نتایج جستجو برای: surface modified nanoparticle

تعداد نتایج: 887611  

Journal: :Journal of nanoscience and nanotechnology 2014
Huei-Shian Lin James R Carey

Nanoparticle coated microspheres are composed of two or more materials with a core/shell structure and exhibit unique abilities that allow amplification of trace targets in immunoassays. The preparation of nanoparticle coated microspheres can be accomplished using three main strategies: (1) in-situ, (2) ex-situ, and (3) hollow sphere methods. Antibodies or biomolecules can be immobilized on the...

Journal: :Optics express 2013
H Y Chung P T Leung D P Tsai

The modified fluorescence properties of a molecule in the vicinity of a metallic nanoparticle are further studied accounting for the possible existence of extraneous charges on the particle surface. This is achieved via a generalization of the previous theory of Bohren and Hunt for light scattering from a charged sphere, with the results applied to the calculation of the various decay rates and...

2014
Alexandra M. Münzer Wanji Seo Gregory J. Morgan Zachary P. Michael Yong Zhao Katharina Melzer Giuseppe Scarpa Alexander Star

We report on the reversible detection of CaptAvidin, a tyrosine modified avidin, with single-walled carbon nanotube (SWNT) field-effect transistors (FETs) noncovalently functionalized with biotin moieties using 1-pyrenebutyric acid as a linker. Binding affinities at different pH values were quantified, and the sensor's response at various ionic strengths was analyzed. Furthermore, protein "fing...

Journal: :Journal of the American Chemical Society 2010
Martin J Mulvihill Xing Yi Ling Joel Henzie Peidong Yang

The understanding of the localized surface plasmons (LSPs) that occur at the geometrically bounded surface of metal nanoparticles continues to advance as new and more complex nanostructures are found. It has been shown that the oscillation of electrons at the metal dielectric interface is strongly dependent on the size, symmetry, and proximity of nanoparticles. Here, we present a new method to ...

Journal: :Journal of nanoscience and nanotechnology 2008
John E Wong Akhilesh K Gaharwar Detlef Müller-Schulte Dhirendra Bahadur Walter Richtering

This study describes the surface modification of magnetic nanoparticles using two different approaches. The first approach consists of an in situ modification of the surface during the precipitation of the magnetic nanoparticles while the second approach consists of a post-modification of the surface after the formation of the magnetic nanoparticles. In the latter case, we adopted the Layer-by-...

Journal: :Journal of the American Chemical Society 2003
Lisa B Lowe Scott H Brewer Stephan Krämer Ryan R Fuierer Guoguang Qian Chiamaka O Agbasi-Porter Selina Moses Stefan Franzen Daniel L Feldheim

Laser-induced temperature jumps (LITJs) at gold nanoparticle-coated indium tin oxide (ITO) electrodes in contact with electrolyte solutions have been measured using temperature-sensitive redox probes and an infrared charge-coupled device. Upon irradiation with 532 nm light, interfacial temperature changes of ca. 20 degrees C were recorded for particle coverages of ca. 1 x 1010 cm-2. In the pres...

2013
Yi Zhang Xi He Jing Ouyang Huaming Yang

Palladium (Pd) nanoparticles were deposited on the surface of halloysite nanotubes (HNTs) modified with γ-aminopropyltriethoxysilane (APTES) to produce Pd/NH2-HNTs nanocomposites. The results indicated that Pd nanoparticles were densely immobilized onto NH2-HNTs with an average diameter of ~ 3 nm. The Pd distribution on the surface of silanized HNTs showed much more uniform, and the Pd nanopart...

2008
C Westman S Jang J P Liu

A model based on competing exchange interactions is presented for the investigation of nanoparticle magnetization. The ferromagnetic (FM) and antiferromagnetic (AFM) exchange interactions contribute differently at the nanoparticle surface and interior, leading to reduced ferromagnetic order at the surface. This model predicts an unconventional temperature dependence of magnetization and a surfa...

Journal: :Macromolecular bioscience 2006
Jamie M Bergen Horst A von Recum Thomas T Goodman Archna P Massey Suzie H Pun

The development of targeted vehicles for systemic drug delivery relies on optimizing both the cell-targeting ligand and the physicochemical characteristics of the nanoparticle carrier. A versatile platform based on modification of gold nanoparticles with thiolated polymers is presented in which design parameters can be varied independently and systematically. Nanoparticle formulations of varyin...

Journal: :Entropy 2012
Kuo-Hao Lee F. Marty Ytreberg

Molecular dynamics simulations were used to characterize the structure and dynamics for several peptides and the effect of conjugating them to a gold nanoparticle. Peptide structure and dynamics were compared for two cases: unbound peptides in water, and peptides bound to the gold nanoparticle surface in water. The results show that conjugating the peptides to the gold nanoparticle usually decr...

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