Dual Stimuli‐Responsive Ternary Core‐Shell Polystyrene@Pnipam‐Pedot Latexes

Author:

Vretik Lyudmyla O.1,Noskov Yuriy V.2,Chepurna Oksana M.34,Ogurtsov Nikolay A.2,Nikolaeva Olena A.1,Marynin Andrii I.5,Ohulchanskyy Tymish Y.3,Pud Alexander A.2ORCID

Affiliation:

1. Taras Shevchenko National University of Kyiv Volodymyrska Str. 64/13 Kyiv 01601 Ukraine

2. V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry of NAS of Ukraine Kharkivske shoes 50 Kyiv 02160 Ukraine

3. College of Physics and Optoelectronic Engineering Shenzhen University Shenzhen Guangdong 518060 P. R. China

4. Department of Neurosurgery Cedars‐Sinai Medical Center Los Angeles CA 90048 USA

5. National University of Food Technologies Volodymyrska Str. 68 Kyiv 01601 Ukraine

Abstract

AbstractThe ability of stimuli‐responsive materials to respond to external stimuli depends on their intra‐ and intermolecular interactions, which, in turn, are governed by changes in the material composition. Here, the importance of these factors for new heat and light‐sensitive latexes of core‐shell nanoparticles is reported with the polystyrene core, the poly(N‐isopropylacrylamide) (PNIPAM) shell containing doped poly(3,4‐ethylenedioxythiophene) (PEDOT). It is found that hydrogen bonding, C═O─π aromatic, hydrophilic‐hydrophobic interactions in the shell cause conformational changes in PNIPAM similar to those occurring in the PNIPAM coil‐globule transition. Depending on the EDOT:PS@PNIPAM feed ratio and the PEDOT content in PNIPAM shells, these interactions and changes affect nanoparticle sizes and are responsible for shifting the lower critical solution temperature (LCST) of PNIPAM in the shell from 32.1 to 33.9 °C. The core‐shell morphology of nanoparticles is maintained only for latexes with EDOT feed to ≈9 wt.%. At the higher EDOT content, PNIPAM shells are destroyed. Synthesized PS@PNIPAM‐PEDOT latexes demonstrate temperature‐dependent behavior and produce a photothermal effect under NIR irradiation, which allows for a rise of their temperature above LCST. This dual stimuli (heat and light) responsiveness suggests an important possibility for these latexes to be used for drug or diagnostic agent delivery.

Funder

National Natural Science Foundation of China

Publisher

Wiley

Subject

Condensed Matter Physics,General Materials Science,General Chemistry

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