Magnetic characteristics and anticancer activity of a nanocomplex consisting of detonation nanodiamond and doxorubicin

On the basis of detonation nanodiamond and doxorubicin antitumor drug a nanocomplex with magnetic properties of a soft ferromagnetic has been produced by mechano-magnetochemical synthesis. The combined action of the synthesized nanocomplex and local radio-frequency hyperthermia has been shown to initiate the tendency for an increase of the growth inhibition of Walker-256 carcinosarcoma as compared to the monoeffects of the nanocomplex and officinal doxorubicin.     

Corrosion protection of Sunselect, a spectrally selective solar absorber coating, by (3-mercaptopropyl)trimethoxysilane

The formation of a protective layer from (3-mercaptopropyl)trimethoxysilane (MPTMS) on commercial Sunselect, cermet-based spectrally selective coating (Alanod, DE), was studied by non-electrochemical (infrared reflection–absorption—IR RA, X-ray photoelectron spectroscopy—XPS), electrochemical (cyclic voltammetry (CV) in the presence of a redox probe (Cd⁺²), and potentiodynamic (PD)) techniques. By simple immersion and subsequent dip coating of the Sunselect substrate in the MPTMS sol, the hydrolyzed MPTMS precursor was adsorbed on the substrate, forming a protective layer imparting corrosion stability to Sunselect in a salt spray chamber for at least 20 days, outperforming any other sol–gel coating used so far for the corrosion protection of Sunselect. This was attributed to the penetration of MPTMS into the porous cermet structure through the upper antireflective Sn-oxide layer, as shown from XPS depth profile. Detailed analysis of the hydrolysis and condensation reactions of the MPTMS precursor by ²⁹Si NMR and IR spectroscopic techniques is reported.The most important finding was the observation that the applied MPTMS layer did not affect the spectral selectivity, as inferred from the solar absorptance increase of 1% and thermal emittance increase of not more than 2%.     

Zernike expansion of separable functions of cartesian coordinates

A Zernike expansion over a circle is given for an arbitrary function of a single linear spatial coordinate. The example of a half-plane mask (Hilbert filter) is considered. The expansion can also be applied to cylindrical aberrations over a circular pupil. A product of two such series can thus be used to expand an arbitrary separable function of two Cartesian coordinates.     

Effect of particle shape and size on the shrinkage of stainless steel compacts

The effects of particle size and shape on the shrinkage of commercial 316 L stainless steel compacts are evaluated. Emphasis is placed on the effect of changes in surface area and the anisotropy in inter-particle contacts brought about by the irregular powders. The effects of fine particle addition on this anisotropy and surface area are presented and plained. An empirical relationship is derived which can be used to predict changes in the axial, radial and volume shrinkage when spherical particles are substituted into a commercial blend. The effect of spherical particle substitution on the shrinkage ratio is also discussed. It is shown how the combined effects of fine particle additions and substitutions of spherical particles for irregular particles can be used to produce a compact which exhibits a shrinkage ratio (radial to axial shrinkage) of unity.