Browsing by Author "Subramani, R"

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3D NANOMANIPULATION: DESIGN AND APPLICATIONS OF FUNCTIONAL NANOSTRUCTURED BIO-MATERIALS
(IOP Publishing Ltd, 2020) Lega, P V; Orlov, A P; Frolov, A V; Subramani, R; Irzhak, A V; Koledov, V V; Smolovich, A M; Shelyakov, A V
Recent progress in the development of the new functional materials opens up exciting possibilities for designing reconfigurable micro- and nano-structures and for operating mechanical nanotools which are controlled by external fields or heat. The nanotools such as nanotweezers with an active layer thickness of about several tenths of nm, and whose overall size is of the order of 1 μm can be applied to different micro- and nanoobjects. The present report gives an overview of the application of mechanical nanotools in 3D nanomanipulation of bio-nano objects such as micro biofibers DNA etc. The future prospects of mechanical bottom up nanomanipulation for biomedical technology, food technology are discussed.
RECENT DEVELOPMENT IN PREPARATION OF FOOD PACKAGING FILMS USING BIOPOLYMERS
(Rynnye Lyan Resources, 2021-12) Suresh, S; Pushparaj, P; Subramani, R
In the past decades, most materials used in the food packaging industry are non- biodegradable materials that pose increased environmental concerns and sustainability issues. Hence, polymer-based biodegradable materials and edible films have been developed to increase the shelf life of food products. Especially, biopolymer-based nano-materials are engineered with multifunctional characteristics because of their size, surface area, shelf life, thermal stability, and mechanical and barrier strength. These materials display enriched properties of biodegradability, antimicrobial activity, and biocompatibility and may have the possibility to replace plastic materials in future. Thus, this review offers a brief overview of the classification of biopolymers, key parameters that are important in food packaging films (including the role of plasticizers, cross-linkers, pH, temperature, and relative humidity), and recent applications of novel biopolymer nanocomposite materials used in the food industries.
THERMOELASTIC MARTENSITIC TRANSFORMATION AND SHAPE MEMORY EFFECT IN NANOPLATES BASED ON TI–NI ALLOYS: EXPERIMENT, MODELING BY DENSITY FUNCTIONAL THEORY AND MOLECULAR DYNAMICS
(Springer Link, 2022-03-01) Lega, P V; Kartsev, A I; Shuhui, Lv; Subramani, R; Koledov, V V
Nanoplates based on Ti–Ni alloys, exhibiting a thermoelastic martensitic transition at the critical temperature Tc, are investigated experimentally by transmission electron microscopy. It is shown that the Tc(h) dependence strongly decreases. There is a critical thickness hc at which the transition is completely suppressed. As a result of the combined ab initio simulation by the methods of density functional theory and molecular dynamics, it is demonstrated that austenite is more stable than martensite in nanoscale plates. The phase transition is completely suppressed in a 10-nm-thick plate, which is in good agreement with the experimental value of hc. In a transmission electron microscope during heating and cooling, the reversible shape memory effect in composite amorphous-crystalline Ti2NiCu samples is for the first time demonstrated while simultaneously observing the evolution of the structure of martensitic twins and the shape. The studies are carried out on ultrathin wedge-shaped samples with a thickness of 200 to 30 nm, made in the form of a composite bimetallic nanoactuator.