Silk inverse opals

Kim, Sunghwan; Mitropoulos, Alexander N.; Spitzberg, Joshua D.; Tao, Hu; Kaplan, David L.; Omenetto, Fiorenzo G.

doi:10.1038/nphoton.2012.264

Cited by 237 publications

(222 citation statements)

References 27 publications

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“…316 The colorimetric changes in these systems were shown to result from changes in the refractive index contrast, average refractive index contrast, and swelling. Thus, silk inverse opals have been made that are sensitive to infiltration with water, 285 various concentrations of glucose in aqueous solutions, and to humidity. 284 Chitosan inverse opals 286 were made that are sensitive to various organic solvents, pH values, and ionic strengths.…”

Section: Factors Influencing Sensing Applicationsmentioning

confidence: 99%

A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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Nature evolved a variety of hierarchical structures that produce sophisticated functions. Inspired by these natural materials, colloidal self-assembly provides a convenient way to produce structures from simple building blocks with a variety of complex functions beyond those found in nature. In particular, colloid-based porous materials (CBPM) can be made from a wide variety of materials. The internal structure of CBPM also has several key attributes, namely porosity on a sub-micrometer length scale, interconnectivity of these pores, and a controllable degree of order. The combination of structure and composition allow CBPM to attain properties important for modern applications such as photonic inks, colorimetric sensors, self-cleaning surfaces, water purification systems, or batteries. This review summarizes recent developments in the field of CBPM, including principles for their design, fabrication, and applications, with a particular focus on structural features and materials' properties that enable these applications. We begin with a short introduction to the wide variety of patterns that can be generated by colloidal self-assembly and templating processes. We then discuss different applications of such structures, focusing on optics, wetting, sensing, catalysis, and electrodes. Different fields of applications require different properties, yet the modularity of the assembly process of CBPM provides a high degree of tunability and tailorability in composition and structure. We examine the significance of properties such as structure, composition, and degree of order on the materials' functions and use, as well as trends in and future directions for the development of CBPM.

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Section: Factors Influencing Sensing Applicationsmentioning

confidence: 99%

A colloidoscope of colloid-based porous materials and their uses

et al. 2016

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“…Recently, optical clarity and good processability have reinvented silk as a material for high-technology, biooptical elements such as lenses, lasers, PhCs, and plasmonic resonators (11)(12)(13)(14)(15)(16)(17)(18). Due to the combination of favorable material traits, silk shows promise for use in optical elements for biomedical application.…”

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confidence: 99%

“…By increasing the effective RI, the wavelength corresponding to the photonic mode becomes red-shifted. Immersing the SHIO in isopropyl alcohol (IPA) (n ∼ 1.37), which is volatile enough not to cause any swelling of the silk matrix, red-shifts the reflection peak (λ peak ) from 500 in air to 616 nm (12). However, when the SHIO is immersed in water, the situation becomes more complex because the silk matrix accommodates water molecules and therefore becomes structurally expanded, resulting in a reduced RI.…”

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confidence: 99%

“…2B, the calculated pseudo-PBG frequencies (a/λ peak ) for the SHIOs in air and IPA are in good agreement with those obtained experimentally when d is 270 nm. The contracted lattice originates from the prolonged exposure to acetone used for removing PMMA spheres (12). To estimate the optical response of the swollen SHIO (in water), we first investigated the RI value of the swollen silk film (Fig.…”

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Deformable and conformal silk hydrogel inverse opal

Min

Kim

2017

Proc. Natl. Acad. Sci. U.S.A.

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Photonic crystals (PhCs) efficiently manipulate photons at the nanoscale. Applying these crystals to biological tissue that has been subjected to large deformation and humid environments can lead to fascinating bioapplications such as in vivo biosensors and artificial ocular prostheses. These applications require that these PhCs have mechanical durability, deformability, and biocompatibility. Herein, we introduce a deformable and conformal silk hydrogel inverse opal (SHIO); the photonic lattice of this 3D PhC can be deformed by mechanical strain. This SHIO is prepared by the UV cross-linking of a liquid stilbene/silk solution, to give a transparent and elastic hydrogel. The pseudophotonic band gap (pseudo-PBG) of this material can be stably tuned by deformation of the photonic lattice (stretching, bending, and compressing). Proof-of-concept experiments demonstrate that the SHIO can be applied as an ocular prosthesis for better vision, such as that provided by the tapeta lucida of nocturnal or deep-sea animals.silk fibroin | photonic crystal | photo-cross-linking | ocular prosthesis | intraocular pressure sensor

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“…Silk is cytocompitable, biodegradable, and able to stabilize labile compounds such as enzymes and drugs (18). Silk fibroin has also been studied as an optical material due to its transparency to visible light and low surface roughness, giving it the ability to conform to nanoscale structures such as diffraction gratings (19)(20)(21) or to generate 3D photonic crystals (22). Previous work involving photomodification of silk has thus far only considered surface modification of dried films (23).…”

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Laser-based three-dimensional multiscale micropatterning of biocompatible hydrogels for customized tissue engineering scaffolds

Applegate

Coburn

Partlow

et al. 2015

Proc. Natl. Acad. Sci. U.S.A.

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104

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Light-induced material phase transitions enable the formation of shapes and patterns from the nano-to the macroscale. From lithographic techniques that enable high-density silicon circuit integration, to laser cutting and welding, light-matter interactions are pervasive in everyday materials fabrication and transformation. These noncontact patterning techniques are ideally suited to reshape soft materials of biological relevance. We present here the use of relatively low-energy (< 2 nJ) ultrafast laser pulses to generate 2D and 3D multiscale patterns in soft silk protein hydrogels without exogenous or chemical cross-linkers. We find that high-resolution features can be generated within bulk hydrogels through nearly 1 cm of material, which is 1.5 orders of magnitude deeper than other biocompatible materials. Examples illustrating the materials, results, and the performance of the machined geometries in vitro and in vivo are presented to demonstrate the versatility of the approach.ultrafast lasers | biomaterials | silk | micromachining | tissue engineering

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Silk inverse opals

Cited by 237 publications

References 27 publications

A colloidoscope of colloid-based porous materials and their uses

A colloidoscope of colloid-based porous materials and their uses

Deformable and conformal silk hydrogel inverse opal

Laser-based three-dimensional multiscale micropatterning of biocompatible hydrogels for customized tissue engineering scaffolds

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