Organic–inorganic hybrid materials, uniting the advantages of their organic and inorganic parts, are used for a wide variety of applications. However, making a homogeneous composite material is only possible if a solvent can be found in which both components are soluble.
Materials containing the metal bismuth show high radiopacity, and thus they have potential as X-ray imaging agents for computer tomography and as X-ray contrast additives in bone and dental cements, for example, to examine how well the cements fit after they are placed in the appropriate body part by an operation.
However, a major disadvantage associated with the low solubility of these inorganic bismuth compounds is phase separation due to their incompatibility with the organic matrix. Michael Mehring at the Technical University of Chemnitz and Dirk Zahn at the Friedrich Alexander University in Erlangen-Nürnberg report the investigations of their groups on highly soluble bismuth oxido clusters in the European Journal of Inorganic Chemistry.
Water-soluble hexanuclear bismuth oxido clusters were mixed with a polyacrylate organic component, which is a dispersing agent used in phosphate-free laundry detergents, to obtain a water-soluble hybrid composite material that has the potential for being used in applications such as bone cement. The solubility of the bismuth oxido cluster ensures a good dispersity in the polymer matrix.
Molecular dynamics simulations were used to demonstrate the complexation behavior of this water-soluble bismuth oxido cluster towards polyacrylate. The cluster degenerates from an octahedral to a tetrahedral motif as polyacrylate chains are wrapped around it to form a stable structure. The melting point of the composite material is lower than that of the pure polyacrylate matrix.
It is the unusual water solubility of the bismuth oxido cluster investigated that makes possible the synthesis of this hybrid material, a water-soluble transparent solid with a narrow size distribution, which is potentially applicable as bone cement.
Author: Michael Mehring, Technische Universität Chemnitz (Germany), http://www.tu-chemnitz.de/chemie/koord/
Title: A Novel Water-Soluble Hexanuclear Bismuth Oxido Cluster – Synthesis, Structure and Complexation with Polyacrylate
European Journal of Inorganic Chemistry , 2010, No. 30, 4763–4769, Permalink to the article: http://dx.doi.org/10.1002/ejic.201000753
New design improves performance of flexible wearable electronics
23.06.2017 | North Carolina State University
Plant inspiration could lead to flexible electronics
22.06.2017 | American Chemical Society
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
28.06.2017 | Power and Electrical Engineering
28.06.2017 | Life Sciences
28.06.2017 | Awards Funding