Covalent crosslinking of 1-D photonic crystals of microporous Si by hydrosilylation and ring-opening metathesis polymerization

Yoon, Myeong Sik; Ahn, Kyo Han; Cheung, Ronnie W.; Sohn, Honglae; Link, Jamie R.; Cunin, Frédérique; Sailor, Michael J.

doi:10.1039/b300937h

Cited by 43 publications

(16 citation statements)

References 28 publications

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“…If oxidized porous Si is used in the reaction, the lack of Si-H surface groups eliminates the possibility of covalent Si-C bond formation between the polymer and the template. Composites with lower mechanical and chemical stability result [152]. Thus both the weaving of a soft polymer network into the pores and the covalent attachment of this polymer to the matrix combine to provide the robust chemical and mechanical properties.…”

Section: Locking the Polymer In A Porous Si Templatementioning

confidence: 99%

“…The chemical and mechanical stability of the chemically crosslinked porous Si matrix is significantly improved relative to the porous Si film alone. After [152]. Schematic demonstrating the change in a reflectance spectrum from a single layer of porous Si upon introduction of a molecular species into the porous matrix.…”

Section: Summary and Prospectsmentioning

confidence: 99%

“…Chemical crosslinking of a porous Si template can be achieved with the correct choice of polymerization conditions. First demonstrated in 2003 [152], such methods take advantage of the reactivity of the hydride-terminated porous Si surface. For example, porous Si treated with a ruthenium ring-opening metathesis polymerization catalyst followed by norbornene produces a flexible, stable composite in which poly(norbornene) is covalently attached to the porous Si matrix (Fig.…”

Section: Locking the Polymer In A Porous Si Templatementioning

confidence: 99%

“…Two synthetic approaches have emerged: either the polymer is synthesized within the porous matrix [151][152][153][154], or a pre-formed polymer is infused into the matrix by melt-or solution-casting [46,47,146,147,155]. For drug delivery applications, it is important to use a biocompatible polymer, and hydrogels are of particular interest [29,150].…”

Section: Porous Si As a Templatementioning

confidence: 99%

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Porous silicon in drug delivery devices and materials☆

Anglin

Cheng

Freeman

et al. 2008

Advanced Drug Delivery Reviews

801

618

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Porous Si exhibits a number of properties that make it an attractive material for controlled drug delivery applications: The electrochemical synthesis allows construction of tailored pore sizes and volumes that are controllable from the scale of microns to nanometers; a number of convenient chemistries exist for the modification of porous Si surfaces that can be used to control the amount, identity, and in vivo release rate of drug payloads and the resorption rate of the porous host matrix; the material can be used as a template for organic and biopolymers, to prepare composites with a designed nanostructure; and finally, the optical properties of photonic structures prepared from this material provide a self-reporting feature that can be monitored in vivo. This paper reviews the preparation, chemistry, and properties of electrochemically prepared porous Si or SiO 2 hosts relevant to drug delivery applications.

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Section: Locking the Polymer In A Porous Si Templatementioning

confidence: 99%

Section: Summary and Prospectsmentioning

confidence: 99%

Section: Locking the Polymer In A Porous Si Templatementioning

confidence: 99%

Section: Porous Si As a Templatementioning

confidence: 99%

See 2 more Smart Citations

Porous silicon in drug delivery devices and materials☆

Anglin

Cheng

Freeman

et al. 2008

Advanced Drug Delivery Reviews

801

618

View full text Add to dashboard Cite

show abstract

“…Figure 11 shows the SEM and photo images of lightweight mesoporous Si membrane. Such membrane infiltrated with polymers can attain an excellent flexibility [75] comparable with many plastic substrates. Furthermore, porous Si allows introducing photonic bandgap structure in the device, reducing reflection and increasing light trapping, which is of utmost importance for thin film PVs.…”

Section: Summary and Strategies To Improve Pv Performance Of Hybrid Smentioning

confidence: 99%

Organic / IV, III-V Semiconductor Hybrid Solar Cells

Ong

Levitsky

2010

Energies

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Abstract:We present a review of the emerging class of hybrid solar cells based on organic-semiconductor (Group IV, III-V), nanocomposites, which states separately from dye synthesized, polymer-metal oxides and organic-inorganic (Group II-VI) nanocomposite photovoltaics. The structure of such hybrid cell comprises of an organic active material (p-type) deposited by coating, printing or spraying technique on the surface of bulk or nanostructured semiconductor (n-type) forming a heterojunction between the two materials. Organic components include various photosensitive monomers (e.g., phtalocyanines or porphyrines), conjugated polymers, and carbon nanotubes. Mechanisms of the charge separation at the interface and their transport are discussed. Also, perspectives on the future development of such hybrid cells and comparative analysis with other classes of photovoltaics of third generation are presented.

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Confinement of Thermoresponsive Hydrogels in Nanostructured Porous Silicon Dioxide Templates

Segal

Perel'man

Cunin

et al. 2007

Adv Funct Materials

116

164

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A thermoresponsive hydrogel, poly(N‐isopropylacrylamide) (poly(NIPAM)), is synthesized in situ within an oxidized porous Si template, and the nanocomposite material is characterized. Infiltration of the hydrogel into the interconnecting nanoscale pores of the porous SiO2 host is confirmed by scanning electron microscopy. The optical reflectivity spectrum of the nanocomposite hybrid displays Fabry–Pérot fringes characteristic of thin film interference, enabling direct, real‐time observation of the volume phase transition of the confined poly(NIPAM) hydrogel. Reversible optical reflectivity changes are observed to correlate with the temperature‐dependent volume phase transition of the hydrogel, providing a new means of studying nanoscale confinement of responsive hydrogels. The confined hydrogel displays a swelling and shrinking response to changes in temperature that is significantly faster than that of the bulk hydrogel. The porosity and pore size of the SiO2 template, which are precisely controlled by the electrochemical synthesis parameters, strongly influence the extent and rate of changes in the reflectivity spectrum of the nanocomposite. The observed optical response is ascribed to changes in both the mechanical and the dielectric properties of the nanocomposite.

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Covalent crosslinking of 1-D photonic crystals of microporous Si by hydrosilylation and ring-opening metathesis polymerization

Cited by 43 publications

References 28 publications

Porous silicon in drug delivery devices and materials☆

Porous silicon in drug delivery devices and materials☆

Organic / IV, III-V Semiconductor Hybrid Solar Cells

Confinement of Thermoresponsive Hydrogels in Nanostructured Porous Silicon Dioxide Templates

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