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
A materials scientist’s dream come true
21.08.2018 | Friedrich-Alexander-Universität Erlangen-Nürnberg
Novel sensors could enable smarter textiles
17.08.2018 | University of Delaware
There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.
The low current is considered one of the biggest hurdles in the development of solid-state batteries. It is the reason why the batteries take a relatively long...
New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference
Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...
Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
17.08.2018 | Event News
08.08.2018 | Event News
27.07.2018 | Event News
21.08.2018 | Power and Electrical Engineering
21.08.2018 | Life Sciences
21.08.2018 | Medical Engineering