Transformation of hydrophilic cotton fabrics into superhydrophobic surfaces for oil/water separation

Liang, Jun; Zhou, Yang; Jiang, Guohua; Wang, Rijing; Wang, Xiaohong; Hu, Ruanbing; Xi, Xiaoguang

doi:10.1080/00405000.2012.721207

Cited by 48 publications

(29 citation statements)

References 16 publications

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“…Apart from fire and heat barrier properties, to promote functionality and applicability of the coated fabrics in harsh or humid environment, we sought to impart them with an amphiphobic coating, providing water (and oil) repellency and combining it with self-cleaning features. The latter is generally obtained by coatings of low surface energy and hierarchical roughness3063646566.…”

Section: Resultsmentioning

confidence: 99%

Large-scale, thick, self-assembled, nacre-mimetic brick-walls as fire barrier coatings on textiles

Das

Thomas

Moeller

et al. 2017

Sci Rep

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Highly loaded polymer/clay nanocomposites with layered structures are emerging as robust fire retardant surface coatings. However, time-intensive sequential deposition processes, e.g. layer-by-layer strategies, hinders obtaining large coating thicknesses and complicates an implementation into existing technologies. Here, we demonstrate a single-step, water-borne approach to prepare thick, self-assembling, hybrid fire barrier coatings of sodium carboxymethyl cellulose (CMC)/montmorillonite (MTM) with well-defined, bioinspired brick-wall nanostructure, and showcase their application on textile. The coating thickness on the textile is tailored using different concentrations of CMC/MTM (1–5 wt%) in the coating bath. While lower concentrations impart conformal coatings of fibers, thicker continuous coatings are obtained on the textile surface from highest concentration. Comprehensive fire barrier and fire retardancy tests elucidate the increasing fire barrier and retardancy properties with increasing coating thickness. The materials are free of halogen and heavy metal atoms, and are sourced from sustainable and partly even renewable building blocks. We further introduce an amphiphobic surface modification on the coating to impart oil and water repellency, as well as self-cleaning features. Hence, our study presents a generic, environmentally friendly, scalable, and one-pot coating approach that can be introduced into existing technologies to prepare bioinspired, thick, fire barrier nanocomposite coatings on diverse surfaces.

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Section: Resultsmentioning

confidence: 99%

Large-scale, thick, self-assembled, nacre-mimetic brick-walls as fire barrier coatings on textiles

Das

Thomas

Moeller

et al. 2017

Sci Rep

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“…Cellulosic materials treated by them possess reduced surface energy, which is obvious from the high water contact angle (Figure C). If a material has a superhydrophobic character with a value that exceeds 150° and a sliding angle of less than 10°, the morphology with roughness at the microscale level should be tuned (Figure F) …”

Section: Applicationsmentioning

confidence: 99%

“…Another reason for hydrophobization is to make cellulose wettable and compatible with nonpolar organic solvents, oils, and melted synthetic polymers. This property offers great promise for developing oil absorbents and oil–water separating membranes …”

Section: Applicationsmentioning

confidence: 99%

Cellulose Mineralization as a Route for Novel Functional Materials

Shchipunov

Postnova

2018

Adv Funct Materials

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Cellulose possesses excellent properties, but its performance characteristics do not satisfy human requirements completely, which has soured a constant effort to improve its features. Currently, cellulose is combined with inorganics in a process called mineralization that results in a novel type of materials referred to as bio-nanocomposites. There are many examples of mineralized tissues with superior properties in living nature. This circumstance gives us a reason to biomimic them by compounding biopolymers with inorganics. Here, the main mineralization techniques, properties, structure, functionality, and application of mineralized cellulose are the focus. Cellulose can be combined with inorganics through the vapor phase or by the methods of wet chemistry. Much attention has been paid to sol-gel chemistry, which is of first importance in cellulose mineralization. Inorganics can protect polysaccharides, regulate hydrophilicity-hydrophobicity, and impart self-cleaning, antimicrobial and conducting properties, which not only improves them but results in bio-nanocomposites with novel functionalities and performance, not known before for cellulosic materials. Further calcination and carbonization of mineralized cellulose under mild conditions give nanosized metals, metal oxides, and their nanocomposites with carbon, which are often unavailable by conventional methods. Therefore, mineralization is used to develop innovative textiles, oil absorbent and oil/water separating membranes, catalysts and photocatalysts, solar cells, conductors, supercapacitors, transistors and batteries for flexible electronics, and energy storage devices. These nontraditional and highly promising areas for applications have caused an intense interest in cellulose that resembles its rediscovery.

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“…These attractive properties, especially when coupled with chemical and/or physical modifications that influence function, provide a platform for the development of advanced materials based on cellulose. In fact, during the past several decades, studies have shown that surface modifications of cellulose produce functional surfaces that can be used for high‐value‐added applications in areas as diverse as composite materials, flexible organic electronics, biomedical applications, microfluidic devices, self‐cleaning surfaces, and oil–water separation systems …”

Section: Introductionmentioning

confidence: 99%

Covalent functionalization of solid cellulose by divergent synthesis of chemically active dendrons

Anavi

Popowski

Slor

et al. 2018

J. Polym. Sci. Part A: Polym. Chem.

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Covalent surface modification of solid cellulose with well‐defined and chemically reactive dendrons is introduced as a platform for cellulose grafting with functional materials. Surface functionalization with a first generation dendron is achieved by esterification employing bifunctional molecules based on 2,2‐bis(hydroxymethyl) propionic acid (bis‐MPA) under mild conditions and short reaction times. The activated cellulose surface displays hydrophobic properties and contains two reactive alkene end‐groups per graft, which are used for covalent binding to active agents, as demonstrated by selective functionalization of the modified cellulose with fluorescent dye via photopatterning. The number of active end‐groups on the surface of cellulose is multiplied by divergent solid‐state synthesis of second and third generation dendrons having four and eight reactive sites per dendron, respectively. The dendrons are assembled in only few hours by a sequence of thiol‐ene/esterification reactions. The ability to accurately control the number of binding sites on the surface of cellulose allows fine tuning of the surface properties, as shown by the attachment of hydrophobic small molecules to the dendronized cellulose. The first, second and third generation dendrons allow preparing surfaces with increasing hydrophobicities; second and third generation dendrons functionalized with small perfluoroalkyl molecule display superhydrophobic properties. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2018, 56, 2103–2114

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Transformation of hydrophilic cotton fabrics into superhydrophobic surfaces for oil/water separation

Cited by 48 publications

References 16 publications

Large-scale, thick, self-assembled, nacre-mimetic brick-walls as fire barrier coatings on textiles

Large-scale, thick, self-assembled, nacre-mimetic brick-walls as fire barrier coatings on textiles

Cellulose Mineralization as a Route for Novel Functional Materials

Covalent functionalization of solid cellulose by divergent synthesis of chemically active dendrons

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