Influence of surface morphology and roughness on water wetting properties of low temperature nitrided austenitic stainless steels

Borgioli, Francesca; Galvanetto, Emanuele; Bacci, T.

doi:10.1016/j.matchar.2014.07.006

Cited by 35 publications

(54 citation statements)

References 38 publications

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“…According to researches, the wetting property and wetting process are closely related to the surface morphology, and the surface roughness is considered as a significant reason.…”

Section: Model and Mechanismmentioning

confidence: 99%

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Jiaqiang

Deng

et al. 2017

Adv Materials Inter

109

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decades, researchers have shown great interests in bionics, which was a new multidisciplinary subject inspired by biological characteristics and features to imitate it to build technology devices. [1] With the rise of biomimetic biomaterial researches, a lot of attention was paid on the observation of living organism, especially on plant leaves, such as lotus, rice, taro leaves, etc. [2] As the development of scanning electron microscope (SEM), a wealth of data dealing with SEM of plant surface has been published since 1960s. [3] The cuticular structure was investigated with regard to function, and substances that were secreted onto the cuticle had great effects on the surface properties, while intracuticular waxes were the main barrier to wettability. [4] Some kinds of special wettability like superhydrophobicity and superhydrophilicity were also found in other surfaces, such as self-cleaning lotus leaf, [5] hydrophilicity of red rose petals, [6,7] the anisotropic dewetting behavior on rice leaf, [8,9] hydrophobicity of shark skin, [10] gecko toe, [11] insect wings, [12] etc., and striking superhydrophobic force provided by a water strider's legs, [13] and they were all related to the unique microstructures on their surface. In fact, the special wettability of surfaces is attributed to the interaction of both the surface microstructures and surface covers. As the development and progress of the observation device, smaller nanosized structures were found on the microstructure, and better properties of multiscale hierarchical structure was shown then. [14] Wetting is a phenomenon that solid interface was transferred from solid-gas interface to solid-liquid interface, wettability was a kind of ability that a liquid could be unfolded on one solid surface. The wettability of surface could be characterized by contact angle (CA) of interface. Sliding angle (SA) and contact angle hysteresis were introduced to evaluate the highly valued superhydrophobicity and superhydrophilicity of surfaces. Superhydrophilicity was defied as that of CA was smaller than 5°, superhydrophobicity was defied as that of CA was greater than 150°, as well as a really small sliding angle. It is worth noting that many researchers applied themselves to excavate the theories under the phenomena. Young's equation, Wenzel equation, and Cassie-Baxter equation [15,16] were the representations of hundreds years of research results. Improving and developing Surfaces of plants and animals are evolved to optimal states to accommodate environments better after billions of years of natural selection. As the development of further study on bionics, surfaces with special wetting properties in nature are discovered, extremely related to the micro-/nanostructures on surface. The wetting models and wetting mechanism of several surfaces in nature are investigated, followed by lifting the veil of superhydrophobic field. Various facile, effective, and convenient methods for fabricating superhydrophobic surfaces are obtained and optimized in scientific research and ...

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“…According to researches, the wetting property and wetting process are closely related to the surface morphology, and the surface roughness is considered as a significant reason.…”

Section: Model and Mechanismmentioning

confidence: 99%

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Jiaqiang

Deng

et al. 2017

Adv Materials Inter

109

View full text Add to dashboard Cite

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“…[42][43] Secondly, the increased surface nano-roughness can further reduce the wettability due to formation of air pockets between the nano-ridges. [44][45] In addition, the surface stiffness has been suggested to be more relevant to cell-substrate interactions compared to bulk elastic modulus of the substrate material. 46 Therefore, we used AFM indentation method to measure the compressive modulus of the treated PDMS surface.…”

Section: Resultsmentioning

confidence: 99%

Microfluidic Assay To Study the Combinatorial Impact of Substrate Properties on Mesenchymal Stem Cell Migration

Menon

Chuah

Phey

et al. 2015

ACS Appl. Mater. Interfaces

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As an alternative to complex and costly in vivo models, microfluidic in vitro models are being widely used to study various physiological phenomena. It is of particular interest to study cell migration in a controlled microenvironment because of its vital role in a large number of physiological processes, such as wound healing, disease progression, and tissue regeneration. Cell migration has been shown to be affected by variations in the biochemical and physical properties of the extracellular matrix (ECM). To study the combinatorial impact of the ECM physical properties on cell migration, we have developed a microfluidic assay to induce migration of human bone marrow derived mesenchymal stem cells (hBMSCs) on polydimethylsiloxane (PDMS) substrates with varying combinatorial properties (hydrophobicity, stiffness, and roughness). The results show that although the initial cell adhesion and viability appear similar on all PDMS samples, the cell spreading and migration are enhanced on PDMS samples exhibiting intermediate levels of hydrophobicity, stiffness, and roughness. This study suggests that there is a particular range of substrate properties for optimal cell spreading and migration. The influence of substrate properties on hBMSC migration can help understand the physical cues that affect cell migration, which may facilitate the development of optimized engineered scaffolds with desired properties for tissue regeneration applications.

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“…The calculated angles indicate that there was a surface change in the AISI 1045 steel due to the thermochemical interaction with the plasma. The contact angles [1] present a decreasing behavior after treatment with plasma, indicating a more hydrophobic behavior on the surfaces of treated steels. It can be explained by the change in the surface of the steel produced by the treatment that the formation of the second-phase precipitates (γ and ε) produces physical and chemical changes on the surface, which were confirmed by X-ray diffraction.…”

Section: Water Contact Angle Measurementsmentioning

confidence: 95%

“…In recent years, the interactions between a solid surface and a liquid have been investigated. Those interactions were investigated by measuring the contact angle between them, which indicates the degree of wettability in the interaction of the solid and the liquid [1]. Knowing the mechanism that prevails in this type of interaction between a flat and a liquid-solid phase is important in certain operations in specific industrial applications, such as lubrication of machine elements and liquid coatings.…”

Section: Introductionmentioning

confidence: 99%

“…In order to determine the appropriate application for nitrided steel knowing its contact angle, it is necessary to determine what type of angle is formed: an angle greater than 90° indicates a hydrophobic interface, whereas an angle less than 90° indicates a hydrophilic interface. The behavior of wettability in solids depends mainly on the chemical composition, physical characteristics, interactions between the molecules present in the two substances, and the roughness of the surface [1,9,13].…”

Section: Introductionmentioning

confidence: 99%

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Implementation of a Low Cost For Internal Dosimetry Radiological Survey of Ionization Radiation Exposed Workers In Nuclear Medicine Services

Valle

Angeles

Garcia

2017

JNP

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In the present work, we analyzed the effect of the plasma treatment of 80% H 2 /20% N 2 mixture plasma over the AISI 1045 steel. To produce the plasma, an AC discharge of 0.1 A at 350 V was produced at a total pressure of 3.0 Torr. The mixture plasma was analyzed using optical emission spectroscopy (OES), in the wavelength range of 200 to 1100 nm. The principal species observed in the plasma were NH, N 2 , N 2 + , H 2 , and Hα. The electron temperature and ion density have been measured using a double Langmuir probe. The samples of steel were treated by plasma at different discharge times, between 3 and 12 h, at the same pressure and AC parameters (0.1 A and 350 V). The treated samples were characterized using X-ray analysis, finding the phases gamma and epsilon of iron nitride. The thickness of the nitrided layers was measured using a scanning electron microscope (SEM). From the images obtained, it is possible to appreciate the interphase between the nitrided layer and the steel matrix. The relationship between the morphology of the surface of nitrided steel and the wetting was analyzed by measuring the contact angle between the surface and a drop of 5 µL of distilled water. The contact angle of the drop increased with the increase of plasma treatment time. The control sample without treatment presented a smaller angle, and after the treatment the surfaces of the steel became hydrophobic. This may be related to the morphology change of the steel surface produced by plasma treatment.

show abstract

Influence of surface morphology and roughness on water wetting properties of low temperature nitrided austenitic stainless steels

Cited by 35 publications

References 38 publications

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Wetting Models and Working Mechanisms of Typical Surfaces Existing in Nature and Their Application on Superhydrophobic Surfaces: A Review

Microfluidic Assay To Study the Combinatorial Impact of Substrate Properties on Mesenchymal Stem Cell Migration

Implementation of a Low Cost For Internal Dosimetry Radiological Survey of Ionization Radiation Exposed Workers In Nuclear Medicine Services

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