Tribological performance of porous silicon hydrophobic and hydrophilic surfaces

Robledo-Taboada, Luis Humberto; Jiménez-Jarquín, Javier Francisco; Chiñas‐Castillo, Fernando; Méndez-Blas, Antonio; Camacho‐López, Santiago; Rosa, L. Serrano de la; Caballero-Caballero, Magdaleno; Alavéz-Ramírez, Rafael; Bartolo-Alemán, Martha Hilaria; Enriquez-Porras, Efren Normando

doi:10.1016/j.jmrt.2022.06.094

Cited by 5 publications

(5 citation statements)

References 37 publications

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“…Regarding contact angles measurements, Figure a, binary solvent systems lead to a hydrophilic behavior, with contact angles of 74° and 80° for the 70:30 (CF:DMF) and 85:15 (CF:DMF), respectively. On the other hand, PHBV dissolved in DMF or DMSO presented a hydrophobic behavior, with contact angles of 109° and 107°, respectively; the results are related to the differences in porosity and surface rugosity, and samples with higher porosity show a more hydrophobic behavior …”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…On the other hand, PHBV dissolved in DMF or DMSO presented a hydrophobic behavior, with contact angles of 109°and 107°, respectively; the results are related to the differences in porosity and surface rugosity, and samples with higher porosity show a more hydrophobic behavior. 41 The FTIR-ATR spectra (Figure 2b) allow to conclude that the processing does not induce any modification of the polymer, and all samples show the characteristic absorption bands of PHBV. Thus, bands at 820−980 and 1220−1460 cm −1 are observed, characterizing aliphatic C−H vibrational modes; at 1055, 1129, and 1180 cm −1 , related to C−O vibrations, and at 1720 cm −1 , characteristic of C�O stretching.…”

Section: Chemical Thermal and Wettability Characteristicsmentioning

confidence: 90%

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Piezoelectric and Magnetically Responsive Biodegradable Composites with Tailored Porous Morphology for Biotechnological Applications

Marques‐Almeida

Correia

Martín

et al. 2022

ACS Appl. Polym. Mater.

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The biomedical area in the scope of tissue regeneration pursues the development of advanced materials that can target biomimetic approaches and, ideally, have an active role in the environment they are placed in. This active role can be related to or driven by morphological, mechanical, electrical, or magnetic stimuli, among others. This work reports on the development of active biomaterials based on poly(3-hydroxybutyric acid-co-3-hydroxyvaleric acid), PHBV, a piezoelectric and biodegradable polymer, for tissue regeneration application by tailoring its morphology and functional response. PHBV films with different porosities were obtained using the solvent casting method, resorting to high-boiling-point solvents, as N,N-dimethylformamide (DMF) and dimethylsulfoxide (DMSO), and the combination of chloroform (CF) and DMF for polymer dissolution. Furthermore, magnetoelectric biomaterials were obtained through the combination of the piezoelectric PHBV with magnetostrictive iron oxide (Fe 3 O 4 ) nanoparticles. Independently of the morphology or filler content, all biomaterials proved to be suitable for biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Chemical Thermal and Wettability Characteristicsmentioning

confidence: 90%

See 1 more Smart Citation

Piezoelectric and Magnetically Responsive Biodegradable Composites with Tailored Porous Morphology for Biotechnological Applications

Marques‐Almeida

Correia

Martín

et al. 2022

ACS Appl. Polym. Mater.

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“…The spacecraft consists of several systems operated through mechanisms which needs lubrication. Solar array drives, momentum, reaction, filter wheels, tracking antennas, slip-ring assemblies, scanning devices, sensors, rover wheels, robotic arms, antenna arrays, gearboxes, bearings and actuators are few components requiring lubrication [24][25][26][27] (Taboada et al 2022, Liu et al 2022). In a case study, reported by the Colas et al [28], Cubsat satellite struck during the preflight testing and damaged due to freeting wear, grease containing PTFE was applied to its surface and eventually satellite was successfully launched.…”

Section: Application Of Space Tribologymentioning

confidence: 99%

The state of art on lubrication methods in space environment

Nautiyal,

Singh,

Gautam

et al. 2024

Phys. Scr.

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Space tribology is a very big aspect of space exploration, despite of this fact, there is a dearth of coherent and concise literature available in the field of space tribology. It becomes difficult to understand the tribological behaviour of mating bodies under the extreme environmental circumstances in space due to their potential chemical and physical interactions. The radiation, vacuum, environmental conditions and temperature, are the factors which affects the friction and wear behaviour of mating surfaces and may alter the chemical structure of solid or liquid lubricant. The combination of tribo-physical and tribo-chemical interactions makes the tribological analysis very difficult to understand. The lack of understanding and ignorance might be the reason for not addressing this issue in the past. This review contains the qualitative and quantitative information on the tribological behaviour of different types of liquid lubricants, greases, soft and hard coatings, combined lubrication systems, testing equipment, composites, solid lubricants and alloys developed for space applications.

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“…The wetting properties of surfaces are crucial for a wide range of applications, e.g., for filtering − and corrosion. , Lubrication and tribology are also greatly influenced by the wetting behavior, − which can lead to anisotropic spreading of lubricants in combination with surface roughness. − Recently, the development of surfaces with certain wetting characteristics has also gained attention for the design of antimicrobial surfaces. − Especially, topography modification by laser treatment is widely applied to tune the contact angle of technical surfaces. − Achieved wetting states range from hydrophilic with a static contact angle (SCA) smaller than 90° to hydrophobic (SCA > 90°) or even superhydrophobic (SCA > 150°, small contact angle hysteresis) . Also, the freezing behavior and the production of anti-icing surfaces pose a challenge that researchers have focused on. , This proves that a wide range of application-oriented studies has been conducted to successfully implement a certain wetting behavior on surfaces needed for the respective use.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Adventitious Carbon Groups on the Wetting of Copper: A Study on the Effect of Microstructure on the Static Contact Angle

Lößlein,

Merz,

Müller

et al. 2023

Langmuir

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Tuning of the wetting behavior of metallic surfaces by chemical and topographical modification has become popular in recent years. Still, there is a lack in the understanding of fundamental relations between intrinsic properties of the material and its resulting water contact angle. It is widely accepted in the literature that transitions from a hydrophilic to increasingly hydrophobic behavior upon exposure to ambient conditions happen due to the adsorption of adventitious hydrocarbons. In order to investigate the role of metallic bulk microstructure in the wetting behavior and its transition properties, we created three different grain sizes and deformation states on copper by preparation combined with heat treatment. We found that for freshly prepared surfaces, differences in the wetting behavior show a higher static contact angle for mechanically prepared surfaces with a fine-crystalline deformation layer compared to the electropolished cold-rolled copper sheet and the annealed defect-free coarse-grained surface. Already after five days of storage time, most of this difference vanishes, and all surfaces show a wetting behavior with a contact angle in the range of 97–100° after 30 days. Though long-term wetting behavior seems largely independent of microstructure, correlated XPS measurements showed an increased adsorption of organic contaminants of the mechanically polished surface. Preparation-induced near-surface defects seem to accelerate adsorption, while varying grain size and slight bulk deformation from rolling processes did not show significant effects. Complex relations between the amount of adsorbed carbon and the polarity of the adsorption film were found to depend on the sample age and influence the contact angle.

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Tribological performance of porous silicon hydrophobic and hydrophilic surfaces

Cited by 5 publications

References 37 publications

Piezoelectric and Magnetically Responsive Biodegradable Composites with Tailored Porous Morphology for Biotechnological Applications

Piezoelectric and Magnetically Responsive Biodegradable Composites with Tailored Porous Morphology for Biotechnological Applications

The state of art on lubrication methods in space environment

The Influence of Adventitious Carbon Groups on the Wetting of Copper: A Study on the Effect of Microstructure on the Static Contact Angle

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