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Non-Layer-by-Layer Assembly and Encapsulation Uses of Nanoparticle-Shelled Hollow Spheres

  • Gautam C. Kini
  • Sibani L. Biswal
  • Michael S. WongEmail author
Chapter
Part of the Advances in Polymer Science book series (POLYMER, volume 229)

Abstract

Nanoparticles (NPs, diameter range of 1–100nm) can have size-dependent physical and electronic properties that are useful in a variety of applications. Arranging them into hollow shells introduces the additional functionalities of encapsulation, storage, and controlled release that the constituent NPs do not have.This chapter examines recent developments in the synthesis routes and properties of hollow spheres formed out of NPs. Synthesis approaches reviewed here are recent developments in the electrostatics-based tandem assembly and interfacial stabilization routes to the formation of NP-shelled structures. Distinct from the well-established layer-by-layer (LBL) synthesis approach, the former route leads to NP/polymer composite hollow spheres that are potentially useful in medical therapy, catalysis, and encapsulation applications. The latter route is based on interfacial activity and stabilization by NPs with amphiphilic properties, to generate materials like colloidosomes, Pickering emulsions, and foams. The varied types of NP shells can have unique materials properties that are not found in the NP building blocks, or in polymer-based, surfactant-based, or LBL-assembled capsules.

Keyword

Hollow spheres Nanoparticles Layer-by-layer assembly Tandem assembly Nanoparticle assembled capsule Interfacial stabilization Particle stabilized emulsion 

Abbreviations

Cys

Cysteine

E

Energy of attachment

EDTA

Tetrasodium ethylenediamine tetraacetate

FDA

Food and Drug Administration

ICG

Indocyanine green

k

Boltzmann’s constant

LBL

Layer-by-layer

Lys

Lysine

NAC

Nanoparticle assembled capsule

NIR

Near-infrared

NP

Nanoparticle

O/W

Oil-in-water

PAA

Poly(acrylic acid)

PAH

Poly(allylamine hydrochloride)

PE

Polyelectrolyte

PLL

Poly-l-lysine

QD

Quantum dot

R

R ratio, defined as the total negative charge from a multivalent anion divided by the total positive charge from the polymer

r

Particle radius

SEM

Scanning electron microscope

T

Temperature

TEM

Transmission electron microscope

TGA

Thermogravimetric analysis

W/O

Water-in-oil

Notes

Acknowledgement

We acknowledge the financial support of National Science Foundation (CBET-0652073) and the Rice University Institute of Biosciences and Bioengineering Medical Innovations Award.

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Copyright information

© Springer 2010

Authors and Affiliations

  • Gautam C. Kini
    • 1
  • Sibani L. Biswal
    • 1
  • Michael S. Wong
    • 1
    • 2
    Email author
  1. 1.Department of Chemical and Biomolecular EngineeringRice UniversityHoustonUSA
  2. 2.Department of ChemistryRice UniversityHoustonUSA

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