Vandana Shinde

Bio: Vandana Shinde is an academic researcher. The author has an hindex of 1, co-authored 3 publications receiving 4 citations.

Synthesis of Nanoparticle Assemblies: general discussion

Abstract: Madhura Som, Sristi Majumdar, Nirmalya Bachhar, Guruswamy Kumaraswamy, G. V. Pavan Kumar, Vinothan N. Manoharan, Sanat Kumar, Madivala G. Basavaraj, Siddharth Kulkarni, Ranjini Bandyopadhyay, Sudeep Punnathanam, Himani Medhi, Ajeet Srivastav, Daan Frenkel, Mukta Tripathy, Erika Eiser, Lola Gonzalez-Garcia, Priyadarshi Roy Chowdhury, Jayant Singh, Vimala Sridurai, Alison Edwards, B. L. V. Prasad, Amit Kumar Singh, Michael Bockstaller, Neena S. John, Jyoti Seth, Mayank Misra, Charusita Chakravarty, Vandana Shinde, Rajdip Bandyopadhyaya, Jacques Jestin, Radhika Poojari, Nicholas Kotov, Oleg Gang, Alamgir Karim, Yon Ju-Nam, Steve Granick, Semen Chervinskii and Andrea Tao

Nanoparticle Assembly: A Perspective and some Unanswered Questions

Abstract: CURRENT SCIENCE, VOL. 112, NO. 8, 25 APRIL 2017 1635 Sanat K. Kumar and Oleg Gang are in the Department of Chemical Engineering, Columbia University, New York, NY 10027, USA; Guruswamy Kumaraswamy is in the Polymer Science and Engineering Division, CSIR-National Chemical Laboratory; and Bhagavatula L. V. Prasad is in the Physical/Materials Chemistry Division, CSIR-National Chemical Laboratory, Pune 411 008, India; Rajdip Bandyopadhyaya is in the Department of Chemical Engineering, Indian Institute of Technology-Bombay, Mumbai 400 076, India; Steve Granick is in the IBS Center for Soft and Living Matter, Ulsan National Institute of Science and Technology, Ulsan, 44919, Republic of Korea; Oleg Gang is also with the Center for Functional Nanomaterials, Brookhaven National Laboratories, Upton, New York, NY11973-5000, USA; Vinothan N. Manoharan is in the School of Engineering and Applied Sciences and Department of Physics, Harvard University, Cambridge, MA 02138, USA; Daan Frenkel is in the Department of Chemistry, Cambridge University, Cambridge, CB2 1TN, UK; Nicholas Kotov is in the Department of Chemical Engineering, Biointerfaces Institute, University of Michigan, Ann Arbor, MI 48109, USA. *For correspondence. (e-mail: sk2794@columbia.edu; g.kumaraswamy@ncl.res.in; pl.bhagavatula@ncl.res.in) Nanoparticle assembly: a perspective and some unanswered questions

Cholesteric and screw-like nematic phases in systems of helical particles.

Abstract: Recent numerical simulations of hard helical particle systems unveiled the existence of a novel chiral nematic phase, termed screw-like, characterised by the helical organization of the particle C2 symmetry axes round the nematic director with periodicity equal to the particle pitch. This phase forms at high density and can follow a less dense uniform nematic phase, with relative occurrence of the two phases depending on the helix morphology. Since these numerical simulations were conducted under three-dimensional periodic boundary conditions, two questions could remain open. First, the real nature of the lower density nematic phase, expected to be cholesteric. Second, the influence that the latter, once allowed to form, may have on the existence and stability of the screw-like nematic phase. To address these questions, we have performed Monte Carlo and molecular dynamics numerical simulations of helical particle systems confined between two parallel repulsive walls. We have found that the removal of the periodicity constraint along one direction allows a relatively-long-pitch cholesteric phase to form, in lieu of the uniform nematic phase, with helical axis perpendicular to the walls while the existence and stability of the screw-like nematic phase are not appreciably affected by this change of boundary conditions.

Cholesteric and screw-like nematic phases in systems of helical particles

Abstract: Recent numerical simulations of hard helical particle systems unveiled the existence of a novel chiral nematic phase, termed screw-like, characterised by the helical organization of the particle C$_2$ symmetry axes round the nematic director with periodicity equal to the particle pitch. This phase forms at high density and can follow a less dense uniform nematic phase, with relative occurrence of the two phases depending on the helix morphology. Since these numerical simulations were conducted under three-dimensional periodic boundary conditions, two questions could remain open. Firstly, the real nature of the lower density nematic phase, expected to be cholesteric. Secondly, the influence that the latter, once allowed to form, may have on the existence and stability of the screw-like nematic phase. To address these questions, we have performed Monte Carlo and molecular dynamics numerical simulations of helical particle systems confined between two parallel repulsive walls. We have found that removal of the periodicity constraint along one direction allows a relatively-long-pitch cholesteric phase to form, in lieu of the uniform nematic phase, with helical axis perpendicular to the walls while the existence and stability of the screw-like nematic phase are not appreciably affected by this change of boundary conditions.