Macromol. Mater. Eng. 9/2010

Blomfeldt, Thomas; Olsson, Richard T.; Menon, Mohan; Plackett, David; Johansson, Eva; Hedenqvist, Mikael S.

doi:10.1002/mame.201090016

Cited by 14 publications

(40 citation statements)

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“…With reference to our system, ε scales inversely with the molecular weight of the alcohol used, equalling 32.6, 24.55, and 18.3 for methanol, ethanol, and 2-propanol, respectively. This was explained by the fact that the hydrolysed TEOS (Si(OH) 4 ) concentration never exceeded the critical limiting super saturation concentration, thus only growth onto already formed surfaces occured. ethanol and 2-propanol 39,45 .…”

Section: Reaction Conditions For Efficient Silica Coatingmentioning

confidence: 99%

“…From an engineering perspective, thermally stable CNFs could be used as filler for reinforcement in polymers processed at higher temperatures, but also in the development of porous and more heat resistant bio-based insulation materials [1][2][3][4][5][6] . From an engineering perspective, thermally stable CNFs could be used as filler for reinforcement in polymers processed at higher temperatures, but also in the development of porous and more heat resistant bio-based insulation materials [1][2][3][4][5][6] .…”

Section: Introductionmentioning

confidence: 99%

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Cellulose nanofibril core–shell silica coatings and their conversion into thermally stable nanotube aerogels

Liu

Andersson

et al. 2015

J. Mater. Chem. A

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A facile water-based one-pot reaction protocol for obtaining 20 nm thick uniform silica coatings on cellulose nanofibrils (CNFs) are herein presented for the first time. The fully covering silica shells result in a thermal stability of the CNFs improved by ca. 70 °C and 50 °C under nitrogen and oxygen atmosphere, respectively. Heating of the core-shell hybrid fibres to 400 °C results in complete degradation/removal of the CNF cores, and demonstrates an inexpensive route to large-scale preparation of silica nanotubes with the CNFs used as templates. The key to a uniform condensation of the silica (from tetraethyl orthosilicate) to the cellulose is a reaction medium that permits in-situ nucleation and growth of the silica phase on the fibrils, while simultaneously matching the quantity of the condensed silica with specific surface area of the CNFs. Most coatings were applied to bundles of 2-3 associated CNFs, which could be discerned from their negative imprint that remained inside the silica nanotubes. Finally, it is demonstrated how the coated nanofibrils can be freeze-dried into highly porous associated silica/cellulose aerogels with a density of 0.005 g/cm 3 and how these hybrid aerogels preserve their shape when extensively exposed to 400 °C under air (>6 h). The resulting material is the first reported silica nanotube aerogel obtained by using cellulose nanofibrils as templates.

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Section: Reaction Conditions For Efficient Silica Coatingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cellulose nanofibril core–shell silica coatings and their conversion into thermally stable nanotube aerogels

Liu

Andersson

et al. 2015

J. Mater. Chem. A

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“…WG is a by‐product from starch production and is at present mainly used in the bakery industry and as animal feed. WG is an elastomeric protein which possesses unique visco‐elastic and cohesive properties, making it suitable for material applications, such as films for food packaging, foams, and wood adhesives . WG is further readily available in large volumes since it is a by‐product from the bio‐ethanol production based on wheat.…”

Section: Introductionmentioning

confidence: 99%

Wheat-Gluten-Based Adhesives for Particle Boards: Effect of Crosslinking Agents

Khosravi

Khabbaz

Nordqvist

et al. 2013

Macromol. Mater. Eng.

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WG proteins show potential as environmentally friendly replacements for amino/formaldehyde resins in particle boards. The performance of WG dispersions in combination with crosslinkers as adhesives for particle boards is studied. The WG dispersions are prepared with sodium hydroxide or citric acid as the dispersing agent. Polyamidoamine‐epichlorohydrin (PAAE) and trimethylolpropane triacetoacetate (AATMP) are employed as crosslinkers. The performance of the WG dispersions and the crosslinkers are evaluated based on board properties, i.e., internal bond, thickness swelling, and water absorption. The results show an enhanced performance of WG using PAAE as crosslinker. The results reveal it is advantageous to disperse WG in sodium hydroxide compared to citric acid.

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“…1. (Lin, Li, Lu, & Cao, 2015), whereas the bulk density of wheat gluten-based aerogels ranged between 58 and 343 kg m -3 (Blomfeldt et al, 2010), therefore a wide range of values is to be expected. On the other hand, previously reported open-cell CNF foams and CNF aerogels had densities of 15 and 7-20 kg x m -3 , respectively (Jiang & Hsieh, 2014;Svagan, Samir, & Berglund, 2008), lower than the values we have found, so that different thermal values are to be expected.…”

Section: Determination Of Aerogels Pore Sizementioning

confidence: 99%

“Aerogels of enzymatically oxidized galactomannans from leguminous plants: Versatile delivery systems of antimicrobial peptides and enzymes”

Campia

Ponzini

Rossi

et al. 2017

Carbohydrate Polymers

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We describe aerogels obtained by laccase/TEMPO-oxidation and lyophilization of galactomannans (GM) from fenugreek, sesbania and guar. Enzymatic oxidation of GM in aqueous solution caused viscosity increase up to fifteen-fold, generating structured, elastic, stable hydrogels, presumably due to establishment of hemiacetalic bonds between newly formed carbonyl groups and free hydroxyl groups. Upon lyophilization, water-insoluble aerogels were obtained, whose mechanical properties and porosity were investigated. Active principles were absorbed into the aerogels from aqueous solutions and, following rinsing, blotting, re-lyophilization, were released in an appropriate medium. The release of the antibiotic polymyxin B was tested against six different Gram-negative bacterial strains, of the antimicrobial peptide nisin against two Gram-positive and of the muraminidase lysozyme against one anaerobic strain. Protease and lipase release in solution from "enzyme loaded" aerogels was monitored by the increase in enzymatic activity. These biomaterials could represent new versatile, biocompatible "delivery systems" of actives for biomedical and industrial applications.

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Macromol. Mater. Eng. 9/2010

Cited by 14 publications

References 0 publications

Cellulose nanofibril core–shell silica coatings and their conversion into thermally stable nanotube aerogels

Cellulose nanofibril core–shell silica coatings and their conversion into thermally stable nanotube aerogels

Wheat-Gluten-Based Adhesives for Particle Boards: Effect of Crosslinking Agents

“Aerogels of enzymatically oxidized galactomannans from leguminous plants: Versatile delivery systems of antimicrobial peptides and enzymes”

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