scholarly journals Molecular probe dynamics and free volume heterogeneities in n-propanol confined in a regular MCM-41 matrix by ESR and PALS

RSC Advances ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 2283-2294 ◽  
Author(s):  
Josef Bartoš ◽  
Helena Švajdlenková ◽  
Ondrej Šauša
Keyword(s):  
Free Volume ◽  
Spin Probe ◽  
Molecular Probe ◽  
Mcm 41

A combined investigation of the spin probe TEMPO mobility and the free volume holes in n-propanol (n-PrOH) confined in a regular virgin MCM-41 matrix by means of ESR or PALS techniques, respectively, is reported.

scholarly journals On the Mutual Relationships between Molecular Probe Mobility and Free Volume and Polymer Dynamics in Organic Glass Formers: cis-1,4-poly(isoprene)

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 294
Author(s):  
Helena Švajdlenková ◽  
Ondrej Šauša ◽  
Sergey V. Adichtchev ◽  
Nikolay V. Surovtsev ◽  
Vladimir N. Novikov ◽  
...  
Keyword(s):  
Free Volume ◽  
Spin Probe ◽  
Hyperfine Coupling Constant ◽  
Organic Glass ◽  
Molecular Probe ◽  
Positron Annihilation Lifetime ◽  
Broadband Dielectric Spectroscopy ◽  
Relaxation Modes ◽  
Reorientation Dynamics ◽  
In Cis

We report on the reorientation dynamics of small spin probe 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) in cis-1,4-poly(isoprene) (cis-1,4-PIP10k) from electron spin resonance (ESR) and the free volume of cis-1,4-PIP10k from positron annihilation lifetime spectroscopy (PALS) in relation to the high-frequency relaxations of cis-1,4-PIP10k using light scattering (LS) as well as to the slow and fast processes from broadband dielectric spectroscopy (BDS) and neutron scattering (NS). The hyperfine coupling constant, 2Azz′(T), and the correlation times, τc(T), of cis-1,4-PIP10k/TEMPO system as a function of temperature exhibit several regions of the distinct spin probe TEMPO dynamics over a wide temperature range from 100 K up to 350 K. The characteristic ESR temperatures of changes in the spin probe dynamics in cis-1,4-PIP10k/TEMPO system are closely related to the characteristic PALS ones reflecting changes in the free volume expansion from PALS measurement. Finally, the time scales of the slow and fast dynamics of TEMPO in cis-1,4-PIP10k are compared with all of the six known slow and fast relaxation modes from BDS, LS and NS techniques with the aim to discuss the controlling factors of the spin probe reorientation mobility in polymer, oligomer and small molecular organic glass-formers.

Properties of the Silica Layer during the Formation of MCM-41 Studied by EPR of a Silica-Bound Spin Probe

2005 ◽  
Vol 109 (16) ◽  
pp. 7807-7816 ◽  
Author(s):  
Debbie Baute ◽  
Veronica Frydman ◽  
Herbert Zimmermann ◽  
Shifi Kababya ◽  
Daniella Goldfarb
Keyword(s):  
Spin Probe ◽  
Silica Layer ◽  
Mcm 41

The Condensation Process of Alcohol Molecules in the Nanochannel of MCM-41:  A Spin-Probe ESR Study

2008 ◽  
Vol 112 (3) ◽  
pp. 786-793 ◽  
Author(s):  
Masaharu Okazaki ◽  
Shinpei Iwamoto ◽  
Yoshimi Sueishi ◽  
Kazumi Toriyama
Keyword(s):  
Spin Probe ◽  
Condensation Process ◽  
Mcm 41

Spin-Probe ESR Study on the Entrapment of Organic Solutes by the Nanochannel of MCM-41 in Benzene

Langmuir ◽  
2007 ◽  
Vol 23 (3) ◽  
pp. 1215-1222 ◽  
Author(s):  
Masaharu Okazaki ◽  
Sambandam Anandan ◽  
Sindhu Seelan ◽  
Masakazu Nishida ◽  
Kazumi Toriyama
Keyword(s):  
Spin Probe ◽  
Organic Solutes ◽  
Mcm 41

Spin-Probe Study on the Dynamics and Distribution of Solution Molecules in the Nano-Channel of MCM-41

2004 ◽  
Vol 77 (1) ◽  
pp. 87-93 ◽  
Author(s):  
Masaharu Okazaki ◽  
Kazumi Toriyama ◽  
Naoya Sawaguchi ◽  
Kiichi Oda
Keyword(s):  
Spin Probe ◽  
Nano Channel ◽  
Mcm 41

Molecular probe dynamics and free volume in glass-formers: 1,2- and 1,4-poly(butadiene)s

2013 ◽  
Vol 584 ◽  
pp. 88-92 ◽  
Author(s):  
J. Bartoš ◽  
H. Švajdlenková ◽  
Y. Yu ◽  
G. Dlubek ◽  
R. Krause-Rehberg
Keyword(s):  
Free Volume ◽  
Molecular Probe

Spin probe dynamics in relation to free volume in crystalline organics from ESR and PALS: Cyclohexane

2016 ◽  
Vol 643 ◽  
pp. 98-102 ◽  
Author(s):  
H. Švajdlenková ◽  
B. Zgardzinska ◽  
M. Lukešová ◽  
J. Bartoš
Keyword(s):  
Free Volume ◽  
Spin Probe
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