NDLI: A fundamental investigation of the microarchitecture and mechanical properties of tempo-oxidized nanofibrillated cellulose (NFC)-based aerogels

Content Provider	Springer Nature Link
Author	Silva, Teresa Cristina Fonseca Habibi, Youssef Colodette, Jorge Luiz Elder, Thomas Lucia, Lucian A.
Copyright Year	2012
Abstract	Freeze-dried nanofibrillated cellulose based-aerogels were produced from cellulosic pulps extracted from Eucalyptus urograndis. Nanofibers were isolated under high pressure and modified with TEMPO-mediated oxidation and/or hydroxyapatite (HAp) to observe potential changes in mechanical properties. Two degrees of oxidation (DO), 0.1 and 0.2, were achieved as measured by conductimetric titration. Oxidized and non-oxidized samples were modified with HAp at a ratio of HAp:cellulose of 0.2:1. Morphology (FE-SEM), pore size, surface area, and mechanical properties were obtained to characterize the produced aerogels. The results clearly demonstrate a homogeneous morphology for aerogels fabricated with oxidized cellulose nanofibers. The nature of water present in the material was measured using time domain-nuclear magnetic resonance spectroscopy (TD-NMR) and demonstrated that it played a key role in the development of the porous and uniform micro-architecture. TEMPO-mediated oxidation and the addition of HAp resulted in aerogels with high mechanical strength as demonstrated from an increase from approximately 75–200 kPa in compressive strength when reduced to 50 % of their original height. However, the contribution of oxidation to the mechanical properties was more pronounced than the addition of HAp. In general, the density of the aerogels varied from 0.008 to 0.011 g/cm3 in which slightly lightweight aerogels were produced by increasing the degree of oxidation, whereas the incorporation of HAp as a modifying agent for potential bio-based tissue scaffolding matrices did not significantly contribute to higher densities.
Starting Page	1945
Ending Page	1956
Page Count	12
File Format	PDF
ISSN	09690239
Journal	Cellulose
Volume Number	19
Issue Number	6
e-ISSN	1572882X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-08-15
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	NFC Aerogels TEMPO Hydroxyapatite Bioorganic Chemistry Physical Chemistry Polymer Sciences Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Polymers and Plastics

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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