Salt-Induced Block Copolymer Micelles as Nanoreactors for the Formation of CdS Nanoparticles

2001 ◽  
Vol 703 ◽  
Author(s):  
Hanying Zhao ◽  
Elliot P. Douglas
Keyword(s):  
Block Copolymer ◽  
Ph Value ◽  
Cadmium Acetate ◽  
Cds Nanoparticles ◽  
The Core ◽  
Transmission Electron ◽  
Block Copolymer Micelles ◽  
Uv Visible ◽  
Copolymer Micelles ◽  
Location Change

ABSTRACTA novel preparation method of CdS nanoparticles in the core or corona of micelles is presented. Poly(styrene-block-2-vinylpyridine) (PS-b-P2VP) and cadmium ions form aggregates of single micelles, called compound micelles, upon addition of the cadmium acetate salt into a solution of the block copolymer in tetrahydrofuran. The growth of CdS nanoparticles is confined to the core of single micelles after introduction of hydrogen sulfide gas into the solution. UV-visible spectroscopy, fluorescence spectroscopy, and transmission electron microscopy were employed to characterize the prepared core-embedded CdS nanoparticles. Corona-embedded CdS nanoparticles were prepared by dropping the core-embedded CdS nanoparticles into water with a low pH value. The location change of the CdS nanoparticles was accompanied by a structural change of the micelles, a change from compound micelles to single micelles. In a single micelle, CdS nanoparticles distribute randomly in the corona. The size of the nanoparticles increases slightly after the transition.

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.

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.

Directly Resolved Core-Corona Structure of Block Copolymer Micelles by Cryo-Transmission Electron Microscopy

1999 ◽  
Vol 103 (47) ◽  
pp. 10331-10334 ◽  
Author(s):  
Yi Zheng ◽  
You-Yeon Won ◽  
Frank S. Bates ◽  
H. Ted Davis ◽  
L. E. Scriven ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Block Copolymer ◽  
Transmission Electron ◽  
Block Copolymer Micelles ◽  
Corona Structure ◽  
Copolymer Micelles

Location Control of Au/CdS Nanoparticles in Block Copolymer Micelles

Langmuir ◽  
2007 ◽  
Vol 23 (23) ◽  
pp. 11425-11429 ◽  
Author(s):  
Haeng-Deog Koh ◽  
Nam-Goo Kang ◽  
Jae-Suk Lee
Keyword(s):  
Block Copolymer ◽  
Cds Nanoparticles ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Preparation of CdS Nanoparticles in Salt-Induced Block Copolymer Micelles

Langmuir ◽  
2001 ◽  
Vol 17 (26) ◽  
pp. 8428-8433 ◽  
Author(s):  
Hanying Zhao ◽  
Elliot P. Douglas ◽  
Benjamin S. Harrison ◽  
Kirk S. Schanze
Keyword(s):  
Block Copolymer ◽  
Cds Nanoparticles ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

The Core Composition of DNA Block Copolymer Micelles Dictates DNA Hybridization Properties, Nuclease Stabilities, and Cellular Uptake Efficiencies

Nanoscale ◽  
2021 ◽  
Author(s):  
Chan-Jin Kim ◽  
Ga-Hyun Kim ◽  
Eun Hye Jeong ◽  
Hyukjin Lee ◽  
So-Jung Park
Keyword(s):  
Block Copolymer ◽  
Block Copolymers ◽  
Cellular Uptake ◽  
Molecular Interactions ◽  
Dna Hybridization ◽  
Hydrophobic Core ◽  
The Core ◽  
Core Composition ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Here, we report how the nature of the hydrophobic core affects molecular interactions of DNA block copolymer assemblies. Three different amphiphilic DNA block copolymers, DNA-b-polystyrene (DNA-b-PS), DNA-b-poly(2-vinylpyridine) (DNA-b-P2VP), and DNA-b-poly(methyl...

Coordination-induced assemblies of quantum dots in amphiphilic thermo-responsive block copolymer micelles: morphologies, optical properties and applications

2018 ◽  
Vol 9 (22) ◽  
pp. 3158-3168 ◽  
Author(s):  
Jianhua Lü ◽  
Bingxin Liu ◽  
Bingfeng Shi ◽  
Changli Lü
Keyword(s):  
Quantum Dots ◽  
Optical Properties ◽  
Block Copolymer ◽  
Selective Detection ◽  
The Core ◽  
Block Copolymer Micelles ◽  
Copolymer Micelles

Thermo-responsive dual-emitting QD/BCP assemblies with QDs located in the core (CDMs), shell (SDMs) and the interface (IDMs) between the core and the shell of micelles were constructed via coordination-driven assemblies for the selective detection of TNP and Hg2+ ions.

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