Time and Temperature Effects on the Digestive Ripening of Gold Nanoparticles: Is There a Crossover from Digestive Ripening to Ostwald Ripening?

Langmuir ◽  
2014 ◽  
Vol 30 (34) ◽  
pp. 10143-10150 ◽  
Author(s):  
Puspanjali Sahu ◽  
Bhagavatula L. V. Prasad
Keyword(s):  
Gold Nanoparticles ◽  
Temperature Effects ◽  
Ostwald Ripening ◽  
Digestive Ripening

Synthesis of Gold Nanoparticles in Liquid Polyethylene Glycol by Sputter Deposition and Temperature Effects on their Size and Shape

2011 ◽  
Vol 115 (8) ◽  
pp. 3279-3285 ◽  
Author(s):  
Yoshikiyo Hatakeyama ◽  
Takeshi Morita ◽  
Satoshi Takahashi ◽  
Kei Onishi ◽  
Keiko Nishikawa
Keyword(s):  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Temperature Effects ◽  
Sputter Deposition ◽  
Size And Shape

Synthesis of large gold nanoparticles with deformation twinnings by one-step seeded growth with Cu(ii)-mediated Ostwald ripening for determining nitrile and isonitrile groups

Nanoscale ◽  
2020 ◽  
Vol 12 (32) ◽  
pp. 16934-16943
Author(s):  
Chenshuo Wu ◽  
Hongpeng He ◽  
Yahui Song ◽  
Cuixia Bi ◽  
Lixiang Xing ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Ostwald Ripening ◽  
Seeded Growth ◽  
Growth Method ◽  
One Step

Gold nanoparticles with deformation twinnings prepared by a Cu2+-assisted one-step seeded growth method can distinguish nitrile and isonitrile groups by SERS.

Field effect on digestive ripening of thiol-capped gold nanoparticles

2014 ◽  
Vol 115 (5) ◽  
pp. 054312 ◽  
Author(s):  
Meng-Lin Lin ◽  
Fuqian Yang ◽  
J. S. Peng ◽  
Sanboh Lee
Keyword(s):  
Gold Nanoparticles ◽  
Field Effect ◽  
Digestive Ripening

Controlled Growth of Gold Nanoparticles on Silica Nanowires

2005 ◽  
Vol 20 (11) ◽  
pp. 3021-3027 ◽  
Author(s):  
Aaron D. LaLonde ◽  
M. Grant Norton ◽  
Daqing Zhang ◽  
Devananda Gangadean ◽  
Abdullah Alkhateeb ◽  
...  
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Substrate Temperature ◽  
Size Distribution ◽  
Surface Diffusion ◽  
Ostwald Ripening ◽  
Size Control ◽  
Chemical Vapor ◽  
Chamber Pressure ◽  
Transmission Electron

Production of gold nanoparticles with the specific goal of particle size control has been investigated by systematic variation of chamber pressure and substrate temperature. Gold nanoparticles have been synthesized on SiO2 nanowires by plasma-enhanced chemical vapor deposition. Determination of particle size and particle size distribution was done using transmission electron microscopy. Average nanoparticle diameters were between 4 and 12 nm, with particle size increasing as substrate temperature increased from 573 to 873 K. A bimodal size distribution was observed at temperatures ≥723 K indicating Ostwald ripening dominated by surface diffusion. The activation energy for surface diffusion of gold on SiO2 was determined to be 10.4 kJ/mol. Particle sizes were found to go through a maximum with increases in chamber pressure. Competition between diffusion within the vapor and dissociation of the precursor caused the pressure effect.

scholarly journals Formation of Superlattices of Gold Nanoparticles Using Ostwald Ripening in Emulsions: Transition from fcc to bcc Structure

2016 ◽  
Vol 120 (25) ◽  
pp. 5759-5766 ◽  
Author(s):  
Julien Schmitt ◽  
Stéphanie Hajiw ◽  
Amélie Lecchi ◽  
Jéril Degrouard ◽  
Anniina Salonen ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Ostwald Ripening ◽  
Bcc Structure

scholarly journals Encapsidation of Different Plasmonic Gold Nanoparticles by the CCMV CP

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2628
Author(s):  
Ana L. Durán-Meza ◽  
Martha I. Escamilla-Ruiz ◽  
Xochitl F. Segovia-González ◽  
Maria V. Villagrana-Escareño ◽  
J. Roger Vega-Acosta ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Surface Charge ◽  
Gold Nanorods ◽  
Self Assembly ◽  
Ostwald Ripening ◽  
Gold Nanoshells ◽  
Medical Applications ◽  
Cowpea Chlorotic Mottle Virus ◽  
Chlorotic Mottle Virus ◽  
Chlorotic Mottle

Different types of gold nanoparticles have been synthesized that show great potential in medical applications such as medical imaging, bio-analytical sensing and photothermal cancer therapy. However, their stability, polydispersity and biocompatibility are major issues of concern. For example, the synthesis of gold nanorods, obtained through the elongated micelle process, produce them with a high positive surface charge that is cytotoxic, while gold nanoshells are unstable and break down in a few weeks due to the Ostwald ripening process. In this work, we report the self-assembly of the capsid protein (CP) of cowpea chlorotic mottle virus (CCMV) around spherical gold nanoparticles, gold nanorods and gold nanoshells to form virus-like particles (VLPs). All gold nanoparticles were synthesized or treated to give them a negative surface charge, so they can interact with the positive N-terminus of the CP leading to the formation of the VLPs. To induce the protein self-assembly around the negative gold nanoparticles, we use different pH and ionic strength conditions determined from a CP phase diagram. The encapsidation with the viral CP will provide the nanoparticles better biocompatibility, stability, monodispersity and a new biological substrate on which can be introduced ligands toward specific cells, broadening the possibilities for medical applications.

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