Indian Institute of Technology Madras

Indian Institute of Technology Madras (iit Madras)

Pradeep Thalappil

Swathy Jakka Ravindran

Srikrishnarka Pillalamarri

Avijit Baidya

Sreeprasad Theruvakkattil Sreenivasan

Shibu Sidharth Edakkattuparambil

Shihabudheen Mundampra Maliyekkal

Mohd Azhardin Ganayee

Depanjan Sarkar

Anirban Som

Panikkanvalappil Ravindranathan Sajanlal

Biswajit Mondal

Ankit Nagar

Ramesh Kumar

Md Rabiul Islam

Soujit Sengupta

Sourav Kanti Jana

Sajanlal Panikkanvalappil Ravindranathan

Jakka Ravindran Swathy

Ammu Mathew

Udayabhaskararao Thumu

Chandramouli Subramaniam

Reduced graphene oxide@polystyrene (RGO-PS) composite was synthesized using reduced graphene oxide (RGO), styrene monomer and divinylbenzene through an in-situ polymerization process. The RGO-PS composite was functionalized with sulfonate and quaternary amine functionalities for making positive and negative integrated electro-adsorbent-ion exchange resins (EAIERs), respectively. These EAIERs 'molecular constructs' were used as CDI electrodes and desalination was performed for the removal of different ions. A high electro-adsorption capacity of ˜15.93 mg/g for Clusing 802 μS NaCl solution was observed in laboratory batch experiments which was much higher than the adsorption capacity of RGO electrodes reported earlier (˜2-3 mg/g).

Integrated CDI electrode

The present invention relates to a durable and multifunctional superhydrophobic coating composition and water based fabrication method of producing the durable and multifunctional superhydrophobic coating composition via chemical modification and functionalization of hydrophilic material by silanes under room temperature without any organic solvents. Synthesis of chemically modified cellulose nanofibers or clay in water forms excellent water repelling thin films upon coating over various substrates. The super hydrophobic materials are used as additive for paints, pigments, paper, varnish and, textile and used for various industrial applications such as construction of buildings and other super structures.

Aqueous composition and a method of producing durable and extremely efficient water repelling superhydrophobic materials at ambient condition thereof

The present invention relates to a method of enhancing heat transfer of metallic surfaces by (1) fabricating hierarchical micro-nanostructured surfaces using etching processes, and (2) fabricating hydrophobic and hydrophilic regions, using a printing or a coating technique, followed by etching. The said method enhances the density of condensation sites over a metallic surface and additionally facilitates the departure of condensed droplets from the surface. Such a surface also enhances the sensible heat transfer characteristics, and improves the coefficient of performance (COP) of refrigeration systems for applications like atmospheric water generators, dehumidifiers, air conditioners, etc.

Modified surface for condensation

The present invention relates to a new method for creating nanopores in single layer molybdenum disulfide (MoS) nanosheets (NSs) by the electrospray deposition (ESD) of silver ions on a water suspension of the former. Electrospray deposited silver ions react with the MoSNSs at the liquid-air interface resulting in AgS nanoparticles (NPs) which goes into the solution leaving the NSs with holes of 3-5 nm diameter. Specific reaction with the S of MoSNSs leads to Mo-rich edges. Such Mo-rich defects are highly efficient for the generation of active oxygen species such as HO, under visible light, which causes efficient disinfection of water. The holey MoSNSs shows 10times higher efficiency in disinfection compared to normal MoSNSs. Developed a conceptual prototype and tested with multiple bacterial strains and a viral strain, demonstrating the utility of the method for practical applications.

Method for creating nanopores in MOSnanosheets by chemical drilling for disinfection of water under visible light

The present invention relates to adurable and multifunctional superhydrophobic coating composition and water based fabrication method of producing the durable and multifunctional superhydrophobic coating composition via chemical modification and functionalization of hydrophilic material by silanes under room temperature without any organic solvents. Synthesis of chemically modified cellulose nanofibers or clay in water forms excellent water repelling thin films upon coating over various substrates. The super hydrophobic materials are used as additive for paints, pigments, paper, varnish and, textile and used for various industrial applications such as construction of buildings and other super structures.

A luminescent nanocomposite comprising functionalized graphene and a luminescent moiety, its fabrication, and uses are described. The luminescent moiety is anchored non-covalently to the functionalized graphene. Luminescence properties of the nanocomposite may be modulated by choosing appropriate luminescent moieties such as native lactoferrin, native lactoferrin protected gold clusters, and so forth. Mechanical properties of the nanocomposite may be modulated by adding a biopolymer such as Chitosan. The nanocomposite may be used as a luminescent ink for encoding information, or a luminescent film for tagging articles of manufacture such as electronic waste components.

Luminescent graphene patterns

Coated mesoflower are described including: a metallic mesoflower core having a first surface and including at least one protrusion terminating in a tip; a non-metallic coating covering and substantially conformal to the first surface, thereby creating an outer surface of the coated mesoflower; and a marker material having an optical property that is enhanced in the presence of the coated mesoflower. Coated hollow mesoflowers that do not have the metallic mesoflower core are also described.

Coated mesoflowers for molecular detection and smart barcode materials

Composite materials comprising a mesoflower structure, methods of preparing the composite material, and methods of detecting heavy metal ion using the composite material are described herein. In some embodiments, a silica-coated gold mesoflower with a layer of silver quantum clusters may be capable of detecting Hgions in a sample at zeptomolar concentrations.

Visual detection of mercury ions

A composition includes a quantum cluster of Agor Au, one or more protector molecules; and a molecular cavity partially or wholly surrounding the quantum cluster. A method for preparing the quantum clusters includes adding a first amount of glutathione to a gold salt, a silver salt, or a mixture thereof to form a mixture; adding a reducing agent to the mixture to form a precipitate; and mixing the precipitate with a second amount of glutathione and a cyclodextrin to form a composition. Devices are prepared from the quantum clusters, and the devices may be used in methods of authentication of articles.

Gold and silver quantum clusters in molecular containers and methods for their preparation and use

Methods for the synthesis of metal quantum clusters within the framework of a porous gel matrix are described. For example, Ag(glutathione)quantum clusters are synthesized in a cross-linked polyacrylamide gel matrix. The methods can be performed on large-scale and yields monodispersed metal quantum clusters. 

Methods of preparing metal quantum clusters in molecular confinement

A composition includes a quantum cluster of Agor Au, one or more protector molecules; and a molecular cavity partially or wholly surrounding the quantum cluster. A method for preparing the quantum clusters includes adding a first amount of glutathione to a gold salt, a silver salt, or a mixture thereof to form a mixture; adding a reducing agent to the mixture to form a precipitate; and mixing the precipitate with a second amount of glutathione and a cyclodextrin to form a composition. Devices are prepared from the quantum clusters, and the devices may be used in methods of authentification of articles.

An embodiment relates a method comprising creating a reversible change in an electrical property by adsorption of a gas by a composition, wherein the composition comprises a noble metal-containing nanoparticle and a single walled carbon nanotube. Another embodiment relates to a method comprising forming a composition comprising a noble metal-containing nanoparticle and a single walled carbon nanotube and forming a device containing the said composition. Yet another method relates to a device comprising a composition comprising a noble metal-containing nanoparticle and a single walled carbon nanotube on a silicon wafer, wherein the composition exhibits a reversible change in an electrical property by adsorption of a gas by the composition.

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Chennai, India

Pradeep Thalappil