Formation and Aqueous Surface Wettability of Polysiloxane Nanofibers Prepared via Surface Initiated, Vapor-Phase Polymerization of Organotrichlorosilanes

Rollings, De-ann E; Tsoi, Shufen; Sit, Jeremy C.; Veinot, Jonathan G. C.

doi:10.1021/la063604a

Cited by 50 publications

(54 citation statements)

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“…The developed model especially aims to explain the phase during which the deposited film translates into the nanofilaments. The presented nanostructures are synthesized similarly to previously reported solid SNFs, [12][13][14][15][16][17][18][19][20][21][22][23][24][25] and under scanning electron microscope (SEM), they appear exactly similar, yet detailed transmission electron microscope (TEM) analysis reveals them to exhibit a hollow core. The h-SNFs also differ from the previously reported polysiloxane nanotubes 26 in that h-SNFs are topographically similar to solid SNFs, while the nanotubes exhibit a different morphology.…”

Section: Introductionmentioning

confidence: 60%

“…9,16,18,29 Deposition-grade methyltrichlorosilane (MTCS) was acquired from Sigma-Aldrich (St. Louis, MO, USA) and used as received. It was stored and used exclusively in a dry nitrogen atmosphere.…”

Section: Experimental and Simulationsmentioning

confidence: 99%

“…12,13 In addition, SNFs have been shown to retain the CassieBaxter wetting state even when subjected under pressure. 9 In 2006-2007, three groups independently reported on the first successful synthesis of the 1D polysiloxane nanostructures [14][15][16] and later more studies emerged to deepen the understanding of the process parameters, 12,13,[17][18][19][20][21][22][23][24][25] and recently, also larger tubular polysiloxane structures were introduced. 26 A few growth models for the SNFs have been proposed until this day.…”

Section: Introductionmentioning

confidence: 99%

“…Finally, the lateral expansion was fully blocked and growth continued in one direction. Rollings and Veinot 18 systematically expanded their original study 16 using the atmospheric gas-phase process and introduced a growth model hypothesis. They reasoned Hollow polysiloxane nanostructures based on pressure-induced film expansion Korhonen, Huhtamäki, Verho and Ras that the hydrolyzed molecules could not bond to the surface with all three reactive sites, which left one or two hydroxyls available for cross-linking.…”

Section: Introductionmentioning

confidence: 99%

“…9 In 2006-2007, three groups independently reported on the first successful synthesis of the 1D polysiloxane nanostructures [14][15][16] and later more studies emerged to deepen the understanding of the process parameters, 12,13,17-25 and recently, also larger tubular polysiloxane structures were introduced.…”

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confidence: 99%

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Hollow polysiloxane nanostructures based on pressure-induced film expansion

Korhonen¹,

Huhtamäki²,

Verho³

et al. 2014

Surface Innovations

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IntroductionSuperhydrophobic surfaces comprise a class of materials characterized by extreme water repellency, a low roll-off angle and self-cleaning ability.1-5 These ultimate properties are achieved by combining roughness with a low-energy surface.1-3,6-9 The composite CassieBaxter wetting state 10 is connected to superhydrophobicity through high contact angles and low roll-off angles. Industrial applications concerning superhydrophobicity are currently only slightly behind the academic state-of-the-art, which makes the field interesting from the point of view of basic research as well as applications, provided the structures are able to cope with both chemical and mechanical wear and tear. 11An interesting approach using 1D nanostructures, denoted as silicone nanofilaments (SNFs), has shown excellent properties as well as resilience toward chemical and also mechanical wear. 12,13 In addition, SNFs have been shown to retain the CassieBaxter wetting state even when subjected under pressure.9 In 2006-2007, three groups independently reported on the first successful synthesis of the 1D polysiloxane nanostructures [14][15][16] and later more studies emerged to deepen the understanding of the process parameters, 12,13,17-25 and recently, also larger tubular polysiloxane structures were introduced. 26A few growth models for the SNFs have been proposed until this day. [18][19][20]24,27,28 However, these models are challenged by our observation of hollow polysiloxane nanostructures. Gao and McCarthy 27 were the first to propose a growth mechanism for SNFs, which they synthesized in solution phase from a trimethylchlorosilane/tetrachlorosilane (TMCS/TCS) azeotrope. In their model, TCS molecules cross-linked and formed 3D structures, yet occasionally TMCS molecules terminated the growth. Finally, the lateral expansion was fully blocked and growth continued in one direction. Rollings and Veinot 18 systematically expanded their original study 16 using the atmospheric gas-phase process and introduced a growth model hypothesis. They reasoned

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Section: Introductionmentioning

confidence: 60%

Section: Experimental and Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Hollow polysiloxane nanostructures based on pressure-induced film expansion

Korhonen¹,

Huhtamäki²,

Verho³

et al. 2014

Surface Innovations

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1D∼3D Nano‐engineered Biomaterials for Biomedical Applications

Chen

2012

Integrated Biomaterials for Biomedical Technology

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High‐Temperature Self‐Assembly of Peptides into Vertically Well‐Aligned Nanowires by Aniline Vapor

2008

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The self-assembly of peptide-based building blocks into nanostructures is an attractive route for fabricating novel bio-inspired materials because of their capacity for molecular recognition and functional flexibility as well as the mild conditions required in the fabrication process.[1-4] Among various peptide-based building blocks forming nanostructures, the simplest building blocks are aromatic dipeptides like diphenylalanine, which can readily self-assemble into nanotubes in aqueous solutions at ambient conditions. [2,[5][6][7] According to literature, the peptide nanotubes could be used in versatile applications for casting conducting metal nanowires, [8] enhancing the sensitivity of electrochemical detection of biomolecules, [9] and fabricating nano-fluidic channels [10] or peptide liquid crystals.[11]Although the self-assembly of peptides into nanostructured materials had been extensively studied, little progress had been made in the alignment and positioning of peptide nanostructures on a solid surface. Major obstacles include the complexity of current 'solution-based' approaches to peptide nanofabrication, causing dispersion and agglomeration problems, [6] which also require the chemical modification of surface and peptide nanostructures. [12] In the present study, we report a novel solid-phase growth of crystalline peptide nanowires at high temperatures driven by aniline vapor under anhydrous conditions. The formation of vertically well-aligned peptide nanowires on a solid surface were investigated through multiples tools, such as X-ray diffraction (XRD), scanning electron microscopy (SEM), matrix-assisted laser desorption/ ionization time-of-flight (MALDI-TOF) mass spectrometry, and thermal analytical tools like the differential scanning calorimeter (DSC) and thermogravimetric analysis (TGA). We prepared an amorphous peptide thin film by drying a drop of 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP) solution containing diphenylalanine on a Si substrate. We conducted the experiment under strictly anhydrous conditions in a vacuum desiccator because water vapor could affect the final surface structure of the peptide thin film.[13] We could control the thickness of the film from a few mm down to $50 nm precisely by simply changing the diphenylalanine concentration in HFIP solution. According to our SEM and XRD analysis, the thin peptide film exhibited no surface features ( Fig. 1) and no characteristic diffraction peaks (Fig. 2), which indicate the 'amorphous' nature of the film. From the amorphous peptide film as a starting point, we were able to successfully grow vertically well-aligned peptide nanowires by aging the film at temperatures above 100 8C with aniline vapor. Figure 1 shows the electron micrographs of vertically wellaligned, rigid peptide nanowires. Peptide nanowires were uniformly formed over the entire region of the whole surface (10 mm Â 10 mm). The average diameter of the nanowires measured by SEM was found to be about 150 nm, but if we consider the effect of conductive coating for SEM, the act...

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Formation and Aqueous Surface Wettability of Polysiloxane Nanofibers Prepared via Surface Initiated, Vapor-Phase Polymerization of Organotrichlorosilanes

Cited by 50 publications

References 51 publications

Hollow polysiloxane nanostructures based on pressure-induced film expansion

Hollow polysiloxane nanostructures based on pressure-induced film expansion

1D∼3D Nano‐engineered Biomaterials for Biomedical Applications

High‐Temperature Self‐Assembly of Peptides into Vertically Well‐Aligned Nanowires by Aniline Vapor

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