Effects of Nanoscale Surface Texturing on Self-Healing of Boundary Lubricant Film via Lateral Flow

Hsiao, Erik; Barthel, Anthony J.; Kim, Seong H.

doi:10.1007/s11249-011-9847-x

Cited by 12 publications

(13 citation statements)

References 25 publications

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“…To observe the humidity effects on friction and wear of glass surfaces, a home‐built pin‐on‐disk tribometer was used. The details of the system can be found elsewhere . Pyrex (borosilicate) balls with a 3 mm diam were purchased from (Specialty Glass Products Inc, Willowgrove, PA) and cleaned with ethanol.…”

Section: Methodsmentioning

confidence: 99%

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Hydronium Ions in Soda‐lime Silicate Glass Surfaces

et al. 2012

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The presence of leachable alkali ions, or their hydrated sites in the glass, is believed to be a determining factor for the interfacial water structure at the glass surface, influencing the surface properties of glass. The interfacial water structure on soda‐lime silicate glass in humid ambience at room temperature was analyzed with sum‐frequency‐generation (SFG) vibration spectroscopy, which can probe the interfacial water layer without spectral interferences from the gas phase water. The soda‐lime glass surface exposed to water vapor shows three sharp SFG peaks at 3200, 3430, and 3670 cm−1 in SFG, which is drastically different from the SFG spectra of the water layers on the fused quartz glass surface and the liquid water/air interface. The sharp peak at 3200 cm−1 is believed to be associated with the hydronium ions in the Na+‐leached silicate glass surface. The 3200 cm−1 peak intensity varies with the relative humidity, indicating its equilibrium with the gas phase water. It is proposed that the hydronium ions in the Na+‐leached sites produce compressive stress in the silicate glass surface; thus the growth of hydronium ions with increasing humidity might be responsible for the increased wear resistance of soda‐lime glass surfaces in near‐saturation humidity conditions.

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Section: Methodsmentioning

confidence: 99%

“…The details of the system can be found elsewhere. 15,16 Pyrex (borosilicate) balls with a 3 mm diam were purchased from (Specialty Glass Products Inc, Willowgrove, PA) and cleaned with ethanol. The applied load was 0.2 N, which corresponded to a maximum Hertzian contact pressure of $ 200 MPa.…”

Section: Methodsmentioning

confidence: 99%

Hydronium Ions in Soda‐lime Silicate Glass Surfaces

et al. 2012

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“…The details of the experimental system can be found in earlier publications. 30,31 The glass substrate tested in this study is a sodium silicate glass (Si O 2 :Na 2 O:Al 2 O 3 = 76.7:21.3:2.0 mol%), which were prepared in-house by melting raw materials of sodium carbonate, calcined alumina (Almatis), and silica (Berkeley fine sand, US Silica) at 1650°C. The Pyrex glass balls (McMaster-Carr, OD 2.4 mm) were used as a counter surface.…”

Section: Experimental Ball-on-flat Wear Test In Controlled Humiditymentioning

confidence: 99%

Atomistic understanding of surface wear process of sodium silicate glass in dry versus humid environments

et al. 2020

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Understanding surface reactions of silicate glass under interfacial shear is critical as it can provide physical insights needed for rational design of more durable glasses. Here, we performed reactive molecular dynamics (MD) simulations with ReaxFF potentials to study the mechanochemical wear of sodium silicate glass rubbed with amorphous silica in the absence and presence of interfacial water molecules. The effect of water molecules on the shear‐induced chemical reaction at the sliding interface was investigated. The dependence of wear on the number of interfacial water molecules in ReaxFF‐MD simulations was in reasonable agreement with the experimental data. Confirming this, the ReaxFF‐MD simulation was used to find further details of atomistic reaction dynamics that cannot be obtained from experimental investigations only. The simulation showed that the severe wear in the dry condition is due to the formation of interfacial Sisubstrate–O–Sicounter_surface bond that convey the interfacial shear stress to the subsurface and the presence of interfacial water reduces the interfacial bridging bond formation. The leachable sodium ions facilitate surface reactions with water‐producing hydroxyl groups and their key role in the hydrolysis reaction is discussed.

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“…Laser texturing of different materials, including glasses, semiconductors, polymers and metals enables the production of surfaces with superior wetting properties, which may be exhibited as extreme water repellency [19,25,26], self-healing [27], self-cleaning [28], anti-icing [29], reduced drag in laminar and turbulent flows [30], significantly enhanced heat transfer [31,32], improved corrosion resistance [33,34] and biodegradability [24]. The majority of these studies were made by ultrashort, i.e., pico-/femtosecond lasers.…”

Section: Introductionmentioning

confidence: 99%

Long-Term Influence of Laser-Processing Parameters on (Super)hydrophobicity Development and Stability of Stainless-Steel Surfaces

et al. 2018

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Controlling the surface wettability represents an important challenge in the field of surface functionalization. Here, the wettability of a stainless-steel surface is modified by 30-ns pulses of a Nd:YAG marking laser (λ = 1064 nm) with peak fluences within the range 3.3–25.1 J cm−2. The short- (40 days), intermediate- (100 days) and long-term (1 year) superhydrophilic-to-(super)hydrophobic transition of the laser-textured surfaces exposed to the atmospheric air is examined by evaluating its wettability in the context of the following parameters: (i) pulse fluence; (ii) scan line separation; (iii) focal position and (iv) wetting period due to contact angle measurements. The results show that using solely a short-term evaluation can lead to wrong conclusions and that the faster development of the hydrophobicity immediately after laser texturing usually leads to lower final contact angle and vice versa, the slower this transition is, the more superhydrophobic the surface is expected to become (possibly even with self-cleaning ability). Depending on laser fluence, the laser-textured surfaces can develop stable or unstable hydrophobicity. Stable hydrophobicity is achieved, if the threshold fluence of 12 J cm−2 is exceeded. We show that by nanosecond-laser texturing a lotus-leaf-like surface with a contact angle above 150° and roll-off angle below 5° can be achieved.

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Effects of Nanoscale Surface Texturing on Self-Healing of Boundary Lubricant Film via Lateral Flow

Cited by 12 publications

References 25 publications

Hydronium Ions in Soda‐lime Silicate Glass Surfaces

Hydronium Ions in Soda‐lime Silicate Glass Surfaces

Atomistic understanding of surface wear process of sodium silicate glass in dry versus humid environments

Long-Term Influence of Laser-Processing Parameters on (Super)hydrophobicity Development and Stability of Stainless-Steel Surfaces

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