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

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https://read.qxmd.com/read/30662321/particle-atomic-layer-deposition
#1
REVIEW
Alan W Weimer
The functionalization of fine primary particles by atomic layer deposition (particle ALD) provides for nearly perfect nanothick films to be deposited conformally on both external and internal particle surfaces, including nanoparticle surfaces. Film thickness is easily controlled from several angstroms to nanometers by the number of self-limiting surface reactions that are carried out sequentially. Films can be continuous or semi-continuous. This review starts with a short early history of particle ALD. The discussion includes agitated reactor processing, both atomic and molecular layer deposition (MLD), coating of both inorganic and polymer particles, nanoparticles, and nanotubes...
2019: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://read.qxmd.com/read/30636924/dielectric-and-magnetic-characteristics-of-ca-1-x-mn-x-moo-4-0-%C3%A2-x-%C3%A2-0-15-nanomaterials
#2
T Groń, M Karolewicz, E Tomaszewicz, M Guzik, M Oboz, B Sawicki, H Duda, Z Kukuła
Scheelite-type Ca1- x Mn x MoO4 ( x  = 0.0, 0.01, 0.05, 0.10 and 0.15) nanomaterials were successfully synthesized via a combustion route. Dielectric studies showed a weak n -type electrical conductivity characteristic for insulators and low relative permittivity ( ε r  < 15) decreasing with increasing Mn2+ content. CaMoO4 and Mn2+ -doped nanomaterials are chemically compatible with Al and Ag electrodes and promising for low-temperature co-fired ceramic applications. Magnetic studies showed, at room-temperature diamagnetism for pure CaMoO4 , the balance between diamagnetism and paramagnetism for Ca1- x Mn x MoO4 ( x  = 0...
2019: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://read.qxmd.com/read/30713467/functional-metabolite-assemblies-a-review
#3
Ruth Aizen, Kai Tao, Sigal Rencus-Lazar, Ehud Gazit
Metabolites are essential for the normal operation of cells and fulfill various physiological functions. It was recently found that in several metabolic disorders, the associated metabolites could self-assemble to generate amyloid-like structures, similar to canonical protein amyloids that have a role in neurodegenerative disorders. Yet, assemblies with typical amyloid characteristics are also known to have physiological function. In addition, many non-natural proteins and peptides presenting amyloidal properties have been used for the fabrication of functional nanomaterials...
May 2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://read.qxmd.com/read/30631247/a-survey-on-the-state-of-nanosafety-research-in-the-european-union-and-the-united-states
#4
Albert Duschl, Gabriele Windgasse
Researchers in the field of environmental safety and health of nanomaterials (nanosafety) were surveyed between September 2017 and January 2018 to obtain a snapshot on the state of investigations in this field. The data received from 84 respondents give information on exposure pathways, methods, biologic and toxic effects, dose metrics and range, criteria for selecting benchmark materials, and on problems that are considered urgent in the field. The results can help guide research strategies and funding schemes related to nanosafety of nanoparticles...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://read.qxmd.com/read/30595660/measuring-nanoparticles-in-the-size-range-to-2000-nm
#5
Philip J Wyatt
Measurement of light scattered from suspensions of monodisperse nanoparticles in solution ("turbidity") long has been used to derive their size. Following some means of fractionation, the light (monochromatic) scattered by the particles into a set of distinct angles is collected and a non-linear least squares fit was made to an appropriate theory in order to extract their size. For a wide range of particle structures, where this process becomes very complex and of questionable validity, there is a far simpler interpretive means based upon measurements at extremely small, and often inaccessible, scattering angles...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://read.qxmd.com/read/30524192/gqds-msns-nanocomposite-nanoparticles-for-simultaneous-intracellular-drug-delivery-and-fluorescent-imaging
#6
Dorota Flak, Łucja Przysiecka, Grzegorz Nowaczyk, Błażej Scheibe, Mikołaj Kościński, Teofil Jesionowski, Stefan Jurga
Although number of stimuli-responsive drug delivery systems based on mesoporous silica nanoparticles (MSNs) have been developed, the simultaneous real-time monitoring of carrier in order to guarantee proper drug targeting still remains as a challenge. GQDs-MSNs nanocomposite nanoparticles composed of graphene quantum dots (GQDs) and MSNs are proposed as efficient doxorubicin delivery and fluorescent imaging agent, allowing to monitor intracellular localization of a carrier and drug diffusion route from the carrier...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://read.qxmd.com/read/30524191/influence-of-size-and-surface-capping-on-photoluminescence-and-cytotoxicity-of-gold-nanoparticles
#7
Cecilia Fernández-Ponce, Juan P Muñoz-Miranda, Desiré M de Los Santos, Enrique Aguado, Francisco García-Cozar, Rocío Litrán
Hydrophilic and homogeneous sub-10 nm blue light-emitting gold nanoparticles (NPs) functionalized with different capping agents have been prepared by simple chemical routes. Structure, average, size, and surface characteristics of these NPs have been widely studied, and the stability of colloidal NP solutions at different pH values has been evaluated. Au NPs show blue PL emission, particularly in the GSH capped NPs, in which the thiol-metal core transference transitions considerably enhance the fluorescent emission...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://read.qxmd.com/read/30524190/aptamer-conjugated-multi-walled-carbon-nanotubes-as-a-new-targeted-ultrasound-contrast-agent-for-the-diagnosis-of-prostate-cancer
#8
Fenfen Gu, Chuling Hu, Qingming Xia, Chunai Gong, Shen Gao, Zhongjian Chen
Early diagnosis is primarily important for the therapeutic and prognostic outcomes of malignancies including prostate cancer (PCa). However, the visuality and veracity of ultrasound imaging for the diagnosis and prognostic prediction of PCa remains poor at present. In this study, we developed a new nanoultrasound contrast agent by modifying multi-walled carbon nanotubes (MWCNTs) with polyethylene glycol (PEG) and anti-PSMA aptamer. The result showed that the modified MWCNTs offered better visuality and veracity and were able to target PCa cells more effectively as compared with the traditional contrast agent...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://read.qxmd.com/read/30363718/expanding-the-limits-of-synthetic-macromolecular-chemistry-through-polyphenylene-dendrimers
#9
Brenton A G Hammer, Klaus Müllen
Polyphenylene dendrimers (PPDs) are a unique class of macromolecules because their backbone is made from twisted benzene repeat units that result in a rigid, shape-persistent architecture as reported by Hammer et al. (Chem Soc Rev 44:4072-4090, 2015) and Hammer and Müllen (Chem Rev 116:2103-210, 2016) These dendrimers can be synthetically tailored at their core, scaffold, and surface to introduce a wide range of chemical functionalities that influence their applications. It is the balance between the macromolecular properties of polyphenylene dendrimers with grandiose synthetic ingenuity that presents a template for the next generation of synthetic dendrimers to achieve complex structures other chemistry fields cannot...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://read.qxmd.com/read/30237749/green-method-for-efficient-pdnps-deposition-on-carbon-carrier-in-the-microreactor-system
#10
Magdalena Luty-Błocho, Marek Wojnicki, Grzegorz Włoch, Krzysztof Fitzner
The synthesis of palladium nanoparticles and conditions of their deposition on active carbon fibers in the microreactor was described. All processes related with metal ion reduction, nucleation, and autocatalytic growth of particles as well as their deposition were carried out in the microreactor in only one cycle. Synthesis of palladium nanoparticles was carried out under different conditions, i.e., changing the initial concentration of metal ions and the reductant, at 40 °C. Depending on the conditions imposed, the nanoparticles of different size (hydrodynamic radius change from 12 to 37 nm) and shape (spherical, cube, pyramid) were obtained...
2018: Journal of Nanoparticle Research: An Interdisciplinary Forum for Nanoscale Science and Technology
https://read.qxmd.com/read/30147435/a-method-to-improve-the-quality-of-silica-nanoparticles-snps-over-increasing-storage-durations
#11
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://read.qxmd.com/read/29962901/continuous-dry-dispersion-of-multi-walled-carbon-nanotubes-to-aerosols-with-high-concentrations-of-individual-fibers
#12
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://read.qxmd.com/read/29950922/nanoparticle-transport-pathways-into-tumors
#13
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://read.qxmd.com/read/29950921/dna-nanostructure-directed-assembly-of-metal-nanoparticle-superlattices
#14
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://read.qxmd.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
#15
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://read.qxmd.com/read/29780275/synthesis-characterization-and-interactions-of-single-walled-carbon-nanotubes-modified-with-doxorubicin-with-langmuir-blodgett-biomimetic-membranes
#16
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://read.qxmd.com/read/29720891/ultra-small-dye-doped-silica-nanoparticles-via-modified-sol-gel-technique
#17
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://read.qxmd.com/read/29576738/functionalized-tio-2-nanoparticles-labelled-with-225-ac-for-targeted-alpha-radionuclide-therapy
#18
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://read.qxmd.com/read/29527123/can-disc-diffusion-susceptibility-tests-assess-the-antimicrobial-activity-of-engineered-nanoparticles
#19
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://read.qxmd.com/read/29497347/particle-release-and-control-of-worker-exposure-during-laboratory-scale-synthesis-handling-and-simulated-spills-of-manufactured-nanomaterials-in-fume-hoods
#20
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
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