Effect of Hydrophobicity inside PEO−PPO−PEO Block Copolymer Micelles on the Stabilization of Gold Nanoparticles: Experiments

Langmuir ◽  
2006 ◽  
Vol 22 (23) ◽  
pp. 9704-9711 ◽  
Author(s):  
Shu Chen ◽  
Chen Guo ◽  
Guo-Hua Hu ◽  
Jing Wang ◽  
Jun-He Ma ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymer ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Block Copolymer Micelles as Nanoreactors for Self-Assembled Morphologies of Gold Nanoparticles

2013 ◽  
Vol 117 (10) ◽  
pp. 3028-3039 ◽  
Author(s):  
Poonam Khullar ◽  
Vijender Singh ◽  
Aabroo Mahal ◽  
Harsh Kumar ◽  
Gurinder Kaur ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymer ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles ◽  
Self Assembled

scholarly journals Electrochemical preparation system for unique mesoporous hemisphere gold nanoparticles using block copolymer micelles

RSC Advances ◽  
2020 ◽  
Vol 10 (14) ◽  
pp. 8309-8313 ◽  
Author(s):  
Hyunsoo Lim ◽  
Tomota Nagaura ◽  
Minjun Kim ◽  
Kenya Kani ◽  
Jeonghun Kim ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymer ◽  
Electrochemical Reduction ◽  
Au Nanoparticles ◽  
Electrochemical Preparation ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles ◽  
Self Assembled ◽  
First Time

Mesoporous hemisphere Au nanoparticles using self-assembled micelles, for the first time, are demonstrated by using electrochemical reduction on a Ti substrate.

TUNING OF BLOCK COPOLYMER-MEDIATED SYNTHESIS OF GOLD NANOPARTICLES

2011 ◽  
Vol 10 (04n05) ◽  
pp. 1035-1038 ◽  
Author(s):  
DEBES RAY ◽  
V. K. ASWAL ◽  
D. SRIVASTAVA
Keyword(s):  
Gold Nanoparticles ◽  
Block Copolymer ◽  
Number Density ◽  
Copolymer Concentration ◽  
Transmission Electron ◽  
Visible Spectra ◽  
Block Copolymer Micelles ◽  
Uv Visible ◽  
Copolymer Micelles ◽  
The Stability

The yield and stability of synthesis of gold nanoparticles has been examined using triblock copolymer Pluronic P85 (EO26PO39EO26) at varying concentrations as a function of hydrogen tetrachloroaureate (III) hydrate (HAuCl4.3H2O) in aqueous solution. The surface plasmon resonance in the time-dependent UV-Visible spectra reveals that increase in the block copolymer concentration increases the yield of the gold nanoparticles but decreases their stability. Small-angle neutron scattering (SANS) suggests that the number density of block copolymer micelles increase almost linearly with the concentration, which is related to result in higher numbers of nucleation centers and therefore increase in the yield of gold nanoparticles. The fact that increase in the number density of nanoparticles also increases the chances of aggregation and this tends to decrease the stability at higher block copolymer concentration. Transmission electron microscopy (TEM) images confirm the larger sizes of the nanoparticles formed in these systems at higher concentrations.

β-lactam Functionalized Poly(isoprene-b-ethylene oxide) Amphiphilic Block Copolymer Micelles as a New Nanocarrier System for Curcumin

2010 ◽  
Vol 6 (3) ◽  
pp. 277-284 ◽  
Author(s):  
Konstantinos Gardikis ◽  
Konstantinos Dimas ◽  
Aristidis Georgopoulos ◽  
Eleni Kaditi ◽  
Stergios Pispas ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Ethylene Oxide ◽  
Amphiphilic Block Copolymer ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Donnan Equilibria in Polymeric Micellar Systems with Weak Polyelectrolyte Shells: The Lowering of the pH Value

1997 ◽  
Vol 62 (11) ◽  
pp. 1730-1736 ◽  
Author(s):  
Petr Munk ◽  
Zdeněk Tuzar ◽  
Karel Procházka
Keyword(s):  
Ionic Strength ◽  
Block Copolymer ◽  
Ph Value ◽  
Electrolyte Solutions ◽  
Hydrogen Ions ◽  
Micellar Systems ◽  
Weak Electrolytes ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles ◽  
Polyelectrolyte Solutions

When two electrolyte solutions are separated and only some of the ions can cross the boundary, the concentrations of these ions are different on both sides of the boundary. This is the well-known Donnan effect. When weak electrolytes are involved, the imbalance includes also hydrogen ions: there is a difference of pH across the boundary and the dissociation of nondiffusible weak electrolytes is suppressed. The effect is very pronounced when the concentration of the weak electrolyte is high and ionic strength is low. The significance of this phenomenon is discussed for polyelectrolyte solutions, and particularly for block copolymer micelles with weak polyelectrolyte shells. The effect is quite dramatic in the latter case.

A Monte Carlo Study of Flexible Polymer Chain Conformations in Restricted Volumes. I. A Model for Insoluble Blocks Conformations in Swollen Cores of Multimolecular Spherical Block Copolymer Micelles

1993 ◽  
Vol 58 (10) ◽  
pp. 2290-2304 ◽  
Author(s):  
Zuzana Limpouchová ◽  
Karel Procházka
Keyword(s):  
Monte Carlo ◽  
Block Copolymer ◽  
Monte Carlo Study ◽  
Volume Effect ◽  
Micellar Systems ◽  
Flexible Polymer ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles ◽  
Chain Conformations ◽  
Chain Lengths

Monte Carlo simulations of chain conformations in a restricted spherical volume at relatively high densities of segments were performed for various numbers of chains, N, and chain lengths (number of segments), L, on a tetrahedral lattice. All chains are randomly end-tethered to the surface of the sphere. A relatively uniform surface density of the tethered ends is guaranteed in our simulations. A simultaneous self-avoiding walk of all chains creates starting conformations for a subsequent equilibration. A modified algorithm similar to that of Siepmann and Frenkel is used for the equilibration of the chain conformations. In this paper, only a geometrical excluded volume effect of segments is considered. Various structural and conformational characteristics, e.g. segment densities gS(r), free end densities gF(r) as functions of the position in the sphere (a distance from the center), distributions of the tethered-to-free end distances, ρTF(rTF), etc. are calculated and their physical meaning is discussed. The model is suitable for studies of chain conformations is swollen cores of multimolecular block copolymer micelles and for interpretation of non-radiative excitation energy migration in polymeric micellar systems.

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