AFM and contact angle investigation of growth and structure of pp-HMDSO thin films

Grimoldi, Elisa; Zanini, Stefano; Siliprandi, R; Riccardi, C.

doi:10.1140/epjd/e2009-00117-6

Cited by 25 publications

(30 citation statements)

References 24 publications

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“…The absorbance at 3350 cm −1 is characteristic for stretching of the N-H bond, while the doublet at 2350 cm −1 is attributed to CO2 species [10]. As in the case of unmodified PDMS, the presence of methyl moieties in the modified surface is confirmed by an absorption band at 1410 cm −1 , related to CH3 asymmetric bending in Si-CH3 bonds, and 2965 and 2906 cm −1 bands, which are characteristic for asymmetric stretching and symmetric stretching of the CH3 group, respectively [14,15]. A low intensity band at 1454 cm −1 is assigned to the asymmetric bending vibrations of the CH2 group in the Si-CH2-CH2-Si link that play a substantial role in the cross-linking process during HMDS polymerization [15].…”

Section: Resultsmentioning

confidence: 77%

Control of Polydimethylsiloxane Surface Hydrophobicity by Plasma Polymerized Hexamethyldisilazane Deposition

2019

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The properties of a polydimethylsiloxane (PDMS) surface were modified by a one-step deposition of plasma polymerized hexamethyldisilazane (pp-HMDS) by the arc discharge method. Scanning electron microscopy, atomic force microscopy, and Fourier-transform infrared spectroscopy analytical techniques were employed for morphological, structural, and chemical characterization of the pp-HMDS modified PDMS surface. The changes in PDMS substrate wetting properties were evaluated by means of contact angle measurements. The unmodified PDMS surface is hydrophobic with a contact angle of 122°, while, after pp-HMDS film deposition, a dual-scale roughness PDMS surface with contact angle values as high as 170° was obtained. It was found that the value of the contact angle depends on the plasma processing time. Chemically, the pp-HMDS presents methyl moieties, rendering it hydrophobic and making it an attractive material for creating a superhydrophobic surface, and eliminating the need for complex chemical routes. The presented approach may open up new avenues in design and fabrication of superhydrophobic and flexible organosilicon materials with a self-cleaning function.

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Section: Resultsmentioning

confidence: 77%

Control of Polydimethylsiloxane Surface Hydrophobicity by Plasma Polymerized Hexamethyldisilazane Deposition

2019

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“…Many studies showed that deposition time can lead to an increase in the thickness of the coating [77,78,89]. The results of 25 minute deposition time (contact angle and contact angle hysteresis) were satisfactory, however.…”

Section: ïV-3-optimization Of Plasma Process Parametersmentioning

confidence: 99%

“…Due to this assets, many studies have preferred the plasma polymerization of different organosilicon precursors in order to create a hydrophobic coating [41,[75][76][77][78][79][80][81][82].…”

Section: Ii-4-1-influence Of Precursor Chemistrymentioning

confidence: 99%

“…Several plasma parameters can affect the chemistry of the resulting film, such as input power, distance from monomer inlet, deposition time, monomer flow rate, gas flow rate, temperature, and pressure. Many studies report the influence of these individual on water-repellency of a coating [77,78,144,145]. In the present study, the influences of four plasma parameters are studied using the Grey-based Taguchi method in order to optimize the wettability of the resulting thin film.…”

Section: Iv-2-process Of Plasma Polymerized Hmdso Coatingmentioning

confidence: 99%

“…27 Figure 11.13: Molecular structure of a) Acrylic acid (unsaturated), b) Perfluorohexane (linear saturated) and c) Octafluorotoluene (cyclic unsaturated) [65] .28 Figure 11.14: R.F. Variation of contact angles for the different plasma precursors deposited a) FAS-3, b) FAS-13, and c) FAS-17 [66] 29 Figure 11.15: AFM Images of a) untreated silicon wafer, b) PP-HMDSO coating deposited at 30 sec deposition and c) PP-HMDSO film at 5 min deposition [77]..... 32 Figure 11.16: Advancing and receding contact angle of PP-HMDSO film at different deposition times on a) wafer silicon b) polyethylene [77] 33 Figure 11.17: Contact angle of PP-Hexafluoropropylene coating on poly(vinyl chloride) tube as a function of deposition time [64] 34 Figure 11.18: FT-IR spectra of PP-HMDSO films deposited with different monomer concentrations (discharge power 9.5 W, film thickness 700 nm) [89] 35 Figure 11.19: SEM images of the coatings at a) 1, b) 3, c) 5, d) 8, e) 11, and f) 18 cm from the gas inlet [73] .....36 Figure 11.20: Static, advancing, and receding contact angle vs. axial position of samples from the gas inlet [73] • ..37 [95]. ...43 Figure 11.26: X-ray photoelectron spectroscopy F/C ratio of plasma-polymerized fluorocarbon coatings deposited on stainless steel as a function of immersion time in distilled water [105] 44 Figure 11.27: Atomic force microscopy images 2^2 (im 2 of plasma-polymerized thin coating after: (a) 0 week, (b) 1 week, (c) 2 weeks, (d) 3 weeks and (e) 4 weeks of ageing in D.I.…”

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confidence: 99%

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Development of nano-structured icephobic surfaces based on plasma polymerization /

Mobarakeh¹

2014

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Accumulated ice on exposed surfaces leads to operational difficulties and extensive maintenance for power transmission lines, antennas, aircraft, ships, and ground transportation vehicles.In the present study, the low pressure plasma polymerized Hexamethyldisiloxane (PP-HMDSO) film is deposited on aluminum surfaces to create a superhydrophobic coating with icephobic properties. Prior to the deposition of this low surface energy coating, aluminum surfaces were anodized or immersed in boiling water to make micro/nano structured surfaces.Plasma parameters were optimized in order to find the best optimum conditions for having high static contact angle and low contact angle hysteresis. Hence, the Grey-based Taguchi method was used as one of the Design of Experiment (DOE) techniques. The stability of coatings was studied under accelerated aging conditions such as UV degradation, immersion in distilled water and different pH solutions, and several icing/deicing cycles. It was observed that the PP-HMDSO coatings are quite stable against UV exposure and immersion in distilled water. However, the icephobicity of the PP-HMDSO coating deposited on the anodized aluminum decreased after fifteen icing/de-icing cycles.The stability of the developed coating was improved against several icing/de-icing cycles by increasing the deposition time of plasma polymerized coating from 15 to 25 minutes. The results showed that increasing the deposition time of plasma polymerization leads to decrease of the ice adhesion strength of coatings on anodized aluminum while it has no significant effect on the PP-HMDSO coating deposited on a water-treated aluminum surface. Finally, the superhydrophobic PP-HMDSO coating also provides anti-corrosion protection for the aluminum substrate.

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Hydrophilicity and Hydrophobicity Control of Plasma‐Treated Surfaces via Fractal Parameters

Piferi

Bazaka

D'Aversa

et al. 2021

Adv Materials Inter

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It is still problematic to define a direct relationship between specific properties of a nanostructured surface (e.g., wettability) and its morphology. Not surprisingly, scientists continue to explore en masse the cut‐and‐try method. In this work, new insights are presented into the correlation of functional properties of the complex nanocomposites with their morphological characteristics. Using polyethylene‐terephthalate (PET) as a model material due to its importance and wide use in experiments, super‐hydrophilic nanocomposites amenable to be used in a variety of industrial applications are first developed, by exposing PET samples to oxygen plasma under controlled conditions. The morphology of the surfaces is confirmed using AFM and SEM techniques, and wettability in air and its oleophobic properties in water using contact angle and roll‐off measurements. Next, different analytical tools such as Minkowski connectivity (Euler‐Poincaré characteristic), Hough distributions and 2D FFT are applied to study ordering, connectivity, and fractal characteristics of the samples. It is concluded that fractal dimension, along with ordering and connectivity, are among the major characteristics of the nanocomposite that determine many important physical and chemical properties of the functional nanomaterials, and the fractal dimension could be a target morphological feature to inform the design of fabrication technology.

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AFM and contact angle investigation of growth and structure of pp-HMDSO thin films

Cited by 25 publications

References 24 publications

Control of Polydimethylsiloxane Surface Hydrophobicity by Plasma Polymerized Hexamethyldisilazane Deposition

Control of Polydimethylsiloxane Surface Hydrophobicity by Plasma Polymerized Hexamethyldisilazane Deposition

Development of nano-structured icephobic surfaces based on plasma polymerization /

Hydrophilicity and Hydrophobicity Control of Plasma‐Treated Surfaces via Fractal Parameters

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