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Title: Final Scientific Report - Electromagnetic Interactions in Self-Assembled Metallo-Dielectric Biomaterials

Abstract

Achievements which resulted from previous DOE funding include: templated virus-like particle assembly thermodynamics, development of single particle photothermal absorption spectroscopy and dark- field spectroscopy instrumentation for the measurement of optical properties of virus-like nanoparticles, electromagnetic simulations of coupled nanoparticle cluster systems, virus contact mechanics, energy transfer and fluorescence quenching in multichromophore systems supported on biomolecular templates, and photo physical work on virus-aptamer systems. A current total of eight published research articles and a book chapter are acknowledging DOE support for the period 2013-2016.

Authors:
 [1]
  1. Indiana Univ., Bloomington, IN (United States)
Publication Date:
Research Org.:
Indiana Univ., Bloomington, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1354823
Report Number(s):
DOE-IU-SC0010507
DOE Contract Number:
SC0010507
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 77 NANOSCIENCE AND NANOTECHNOLOGY

Citation Formats

Dragnea, Bogdan G. Final Scientific Report - Electromagnetic Interactions in Self-Assembled Metallo-Dielectric Biomaterials. United States: N. p., 2017. Web. doi:10.2172/1354823.
Dragnea, Bogdan G. Final Scientific Report - Electromagnetic Interactions in Self-Assembled Metallo-Dielectric Biomaterials. United States. doi:10.2172/1354823.
Dragnea, Bogdan G. Wed . "Final Scientific Report - Electromagnetic Interactions in Self-Assembled Metallo-Dielectric Biomaterials". United States. doi:10.2172/1354823. https://www.osti.gov/servlets/purl/1354823.
@article{osti_1354823,
title = {Final Scientific Report - Electromagnetic Interactions in Self-Assembled Metallo-Dielectric Biomaterials},
author = {Dragnea, Bogdan G.},
abstractNote = {Achievements which resulted from previous DOE funding include: templated virus-like particle assembly thermodynamics, development of single particle photothermal absorption spectroscopy and dark- field spectroscopy instrumentation for the measurement of optical properties of virus-like nanoparticles, electromagnetic simulations of coupled nanoparticle cluster systems, virus contact mechanics, energy transfer and fluorescence quenching in multichromophore systems supported on biomolecular templates, and photo physical work on virus-aptamer systems. A current total of eight published research articles and a book chapter are acknowledging DOE support for the period 2013-2016.},
doi = {10.2172/1354823},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed May 03 00:00:00 EDT 2017},
month = {Wed May 03 00:00:00 EDT 2017}
}

Technical Report:

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  • Existing formulas for bremsstrahlung cross- sections for charged particles precipitating into the lower ionosphere at high latitudes have been corrected to include the dependence on angle in the photo-ionization by bremsstrahlung photons. The study of polarization of bremsstrahlung x- rays in the lower ionosphere disclosed that the polarization parameters vary with height and are energy dependent so that precision measurement of x-ray polarization could be used for diagnostic purposes. It was found that the effect of an electric field along field lines on whistler-mode waves results in unducting of the wave. For processes in the equatorial electrojet it was concludedmore » that the two-stream instability criteria are not satisfied during the westward current flow and magnetic-field depressions are correlated with the disappearance of equatorial sporadic- E traces on ionograms. A secondary peak in intensity distribution of synchrotron radiation from a weakly- relativistic electron plasma is interpreted as being due to scattering of radiation by plasma inhomogeneities. (auth)« less
  • This project set out to scientifically-tailor ''smart'' interfacial films and 3-D composite nanostructures to exhibit photochromic responses to specific, highly-localized chemical and/or mechanical stimuli, and to integrate them into optical microsystems. The project involved the design of functionalized chromophoric self-assembled materials that possessed intense and environmentally-sensitive optical properties (absorbance, fluorescence) enabling their use as detectors of specific stimuli and transducers when interfaced with optical probes. The conjugated polymer polydiacetylene (PDA) proved to be the most promising material in many respects, although it had some drawbacks concerning reversibility. Throughout his work we used multi-task scanning probes (AFM, NSOM), offering simultaneous opticalmore » and interfacial force capabilities, to actuate and characterize the PDA with localized and specific interactions for detailed characterization of physical mechanisms and parameters. In addition to forming high quality mono-, bi-, and tri-layers of PDA via Langmuir-Blodgett deposition, we were successful in using the diacetylene monomer precursor as a surfactant that directed the self-assembly of an ordered, mesostructured inorganic host matrix. Remarkably, the diacetylene was polymerized in the matrix, thus providing a PDA-silica composite. The inorganic matrix serves as a perm-selective barrier to chemical and biological agents and provides structural support for improved material durability in microsystems. Our original goal was to use the composite films as a direct interface with microscale devices as optical elements (e.g., intracavity mirrors, diffraction gratings), taking advantage of the very high sensitivity of device performance to real-time dielectric changes in the films. However, our optical physics colleagues (M. Crawford and S. Kemme) were unsuccessful in these efforts, mainly due to the poor optical quality of the composite films.« less
  • Alternative solutions are desired for mid-wavelength and long-wavelength infrared radiation detection and imaging arrays. We have investigated quantum dot infrared photodetectors (QDIPs) as a possible solution for long-wavelength infrared (8 to 12 {mu}m) radiation sensing. This document provides a summary for work done under the LDRD 'Infrared Detection and Power Generation Using Self-Assembled Quantum Dots'. Under this LDRD, we have developed QDIP sensors and made efforts to improve these devices. While the sensors fabricated show good responsivity at 80 K, their detectivity is limited by high noise current. Following efforts concentrated on how to reduce or eliminate this problem, butmore » with no clear path was identified to the desired performance improvements.« less
  • Laboratory observations were made of electromagnetic scattering from low pressure, low current dc discharges to test the assertion that the low-frequency ion-acoustic waves can be observed and used for the simulation of naturally occurring instabilities. An analysis of the experimental parameters and circum-, stances shows that such waves should be obserwable, provided it is permissible to ignore the effect of collisions. Observations of the backscatter signal at X- band from nttrogen and helium discharges indicate thrt this is, indeed, the case. Large enhancements in the scattering cross sections, relative to the Thomson level, are observed as well as the Dopplermore » spread and lines. The interpretation of the latter is generally consistent with the model of ion-acoustic waves being viewed by an uncollimated antenna. (auth)« less