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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Electroless Deposition of Palladium on Macroscopic 3D-Printed Polymers with Dense Microlattice Architectures for Development of Multifunctional Composite Materials
A simple procedure has been developed to create palladium (Pd) films on the surface of several common polymers used in commercial fused deposition modeling (FDM) and stereolithography (SLA) based three-dimensional (3D) printing by an electroless deposition process. The procedure can be performed at room temperature, with equipment less expensive than many 3D printers, and occurs rapidly enough to achieve full coverage of the film within a few minutes. 3D substrates composed of dense logpile or cubic lattices with part sizes in the mm to cm range, and feature sizes as small as 150 μm were designed and printed using commercially available 3D printers. The deposition procedure was successfully adapted to show full coverage in the lattice substrates. As a result, the ability to design, print, and metallize highly ordered three-dimensional microscale structures could accelerate development of a range of optimized chemical and mechanical engineering systems.
Multifunctional cellulase catalysis targeted by fusion to different carbohydrate-binding modules
Not Available
New multifunctional tungsten nitride with energetic N 6 and extreme hardness predicted from first principles
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Multifunctional optical correlator for picosecond ultraviolet laser pulse measurement
A compact optical correlator system that measures both the autocorrelation between two infrared (IR) lights and the cross-correlation between an IR and an ultraviolet (UV) light using a single nonlinear optical crystal has been designed and experimentally demonstrated. The rapid scanning of optical delay line, switching between auto and cross-correlations, crystal angle tuning, and data acquisition and processing are all computer controlled. Pulse widths of an IR light from a mode-locked laser are measured by the correlator and the results are compared with a direct measurement using a high-speed photodetector system. The correlator has been used to study the parameter dependence of the pulse width of a macropulse UV laser designed for laser-assisted hydrogen ion (H-) beam stripping for the Spallation Neutron Source at Oak Ridge National Laboratory.
The TPR domain of PgaA is a multifunctional scaffold that binds PNAG and modulates PgaB-dependent polymer processing
The synthesis of exopolysaccharides as biofilm matrix components by pathogens is a crucial factor for chronic infections and antibiotic resistance. Many periplasmic proteins involved in polymer processing and secretion in Gram-negative synthase dependent exopolysaccharide biosynthetic systems have been individually characterized. The operons responsible for the production of PNAG, alginate, cellulose and the Pel polysaccharide each contain a gene that encodes an outer membrane associated tetratricopeptide repeat (TPR) domain containing protein. While the TPR domain has been shown to bind other periplasmic proteins, the functional consequences of these interactions for the polymer remain poorly understood. Herein, we show that the C-terminal TPR region of PgaA interacts with the de-N-acetylase domain of PgaB, and increases its deacetylase activity. Additionally, we found that when the two proteins form a complex, the glycoside hydrolase activity of PgaB is also increased. To better understand structure-function relationships we determined the crystal structure of a stable TPR module, which has a conserved groove formed by three repeat motifs. Tryptophan quenching, mass spectrometry analysis and molecular dynamics simulation studies suggest that the crystallized TPR module can bind PNAG/dPNAG via its electronegative groove on the concave surface, and potentially guide the polymer through the periplasm towards the porin for export. Our results suggest a scaffolding role for the TPR domain that combines PNAG/dPNAG translocation with the modulation of its chemical structure by PgaB.
Control of Octahedral Connectivity in Perovskite Oxide Heterostructures: An Emerging Route to Multifunctional Materials Discovery
Abstract not provided
Multifunctional Nanowire/film Composites based Bi-modular Sensors for In-situ and Real-time High Temperature Gas Detection
This final report to the Department of Energy/National Energy Technology Laboratory for DE-FE0000870 covers the period from 2009 to June, 2013 and summarizes the main research accomplishments, which can be divided in sensing materials innovation, bimodular sensor demonstration, and new understanding and discoveries. As a matter of fact, we have successfully completed all the project tasks in June 1, 2013, and presented the final project review presentation on the 9th of July, 2013. Specifically, the major accomplishments achieved in this project include: 1) Successful development of a new class of high temperature stable gas sensor nanomaterials based on composite nano-array strategy in a 3D or 2D fashion using metal oxides and perovskite nanostructures. 2) Successful demonstration of bimodular nanosensors using 2D nanofibrous film and 3D composite nanowire arrays using electrical resistance mode and electrochemical electromotive force mode. 3) Series of new discoveries and understandings based on the new composite nanostructure platform toward enhancing nanosensor performance in terms of stability, selectivity, sensitivity and mass flux sensing. In this report, we highlight some results toward these accomplishments.
Multifunctional Integrated Sensors (MFISES)
Many emerging IoT applications require sensing of multiple physical and environmental parameters for: completeness of information, measurement validation, unexpected demands, improved performance. For example, a typical outdoor weather station measures temperature, humidity, barometric pressure, light intensity, rainfall, wind speed and direction. Existing sensor technologies do not directly address the demand for cost, size, and power reduction in multi-paramater sensing applications. Industry sensor manufacturers have developed integrated sensor systems for inertial measurements that combine accelerometers, gyroscopes, and magnetometers, but do not address environmental sensing functionality. In existing research literature, a technology gap exists between the functionality of MEMS sensors and the real world applications of the sensors systems.
Multifunctional cement for geothermal wells
This report compiles the work of BNL in support of Thermal Shock Resistant Cement evaluations (TSRC) by Schlumberger. BNL has worked on the formulation of thermal-shock resistant cement since 2011. All the materials on the blend including publications and presentations are in public domain and were sent to Schlumberger for review prior the beginning of the evaluations. Initial efforts focused on achieving long and controlled thickening time of TSRC at 85°C in thickening time tests in a pressurized consistometer. Since the results of BNL set control were not reproduced by Schlumberger technical feedback on Schlumberger testing was among the main efforts of the BNL team in the beginning of the collaboration. When it became clear that the main reason of results deviation was the difference in the mode of retarder addition (dry-blended at BNL and pre-dissolved at Schlumberger) the efforts shifted to the possible decrease in the cost of the formulation by changing concentrations and nature of the alkali activator as well as evaluating performance of more economical formulations with calcium-aluminate cement, Secar #51, Secar #71 and Ciment Fondu, suggested by Schlumberger based on communications with Kerneos (supplier of calcium aluminate cements). Another piece of information obtained by Schlumberger from Kerneos that prompted evaluations of different calcium-aluminate cements in the composition of TSRC was the fact that originally used Secar#80 contains some performance-improving additives that may interfere with the set control and rheological properties of the slurries. In summary, the report contains the following information: 1. Review of the setting behavior of TSRC slurries prepared by dry-blending TA powder or pre dissolving it in mix water in calorimetric tests at 85°C; 2. Results of evaluation of different alkali activators for improved compressive strength development and cost reduction; 3. Results of evaluation of Secar #51, 71 and cement Fondu as an alternative to Secar #80 in TSRC formulation – thermal shock tests and phases’ analyses of set cement; 4. A brief discussion of early-compressive-strength-development test conditions appropriate for geothermal wells.
Multifunctional Cement for Geothermal Wells
This report compiles the work of BNL in support of Thermal Shock Resistant Cement evaluations (TSRC) by Schlumberger. BNL has worked on the formulation of thermal-shock resistant cement since 2011. All the materials on the blend including publications and presentations are in public domain and were sent to Schlumberger for review prior the beginning of the evaluations. Initial efforts focused on achieving long and controlled thickening time of TSRC at 85°C in thickening time tests in a pressurized consistometer. Since the results of BNL set control were not reproduced by Schlumberger technical feedback on Schlumberger testing was among the main efforts of the BNL team in the beginning of the collaboration. When it became clear that the main reason of results deviation was the difference in the mode of retarder addition (dry-blended at BNL and pre-dissolved at Schlumberger) the efforts shifted to the possible decrease in the cost of the formulation by changing concentrations and nature of the alkali activator as well as evaluating performance of more economical formulations with calcium-aluminate cement, Secar #51, Secar #71 and Ciment Fondu, suggested by Schlumberger based on communications with Kerneos (supplier of calcium aluminate cements). Another piece of information obtained by Schlumberger from Kerneos that prompted evaluations of different calcium-aluminate cements in the composition of TSRC was the fact that originally used Secar#80 contains some performance-improving additives that may interfere with the set control and rheological properties of the slurries. In summary, the report contains the following information: 1. Review of the setting behavior of TSRC slurries prepared by dry-blending TA powder or pre dissolving it in mix water in calorimetric tests at 85°C; 2. Results of evaluation of different alkali activators for improved compressive strength development and cost reduction; 3. Results of evaluation of Secar #51, 71 and cement Fondu as an alternative to Secar #80 in TSRC formulation – thermal shock tests and phases’ analyses of set cement; 4. A brief discussion of early-compressive-strength-development test conditions appropriate for geothermal wells.
Metaoptics Enabled Multifunctional Imaging
Despite the fact that most microorganisms occupy two- and three-dimensional space in heterogeneous arrangements and in proximity to other microorganisms of different species, much of our current knowledge about their metabolic processes is derived from homogenizing, then analyzing, the chemical content of cultures containing a single microbial species. This project addressed this fundamental dichotomy by developing a set of optical imaging principles combining multiple new technologies. The imaging strategies developed in this project combine metaoptics structures with active in situ nanoscale control of the chemical environment and applied them to a microbial system, Myxococcus xanthus, with particular relevance to the DoE mission. The combination of metaoptical architectures and nanoscale control over the molecular environment enables: (a) precise control over the electromagnetic (EM) field at length scales smaller than the wavelength of light; (b) control of the interaction of the EM field with critical molecular systems in DOE relevant microbes; (c) control over the chemical environment – especially the presence and quantity of reactive oxygen species (ROS) that can affect redox homeostasis; and (d) the ability to ask new kinds of questions not accessible to ‘omics’ approaches or standard methods of biological imaging. These capabilities are applicable to detailed studies of metabolic pathways in microbes and to lignocellulosic biomass deconstruction. To accomplish these objectives, we pursued two over-arching technical goals: (1) the development of new metaoptics-enabled approaches to imaging and spectroscopic characterization; and (2) the development of tools to control the chemical environment of a microbial sample with nanometer-scale precision. Goal 1 was addressed through the design, fabrication, and characterization of new metasurfaces capable of super-resolution imaging through extreme confinement of the optical field. Goal 2 was addressed by controlling the redox potential on the nanoscale in microbial communities and characterizing their effect on intrinsic bacterial fluorophores which act as molecular sentinels and through characterization of soluble factors secreted by Myxococcus xanthus by confocal Raman imaging. The optical imaging/sensing approaches developed here make it possible to use these powerful new imaging and sensing modalities in metabolic studies by making it possible to visualize and track the spatial and temporal expression patterns of natural or engineered pathways in microorganisms.
Multifunctional Metamaterials for Environmental and Structural Health Sensing.
Abstract not provided.
Modular, Multifunction, Multiport and Medium Voltage Utility Scale SiC PV Inverter (Final Report)
This project is to develop and demonstrate a Modular, Multi-function, Multiport and Medium Voltage utility scale SiC solar inverter (M4 Inverter). The M4 Inverter is a next generation utility scale PV + storage inverter that can substantially reduce the levelized cost of energy (LCOE) while providing grid friendly ancillary services. Conventional utility scale solar inverters includes three parts, a megawatt rated solar inverter, a low frequency transformer (LFT) and a medium voltage switch gear. The proposed M4 Inverter directly converts the DC output of solar panels to medium voltage AC, eliminating the bulky and costly LFT. The M4 Inverter also has a DC port to interface with an additional energy storage device. This plus its bidirectional power flow capability, allows multiple functions in addition to PV maximum power tracking be achieved. These additional functionalities include but not limited to reactive power support, peak shaving, fast frequency regulation and synthetic inertia. Predicted LCOE reductions with these added functionalities, improved efficiency and longer lifetime time are more than 30% compared with the 2017 utility scale solar LCOE. A 1MVA SiC M4 Inverter was developed and tested at high power level. The project has also advanced the state of the art in controller hardware in the loop simulation capability. Power electronic innovations introduced in the M4 Inverter includes 1700V SiC MOSFET application in 1500V PV system, soft switching three-port power converters and modular converter architecture.
Epitaxial Multifunctional Oxide Heterostructures (DOE Final Technical Report)
The conducting interface that forms between the two band insulators LaAlO 3 (LAO) and SrTiO 3 (STO) continues to attract tremendous attention nearly 15 years after its discovery. Until recently, most of the work on this system has been done in samples grown in the (001) crystal orientation. More recently, interest has focused on samples grown in the (110) and (111) crystal orientations. While the underlying cubic crystal structure is the same, the lattice symmetry at the interface in each case is different, raising the possibility of different properties. In particular, the symmetry of the Ti atoms at the (111) interface is hexagonal, similar to graphene, leading to predictions of topological properties of the band structure. The major part of this proposal is devoted to exploring the properties of (111) LAO/STO interfaces and (111) (La 0.3 Sr 0.7 )(Al 0.65 Ta 0.35 )/STO (LSAT/STO) interfaces, where we have recently discovered interesting new effects.
Multifunctional Optical Outcouplers for Efficient and Stable White OLEDs (Final Technical Report)
Replacing fluorescence by phosphorescence in OLED-based solid-state lighting can realize the Department of Energy’s efficiency target of 83% Internal Quantum Efficiency (IQE). The principal challenge, however, is to fix the poor stability of phosphorescent blue OLEDs. To address this, we have fabricated novel plasmonic architectures that improve device stability by decreasing the exciton lifetime of the emitters without drastically decreasing the light extraction efficiency. We describe the impact on stability of these structures in high efficiency blue phosphorescent OLEDs. Although the benefit is appreciable, we find that targeting ‘bright’ triplets on phosphorescent emitter molecules is an incomplete solution, and that it is also necessary to stabilize ‘dark’ triplets formed in the host and blocking layers. We demonstrate substantial improvements in stability using the latter approach, and conclude with a discussion of potential approaches to managing dark triplets in OLEDs.
Environmentally Friendly Production of High-Quality and Multifunctional Carbon Quantum Dots from Coal
Researchers from the University of Wyoming and the University of Utah worked jointly to study the valorization of coal to carbon quantum dots (CQDs), a value-added product with a broad spectrum of applications. The CQDs were produced by an environmentally facile hydrothermal method, and the experimental factors influencing the properties of CQDs were investigated. We subsequently explored the applications of CQDs as co-sensitizers of dye-sensitized solar cells (DSSC) and photocatalysts of water treatment. As an outlook, techno-economic and environmental analysis studied the feasibility of mass production of CQDs.