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Office Hours:听Wednesday 3:30 - 4:30 p.m.听or by appointment听鈥� 听鈥⑻�听鈥⑻�

Background:

Joseph Maclennan received his B.Sc.(Hons.) in Physics and Electronics from听Rhodes University, South Africa, in 1980, and his Ph.D. in Physics from the University of baby直播app in 1988. He then spent five years in the Physical Chemistry Department at the University of Mainz in Germany, the first two as a Humboldt Postdoctoral Fellow. In 1994 he returned to Boulder to rejoin the Liquid Crystal Physics group at the University of baby直播app. His research interests center on determining the structure and electro-optic properties of liquid crystal materials, including bent-core and ferroelectric smectics and ferromagnetic colloids, and on understanding the textures and phase transitions of freely-suspended liquid crystal films, including the interactions and ordering behavior of topological defects and islands and the 2D hydrodynamics of liquid droplets.

Selected Publications:

1. "First-principles experimental demonstration of ferroelectricity in a thermotropic nematic liquid crystal: Polar domains and striking electro-optics," X. Chen, E. Korblova, D. Dong, X. Wei, R. Shao, L. Radzihovsky, M. A. Glaser, J. E. Maclennan, D. Bedrov, D. M. Walba, and N. A. Clark, Proceedings of the National Academy of Sciences, 117 (25) 14021鈭�14031 (2020). DOI: 10.1073/pnas.2002290117
2. "Frustration between two- and three-dimensional smectic ordering leads to a biaxial nematic phase,"听 D. Chen, D. A. Coleman, C. Zhu, N. Chattham, F. Jenz, X. Cheng, C. Tschierske, M. A. Glaser, J. E. Maclennan, and N. A. Clark, Soft Matter 16 (3), 747鈭�753 (2019). DOI: 10.1039/C9SM01809C
3. "Chiral Incommensurate Helical Phase in a Smectic of Achiral Bent-Core Mesogens," A. A. S. Green, M. R. Tuchband, R. Shao, Y. Shen, R. Visvanathan, A. E. Duncan, A. Lehmann, C. Tschierske, E. D. Carlson, E. Guzman, M. Kolber, D. M. Walba, C. S. Park, M. A. Glaser, J. E. Maclennan, and N. A. Clark, Physical Review Letters 122 (10), 107801 (2019). DOI: 10.1103/PhysRevLett.122.107801
4. "Realization of hydrodynamic experiments on quasi-2D liquid crystal films in microgravity," N. A. Clark, A. Eremin, M. A. Glaser, N. Hall, K. Harth, C. Klopp, J. E. Maclennan, C. S. Park, R. Stannarius, P. Tin, W. N. Thurmes, T. Trittel, Advances in Space Research 60, 737-751 (2017). DOI: 10.1016/j.asr.2017.04.014
5. "Active microrheology of smectic membranes," Z. Qi, K. Ferguson, Y. Sechrest, T. Munsat, C. S. Park, M. A. Glaser, J. E. Maclennan, N. A. Clark, T. Kuriabova, and T. R. Powers, Physical Review E听 95 (1), 022702 (2017). DOI: 10.1103/PhysRevE.95.022702
6. "Diastereomeric liquid crystal domains at the mesoscale," D. Chen, M.听Tuchband, B. Horanyi, E. Korblova, D. M. Walba, M. A. Glaser, J. E.听Maclennan, and N. A. Clark, Nature Communications 6, 7763 (2015). DOI: 10.1038/ncomms8763
7. "Field alignment of bent-core smectic liquid crystals for analog optical phase modulation," Y. Shen, L. Goodhew, R. Shao, M. Moran, E. Korblova, D. Walba, N. A. Clark, J. E. Maclennan, and P. Rudquist, Applied Physics Letters 106 (19), 191101 (2015). DOI: 10.1063/1.4919805
8. "Mutual Diffusion of Inclusions in Freely Suspended Smectic Liquid Crystal Films," Z. Qi, Z. H. Nguyen, C. S. Park, M. A. Glaser, J. E. Maclennan, N. A. Clark, T. Kuriabova, and T. R. Powers, Physical Review Letters 113 (12), 128304 (2014). DOI: 10.1103/PhysRevLett.113.128304
9. "Chiral heliconical ground state of nanoscale pitch in a nematic liquid crystal of achiral molecular dimers," D. Chen, J. H. Porada, J. B. Hooper, A. Klittnick, Y. Shen, M. R. Tuchband, E. Korblova, D. Bedrov, D. M. Walba, M. A. Glaser, J. E. Maclennan, and N. A. Clark,听PNAS听110听(40), 15931鈥�15936 (2013). DOI:10.1073/pnas.1314654110
10. "Nanoconfinement of guest materials by helical nanofilament networks of bent-core mesogens,鈥� D. Chen, C. Zhu, H. Wang, J. E. Maclennan, M. A. Glaser, E. Korblova, D. M. Walba, J. A. Rego, E. A. Soto-Bustamante, and N. A. Clark,听Soft Matter听听9, 462鈥�471 (2013).听听DOI: 10.1039/c2sm25997d
11. "Athermal photofluidization of glasses," G. J. Fang, J. E. Maclennan, Y. Yi, M. A. Glaser, M. Farrow, E. Korblova, D. M. Walba, T. E. Furtak, and N. A. Clark,听Nature Communications听4, 1521 (2013).听听DOI: 10.1038/ncomms2483
12. "Spontaneous Fluid Ferroelectric Order in a Bent-Core Liquid Crystal of听 Orthorhombic Smectic Layers," R. A. Reddy, C. Zhu, R. Shao, E. Korblova, T. Gong,听 Y. Shen, E. Garcia, M. A. Glaser, J. E. Maclennan, D. M. Walba, and听 N. A. Clark,听Science听332, 72鈥�77 (2011).听DOI: 10.1126/science.1197248
13. "Chiral Isotropic Liquids from Achiral Molecules," L. E. Hough, M. Spannuth, M. Nakata, D. A. Coleman, C. D. Jones, G. Dantlgraber, C. Tschierske, J. Watanabe, E. K枚rblova, D. M. Walba, J. E. Maclennan, M. A. Glaser, N. A. Clark,听Science听25, 452鈥�456 (2009).
14. "Organization of liquid crystals on submicron scale topographic patterns with fourfold symmetry prepared by thiolene photopolymerization-based nanoimprint lithography," Y. W. Yi, V. Khire, C. N. Bowman, J. E. Maclennan, and N. A. Clark,听Journal of Applied Physics听103, 093518 (2008).
15. "Direct Measurement of Interaction Forces between Islands on Freely Suspended Smectic C Films using Multiple Optical Tweezers," A. Pattanaporkratana, C. S. Park, J. E. Maclennan, and N. A. Clark, Ferroelectrics听344, 71 (2006).
16. "Electric Field Induced Chirality Flipping in Smectic Liquid Crystals," M. Nakata, R.-F. Shao, J. E. Maclennan, W. Weissflog, and N. A. Clark,听Physical Review Letters听96, 067802 (2006).
17. "Polarization-Modulated Smectic Liquid Crystal Phases," D. A. Coleman, J. Fernsler, N.Chattham, M. Nakata, Y. Takanishi, E. Korblova, D. R.Link, R.-F.Shao, W.G. Jang, J. E. Maclennan, O. Mondain-Monval, C. Boyer, W. Weissflog, G. Pelzl, L.-C. Chien, J. Zasadzinski, J. Watanabe, D. M. Walba, H. Takezoe, and N. A. Clark,听Science听301, 1204-1211 (2003).
18. "Control of Molecular Orientation in Electrostatically Stabilized Ferroelectric Liquid Crystals," D. Coleman, D. Mueller, N. A. Clark, J. E. Maclennan, R.-F. Shao, S. Bardon, and D. M. Walba,听Physical Review Letters听91, 175505 (2003).