Surface and Structure Characteristics, Self-Assembling, and Solvent Compatibility of Holocellulose Nanofibrils

Gu, Jin; Hsieh, You‐Lo

doi:10.1021/am5079489

Cited by 48 publications

(60 citation statements)

References 35 publications

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“…Optimized 2,2,6,6-tetramethylpyperidine-1-oxyl (TEMPO) oxidation coupled with mechanical blending produced much thinner (1−3 nm wide) and longer (up to 1 μm long) CNFs at an impressive 96.8% yield. 19,21,22 These CNCs and CNFs showed intriguing self-assembling behaviors that led to ultrafine fibers 23 and amphiphilic superabsorbent aerogels. 24,25 While chemical approaches generated most homogeneous CNCs and CNFs and excellent CNF yield when combined with mechanical blending from rice straw cellulose, mechanical blending alone usually led to low yields.…”

Section: ■ Introductionmentioning

confidence: 99%

Rice Straw Cellulose Nanofibrils via Aqueous Counter Collision and Differential Centrifugation and Their Self-Assembled Structures

Jiang

Kondo

Hsieh

2016

ACS Sustainable Chem. Eng.

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Rice straw cellulose was completely defibrillated via aqueous counter collision (ACC) at a low energy input of 15 kWh/kg, then fractionated by differential centrifugation into four increasing weight fractions of progressively thinner cellulose nanofibrils (CNFs): 6.9% in 80–200 nm, 14.4% in 20–80 nm, 20.3% in 5–20 nm, and 58.4% in less than 5 nm thickness. The 93.1% less than 80 nm or 78.7% less than 20 nm thick CNFs yields were more than double those from wood pulp by other mechanical means but at a lower energy input. The smallest (3.7 nm thick and 5.5 nm wide) CNFs were only a third or less in lateral dimensions than those obatined through ACC processed from wood pulp, bamboo, and microbial cellulose pellicle. The less than 20 nm thick CNFs could self-assemble into continuous submicron (136 nm) wide fibers by freezing and freeze-drying or semitransparent (13–42% optical transmittance) film by ultrafiltration and air-drying with excellent mechanical properties (164 MPa tensile strength, 4 GPa Young’s modulus, and 16% strain at break). ACC defibrillated CNFs retained essentially the same chemical and crystalline structures and thermal stability as the original rice straw cellulose and therefore were much more thermally stable than TEMPO oxidized CNFs and sulfuric acid hydrolyzed cellulose nanocrystals from the same rice straw cellulose.

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Section: ■ Introductionmentioning

confidence: 99%

Rice Straw Cellulose Nanofibrils via Aqueous Counter Collision and Differential Centrifugation and Their Self-Assembled Structures

Jiang

Kondo

Hsieh

2016

ACS Sustainable Chem. Eng.

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“…It was shown that this material yields nanopaper structures of high quality and optical transparency [8,9]. Residual hemicellulose in fibrillated holocellulose enables improved dispersion of MFC in non-polar solvent [10]. Moreover, holocellulose nanocrystals produced by acid hydrolysis are amphiphilic in surface-chemical terms and capable of stabilising oil-in-water emulsions [11].…”

Section: Introductionmentioning

confidence: 99%

Reduced polarity and improved dispersion of microfibrillated cellulose in poly(lactic-acid) provided by residual lignin and hemicellulose

et al. 2016

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The surface chemistry and dispersion in poly(lactic-acid) of microfibrillated wood and microfibrillated lignocellulose prepared from untreated and partially delignified beech were compared with conventional microfibrillated cellulose produced from bleached pulp. High heterogeneity in fibril morphology and bulk chemical composition was observed. Also surface chemistry of the fibrils was highly variable, but not clearly correlated with bulk chemistry. Composite solution-cast films of poly(lacticacid) reinforced with 1 % fibrils were produced by adding fibrils dried from solvent into a polymer solution. Highly variable dispersion of fibrils correlated with varying mechanical performance was observed. Correlations were obtained between surface chemistry of fibrils as revealed by X-ray photoelectron spectroscopy and adhesion force microscopy on the one hand and the tensile performance of the fibril-reinforced polymer composites on the other hand. Overall, certain variants of fibrillated material with residual lignin and hemicellulose content showed reduced surface polarity, improved dispersion in poly(lactic-acid) and improved reinforcement efficiency compared to conventional MFC produced from bleached pulp.

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“…The 3D porous PU foam is used as the template because it has mechanical and environmental stability. [37,38] Therefore, we integrated 3D structure of PU foam, oleophilic property and rough surface of GNs, and hydrophilic property of CNWs to construct a superamphiphilic foam (graphene@polyurethane foams, CGPFs) through a facile and green dip-coating process. CNWs, [33] extracted from natural fibers, are abundant biomass materials.…”

Section: Introductionmentioning

confidence: 99%

“…[34][35][36] Furthermore, cellulose nanofibers are used to fabricate amphiphilic materials because of coexisted hydrophilic and oleophilic groups. [37,38] Therefore, we integrated 3D structure of PU foam, oleophilic property and rough surface of GNs, and hydrophilic property of CNWs to construct a superamphiphilic foam (graphene@polyurethane foams, CGPFs) through a facile and green dip-coating process.…”

Section: Introductionmentioning

confidence: 99%

Superamphiphilic Polyurethane Foams Synergized from Cellulose Nanowhiskers and Graphene Nanoplatelets

Zhang

Liu

Sui

2017

Adv Materials Inter

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oil are lower than 10°). In 1997, Fujishima and co-workers [14] first reported the photogeneration of a superamphiphilic titanium dioxide surface, producing the microstructure composed of both hydrophilic and oleophilic phases by ultraviolet irradiation. Up to date, two approaches are used to construct superhydrophilic surfaces: one is that some special materials are induced to produce superhydrophilic properties under UV illumination conditions, i.e., photoinduced superhydropholic materials, such as TiO 2 , ZnO, and SnO 2 , [15,16] in which the slightly hydrophilic surface turned to highly hydrophilic surface; the other approach is to increase the surface roughness the hydrophilic material or to create a rough surface by assembling hydrophilic coatings, which is similar to the method of preparing superoleophilic surfaces. [17] Surface roughness, defined as the ratio of the actual surface area to the geometric surface area, has a critical effect on the wettability. It can adjust the wetting characteristics of materials, [18] based on the classical Wenzel [19] and Cassie and Baxter [20] models.Graphene, [21] a one-atom-thick planar sheet in a 3D honeycomb network arranged by carbon atoms, has drawn increasing attention due to high surface area, excellent thermal and chemical stability, and outstanding electrical conductivity since the famous 2004 "scotch tape" experiment by Novoselov et al. [22] 3D graphene-based materials [23][24][25] were extensively studied because of their superhydrophobicity, superior liquid absorption capacity, and excellent stability under harsh chemical and physical conditions. Most 3D graphene assemblies are acquired by reducing graphene oxide (GO), which features hydrophobic and hydrophilic domains, synthesized from graphite powder based on the well-known Hummers' method. [26] Singh et al. [27] demonstrated that superhydrophobic graphene foams (water contact angle (WCA) approach 163°) were synthesized by using template-directed chemical vapor deposition, which contained pores with the size of several hundreds of micrometers, while the walls of the foam was comprised of few-layer graphene sheets coated with Teflon. Ren et al. [28] reported a robust graphene aerogel (water contact angle close to 150.5°) prepared by resorcinol-formaldehyde (RF) sol-gel chemistry for absorbing oils and organic solvents, and the absorption capacity of various oils and organic solvents was up to 19-26 times of its own weight. Oribayo et al. [29] employed polydopamine-reduced graphene oxide and octadecylamine to modify the surface of Superamphiphilic materials are attracting significant attention because of their unique affinity to both water and oil. It is generally accepted that graphene-based assemblies are hydrophobic. Here, novel superamphiphilic polyurethane (PU) foams by the synergetic effect of cellulose nanowhiskers (CNWs) and graphene nanosheets (GNs) are reported. This process involves the creation of CNWs' base coating on the surface of PU network prior to GN coatings to obtain superamphiphilic surf...

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Surface and Structure Characteristics, Self-Assembling, and Solvent Compatibility of Holocellulose Nanofibrils

Cited by 48 publications

References 35 publications

Rice Straw Cellulose Nanofibrils via Aqueous Counter Collision and Differential Centrifugation and Their Self-Assembled Structures

Rice Straw Cellulose Nanofibrils via Aqueous Counter Collision and Differential Centrifugation and Their Self-Assembled Structures

Reduced polarity and improved dispersion of microfibrillated cellulose in poly(lactic-acid) provided by residual lignin and hemicellulose

Superamphiphilic Polyurethane Foams Synergized from Cellulose Nanowhiskers and Graphene Nanoplatelets

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