Exjobbsförslag från företag

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Förslaget inkom 2003-09-12

Engineering of patterned surfaces with new inkjet techniques

OBS! ANSÖKNINGSTIDEN FÖR DETTA EXJOBB HAR LÖPT UT.
This Master's thesis project (exjobb) is to be carried out within YKI's Forest Products Section. YKI, Ytkemiska Institutet AB (Institute for Surface Chemistry) is an internationally leading research centre in applied surface and colloid chemistry. Knowledge about surface chemical phenomena e,g, cleaning, adhesion and surface modification is of importance for process and product development in different areas. YKI therefore works with most industrial sectors including chemical producers, engineering industries, forest products, plastics, paint, packaging, pharmaceutical, biotechnology and food industries. Our industrial partners range from multinational companies to domestic small and medium-sized enterprises (SMEs). YKI has 80 member companies worldwide. YKI is located in a research-intensive area on the campus of the technical university (KTH) in Stockholm, close to Stockholm University and the medical university Karolinska Institutet. See www.surfchem.kth.se for further information.

Over the past 30 years, the inkjet technique for direct digital printing has undergone enormous developments in printer hardware and software design, ink formulations and substrate compatibility, resulting in a dramatic increase in its popularity for home, office and commercial printing of paper and board, and extensions to other printing markets such as metals, plastics and clothing. The versatility of this technique suggests a variety of further applications, such as array printing of biochemical assays and 2- or 3-D construction of patterned ceramic materials, which are presently the focus of intense research and development. The unconventional ¿inks¿ in these novel applications, e.g. dilute solutions of biomolecules or concentrated inorganic slurries, are incompatible with the familiar and cheap commercial printer hardware. The in-house engineering of a new breed of inkjet printer, and its subsequent use within such new fields of targeting or patterning, is the subject of this Master's thesis project.

In particular, this project will focus on the inkjet printing of high-solids dispersions of particles and binder, owing to its relevance to a variety of applications. This includes both the construction of novel structured ceramics mentioned above and the analysis of single-drop events in industrial spray coating processes. The engineering task entails choosing appropriate continuous-head hardware to ensure sufficiently fine and reproducible drops and programming its drive routine to control the drop size and steer the print pattern. Other add-ons, such as a print dryer and dynamic analysis tools, could be integrated into this basic design if time permits. The second stage of the project then uses the ink-jet equipment to analyse the correlations between the input dispersion properties, through to the drop impact, spreading, merging and immobilisation behaviour, and on to the output print quality, i.e. structural and functional properties of the printed layer(s). This second stage will involve use of a range of advanced tools for surface characterisation, e.g. AFM, ESEM and ESCA.

Praktisk information
Start: snarast enligt överenskommelse. Lämplig bakgrund för dig som söker är kemi/kemiteknik eller motsvarande.

Intresserad? Kontakta snarast:
Dr Andrew Fogden, YKI, tel. 08-790 99 49 / andrew.fogden@surfchem.kth.se

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