Fabrication of micropillars on nanocellulose films using a roll-to-roll nanoimprinting method

Mäkelä, Tapio; Kainlauri, Markku; Willberg‐Keyriläinen, Pia; Tammelin, Tekla; Forsström, Ulla

doi:10.1016/j.mee.2016.05.023

Cited by 39 publications

(32 citation statements)

References 21 publications

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“…The appearance of TEMPO CNF is a viscous and transparent hydrogel (light transmittance of 74.3% at 800 nm by UVVis spectroscopy). 23 The carbohydrate composition of TEMPO CNF is 64.0% glucose, 6.2% xylose and 2.1% mannose.…”

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confidence: 99%

Versatile templates from cellulose nanofibrils for photosynthetic microbial biofuel production

et al. 2018

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Versatile templates were fabricated using plant-derived nanomaterials, TEMPO-oxidized cellulose nanofibrils (TEMPO CNF) for the efficient and sustainable production of biofuels from cyanobacteria and green algae. We used three different approaches to immobilize the model filamentous cyanobacteria or green algae to the TEMPO CNF matrix. These approaches involved the fabrication of: (A) a pure TEMPO CNF hydrogel; (B) a Ca 2+ -stabilized TEMPO CNF hydrogel; and (C) a solid TEMPO CNF film, which was crosslinked with polyvinyl alcohol (PVA). The different immobilization approaches resulted in matrices with enhanced water stability performance. In all cases, the photosynthetic activity and H 2 photoproduction capacity of cyanobacteria and algae entrapped in TEMPO CNF were comparable to a conventional alginate-based matrix. Green algae entrapped in Ca 2+ -stabilized TEMPO CNF hydrogels showed even greater rates of H 2 production than control alginate-entrapped algae under the more challenging submerged cultivation condition. Importantly, cyanobacterial filaments entrapped within dried TEMPO CNF films showed full recovery once rewetted, and they continued efficient H 2 production. The immobilization mechanism was passive entrapment, which was directly evidenced using surface sensitive quartz crystal microbalance with dissipation monitoring (QCM-D). The results obtained demonstrate a high compatibility between CNF and photosynthetic microbes. This opens new possibilities for developing a novel technology platform based on CNF templates with tailored pore-size and controllable surface charges that target sustainable chemical production by oxygenic photosynthetic microorganisms.

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Versatile templates from cellulose nanofibrils for photosynthetic microbial biofuel production

et al. 2018

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“…Self‐standing films of CNF and TEMPO‐CNF were prepared with a patented cast coating method which is described in detail in Mäkelä et al4,47 Briefly, the undiluted CNF or TEMPO CNF gels with sorbitol (30 wt% of dry film, Sigma‐Aldrich) were mixed together, first with a high shear rotor stator mixer (Ultra Turrax T25, IKAWorks, Wilmington, NC, USA) at ≈15 000 rpm for 1 min and later with a speedmixer (SpeedMixer DAC 1100.1 VAC‐P, Hauschild Engineering, Germany) at 1600 rpm for 10 min. Due to very brittle character of the TEMPO CNF films, polyvinyl alcohol (PVA, Mowiol 56–98, M w 195 000, 10 wt% of dry film from Sigma‐Aldrich) was used to enhance the strength properties.…”

Section: Methodsmentioning

confidence: 99%

“…Nanoscale level self‐assembly of carbohydrate‐based materials such as cellulose nanofibrils (CNF) and amphiphilic glycopolymers constitute an elegant bottom up approach that will allow the introduction of eco‐friendly manufacturing processes. This will unprecedentedly enable the fabrication of continuous high‐resolution patterned structures with green, simple and upscalable processes, which can be utilized in next generation devices such as biobased optical structures and nanotemplated membranes 4,5…”

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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“…First the fibre suspension was passed through the chambers having diameters of 500 µm Self-standing CNF films were produced by solvent casting method of cellulose nanofibrils which is based on precise control of adhesion, spreading, drying and delaminating of the material on a plastic substrate with a patented method. [21,7] Films were manufactured in semi-pilot scale using machinery manufactured by Coatema Coating Machinery GmbH.…”

Section: Methodsmentioning

confidence: 99%

“…These include, for example, piezoelectric properties, low thermal conductivity, high thermal stability, and low density coupled with relatively high strength as well as the ability to form flexible films that can act as a gas barrier material. [4][5][6][7] Hybrid structures combining organic with inorganic materials are commonplace and many of the applications, like solar cells, are based on thin film technology. [8] The use of biopolymers, however, has remained a largely unexplored area with thin film hybrids, particularly concerning plant-based polysaccharides like cellulose.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature atomic layer deposition of SiO ₂ /Al ₂ O ₃ multilayer structures constructed on self-standing films of cellulose nanofibrils

Putkonen

Sippola

Svärd

et al. 2017

Phil. Trans. R. Soc. A.

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In this paper, we have optimized a low-temperature atomic layer deposition (ALD) of SiO 2 using AP-LTO® 330 and ozone (O 3 ) as precursors, and demonstrated its suitability to surface-modify temperature-sensitive bio-based films of cellulose nanofibrils (CNFs). The lowest temperature for the thermal ALD process was 80°C when the silicon precursor residence time was increased by the stop-flow mode. The SiO 2 film deposition rate was dependent on the temperature varying within 1.5–2.2 Å cycle −1 in the temperature range of 80–350°C, respectively. The low-temperature SiO 2 process that resulted was combined with the conventional trimethyl aluminium + H 2 O process in order to prepare thin multilayer nanolaminates on self-standing CNF films. One to six stacks of SiO 2 /Al 2 O 3 were deposited on the CNF films, with individual layer thicknesses of 3.7 nm and 2.6 nm, respectively, combined with a 5 nm protective SiO 2 layer as the top layer. The performance of the multilayer hybrid nanolaminate structures was evaluated with respect to the oxygen and water vapour transmission rates. Six stacks of SiO 2 /Al 2 O with a total thickness of approximately 35 nm efficiently prevented oxygen and water molecules from interacting with the CNF film. The oxygen transmission rates analysed at 80% RH decreased from the value for plain CNF film of 130 ml m −2 d −1 to 0.15 ml m −2 d −1 , whereas the water transmission rates lowered from 630 ± 50 g m −2 d −1 down to 90 ± 40 g m −2 d −1 . This article is part of a discussion meeting issue ‘New horizons for cellulose nanotechnology’.

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Fabrication of micropillars on nanocellulose films using a roll-to-roll nanoimprinting method

Cited by 39 publications

References 21 publications

Versatile templates from cellulose nanofibrils for photosynthetic microbial biofuel production

Versatile templates from cellulose nanofibrils for photosynthetic microbial biofuel production

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

Low-temperature atomic layer deposition of SiO ₂ /Al ₂ O ₃ multilayer structures constructed on self-standing films of cellulose nanofibrils

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Fabrication of micropillars on nanocellulose films using a roll-to-roll nanoimprinting method

Cited by 39 publications

References 21 publications

Versatile templates from cellulose nanofibrils for photosynthetic microbial biofuel production

Versatile templates from cellulose nanofibrils for photosynthetic microbial biofuel production

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

Low-temperature atomic layer deposition of SiO 2 /Al 2 O 3 multilayer structures constructed on self-standing films of cellulose nanofibrils

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Low-temperature atomic layer deposition of SiO ₂ /Al ₂ O ₃ multilayer structures constructed on self-standing films of cellulose nanofibrils