𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Molecular Conformation and Mobility of Polyamines Adsorbed on Silica Studied by Spin Labeling

✍ Scribed by A. Afif; H. Hommel; A.P. Legrand; M. Bacquet; E. Gailliez-Degremont; M. Morcellet

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
138 KB
Volume
211
Category
Article
ISSN
0021-9797

No coin nor oath required. For personal study only.

✦ Synopsis

Poly(ethyleneimine) and poly(4-vinylpyridine) chains adsorbed on Nucleosil silica have been randomly labeled with nitroxide free radicals. The EPR signal is very sensitive to the molecular Brownian motion of the segments and shows generally at least two different environments: trains adsorbed on the surface with a restricted mobility, and loops and tails protruding into the solution with a fast motion. The rotational correlation times and the relative fraction of each population are given as functions of the coverage achieved and of the specific surface area of the silica for the samples in contact with methanol and sometimes water. The overall picture is consistent with a diffuse layer for the PEI and a more compact one with some heterogeneities for the P 4 VP.

📜 SIMILAR VOLUMES

Adsorbed behavior of spin-labeled silane
Adsorbed behavior of spin-labeled silane coupling agent on colloidal silica studied by electron spin resonance
✍ Nishiyama, Norihiro ;Katsuki, Hirokazu ;Horie, Kozo ;Asakura, Tetsuo 📂 Article 📅 1987 🏛 John Wiley and Sons 🌐 English ⚖ 460 KB 👁 1 views

The adsorption mechanism of silane coupling agent on the colloidal silica surface is studied with spin-labeled silane coupling agent using ESR method. The density of the adsorbed silane molecules was determined to be approximately 1.5-2 molecules per 100 A of the silica surface in 95% ethanol soluti

Adsorbed behavior of spin-labeled poly(m
Adsorbed behavior of spin-labeled poly(methyl methacrylate) on human tooth and hydroxyapatite studied by electron spin resonance
✍ Asakura, Tetsuo ;Suzuki, Kazuomi ;Horie, Kozo ;Sakai, Harutoshi ;Imamura, Yoshio 📂 Article 📅 1982 🏛 John Wiley and Sons 🌐 English ⚖ 168 KB 👁 1 views

An improvement in the adhesion between polymers and hard tooth tissues would be an important advance in preventive and restorative dentistry.' To achieve this improvement, there is a great need to study the molecular level interactions that take place between polymers and the tooth surface. In order

Solid-state 19F MAS NMR study on the con
Solid-state 19F MAS NMR study on the conformation and molecular mobility of poly(chlorotrifluoroethylene)
✍ Hiroto Tatsuno; Keitaro Aimi; Shinji Ando 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 302 KB

## Abstract The temperature dependence of molecular mobility and conformational changes of poly(chlorotrifluoro‐ ethylene) (PCTFE) have been investigated by solid‐state ^19^F magic angle spinning (MAS) NMR spectroscopy. The pulse techniques of dipolar–filter and __T__~1ρ~–filter allow selective obs

Effect of tacticity on conformation of p
Effect of tacticity on conformation of p-tert-butylphenol acetaldehyde resins as studied by molecular simulation
✍ Sung-Seen Choi 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 171 KB

p-tert-Butylphenol acetaldehyde resins can have isotactic, syndiotactic, and atactic sequences. Structural characteristics of the p-tert-butylphenol acetaldehyde resin with different tacticities were studied using molecular mechanics and molecular dynamics. Trimer-decamer isotactic and syndiotactic

Conformational study of AZT in aqueous s
Conformational study of AZT in aqueous solution and adsorbed on a silver surface by means of Raman spectroscopy
✍ Laura Rivas; Santiago Sanchez-Cortes; José V. García-Ramos 📂 Article 📅 2002 🏛 John Wiley and Sons 🌐 English ⚖ 114 KB 👁 1 views

## Abstract The adsorption and conformation of the anti‐HIV drug AZT, and also thymine and 2′‐deoxythymidine, were studied on Ag colloids by surface‐enhanced Raman spectroscopy, showing that the conformational change induced by the adsorption on an Ag surface is similar to that induced by an alkali