Hydroxypropyl cellulose photonic architectures by soft nanoimprinting lithography

Espinha, André; Dore, Camilla; Matricardi, Cristiano; Alonso, M. I.; Goñi, Alejandro R.; Mihi, Agustín

doi:10.1038/s41566-018-0152-1

Cited by 172 publications

(183 citation statements)

References 35 publications

(40 reference statements)

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“…The total thickness of the adhesive layer is 40 µm. At low concentration, the HPC suspension can be solidified into a transparent hydrogel with amorphous phase by dehydration (Figure b‐ii) . To prevent the dissolution of the solidified HPC by water, the HPC was crosslinked by adding divinyl sulfone (0.42 wt%) into the HPC suspension (Figure c‐ii).…”

Section: Resultsmentioning

confidence: 99%

Ultra‐Adaptable and Wearable Photonic Skin Based on a Shape‐Memory, Responsive Cellulose Derivative

Lee

et al. 2019

Adv Funct Materials

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Photonic skins enable a direct and intuitive visualization of various physical and mechanical stimuli with eye-readable colorations by intimately laminating to target substrates. Their development is still at infancy compared to that of electronic skins. Here, an ultra-adaptable, large-area (10 × 10 cm 2 ), multipixel (14 × 14) photonic skin based on a naturally abundant and sustainable biopolymer of a shape-memory, responsive multiphase cellulose derivative is presented. The wearable, multipixel photonic skin mainly consists of a photonic sensor made of mesophase cholesteric hydroxypropyl cellulose and an ultraadaptable adhesive layer made of amorphous hydroxypropyl cellulose. It is demonstrated that with multilayered flexible architectures, the multiphase cellulose derivative-based integrated photonic skin can not only strongly couple to a wide range of biological and engineered surfaces, with a maximum of ≈180 times higher adhesion strengths compared to those of the polydimethylsiloxane adhesive, but also directly convert spatiotemporal stimuli into visible color alterations in the large-area, multipixel array. These colorations can be simply converted into 3D strain mapping data with digital camera imaging.

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Section: Resultsmentioning

confidence: 99%

Ultra‐Adaptable and Wearable Photonic Skin Based on a Shape‐Memory, Responsive Cellulose Derivative

Lee

et al. 2019

Adv Funct Materials

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“…Cellulose derivatives can be fabricated into materials with many desirable functions; for example, hydroxypropyl cellulose is a biocompatible material that is used widely in various food industry and medical applications, and can be used to prepare anisotropic films with supramolecular liquid crystalline ordering . Cellulose can be used for soft lithography of photonic structures, and cellulose films, fibers, and mats with desired characteristics can be prepared with control over molecular ordering with amorphous, chiral ordered, and nanocrystalline regions . Geng et al used the humidity‐induced actuation of cellulose LC films to design a humidity‐driven cellulose LC motor .…”

Section: Interfacing Azo To Bio: An Eye Toward Influencing Living Sysmentioning

confidence: 99%

Photoreversible Soft Azo Dye Materials: Toward Optical Control of Bio‐Interfaces

Chang

Fedele

Priimägi

et al. 2019

Advanced Optical Materials

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systems interact with artificial materials, researchers have now assembled a versatile toolkit of materials and processes that allows one to fine-tune interactions at the interface, tailoring specific biological responses on demand. These strategies for biocontrol can be broadly categorized as chemical (charge, ligand presence, surface groups), material changes (moisture content, stiffness), or morphological changes (molecular orientation, surface topography, or mechanical actuation). Rational design of materials for biological interface applications has a unique set of challenges due to the unique requirements of a wide range of biological systems, since different tissues present specific compositions, with their own elasticity, structural organization, and triggering mechanisms. Even within a single organ or tissue, mechanical properties can vary widely depending on the region. A recent study of viscoelasticity in live mouse brain tissue for example found a tenfold difference within the brain depending on the region and morphological structure studied. [2] However, most biological tissues are far less stiff, and far more viscoelastic than typical artificial materials employed at their interface, especially early artificial cell culture materials, which can be much stiffer than in vivo extracellular matrix by many orders of magnitude. [3] In vivo, cells interface with a surrounding microenvironment consisting of an intricate macromolecular network of proteins and sugars swollen in an aqueous media gel. Therefore, the interaction between cells and the extracellular matrix (ECM) in the body is complex and involves a variety of cues related to topography, chemical markers, protein composition, solubility factors, and mechanical properties such as stiffness and elasticity (Figure 1a). [4] Yet much research over the past decades was focused on studying in vitro the effects of each of these signals on cell behavior, with a particular interest on the chemical factors, whereas only recently more advanced biomaterials with controlled physicomechanical properties have been developed, such as those with tunable and variable stiffness, alignment and orientation of key functional groups, and mechanical actuation. There is a large range of stiffness in human tissue, where bone (≈100 GPa) is nine orders of magnitude harder than brain tissue (≈0.1 kPa). [4] Therefore, biomaterial researchers assume a complex task of providing materials and processing technologies for controlling stiffness and micro-and nanostructures in Photoreversible optically switchable azo dye molecules in polymer-based materials can be harnessed to control a wide range of physical, chemical, and mechanical material properties in response to light, that can be exploited for optical control over the bio-interface. As a stimulus for reversibly influencing adjacent biological cells or tissue, light is an ideal triggering mechanism, since it can be highly localized (in time and space) for precise and dynamic control over a biosystem, and low-power visible light...

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“…[7][8][9] High-quality patterns and structures can be produced via this technology and are applied in the biological and photoelectric elds. [10][11][12] However, the popularization of so lithography is still limited on account of the disadvantages of large elasticity and easy swelling of PDMS materials, and the tedious experimental procedures. In recent years, Si templates with three-dimensional micro-topographies (such as pillars or spindles) are gradually arousing researchers' interests in patterned nanoparticle self-assembly or crystal growth via liquid bridges between the template and the target substrate.…”

Section: Introductionmentioning

confidence: 99%

Capillary liquid bridge soft lithography for micro-patterning preparation based on SU-8 photoresist templates with special wettability

Wang

Luan

et al. 2019

RSC Adv.

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Hydroxypropyl cellulose photonic architectures by soft nanoimprinting lithography

Cited by 172 publications

References 35 publications

Ultra‐Adaptable and Wearable Photonic Skin Based on a Shape‐Memory, Responsive Cellulose Derivative

Ultra‐Adaptable and Wearable Photonic Skin Based on a Shape‐Memory, Responsive Cellulose Derivative

Photoreversible Soft Azo Dye Materials: Toward Optical Control of Bio‐Interfaces

Capillary liquid bridge soft lithography for micro-patterning preparation based on SU-8 photoresist templates with special wettability

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