Contact Angle Measurements and Contact Angle Interpretation. 1. Contact Angle Measurements by Axisymmetric Drop Shape Analysis and a Goniometer Sessile Drop Technique

Kwok, Daniel Y.; Gietzelt, Thomas; Grundke, Karina; Jacobasch, H.‐J.; Neumann, A. W.

doi:10.1021/la9608021

Cited by 254 publications

(182 citation statements)

References 22 publications

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“…The measurements were carried out using a 5-ml ultrapure water droplet at room temperature with a standard procedure. 31 Measurements were repeated three times at different positions on the same sample surfaces. Acquired images for droplets were analyzed using software (ImageJ; NIH) with an LBADSA plugin.…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

Gold Nanoparticle Monolayer Formation on a Chemically Modified Glass Surface

2009

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Physicochemical analyses of Au nanoparticle monolayer formation on a glass surface functionalized with 3-aminopropyltrimethoxysilane (APTMS) and ethyltrimethoxysilane (ETMS) were performed for fabricating a nanoarchitecture of metal nanoparticles using self-assembly. The Au nanoparticle surface density on the functionalized glass surface correlated linearly with the optical response because of Au-nanoparticle localized surface plasmon resonance (LSPR). This relation enabled assessment of the Au nanoparticle deposition. A Frumkin isotherm showed the deposition of Au nanoparticles on the APTMS or APTMS/ETMS functionalized glass surface. For an APTMS-derivatized surface, the affinity between the Au nanoparticles and the surface decreased with the lowering of the APTMS surface coverage. The interaction parameter exhibited attractive interaction of 30-nm-diameter Au nanoparticles; 12 nm particles were repulsive. Adsorption isotherm experiments using Au nanoparticles on glass surfaces with an APTMS and ETMS mixed layer suggest that hydrophobic interaction between Au nanoparticles' bare gold surfaces caused the attractive interaction among 30-nm-diameter nanoparticles.

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Section: Contact Angle Measurementsmentioning

confidence: 99%

Gold Nanoparticle Monolayer Formation on a Chemically Modified Glass Surface

2009

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“…13 This technique measures the level of hydrophobicity of a material surface based on the balance of interfacial free energies presented by a three-phase boundary system when the liquid comes in contact with a solid surface under ambient conditions. 14 Water CA measurements were recorded at three separate spatial locations in the central region of each sample using a Dataphysics™ OCA-20 goniometry system under room conditions.…”

Section: Contact Angle Measurementsmentioning

confidence: 99%

Can attenuated total internal reflection-Fourier transform infrared be used to understand the interaction between polymers and water? A hyperspectral imaging study

Mukherjee

Martínez-González

Stallard

et al. 2017

J. Spectral Imaging

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This study investigates the potential use of attenuated total internal reflection-Fourier transform infrared (ATR-FT- IR) imaging, a hyperspectral imaging modality, to investigate molecular level trends in the interaction of water with polymeric surfaces of varying hydrophobicity. The hydrophobicity of two categories of polymeric biomaterials is characterised using contact angle (CA) measurements and their relationship with the band area of the OH stretching νs vibration of water over time is presented. This is supported with correlations between CA data and single wavenumber intensity values (univariate analysis). Multivariate analysis of the spectra captured at the OH stretch for all polymers is carried out using principal component analysis to study the spatial variation in the interaction between the polymeric surfaces and water. Finally, a comparison between the univariate and multivariate strategies is presented to understand the interaction between polymeric biomaterials and water. This is a corrected version of the original paper; this corrected version was published on 15 May 2017. Please see Erratum at https://doi.org/10.1255/jsi.2017.a3e.

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“…However, this method suffers from some limitations, e. g. the diameter of the liquid drop affects the results [17] and the solid surface must be smooth [18,19]. The solids are frequently powders and it is impossible to prepare a flat and smooth surface [20].…”

Section: Surface Energy and Adhesionmentioning

confidence: 99%