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187 results on '"Dalapati, Sasanka"'

1. Electro-optic controllable disordered photonic crystal for Anderson localization of light in real time

Author

Manna, Suman Kalyan, Dupont, Laurent, and Dalapati, Sasanka

Subjects
Physics - Optics
Abstract

Anderson localization is a ubiquitous interference phenomenon in which waves fail to propagate in a disordered medium. Unlike in a classical resonator, satisfying the favorable condition for the interference in a disordered medium is truly a statistical problem in physics. Recent progress in realizing Anderson localization is mainly limited to the iterative method for optimizing the disordered medium. Availability of an in-situ, active control for optimization surely paves the way of realizing the Anderson localization and its applications. In this letter, we have proposed an electro-optic controllable disordered photonic crystal and demonstrated its performance in terms of Anderson localization of light in situ in real time by application of an external electric field. We believe that Anderson localization using this medium is not only expected to address the scientific rigors but also to introduce an extra degree of freedom i.e., the tunability in its technical applications., Comment: 7 pages, 4 figures

Published
2019

2. Two-dimensional sp2 carbon–conjugated covalent organic frameworks

Author

Jin, Enquan, Asada, Mizue, Xu, Qing, Dalapati, Sasanka, Addicoat, Matthew A, Brady, Michael A, Xu, Hong, Nakamura, Toshikazu, Heine, Thomas, Chen, Qiuhong, and Jiang, Donglin

Subjects
Macromolecular and Materials Chemistry, Chemical Sciences, General Science & Technology
Abstract

We synthesized a two-dimensional (2D) crystalline covalent organic framework (sp2c-COF) that was designed to be fully π-conjugated and constructed from all sp2 carbons by C=C condensation reactions of tetrakis(4-formylphenyl)pyrene and 1,4-phenylenediacetonitrile. The C=C linkages topologically connect pyrene knots at regular intervals into a 2D lattice with π conjugations extended along both x and y directions and develop an eclipsed layer framework rather than the more conventionally obtained disordered structures. The sp2c-COF is a semiconductor with a discrete band gap of 1.9 electron volts and can be chemically oxidized to enhance conductivity by 12 orders of magnitude. The generated radicals are confined on the pyrene knots, enabling the formation of a paramagnetic carbon structure with high spin density. The sp2 carbon framework induces ferromagnetic phase transition to develop spin-spin coherence and align spins unidirectionally across the material.

Published
2017

29. A lanthanide-functionalized covalent triazine framework as a physiological molecular thermometer

Author

Gohari Derakhshandeh, Parviz, primary, Abednatanzi, Sara, additional, Bourda, Laurens, additional, Dalapati, Sasanka, additional, Abalymov, Anatolii, additional, Meledina, Maria, additional, Liu, Ying-Ya, additional, Skirtach, Andre G., additional, Van Hecke, Kristof, additional, Kaczmarek, Anna M., additional, and Van Der Voort, Pascal, additional

Published
2021
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34. Metformin‐Templated Nanoporous ZnO and Covalent Organic Framework Heterojunction Photoanode for Photoelectrochemical Water Oxidation.

Author

Chatterjee, Sauvik, Bhanja, Piyali, Ghosh, Dibyendu, Kumar, Praveen, Kanti Das, Sabuj, Dalapati, Sasanka, and Bhaumik, Asim

Subjects
OXIDATION of water, WIDE gap semiconductors, HETEROJUNCTIONS, PHOTOCATHODES, POWER resources, NANOCOMPOSITE materials, HYDROTHERMAL synthesis
Abstract

Photoelectrochemical water‐splitting offers unique opportunity in the utilization of abundant solar light energy and water resources to produce hydrogen (renewable energy) and oxygen (clean environment) in the presence of a semiconductor photoanode. Zinc oxide (ZnO), a wide bandgap semiconductor is found to crystallize predominantly in the hexagonal wurtzite phase. Herein, we first report a new crystalline triclinic phase of ZnO by using N‐rich antidiabetic drug metformin as a template via hydrothermal synthesis with self‐assembled nanorod‐like particle morphology. We have fabricated a heterojunction nanocomposite charge carrier photoanode by coupling this porous ZnO with a covalent organic framework, which displayed highly enhanced photocurrent density of 0.62 mA/cm2 at 0.2 V vs. RHE in photoelectrochemical water oxidation and excellent photon‐to‐current conversion efficiency at near‐neutral pH vis‐à‐vis bulk ZnO. This enhancement of the photocurrent for the porous ZnO/COF nanocomposite material over the corresponding bulk ZnO could be attributed to the visible light energy absorption by COF and subsequent efficient charge‐carrier mobility via porous ZnO surface. [ABSTRACT FROM AUTHOR]

Published
2021
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37. Two-dimensional sp 2 carbon–conjugated covalent organic frameworks

Author

Jin, Enquan, primary, Asada, Mizue, additional, Xu, Qing, additional, Dalapati, Sasanka, additional, Addicoat, Matthew A., additional, Brady, Michael A., additional, Xu, Hong, additional, Nakamura, Toshikazu, additional, Heine, Thomas, additional, Chen, Qiuhong, additional, and Jiang, Donglin, additional

Published
2017
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41. A new triazine based π-conjugated mesoporous 2D covalent organic framework: its in vitro anticancer activities.

Author

Kanti Das, Sabuj, Mishra, Snehasis, Manna, Krishnendu, Kayal, Utpal, Mahapatra, Supratim, Das Saha, Krishna, Dalapati, Sasanka, Das, G. P., Mostafa, Amany A., and Bhaumik, Asim

Subjects
TRIAZINES, MESOPOROUS materials, METAL-organic frameworks, POLYCONDENSATION, IN vitro studies, ANTINEOPLASTIC agents
Abstract

We report a new highly crystalline 2D π-conjugated hexagonal mesoporous covalent organic framework material, TrzCOF, through the solvothermal polycondensation of 1,3,5-tri(4-formylbiphenyl) benzene [Ph7(CHO)3, TFBPB] with 2,4,6-tris(4-aminophenyl)-1,3,5-triazine (TAPT) and it displayed excellent anticancer activity for human colorectal carcinoma HCT-116 cells. [ABSTRACT FROM AUTHOR]

Published
2018
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