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In colloidal suspensions of silica, particles undergo constant collisions. By controlling various parameters, the repulsive barrier can be reduced, thereby substantially increasing the number of collision-induced dimerization events. Xia and co-workers report on p. 1627 that the dimers could be arrested and then permanently fixed by introducing a small amount of fresh tetraethylorthosilicate into the colloidal suspension, with monodisperse dimer yields of up to 50 %. This yield could be increased to 80 % by centrifugation in a density gradient medium.
Oriented architectures in real biominerals and biomimetics are found to be generated from bridged nanocrystals with incorporated organic polymers in work reported by Imai and co-workers on p. 1633. The bridging structure of nanocrystals plays an important role in the formation of oriented architectures without losing the flexibility to versatile macroscopic morphogeneses. Tailoring an appropriate combination of crystals and polymers leads to the growth and simultaneous integration of nanocrystals in other systems, a potentially useful strategy for many applications that require nanocrystal engineering.
The rational design of a new series of charge-neutral Ru(II) metal complexes is reported on p. 1615 by Chi, Chou, Shu, Carty and co-workers. Ruthenium complexes with isoquinolyl ligands are utilized as dopant emitters for the fabrication of red and red-orange organic light-emitting devices. The high efficiencies and low turn-on voltages obtained using relatively inexpensive ruthenium, instead of more expensive metals, marks a significant advance in the field of organic displays.
A novel composite material for noninvasive, simultaneous sensing of temperature and oxygen is presented on p. 1536 by Wolfbeis and co-workers. The two metal-organic indicator probes are incorporated into polymer microparticles, enabling their sensitivities and selectivities to be governed. The material is suitable for contactless imaging of air pressure and temperature simultaneously, for example, in wind tunnels, in high-resolution oxygen profiling, and in a variety of (micro)biological and medical applications.
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