The Federal Institute for Materials Research and Testing is a German material research institute. Wikipedia.
Wurth C.,BAM Federal Institute of Materials Research and Testing
Nature protocols | Year: 2013
Luminescence techniques are among the most widely used detection methods in the life and material sciences. At the core of these methods is an ever-increasing variety of fluorescent reporters (i.e., simple dyes, fluorescent labels, probes, sensors and switches) from different fluorophore classes ranging from small organic dyes and metal ion complexes, quantum dots and upconversion nanocrystals to differently sized fluorophore-doped or fluorophore-labeled polymeric particles. A key parameter for fluorophore comparison is the fluorescence quantum yield (Φf), which is the direct measure for the efficiency of the conversion of absorbed light into emitted light. In this protocol, we describe procedures for relative and absolute determinations of Φf values of fluorophores in transparent solution using optical methods, and we address typical sources of uncertainty and fluorophore class-specific challenges. For relative determinations of Φf, the sample is analyzed using a conventional fluorescence spectrometer. For absolute determinations of Φf, a calibrated stand-alone integrating sphere setup is used. To reduce standard-related uncertainties for relative measurements, we introduce a series of eight candidate quantum yield standards for the wavelength region of ∼350-950 nm, which we have assessed with commercial and custom-designed instrumentation. With these protocols and standards, uncertainties of 5-10% can be achieved within 2 h. Source
Friedrich J.,BAM Federal Institute of Materials Research and Testing
Plasma Processes and Polymers | Year: 2011
Several reaction mechanisms have been proposed for the formation of plasma polymers, such as monomer fragmentation followed by poly-recombination into randomly structured and crosslinked films; fragmentation, accompanied by the formation of acetylene or other film-forming intermediates and deposition of polystyrene-like material; plasma-initiation of a radical chain-growth polymerization; and ion-molecule reactions, as well as ionic chain-growth polymerization. The bulk structure of plasma polymers is completely irregular, far from that of conventional polymers. The retention of functional groups during plasma polymerization tends to be greater than that of the entire monomer structure found again as an intact repeat unit in the resulting plasma polymer. An alternative method for depositing ultra-thin, pin-hole free coatings, ones that possess regular structures, is by electrospray ionization (ESI) of pre-fabricated polymers. © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source
Kyb Co., BAM Federal Institute of Materials Research and Testing | Date: 2014-02-12
Problems to be solved: To provide a sliding member capable of achieving low friction properties and low wearing properties under dry conditions (i.e., in the absence of a lubricant). Solution: A sliding member including: a sliding-element
BAM Federal Institute of Materials Research and Testing | Date: 2010-08-26
BAM Federal Institute of Materials Research, Testing and Bayer Intellectual Property GmbH | Date: 2012-04-05
A device comprising a planar material and at least one support element which is connected to the planar material, wherein the at least one support element comprises at least one shape memory polymer, such that the device has a substantially flat shape in a first configuration of the at least one shape-memory polymer and a substantially domed shape in a second configuration of the shape-memory polymer.