The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Nicholas D. Spencer - One of the best experts on this subject based on the ideXlab platform.
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Orthogonal, three-component, alkanethiol-based Surface-Chemical gradients on gold.
Langmuir : the ACS journal of surfaces and colloids, 2010Co-Authors: Eva Beurer, Nagaiyanallur V. Venkataraman, Antonella Rossi, Florian Bachmann, Roman Engeli, Nicholas D. SpencerAbstract:An orthogonal Surface-Chemical gradient composed of self-assembled monolayers on gold has been prepared by successive, controlled immersions in orthogonal directions into dilute solutions of dodecanethiol and perfluorododecanethiol. The resulting two-component orthogonal gradient in Surface coverage was backfilled with 11-mercaptoundecanol, leading to a two-directional, three-component Surface-Chemical gradient. Water and hexadecane show distinctly different wetting behaviors on the gradient Surface because of the differences in the hydrophobic and oleophobic natures of the three different constituents. These results are correlated with the Chemical composition maps of the Surface obtained by X-ray photoelectron spectroscopy. The homogeneity and the ordering of the self-assembled monolayer were investigated by dynamic water contact angle measurements and polarization-modulation infrared reflection−absorption spectroscopy.
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Surface Chemical and morphological gradients
Soft Matter, 2008Co-Authors: Sara Maria Morgenthaler, Christian Zink, Nicholas D. SpencerAbstract:Surface gradients of chemistry or morphology represent powerful tools for the high-throughput investigation of interfacial phenomena in the areas of physics, chemistry, materials science and biology. A wide variety of methods for the fabrication of such gradients has been developed in recent years, relying on principles ranging from diffusion to time-dependent irradiation in order to achieve a gradual change of a particular parameter across a Surface. In this review we have endeavoured to cover the principal fabrication approaches for Surface-Chemical and Surface-morphological gradients that have been described in the literature, and to provide examples of their applications in a variety of different fields.
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Fabrication of Multiscale Surface-Chemical Gradients by Means of Photocatalytic Lithography
Langmuir : the ACS journal of surfaces and colloids, 2007Co-Authors: Nicolas Blondiaux, Stefan Zurcher, Martha Liley, Nicholas D. SpencerAbstract:We describe a new method for the fabrication of Surface-Chemical gradients. A film of titanium dioxide is brought into close proximity to a uniformly monolayer-covered Surface and exposed to UV lig...
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a simple reproducible approach to the preparation of Surface Chemical gradients
Langmuir, 2003Co-Authors: Sara Maria Morgenthaler, Stefan Zurcher, Nicholas D. SpencerAbstract:We demonstrate a very simple and reproducible preparative approach for the fabrication of Surface-Chemical gradients. A Surface concentration gradient of adsorbed methyl- or hydroxyl-terminated thi...
Magnus Wålinder - One of the best experts on this subject based on the ideXlab platform.
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Water vapour sorption properties and Surface Chemical analysis of thermally modified wood particles
2014Co-Authors: Susanna Källbom, Magnus Wålinder, Lauri Rautkari, Dennis Jones, Kristoffer SegerholmAbstract:Water vapour sorption properties and Surface Chemical analysis of thermally modified wood particles
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Spectroscopic studies of Surface Chemical composition and wettability of modified wood
Wood Material Science and Engineering, 2009Co-Authors: Finn Englund, Lars Elof Bryne, Marie Ernstsson, Jukka Lausmaa, Magnus WålinderAbstract:Abstract Recent advances in spectroscopic methods used in the Surface science field may provide new valuable information about the Surface Chemical composition of engineering materials. Such methods, combined with wettability analyses, have been applied in the development of well-designed adhesives and coating systems for newly developed and commercially available modified wood materials. The main objective of this paper is to demonstrate and present some aspects on the application of two different state-of-the-art spectroscopic methods for Surface Chemical composition studies of a complex material such as modified wood. The methods are X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS), the former generating more quantitative data and the latter more qualitative data. The spectroscopic data are also combined with wettability data obtained from contact angle measurements using the Wilhelmy method. Modified wood samples were prepared from pilot plant or com...
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Some Aspects on the Determination of Surface Chemical Composition and Wettability of Modified Wood
Wood Material Science and Engineering, 2009Co-Authors: Finn Englund, Lars Elof Bryne, Marie Ernstsson, Jukka Lausmaa, Magnus WålinderAbstract:Some Aspects on the Determination of Surface Chemical Composition and Wettability of Modified Wood
Finn Englund - One of the best experts on this subject based on the ideXlab platform.
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Spectroscopic studies of Surface Chemical composition and wettability of modified wood
Wood Material Science and Engineering, 2009Co-Authors: Finn Englund, Lars Elof Bryne, Marie Ernstsson, Jukka Lausmaa, Magnus WålinderAbstract:Abstract Recent advances in spectroscopic methods used in the Surface science field may provide new valuable information about the Surface Chemical composition of engineering materials. Such methods, combined with wettability analyses, have been applied in the development of well-designed adhesives and coating systems for newly developed and commercially available modified wood materials. The main objective of this paper is to demonstrate and present some aspects on the application of two different state-of-the-art spectroscopic methods for Surface Chemical composition studies of a complex material such as modified wood. The methods are X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (ToF-SIMS), the former generating more quantitative data and the latter more qualitative data. The spectroscopic data are also combined with wettability data obtained from contact angle measurements using the Wilhelmy method. Modified wood samples were prepared from pilot plant or com...
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Some Aspects on the Determination of Surface Chemical Composition and Wettability of Modified Wood
Wood Material Science and Engineering, 2009Co-Authors: Finn Englund, Lars Elof Bryne, Marie Ernstsson, Jukka Lausmaa, Magnus WålinderAbstract:Some Aspects on the Determination of Surface Chemical Composition and Wettability of Modified Wood
L. B. Freund - One of the best experts on this subject based on the ideXlab platform.
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A Surface Chemical potential for elastic solids
Journal of The Mechanics and Physics of Solids, 1998Co-Authors: L. B. FreundAbstract:Abstract The Surface Chemical potential field represents the tendency for an elastic solid to lower its free energy by means of mass rearrangement. In a recent paper in this Journal, Wu, 1996 [ J. Mech. Phys. Solids 44, 2059–2077] pointed out that the commonly used definition of Chemical potential for elastic solids is inconsistent with the change in free energy of the system associated with shape change at finite strain. The purpose here is to rederive Wus main result by a direct rate calculation, rather than a variational approach, which appears to be simpler in implementation. In addition, the definition is generalized to include orientation dependence of Surface energy.
Sara Maria Morgenthaler - One of the best experts on this subject based on the ideXlab platform.
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Surface Chemical and morphological gradients
Soft Matter, 2008Co-Authors: Sara Maria Morgenthaler, Christian Zink, Nicholas D. SpencerAbstract:Surface gradients of chemistry or morphology represent powerful tools for the high-throughput investigation of interfacial phenomena in the areas of physics, chemistry, materials science and biology. A wide variety of methods for the fabrication of such gradients has been developed in recent years, relying on principles ranging from diffusion to time-dependent irradiation in order to achieve a gradual change of a particular parameter across a Surface. In this review we have endeavoured to cover the principal fabrication approaches for Surface-Chemical and Surface-morphological gradients that have been described in the literature, and to provide examples of their applications in a variety of different fields.
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a simple reproducible approach to the preparation of Surface Chemical gradients
Langmuir, 2003Co-Authors: Sara Maria Morgenthaler, Stefan Zurcher, Nicholas D. SpencerAbstract:We demonstrate a very simple and reproducible preparative approach for the fabrication of Surface-Chemical gradients. A Surface concentration gradient of adsorbed methyl- or hydroxyl-terminated thi...
