Ultrathin Films of Cellulose: A Materials Perspective

Kontturi, Eero; Spirk, Stefan

doi:10.3389/fchem.2019.00488

Cited by 57 publications

(38 citation statements)

References 151 publications

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“…In the near term, process refinements would lower the production cost of NCs [116]. As a new class of NCs, ultrathin films of cellulose have been emerging [117]. The ultrathin films would be available for optoelectronic devices, sensors, and so on.…”

Section: Discussionmentioning

confidence: 99%

Nanocelluloses and Related Materials Applicable in Thermal Management of Electronic Devices: A Review

2020

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Owing to formidable advances in the electronics industry, efficient heat removal in electronic devices has been an urgent issue. For thermal management, electrically insulating materials that have higher thermal conductivities are desired. Recently, nanocelluloses (NCs) and related materials have been intensely studied because they possess outstanding properties and can be produced from renewable resources. This article gives an overview of NCs and related materials potentially applicable in thermal management. Thermal conduction in dielectric materials arises from phonons propagation. We discuss the behavior of phonons in NCs as well.

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Section: Discussionmentioning

confidence: 99%

Nanocelluloses and Related Materials Applicable in Thermal Management of Electronic Devices: A Review

2020

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“…These films are particularly interesting as they provide a mostly amorphous matrix while featuring a smooth surface allowing for excluding roughness and morphology effects [ 36 ]. As the surfaces solely consist of cellulose, they represent an ideal model system to screen for interactions with polysaccharides and proteins [ 37 , 38 ].…”

Section: Resultsmentioning

confidence: 99%

Interactions and Dissociation Constants of Galactomannan Rendered Cellulose Films with Concavalin A by SPR Spectroscopy

et al. 2020

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Interactions of biomolecules at interfaces are important for a variety of physiological processes. Among these, interactions of lectins with monosaccharides have been investigated extensively in the past, while polysaccharide-lectin interactions have scarcely been investigated. Here, we explore the adsorption of galactomannans (GM) extracted from Prosopis affinis on cellulose thin films determined by a combination of multi-parameter surface plasmon resonance spectroscopy (MP-SPR) and atomic force microscopy (AFM). The galactomannan adsorbs spontaneously on the cellulose surfaces forming monolayer type coverage (0.60 ± 0.20 mg·m−2). The interaction of a lectin, Concavalin A (ConA), with these GM rendered cellulose surfaces using MP-SPR has been investigated and the dissociation constant KD (2.1 ± 0.8 × 10−8 M) was determined in a range from 3.4 to 27.3 nM. The experiments revealed that the galactose side chains as well as the mannose reducing end of the GM are weakly interacting with the active sites of the lectins, whereas these interactions are potentially amplified by hydrophobic effects between the non-ionic GM and the lectins, thereby leading to an irreversible adsorption.

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“…For example, (biodegradable, renewable) cellulose‐based photoresist overcome several drawbacks of conventional photoresists. [ 89 ] On the other hand, the potential for using polysaccharides, for example, cellulose, chitosan, starch, pectin, and alginate is enormous because these biomaterials form films and coatings with good barrier properties against the transport of gases such as oxygen and carbon dioxide. The mechanical properties of the films can be improved by several strategies, for example, cross‐linking, addition of plasticizers, and use of composite films.…”

Section: Regeneration Of Cellulose In Different Physical Formsmentioning

confidence: 99%

Cellulose Regeneration and Chemical Recycling: Closing the “Cellulose Gap” Using Environmentally Benign Solvents

Seoud

Kostag

Jedvert

et al. 2020

Macro Materials & Eng

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matched by synthetic fibers. Therefore, the demand on natural and fabricated cellulosic fibers is expected to continue and rise. The production of cotton, however, is not expected to meet this demand because of restrictions on farmland use and availability of irrigation water. [3] Anticipating the so-called "the cellulosic fiber gap," [1] the textile industry currently leads several initiatives for developing fibers that can complement cotton. [3] Consequently, there is incitement and opportunities for an increase in use of cellulose from other sources, in particular wood, and increased interest in physical (i.e., mechanical) and chemical recycling (CR) of biopolymers. [4] Production of fibers and other artifacts from cellulose extracted from wood involves chemical or physical dissolution of the biopolymer, followed by its regeneration in the desired physical form in an appropriate bath. The most important example of cellulose chemical dissolution (i.e., via covalent bond formation) is the viscose rayon fiber, produced by regeneration of cellulose from its xanthate in acid bath. The Lyocell fiber process involves, however, physical dissolution of cellulose in N-methylmorpholine-N-oxide (NMMO) hydrate, followed by regeneration in an aqueous bath. [5] Cellulose regeneration is not restricted to formation of fibers. The biopolymer and its derivatives, in particular esters, can be "shaped" into other physical forms including spheres of different diameters (down to the nanoscale), films produced by casting and spin coating, and nonwoven mats produced by electrospinning or solution blowing. This review covers some recent advances of the regeneration of cellulose from alkali solutions and ionic solvents, in particular those based on imidazole, quaternary ammonium electrolytes (QAEs), and salts of heterocyclic super-bases. We refer to these ionic solvents collectively as ionic liquids (ILs). Representative examples of the ILs employed for cellulose dissolution are shown in Figure 1. These solvents dissolve cellulose samples of a wide range of degrees of polymerization (DPs) and indices of crystallinity (Ics). For practical reasons, binary mixtures of ILs with molecular solvents (MSs) are used alongside pure ILs. This use is advantageous because of the concomitant decrease in solution viscosity; there are many examples where the binary solvent mixture dissolves more cellulose than the parent pure IL. [5] Strategies to mitigate the expected "cellulose gap" include increased use of wood cellulose, fabric reuse, and recycling. Ionic liquids (ILs) are employed for cellulose physical dissolution and shaping in different forms. This review focuses on the regeneration of dissolved cellulose as nanoparticles, membranes, nonwoven materials, and fibers. The solvents employed in these applications include ILs and alkali solutions without and with additives. Cellulose fibers obtained via the carbonate and carbamate processes are included. Chemical recycling (CR) of polycotton (cellulose plus poly(ethylene terephthalate)) is addressed...

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Ultrathin Films of Cellulose: A Materials Perspective

Cited by 57 publications

References 151 publications

Nanocelluloses and Related Materials Applicable in Thermal Management of Electronic Devices: A Review

Nanocelluloses and Related Materials Applicable in Thermal Management of Electronic Devices: A Review

Interactions and Dissociation Constants of Galactomannan Rendered Cellulose Films with Concavalin A by SPR Spectroscopy

Cellulose Regeneration and Chemical Recycling: Closing the “Cellulose Gap” Using Environmentally Benign Solvents

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