Authors:R. Ciach, W. Kapturkiewicz, W. Wolczynski, and A. M. Zahra
A general mathematical treatment for heat-flux differential scanning calorimetry is given. It combines equations derived for heat transfer in the calorimeter cell with an approach to the solidification of metal or alloy carried out in this type of instrument. The differences are discussed between temperature evolution, kinetics of latent heat and undercooling evolution within the sample, and temperature evolution, recorded signal and measured undercooling at the monitoring station.
Authors:E. Blicharska, Ł. Komsta, R. Kocjan, A. Gumieniczek, A. Kloc, and J. Kaźmierczak
The paper discusses a possibility to grow seeds on solutions of microelements and application of sprouts enriched in such a way as an alternative to commercial dietary supplements. It contains a short review of the approaches reported till now and a systematic experimental study, carried on the most frequently used seeds (Lens culinaris, Helianthus annuus, Vigna radiata, Glycine max, and Lepidium sativum).Seven metals (Fe, Cu, Zn, Ni, Co, Cd, and Mn) were studied. Seeds were grown on cellulose in 20°C temperature using deionized water enriched with metals in concentrations: 100, 50, 25, 12.5, 6.25, and 3.125 mg/L in a period of 4 days. The reference samples were the seeds grown on pure deionized water. Sprouts were mineralized by microwave radiation, and the metal content was quantified by ion chromatography with on-line post-column derivatization and spectrophotometric detection.The conclusions can be treated as general recommendations, which seeds should be grown and what concentrations of metals in solutions should be applied to provide good enrichment and to avoid risk of microelement overdose.
Authors:Y. Inoue, O. Tochiyama, H. Yamazaki, and A. Sakurada
A model for treating the sorption of metal ions on hydrous metal oxides was established based on the assumptions that these materials are weakly acidic cation exchangers and have a discrete exchanger phase. The experimental results of the sorption of metal ions on the hydrous niobium(V) and tin(IV) oxides are found to be consistent with the formulas derived from the model by considering that the charge balance and the mass action law hold in the exchanger phase and cations are sorbed by the distribution between this phase and the bulk aqueous phase.
Authors:S. K. Mehta, Ravneet Kaur, and Sukhjinder Singh
can be created as desired. The facility to synthesize complexes with various hydrophobic chains and head group (metal ions) provides great flexibility in tailoring the amphiphiles to have specific physical architecture and chemical functionalities. It
Authors:Christian Vogel, Christian Adam, and Miriam Unger
issue as sewage sludge is often highly contaminated with organic pollutants and heavy metals. Consequently, the amount of sewage sludge thermally treated (mono- or co-incineration and subsequent disposal of the ashes) significantly increased in the last
, the binding constants of di-ionizable p - tert -butylcalixarene conformers toward dissolved alkali metal cations were determined. Nine scaffolds were used to assess the binding constants of isoconformations using ITC experiments
Treatment of uranium with hydrochloric or hydrobromic acid produces an adherent layer of hydride on the metal surface. When this hydride is decomposed by heat in a vacuum, the resulting metal surface reacts immediately with hydrogen at ambient temperature.
Authors:V. A. Logvinenko, M. P. Yutkin, M. S. Zavakhina, and V. P. Fedin
[ 1 – 3 ].
Metal–organic coordination polymer frameworks (MOFs) are a relatively new matrix type; their “empty” structures can remain after guest molecule removal. MOFs are crystalline compounds consisting of metal ions coordinated by bridging