Publications: 2012-2016



1. Fact or Fiction: Cybotactic Groups in the Nematic Phase of Bent Core Mesogens, B.R. Acharya and S. Kumar, pp 427-448, Chapter 13 in “Liquid Crystals Beyond Displays”, Editor Q. Li, Wiley and Sons (2012).

2. Hybrid Calamitic and Bent-core Dimeric Mesogens and Their Biaxial SmA and Nematic Phases, Y. Wang, H.-G. Yoon, H. K. Bisoyi,  S. Kumar and Q. Li, J. Materials Chemistry 22, 20363 (2012).

3. Doping the nematic liquid crystal 5CB with milled BaTiO3 nanoparticles, A. Lorenz, N. Zimmerman, S. Kumar, D. R. Evans, G. Cook, and H. S. Kitzerow, Phys. Rev. E 86, 051704 (2012).



1. Room Temperature Thermotropic Liquid Crystal Phases of Novel Catanionic Surfactants Derived from Quaternary Ammonium Surfactants and Bis(2-ethyl)sulfosuccinate, R. Jose. T. J. Patel. P. K. Bhowmik, T. A. Cather, R. R. Davilla, J. Grebowicz, S. Han, D. M. Agra-Koooijman, and S. Kumar,  J. Colloid & Inter. Sci. 411, 61-68 (2013).

2. Soft Elasticity in Main Chain Liquid Crystal Elastomers, S. Dey, D.M. Agra-Kooijman, W. Ren, P.J. McMullan, A. C. Griffin, and S. Kumar, Crystals 3, 363-390, (2013).

3. Doping a mixture of two smectogenic molecular species with BaTiO3-nanoparticles, A. Lorenz, N. Zimmerman, S. Kumar, D. R. Evans, G. Cook, M. F. Martinez, and H. S. Kitzerow, J. Phys. Chem. B 117, 937−941 (2013).

4.  5,5’-Bis-(Alkylpyridinyl-2,2’-Bithiophenes: Synthesis, Liquid Crystalline Behavior, and Charge Transport, Y. A. Getmanenko, S.-W. Kang, N. Shakya, C. Pokhrel, S. D. Bunge, S. Kumar, B D. Ellman, and R. J. Twieg, J. Mat. Chem. C 2 (2), 256 (2014).

5. Bilayers in Nanoparticle-Doped Polar Mesogens, A. Lorenz, D. M. Agra-Kooijman, N. Zimmermann, H.-S. Kitzerow, D. R. Evans, and S. Kumar, Phys. Rev. E 88, 062505 (2013).

6. Board-like dibenzo[fg,op]napthacenecs: Synthesis, characterization, self-assembly, and liquid crystallinity, J. He, D. M. Agra-Kooijman, G. Singh, C. Wang, C. Dugger, L. Zang, J. Zeng, L. Zang, S. Kumar, and C. S. Hartley, J. Mater. Chem. C, 1, 5833–5836 (2013).

7. X-ray scattering of a nematic liquid crystal nano-dispersion with negative dielectric anisotropy, A. Lorenz, N. Zimmermann, S. Kumar, S.R. Evans, G. Cook, M. F. Martinez, and H. S. Kitzerow, Applied Optics 52, E1-E5 (2013).


1. Near infrared light-driven liquid crystal phase transition enabled by hydrophobic mesogen grafted plasmonic gold nanorods, Karla G. Gutierrez-Cuevas, L. Wang, C. Xue, G. Singh, S. Kumar, A. Urbas, and Q. Li, ChemComm. 51, 9845 (2015).

2. Near-infrared light-directing self-organized 3D photonic superstructures loaded with anisotropic plasmonic hybrid nanorods, L. Wang, Karla G. Gutierrez-Cuevas, H. K. Bisoyi, J. Xiang, G. Singh, Rafel S. Zola, S. Kumar, Oleg D. Larventovich, A. Urbas, and Quan Li, ChemComm. 51, 15039 (2015).

3. Dual relaxation and structural changes under uniaxial strain in main-chain smectic-C liquid crystal elastomer, D.M. Agra-Kooijman, M. Fisch, L. Joshi, W. Ren, P. McMullan, A. Griffin and Satyen Kumar, Phys. Chem. Chem. Phys. 17, 191(2015).

4. Room temperature heliconical twist-bend nematic liquid crystal, Y. Wang, G. Singh, D.M. Agra-Kooijman, M. Gao, H. K. Bisoyi, C. M. Xue, M. R. Fisch, S. Kumar, and Q. Li,Cryst. Eng. Comm. 17, 2778 (2015).

5. Competitive cation binding to Phosphatidylinositol-4,5-bisphosphate domains revealed by X-ray fluorescence, Zachary T. Graber, W. Wang, G. Singh, I. Kuzmenko, D. Vaknin, and Edgar E. Kooijman, RSC Advances 5, 106536 (2015).


1. X-ray and Raman scattering study of orientational order in nematic and heliconical nematic liquid crystals, G. Singh, J. Fu, D.M. Agra-Kooijman, J-K. Song, M. R. Vengatesan, M. Srinivasarao,M.R. Fisch, S. Kumar, Phys. Rev. E 94, 060701(R) (2016).

2. Thermotropic liquid-crystalline properties of 4,4'-dialkoxy- 3,3'-diaminobiphenyl compounds and their precursors, S. Killarney, D. M. Agra-Kooijman, T. Harris, J. Koh, O. Tanthmanatham, H. Han, M. Fisch, L. Sharpnack, S. Kumar, and P. Bhowmik, Liq. Cryst. 43, 1560 (2016).

3. Structures: Liquid Crystals, G. Singh, S. Kumar and S. -W. Kang, Reference Module in Materials Science and Materials Engineering. Oxford: Elsevier pp.1-13 (2016).

4. Emissivity and electro-optical properties of semiconducting quantum dots/rods and liquid crystal composites: A Review, G. Singh, M. R. Fisch and S. Kumar, Rep. Prog. Phys. 79, 056502 (2016).

5. Development of a scanning time of flight microscope and its application to the study of charge transport in phase separated structured organic semiconductors, S. Paul, B. Ellman, S. Tripathi, G. Singh, and R. Twieg, J. Appl. Phys. 119, 145501 (2016).

6. A reversible isothermal twist-bend nematic-nematic phase transition driven by the photoisomerisation of an azobenzene-based nonsymmetric liquid crystal dimer, D.A. Peterson, J. Xiang, G. Singh, R. Walker, D.M. Agra-Kooijman, A. Martinez-Felipe, J. M.D. Storey, M. Gao, S. Kumar, O.D. Lavrentovich, and C.T. Imrie, J. of Am. Chem. Soc. 138, 5283 (2016).

7. Smectic-A and hexatic-B liquid crystal phases of sanidic alkyl-substituted dibenzo[fg,op]naphthacenes, P. J. Repasky, D. M. Agra-Kooijman, S. Kumar, and C. Scott Hartley, J. Phys. Chem. B 120, 2829 (2016): DOI: 10.1021/acs.jpcb.5b10990.


1. Columnar molecular aggregation in the aqueous solutions of disodium cromoglycate, D. Agra-Kooijman, G. Singh, A. Lorenz, P. Coolings, H. Kitzerow and S. Kumar,  PRE 89,062504 (2014).

2. Origin of weak layer contraction in de Vries smectic liquid crystals, D. Agra-Kooijman, H-G. Yoon, S. Dey and S. Kumar, PRE 89, 032506 (2014).

3. Thermotropic mesomorphism in catanionic surfactants synthesized from quaternary ammonium surfactants and sodium dodecylbenzenesulfonate: Effect of chain length and symmetry, R. Jose, T. J. Patel, T. A. Cather, D. J. Willhelm, J. Grebowics, H. Han, P. K. Bhowmik, L. Sharpnack, D. M. Agra-Kooijman and S. Kumar, Coll. and Surf. A: Physicochem. and Eng. Aspects 461, 40 (2014).

4. 5 Bis(5-alkylthiophen-2-yl)arene liquid crystals as molecular semiconductors, Y. A. Getmanenko, S.-W. Kang, N. Shakya, C. Pokhrel, S. D. Bunge, S. Kumar, B D. Ellman, and R. J. Twieg, J. Mat. Chem. C 2 (14), 2600 (2014).