Characterisation Platform For Surface Metrology

The measurement and characterisation of surface texture are the most critical factors and important functionality indicators.The real surfaces is continuous, but a discrete data set is acquired by any metrology instrumentation. After a series of processes of the finite digital sample, the parameters, which are the link betweenthe surface texture, the functionality excepted and the manufacturing process, will be calculated for the surface characterisation. This platform is designed to realize the analysis and processes for the surface characterisation

A finite element approach for vector- and tensor-valued surface PDEs

We derive a Cartesian componentwise description of the covariant derivative of tangential tensor fields of any degree on general manifolds. This allows to reformulate any vector- and tensor-valued surface PDE in a form suitable to be solved by established tools for scalar-valued surface PDEs. We consider piecewise linear Lagrange surface finite elements on triangulated surfaces and validate the approach by a vector- and a tensor-valued surface Helmholtz problem on an ellipsoid. We experimentally show optimal (linear) order of convergence for these problems. The full functionality is demonstrated by solving a surface Landau-de Gennes problem on the Stanford bunny. All tools required to apply this approach to other vector- and tensor-valued surface PDEs are provided

All-inorganic core-shell silica-titania mesoporous colloidal nanoparticles showing orthogonal functionality

Colloidal mesoporous silica (CMS) nanoparticles with a thin titania-enriched outer shell showing a spatially resolved functionality were synthesized by a delayed co-condensation approach. The titaniashell can serve as a selective nucleation site for the growth of nanocrystalline anatase clusters. These fully inorganic pure silica-core titania-enriched shell mesoporous nanoparticles show orthogonal functionality, demonstrated through the selective adsorption of a carboxylate-containing ruthenium N3-dye. UV-Vis and fluorescence spectroscopy indicate the strong interaction of the N3-dye with the titania-phase at the outer shell of the CMS nanoparticles. In particular, this interaction and thus the selective functionalization are greatly enhanced when anatase nanocrystallites are nucleated at the titania-enriched shell surface

Surface Polymer Network Model and Effective Membrane Curvature Elasticity

A microscopic model of a surface polymer network - membrane system is introduced, with contact polymer surface interactions that can be either repulsive or attractive and sliplinks of functionality four randomly distributed over the supporting membrane surface anchoring the polymers to it. For the supporting surface perturbed from a planar configuration and a small relative number of surface sliplinks, we investigate an expansion of the free energy in terms of the local curvatures of the surface and the surface density of sliplinks, obtained through the application of the Balian - Bloch - Duplantier multiple surface scattering method. As a result, the dependence of the curvature elastic modulus, the Gaussian modulus as well as of the spontaneous curvature of the "dressed" membrane, ~{\sl i.e.} polymer network plus membrane matrix, is obtained on the mean polymer bulk end to end separation and the surface density of sliplinks.Comment: 15 pages with one included compressed uuencoded figure

Modeling of multifunctional deformable porous scaffolds for soft tissue engineering

Porous membranes/scaffolds such as guided tissue regeneration (GTR) membranes, cell sheets, tissue matrices or polymeric meshes are being widely used in soft tissue engineering to regenerate damaged, diseased tissue or wound. These membranes are mostly regular porous structures with repeating internal architecture. When they are applied onto wound area, various forces caused by bandage, contraction and self weight might cause deformation. As a result, the geometry and the designed porosity changes which eventually alters the desired choreographed functionality. To avoid the negative effect cause by such deformation and its associated consequences, a novel design methodology has been proposed to determine and include the resultant deformation. The proposed design will minimize the variation in effective porosity while ensuring its surface conformity. Thus the proposed design will provide a better functionality by providing both structural integrity and proper biological properties. The proposed methodology has been implemented and results will be shown with illustrative examples. Also a comparison study showing effective porosity for both the proposed method and conventional regular porosity will be presented for a free-form surface mimicking a wound

Flexible shape extraction for micro/nano scale structured surfaces.

Surface feature is the one of the most important factors affecting the functionality and reliability of micro scale patterned surfaces. For micro scale patterned surface characterisation, it’s important to extract the surface feature effectively and accurately. The active contours, known as “snakes”, have been successfully used to segment, match and track the objects of interest. The active contours have been applied to facial boundary detection, medical image processing, motion correction, etc. In this paper, surface feature extraction techniques based on active contours have been investigated. Parametric active contour models and geometric active contour models have been presented. Also, a group of examples has been selected here to demonstrate the feasibility and applicability of the surface pattern extraction techniques based on active contours. At last, experimental results will be given and discussed