Ionenaustausch

Ohne Zusammenfassung     

Die Bestimmung von Aluminium und Kupfer in Zinkspritzgu?legierungen

Ohne Zusammenfassung     

Zur Bestimmung von Nebenbestandteilen in Pyrrhotin

Ohne Zusammenfassung     

Die photometrische Bestimmung des Titans

Analytical and Bioanalytical Chemistry -     

Influence of amorphization on the local environment and heat capacity of RNi<Subscript>5</Subscript> compound (<Emphasis Type="Italic">R</Emphasis> = La,Pr)

Heat capacity measurements of amorphous and crystallized R_16.7Ni_83.3 (RNi₅) samples (RNi₅) (R = La, Pr) in magnetic fields were performed, along with measurements of the average interatomic Ni–Ni distances and average square deviations from the interatomic distances. Changes were observed in the interatomic distances in La_16.7Ni_83.3, and in the electron component of the Pr_16.7Ni_83.3 heat capacity.     

Effective method for preparation of oxide-free Ge2Sb2Te5 surface: An X-ray photoelectron spectroscopy study

Cleaning the surfaces of the as-deposited Ge₂Sb₂Te₅ was studied by X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM) and X-ray diffraction (XRD). The mixed native oxides on the as-deposited Ge₂Sb₂Te₅ surface can be easily removed by dipping Ge₂Sb₂Te₅ in de-ionized water for 1 min, while the surface morphology remains unchanged after cleaning. Native oxides only re-grow after exposure to air for more than 4 min. Although dipping in water leads to a surface layer deficient in Ge and Sb, the surface composition of Ge₂Sb₂Te₅ can recover to its stoichiometric value after annealing at 200 °C in vacuum. The phase remains amorphous at room temperature after dipping in water, and changes to fcc and hcp after annealing at 100 and 220 °C, respectively.     

Deformation and annealing behavior. II. Thick polyethylene terephthalate films

Thick (5-30 mil) samples of polyethylene terephthalate (PET), drawn uniaxially and biaxially followed by thermal crystallization, were studied by replication electron microscopy and wide- and small-angle X-rays. Deformation of gold-decorated samples indicated that aggregates on the 200–500 Å scale move as units during deformation. Thermal crystallization of both uniaxially and biaxially drawn samples occurred with the formation of coarse 200–500 Å nodular aggregates, which, in turn, may consist of the 75–100 Å nodules observed by Yeh and Geil. At annealing temperatures above 180° C, fibrillar lamellae are formed, arranged perpendicular to the draw direction in uniaxially drawn samples and at random in biaxially drawn samples. Small-angle photographs and pole figures of uniaxially drawn and annealed samples can be explained in terms of a toroidal arrangement of poles centered about the draw direction.     

2,5-Diamino-5,5-diphosphonovaleric Acid as a Ligand for an Osteotropic <Superscript>188</Superscript>Re Radiopharmaceutical

A modified method for the preparation of 2,5-diamino-5,5-diphosphonovaleric acid (DADP5) has been developed in the search for new synthetically available organic ligands to produce ¹⁸⁸Re radiopharmaceuticals with an increased accumulation in the bone tissue. Interaction of the obtained acid with ¹⁸⁸Re was studied by radio-TLC. An optimal system for separating unbound ¹⁸⁸Re and labeled complex in a yield of at least 95% was found. The biological distribution of ¹⁸⁸Re-DADP5 was studied based on direct radiometric data. The osteotropicity of ¹⁸⁸Re-DADP5 and its increased accumulation in bone fracture sites, which represent oncological pathology models, was detected at a level comparable to known radiopharmaceuticals.