Protonation and doping behavior of polypyrrole films and powders

In chemistry, protonation is the addition of a proton (H+) t...

Abstract The results on protonation in solutions and melts of salts and acids, as well as structural changes associated with the formation of nanocomposition (NC) structure of materials are presented. The associated protonation is a necessary condition for proton separation of structural units (PSU) in NC structure model. The shape and size of PSU in simple substances and compounds and their variation in phase transition have been determined with the use of modified formula of cinematic diffraction theory applied to minimal scattering volumes....

Abstract The results on protonation in solutions and melts of salts and acids, as well as structural changes associated with the formation of nanocomposition (NC) structure of materials are presented. The associated protonation is a necessary condition for proton separation of structural units (PSU) in NC structure model. The shape and size of PSU in simple substances and compounds and their variation in phase transition have been determined with the use of modified formula of cinematic diffraction theory applied to minimal scattering volumes....

Protonation of ketoconazole in relation to fungistatic activity. Beggs WH. PMID: 1766459 [PubMed - indexed for MEDLINE]

Abstract The elastic mechanical response of a poly(4-vinylpyridine) film is exploited to create nanostructures under ambient conditions via dip pen nanolithography. Using a pH 4 phosphate buffer solution as the "ink," a series of experimental results indicates that the nanometer-sized structures are due to local swelling of the film's pyridyl groups upon their protonation with the hydronium ions delivered by the tip. Control over the structures' height is gained by properly selecting the writing velocities or the dwell time, respectively.

Abstract Not Available

Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, Japan.

PMID: 971 [PubMed - indexed for MEDLINE]

Department of Material and Life Science, Graduate School of Engineering, Osaka University and SORST (JST), 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan. kojima@chem.eng.osaka-u.ac.jp (T. K.) fukuzumi@chem.eng.osaka-u.ac.jp (S. F.).

Quantitative treatments of protonation equilibria shifts in micellar systems. Minero C, Pelizzetti E. Dipartimento di Chimica Analitica, Universit? di Torino, Italy. The paper reviews the theoretical models and equations used for the interpretation of weak acid dissociation equilibria in the presence of micellar systems. The models and the equations of the literature can be rewritten and reinterpreted in terms of the generalized pseudophase model, for which the basic equations are reported. Some new relationships for the titration of weak ac...

Specific ion effects: Role of salt and buffer in protonation of cytochrome c. Bostr?m M, Williams DR, Ninham BW. Department of Physics and Measurement Technology, Link?ping University, Sweden. mabos@ifm.liu.se Changes in background salt and buffer are known to influence the properties of proteins. The reasons have remained obscure. The challenge posed by many such problems is this. Can physical chemistry contribute any predictive quantitative insights to what is in effect the simplest macromolecular solution behavior? Or must all remain spec...