No abstract

No abstract

No abstract

Abstract:The amount of data being generated in the nanotechnology research space is significant, and the coordination, sharing, and downstream analysis of the data is complex and consistently deliberated. The complexities of the data are due in large part to the inherently complicated characteristics of nanomaterials. Also, testing protocols and assays used for nanomaterials are diverse and lacking standardization. The Nanomaterial Registry has been developed to address such challenges as the need for standard methods, data formatting, and controlled vocabularies for data sharing. The Registry is an authoritative, web-based tool whose purpose is to simplify the community's level of effort in assessing nanomaterial data from environmental and biological interaction studies. Because the Registry is meant to be an authoritative resource, all data-driven content is systematically archived and reviewed by subject-matter experts. To support and advance nanomaterial research, a set of minimal information about nanomaterials (MIAN) has been developed and is foundational to the Registry data model. The MIAN has been used to create evaluation and similarity criteria for nanomaterials that are curated into the Registry. The Registry is a publicly available resource that is being built through collaborations with many stakeholder groups in the nanotechnology community, including industry, regulatory, government, and academia. Features of the Registry website (http://www.nanomaterialregistry. org) currently include search, browse, side-by-side comparison of nanomaterials, compliance ratings based on the quality and quantity of data, and the ability to search for similar nanomaterials within the Registry. This paper is a modification and extension of a proceedings paper for the Institute of Electrical and Electronics Engineers.

Figure 13. Typical spectral radiant flux obtained using the PLN technology. This light source was a neutral white color. Figure 12. Through a judicious choice of nanofiber properties and luminescent particle coatings, virtually any point on the chromaticity axis can be produced. In this example, a blue (450 nm) LED is used to pump green and red PLNs to produce various colors. Figure 2. SEM images of (A) smooth PMMA nanofibers and (B) porous PMMA nanofibers produced through electrospinning.A BAs the solution flows to the electrode, the high electric field deforms each drop of the polymer solution into a conical shape known as a Taylor cone. Above a threshold limit, the electrical forces overcome the surface tension of the solution, and a fine, charged jet is ejected from the electrode and ultimately deposits nanofibers on a grounded substrate.In SSL applications, we have found that nanofiber mats serve the following functions:Provide optical filtering of the pump radiation ElectrospinningPolymer nanofibers are macro-sized objects with nanoscale features. The length (>> microns) of the nanofibers imparts macro-scale properties, while their diameter (50 nm-500 nm) imparts nanomaterial behavior. In addition, other nanoscale features such as surface pores or nanoparticles (e.g., luminescent quantum dots [QDs]) can be incorporated into the nanofiber to provide special physical and optical properties.Nanofibers are typically formed using the process of electro spinning, which involves applying a high voltage to an electrode in contact with a reservoir of polymer solution. The quantum dots used in the spray coating solution have the following properties:The QD consists of a semiconducting CdSe core that absorbs short wavelengths and emits longer • wavelengths. The emission color depends on the size of this core.A ZnS shell surrounds the core and provides environmental stability. • A long-chain amine coordination sphere is attached to the ZnS shell to provide compatibility • with various solvents and polymers. AbstractPhotoluminescent nanofibers (PLNs) can be formed by combining electrospun polymeric nanofibers and luminescent particles such as quantum dots (QDs). The physical properties of PLNs are dependent upon many different nanoscale parameters associated with the nanofiber, the luminescent particles, and their interactions. By understanding and manipulating these properties, the performance of the resulting optical structure can be tailored for desired end-use applications. For example, the quantum efficiency of QDs in the PLN structure depends upon multiple parameters including QD chemistry, the method of forming the PLN nanocomposites, and preventing agglomeration of the QD particles. This is especially important in solution-based electrospinning environments where some common solvents may have a detrimental effect on the performance of the PLN. With the proper control of these parameters, high quantum efficiencies can be readily obtained for PLNs. Achieving high quantum efficiencies is critical in applicatio...