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Search: swepub > Other academic/artistic > Umeå University > RISE

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  • Idström, Alexander, et al. (author)
  • Dissolution of cellulose in tetrabutylammonium acetate/dimethyl sulfoxide
  • 2016
  • In: The 7th workshop on cellulose, regenerated cellulose and cellulose derivatives.
  • Conference paper (other academic/artistic)abstract
    • The dissolution of cellulose in tetrabutylammonium acetate (TBAAc)/dimethyl sulfoxide (DMSO) was studied combining experimental and simulation techniques. It was found that the dissolution limit at 40 °C corresponded to a molar ratio close to one acetate per cellulose anhydroglucose units. MD simulations suggested that the acetate ions bind to cellulose by dual hydrogen bonds. This effectively turns cellulose into a polyelectrolyte, attracting the bulky tetrabutylammonium (TBA+) counter ions, which prevent close contact between chains in the dissolved state. This hypothesis was tested by 1H- and 13C-NMR spectroscopy, which confirmed that acetate forms hydrogen bonds to cellulose, and by diffusion NMR spectroscopy, which demonstrated a strong dynamic correlation between bound acetate and tetrabutylammonium in near-quantitative agreement with simulation. The present results suggest that offering hydrogen bonding to the acetate ions is the main driving force for dissolving cellulose and that the TBA+ counter ions form a diffuse layer around the acetate-decorated cellulose chains.
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  • Peeters, Jeroen, 1986-, et al. (author)
  • Designing Expressions of Movement Qualities
  • 2018
  • In: Proceedings of the 2018 Designing Interactive Systems Conference. - New York, NY, USA : ACM. - 9781450351980 ; , s. 679-690
  • Conference paper (other academic/artistic)abstract
    • Tango is a form of partner dancing in which two bodies sense one another, and move accordingly, in a dynamic, physical dialogue that is known for its subtle complexities, beauty and intimate experience. In MoCap Tango, we explore how we can build on our skills as designers to highlight and unravel these embedded qualities and use them as inspiration in designing interactions. In this pictorial, we invite the reader to actively participate in the designerly engagement that turns objective data into subjective expressions; highlighting the qualities embedded in the movements of professional dancers.
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  • Result 1-6 of 6

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