Influence of drying method on the surface energy of cellulose nanofibrils determined by inverse gas chromatography

Peng, Yucheng; Gardner, Douglas J.; Han, Yousoo; Cai, Zhiyong; Tshabalala, Mandla A.

doi:10.1016/j.jcis.2013.05.033

Cited by 87 publications

(84 citation statements)

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“…K A and K B values of the samples were calculated using the DG SP values of polar probes at that particular surface coverage. Consistent with the literature (Tze et al 2006;Pommet et al 2008;Peng et al 2013), the K B for both samples was consistently higher than K A , indicating that the samples possess higher concentrations of electron-donating (basic) surface functional groups than electron-withdrawing (acidic) ones. The higher specific Gibbs Free Energy of acidic probe (like acetone) indicates the domination of electron donating groups on the surface.…”

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confidence: 89%

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Surface properties and porosity of highly porous, nanostructured cellulose II particles

et al. 2016

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Recently, a new member of the nanocellulose family was introduced, a cellulose II gel consisting of nanostructured and spherical particles. In this study, we compared two different drying techniques to obtain highly porous powders from this gel with preserved meso-and macroporous nanostructure: first, freeze-drying after solvent exchange to tBuOH and second, supercritical drying of the respective EtOH alcogel. The approaches yielded aerogel powders with surface areas of 298 and 423 m 2 /g, respectively. Both powders are amphiphilic and possess energetically heterogeneous surfaces with dominating dispersive term of the surface energy in the range of 50-52 mJ/m 2 , as determined by a combination of physicochemical surface characterization techniques, such as iGC, BET and SEM. Despite the lower surface area, the cheaper and more widespread method, freeze-drying, yields a more polar and reactive cryogel.Keywords Nanocellulose Á Lyocell Á Inverse gas chromatography Á Thermoporosimetry Á Freezedrying Á Supercritical drying Abbreviations CNFCellulose nanofibrils FD Freeze-drying scCO 2 Supercritical CO 2 Electronic supplementary material The online version of this article

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confidence: 89%

“…Consistent with the Lindman hypothesis, both samples are amphoteric (Lindman et al 2010) (Table S1), both powders feature higher dispersive surface energies than cotton (Kondor et al 2015) and lyocell fibers (Tze et al 2006) and are comparable to TEMPO-oxidized and genuine CNF (Peng et al 2013;Gamelas et al 2015).…”

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confidence: 75%

Surface properties and porosity of highly porous, nanostructured cellulose II particles

et al. 2016

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“…The visible spectra of the NFC suspensions in the transmittance mode (Fig. 1) Please, insert Table 1 Please, insert Figure 1 The dispersion component of the surface energy ( s d ) at 40 ºC of the studied nanocelluloses was in the range of 42-52 mJ m -2 and was found to increase in the following order: NFC-5p < NFC-15p < enzymatic nanocellulose ( Please, insert Table 2 The slight increase of s d from NFC-5p to NFC-15p can be related to the aforementioned increase of the fibrillation, since a more nanofibrillated material will have a larger number of hydroxyl groups, which are considered to have a major contribution to the dispersion component of the surface energy of cellulose [18,25], accessible on the surface for interaction with the IGC apolar probes. The differences in the s d values between the TEMPO-oxidised nanocelluloses and the enzymatic nanocellulose can partly be due to the different crystallinity of the nanocelullose samples.…”

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confidence: 99%

“…Not many papers reported the use of IGC to analyse nanocellulose [15][16][17][18][19]. In particular, under infinite dilution conditions, the dispersion component of the surface energy was determined for cellulose nanofibers obtained by enzymatic pre-treatments [15] and cellulose nanofibers extracted from hemp fibre by acid hydrolysis [16].…”

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Surface properties of distinct nanofibrillated celluloses assessed by inverse gas chromatography

Gamelas

Pedrosa

Lourenço

et al. 2015

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Surface properties of distinct nanofibrillated celluloses assessed by inverse gas chromatography, Colloids and Surfaces A: Physicochemical and Engineering Aspects (2015), http://dx.doi.org/10.1016/j.colsurfa. 2014.12.058 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. Higher specific interactions with polar probes were found for enzymatic nanocellulose. The higher values of s d and specific interactions observed for the enzymatic nanocellulose could partly be due to the higher crystallinity of this sample. On the other hand, the increase of the acidity/basicity ratio (as well as of the s d value) for the 15-passes vs. 5-passes TEMPO nanofibres was attributed to a higher exposition of the hydroxyl groups of cellulose at the surface of the former material.

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Cellulose Nanofibrils: From Hydrogels to Aerogels

Beaumont

Potthast

Rosenau

2018

Cellulose Science and Technology

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Influence of drying method on the surface energy of cellulose nanofibrils determined by inverse gas chromatography

Cited by 87 publications

References 46 publications

Surface properties and porosity of highly porous, nanostructured cellulose II particles

Surface properties and porosity of highly porous, nanostructured cellulose II particles

Surface properties of distinct nanofibrillated celluloses assessed by inverse gas chromatography

Cellulose Nanofibrils: From Hydrogels to Aerogels

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