Cellulose nanowhisker aerogels

Heath, L. A. F.; Thielemans, Wim

doi:10.1039/c0gc00035c

Cited by 332 publications

(236 citation statements)

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“…There was not a clear correlation between the BET surface area and bagasse concentration in DMSO/LiCl in the range of 3-7 %. The similar results were reported in the preparation of cellulose nanowhisker aerogels (Heath and Thielemans 2010). However, the increase of bagasse concentration from 7 to 10 % led to a decrease in BET surface area from 185 to 119 m 2 / g. Because BET surface area describes the area accessible to gas adsorption and is dependent on the extent of aggregation of bagasse (Heath et al 2013), the noticeable decrease of BET surface area suggested the significant bagasse aggregation at bagasse concentration 10 %.…”

Section: Nitrogen Adsorption Analysissupporting

confidence: 68%

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Direct preparation of green and renewable aerogel materials from crude bagasse

Chen

Zhang

et al. 2016

Cellulose

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Lignocellulosic biomass aerogels with relatively high Brunauer-Emmett-Teller (BET) surface area and pore volume were prepared directly from bagasse solutions in the present study. Bagasse was dissolved in DMSO/LiCl, treated with cyclic freezingthawing processes, and regenerated with water. The resulted bagasse hydrogels were solvent-exchanged to t-butanol and subjected to freeze-drying to obtain the lignocellulosic aerogels. The structure of the aerogels was studied with FTIR, nitrogen absorption, SEM, and XRD. The results showed that the aerogels had sheetlike skeletons interconnected with one another to form three-dimensional networks. The highest BET surface area and total pore volume of the aerogels were 185 m 2 /g and 0.46 cm 3 /g, respectively. By adjusting the concentration of bagasse solution in DMSO/LiCl, the structure of the aerogels could be controlled to some extent.

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Section: Nitrogen Adsorption Analysissupporting

confidence: 68%

“…Porosity, density and shrinkage of bagasse aerogel were determined according to a previous study (Heath and Thielemans 2010) using an analytical balance (0.1 mg accuracy), a digital calliper (0.001 mm accuracy) and a measuring cylinder (0.1 mL accuracy). The volume of 10 g bagasse solution (V s ) was 8.90 mL.…”

Section: Characterizationmentioning

confidence: 99%

Direct preparation of green and renewable aerogel materials from crude bagasse

Chen

Zhang

et al. 2016

Cellulose

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“…41 The isotherms for dry CNC-1 ( Figure S2) resembled those for IUPAC type IIa isotherms and gave a value of 1.29 ± 0.10 m 2 /g for the specific surface area. Note that this is more than 2 orders of magnitude lower than values estimated from the average particle size (e.g., 419 m 2 /g was calculated for CNCs with dimensions of 6 nm × 6n m× 180 nm 17 ) and indicates that the large aggregates or agglomerates (dimensions of micrometers or larger) found in dry CNC 33,42,43 have a very low accessible surface area. The importance of agglomeration during drying has also been noted in studies of surface areas for other types of cellulose materials.…”

Section: ■ Experimental Sectionmentioning

confidence: 70%

“…The tendency of dry CNCs to form large and tightly packed aggregates has so far limited estimates of their surface area to calculations based on average particle size. 17 Here we report a detailed study of particle size distributions for CNC suspensions by atomic force microscopy (AFM), transmission electron microscopy (TEM), and dynamic light scattering (DLS), examining the effect of particle selection and sonication on the results obtained. This study highlights some of the issues that are important both for obtaining reproducible and comparable data from the various methods and for establishing statistical differences between samples.…”

Section: ■ Introductionmentioning

confidence: 99%

Correlating Cellulose Nanocrystal Particle Size and Surface Area

Brinkmann¹,

Chen²,

Couillard³

et al. 2016

Langmuir

147

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Vous avez des questions? Nous pouvons vous aider. Pour communiquer directement avec un auteur, consultez la première page de la revue dans laquelle son article a été publié afin de trouver ses coordonnées. Si vous n'arrivez pas à les repérer, communiquez avec nous à PublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. Questions? Contact the NRC Publications Archive team atPublicationsArchive-ArchivesPublications@nrc-cnrc.gc.ca. If you wish to email the authors directly, please see the first page of the publication for their contact information. NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1021/acs.langmuir.6b01376Access and use of this website and the material on it are subject to the Terms and Conditions set forth at Correlating cellulose nanocrystal particle size and surface area Brinkmann, Andreas; Chen, Maohui; Couillard, Martin; Jakubek, Zygmunt J.; Leng, Tianyang; Johnston, Linda J.http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/droits L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. NRC Publications Record / Notice d'Archives des publications de CNRC:http://nparc.cisti-icist.nrc-cnrc.gc.ca/eng/view/object/?id=df1fceea-c08d-4b99-8897-d9370e2db3c7 http://nparc.cisti-icist.nrc-cnrc.gc.ca/fra/voir/objet/?id=df1fceea-c08d-4b99-8897-d9370e2db3c7Correlating Cellulose Nanocrystal Particle Size and Surface Area ABSTRACT: Cellulose nanocrystals (CNCs) are negatively charged nanorods that present challenges for characterization of particle size distribution and surface areatwo of the common parameters for characterizing nanomaterials. CNC size distributions have been measured by two microscopy methods: atomic force microscopy (AFM) and transmission electron microscopy (TEM). The agreement between the two methods is good for length measurements, after taking into consideration tip-convolution effects for AFM. However, TEM widths are almost twice as large as AFM heightsan effect that we hypothesize is due to counting of a larger fraction of laterally associated CNCs in the TEM images. Overall, the difficulty of selecting individual particles for analysis and possible bias due to selection of a specific particle size during sample deposition are the main limitations associated with the microscopy measurements. The microscopy results were compared to Zaverage data from dynamic light scattering, which is a useful method for routine analysis and for examining trends in size as a function of sample treatment. Measurements as a function of sonication energy...

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“…Owing to a high aspect ratio, commercial CNCs tend to become arranged in highly porous structures post drying from aqueous dispersions [69], with atmospheric drying resulting in rigid nano-porous films [70]. Early discussions identified this issue on account of its potential in increasing product density and thermal conductivity.…”

Section: Cellulosic-crystal Preparationmentioning

confidence: 99%

Cellulosic-crystals as a fumed-silica substitute in vacuum insulated panel technology used in building construction and retrofit applications

Tetlow

Simon

Liew

et al. 2017

Energy and Buildings

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Cellulosic-crystals as a fumed-silica substitute in vacuum insulated panel technology used in building construction and retrofit applications, Energy and Buildingshttp://dx.doi.org/10. 1016/j.enbuild.2017.08.058 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractThis article investigates impact of substituting fumed silica with a cellulosic-crystal innovation in a commercial Vacuum Insulated Panel (VIP) core. High building performance demands have attracted VIP technology investment to increase production capacity and reduce cost. In building retrofit VIPs resolve practical problems on space saving that conventional insulations are unsuitable for. Three challenges exists in fumed silica: cost, low sustainability properties, and manufacture technical maturity. Cellulosic nano-crystal (CNC) technology is in its infancy and was identified as a possible alternative due to a similar physical nano-structure, and biodegradability. The study aim was to determine a performance starting point and establish how this compares with the current benchmarks. Laboratory cellulosic-crystal samples were produced and supplied for incorporation into commercial VIP manufacture. A selection of cellulosic-panels with core densities ranging 127 -170 kg/m 3 were produced. Thermal conductivities were tested at a pressure of 1 Pa (0.01 mBar), with the results compared against a selection of fumed silica-VIPs with core densities ranging 144 -180 kg/m 3 . Conductivity tests were then done on a cellulosic-VIP with 140 kg/m 3 density, under variable pressures ranging 1 -100,000 Pa (0.01 -1000 mBar). This investigated panel lifespan performance, with comparisons made to a fumed silica-VIP of similar core density. Manufactured cellulosic-samples were found unsuitable as a commercial substitute, with performance below current standards. Areas for cellulosic nano-material technology development were identified that show large scope for improvement. Pursuit could create a new generation of insulation materials that resolve problems associated with current commercial versions. This is most applicable in building retrofit where large ranges of domestic and commercial cases are marginalised from their construction markets due to impracticalities and high upgrade costs. This being a problem in multiple economies globally. Figure 3 with typical layer thicknesses [1,13].VIP thermal conductivities are five to ten times lower than commercial insulations, with the centreof-panel reaching 4 mW/m.K [3,4,14,16]. Albeit excellent performance, the technology is expensive with panel prices multiples of five to ten that of standard insulations [...

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Cellulose nanowhisker aerogels

Cited by 332 publications

References 32 publications

Direct preparation of green and renewable aerogel materials from crude bagasse

Direct preparation of green and renewable aerogel materials from crude bagasse

Correlating Cellulose Nanocrystal Particle Size and Surface Area

Cellulosic-crystals as a fumed-silica substitute in vacuum insulated panel technology used in building construction and retrofit applications

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