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Preparation and Structure Transformation of Polyelectrolyte Multilayer Nanotubes

Author: HeWenPing
Tutor: HeQiang
School: Harbin Institute of Technology
Course: Physical and chemical
Keywords: Layer-by-Layer templates polyelectrolyte multilayer nanotubes structure transformation drug encapsulation
CLC: O631.3
Type: Master's thesis
Year: 2012
Downloads: 6
Quote: 0
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Abstract


Nanomaterial is a growing field in materials science due to its physical andchemical properties. Layer-by-layer (LbL) self-assembly technique is interestingmethod to prepare the ordered films because of its simplicity and operability.Combining with porous template, the LbL-templating technique can prepare thepolyelectrolyte multilayer nanotubes with diverse compositions. Here we demonstratethe preparation of polyelectrolyte nanotubes with controllable size and compositionbase on electrostatic attraction, and the nanotubes can be functionalized fluorescentand magnetic properties. We find that the polyelectrolyte multilayer nanotubesdisplay the transformation of structure above the glass transition temperature in saltsolution. The mainly contents of this study were stated as the following:We use the polyphenyleneethylene sulfonate (PSS)、 polypropylene aminehydrochloride (PAH) or poly dimethyl diallyl ammonium chloride (PDADMAC) aspairs to prepare the nanotubes. Through the electrostatic attraction, the negativecharged sulfonic acid moiety can aborb to the amino groups positively charged basedon porous alumina template or polycarbonate(PC) template.The polyelectrolyte multilayer nanotubes can be functionalized by introducingmagnetic nanoparticles into the nanotubes. The magnetic nanotubes can be used ascarrier of drug delivery. We assemble the polyelectrolyte labeled isothiocyanatecyanide fluorescein (FITC) to the polyelectrolyte nanotubes.The stability of the self-assembled thin films can be affected by the pH of solution,temperature, salinity and others. According to the principle of Rayleigh instability, thetubular structure will transform from necklace-like to hollow spherical structure whenthe temperature up to critical state. The nanotubes mix up with sodium chloride canreduce the temperature of transform, the density and permeability of the membranechanged.The tubular structure of nanotubes can transform to capsules by heating. Thewater-soluble drugs which mixed up with the tubes can be encapsuled to nanotubes.We use the FITC labeled dextran as model molecules for release studies, the results ofexperiment show that the fluorescent dextran has been encapsuled by the capsulestransformed from nanotubes. Moreover, the efficiency of encapsule increases linearlywith dextran concentration and shows no relevant with the molecule weight ofdextran.

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CLC: > Mathematical sciences and chemical > Chemistry > Polymer chemistry ( polymer ) > Polymer physics and physical chemistry of polymers > The chemical nature of polymers
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