Indian Institute of Technology Indore

About: Indian Institute of Technology Indore is a education organization based out in Indore, Madhya Pradesh, India. It is known for research contribution in the topics: Computer science & Chemistry. The organization has 1606 authors who have published 4803 publications receiving 66500 citations.

Design and synthesis of donor–acceptor pyrazabole derivatives for multiphoton absorption

Abstract: A series of ferrocenyl substituted pyrazaboles were prepared, which have an electron-withdrawing pyrazabole moiety as the central core, with a D–π–A–π–D structural motif (D = donor, A = acceptor) and containing a variety of π bridges. A crystallographic study reveals that the pyrazabole central core was observed in planar geometry. Strong two-photon absorption in the visible region and three-photon absorption in the near IR region were observed in the ferrocenyl substituted pyrazaboles. It was observed that the 2PA absorption cross-section increases with the conjugation length.

Impact of molybdenum out diffusion and interface quality on the performance of sputter grown CZTS based solar cells

Abstract: We have investigated the impact of Cu2ZnSnS4-Molybdenum (Mo) interface quality on the performance of sputter-grown Cu2ZnSnS4 (CZTS) solar cell. Thin film CZTS was deposited by sputter deposition technique using stoichiometry quaternary CZTS target. Formation of molybdenum sulphide (MoSx) interfacial layer is observed in sputter grown CZTS films after sulphurization. Thickness of MoSx layer is found ~142 nm when CZTS layer (550 nm thick) is sulphurized at 600 °C. Thickness of MoSx layer significantly increased to ~240 nm in case of thicker CZTS layer (650 nm) under similar sulphurization condition. We also observe that high temperature (600 °C) annealing suppress the elemental impurities (Cu, Zn, Sn) at interfacial layer. The amount of out-diffused Mo significantly varies with the change in sulphurization temperature. The out-diffused Mo into CZTS layer and reconstructed interfacial layer remarkably decreases series resistance and increases shunt resistance of the solar cell. The overall efficiency of the solar cell is improved by nearly five times when 600 °C sulphurized CZTS layer is applied in place of 500 °C sulphurized layer. Molybdenum and sulphur diffusion reconstruct the interface layer during heat treatment and play the major role in charge carrier dynamics of a photovoltaic device.

A spectroscopic investigation and molecular docking study on the interaction of hen egg white lysozyme with liposomes of saturated and unsaturated phosphocholines probed by an anticancer drug ellipticine.

Abstract: Interaction of hen egg white lysozyme with different liposomes made of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC), 1,2-dimyristoyl-sn-glycero-3-phosphocholine (DMPC), 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and 2-oleoyl-1-palmitoyl-sn-glycero-3-phosphocholine (POPC) was studied by circular dichroism (CD), steady state and time resolved fluorescence spectroscopy. We used anticancer drug ellipticine and studied its entrapment and release from liposomes upon interaction with lysozyme. The molecular docking study revealed that ellipticine preferably binds to the hydrophobic pocket of lysozyme (Kbinding = 1.09 × 106 M−1). The binding was also supported by spectroscopic evidence. Addition of lysozyme to the ellipticine impregnated liposomes caused quenching of the fluorescence intensity of ellipticine as lysozyme induces hydration and phospholipid rearrangement in the bilayers leading to the leakage of drug molecules. The extent of quenching depends on the prehydration level of liposomes. Maximum quenching took place in the DPPC liposome as it is the least hydrated while minimum quenching was observed in the DOPC liposome having the highest hydration level among all the lipids. The time resolved studies revealed that both the fast and slow lifetime components of ellipticine decrease significantly with addition of lysozyme. This fact is attributed to lysozyme induced hydration and rupture of bilayers. It is revealed that upon addition of lysozyme to liposomes, the amplitude of the fast component increases and that of the slow component decreases which imply that the drug molecules are released from liposomes and subsequent migration takes place to the aqueous phase. Molecular docking studies and fluorescence measurements indicate that ellipticine after removal from the liposome binds to the hydrophobic binding site of lysozyme.

Cognitive Relaying With Transceiver Hardware Impairments Under Interference Constraints

Abstract: In this letter, we analyze the performance of cognitive amplify-and-forward multirelay networks with active direct link in the presence of relay transceiver hardware impairments. Considering distortion noises on both interference and main data links, we derive tight closed-form outage probability expressions and their asymptotic behavior for partial relay selection (PRS) and opportunistic relay selection (ORS) schemes over Rayleigh fading channels. Both PRS and ORS schemes are found to attain full diversity for low target rates only, otherwise a relay cooperation ceiling (RCC) phenomenon occurs. We further illustrate that a perfect direct link can partially compensate for this RCC effect over high data rates for the two considered schemes. Numerical and simulation results validate our theoretical analysis.