Making flexible magnetic aerogels and stiff magnetic nanopaper using cellulose nanofibrils as templates

Olsson, Richard T.; Azizi, Samir; Salazar-Alvarez, Germán; Belova, Lyubov; Ström, Valter; Berglund, Lars A.; Ikkala, Olli; Nogués, J.; Gedde, Ulf W.

doi:10.1038/nnano.2010.155

Cited by 757 publications

(544 citation statements)

References 27 publications

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“…The actuation in these systems is achieved by (and requires) an external magnetic field. [29,30] This approach produces tunable composite materials, but requires large quantities of magnetic additives that are controlled by the application of a localized external magnetic field: this control is difficult and/or inconvenient to accomplish.…”

Section: Introductionmentioning

confidence: 99%

Electrically Activated Paper Actuators

Hamedi

Campbell

Rothemund

et al. 2016

Adv Funct Materials

143

151

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This paper describes the design and fabrication of electrically controlled paper actuators that operate based on the dimensional changes of that occur in paper when the moisture absorbed on the surface of the cellulose fibers changes. These actuators are called "Hygroexpansive Electrothermal Paper Actuators" (HEPAs). The actuators are made from paper, conducting polymer, and adhesive tape. They are lightweight, inexpensive, and can be fabricated using simple printing techniques. The central element of the HEPAs is a porous conducting path (used to provide electrothermal heating) that changes the moisture content of the paper and causes actuation. This conducting path is made by embedding a conducting polymer (PEDOT:PSS) within the paper, and thus making a paper / polymer composite that retains the porosity and hydrophilicity of paper. Different types of HEPAs (straight, pre-curved, and creased) achieved different types of motions (e.g., bending motion, accordion type motion). A theoretical model for their behavior is proposed. These actuators have been used for the manipulation of liquids, and for the fabrication of an optical shutter.

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Section: Introductionmentioning

confidence: 99%

Electrically Activated Paper Actuators

Hamedi

Campbell

Rothemund

et al. 2016

Adv Funct Materials

143

151

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“…Moreover, CNF may be composited with other polymers as well as a wide range of micro-or nano-particles. [45,46] Owing to its biocompatibility, biodegradability and low toxicity, CNF have also been touted as having "great potential for the breakthrough of a novel generation of biomedical materials". [47] Indeed, CNF has been investigated to replace the nucleus pulposus (inner core of the vertebral disc) as well as to stabilize and control the delivery of protein-coated drugs.…”

Section: Cellulose Nanofibersmentioning

confidence: 99%

Upscaling Organic Electronic Devices

Malti¹

2015

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Conventional electronics based on silicon, germanium, or compounds of gallium require prohibitively expensive investments. A state-of-the-art microprocessor fabrication facility can cost up to $15 billion while using environmentally hazardous processes. In that context, the discovery of solution-processable conducting (and semiconducting) polymers stirred up expectations of ubiquitous electronics because it enables the mass-production of devices using well established high-volume printing techniques. In essence, this thesis attempts to study the characteristics and applications of thin conducting polymer films (<200 nm), and scale them up to thick-films (>100 µm). First, thin-films of organic materials were combined with an electric double layer capacitor to decrease the operating voltage of organic field effect transistors. In addition, ionic current-rectifying diodes membranes were integrated inside electrochromic displays to increase the device's bistability and obviate the need for an expensive addressing backplane.This work also shows that it is possible to forgo the substrate and produce a self-standing electrochromic device by compositing the same water-processable material with nanofibrillated cellulose (plus a whitening pigment and high-boiling point solvents). In addition, we investigated the viability of these (semi)conducting polymer nanopaper composites in a variety of applications. This material exhibited an excellent combined electronic-ionic conductivity. Moreover, the conductivities in this easy-to-process composite remained constant within a wide range of thicknesses. Initially, this (semi)conducting nanopaper composite was used to produce electrochemical transistors with a giant transconductance (>1 S). Subsequently, it was used as electrodes to construct a supercapacitor whose capacitance exceeds 1 F.

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“…Moreover, it can absorb water and release it upon compression. Owing to the flexibility, high porosity and surface area, these aerogels are expected to be useful in microfluidics devices and as electronic actuators (Olsson et al, 2010).…”

Section: Magnetic Cellulose Hydrogels and Aerogelsmentioning

confidence: 99%