Green synthesis of methyl trifluoropyruvate catalyzed by solid acids

Solid acids – NiSO₄/Al₂O₃, Fe₂(SO₄)₃/Al₂O₃ and TiO₂/SO₄²⁻ – appeared to be effective catalysts for the acid catalyzed synthesis of methyl ester of trifluoropyruvic acid. They are active at 150–180 °C.     

A study of sorption and decomposition of ozone on microfibrous filtering materials

Decomposition of ozone on commercial and pilot filtering microfibrous materials based on polymers, glass fibers, and carbonized polymeric fibers was studied. Original Russian Text A.I. Klimuk, L.A. Obvintseva, A.D. Shepelev, V.L. Kuchaev, M.P. Dmitrieva, E.N. Ushakova, A.K. Avetisov, 2008, published in Zhurnal Prikladnoi Khimii, 2008, Vol. 81, No. 4, pp. 593–597.     

Liposomal Co-Encapsulation of Two Novel Europium Complexes and Doxorubicin: Fluorescence Study

The present study was undertaken to design the novel liposomal drug formulation containing doxorubicin and europium coordination complexes. It was shown that co-encapsulation of the drugs facilitates the partitioning and permeation of lanthanides into the lipid bilayer. The obtained results suggest that new drug platform may have potential application in the design of novel antitumor agents.     

Electrolytic properties and stability of solid solutions of ytterbium sulfide in calcium thioytterbate

Solid solutions of Yb₂S₃ based on CaYb₂S₄ (Yb₃S₄) were prepared by the ceramic and sol-gel methods. The samples were identified by XRD. The electric conductivity of complex sulfide phases with different backgrounds was studied. The length of phases based on CaYb₂S₄ was determined. The thermal stability of the samples was tested and the range of working temperatures was determined.     

Synthesis, structure, and physico-chemical properties of sulfide ceramics CaY2S4-Yb2S3

Solid solutions are synthesized in the system of CaY₂S₄-Yb₂S₃. Temperature and concentration dependences of electrolytic properties are studied, the sulfide ion-based conductivity is confirmed. It is shown that the high contribution of ion conductivity in the synthesized phases is due to formation of charged vacancies. Mechanisms of defect formation are suggested.     

Stability of Optical Responses from Lead-free Perovskite Films

Optics and Spectroscopy - Materials with perovskite-type crystal structure attract much attention due to their unique optical properties, such as high quantum yield of photoluminescence and high...     

Estimates for the singular values of stieltjes type transforms

We obtain two-sided estimates for the Schatten-von Neumann norms of a selfadjoint Stieltjes type transform in the space of square integrable functions.     

Macromolecules in a blend of poor and amphiphilic solvents

The globular state of the homopolymer macromolecule in a blend composed of a poor solvent and an amphiphilic solvent (substrate), whose molecules tend to be aligned with the solvent concentration gradient in the inhomogeneity region, was theoretically studied. The size of a homogeneous globule and the substrate concentration in its volume were calculated in terms of a bulk approximation. After the transition of the macromolecule from the coil to the globule state, its volume first decreases with a decrease in temperature and then begins to grow due to substrate molecules penetrating the globule. The substrate concentration in the globule insignificantly exceeds that outside the globule at identical second virial coefficients of interaction between monomer units and between substrate molecules. The expression for the free energy functional depending on the volume fractions of the components and on the orientation of substrate molecules was examined in the ground-state approximation. The orientation effect leads to narrowing of the surface layer and to a decrease in the surface tension of the homogeneous globule, thereby increasing its stability with respect to the transition to the unfolded-coil state.