CSIR – National Institute for Interdisciplinary Science and Technology (NIIST)

Council of Scientific & Industrial Research (CSIR), Govt.Of India Thiruvananthapuram.

Research Highlights

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    Color-Tunable Cyano-Substituted Divinylene Arene…

    F. Aparicio, S. Cherumukkil, A. Ajayaghosh* and L. Sánchez*
    Color-Tunable Cyano-Substituted Divinylene Arene Luminogens as Fluorescent pi-Gelators
    The synthesis of three cyano-substituted divinylene pi-gelators is reported. The modulation of the color is achieved by placing the cyano groups in appropriate position of the conjugated backbone, thus modulating the donor−acceptor interaction. Variable-temperature UV/Vis data have been utilized to [...]

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    Molecular,Crystalline,and Lamellar Length-Scale…

    P.Shaiju, N. Sanjeeva Murthy and E. Bhoje Gowd*
    Molecular, Crystalline, and Lamellar Length-Scale Changes in the Poly(l-lactide) (PLLA) during Cyclopentanone (CPO) Desorption in PLLA/CPO Cocrystals
    Polymer−solvent complexes, poly(L-lactide) (PLLA) with cyclopentanone (CPO), were studied at multiple length scales using differential scanning calorimetry, small-angle neutron scattering, Fourier transform infrared spectroscopy, and temperature-dependent wide- and small-angle X-ray scattering. PLLA [...]

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    Cross-Linkable Fluorene-Diphenylamine Derivatives For

    Silja Abraham, Gayathri Prabhu T. Ganesh, Sunil Varughese, Biswapriya Deb, and Joshy Joseph*
    Cross-Linkable Fluorene-Diphenylamine Derivatives for Electrochromic Applications
    Multicolor electrochromic systems based on heat cross-linkable arylamine-substituted fluorene derivatives, FD and FDOMe, are reported. These derivatives with pendant vinyl groups have been synthesized by the Buchwald–Hartwig amination reaction and were well-characterized using various analytical and spectroscopic techniques [...]

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    Heteroatom induced contrasting effects on the stimuli responsive properties of anthracene based donor-pi-acceptor fluorophores

    Karattu Chali Naeem, Akhila Subhakumari, Sunil Varughese and Vijayakumar C. Nair*
    Two donor--acceptor type fluorophores consisting of anthracene as the donor and benzoxazole (ABO) or benzothiazole (ABT) as the acceptors are designed and synthesised. Both fluorophores exhibit excellent solid state luminescence, and respond to external stimuli such as mechanical force (mechanochromism) and protons (acidochromism). Though the [...]

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    Shape controlled synthesis of multi-branched gold nanocrystals through a facile one-pot bifunctional biomolecular approach

    M. Sajitha, A. Vindhyasarumi, A. Gopi, and K. Yoosaf *
    Anisotropic nanocrsytals of gold and silver are promising candidates for sensing and therapeutic applications because of their high extinction coefficient, increased NIR response and localization of hot spots at their tips. Herein, we report a viable room temperature synthetic strategy to prepare multi-branched gold nanocrystals of [...]

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    Light Driven Mesoscale Assembly of a Coordination Polymeric Gelator into Flowers and Stars with Distinct Properties

    R. D. Mukhopadhyay, V. K. Praveen, A. Hazra, T. K. Maji and A. Ajayaghosh*
    Control over the self-assembly process of porous organic–inorganic hybrids often leads to unprecedented polymorphism and properties. Herein we demonstrate how light can be a powerful tool to intervene in the kinetically controlled mesoscale self-assembly of a coordination polymeric gelator. Ultraviolet light induced [...]

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    Pyridyl-Amides as a Multimode Self-assembly Driver for the Design of a Stimuli Responsive π-Gelator

    K. K. Kartha, V. K. Praveen, S. S. Babu, S. Cherumukkil and A. Ajayaghosh*
    An oligo(p-phenylenevinylene) (OPV) derivative connected to pyridyl end groups through an amide linkage (OPV-Py) resulted in a multistimuli-responsive pi-gelator. When compared to the corresponding OPV -gelator terminated by a phenyl-amide (OPV-Ph), the aggregation properties of OPV-Py were found to be significantly different, [...]

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    Electrochemically Patterned Transducer with…

    Neethu Kalloor Sadanandhan, Sudha Janardhanan Devaki,* Rohini Kuttiplavil Narayanan, and Molji Cheriyathuchenaaramvalli
    Electrochemically Patterned Transducer with Anisotropic PEDOT through Liquid Crystalline Template Polymerization
    We have demonstrated patterning of highly ordered nanostructured conducting PEDOT (poly(3,4-ethylenedioxythiophene)) on glassy carbon electrode (GCE) through electrochemical polymerization of a biobased liquid crystalline template of EDOT-PDPPA (3-pentadecylphenyl phosphoric acid). Self-assembled “EDOT-PDPPA” in water [...]

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    Syndiotactic Polystyrene/Hybrid Silica Spheres of …

    Angel Mary Joseph, Baku Nagendra, K. P. Surendran*, and E. BhojeGowd*
    Syndiotactic Polystyrene/Hybrid Silica Spheres of POSS Siloxane Composites Exhibiting Ultralow Dielectric ConstantHomogeneously dispersed hybrid silica/syndiotactic polystyrenecomposites were investigated for low-κ dielectric applications. The compositeswere prepared by a solution blending method, and their microstructures wereanalyzed by SEM, TEM, and AFM. Crystallization and phase transformationbehavior of sPS [...]

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    Cold Crystallization of PDMS and PLLA in Poly(L‑lactide‑b‑dimethylsiloxane‑b‑L‑lactide) Triblock Copolymer and Their Effect on Nanostructure Morphology

    S. Nagarajan and E. Bhoje Gowd
    Poly(L-lactide-b-dimethylsiloxane-b-L-lactide)(PLLA-b-PDMS-b-PLLA) triblock copolymer was synthesized by ring-opening polymerization of L-lactide using bis-(hydroxyalkyl)-terminated PDMS as a macroinitiator. The block copolymer was immiscible in the melt, and the melt morphology was preserved upon cooling the melt to −120 °C. It was also observed that at moderate cooling rates PDMS and PLLA blocks [...]

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