Macroporous silicon templated from silicon nanocrystallite and functionalized SiH reactive group for grafting organic monolayer

Guo, Dongjie; Wang, Jing; Tan, Wei; Xiao, Shou‐Jun; Dai, Zhendong

doi:10.1016/j.jcis.2009.04.030

Cited by 13 publications

(8 citation statements)

References 26 publications

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“…Microwave-assisted surface chemistry brings promises for shortening the reaction time, suppression of side reactions, and enhancement of the target reaction yield, etc. Accordingly, we applied microwave irradiation not only for undecanol hydrosilylation on the bare Si(1 1 1)AH surface [41], but also for subsequent click reactions taken place on Si-g-P(PEGMAAOH) polymer brushes, as shown in Scheme 1. First we prepared polymer brushes of Si-g-P(PEGMAAOH) on a planar silicon surface via atom transfer radical polymerization (ATRP) [42].…”

Section: Introductionmentioning

confidence: 99%

Microwave irradiated click reactions on silicon surfaces via derivertization of covalently grafted poly(PEGMA) brushes

Liu

Zheng

et al. 2011

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Microwave irradiated click reactions on silicon surfaces via derivertization of covalently grafted poly(PEGMA) brushes

Liu

Zheng

et al. 2011

Journal of Colloid and Interface Science

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“…2). The IR spectrum of Sample a exhibits a Si–O–Si functionalized surface, 37 where double peaks of Si–O–Si at 1160 and 1066 cm −1 are found. After second etching, the Si–O–Si band disappears while the stretching vibrations of Si–H x at 2089, 2116, and 2139 cm −1 and the bending vibrations of Si–H x at 921, 664, and 642 cm −1 appear in the IR spectrum of Sample b.…”

Section: Resultsmentioning

confidence: 98%

Fabrication and adhesion of a bio-inspired microarray: capillarity-induced casting using porous silicon mold

Guo

Zhang

et al. 2013

J. Mater. Chem. B

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Inspired by the setal microstructure found on the gecko’s toe-pads, a highly dense array of high-aspect-ratio (HAR) artificial setae has been developed with a novel mold-casting technique using a porous silicon (PSi) template. To overcome the high fluid resistance in the HAR capillary pores, the PSi template surface is modified with a monolayer coating of dimethylsilane. The coating exhibits similar chemical composition and surface energy to the precursor of the poly(dimethylsiloxane) (PDMS) replica. The compatibility between the template and the replica addresses the major challenge of molding HAR microstructures, resulting in high-resolution replicas of artificial PDMS microsetae with complicated geometry resembling a real gecko’s setae. The artificial setae are characterized by a mean radius of 1.3 μm, an aspect ratio of 35.1, and a density of ~4.7 × 105 per mm2. Results from adhesion characterizations reveal that with increasing preload, the shear adhesion of micro-setae continually increases while the normal adhesion decreases. The unique adhesion performance is caused by both van der Waals forces and the elastic resistance of PDMS setae. With further structural optimizations and the addition of an actuation mechanism, artificial setal arrays might eventually demonstrate the fascinating adhesion performances of the gecko for mimetic devices such as wall-climbing devices.

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“…To avoid the side reaction between OH and SiH, we shortened the reaction time extremely to 20 min and enhanced the reaction temperature greatly to 170 °C under microwave irradiation to form the SiC linkage between CHCH 2 and SiH. Although we have not yet understood the reaction mechanism in detail, so far the observed experimental data illustrated the acceleration of hydrosilylation reaction by microwave irradiation 37, 47. Figure 1a shows the MTR‐IR spectrum of the hydrosilylation product.…”

Section: Resultsmentioning

confidence: 99%

“…Our experience on the surface hydrosilylation chemistry encourages us to use the straightforward approach to graft UO on Si(111)H. We optimized the microwave irradiation condition to graft UO on Si(111)H, which provided the robust SiC linked alkane alcohol on silicon surface for further functionalizations 37.…”

Section: Introductionmentioning

confidence: 99%

Construction of multiple generation nitriloacetates from poly(PEGMA) brushes on planar silicon surface for enhancement of protein loading

Liu

Guo

et al. 2010

Physica Status Solidi (a)

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We constructed multiple generation nitriloacetates from poly(poly(ethylene glycol)monomethacrylate) brushes on a planar silicon surface (Si-g-P(PEGMA)) to improve the capacity of binding proteins and the biofouling repellence. Firstly the freshly etched Si(111)-H reacted with 10-undecen-1-ol under an optimized microwave irradiation condition to produce hydroxyl-terminated substrates. Secondly surface initiators for atom transfer radical polymerization were introduced by means of esterification between 2-bromo-2methylpropionyl bromide and surface hydroxyl groups. Thirdly polymer brushes of Si-g-P(PEGMA) were grown from surface initiators; then their side chain hydroxyls were carboxylated with succinic anhydride to become polymer brushes of Si-g-P(PEGMA-COOH). Finally multiple generation nitriloacetates were obtained by iterative esterification of carboxylic acids with N-hydroxysuccinimide (NHS)/N,N 0 -dicyclohexylcarbodiimide, yielding amino-reactive NHS esters, and successive amidation with aminobutyl nitrilotriacetic acid. After coordinated with Ni(II), the first to third generation nitriloacetates were applied to bind histidine-tagged thioredoxinurodilatin. All stepwise conversions were monitored with multiple transmission-reflection infrared spectroscopy (MTR-IR). The highly sensitive MTR-IR spectra provide clear stretching bands of amide v(NH) at 3441 and 3345 cm À1 , whose integrated peak areas were used to estimate the enhancement ratios of protein loading by multiple generation nitriloacetates as first generation:second generation:third generation ¼ 1:1.7:2.3.

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Macroporous silicon templated from silicon nanocrystallite and functionalized SiH reactive group for grafting organic monolayer

Cited by 13 publications

References 26 publications

Microwave irradiated click reactions on silicon surfaces via derivertization of covalently grafted poly(PEGMA) brushes

Microwave irradiated click reactions on silicon surfaces via derivertization of covalently grafted poly(PEGMA) brushes

Fabrication and adhesion of a bio-inspired microarray: capillarity-induced casting using porous silicon mold

Construction of multiple generation nitriloacetates from poly(PEGMA) brushes on planar silicon surface for enhancement of protein loading

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