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https://www.readbyqxmd.com/read/28343128/peroxy-titanium-complex-based-inks-for-low-temperature-compliant-anatase-thin-films
#1
N S Shabanov, A Sh Asvarov, A Chiolerio, K Sh Rabadanov, A B Isaev, F F Orudzhev, S Sh Makhmudov
Stable highly crystalline titanium dioxide colloids are of paramount importance for the establishment of a solution-processable library of materials that could help in bringing the advantages of digital printing to the world of photocatalysis and solar energy conversion. Nano-sized titanium dioxide in the anatase phase was synthesized by means of hydrothermal methods and treated with hydrogen peroxide to form Peroxy-Titanium Complexes (PTCs). The influence of hydrogen peroxide on the structural, optical and rheological properties of titanium dioxide and its colloidal solutions were assessed and a practical demonstration of a low temperature compliant digitally printed anatase thin film given...
March 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28342757/role-of-enzymatic-free-radical-scavengers-in-management-of-oxidative-stress-and-autoimmune-disorders
#2
REVIEW
Shikha Srivastava, Deependra Singh, Satish Patel, Manju R Singh
Autoimmune disorders are distinct with over production and accumulation of free radicals due to its undisclosed genesis. The cause of numerous disorders as cancer, arthritis, psoriasis, diabetes, alzheimer's, cardiovascular disease, Parkinson's, respiratory distress syndrome, colitis, crohn's, pulmonary fibrosis, obesity and ageing have been associated with immune dysfunction and oxidative stress. In an oxidative stress, reactive oxygen species generally provoke the series of oxidation at cellular level. The buildup of free radicals in turn triggers various inflammatory cells causing release of various inflammatory interleukins, cytokines, chemokines, and tumor necrosis factors which mediate signal transduction and transcription pathways as nuclear factor- kappa B (NF-κB), signal transducer and activator of transcription 3 (STAT3), hypoxia-inducible factor-1 (HIF-1α) and nuclear factor-erythroid 2-related factor (Nrf2)...
March 22, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28339235/cross-interaction-drives-stratification-in-drying-film-of-binary-colloidal-mixtures
#3
Jiajia Zhou, Ying Jiang, Masao Doi
When a liquid film of a colloidal solution consisting of particles of different sizes is dried on a substrate, the colloids often stratify, where smaller colloids are laid upon larger colloids. This phenomenon is counterintuitive because larger colloids which have a smaller diffusion constant, are expected to remain near the surface during the drying process, leaving a layer of larger colloids on top of smaller colloids. Here we show that the phenomenon is caused by the interaction between the colloids, and can be explained by a diffusion model accounting for the interaction between the colloids...
March 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28339208/doubly-resonant-photonic-antenna-for-single-infrared-quantum-dot-imaging-at-telecommunication-wavelengths
#4
Zhihua Xie, Yannick Lefier, Miguel Angel Suarez, Mathieu Mivelle, Roland Salut, Jean-Marc Merolla, Thierry Grosjean
Colloidal quantum dots (CQDs) have drawn strong interest in the past for their high prospects in scientific, medical, and industrial applications. However, the full characterization of these quantum emitters is currently restricted to the visible wavelengths, and it remains a key challenge to optically probe single CQDs operating in the infrared spectral domain, which is targeted by a growing number of applications. Here, we report the first experimental detection and imaging at room temperature of single infrared CQDs operating at telecommunication wavelengths...
March 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28338312/engineering-nanoscale-iron-oxides-for-uranyl-sorption-and-separation-optimization-of-particle-core-size-and-bilayer-surface-coatings
#5
Wenlu Li, Lyndsay D Troyer, Seung Soo Lee, Jiewei Wu, Changwoo Kim, Brandon J Lafferty, Jeffrey G Catalano, John D Fortner
Herein, we describe engineered superparamagnetic iron oxide nanoparticles (IONPs) as platform materials for enhanced uranyl (UO22+) sorption and separation processes under environmentally relevant conditions. Specifically, monodispersed 8-25 nm iron oxide (magnetite, Fe3O4) nanoparticles with tailored organic acid bilayered coatings have been systematically evaluated and optimized to bind, and thus remove, uranium, from water. The combined non-hydrolytic synthesis and bilayer phase transfer material preparation methods yield highly uniform and surface tailorable IONPs, which allow us to directly evaluate the size-dependent and coating-dependent sorption capacities of IONPs...
March 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28338147/symmetry-breaking-during-nanocrystal-growth
#6
Kyle D Gilroy, Hsin-Chieh Peng, Xuan Yang, Aleksey Ruditskiy, Younan Xia
Symmetry breaking is a ubiquitous phenomenon that occurs spontaneously when a system is subjected to changes in size and/or variations in terms of thermodynamic parameters. As a stochastic process, even small fluctuations acting on a system can arbitrarily push it down one of the branches of a bifurcation. In this feature article, we use nanocrystal growth to illustrate the concept of symmetry breaking. Our aim is to convey its importance from a mechanistic perspective, by which one can rationally alter the experimental conditions to manipulate the growth pattern (symmetric vs...
March 24, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28337981/field-emission-from-quantum-dot-in-perovskite-solids
#7
F Pelayo García de Arquer, Xiwen Gong, Randy P Sabatini, Min Liu, Gi-Hwan Kim, Brandon R Sutherland, Oleksandr Voznyy, Jixian Xu, Yuangjie Pang, Sjoerd Hoogland, David Sinton, Edward Sargent
Quantum dot and well architectures are attractive for infrared optoelectronics, and have led to the realization of compelling light sensors. However, they require well-defined passivated interfaces and rapid charge transport, and this has restricted their efficient implementation to costly vacuum-epitaxially grown semiconductors. Here we report solution-processed, sensitive infrared field-emission photodetectors. Using quantum-dots-in-perovskite, we demonstrate the extraction of photocarriers via field emission, followed by the recirculation of photogenerated carriers...
March 24, 2017: Nature Communications
https://www.readbyqxmd.com/read/28336892/effect-of-the-polymeric-stabilizer-in-the-aqueous-phase-fischer-tropsch-synthesis-catalyzed-by-colloidal-cobalt-nanocatalysts
#8
Jorge A Delgado, Carmen Claver, Sergio Castillón, Daniel Curulla-Ferré, Cyril Godard
A series of small and well defined cobalt nanoparticles were synthesized by the chemical reduction of cobalt salts in water using NaBH4 as a reducing agent and using various polymeric stabilizers. The obtained nanocatalysts of similar mean diameters (ca. 2.6 nm) were fully characterized and tested in the aqueous phase Fischer-Tropsch Synthesis (AFTS). Interestingly, the nature and structure of the stabilizers used during the synthesis of the CoNPs affected the reduction degree of cobalt and the B-doping of these NPs and consequently, influenced the performance of these nanocatalysts in AFTS...
March 6, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336867/synthesis-of-multicolor-core-shell-naluf%C3%A2-yb-3-ln-3-caf%C3%A2-upconversion-nanocrystals
#9
Hui Li, Shuwei Hao, Chunhui Yang, Guanying Chen
The ability to synthesize high-quality hierarchical core/shell nanocrystals from an efficient host lattice is important to realize efficacious photon upconversion for applications ranging from bioimaging to solar cells. Here, we describe a strategy to fabricate multicolor core @ shell α-NaLuF₄:Yb(3+)/Ln(3+)@CaF₂ (Ln = Er, Ho, Tm) upconversion nanocrystals (UCNCs) based on the newly established host lattice of sodium lutetium fluoride (NaLuF₄). We exploited the liquid-solid-solution method to synthesize the NaLuF₄ core of pure cubic phase and the thermal decomposition approach to expitaxially grow the calcium fluoride (CaF₂) shell onto the core UCNCs, yielding cubic core/shell nanocrystals with a size of 15...
February 7, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336863/a-high-power-frequency-tunable-colloidal-quantum-dot-cdse-zns-laser
#10
Saradh Prasad, Hanan Saleh AlHesseny, Mohamad S AlSalhi, Durairaj Devaraj, Vadivel Masilamai
Tunable lasers are essential for medical, engineering and basic science research studies. Most conventional solid-state lasers are capable of producing a few million laser shots, but limited to specific wavelengths, which are bulky and very expensive. Dye lasers are continuously tunable, but exhibit very poor chemical stability. As new tunable, efficient lasers are always in demand, one such laser is designed with various sized CdSe/ZnS quantum dots. They were used as a colloid in tetrahydrofuran to produce a fluorescent broadband emission from 520 nm to 630 nm...
January 30, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336840/spectroscopic-characterization-of-copper-chitosan-nanoantimicrobials-prepared-by-laser-ablation-synthesis-in-aqueous-solutions
#11
Maria Chiara Sportelli, Annalisa Volpe, Rosaria Anna Picca, Adriana Trapani, Claudio Palazzo, Antonio Ancona, Pietro Mario Lugarà, Giuseppe Trapani, Nicola Cioffi
Copper-chitosan (Cu-CS) nanoantimicrobials are a novel class of bioactive agents, providing enhanced and synergistic efficiency in the prevention of biocontamination in several application fields, from food packaging to biomedical. Femtosecond laser pulses were here exploited to disrupt a Cu solid target immersed into aqueous acidic solutions containing different CS concentrations. After preparation, Cu-CS colloids were obtained by tuning both Cu/CS molar ratios and laser operating conditions. As prepared Cu-CS colloids were characterized by Fourier transform infrared spectroscopy (FTIR), to study copper complexation with the biopolymer...
December 30, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28336835/improving-powder-magnetic-core-properties-via-application-of-thin-insulating-silica-nanosheet-layers-on-iron-powder-particles
#12
Toshitaka Ishizaki, Hideyuki Nakano, Shin Tajima, Naoko Takahashi
A thin, insulating layer with high electrical resistivity is vital to achieving high performance of powder magnetic cores. Using layer-by-layer deposition of silica nanosheets or colloidal silica over insulating layers composed of strontium phosphate and boron oxide, we succeeded in fabricating insulating layers with high electrical resistivity on iron powder particles, which were subsequently used to prepare toroidal cores. The compact density of these cores decreased after coating with colloidal silica due to the substantial increase in the volume, causing the magnetic flux density to deteriorate...
December 23, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335985/aqueous-phase-synthesis-of-iron-oxide-nanoparticles-and-composites-for-cancer-diagnosis-and-therapy
#13
REVIEW
Jingchao Li, Shige Wang, Xiangyang Shi, Mingwu Shen
The design and development of multifunctional nanoplatforms for biomedical applications still remains to be challenging. This review reports the recent advances in aqueous-phase synthesis of iron oxide nanoparticles (Fe3O4 NPs) and their composites for magnetic resonance (MR) imaging and photothermal therapy of cancer. Water dispersible and colloidally stable Fe3O4 NPs synthesized via controlled coprecipitation route, hydrothermal route and mild reduction route are introduced. Some of key strategies to improve the r2 relaxivity of Fe3O4 NPs and to enhance their uptake by cancer cells are discussed in detail...
March 14, 2017: Advances in Colloid and Interface Science
https://www.readbyqxmd.com/read/28335973/papain-functionalized-gold-nanoparticles-as-heterogeneous-biocatalyst-for-bioanalysis-and-biopharmaceuticals-analysis
#14
Siyao Liu, Markus Höldrich, Adrian Sievers-Engler, Jeannie Horak, Michael Lämmerhofer
Surface-modified gold nanoparticles (GNPs) were synthesized via layer-by-layer process with alternating cationic polyallylamine and anionic poly(acrylic acid) polyelectrolyte layers leading to a highly hydrophilic biocompatible shell supporting colloidal stability. Afterwards, papain was covalently immobilized on the modified GNPs via amide coupling between the amino groups on papain and the terminal carboxylic groups of the modified GNPs by using N-(3-dimethylaminopropyl)-N'-ethylcarbodiimide and N-hydroxysulfosuccinimide sodium as coupling agents...
April 22, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28335696/development-and-initial-evaluation-of-a-lateral-flow-dipstick-test-for-antigen-detection-of-entamoeba-histolytica-in-stool-sample
#15
Syazwan Saidin, Muhammad Hafiznur Yunus, Nurulhasanah Othman, Yvonne Ai-Lian Lim, Zeehaida Mohamed, Nik Zairi Zakaria, Rahmah Noordin
Entamoeba histolytica infection remains a public health concern in developing countries. Early diagnosis of amoebiasis can avoid disease complications, thus this study was aimed at developing a test that can rapidly detect the parasite antigens in stool samples. Rabbits were individually immunized with recombinant pyruvate phosphate dikinase (rPPDK) and E. histolytica excretory-secretory antigens to produce polyclonal antibodies. A rapid dipstick test was produced using anti-rPPDK PAb lined on the dipstick as capture reagent and anti-EhESA PAb conjugated to colloidal gold as the detector reagent...
March 24, 2017: Pathogens and Global Health
https://www.readbyqxmd.com/read/28335595/ligand-exchange-dynamics-on-gold-nanocrystals-direct-monitoring-of-nanoscale-polyvinylpyrrolidone-thiol-domain-surface-morphology
#16
Shuaidi Zhang, Sunghan Kim, Vladimir V Tsukruk
We report direct high-resolution monitoring of an evolving mixed nanodomain surface morphology during thiol adsorption on polyvinylpyrrolidone (PVP)-stabilized single crystal gold nanocrystals. The thiol adsorption and replacement dynamics are found to be much more complex than a simple complete substitution of the initial polymer ligand. We observed that during ligand exchange with linear thiol, the nanocrystal surface evolved from an initial 1 nm uniform PVP coating into a remarkably stable network of globular PVP domains 20-100 nm in size and ~4 nm in height surrounded by thiol self-assembled monolayers (SAMs)...
March 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28335336/oral-toxicity-and-intestinal-transport-mechanism-of-colloidal-gold-nanoparticle-treated-red-ginseng
#17
Song-Hwa Bae, Jin Yu, Mi-Ran Go, Hyun-Jin Kim, Yun-Gu Hwang, Soo-Jin Choi
(1) Background: Application of nanotechnology or nanomaterials in agricultural food crops has attracted increasing attention with regard to improving crop production, quality, and nutrient utilization. Gold nanoparticles (Au-NPs) have been reported to enhance seed yield, germination rate, and anti-oxidant potential in food crops, raising concerns about their toxicity potential. In this study, we evaluated the oral toxicity of red ginseng exposed to colloidal Au-NPs during cultivation (G-red ginseng) in rats and their intestinal transport mechanism...
November 11, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335228/fabricating-water-dispersible-superparamagnetic-iron-oxide-nanoparticles-for-biomedical-applications-through-ligand-exchange-and-direct-conjugation
#18
Tina Lam, Pramod K Avti, Philippe Pouliot, Foued Maafi, Jean-Claude Tardif, Éric Rhéaume, Frédéric Lesage, Ashok Kakkar
Stable superparamagnetic iron oxide nanoparticles (SPIONs), which can be easily dispersed in an aqueous medium and exhibit high magnetic relaxivities, are ideal candidates for biomedical applications including contrast agents for magnetic resonance imaging. We describe a versatile methodology to render water dispersibility to SPIONs using tetraethylene glycol (TEG)-based phosphonate ligands, which are easily introduced onto SPIONs by either a ligand exchange process of surface-anchored oleic-acid (OA) molecules or via direct conjugation...
May 26, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335220/pde5-inhibitors-loaded-nanovesicles-physico-chemical-properties-and-in-vitro-antiproliferative-activity
#19
Roberta F De Rose, Maria Chiara Cristiano, Marilena Celano, Valentina Maggisano, Ada Vero, Giovanni Enrico Lombardo, Martina Di Francesco, Donatella Paolino, Diego Russo, Donato Cosco
Novel therapeutic approaches are required for the less differentiated thyroid cancers which are non-responsive to the current treatment. In this study we tested an innovative formulation of nanoliposomes containing sildenafil citrate or tadalafil, phosphodiesterase-5 inhibitors, on two human thyroid cancer cell lines (TPC-1 and BCPAP). Nanoliposomes were prepared by the thin layer evaporation and extrusion methods, solubilizing the hydrophilic compound sildenafil citrate in the aqueous phase during the hydration step and dissolving the lipophilic tadalafil in the organic phase...
May 18, 2016: Nanomaterials
https://www.readbyqxmd.com/read/28335218/aggregation-and-colloidal-stability-of-commercially-available-al%C3%A2-o%C3%A2-nanoparticles-in-aqueous-environments
#20
Julie Mui, Jennifer Ngo, Bojeong Kim
The aggregation and colloidal stability of three, commercially-available, gamma-aluminum oxide nanoparticles (γ-Al₂O₃ NPs) (nominally 5, 10, and 20-30 nm) were systematically examined as a function of pH, ionic strength, humic acid (HA) or clay minerals (e.g., montmorillonite) concentration using dynamic light scattering and transmission electron microscopy techniques. NPs possess pH-dependent surface charges, with a point of zero charge (PZC) of pH 7.5 to 8. When pH < PZC, γ-Al₂O₃ NPs are colloidally stable up to 100 mM NaCl and 30 mM CaCl₂...
May 13, 2016: Nanomaterials
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