Synthesis of Gold Nanoparticles from an Organometallic Compound in Supercritical Carbon Dioxide

Langmuir ◽  
2004 ◽  
Vol 20 (13) ◽  
pp. 5189-5191 ◽  
Author(s):  
Kunio Esumi ◽  
Susumu Sarashina ◽  
Tomokazu Yoshimura
Keyword(s):  
Carbon Dioxide ◽  
Gold Nanoparticles ◽  
Supercritical Carbon Dioxide ◽  
Organometallic Compound ◽  
Supercritical Carbon

Impregnation of Ru(cod)(tmhd)2 into PDMS Film in Supercritical Carbon Dioxide

2011 ◽  
Vol 418-420 ◽  
pp. 2260-2264
Author(s):  
Ming Lan Ge ◽  
Fu Chen Ding ◽  
Can Erkey
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Organometallic Compound ◽  
Fluid Phase ◽  
Constant Density ◽  
Pdms Film ◽  
Equilibrium Partition ◽  
Equilibrium Partition Coefficient ◽  
Supercritical Solution ◽  
Supercritical Carbon

Metallopolymer nanocomposites has attracted much attention recently. The impregnation of organometallic compound from the supercritical solution into the polymer matrix has several advantages. The impregnation process isotherm of bis(2,2,6,6-tetramethyl-3,5-heptanedionato) (1,5-cyclooctadiene) ruthenium (II) (Ru(cod)(tmhd)2) into polydimethylsiloxane (PDMS) film in supercritical carbon dioxide (scCO2) was investigated. The experiments for determining the isotherm were carried out at 40 °C and 10.34 MPa. It was found that the impregnation isotherm is linear up to the saturation concentration of the precursor in scCO2fluid phase. The slope of the linear curve defined equilibrium partition coefficient K provides a measure of the partitioning of Ru(cod)(tmhd)2between the PDMS film and scCO2fluid phase and it is constant under the same conditions. It showed that K is mainly govered by the density of scCO2and does not change much with temperature at a constant density of scCO2.

scholarly journals Supercritical Carbon Dioxide Impregnation of Gold Nanoparticles Demonstrates a New Route for the Fabrication of Hybrid Silk Materials

Insects ◽  
2021 ◽  
Vol 13 (1) ◽  
pp. 18
Author(s):  
Manish Singh ◽  
Estera S. Dey ◽  
Sunil Bhand ◽  
Cedric Dicko
Keyword(s):  
Carbon Dioxide ◽  
Gold Nanoparticles ◽  
Supercritical Carbon Dioxide ◽  
Structural Changes ◽  
Combined Effects ◽  
Silk Fibers ◽  
Carrier Fluid ◽  
Concentration Time ◽  
Gold Nps ◽  
Supercritical Carbon

How many nanoparticles can we load in a fiber? How much will leak? Underlying is the relatively new question of the “space available” in fibers for nanoparticle loading. Here, using supercritical carbon dioxide (scCO2) as a carrier fluid, we explored the impregnation in four Indian silks (Mulberry, Eri, Muga, and Tasar) with five standard sizes of gold nanoparticles (5, 20, 50, 100 and 150 nm in diameter). All silks could be permanently impregnated with nanoparticles up to 150 nm in size under scCO2 impregnation. Accompanying structural changes indicated that the amorphous silk domains reorganized to accommodate the gold NPs. The mechanism was studied in detail in degummed Mulberry silk fibers (i.e., without the sericin coating) with the 5 nm nanoparticle. The combined effects of concentration, time of impregnation, scCO2 pressure, and temperature showed that only a narrow set of conditions allowed for permanent impregnation without deterioration of the properties of the silk fibers.

Germanium Nanowire Synthesis from Fluorothiolate-Capped Gold Nanoparticles in Supercritical Carbon Dioxide

2010 ◽  
Vol 22 (18) ◽  
pp. 5235-5243 ◽  
Author(s):  
Gillian Collins ◽  
Maria Koleśnik ◽  
Vojislav Krstić ◽  
Justin D. Holmes
Keyword(s):  
Carbon Dioxide ◽  
Gold Nanoparticles ◽  
Supercritical Carbon Dioxide ◽  
Nanowire Synthesis ◽  
Supercritical Carbon
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