LrgpV1, Main, Curation, bibRecord, 000907

Control of Swelling of Responsive Nanogels by Nanoconfinement

Identifieur interne : 000907 ( Main/Curation ); précédent : 000906; suivant : 000908

Control of Swelling of Responsive Nanogels by Nanoconfinement

Auteurs : Stéphane Cuenot [France] ; Sadia Radji [France] ; Halima Alem [France] ; Sophie Demoustier-Champagne [Belgique] ; Alain M. Jonas [Belgique]

Source :

Small [ 1613-6810 ] ; 2012-10-08.

RBID : ISTEX:A0B094C688CC18D44F7B3F82202BCD0DF00775D8

Descripteurs français

Wicri :
- topic : Polymère.

English descriptors

Abstract

The volume phase transition (VPT) behavior and the swelling properties of individual thermoresponsive poly(N‐isopropylacrylamide) (PNIPAM)‐based nanogels are investigated by in situ atomic force microscopy (AFM). Using a template‐based synthesis method, cylindrical nanogels are synthesized for different polymerization times within nanopores (80 nm) of poly(ethylene terephthalate) (PET) track‐etched membranes. The confinement conditions, characterized by the ratio Φ between the average chain length and the pore diameter, are varied between 0.35 and 0.8. After dissolving the membranes, the volume of individual nanogels composed of PNIPAM‐g‐PET diblock copolymers is numerically extracted from AFM images while varying the water temperature from 28 to 44 °C. From the measured volumes, the swelling of nanogels is investigated as a function of both the water temperature and the confinement conditions imposed during the synthesis. Contrary to the VPT, the maximum swelling of the nanogels is strongly affected by these confinement conditions. The volume of nanogels in the swollen state can reach 1.1 to 2.1 times their volume in the collapsed state for a ratio Φ of 0.8 and 0.5, respectively. These results open a new way to tune the swelling of nanogels, simply by adjusting the degree of confinement imposed during their synthesis within nanopores, which is particularly interesting for biomedical applications requiring a high degree of control over swelling properties, such as drug‐delivery nanotools.

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https://api.istex.fr/document/A0B094C688CC18D44F7B3F82202BCD0DF00775D8/fulltext/pdf

DOI: 10.1002/smll.201200417

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Le document en format XML

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<author><name sortKey="Cuenot, Stephane" sort="Cuenot, Stephane" uniqKey="Cuenot S" first="Stéphane" last="Cuenot">Stéphane Cuenot</name>
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<author><name sortKey="Radji, Sadia" sort="Radji, Sadia" uniqKey="Radji S" first="Sadia" last="Radji">Sadia Radji</name>
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<author><name sortKey="Alem, Halima" sort="Alem, Halima" uniqKey="Alem H" first="Halima" last="Alem">Halima Alem</name>
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<author><name sortKey="Demoustier Hampagne, Sophie" sort="Demoustier Hampagne, Sophie" uniqKey="Demoustier Hampagne S" first="Sophie" last="Demoustier-Champagne">Sophie Demoustier-Champagne</name>
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<author><name sortKey="Demoustier Hampagne, Sophie" sort="Demoustier Hampagne, Sophie" uniqKey="Demoustier Hampagne S" first="Sophie" last="Demoustier-Champagne">Sophie Demoustier-Champagne</name>
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<profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Acros</term>
<term>Alcohol groups</term>
<term>Atomic force microscopy</term>
<term>Average value</term>
<term>Chain length</term>
<term>Chem</term>
<term>Colloid interface</term>
<term>Cuenot</term>
<term>Cylindrical shape</term>
<term>Diblock copolymer chains</term>
<term>Diblock copolymers</term>
<term>Different polymerization times</term>
<term>Different polymers</term>
<term>Different positions</term>
<term>Encapsulated drugs</term>
<term>Experimental data</term>
<term>Experimental dispersion</term>
<term>Experimental section</term>
<term>Force curves</term>
<term>Force spectroscopy experiments</term>
<term>Force spectroscopy measurements</term>
<term>Full papers</term>
<term>Functionalized membranes</term>
<term>Gmbh</term>
<term>High degree</term>
<term>Hydrogel</term>
<term>Individual nanogels</term>
<term>Jonas</term>
<term>Kgaa</term>
<term>Macroscopic pnipam</term>
<term>Membrane</term>
<term>Membrane dissolution</term>
<term>Nano lett</term>
<term>Nanogel</term>
<term>Nanogel volume</term>
<term>Nanogels</term>
<term>Nanometer scale</term>
<term>Nanometersized objects</term>
<term>Nanopores</term>
<term>Nanotube</term>
<term>Other words</term>
<term>Phys</term>
<term>Physical density</term>
<term>Pnipam</term>
<term>Pnipam brushes</term>
<term>Pnipam chain length</term>
<term>Pnipam chains</term>
<term>Pnipam microparticles</term>
<term>Polymer</term>
<term>Polymer brush</term>
<term>Polymer chain length</term>
<term>Polymer chains</term>
<term>Polymerization time</term>
<term>Pore</term>
<term>Pore diameter</term>
<term>Previous work</term>
<term>Responsive nanogels</term>
<term>Responsive properties</term>
<term>Rupture length</term>
<term>Rupture lengths</term>
<term>Same nanogel</term>
<term>Several nanogels</term>
<term>Similar measurements</term>
<term>Statistical nature</term>
<term>Swollen state</term>
<term>Synthesis method</term>
<term>Synthesis time</term>
<term>Synthetic hydrogels</term>
<term>Template method</term>
<term>Thermodynamics theory</term>
<term>Thermoresponsive</term>
<term>Thermoresponsive nanogels exhibit</term>
<term>Total energy</term>
<term>Transition temperature</term>
<term>Typical spring</term>
<term>Verlag</term>
<term>Verlag gmbh</term>
<term>Volume change</term>
<term>Water temperature</term>
<term>Weinheim</term>
<term>Whole length</term>
</keywords>
<keywords scheme="Teeft" xml:lang="en"><term>Acros</term>
<term>Alcohol groups</term>
<term>Atomic force microscopy</term>
<term>Average value</term>
<term>Chain length</term>
<term>Chem</term>
<term>Colloid interface</term>
<term>Cuenot</term>
<term>Cylindrical shape</term>
<term>Diblock copolymer chains</term>
<term>Diblock copolymers</term>
<term>Different polymerization times</term>
<term>Different polymers</term>
<term>Different positions</term>
<term>Encapsulated drugs</term>
<term>Experimental data</term>
<term>Experimental dispersion</term>
<term>Experimental section</term>
<term>Force curves</term>
<term>Force spectroscopy experiments</term>
<term>Force spectroscopy measurements</term>
<term>Full papers</term>
<term>Functionalized membranes</term>
<term>Gmbh</term>
<term>High degree</term>
<term>Hydrogel</term>
<term>Individual nanogels</term>
<term>Jonas</term>
<term>Kgaa</term>
<term>Macroscopic pnipam</term>
<term>Membrane</term>
<term>Membrane dissolution</term>
<term>Nano lett</term>
<term>Nanogel</term>
<term>Nanogel volume</term>
<term>Nanogels</term>
<term>Nanometer scale</term>
<term>Nanometersized objects</term>
<term>Nanopores</term>
<term>Nanotube</term>
<term>Other words</term>
<term>Phys</term>
<term>Physical density</term>
<term>Pnipam</term>
<term>Pnipam brushes</term>
<term>Pnipam chain length</term>
<term>Pnipam chains</term>
<term>Pnipam microparticles</term>
<term>Polymer</term>
<term>Polymer brush</term>
<term>Polymer chain length</term>
<term>Polymer chains</term>
<term>Polymerization time</term>
<term>Pore</term>
<term>Pore diameter</term>
<term>Previous work</term>
<term>Responsive nanogels</term>
<term>Responsive properties</term>
<term>Rupture length</term>
<term>Rupture lengths</term>
<term>Same nanogel</term>
<term>Several nanogels</term>
<term>Similar measurements</term>
<term>Statistical nature</term>
<term>Swollen state</term>
<term>Synthesis method</term>
<term>Synthesis time</term>
<term>Synthetic hydrogels</term>
<term>Template method</term>
<term>Thermodynamics theory</term>
<term>Thermoresponsive</term>
<term>Thermoresponsive nanogels exhibit</term>
<term>Total energy</term>
<term>Transition temperature</term>
<term>Typical spring</term>
<term>Verlag</term>
<term>Verlag gmbh</term>
<term>Volume change</term>
<term>Water temperature</term>
<term>Weinheim</term>
<term>Whole length</term>
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<front><div type="abstract" xml:lang="en">The volume phase transition (VPT) behavior and the swelling properties of individual thermoresponsive poly(N‐isopropylacrylamide) (PNIPAM)‐based nanogels are investigated by in situ atomic force microscopy (AFM). Using a template‐based synthesis method, cylindrical nanogels are synthesized for different polymerization times within nanopores (80 nm) of poly(ethylene terephthalate) (PET) track‐etched membranes. The confinement conditions, characterized by the ratio Φ between the average chain length and the pore diameter, are varied between 0.35 and 0.8. After dissolving the membranes, the volume of individual nanogels composed of PNIPAM‐g‐PET diblock copolymers is numerically extracted from AFM images while varying the water temperature from 28 to 44 °C. From the measured volumes, the swelling of nanogels is investigated as a function of both the water temperature and the confinement conditions imposed during the synthesis. Contrary to the VPT, the maximum swelling of the nanogels is strongly affected by these confinement conditions. The volume of nanogels in the swollen state can reach 1.1 to 2.1 times their volume in the collapsed state for a ratio Φ of 0.8 and 0.5, respectively. These results open a new way to tune the swelling of nanogels, simply by adjusting the degree of confinement imposed during their synthesis within nanopores, which is particularly interesting for biomedical applications requiring a high degree of control over swelling properties, such as drug‐delivery nanotools.</div>
</front>
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Control of Swelling of Responsive Nanogels by Nanoconfinement

Control of Swelling of Responsive Nanogels by Nanoconfinement

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Descripteurs français

English descriptors

Abstract

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Links to Exploration step

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