Indian Association for the Cultivation of Science

About: Indian Association for the Cultivation of Science is a education organization based out in Kolkata, India. It is known for research contribution in the topics: Catalysis & Excited state. The organization has 3867 authors who have published 10457 publications receiving 220098 citations.

Design and development of quantum dots and other nanoparticles based cellular imaging probe

Abstract: One goal of nanotechnology is to prepare cellular nanoprobes for various biological applications where conventional molecular probes fall short of long-term stability and simultaneous detection of multiple signals. Successful development of cellular nanoprobes requires the availability of a library of functional nanoparticles, knowledge of their interactions with cells and mechanism of cellular entry and to modulate these interactions by appropriate design of surface functionality. Although a great deal of research has been done in past 15 years, only limited success has been achieved in live cell labeling with high specificity, sub-cellular targeting and single molecule trafficking. This article focuses on the author's effort in making cellular imaging nanoprobes from different nanoparticles and discusses the most critical issues in the context of current knowledge, such as different variables that often influence labeling, non-specific binding/uptake of nanoprobes and specific live cell labeling. Finally, the important role of coating chemistry to overcome these problems has been highlighted and some successful labeling results have been summarized.

A New Series of ZnII Coordination Polymer Based Metallogels Derived from Bis-pyridyl-bis-amide Ligands: A Crystal Engineering Approach

Abstract: On the basis of a recently demonstrated crystal engineering strategy, two hydrogen bond equipped bidentate ligands, namely, N,N′-bis-(3-pyridyl)isophthalamide L1 and N,N′-bis-(3-pyridyl)terephthalamide L2, have been exploited to generate a new series of ZnII-coordination polymer based metallogels. As many as 12 metallogels have been prepared by the reaction of these ligands with various ZnII halides under various conditions. The gels were characterized by rheology, scanning electron microscopy (SEM), and powder X-ray diffraction (PXRD). A structure−property correlation study based on the PXRD of the xerogels and single crystal X-ray diffraction (SXRD) data of some of the isolated single crystals of the reaction products clearly establishes the structures of the gel fibers in the xerogels and supports the crystal engineering based design strategy based on which metallogels are prepared.

Self-assembled mesoporous TiO2 spherical nanoparticles by a new templating pathway and its enhanced photoconductivity in the presence of an organic dye

Abstract: The supramolecular assembly of ionic/non-ionic surfactants has been extensively employed as a template or structure directing agent (SDA) in the synthesis of a large variety of mesoporous materials over the past one and a half decades. Herein, we report the first highly efficient synthesis strategy for self-assembled mesoporous TiO2 materials with well-defined crystal morphologies using sodium salicylate as a template. Mesoporous TiO2 nanoparticles showed a drastically enhanced photoelectrochemical response under visible light irradiation after entrapping a photosensitizer molecule (dye) inside the mesopores. The efficient synthesis strategy and enhanced photoresponse of these mesoporous TiO2 materials could facilitate the design of other porous semiconductor oxides and their applications in photon-to-electron conversion processes.