Spongelike Functional Materials from
            <scp>TEMPO</scp>
            ‐Oxidized Cellulose Nanofibers

Fiorati, Andrea; Pastori, Nadia; Punta, Carlo; Melone, Lucio

doi:10.1002/9783527341009.ch4

Cited by 6 publications

(1 citation statement)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Obtaining aqueous dispersions of nano-dimensioned fibers is facilitated by the use of a ultra-sonication process [20][21][22][23]. TEMPO oxidized and ultra-sonicated cellulose nanofibers (TOUS-CNFs) have been reported as versatile building blocks for the design of nanostructured materials with a wide range of potential applications [24][25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

TEMPO-Nanocellulose/Ca2+ Hydrogels: Ibuprofen Drug Diffusion and In Vitro Cytocompatibility

et al. 2020

Self Cite

View full text Add to dashboard Cite

Stable hydrogels with tunable rheological properties were prepared by adding Ca2+ ions to aqueous dispersions of 2,2,6,6-tetramethylpiperidine 1-oxyl (TEMPO)-oxidized and ultra-sonicated cellulose nanofibers (TOUS-CNFs). The gelation occurred by interaction among polyvalent cations and the carboxylic units introduced on TOUS-CNFs during the oxidation process. Both dynamic viscosity values and pseudoplastic rheological behaviour increased by increasing the Ca2+ concentration, confirming the cross-linking action of the bivalent cation. The hydrogels were proved to be suitable controlled release systems by measuring the diffusion coefficient of a drug model (ibuprofen, IB) by high-resolution magic angle spinning (HR-MAS) nuclear magnetic resonance (NMR) spectroscopy. IB was used both as free molecule and as a 1:1 pre-formed complex with β-cyclodextrin (IB/β-CD), showing in this latter case a lower diffusion coefficient. Finally, the cytocompatibility of the TOUS-CNFs/Ca2+ hydrogels was demonstrated in vitro by indirect and direct tests conducted on a L929 murine fibroblast cell line, achieving a percentage number of viable cells after 7 days higher than 70%.

show abstract

Section: Introductionmentioning

confidence: 99%

TEMPO-Nanocellulose/Ca2+ Hydrogels: Ibuprofen Drug Diffusion and In Vitro Cytocompatibility

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

Naked‐Eye Heterogeneous Sensing of Fluoride Ions by Co‐Polymeric Nanosponge Systems Comprising Aromatic‐Imide‐Functionalized Nanocellulose and Branched Polyethyleneimine

Riva¹,

Fiorati²,

Sganappa³

et al. 2019

ChemPlusChem

Self Cite

View full text Add to dashboard Cite

Heterogeneous colorimetric sensors for fluoride ions were obtained by cross‐linking TEMPO‐oxidized cellulose nanofibers (TOCNF) with chemically modified branched polyethyleneimine 25 kDa (bPEI). Functionalization of bPEI primary amino groups with aromatic anhydrides led to the formation of the corresponding mono‐ and bis‐imides on the grafted polymers (f‐bPEI). A microwave‐assisted procedure allowed the optimization of the synthetic protocol by reducing reaction time from 17 h to 30 minutes. Hydrogels obtained by mixing different ratios of TOCNF, bPEI and f‐bPEI were lyophilized and thermally treated at about 100 °C to promote the formation of amide bonds between the amino groups of poly‐cationic polymers and the carboxylic groups of cellulose nanofibers. This approach generated a series of cellulose nanosponges S1‐S3 which were characterized by FT‐IR and by solid state 13C CPMAS NMR. These sponge materials can act as colorimetric sensors for the selective naked‐eye recognition of fluoride ions over chloride, phosphate and acetate ions at concentrations of up to 0.05 M in DMSO. Moreover, when the sponges were functionalized with perylene tetracarboxylic diimide, successful naked‐eye detection was achieved with only 0.02 % w/w of chromophore units per gram of material.

show abstract

Introduction to Sponge-Like Functional Materials from TEMPO-Oxidized Cellulose Nanofibers

Pooja,

Gupta,

Dutt

et al. 2023

Nanosponges for Environmental Remediation

View full text Add to dashboard Cite

Spongelike Functional Materials from TEMPO ‐Oxidized Cellulose Nanofibers

Cited by 6 publications

References 39 publications

TEMPO-Nanocellulose/Ca2+ Hydrogels: Ibuprofen Drug Diffusion and In Vitro Cytocompatibility

TEMPO-Nanocellulose/Ca2+ Hydrogels: Ibuprofen Drug Diffusion and In Vitro Cytocompatibility

Naked‐Eye Heterogeneous Sensing of Fluoride Ions by Co‐Polymeric Nanosponge Systems Comprising Aromatic‐Imide‐Functionalized Nanocellulose and Branched Polyethyleneimine

Introduction to Sponge-Like Functional Materials from TEMPO-Oxidized Cellulose Nanofibers

Contact Info

Product

Resources

About