نتایج جستجو برای: iron gold nanoparticle

تعداد نتایج: 249304  

2016
Patrick A Reissner Jean-Nicolas Tisserant Antoni Sánchez-Ferrer Raffaele Mezzenga Andreas Stemmer

Gold nanoparticle monolayers provide convenient templates to study charge transport in organic molecules beyond single junction techniques. Conductance is reported to increase by several orders of magnitude following immersion of alkanethiol-stabilized gold nanoparticle monolayers in a solution containing conjugated thiol-functionalized molecules. Typically, this observation is attributed to mo...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2016
Klara Kirschbaum Jana K Sonner Matthias W Zeller Katrin Deumelandt Julia Bode Rakesh Sharma Thomas Krüwel Manuel Fischer Angelika Hoffmann Milene Costa da Silva Martina U Muckenthaler Wolfgang Wick Björn Tews John W Chen Sabine Heiland Martin Bendszus Michael Platten Michael O Breckwoldt

Innate immune cells play a key role in the pathogenesis of multiple sclerosis and experimental autoimmune encephalomyelitis (EAE). Current clinical imaging is restricted to visualizing secondary effects of inflammation, such as gliosis and blood-brain barrier disruption. Advanced molecular imaging, such as iron oxide nanoparticle imaging, can allow direct imaging of cellular and molecular activ...

Journal: :ACS nano 2014
Evgeny Smirnov Micheál D Scanlon Dmitry Momotenko Heron Vrubel Manuel A Méndez Pierre-Francois Brevet Hubert H Girault

Simple methods to self-assemble coatings and films encompassing nanoparticles are highly desirable in many practical scenarios, yet scarcely any examples of simple, robust approaches to coat macroscopic droplets with continuous, thick (multilayer), reflective and stable liquid nanoparticle films exist. Here, we introduce a facile and rapid one-step route to form films of reflective liquid-like ...

Ali Akbar Rostami, Homa Mohseni Kouchesfehani, Rahman Fakheri, Sahar Kiani,

Background: Despite the wide range of applications, there is a serious lack of information on the impact of the nanoparticles on human health and the environment. The present study was done to determine the range of dangerous concentrations of iron oxide nanoparticle and their effects on mouse embryonic stem cells. Methods: Iron oxide nanoparticles with less than 20 nanometers diameter were en...

Journal: :Nanotechnology 2013
Wonjoo Lee Seung Yong Lee Xin Zhang Oded Rabin R M Briber

We present a novel and simple method for forming hexagonal gold nanoparticle arrays that uses Coulombic interactions between negatively charged gold nanoparticles on positively charged vertically oriented poly(4-vinylpyridine) cylinders formed in a spin cast polystyrene-b-poly(4-vinylpyridine) block copolymer film. Exposure of the block copolymer film to dibromobutane vapor quaternizes and cros...

Journal: :Medicine and health, Rhode Island 2012
Wei Lu

mediciNe & HealtH/RHode iSlaNd partICleS Can be engIneered to nanometer-size (nm) which are only 1/1,000 the width of a single human hair. Nanoparticles made of gold display strong optical absorption. A special type of gold nanoparticle called hollow gold nanoparticle has a core-shell nanostructure with unique characteristics, including small particle size (~40 nm in diameter), which is an idea...

Journal: :Genetics and molecular research : GMR 2013
H A Khan M A K Abdelhalim A S Alhomida M S Al Ayed

Most studies have used in vitro systems to test inflammatory responses of nanoparticles; these may not reflect the real biological response of body organs. In fact, certain nanoparticles have provoked opposite effects under in vitro and in vivo conditions. Current understanding of the biocompatibility of gold nanoparticles is controversial. We studied the acute (1 day) and sub-chronic (5 days) ...

Journal: :Langmuir : the ACS journal of surfaces and colloids 2010
Michael T Demko Jim C Cheng Albert P Pisano

A novel microfluidic molding process was used to form microscale features of gold nanoparticles on polyimide, glass, and silicon substrates. This technique uses permeation pumping to pattern and concentrate a nanoparticle ink inside microfluidic channels created in a porous polymer template in contact with a substrate. The nanoparticle ink is self-concentrated in the microchannels, resulting in...

Journal: :Physical review letters 2012
Christiane Höppener Zachary J Lapin Palash Bharadwaj Lukas Novotny

We experimentally demonstrate cascaded field enhancement by means of gold nanoparticle dimer and trimer antennas. The local field enhancement is probed by single-molecule fluorescence using fluorophores with high intrinsic quantum efficiency (Q(0)>80%). Using a self-similar trimer antenna consisting of 80, 40, and 20 nm gold nanoparticles, we demonstrate a fluorescence enhancement of 40 and a s...

Journal: :iranian journal of allergy, asthma and immunology 0
saeid goudarzi clinical nanomedicine laboratory, ent- head & neck research center, hazrate rasoul akram hospital, iran university of medical sciences, tehran, iran. anita ahmadi biosensor research center, endocrinology and metabolism molecular-cellular sciences institute, tehran university of medical sciences, tehran, iran and endocrinology and metabolism research center, endocrinology and metabolism research institute, tehran university of medical sciences, tehran, iran mohammad farhadi clinical nanomedicine laboratory, ent- head & neck research center, hazrate rasoul akram hospital, iran university of medical sciences, tehran, iran. seyed kamran kamrava clinical nanomedicine laboratory, ent- head & neck research center, hazrate rasoul akram hospital, iran university of medical sciences, tehran, iran. shiva saghafi immunology, asthma & allergy research institute, tehran university of medical sciences, tehran, iran. kobra omidfar biosensor research center, endocrinology and metabolism molecular-cellular sciences institute, tehran university of medical sciences, tehran, iran and endocrinology and metabolism research center, endocrinology and metabolism research institute, tehran university of medical sciences, tehran, iran

a new competitive immunochromatography (icg) strip test based on polyclonal antibody (pab) conjugated with gold nanoparticles (nps) was developed and its applications for primary screening of immunoglobulin (ig) a in serum were evaluated. nanocolloidal gold as the detection reagent, with an average particle diameter of 20 nm, was synthesized and labelled pab. the antibody-nanocolloidal gold pro...

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