1,721,290 research outputs found
D. Thorburn Burns, R. Klaus Muller, Reiner Salzer, Gerhard Werner: Important figures of analytical chemistry from Germany in brief biographies. From the middle ages to the twentieth century
No full textAn ESCA Study on the Physico-chemical Transformations at the Atomizer Surface During Electrothermal Atomization Stages. Case of Lead Oxides on Graphite.
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XPS and SIMS surface chemical analysis of some important classes of polymeric biomaterials
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Oxygen Electrodes in Fused Salts. Investigation and Mechanistic Remarks on the System (Ni)O2,H2O/OH- in the (Na,K)NO3 Eutectic Melt.
No full textDifferential Pulse Voltammetry as 'in situ' Monitoring Technique for Thermal Decomposition Kinetics of Nitrate Melts.
No full textDifferential pulse voltammetry was used to detect 10 ppb NO2- in fused alkali metal nitrates. The technique was employed for studying the thermal decompn. kinetics of KNO3 and NaNO3 melts under O at 510-620 K. A pseudo-zero-order process was found, characterized by a kinetic const. of 7.6 10-11 mol/kg/s at 538 K and by an apparent activation energy of 39 kJ/mol. A mechanism of NO3- decompn. is proposed, and the equil. const. and H value for the reaction are calcd. and compared with literature data
Elettrosintesi dell'acido polipirrolo-3-carbossilico su substrati a base di titanio per la realizzazione di nuovi materiali bioattivi di potenziale applicazione in campo ortopedico.
No full textChemical Characterisation and Classification of Ceramic Sherds Excavated in the Archaelogical Area Near Canosa di Puglia
No full textNucleation and Growth of Copper particles on Pt and Pt/Poly-3-Methylthiophene Modified Electrode in Presence of Cl- Complexing Agent
No full textThe kinetics of electrochemical deposition of copper particles from Cu2+ solution on platinum and poly-3-
methylthiophene modified platinum electrode was studied in potentiostatic conditions in presence of Cl−
anions. The complex behavior of current transients suggests that the deposition process involves several
stages with different kinetics. Results obtained on platinum show that after an initial adsorption process,
the copper deposition is accomplished through two different models: a three-dimensional nucleation
and growth under diffusive control (3DPD model) and a progressive nucleation and two-dimensional
growth (2DP model). The analysis of current transients recorded on platinum poly-3-methylthiophene
modified electrode (Pt/PMT) shows a very different behavior. On Pt modified electrode a process of growth
related to a semi-infinite diffusion to a planar surface was accompanied by two different mechanisms
of nucleation and growth: a three-dimensional nucleation and growth with no diffusive control (3DP
model) and an instantaneous nucleation with two-dimensional growth (2DP model)
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