Hydrophobicity of amorphous silica-based inorganic-organic hybrid materials derived from perhydropolysilazane chemically modified with alcohols

Sokri, Mohd Nazri Mohd; Onishi, Takahiro; Daiko, Yusuke; Honda, Sawao; Iwamoto, Yuji

doi:10.1016/j.micromeso.2015.05.039

Cited by 8 publications

(4 citation statements)

References 31 publications

(37 reference statements)

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“…The amorphous branched plasma-deposited film structure contains strained Si-O-Si bonding groups favoring the formation of near-neighbor pairs of silanol (Si-OH) groups [180]. Such polar surface spots promote attachment of water molecules and subsequent intrusion forming nanochannels by further localized hydrolysis reactions and water attachment [181,182]. Such water-filled finger-like channels reach a depth of about 10 nm in the PPF when immersed in water over several hours as revealed by neutron reflectometry (figure 15).…”

Section: Deposition Of Polymer-like Soft Plasma Coatingsmentioning

confidence: 99%

Plasma surface engineering for manmade soft materials: a review

Hegemann¹,

Gaiser²

2021

J. Phys. D: Appl. Phys.

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Manmade soft materials are important in a wide range of technological applications and play a key role in the development of future technologies, mainly at the interface of synthetic and biological components. They include gels and hydrogels, elastomers, structural and packaging materials, micro and nanoparticles as well as biological materials. Soft materials can be distinguished from liquids owing to their defined shape and from hard materials by the deformability of their shape. This review article provides an overview of recent progress on the plasma engineering and processing of softer materials, especially in the area of synthesis, surface modification, etching, and deposition. The article aims to demonstrate the extensive range of plasma surface engineering as used to form, modify, and coat soft materials focusing on material properties and potential applications. In general, the plasma provides highly energetic, non-equilibrium conditions at material surfaces requiring to adjust the conditions for plasma-surface interaction to account for the specifics of soft matter, which holds independent of the used plasma source. Plasma-induced crosslinking and polymerization of liquids is discussed to transform them into gel-like materials as well as to modify the surface region of viscous liquids. A major field covers the plasma surface engineering of manmade soft materials with the help of gaseous reactive species yielding ablation, nanostructuring, functionalization, crosslinking, stiffening, and/or deposition to obtain demanded surface properties or adhesion to dissimilar materials. Finally, plasma engineering of rigid materials is considered to induce surface softening for the enhanced contact with tissues, to allow interaction in aqueous media, and to support bonding to soft matter. The potential and future perspectives of plasma engineering will be discussed in this review to contribute to a higher knowledge of plasma interaction with sensitive materials such as soft matter.

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Section: Deposition Of Polymer-like Soft Plasma Coatingsmentioning

confidence: 99%

Plasma surface engineering for manmade soft materials: a review

Hegemann¹,

Gaiser²

2021

J. Phys. D: Appl. Phys.

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“…Here, perhydropolysilazane (PHPS) and PDMS are adopted, which are an ideal polymeric precursor for uniform-rigid silica film and a well-recognized low-surface-tension material, respectively. A new polymeric precursor was first synthesized with dihydroxyalkyl-terminated polydimethylsiloxane (HOC-PDMS) and PHPS via the reaction between the −OH group in PDMS and the Si–N/Si–H bonds in PHPS (Figure S1 in the Supporting Information). , Then, SPNC was prepared by coating the polymeric precursor on substrates, followed by vacuum ultraviolet (VUV) irradiation at room temperature (Figure a). VUV irradiation converts PHPS moiety into a dense inorganic silica via a photocleave and oxidation process, while the PDMS maintains in silica continuous phase (Figure S2 in the Supporting Information). − By tuning ratio of PDMS to PHPS in the copolymer, inorganic–organic silica/PDMS coatings were prepared, denoted as C1–C50, according to the ratio of PDMS in silica.…”

Section: Resultsmentioning

confidence: 99%

“…A new polymeric precursor was first synthesized with dihydroxyalkyl-terminated polydimethylsiloxane (HOC-PDMS) and PHPS via the reaction between the −OH group in PDMS and the Si−N/Si−H bonds in PHPS (Figure S1 in the Supporting Information). 26,27 Then, SPNC was prepared by coating the polymeric precursor on substrates, followed by vacuum ultraviolet (VUV) irradiation at room temperature (Figure 1a). VUV irradiation converts PHPS moiety into a dense inorganic silica via a photocleave and oxidation process, while the PDMS maintains in silica continuous phase (Figure S2 in the Supporting Information).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Inorganic–Organic Silica/PDMS Nanocomposite Antiadhesive Coating with Ultrahigh Hardness and Thermal Stability

Guo

Liang

et al. 2023

ACS Appl. Mater. Interfaces

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Antiadhesive surfaces have been gaining continuous attention, because of the scientific and industrial significance. Slippery surfaces and antismudge coatings with antiadhesive behavior have been readily designed and prepared. However, improving robustness of the surfaces, especially the simultaneous demonstration of features of high hardness, excellent adhesion to different substrates, and high thermal stability, is constantly challenging. Herein, we present a silica/polydimethylsiloxane (PDMS) nanocomposite coating (SPNC), wherein silica acts as a consecutive phase and nanophased PDMS is covalently embedded. The nanoconfined PDMS phase exhibits enhanced thermal stability and endows SPNC with slippery behavior; meanwhile, enrichment of PDMS on the surface renders a gradient composition of the coating. Accordingly, the inorganic−organic SPNC simultaneously displays a high nanoindentation hardness of 3.07 GPa and a pencil hardness over 9H, outstanding thermal stability of the slippery performance up to 400 °C, and excellent adhesion strength to different substrates. Additionally, SPNC exhibits high optical transparency, flexibility, resistance to bacterial clone, and chemical corrosion. With the scalable fabrication process, it can be envisioned that the antiadhesive coating with unprecedented comprehensive merits in this work has significant potentials for large-area applications, especially under severe service environments.

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“…To examine the significantly high hydrophobic character of the PCSs in more details, FT-IR spectroscopic analysis was performed on the PCS weak broad peak around 3400 cm −1 attributed to intermolecular hydrogen-bonded silanol (Si-OH) group and adsorbed water molecules, while the sharp peak centered at 3674 cm −1 correspond to free Si-OH group [22]. As discussed previously [23,30,31], the polar Si-OH group acted as a preferential adsorption site for water molecules. Then, density of the free Si-OH group in each sample was evaluated by measuring the relative ratio of the FT-IR absorption peak intensities: ISi-OH at 3674 cm −1 /ISi-CH2-Si at 1020 cm −1 .…”

Section: Hydrophobicity Of As-received Pcssmentioning

confidence: 99%

Superhydrophobic polycarbosilane membranes for purification of solar hydrogen

Kubo

Okibayashi

Kojima

et al. 2021

Separation and Purification Technology

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Superhydrophobic membranes composed of an organic-inorganic hybrid polymer, namely polycarbosilane (PCS) with Mw of 4-8.9 ×10 3 , were formed on a mesoporous γ-Al 2O3-modified α-Al2O3 porous support. Under dry condition at 50 • C, the supported PCS membranes exhibited H2 permeance of 1.1-1.6 ×10 −6 mol⋅m −2 ⋅s −1 ⋅Pa −1 and H2/N2 selectivity of 9.7-12.6 together with unique H2/He selectivity of 1.4-1.6. Even under saturated humidity at 50 • C, H2 permeance remained at 7.7 ×10 −8 mol −1 m −2 s −1 Pa −1 with improved H2/N2 selectivity of 26. Moreover, when the measurements were performed using a H2-N2 (2:1) mixed feed gas as a simulated syngas produced by novel solar hydrogen production systems, the H2 permeance almost unchanged, while the N2 permeance was below the limit of detection. These results revealed a great potential of PCSs to develop novel H 2selective membranes for purifying solar hydrogen under high-humidity conditions around 50 • C. Further study on the gas permeation behaviors of He, H2 and N2 suggested that the enhanced H2/N2 selectivity under the highhumidity conditions could be explained by the synergistic effect of preferential H 2 permeation through the dense PCS network governed by the solid state diffusion mechanism and blockage of N 2 permeation through micropore channels within the PCS network by the permeate H2O-induced plugging at around the hetero interface between the superhydrophobic PCS and highly hydrophilic γ-Al 2O3.

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Hydrophobicity of amorphous silica-based inorganic-organic hybrid materials derived from perhydropolysilazane chemically modified with alcohols

Cited by 8 publications

References 31 publications

Plasma surface engineering for manmade soft materials: a review

Plasma surface engineering for manmade soft materials: a review

Inorganic–Organic Silica/PDMS Nanocomposite Antiadhesive Coating with Ultrahigh Hardness and Thermal Stability

Superhydrophobic polycarbosilane membranes for purification of solar hydrogen

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