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Archita Patnaik
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Archita Patnaik
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Archita Patnaik
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Patnaik, A.
Patnaik, Archita
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- PublicationHydrogen bond directed 2D materials at modulated interfaces(01-01-2019)Realizing functionality encoded molecular architectures at defined interfaces has always been a challenging task. Controlling, disassembling, and altering H-bonds is of critical importance in the design of functional two-dimensional (2D) materials. Using H-bonding as the driving interaction, the following strategies were adopted in achieving the desired architectures: • Dimensionality dictated H-bond reorganization at the air-water interface. • Formulation of active template strategy using well defined self-assembled monolayers for inducing H-bond reorganization. • Design of multicomponent smart organic interfaces endowed with H-bond acceptors following H-bond assisted molecular recognition at the solid-liquid interface. Molecular conformation and packing restrictions in the Langmuir and self-assembled monolayers have been found to be the bottlenecks in controlling and reorganizing the H-bonds. This chapter details the diversity-driven bold design and mechanistic report, adopting both experiments and computations, on the 2D orientation-specific molecular ellipsoids conceived from a single component benzoic acid based amphiphile, drawing attention to rules centering around monomer structure, intra and intermolecular twists and the only 2D degree of freedom, the surface pressure, directing shape anisotropy during the dynamic self-assembly. The importance of chirality and recognition through chemical specificity and surface sensitive vibrational spectroscopy was used extensively as a label-free approach for investigating biomembrane behavior. Enantio-selective molecular recognition of Phenylalanine by the anisotropic 2D DPPC lipid membrane was explored. By adopting polarized FT-IRRAS spectroscopy in conjunction with static and dynamic ab initio computational studies, a molecular level understanding of the enantioselective binding of the D-enantiomer over its L-enantiomer was established. Hydration played a key role in the binding affinity, and the specificity of amino acid-lipid interaction altered the IRRAS frequency and intensity to differing degrees, enabling them to be distinguished. The work exemplified the significant role of water in mediating intermolecular amino acid-lipid interaction. Methodical access to a wide range of geometrical assembles encompassing all the dimensions of a strained structural Oxanorbornane framework at A/W interface as well as in the bulk was demonstrated. Amphiphilic oxanorbornane skeletal frame efficiently organized to direct the formation of dimensionally controllable, geometry-specific nanostructures as diverse as 0D surface/reverse micelles, 1D nanofibers, 2D rectangular/square sheets, and 3D flowers. The racemate with its precise stereo-projection of the -OH groups and the ring oxygen catered towards Li+ ion sensing and aided in the formation of pre-micellar aggregates of conventional surfactants.
- PublicationInterface configuration and adhesion in Au-polycarbonate bilayer structure: Influence of 27Al+ ion mixing(01-01-2023)
; Li, ChanglinStructural modification at the Au-Polycarbonate(PC) interface upon 100 keV 27Al+ ion implantation at a dose and beam current density 5x1016 ions.cm−2 and 30–50 nA.cm−2, respectively, was studied by X-ray Photoelectron Spectroscopy (XPS) with a Au thickness of 28.2 nm. XPS depth profiling with 3 keV Ar+ ion sputtering at 1 μA revealed the interface to be sharp covering a few monolayers. A substantial Au atomic concentration of ~5% in the bulk PC indicated the Ar+ ion assisted diffusion of the metal into the bulk. Existence of weak Au → C charge transfer interactions with Au as the electron injector distributing a net charge density at the C=O bond as the primary interaction site was deduced from the appearance of the 282.4 eV C1s feature. 27Al+ ion implantation induced interfacial mixing of the substrate C with the Au film in the bilayer target was observed with the evolution of a broad interface of ~50 nm thickness, accompanied by the formation of Au-Al, Al-O and Al-O-C bonds along with dominant graphitization of the polymer. Free carbon transport into and through the Au film to the surface resulted in a diffused interface with an abnormally low oxygen concentration throughout. Au-Al bonding was identified in the Au-rich region, and shifted to Al-O bonding in the C-rich region of the polymer, with the Al atomic concentration reaching a maximum of 1.8%. After ion-beam mixing and surface modification by ion bombardment, force curve measurements performed using Atomic Force Microscopy(AFM) showed a drastic reduction in the interface adhesion values.