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In situ generation of ZnO nanoparticles within a polyethyleneimine matrix for antibacterial zein fibers

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journal contribution
posted on 18.01.2021, 14:59 authored by Leno Mascia, Wanwei Zhang, Francesca Gatto, Alice Scarpellini, Pier Paolo Pompa, Elisa MeleElisa Mele
In this study the potential of branched polyethyleneimine (PEI) was explored for the in situ generation of ZnO nanoparticles and the electrospinning of zein-based fibers. Zinc acetyl acetonate dihydrate (ZnAcAc·2H2O) was chosen as the precursor for the related sol–gel reactions, leading to the nucleation and growth of wurtzite crystals within the PEI matrix. Control experiments showed that PEI played a vital role in the reaction steps leading to the conversion. Wide angle X-ray diffraction analysis confirmed the crystallographic structure of the ZnO particles formed, while scanning electron microscopy examinations revealed the formation of agglomerates less than 400 nm, made up of much smaller primary nanoparticles. The obtained ZnO/PEI microsuspensions in ethanol were mixed in an ethanol/water solution of zein and used for electrospinning of different types of zein-modified fibers. Differential scanning calorimetry analysis showed that PEI acted as a plasticizer for zein, causing also a broadening of the glass transition, while Fourier-transform infrared spectroscopy indicated that the amine groups in PEI interacted with the surface groups of ZnO crystals. The results provide useful insights for formulating fibers, films, and coatings exhibiting antibacterial characteristics, as well as higher mechanical flexibility and toughness relative to plain zein.

Funding

Rosetrees Trust (Grant JS16/M715)

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

ACS Applied Polymer Materials

Volume

1

Issue

7

Pages

1707 - 1716

Publisher

American Chemical Society

Version

AM (Accepted Manuscript)

Rights holder

© American Chemical Society

Publisher statement

This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Polymer Materials, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsapm.9b00276.

Acceptance date

06/06/2019

Publication date

2019-06-06

Copyright date

2019

ISSN

2637-6105

eISSN

2637-6105

Language

en

Depositor

Dr Elisa Mele. Deposit date: 16 January 2021

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