Redispersibility of cellulose nanoparticles modified by phenyltrimethoxysilane and its application in stabilizing Pickering emulsions

Zhang, Xinfang; Shao, Ziqiang; Zhou, Yi; Wei, Jie; He, Weidong; Wang, Shuo; Dai, Xiaofu; Ren, Jie

doi:10.1007/s10853-019-03691-6

Cited by 22 publications

(6 citation statements)

References 34 publications

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“…This indicates that the pore size distribution of the filter gradually shifts to micron-sized macropores when the addition of MTMS exceeds 1 wt %. According to a report by Zhang et al, 40 if the addition of MTMS was excessive, there were too many silanols generated, which would produce flocculation as oligomers in the suspension. Therefore, excessive addition of MTMS will cause the silanol to flocculate, increasing the pore size and reducing the specific surface area and porosity of the filters.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Super-hydrophobic Cellulose Nanofiber Air Filter with Highly Efficient Filtration and Humidity Resistance

Liu

Cai

et al. 2021

ACS Appl. Mater. Interfaces

122

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High-air humidity, especially condensation into droplets under the influence of temperature, can pose a serious threat to air purification filters. This report introduces the use of methyltrimethoxysilane (MTMS) for the silanization hydrophobic modification of cellulose nanofibers (CNFs) and obtains an air filter with super-hydrophobicity (CA = 152.4°) and high-efficiency filtration of particulate matter (PM) through the freeze-drying technology. The antihumidity performance of CNFs filters that undergo hydrophobic modification in high-humidity air is improved. Especially in the case of high-humidity air forming condensed water droplets, the increase in the rate of filtration resistance of the hydrophobically modified CNFs filter is much lower than that of the unmodified filter. In addition, the water-vapor-transmission rate of the hydrophobically modified filter is improved. More importantly, adding MTMS can regulate the porous structure of CNFs filters and improve the filtration performance. The specific surface area and the porosity of the filter are 26.54 m2/g and 99.21%, respectively, and the filtering effects of PM1.0 and PM2.5 reach 99.31 and 99.75%, respectively, while a low-filtration resistance (42 Pa) and a quality factor of up to 0.122 Pa–1 are achieved. This work has improved the application potential of high-performance air-purification devices to remove particulate pollution and may provide useful insights to design next-generation air filters suitable for application in high-air humidity.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Super-hydrophobic Cellulose Nanofiber Air Filter with Highly Efficient Filtration and Humidity Resistance

Liu

Cai

et al. 2021

ACS Appl. Mater. Interfaces

122

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“…The main mechanism of irreversible aggregation in nanocelluloses is explained by hydrogen bond formation between the particles. ,− Strategies for the aqueous redispersion of nanocelluloses include modified drying methods, surface modifications to increase hydrophobicity or steric stability, − and using co-dispersing media. − Different methods of drying, such as oven-, spray-, and freeze-drying, result in different redispersion properties. The freeze-dried CNC typically disperses more readily than the oven-dried CNC in water due to the larger specific surface area of freeze-dried flakes (as opposed to films), and spray-dried CNC granules form a gel layer that may slow down water penetration and impair redispersibility .…”

Section: Introductionmentioning

confidence: 99%

Nanoengineering the Redispersibility of Cellulose Nanocrystals

2022

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Enhancing the redispersibility of dried colloidal particles to yield stable dispersions after rehydration is a persistent challenge in the sustainable processing of nanocelluloses due to hydrogen bonding-induced irreversible aggregation. Programming nanocelluloses, such as cellulose nanocrystals (CNC), with moieties that enable colloidal repulsion after rehydration may address this challenge and contribute to the United Nation (UN)'s sustainable development goals (SDGs) of urban development and sustainable living (SDGs 9 and 11) and cradle-to-cradle processing (SDG 12). We hypothesize that imparting electrosteric repulsion to CNC via polyanionic disordered cellulose chains (hairs) protruding from each end may render the dried nanocrystals highly redispersible in aqueous media. Anionic hairy CNC (AHCNC), that is, CNC decorated with dicarboxylated cellulose (DCC) chains, were synthesized by the preferential, successive periodate/chlorite oxidation of the disordered regions of cellulose fibrils, bearing >5 mmol of carboxylate groups per gram. The colloidal properties of AHCNC were compared with those of sulfate half-ester groupfunctionalized CNC and TEMPO-oxidized CNC (TOCNC) after redispersion in aqueous media, followed by comparing the redispersibility of AHCNC and CNC in aqueous solutions containing monovalent or divalent cations and at varying pH. The AHCNC had remarkable aqueous redispersibility even at high ionic strengths and extreme pH. The unique redispersibility mechanism of dried AHCNC relies on the synergistic steric and electrostatic repulsion forces, recuperated upon the rehydration of DCC. This work may open new opportunities for more sustainable and cost-effective handling and processing of nanocelluloses.

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“…Generally, chemical modifications of cellulose have been made by grafting or adsorbing molecules on pristine cellulose surface, such as hydroxypropylmethyl groups [ 31 ], sodium carboxymethyl cellulose [ 32 ], dodecylamine [ 33 ], polystyrene [ 34 ], cinnamoyl chloride and butyryl chloride [ 35 ], phenyltrimethoxysilane [ 36 ] or octenyl succinic anhydride [ 30 , 37 ]. Others molecules have been grafted on cellulose to bring specific properties at PEs, as N -isopropylacrylamide, a thermo-responsive molecule [ 38 ], or poly[2-(dimethylamino)ethyl methacrylate], a pH-responsive molecule [ 39 ].…”

Section: Pickering Emulsions Stabilized With Modified Cellulosementioning

confidence: 99%

Interest of Pickering Emulsions for Sustainable Micro/Nanocellulose in Food and Cosmetic Applications

Perrin

Gillet²,

Gressin³

et al. 2020

Polymers

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In the present review, natural and non-toxic particles made of micro/nanocellulose were specifically targeted as stabilizers of emulsions located at dispersed and continuous phases interfaces (called Pickering Emulsions, PEs). PEs are biphasic systems stabilized by solid particles with a recent interest in food and cosmetic domains. PEs have been more and more studied in the last ten years due to their advantages compared to conventional emulsions with surfactants. PEs have already been stabilized with various types of particles and particularly cellulose. Even if some studies showed that PEs were more stable when cellulose was chemically modified, numerous other recent studies showed that unmodified micro/nanocellulose is also promising biomaterial to stabilize PEs. Micro/nanocelluloses can be extracted by various green processes from numerous agricultural wastes and co-products, as banana peels, corncob, ginkgo seed shells, lime residues, mangosteen rind, oil palm empty fruit bunches, pistachio shells, as well as wheat straw. Main green processes used to treat cellulose are grinding, high pressure homogenization, microfluidization, enzymatic hydrolysis, subcritical water, extrusion, electron beam irradiation, cryocrushing, microwaves or sonication. PEs formulated with cellulose clearly participate to a global sustainable development but, additional studies will be necessary to better understand PEs stability and improve properties.

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Redispersibility of cellulose nanoparticles modified by phenyltrimethoxysilane and its application in stabilizing Pickering emulsions

Cited by 22 publications

References 34 publications

Super-hydrophobic Cellulose Nanofiber Air Filter with Highly Efficient Filtration and Humidity Resistance

Super-hydrophobic Cellulose Nanofiber Air Filter with Highly Efficient Filtration and Humidity Resistance

Nanoengineering the Redispersibility of Cellulose Nanocrystals

Interest of Pickering Emulsions for Sustainable Micro/Nanocellulose in Food and Cosmetic Applications

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