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33 results on '"Clement, J. Arul"'

5. Steering with light: indexable photomotility in liquid crystalline polymers

Author

Babaei, Mahnoush, Clement, J. Arul, Dayal, Kaushik, Shankar, M. Ravi, Babaei, Mahnoush, Clement, J. Arul, Dayal, Kaushik, and Shankar, M. Ravi

Abstract

Harnessing light to achieve manipulation and motility in meso and mm-scale systems offers the ability to remotely trigger actuation without requiring on-board power. Central to achieving macroscopic photomotility is the generation of asymmetric interaction between the light-responsive actuator and a substrate. Here, we demonstrate a facile route for achieving indexable, stepped translation of structures fabricated from azobenzene-functionalize liquid crystalline polymers (ALCP). The symmetry breaking in the dynamics of coiling (during irradiation) and uncoiling (when the light is turned off) as a function of the director orientation in splayed ALCP strips leads to asymmetric reaction forces in the interaction with a surface. The broken symmetry leads to directional translation of the center of mass in discrete steps for each on/off cycle of irradiation. Creating composite structures offers a route for hard-coding the trajectories of motility across a range of trajectories that are either rectilinear or curvilinear. Expanding this approach can offer a framework for achieving steerable light-powered microrobots that can translate on arbitrary surface topographies.

Published
2017

30. Regioselective Annulation of Unsymmetrical 1,2-Phenylenebis(diaryl/ diheteroarylmethanol): A Facile Synthesis of Anthracene, Tetracene, and Naphtho[b]thiophene Analogues.

Author

Sivasakthikumaran, Ramakrishnan, Rafiq, Settu Muhammad, Sankar, Elumalai, Clement, J. Arul, and Mohanakrishnan, Arasambattu K.

Subjects
PHENYLENE compounds, ANNULATION, ANTHRACENE, THIOPHENES, HYDROGEN bromide, ISOBENZOFURAN
Abstract

A systematic study on the regioselective cyclization of benzene- and naphthalene-based unsymmetrical diols with HBr (33%) in acetic acid at room temperature led to the formation of annulation products. By using this method, synthesis of a wide variety of anthracene, tetracene and naphtho[b]thiophene analogues was achieved in good to excellent yields. By employing HBr (33%) in acetic acid as a catalyst for regioselective cyclization of unsymmetrical diols was very facile and devoid of commonly encountered dihydroisobenzofuran formation. [ABSTRACT FROM AUTHOR]

Published
2015
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33. 5,7-Bis(1-benzothio-phen-2-yl)-2,3-dihydro-thieno[3,4-b][1,4]dioxine.

Author

Sugumar P, Ranjith S, Clement JA, Mohanakrishnan AK, and Ponnuswamy MN

Abstract

In the title compound, C(22)H(14)O(2)S(3), the dioxane ring is disordered over two sites [site occupancies = 0.623 (3) and 0.377 (3)]; both components adopt half-chair conformations. The two benzothio-phene ring systems are asymmetrically twisted away from the attached thio-phene ring [dihedral angles = 20.57 (3) and 6.70 (3)°] and are oriented at an angle of 26.83 (3)°. No significant hydrogen bonding or π-π inter-actions are observed in the crystal structure.

Published
2008
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