Daniel Duffy
University of Cambridge
6 Papers
13 Citations
Daniel Duffy is an academic researcher from University of Cambridge. The author has contributed to research in topics: Gaussian curvature & Curvature. The author has an hindex of 3, co-authored 6 publications.
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Papers
Shape programming lines of concentrated Gaussian curvature
Daniel Duffy,L. Cmok,John S. Biggins,A. Krishna,Carl D. Modes,Mustafa K. Abdelrahman,Mahjabeen Javed,Taylor H. Ware,Fan Feng,Mark Warner +9 more
TL;DR: In this paper, a spatially patterned director within a flat liquid crystal elastomers (LCE) sheet was constructed from regions of radial and circular director, which, in isolation, would form cones and anticones.
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Shape programming lines of concentrated Gaussian curvature
Daniel Duffy,L. Cmok,John S. Biggins,A. Krishna,Carl D. Modes,Mustafa K. Abdelrahman,Mahjabeen Javed,Taylor H. Ware,Fan Feng,Mark Warner +9 more
TL;DR: In this paper, a spatially patterned director within a flat liquid crystal elastomers (LCE) sheet is constructed from regions of radial and circular director, which, in isolation, would form cones and anticones.
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Defective nematogenesis: Gauss curvature in programmable shape-responsive sheets with topological defects
Daniel Duffy,John S. Biggins +1 more
TL;DR: In this paper, the Gauss-Bonnet theorem is used to deduce the structural curvature encoded in a pattern of uniform-magnitude contraction/elongation with spatially varying direction, as is commonly implemented in patterned liquid crystal elastomers.
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Concentrated Gaussian curvature in curved creases of actuated spiral nematic solids
TL;DR: In this paper, the authors characterize all possible metric-compatible interfaces between two spiral patterns, specifically where the same metric change occurs on each side, and they are classified as hyperbolic type, elliptic-type, concentric spiral, and continuous-director interfaces.
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Metric mechanics with non-trivial topology: actuating irises, cylinders and evertors
Daniel Duffy,Mahjabeen Javed,Mustafa K. Abdelrahman,Taylor H. Ware,Mark Warner,John S. Biggins +5 more
TL;DR: In this article, the authors systematically catalogue the set of developable surfaces encodable via axisymmetric director patterns, and uncover several qualitatively new modes of actuation, including cylinders, irises, and everted surfaces in which the inner boundary becomes the outer boundary after actuation.