نتایج جستجو برای: metal nanoparticles

تعداد نتایج: 294819  

Journal: :Chemical communications 2015
Darui Wang Bing Ma Bo Wang Chen Zhao Peng Wu

Hierarchically porous zeolite supported metal nanoparticles are successfully prepared through a base-assisted chemoselective interaction between the silicon species on the zeolite crystal surface and metal salts, in which in situ construction of mesopores and high dispersion of metal species are realized simultaneously.

Journal: :Nature materials 2009
Sang Hoon Joo Jeong Young Park Chia-Kuang Tsung Yusuke Yamada Peidong Yang Gabor A Somorjai

Recent advances in colloidal synthesis enabled the precise control of the size, shape and composition of catalytic metal nanoparticles, enabling their use as model catalysts for systematic investigations of the atomic-scale properties affecting catalytic activity and selectivity. The organic capping agents stabilizing colloidal nanoparticles, however, often limit their application in high-tempe...

2014
V. V. Makarov A. J. Love O. V. Sinitsyna S. S. Makarova I. V. Yaminsky M. E. Taliansky N. O. Kalinina

While metal nanoparticles are being increasingly used in many sectors of the economy, there is growing interest in the biological and environmental safety of their production. The main methods for nanoparticle production are chemical and physical approaches that are often costly and potentially harmful to the environment. The present review is devoted to the possibility of metal nanoparticle sy...

2016
Jiří Tuček Zdeněk Sofer Daniel Bouša Martin Pumera Kateřina Holá Aneta Malá Kateřina Poláková Markéta Havrdová Klára Čépe Ondřej Tomanec Radek Zbořil

Superparamagnetism is a phenomenon caused by quantum effects in magnetic nanomaterials. Zero-valent metals with diameters below 5 nm have been suggested as superior alternatives to superparamagnetic metal oxides, having greater superspin magnitudes and lower levels of magnetic disorder. However, synthesis of such nanometals has been hindered by their chemical instability. Here we present a meth...

Journal: :Chemical communications 2014
Nilantha P Wickramaratne Mietek Jaroniec

Metal nanoparticle-decorated carbon spheres (mn-CSs) are prepared by combining one-pot hydrothermal synthesis and post-synthesis modification. The former sol-gel type process is employed to obtain heteroatom-containing polymer spheres (PSs), which easily attract metal species that, during thermal treatment, are initially converted to nanoparticle-decorated PSs and finally to mn-CSs.

2017
Jose ́ A. Manzanares Pekka Peljo Hubert H. Girault

Most syntheses of thiolate-protected metal nanoparticles (NPs) include a thermochemical step in which the as-prepared, polydisperse NPs are transformed to a narrower size distribution in a poorly understood process known as digestive ripening (DR). Previous theoretical approaches considered either surface and electrostatic contributions or surface and ligand-binding contributions. We show that ...

2017
Qiu Yang Wenxian Liu Bingqing Wang Weina Zhang Xiaoqiao Zeng Cong Zhang Yongji Qin Xiaoming Sun Tianpin Wu Junfeng Liu Fengwei Huo Jun Lu

Composites incorporating metal nanoparticles (MNPs) within metal-organic frameworks (MOFs) have broad applications in many fields. However, the controlled spatial distribution of the MNPs within MOFs remains a challenge for addressing key issues in catalysis, for example, the efficiency of catalysts due to the limitation of molecular diffusion within MOF channels. Here we report a facile strate...

2017
Yonggang Yao Fengjuan Chen Anmin Nie Steven D. Lacey Rohit Jiji Jacob Shaomao Xu Zhennan Huang Kun Fu Jiaqi Dai Lourdes Salamanca-Riba Michael R. Zachariah Reza Shahbazian-Yassar Liangbing Hu

Nanoparticles (NPs) dispersed within a conductive host are essential for a range of applications including electrochemical energy storage, catalysis, and energetic devices. However, manufacturing high quality NPs in an efficient manner remains a challenge, especially due to agglomeration during assembly processes. Here we report a rapid thermal shock method to in situ synthesize well-dispersed ...

2017
Chen Chen Yongan Tang Branislav Vlahovic Fei Yan

The integration of different noble metal nanostructures, which exhibit desirable plasmonic and/or electrocatalytic properties, with electrospun polymer nanofibers, which display unique mechanical and thermodynamic properties, yields novel hybrid nanoscale systems of synergistic properties and functions. This review summarizes recent advances on how to incorporate noble metal nanoparticles into ...

Journal: :Nano letters 2015
Kargal L Gurunatha Sarrah Marvi Gaurav Arya Andrea R Tao

The bottom-up fabrication of ordered and oriented colloidal nanoparticle assemblies is critical for engineering functional nanomaterials beyond conventional polymer-particle composites. Here, we probe the influence of polymer surface ligands on the self-orientation of shaped metal nanoparticles for the formation of nanojunctions. We examine how polymer graft-surface interactions dictate Ag nano...

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