1,720,964 research outputs found
Xanthan and κ-carrageenan based alkaline hydrogels as electrolytes for Al/air batteries
No full textXanthan and κ-carrageenan were used to prepare alkaline hydrogels to be used as electrolytes in aluminium air primary batteries. Two pasty gels were obtained starting from xanthan and KOH solutions (1 M and 8 M), while only the 8 M KOH solution permitted the formation of a stable, elastic and gumminess hydrogel with κ-carrageenan. Discharge tests, performed on three Al/air cells assembled with Al anodes, electrolyte gels and Pt based cathodes, evidenced that all hydrogels exhibited appreciable properties of Al ion conductivities, according to the following performance order: xanthan with KOH 1 M < xanthan with KOH 8 M < κ-carrageenan KOH 8 M. Characterization measurements (XRD, Ionic conductivity by EIS, SEM-EDS) were effected on hydrogels and galvanic cells to explain the behaviour differences detected between the hydrogels
Dissociative electron impact ionization of methyl tert-butyl ether: total cross-section and kinetic energy distributions
No full textChirality and Intermolecular Forces: Studies using R2PI Experiments in Supersonic Beams
No full textOne- and 2-color, mass-selected resonant 2-photon ionization (R2PI) spectra of the S1 S0 transitions in the bare (R)-(+)-1-PhCHMeOH (ER) and its complexes with a solvent mol. [solv: (S)-(+)-butan-2-ol (BS), (R)-(-)butan-2-ol (BR), or water (W)] were recorded after a supersonic mol.-beam expansion. The excitation spectrum of bare ER conforms to theor. predictions at the B3LYP/6-31G** level of theory by pointing to the formation of a single conformer. The 1-color R2PI excitation spectra of the diastereomeric complexes [ER-solv] (solv: BS or BR) are characterized by significant shifts of their band origin relative to that of bare ER. The extent and direction of these spectral shifts depend upon the structure and configuration of solv and are attributed to different short-range interactions in the ground and excited [ER-solv] complexes. By analogy with strictly related diastereomeric complexes, the phenomenol. binding energy of the homochiral [ER-BR] exceeds that of the heterochiral one [ER-BS]. The 1-color R2PI excitation spectra of the [ER-W] complex displays 2 signals blue shifted by 54 and 73 cm-1, relative to the S1 S0 band origin of bare ER, which indicate the presence of a O-H.pi. electrostatic interaction between ER and W
Energetics of monohydrated chiral R(+)-1-phenyl-1-propanol: supersonic beam experiments and density functional calculations
No full textIsolated hydrated clusters of the title compd. were studied in a supersonic mol. beam by means of 1- and 2-color resonant 2-photon ionization mass-resolved spectroscopy. Excitation and threshold-ionization spectra were detd. for monohydrated clusters together with the electronic ground-state binding energy. Cluster spectra were analyzed by ab initio MO calcns. at the B3LYP/6-31G** level of the theory. The anal. gives information on the cluster structures and the binding energies
Preparation of the group III nitride thin films AlN, GaN, InN by direct and reactive pulsed laser ablation.
No full textReactive pulsed laser ablation and deposition of thin indium tin oxide films for solid state compact sensors.
No full text
- …
