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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    Fabrication of Epoxy Vesicles using Self-Assembling Polystyrene–Montmorillonite Nanocomposite Reusable Template

    Prasad Vadakkethonippurathu Sivankuttynair *, Asha Susan Chacko , Bindu P. Nair , Bijini T. Thulasibai , and Pavithran Chorappan
    We report the fabrication of thermoset vesicles using a thermoplastic–clay nanocomposite vesicle reusable template. Epoxy polymer vesicles (EPV) of micrometer diameters were synthesized from bisphenol-A diglycidyl ether resin encapsulated within a self-assembled, polystyrene–montmorillonite hybrid nanocomposite (PCN) template [...]

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    Living Supramolecular Polymerization

    R. D. Mukhopadhyay, A. Ajayaghosh
    Most polymers that we encounter, like those used in grocery bags and soda bottles, are formed from small molecules (monomers) held together by strong covalent bonds. In supramolecular polymerization, monomers bond through weaker reversible interactions, such as hydrogen bonds (H-bonds). Supramolecular polymerization usually proceeds through step-growth mechanisms, where both ends of [...]

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    A Slippery Molecular Assembly Allows Water as a Self-ErasableSecurity Marker

    R. Thirumalai, R. D. Mukhopadhyay, V. K. Praveen, A. Ajayaghosh
    Protection of currency and valuable documents from counterfeit continues to be a challenge. While there are many embedded security features available for document safety, they are not immune to forgery. Fluorescence is a sensitive property, which responds to external stimuli such as solvent polarity, temperature or [...]

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    Fluorescence imaging assisted photodynamic therapy using photosensitizer linked gold quantum clusters

    Lakshmi V. Nair, Shaiju S. Nazeer, Ramapurath S. Jayasree, and Ayyappanpillai Ajayaghosh
    Fluorescence imaging assisted photodynamic therapy (PDT) is a viable two-in-one clinical tool for cancer treatment and follow-up. While the surface plasmon effect of gold nanorods and nanoparticles has been effective for cancer therapy, their emission properties when compared to gold nanoclusters are weak for [...]

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    Electrostatically driven self assembly of CdTe nanoparticles with organic chromophores probed via Ham effect

    ArunGopi, AsarikalVindhyasarumi and KaruvathYoosaf*
    We demonstrate that the polarity influence on the pyrene fluorescence band ratios (I3/I1) termed as the Ham effect can be effectively utilized to study the electrostatic interaction of CdTe nanoparticles (ζ = −46 mV) with the oppositely charged organic molecule, pyrenemethylamine hydrochloride (PMAH). As compared to water, the less [...]

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    Polypropylene / Layered double hydroxide (LDH) nanocomposites: Influence of LDH particle size on the crystallization behavior of polypropylene

    Baku Nagendra, Kiran Mohan, and E. Bhoje Gowd*
    Highly dispersed isotactic polypropylene (iPP) nanocomposites were prepared by incorporating two different sized Mg−Al LDH nanoparticles with different loadings from 1 to 10 wt % using a modified solvent mixing method. Larger sized LDH nanoparticles (∼3−4 μm) were prepared from the gel form of Mg−Al LDH, and the [...]

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    p/n-Polarity of thiophene oligomers in photovoltaic cells: Role of molecular vs supramolecular properties

    TanwisthaGhosh, AneshGopal, Akinori Saeki,* Shu Seki and Vijayakumar C. Nair*
    Molecular and supramolecular properties play key roles on the optoelectronic properties and photovoltaic performances of organic materials. In this work, we show how a small change in the molecular structure affects such properties, which in turn control the intrinsic and fundamental property such as the p/n-polarity [...]

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    Organic Donor–Acceptor Assemblies form Coaxial p–n Heterojunctions with High Photoconductivity

    Seelam Prasanthkumar, Samrat Ghosh, Vijayakumar C. Nair, Akinori Saeki, Shu Seki, and Ayyappanpillai Ajayaghosh
    The formation of coaxial p–n heterojunctions by mesoscale alignment of self-sorted donor and acceptor molecules, important to achieve high photocurrent generation in organic semiconductor-based assemblies, remains a challenging topic. Herein, we show that mixing a p-type p gelator (TTV) with an n-type [...]

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    Self-Assembled Near-Infrared Dye Nanoparticles as a Selective Protein Sensor by Activation of a Dormant Fluorophore

    Palapuravan Anees, Sivaramapanicker Sreejith,and Ayyappanpillai Ajayaghosh
    Design of selective sensors for a specific analyte in blood serum,which contains a large number of proteins, small molecules, and ions, isimportant in clinical diagnostics. While metal and polymeric nanoparticleconjugates have been used as sensors, small molecular assemblies have rarelybeen exploited for the selective sensing of a protein in blood [...]

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    New insight of squaraine-based biocompatible surface enhanced Raman scattering nanotag for cancer-cell imaging

    Development of highly sensitive diagnostic nanoprobe for cancer imaging based on surface enhanced Raman scattering (SERS) platform. SERS nanotag Au-LSL-PEG showed significant signal intensity and remarkable stability. Anti- EGF and anti-Her2 antibody are conjugated to Au-LSL-PEG-nanotag which has been successfully applied for selective recognition of cancer cells viz., A549, OSCC and MCF7.The newly developed SERS-nanotag [...]

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