An electrospray method is used for the conversion of isolated
molecules of atactic polystyrene
of high molar mass in solution to solid, single-molecule particles.
With this process it is possible to produce
not only single molecules but also clusters of several molecules.
Particle size and shape distributions
were characterized using scanning force and scanning electron
microscopy. The size of the clusters of
more than one molecule can be tailored to ones needs by controlling the
spray conditions.
The lateral fixing of calamitic mesogens through hydrogen bonding of facial amphiphiles is a novel way of generating smectic materials with a broad mesomorphic region. Compound 1 is an example of this amphiphile and represents a new type of liquid‐crystalline carbohydrate. R = OC10H21.
The magnetization of stabilized cobalt colloids in tetrahydrofuran has been studied by a superconducting quantum interference device (SQUID) and magnetic balance measurements in dependence of applied magnetic field and temperature. The colloids are generated by a newly developed electrochemical method which allows one to generate clusters containing about 1000 atoms with a narrow size distribution. The final size distribution of the clusters is examined by high resolution transmission electron microscopy and small angle x-ray scattering. The magnetization curves have been determined with special emphasis on changes at the freezing point of the solution. The curves of the liquid phase can be reasonably described by the Langevin function and the magnetic moments of isolated cobalt clusters that have been recently measured by Stern–Gerlach experiments. Deviations that appear at the freezing point can be understood in terms of magnetic anisotropy effects. It is shown that the cluster sizes and the susceptibilities of the dispersions are related. Therefore the growth of the clusters during the electrolysis can be directly observed by measuring the susceptibility in dependence of the charge transport in the cell.
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