy (STEM). Special attention is given to understanding and experimentally confirming the exact role of the reagents (sodium citrate and tannic acid present in the reaction mixture) in AgNP synthesis...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://www.readbyqxmd.com/read/28824287/validation-of-a-particle-tracking-analysis-method-for-the-size-determination-of-nano-and-microparticles
#20
Vikram Kestens, Vassili Bozatzidis, Pieter-Jan De Temmerman, Yannic Ramaye, Gert Roebben
Particle tracking analysis (PTA) is an emerging technique suitable for size analysis of particles with external dimensions in the nano- and sub-micrometre scale range. Only limited attempts have so far been made to investigate and quantify the performance of the PTA method for particle size analysis. This article presents the results of a validation study during which selected colloidal silica and polystyrene latex reference materials with particle sizes in the range of 20 nm to 200 nm were analysed with NS500 and LM10-HSBF NanoSight instruments and video analysis software NTA 2...
2017: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
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