Kinetics of Cross-Polarization in Solid-State NMR:  A Guide for Chemists

Kołodziejski, Wacław; Klinowski, Jacek

doi:10.1021/cr000060n

Cited by 419 publications

(512 citation statements)

References 49 publications

Supporting

Mentioning

493

Contrasting

Order By: Relevance

“…In advance of the measurement of the CP build-up curves we checked the dephasing behavior of the magnetization of 1 H and 13 C during the spin-locks using the pulse sequences presented in ref. 56. These revealed no significant dephasing in the relevant timescale of 20 ms (T 1r was estimated to some hundred milliseconds for both 1 H and 13 C).…”

Section: Solid-state Nmr Spectroscopymentioning

confidence: 82%

Tackling the stacking disorder of melon—structure elucidation in a semicrystalline material

Seyfarth

Lotsch

et al. 2010

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

In this work we tackle the stacking disorder of melon, a layered carbon imide amide polymer with the ideal composition (C 6 N 7 (NH)(NH 2 )). Although its existence has been postulated since 1834 the structure of individual melon layers could only recently be solved via electron diffraction and high-resolution 15 respectively. Furthermore, the homogeneity of the material under examination was investigated exploiting 15 N spin-diffusion. Based on force field methods 256 structure models with varying lateral arrangements between neighboring layers were created. For each model the M 2 were calculated allowing them to be ranked by comparing calculated and measured M 2 as well as via their force field energies. This allows the creation of markedly structured hypersurfaces with two distinctly favored shift vectors for the displacement of neighboring layers.

show abstract

Section: Solid-state Nmr Spectroscopymentioning

confidence: 82%

Tackling the stacking disorder of melon—structure elucidation in a semicrystalline material

Seyfarth

Lotsch

et al. 2010

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…While T CH and T 1qC characterize the individual chemical and/or crystallographic sites in a solid, T 1qH is influenced by the efficiency of spin diffusion and represents a volume property averaged over a distance of approximately 2-30 nm (Botto et al, 1987;Newman, 1992b;Kolodziejski and Klinowski, 2002). Thus, changes in the average mobility should be indicated by a change in this parameter.…”

Section: Impact Of Charring On the Cp Dynamicsmentioning

confidence: 99%

“…During the relatively fast increase in the signal intensity, oscillations are visible for all samples. In crystalline domains, CP can proceed through transient harmonic oscillations (Mü ller et al, 1974;Kolodziejski and Klinowski, 2002). For the peat materials and the charcoal, relatively short T CHS between 21 and 35 ls were found for approximately 60-76% of their aryl C. For the soil FA, T CHS is 60 ls.…”

Section: Impact Of Charring On the Cp Dynamicsmentioning

confidence: 99%

Condensation degree of burnt peat and plant residues and the reliability of solid-state VACP MAS 13C NMR spectra obtained from pyrogenic humic material

Knicker

Totsche

Almendros

et al. 2005

Organic Geochemistry

129

View full text Add to dashboard Cite

“…The solid lines in Figure 4 were obtained from the least-square fit of the conventional equation for the carbon magnetization behavior M C (t) at various CP contact times as follows: 22,27 …”

Section: Resultsmentioning

confidence: 99%

Structural characterization of silk-polyurethane composite material for biomaterials using solid-state NMR

Nakazawa

Asano

Nakazawa

et al. 2012

Polym J

View full text Add to dashboard Cite

In this paper, we performed solid-state nuclear magnetic resonance (NMR) measurements, including T 1 H and T 1q , of silk fibroin (SF)/polyurethane (PU) composites to examine their possible use as a material for artificial vascular grafts. In the development of new artificial vascular grafts made from SF/PU, it is important to examine the miscibility of the composites and their molecular dynamics, because these properties are intimately involved in the resulting physical properties of the resulting vascular graft. The T 1 H measurements showed that the domain size of the SF/PU ¼ 1:1 composite is smaller than the domain size of the 1:10 and 1:2 composites, indicating that the molecular miscibility between SF and PU are partially in close proximity, particularly in the SF/PU ¼ 1:1 composite. Additionally, we observed that the molecular motion of the soft segment of PU in the SF/PU composites becomes slow, suggesting that the soft segment of PU interacts with SF to some extent. These analyses provided basic structural information for the development of silk-based artificial vascular grafts using PU.

show abstract

Kinetics of Cross-Polarization in Solid-State NMR: A Guide for Chemists

Cited by 419 publications

References 49 publications

Tackling the stacking disorder of melon—structure elucidation in a semicrystalline material

Tackling the stacking disorder of melon—structure elucidation in a semicrystalline material

Condensation degree of burnt peat and plant residues and the reliability of solid-state VACP MAS 13C NMR spectra obtained from pyrogenic humic material

Structural characterization of silk-polyurethane composite material for biomaterials using solid-state NMR

Contact Info

Product

Resources

About