Morphology of cross-linked cellulose nanocrystal aerogels: cryo-templating versus pressurized gas expansion processing

Osorio, Daniel A.; Seifried, Bernhard; Moquin, Paul; Grandfield, Kathryn; Cranston, Emily D.

doi:10.1007/s10853-018-2235-2

Cited by 31 publications

(27 citation statements)

References 53 publications

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“…Aerogels are three-dimensional network materials derived from gel networks by replacing the liquid medium with gas [ 1 ]. They show great promise for using as supporting substrate, owing to their high surface area, low density, high specific surface area, recyclability, biodegradability, low cost and aqueous stability [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

Morphological, Release and Antibacterial Performances of Amoxicillin-Loaded Cellulose Aerogels

Chen

et al. 2018

Molecules

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Cellulose has been widely used in the biomedical field. In this study, novel cellulose aerogels were firstly prepared in a NaOH-based solvent system by a facile casting method. Then amoxicillin was successfully loaded into cellulose aerogels with different loadings. The morphology and structure of the cellulose aerogels were characterized using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The drug release and antibacterial activities were also evaluated. The drug release results showed that cellulose aerogels have controlled amoxicillin release performance. In vitro antibacterial assay demonstrated that the cellulose aerogels exhibited excellent antibacterial activity with the amoxicillin dose-dependent activity. Therefore, the developed cellulose aerogels display controlled release behavior and efficient antibacterial performance, thus confirming their potential for biomedical applications.

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Section: Introductionmentioning

confidence: 99%

Morphological, Release and Antibacterial Performances of Amoxicillin-Loaded Cellulose Aerogels

Chen

et al. 2018

Molecules

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“…[33] The sCNCs were functionalized with aldehyde groups (aCNCs) using a sodium periodate (Sigma-Aldrich, Oakville, Canada) oxidation route as described in prior work. [34] The aCNCs generated had a z-average mean particle size of 92 ± 8 nm determined by dynamic light scattering (Malvern Zetasizer 3000, Malvern, UK, assuming spherical particle shape in the calculation and thus only used for relative comparison of size and to show good particle dispersion), zeta potential of −16 ± 2 mV (ZetaPlus Zeta Potential Analyzer, Brookhaven Instruments, Holtsville, NY), and an aldehyde functionalization content of 1.56 ± 0.09 mmol g −1 as determined by conductometric titration (VWR sympHony). Hydrazide functionalized CNCs (hCNCs) were produced as described previously [34] by first oxidizing sCNCs with 2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPO, Sigma-Aldrich).…”

Section: Methodsmentioning

confidence: 99%

Ultrathin‐Walled 3D Inorganic Nanostructured Networks Templated from Cross‐Linked Cellulose Nanocrystal Aerogels

Hiltunen

Lahtonen

et al. 2021

Adv Materials Inter

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“…34 The resulting CNCs had surface sulfate half ester groups (sCNCs) and were further functionalized with aldehyde groups (aCNCs) by using a sodium periodate (Sigma-Aldrich, Oakville, Canada) oxidation route as described in prior work. 35 The aCNCs generated had a z -average mean particle size of 92 ± 8 nm determined by dynamic light scattering (DLS, Malvern Zetasizer 3000, Malvern, UK), zeta potential of −16 ± 2 mV (ZetaPlus Zeta Potential Analyzer, Brookhaven Instruments, Holtsville, NY), and an aldehyde functionalization content of 1.56 ± 0.09 mmol/g as determined by conductometric titration 36 (VWR sympHony). Note that CNCs are rod-shaped, and DLS assumes spherical particles and as such is only used for relative comparison of size and to show good particle dispersion.…”

Section: Methodsmentioning

confidence: 99%

Cellulose Nanocrystal Aerogels as Electrolyte Scaffolds for Glass and Plastic Dye-Sensitized Solar Cells

Miettunen²,

Cranston

et al. 2019

ACS Appl. Energy Mater.

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The fabrication, thickness, and structure of aerogel films composed of covalently cross-linked cellulose nanocrystals (CNCs) and poly(oligoethylene glycol methacrylate) (POEGMA) were optimized for use as electrolyte absorbers in dye-sensitized solar cells (DSSCs). The aerogel films were cast directly on transparent conducting counter electrode substrates (glass and flexible poly(ethylene terephthalate) plastic) and then used to absorb drop-cast liquid electrolyte, thus providing an alternative method of filling electrolyte in DSSCs. This approach eliminates the use of electrolyte-filling holes, which are a typical pathway of electrolyte leakage, and furthermore enables a homogeneous distribution of electrolyte components within the photoelectrode. Unlike typical in situ electrolyte gelation approaches, the phase inversion method used here results in a highly porous (>99%) electrolyte scaffold with excellent ionic conductivity and interfacial properties. DSSCs prepared with CNC–POEGMA aerogels reached similar power conversion efficiencies as compared to liquid electrolyte devices, indicating that the aerogel does not interfere with the operation of the device. These aerogels retain their structural integrity upon bending, which is critical for their application in flexible devices. Furthermore, the aerogels demonstrate impressive chemical and mechanical stability in typical electrolyte solvents because of their stable covalent cross-linking. Overall, this work demonstrates that the DSSC fabrication process can be simplified and made more easily upscalable by taking advantage of CNCs, being an abundant and sustainable bio-based material.

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Morphology of cross-linked cellulose nanocrystal aerogels: cryo-templating versus pressurized gas expansion processing

Cited by 31 publications

References 53 publications

Morphological, Release and Antibacterial Performances of Amoxicillin-Loaded Cellulose Aerogels

Morphological, Release and Antibacterial Performances of Amoxicillin-Loaded Cellulose Aerogels

Ultrathin‐Walled 3D Inorganic Nanostructured Networks Templated from Cross‐Linked Cellulose Nanocrystal Aerogels

Cellulose Nanocrystal Aerogels as Electrolyte Scaffolds for Glass and Plastic Dye-Sensitized Solar Cells

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