Direct Interfacial Modification of Nanocellulose Films for Thermoresponsive Membrane Templates

Hakalahti, Minna; Mautner, Andreas; Johansson, Leena‐Sisko; Hänninen, Tuomas; Setälä, Harri; Kontturi, Eero; Bismarck, Alexander; Tammelin, Tekla

doi:10.1021/acsami.5b12300

Cited by 48 publications

(45 citation statements)

References 25 publications

(37 reference statements)

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Section: Functional Materials Based On Nanocellulosesmentioning

confidence: 99%

“…By grafting CNF films with thermoresponsive polymers, thermoreversible membranes were achieved (Figure c). By surface‐grafting poly( N ‐isopropylacrylamide), a temperature dependent water permeance was achieved, as the polymer formed hydrophobically collapsing coils upon heating . In order to treat waste waters, various flocculants have been used to combine impurity particles into large aggregates, which can be removed by settling or flotation .…”

Section: Functional Materials Based On Nanocellulosesmentioning

confidence: 99%

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Advanced Materials through Assembly of Nanocelluloses

et al. 2018

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There is an emerging quest for lightweight materials with excellent mechanical properties and economic production, while still being sustainable and functionalizable. They could form the basis of the future bioeconomy for energy and material efficiency. Cellulose has long been recognized as an abundant polymer. Modified celluloses were, in fact, among the first polymers used in technical applications; however, they were later replaced by petroleum-based synthetic polymers. Currently, there is a resurgence of interest to utilize renewable resources, where cellulose is foreseen to make again a major impact, this time in the development of advanced materials. This is because of its availability and properties, as well as economic and sustainable production. Among cellulose-based structures, cellulose nanofibrils and nanocrystals display nanoscale lateral dimensions and lengths ranging from nanometers to micrometers. Their excellent mechanical properties are, in part, due to their crystalline assembly via hydrogen bonds. Owing to their abundant surface hydroxyl groups, they can be easily modified with nanoparticles, (bio)polymers, inorganics, or nanocarbons to form functional fibers, films, bulk matter, and porous aerogels and foams. Here, some of the recent progress in the development of advanced materials within this rapidly growing field is reviewed.

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Section: Functional Materials Based On Nanocellulosesmentioning

confidence: 99%

Section: Functional Materials Based On Nanocellulosesmentioning

confidence: 99%

Advanced Materials through Assembly of Nanocelluloses

et al. 2018

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“…Thus, it is urgently needed to improve oil retention while still keeping oil content high in order to store sufficient lubricants. By the means of surface chemical modification, molecules with special functional groups could be grafted stably and uniformly onto the surface of substrate, thereby effectively changing its surface properties while still keeping its excellent bulk properties . Based on the polymerization of monomers with functional groups, Gauthier et al .…”

Section: Introductionmentioning

confidence: 99%

“…By the means of surface chemical modification, molecules with special functional groups could be grafted stably and uniformly onto the surface of substrate, thereby effectively changing its surface properties while still keeping its excellent bulk properties. [26][27][28] Based on the polymerization of monomers with functional groups, Gauthier et al have summarized nine important reaction categories that could be used for post-polymerization modification. 29,30 Generally, amidation reaction is more suitable for the modification of PI, because PI has carboxylic acid or anhydride functional groups.…”

Section: Introductionmentioning

confidence: 99%

Selectively enhanced oil retention of porous polyimide bearing materials by direct chemical modification

Zhang

Wang

et al. 2017

J of Applied Polymer Sci

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Porous polyimide (PI) materials containing lubricating oil have been widely used as bearing retainers in aerospace industry. High oil content and retention of porous bearing materials play an important role in assuring a successful mission of the spacecraft. Keeping both oil content and retention of bearing retainer materials high, however, is one of the bottlenecks to fulfill long lifetime missions. Chemical modification is expected to break this limitation by changing the surface properties. Inspired by this, here for the first time, the authors design a chemical method to improve silicon oil retention of porous PI samples. The results indicated that this modification could not only change the wettability of PI from hydrophilicity to hydrophobicity but also enhance the silicon oil retention from 52% to 87%. This strategy provides a novel approach to improve the oil retention of porous PI materials, which has the potential application in preparing bearing retainers with reliable, long‐term performance. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 45106.

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“…Furthermore, amphiphilicity and high hygroscopicity distinguish CNFs from many other nanomaterials that are comparable in terms of high surface areas and strength. Indeed, the strong film formation ability enables numerous opportunities in modern material science and nanotechnology ranging application areas from flat panel displays to water purification membranes, diagnostics and biocatalytic templates 24–28…”

Section: Introductionmentioning

confidence: 99%

High‐Resolution Patterned Biobased Thin Films via Self‐Assembled Carbohydrate Block Copolymers and Nanocellulose

Gestranius

Otsuka

Halila

et al. 2020

Adv Materials Inter

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The exploitation of the effortless self‐assembly behavior of biomass‐based bricks can be seen as a promising route toward the innovative architectures. Here, a straightforward approach is presented where carbohydrate‐based diblock copolymer, polystyrene‐block‐maltoheptaose (PS‐b‐MH), is organized either on a rigid ultrathin film or on a flexible self‐standing film of wood‐derived cellulose nanofibrils (CNFs). During solvent annealing PS‐b‐MH deposited on relatively rough CNF film undergoes spontaneous rearrangement into high‐resolution patterns with a diblock domain spacing of 10–15 nm. The ideal conditions the self‐assembly require weak interactions between block copolymer and the substrate to increase the chain mobility and enable rearrangements. This is exactly how the system behaves. Adsorption studies of PS‐b‐MH on CNF surfaces reveal weak interactions, and the formed PS‐b‐MH layer is soft and mobile. Even the appearance of more challenging vertical orientation formed on smooth CNF substrates is tentatively evidenced by grazing‐incidence small‐angle X‐ray scattering and atomic force microscope indicating favorable surface interactions between CNF and PS‐b‐MH.

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Direct Interfacial Modification of Nanocellulose Films for Thermoresponsive Membrane Templates

Cited by 48 publications

References 25 publications

Advanced Materials through Assembly of Nanocelluloses

Advanced Materials through Assembly of Nanocelluloses

Selectively enhanced oil retention of porous polyimide bearing materials by direct chemical modification

High‐Resolution Patterned Biobased Thin Films via Self‐Assembled Carbohydrate Block Copolymers and Nanocellulose

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