Abstract

A technique is described by which the protons in water–cellulose sorption systems may be assigned to four categories. The protons are quantitatively divided into water– and cellulose-associated protons and these categories are further subdivided into interchanging and noninterchanging species. The relationships are derived on the assumption that the line narrowing observed in the NMR spectrum of celluloses on the addition of moisture is due to the rapid interchange of some of the water and cellulose protons (or their spins). The experiments were carried out at water–cellulose concentrations of about 7% on a variety of cellulose samples differing in supramolecular structure as characterized by crystalline fraction and lattice type. Data are presented which indicate that the larger the proportion of water protons involved in the interchange process, the larger the spin–spin relaxation time of those water protons not involved in the interchange. It is concluded that linewidth of the narrow component of the water-cellulose NMR signal is not related to sorption processes as simply as previously suggested.

Petrophysical applications of NMR imaging

William P. Rothwell and H. J. Vinegar
Appl. Opt. 24(23) 3969-3972 (1985)

Nuclear magnetic resonance imaging

William P. Rothwell
Appl. Opt. 24(23) 3958-3968 (1985)

Frequency-dependent skin penetration depth of terahertz radiation determined by water sorption–desorption

Borwen You, Ching-Yu Chen, Chin-Ping Yu, Pei-Hwa Wang, and Ja-Yu Lu
Opt. Express 26(18) 22709-22721 (2018)

Initiator-free photo-cross-linkable cellulose-based resists for fabricating submicron patterns via direct laser writing

Maximilian Rothammer, Dominic T. Meiers, Maximilian Maier, Georg von Freymann, and Cordt Zollfrank
J. Opt. Soc. Am. B 40(4) 849-855 (2023)

Electro-mechano-optical detection of nuclear magnetic resonance

Kazuyuki Takeda, Kentaro Nagasaka, Atsushi Noguchi, Rekishu Yamazaki, Yasunobu Nakamura, Eiji Iwase, Jacob M. Taylor, and Koji Usami
Optica 5(2) 152-158 (2018)