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335 results on '"Srinivasarao, Mohan"'

23. Contributors

Author

Bradbury, Roy R., primary, Carr, Kathryn K., additional, Corbett, John F., additional, Freeman, Harold S., additional, de Moura, João, additional, Filosa, Michael, additional, Hinz, Zbigniew J., additional, Inouye, Masahiko, additional, Matsuoka, Masaru, additional, Pavlopoulos, Theodore, additional, Peters, Arnold T., additional, Püntener, Alois G., additional, Schlesinger, Ulrich, additional, Senackerib, Joseph F., additional, Srinivasarao, Mohan, additional, and Waller, David, additional

Published
2000
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30. Curvature-Induced Twist in Homeotropic Nematic Tori

Author

Ellis, Perry W., primary, Nayani, Karthik, additional, McInerney, James P., additional, Rocklin, D. Zeb, additional, Park, Jung Ok, additional, Srinivasarao, Mohan, additional, Matsumoto, Elisabetta A., additional, and Fernandez-Nieves, Alberto, additional

Published
2018
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33. Thermally switchable liquid crystals based on cellulose nanocrystals with patchy polymer grafts

Author

Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Risteen, Bailey, Delepierre, Gwendoline, Srinivasarao, Mohan, Weder, Christoph, Russo, Paul, Reichmanis, Elsa, Zoppe, Justin Orazio, Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Risteen, Bailey, Delepierre, Gwendoline, Srinivasarao, Mohan, Weder, Christoph, Russo, Paul, Reichmanis, Elsa, and Zoppe, Justin Orazio

Abstract

A thermally “switchable” liquid-crystalline (LC) phase is observed in aqueous suspensions of cellulose nanocrystals (CNCs) featuring patchy grafts of the thermoresponsive polymer poly(N-isopropylacrylamide) (PNIPAM). “Patchy” polymer decoration of the CNCs is achieved by preferential attachment of an atom transfer radical polymerization (ATRP) initiator to the ends of the rods and subsequent surface-initiated ATRP. The patchy PNIPAM-grafted CNCs display a higher colloidal stability above the lower critical solution temperature (LCST) of PNIPAM than CNCs decorated with PNIPAM in a brush-like manner. A 10 wt% suspension of the “patchy” PNIPAM-modified CNCs displays birefringence at room temperature, indicating the presence of an LC phase. When heated above the LCST of PNIPAM, the birefringence disappears, indicating the transition to an isotropic phase. This switching is reversible and appears to be driven by the collapse of the PNIPAM chains above the LCST, causing a reduction of the rods' packing density and an increase in translational and rotational freedom. Suspensions of the “brush” PNIPAM-modified CNCs display a different behavior. Heating above the LCST causes phase separation, likely because the chain collapse renders the particles more hydrophobic. The thermal switching observed for the “patchy” PNIPAM-modified CNCs is unprecedented and possibly useful for sensing and smart packaging applications., Peer Reviewed, Postprint (updated version)

Published
2018

35. Supporting Information from Imaging optical scattering of butterfly wing scales with a microscope

Author

Jinxin Fu, Beom-Jin Yoon, Park, Jung Ok, and Srinivasarao, Mohan

Abstract

A new optical method is proposed to investigate the reflectance of structurally coloured objects, such as Morpho butterfly wing scales and cholesteric liquid crystals. Using a reflected-light microscope and a digital single-lens reflex (DSLR) camera, we have successfully measured the two-dimensional reflection pattern of individual wing scales of Morpho butterflies.We demonstrate that this method enables us to measure the bidirectional reflectance distribution function (BRDF). The scattering image observed in the back focal plane of the objective is projected onto the camera sensor by inserting a Bertrand lens in the optical path of the microscope. With monochromatic light illumination, we quantify the angle-dependent reflectance spectra from the wing scales of Morpho rhetenor by retrieving the raw signal from the digital camera sensor. We also demonstrate that the polarization-dependent reflection of individual wing scales is readily observed using this method, using the individual wing scales of Morpho cypris. In an effort to show the generality of the method, we used a chiral nematic fluid to illustrate the angle-dependent reflectance as seen by this method.

Published
2017
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36. Traversing the 'top-down/bottom-up' divide: molecular-scale lithography of self-assembled ribbons

Author

Jarvholm, Jonas, Srinivasarao, Mohan, and Tolbert, Laren M.

Subjects
Rayleigh number -- Usage, Silicon -- Electric properties, Silicon -- Chemical properties, X-rays -- Diffraction, X-rays -- Usage, Chemistry
Abstract

A concept for the 'top-down/bottom-up' approach is proposed for which the feature size is not limited by wavelength. The feature size has not depended on the Rayleigh limit but only on the size of the self-assembled structures.

Published
2009

42. Permanent bubble: arrays from a cross-linked poly(para-phenyleneethynylene): picoliter holes without microfabrication

Author

Erdogan, Belma, Song, Lulu, Wilson, James N., Park, Jung O., and Srinivasarao, Mohan; Bunz, Uwe H. F.

Subjects
Electrophoresis -- Analysis, Laboratory equipment -- Analysis, Organic semiconductors -- Analysis, Chemistry
Abstract

The arrays of self-assembled picoliter holes1-7 fabricated from poly (para-henyleneethynylene) (PPE, 4) are described. The thermal cross-linking of these arrays, leads to their collapse under formation of self-assembled picoliter hole array with a density of approximately 40000 holes per mm2.

Published
2004

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