Advances in superporous hydrogels

Omidian, Hossein; Rocca, Jose G.; Park, Kinam

doi:10.1016/j.jconrel.2004.09.028

Cited by 392 publications

(242 citation statements)

References 15 publications

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“…[ 29 ] Conversely, under the same experimental conditions, unidirectional calcium diffusion resulted in alginate gels with an isotropic mesh structure ( Figure S8, Supporting Information), which suggests that F127 acts as an interfacial stabilizer during the formation of both large pores and aligned channels. [ 30 ] Rheology and compression testing revealed that the hybrid gel, before and after calcium crosslinking, had physical properties signifi cantly different to the equivalent neat alginate and F127 systems. A shear rate ramp performed on uncrosslinked hybrid gels at printing temperature ( T = 25 °C) showed a signifi cant decrease in viscosity with increased shear, producing a fl ow index ( n ) of 0.126 ± 0.001, which is indicative of a shear thinning material ( n < 1) ( Figure S9a, Supporting Information).…”

Section: Doi: 101002/adhm201600022mentioning

confidence: 98%

3D Bioprinting Using a Templated Porous Bioink

Armstrong

Burke

Carter

et al. 2016

Adv Healthcare Materials

163

111

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3D cell printing (bioprinting) is rapidly emerging as a key biofabrication strategy for engineering tissue constructs with physiological form and complexity. [1][2][3][4] In practice, this process involves layer-by-layer deposition of a cell-laden bioink resulting in the additive manufacture of a patterned architecture with different cell types, growth factors, or mechanical cues, which are positioned with far greater precision than can be achieved with conventional scaffold-based tissue engineering. [ 5 ] While there have been signifi cant advances in printing technology, [ 6,7 ] progress has been limited by the rate of development of bioinks that are compatible with both 3D printing and tissue engineering. [ 8 ] These materials must be able to withstand extrusion, maintain structural fi delity for long time periods, and permit adequate nutrient diffusion, all under cytocompatible conditions. Due to their intrinsic porosity and capacity for high nutrient loading, hydrogels are the most promising candidate for bioink design, [ 9 ] particularly when gelation can be externally triggered using chemical bonding, [ 10 ] photoinduced crosslinking, [ 11 ] thermal setting, [ 12 ] or shear-thinning. [ 13 ] However, integrating these factors into a system while maintaining printability, structural persistence, and cell viability, is an enduring challenge. [ 14 ] Pluronic block copolymers of poly(ethylene oxide-b-propylene oxide-b-ethylene oxide) present a possible pathway to print gelation, as they undergo a sol-gel transition upon heating near physiological temperatures. Here, elevating the temperature of these non-ionic surfactants reduces the

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Section: Doi: 101002/adhm201600022mentioning

confidence: 98%

3D Bioprinting Using a Templated Porous Bioink

Armstrong

Burke

Carter

et al. 2016

Adv Healthcare Materials

163

111

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“…Their work with measurement of ion diffusion rates, in addition to freeze-fracturing of hydrogels, led to the conclusion that the bulk-like water within hydrogels tended to be confined to isolated "lakes" within the pore structure. This finding suggests that various reported porous hydrogels or "foams" might be expected to contain substantial bulk-like water in addition to chemically bound water (Kabra et al 1998;Omidian et al 2005;Lu et al 2007;Chang et al 2009a,b;Sehaqui et al 2010;Salam et al 2011a). Joshi et al (2008) proposed that the relatively sharp gelation transition that takes place upon heating of methylcellulose solutions can be attributed to a thermal breakdown of the water structure, allowing coalescence of the polymer chains.…”

Section: Hydration and Hydrogen Bonding Effectsmentioning

confidence: 98%

“…It has been suggested that the lumens of cellulosic fibers can play a similar role in the wicking of water (Mizutani et al 1999). Capillary forces also have been credited with explaining the rapid absorption of aqueous fluids into some highly porous hydrogels (Omidian et al 2005). proposed that capillary forces also can increase the amount of water held within swollen hydrogels.…”

Section: Capillarity and The Lucas-washburn Equationmentioning

confidence: 99%

“…Thus, the goal of this review is to highlight published literature regarding enhanced absorbent materials and products that incorporate various forms of cellulose or its derivatives. Main sections are shown in the following table of contents: (Yoshinobu et al 1992;Kabra et al 1998;Omidian et al 2005;Lu et al 2007;Chang et al 2009a;Zamani et al 2010;Salam et al 2011a). However, even without employing SAP technologies (see later), it has been shown that substantial absorbency can be achieved by suitable preparation of highly porous cellulose or its chemical derivatives.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Absorbent Products Incorporating Cellulose and Its Derivatives: A Review

Hubbe¹,

Ayoub²,

Daystar³

et al. 2013

BioResources

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Cellulose and some cellulose derivatives can play vital roles in the enhancement of the performance of absorbent products. Cellulose itself, in the form of cellulosic fibers or nano-fibers, can provide structure, bulk, water-holding capacity, and channeling of fluids over a wide dimensional range. Likewise, cellulose derivatives such as carboxymethylcellulose (CMC) have been widely studied as components in superabsorbent polymer (SAP) formulations. The present review focuses on strategies and mechanisms in which inclusion of cellulose -in its various formscan enhance either the capacity or the rate of aqueous fluid absorption in various potential applications.

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“…The crosslinked structure of this polymer allows it to maintain a stable network even in its swollen state [2]. Acrylic monomers or polymers, polyacrylamide and other polyacrylates are the most widely chosen as the raw materials to form high performance superabsorbent materials [3][4][5][6][7][8][9]. SAP can also be associated with another class of compound or substances resulting in a composite superabsorbent polymers.…”

Section: Introductionmentioning

confidence: 99%