Dynamics of Hydration of Nanocellulose Films

Bettotti, Paolo; Maestri, Cecilia Ada; Guider, R.; Mancini, Ines; Nativ‐Roth, Einat; Golan, Yuval; Scarpa, Marina

doi:10.1002/admi.201500415

Cited by 33 publications

(39 citation statements)

References 45 publications

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“…When depositing an EGaIn layer (with the thickness of 5 µm) on a moisture‐sensitive nanocellulose film (with the thickness of 110 µm), the Joule effect under U ≈ 2.5 V could dehydrate the bilayer film under an appropriate humidity (≈70%) and induce unsymmetrical volumetric shrinkage ( Figure A and Figure S24, Supporting Information). A bending angle up to 65° was achieved for this flexible actuator within 7 s and fully recovered within 8 s due to rehydration of nanocellulose upon turning the voltage off (Figure B). This electrothermal actuating behavior could be precisely tuned by the bias potential applied on these artificial muscles (Figure C and Video S1, Supporting Information).…”

Section: Resultsmentioning

confidence: 97%

Liquid Metal Droplets Wrapped with Polysaccharide Microgel as Biocompatible Aqueous Ink for Flexible Conductive Devices

Zong

et al. 2018

Adv Funct Materials

226

209

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Nanometerization of liquid metal in organic systems can facilitate deposition of liquid metals onto substrates and then recover its conductivity through sintering. Although having broader potential applications, producing stable aqueous inks of liquid metals keeps challenging because of rapid oxidation of liquid metal when exposing to water and oxygen. Here, a biocompatible aqueous ink is produced by encapsulating alloy nanodroplets of gallium and indium (EGaIn) into microgels of marine polysaccharides. During sonicating bulk EGaIn in aqueous alginate solution, alginate not only facilitates the downsizing process via coordination of their carboxyl groups with Ga ions but also forms microgel shells around EGaIn droplets. Due to the deceasing oxygen-permeability of microgel shells, aqueous ink of EGaIn nanodroplets can maintain colloidal and chemical stability for a period of >7 d. Crosslinked alginate-gel with tunable thickness can retard the generation and release of toxic cations, thereby affording high biocompatibility. The soft alginate shells also enable to recover electric conductivity of EGaIn layers by "mechanical sintering" for applications in microcircuits, electric-thermal actuators, and wearable sensors, offering huge potential for electronic tattoos, artificial limbs, electric skins, etc.

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Section: Resultsmentioning

confidence: 97%

Liquid Metal Droplets Wrapped with Polysaccharide Microgel as Biocompatible Aqueous Ink for Flexible Conductive Devices

Zong

et al. 2018

Adv Funct Materials

226

209

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“…Films produced from carboxylated cellulose nanofibers were found to reversibly respond to a water gradient, presenting a bending movement within 1–2 s. The authors suggested that the bending mechanism is related to the sorption of water by the hydrophilic nanocellulose rods at the interface of the film. The direction and the magnitude of the flux of the water molecules was reported to drive the bending of the films and the frequency of the motion, respectively …”

Section: Cellulose‐based Films That Mimic the Movements Of Hydro‐respmentioning

confidence: 99%

Cellulose‐Based Biomimetics and Their Applications

et al. 2018

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Nature has been producing cellulose since long before man walked the surface of the earth. Millions of years of natural design and testing have resulted in cellulose-based structures that are an inspiration for the production of synthetic materials based on cellulose with properties that can mimic natural designs, functions, and properties. Here, five sections describe cellulose-based materials with characteristics that are inspired by gratings that exist on the petals of the plants, structurally colored materials, helical filaments produced by plants, water-responsive materials in plants, and environmental stimuli-responsive tissues found in insects and plants. The synthetic cellulose-based materials described herein are in the form of fibers and films. Fascinating multifunctional materials are prepared from cellulose-based liquid crystals and from composite cellulosic materials that combine functionality with structural performance. Future and recent applications are outlined.

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“…On the other hand, nanocellulose (NC) has been probed as an ideal substrate for wearable optoelectronics . This polymer is obtained from the most common biopolymer on Earth, and it consists of rigid nanocrystals that can be easily assembled into films and gel materials.NC is not only an excellent bendable, deformable and stretchable material, but also exhibits very interesting properties for optoelectronics. Its advantages comprise a very high transparency in the visible, tunable chiral nematic order by the surface chemistry, low roughness, and extremely high gas barrier properties .…”

Section: Electrical and Electro‐optical Properties Of Mhp Films (350 mentioning

confidence: 99%

Integrated Optical Amplifier–Photodetector on a Wearable Nanocellulose Substrate

Suárez

Hassanabadi

Maulu

et al. 2018

Advanced Optical Materials

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Moreover, the implementation of a wearable photonic technology directly in contact with clothes would be light-weight, comfortable, noninvasive, implantable, and inherently low cost. It attracts a strong interest for industry in this futuristic field. Indeed, according to International Data Corporation, the important growth of this technology is forecasted to grow up to 213.6 millions in 2020. [8] Nowadays, examples of commercial real-time applications include textile-based displays, [9] photovoltaics [9] or health monitoring. [9] In spite of this significant progress, wearable devices still require reduced footprint, better coupling techniques, and the integration of more complex optic/electrical functionalities to meet the performances already provided by traditional semiconductors integrated on rigid substrates.Taking into account these current limitations, metal halide perovskites(MHPs) is a promising semiconductor for flexible/wearable optoelectronic devices because of the outstanding capabilities to provide light emission, gain generation, and photodetection functionalities of polycrystalline MHPs films grown at low temperature. Indeed, MHPs demonstrated a broad range of excellent electrical and optical properties, such as long diffusion lengths, [10] high absorption cross-section, [11] high quantum yield of emission at room temperature, [12] or tunable bandgap with the composition. [13] MHPbased devices include highly efficient solar cells, [14] optical active devices, [12,13,15,16] and photodetectors. [17,18] The majority of these publications, however, use a rigid substrate to fabricate the device, being a significantly lower amount of works on MHP flexible devices with a single functionality as solar cells, [19,20] optical switch, [21] or lasing. [22] On the other hand, nanocellulose (NC) [23,24] has been probed as an ideal substrate for wearable optoelectronics. [25] This polymer is obtained from the most common biopolymer on Earth, and it consists of rigid nanocrystals that can be easily assembled into films and gel materials.NC is not only an excellent bendable, deformable and stretchable material, [26] but also exhibits very interesting properties for optoelectronics. Its advantages comprise a very high transparency in the visible, [27] tunable chiral nematic order by the surface chemistry, [28] low roughness, and extremely high gas barrier properties. [29] Nevertheless, despite these promising abilities, integration of optoelectronic devices in cellulose has been elusive, being it polyimide or polydimethylsiloxane Flexible optoelectronics has emerged as an outstanding platform to pave the road toward vanguard technology advancements. As compared to conventional rigid substrates, a flexible technology enables mechanical deformation while maintaining stable performance. The advantages include not only the development to novel applications, but also the implementation of a wearable technology directly in contact with a curved surface. Here the monolithic integration of a perovskite-based optical wave...

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Dynamics of Hydration of Nanocellulose Films

Cited by 33 publications

References 45 publications

Liquid Metal Droplets Wrapped with Polysaccharide Microgel as Biocompatible Aqueous Ink for Flexible Conductive Devices

Liquid Metal Droplets Wrapped with Polysaccharide Microgel as Biocompatible Aqueous Ink for Flexible Conductive Devices

Cellulose‐Based Biomimetics and Their Applications

Integrated Optical Amplifier–Photodetector on a Wearable Nanocellulose Substrate

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