Producing aerogels from silanized cellulose nanofiber suspension

Zanini, Márcia; Lavoratti, Alessandra; Lazzari, Lídia Kunz; Galiotto, Deise; Pagnocelli, Marlova; Baldasso, Camila; Zattera, Ademir J.

doi:10.1007/s10570-016-1142-4

Cited by 83 publications

(43 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The values found in the present work were similar to those found by Nguyen et al [7], who found density of 0.040 g.cm -3 , and porosity of 94.8% for aerogel with addition of 1.9% NaOH and 10% urea. Zanini et al [8] obtained 0.0644 g.cm -3 and 91% for aerogel with 2% NaOH addition, results which were much lower than the found results found by Gavillon and Butnova [9], who obtained density of 0.14 g.cm -3 , and porosity of 96% with the addition of 7.6% NaOH. Fig.…”

Section: Specific Mass and Porositymentioning

confidence: 69%

Analysis of Compression Resistance and Oil Adsorption Capacity of Cellulose/NaOH Cryogels

Lazzari¹,

Zampieri²,

Zattera³

et al. 2019

Journal of Renewable Materials

Self Cite

View full text Add to dashboard Cite

This work aimed at analyzing the petroleum adsorption capacity and the compressive strength of cellulose cryogels produced with the addition of 4 and 8% (w/w) sodium hydroxide (NaOH). Cryogels were produced from a 1.5% (m/m) suspension of cellulose microfibers, which originated from Pinus elliotti, in distilled water. The addition of NaOH increased the compression strength of cryogel by 30% when compared to cryogel without the reagent. Due to the 50% decrease in volume, the cryogel FLNB-8h (8% NaOH) has its petroleum adsorption capacity decreased in average by 58%, whereas the FLNB-4 (4% NaOH) cryogel had it only by 14%. The cellulose suspension which provided the best results for the properties of the cryogels tested had a 4% concentration of NaOH.

show abstract

Section: Specific Mass and Porositymentioning

confidence: 69%

Analysis of Compression Resistance and Oil Adsorption Capacity of Cellulose/NaOH Cryogels

Lazzari¹,

Zampieri²,

Zattera³

et al. 2019

Journal of Renewable Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…In order to obtain the aerogels' hydrophobic properties, a chemical treatment of the suspensions with the use of the methyltrimethoxysilane (MTMS) was carried out at a concentration of 2% in mass, according to our previous work [25]. The CNF suspension was filtered through a vacuum system.…”

Section: Production Of the Aerogelsmentioning

confidence: 99%

“…Zanini et al [25] obtained aerogels of bleached CNFs of Eucalyptus sp. with a sorption capacity in heterogeneous medium of 16.78 g•g −1 and an oil removal efficiency of 87.9%.…”

Section: Journal Of Nanomaterialsmentioning

confidence: 99%

See 1 more Smart Citation

Obtaining Hydrophobic Aerogels of Unbleached Cellulose Nanofibers of the Species Eucalyptus sp. and Pinus elliottii

Zanini

Lavoratti

Lazzari

et al. 2018

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

The use of natural fibers from renewable and biodegradable sources in oleophilic sorbents, such as cellulose, has become an interesting alternative due to their excellent properties and sustainability. In addition to that, the low density of the aerogels obtained from cellulose is favorable for their use as sorbents. In this context, the objective of this study is to develop hydrophobic aerogels of unbleached cellulose nanofibers of the Eucalyptus sp. and Pinus elliottii. Cellulose samples were submitted to mechanical fibrillation to obtain cellulose nanofiber suspensions, followed by a chemical treatment with methyltrimethoxysilane and dried by freeze-drying to prepare the aerogels. The aerogels presented hydrophobic and oleophilic characteristics, including a water contact angle of 134°, sorption capacities in a heterogeneous medium of above 21.0 g·g−1, and oil removal efficiency greater than 88.5%. The Pinus elliottii nanofiber aerogels showed higher compressive strength when compared to the nanofiber aerogels of Eucalyptus sp.

show abstract

“…Recently, the novel cellulose aerogels (also designated as cellulosic sponges or foam in the literature) based on CNF hydrogels have attracted considerable research interest due to their renewability, good mechanical properties, low density, high porosity, natural biodegradability, and environmental friendliness. These fascinating properties make it possible to use them as absorbents for oils and chemicals [6][7][8][9][10][11][12], for example. The aerogels can be prepared by freeze-drying the CNF hydrogel and removing all moisture while maintaining the porous, entangled 3D network structure of the CNFs.…”

Section: Introductionmentioning

confidence: 99%

Superabsorbent Aerogels from Cellulose Nanofibril Hydrogels

Laitinen¹,

Suopajärvi²,

Sirviö³

et al. 2018

Polymers and Polymeric Composites: A Reference Series

View full text Add to dashboard Cite

Deep eutectic solvents (DESs) are promising green chemicals that can function as solvents, reagents, and catalysts in many applications because of their biodegradability, ready availability, and low toxicity. Here, a DES of choline chloride-urea was used as a nonhydrolytic pretreatment medium to obtain cellulose nanofibril (CNF) hydrogels from recycled cellulose pulps (boxboard, milk containerboard, and fluting) and virgin birch cellulose pulp using a mechanical Masuko grinder. The mechanical disintegration of DES pretreated cellulose fibers resulted in highly viscous, gel-like cellulose nanofibril hydrogels with shear thinning behavior. According to transmission electron microscope (TEM) imaging, the nanofibrils had widths from 2 nm to 80 nm, possessed the initial cellulose I crystalline structure, and had a crystallinity index of 53-56%. The nanofibril hydrogels obtained were further used to produce low-cost, ultralight, highly porous, hydrophobic, and reusable superabsorbing aerogels that were used as efficient sponges to absorb oil and chemicals. The nanofibril sponges prepared by the consequent hydrophobic modification (silylation) of CNF hydrogels and freeze-drying had ultralow density (0.003 g/cm 3) and high porosity (up to 99.8%). The sponges exhibited excellent oil/water absorption selectivity and ultra-high oil (marine diesel oil, kerosene, gasoline, motor 2 oil, castor oil, or linseed oil) and organic solvent (dimethyl sulfoxide, chloroform, n-hexane, toluene, acetone, or ethanol) absorption capacity. The nanofibril aerogels showed particular selectivity for marine diesel oil absorption from an oil-water mixture and possessed ultra-high absorption capacities of up to 143 g/g, which were much higher than the commercial absorbent materials (i.e., polypropylenes) (9-27 g/g) used as references. Additionally, the absorbed oil could be recovered by means of simple mechanical squeezing, and the superabsorbent could be reused for at least 30 cycles.

show abstract

Producing aerogels from silanized cellulose nanofiber suspension

Cited by 83 publications

References 44 publications

Analysis of Compression Resistance and Oil Adsorption Capacity of Cellulose/NaOH Cryogels

Analysis of Compression Resistance and Oil Adsorption Capacity of Cellulose/NaOH Cryogels

Obtaining Hydrophobic Aerogels of Unbleached Cellulose Nanofibers of the Species Eucalyptus sp. and Pinus elliottii

Superabsorbent Aerogels from Cellulose Nanofibril Hydrogels

Contact Info

Product

Resources

About