Experiments on the contact angle of n-propanol on differently prepared silver substrates at various temperatures and implications for the properties of silver nanoparticles

Pinterich, Tamara; Winkler, Paul M.; Vrtala, Aron; Wagner, Paul

doi:10.1016/j.atmosres.2010.10.005

Cited by 6 publications

(3 citation statements)

References 52 publications

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“…Depending on the contact angle observed, the surface can be classified as super‐hydrophobic (θ > 150°), hydrophobic (65°<θ < 150°), hydrophilic (0°<θ < 65°) and super‐hydrophilic (θ ± 0°) . Previous studies have investigated the temperature‐dependence of contact angle measurements on metallic surfaces, and it is known that contact angles decrease with increasing temperature and with surface nanostructural changes causing an increase of contact angle with increasing temperature . Moreover, this study determined surface energy after adding bacteria to the substrates and found that, after 1 and 2 days of bacteria exposure, the TiO 2 structures were hydrophilic because of their nanotubular and nanofeatured surfaces.…”

Section: Discussionmentioning

confidence: 87%

Reducing Staphylococcus aureus growth on Ti alloy nanostructured surfaces through the addition of Sn

Verissimo

Geilich

Oliveira

et al. 2015

J Biomedical Materials Res

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β-type Ti alloys containing Nb are exciting materials for numerous orthopedic and dental applications due to their exceptional mechanical properties. To improve their cytocompatibility properties (such as increasing bone growth and decreasing infection), the surfaces of such materials can be optimized by adding elements and/or nanotexturing through anodization. Because of the increasing prevalence of orthopedic implant infections, the objective of this in vitro study was to add Sn and create unique nanoscale surface features on β-type Ti alloys. Nanotubes and nanofeatures on Ti-35Nb and Ti-35Nb-4Sn alloys were created by anodization in a HF-based electrolyte and then heat treated in a furnace to promote amorphous structures and phases such as anatase, a mixture of anatase-rutile, and rutile. Samples were characterized by SEM, which indicated different morphologies dependent on the oxide content and method of modification. XPS experiments identified the oxide content which resulted in a phase transformation in the oxide layer formed onto Ti-35Nb and Ti-35Nb-4Sn alloys. Most importantly, regardless of the resulting nanostructures (nanotubes or nanofeatures) and crystalline phase, this study showed for the first time that adding Sn to β-type Ti alloys strongly decreased the adhesion of Staphylococcus aureus (S. aureus; a bacteria which commonly infects orthopedic implants leading to their failure). Thus, this study demonstrated that β-type Ti alloys with Nb and Sn have great promise to improve numerous orthopedic applications where infection may be a concern.

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Section: Discussionmentioning

confidence: 87%

Reducing Staphylococcus aureus growth on Ti alloy nanostructured surfaces through the addition of Sn

Verissimo

Geilich

Oliveira

et al. 2015

J Biomedical Materials Res

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“…Another new area of experimental investigations is the wetting of single nanoparticles. Nanoparticles responsible for aerosol formation, for instance, are studied to better understand heterogeneous nucleation at the basis of cloud formation which eventually regulate the global climate . Nanoparticles at fluid interphases such as those used in pharmaceutical emulsions, paints, flotation or oil recovery are also the object of investigations.…”

Section: Element Of Responsementioning

confidence: 99%

Questions and Answers on the Wettability of Nano‐Engineered Surfaces

MacGregor

Vasilev

2017

Adv Materials Inter

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Surface roughening has long been used to confer materials remarkable wetting properties, such as super hydrophobicity. When roughness belongs to the microscale, existing models can, to some extent, explain and predict real‐world wetting states. With the advent of nanotechnology, however, a multitude of nano‐engineered materials are being developed and unexpected wetting behaviors have been observed which cannot be described by conventional theories. While it is clear that advanced nanotextured materials are essential to a vast range of ground breaking technologies, the intricate mechanisms governing the wetting of such surfaces—at the limit of validity of continuum theories—also need to be clarified. This review aims at presenting what is known and what remains to be discovered about the wettability of nanoengineered materials. The advantages and uniqueness of nanostructured substrates is highlighted first, with a focus on practical applications benefitting from the distinctive wetting properties of nanorough substrates. Classic wetting theories and their limitations are briefly discussed, before describing with a top down vision, why the wetting of nanostructured substrates differ from that of microtextured surfaces. Recent experimental and theoretical studies which contributed to the progress in this field are considered, before outlining potential future areas of research.

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“…Young 6 has found that this interaction can be characterized by a well-defined (macroscopic) contact angle between solid and liquid surfaces in the vicinity of the three-phase contact line. Contact angles in the macroscopic scale have been measured for various compounds using the telescope goniometer method 7 8 , the Wilhelmy balance method 9 10 , the capillary tube method 4 and a few other techniques. In the intermediate micron size range contact angles have been measured using atomic force microscopy (e.g.…”

mentioning

confidence: 99%

Direct determination of three-phase contact line properties on nearly molecular scale

Winkler

McGraw

Bauer

et al. 2016

Sci Rep

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Wetting phenomena in multi-phase systems govern the shape of the contact line which separates the different phases. For liquids in contact with solid surfaces wetting is typically described in terms of contact angle. While in macroscopic systems the contact angle can be determined experimentally, on the molecular scale contact angles are hardly accessible. Here we report the first direct experimental determination of contact angles as well as contact line curvature on a scale of the order of 1nm. For water nucleating heterogeneously on Ag nanoparticles we find contact angles around 15 degrees compared to 90 degrees for the corresponding macroscopically measured equilibrium angle. The obtained microscopic contact angles can be attributed to negative line tension in the order of −10−10 J/m that becomes increasingly dominant with increasing curvature of the contact line. These results enable a consistent theoretical description of heterogeneous nucleation and provide firm insight to the wetting of nanosized objects.

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Experiments on the contact angle of n-propanol on differently prepared silver substrates at various temperatures and implications for the properties of silver nanoparticles

Cited by 6 publications

References 52 publications

Reducing Staphylococcus aureus growth on Ti alloy nanostructured surfaces through the addition of Sn

Reducing Staphylococcus aureus growth on Ti alloy nanostructured surfaces through the addition of Sn

Questions and Answers on the Wettability of Nano‐Engineered Surfaces

Direct determination of three-phase contact line properties on nearly molecular scale

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