Macromol. Biosci. 9/2013

Montanari, Elita; Capece, Sabrina; Meo, Chiara Di; Meringolo, M.; Coviello, Tommasina; Agostinelli, Enzo; Matricardi, Pietro

doi:10.1002/mabi.201370029

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“…1 In general, these networks are either permanent (covalently cross-linked) or reversible (physically cross-linked). 2 Due to their rubbery nature, which is similar to soft tissues, hydrogels have been extensively explored during the past two decades and are widely used in diverse biomedical applications, such as biomimetic mineralization, 3 cancer therapy, 4 contact lenses, 5 scaffolds for tissue engineering, 6,7 vehicles for drug delivery, 7,8 coatings for medical devices, 9 and extracellular matrices for biosensors. 10 For certain applications, much attention has been given to the functionalities of hydrogels with a particular set of desired properties, such as self-healing ability, 11,12 DNA-inspired responsiveness, 13 magnetism, 14 degradability and renewability, 15,16 conductivity, 17,18 pH sensitivity, 18 and thermo-sensitivity.…”

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confidence: 99%

Facile and Green Approach towards Electrically Conductive Hemicellulose Hydrogels with Tunable Conductivity and Swelling Behavior

et al. 2014

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A one-pot reaction to synthesize electrically conductive hemicellulose hydrogels (ECHHs) is developed via a facile and green approach in water and at ambient temperature. ECHHs were achieved by cross-linking O-acetyl-galactoglucomannan (AcGGM) with epichlorohydrin in the presence of conductive aniline pentamer (AP) and were confirmed by infrared spectroscopy (IR) and elemental analysis. All hydrogels had macro-porous structures, and the thermal stability of ECHHs was improved by the addition of AP. Hydrogel equilibrium swelling ratios (ESRs) varied from 13.7 to 11.4 and were regulated by cross-linker concentration. The ESRs can also be tuned from 9.6 to 6.0 by changing the AP content level from 10 to 40% (w/w) while simultaneously altering conductivity from 9.05 × 10–9 to 1.58 × 10–6 S/cm. ECHHs with controllable conductivity, tunable swelling behavior, and acceptable mechanical properties have great potential for biomedical applications, such as biosensors, electronic devices, and tissue engineering.

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