Dynamic-angle correlation spectroscopy

D dynamic-angle correlation spectroscopy (DACSY) (Fig. 11) was proposed by Medek et al.,202 which enables one to obtain the correlation of the Hamiltonians of various ranks. Clearly, this method offers more information than most conventional correlation spectra, so more precise determination of the interaction tensors and their relative orientations can be achieved. 

Pt or Pt/Au particles have also been hosted in the hydrophobic holes of nonionic surfactants, e.g., polyethylene monolaurate [46a,62]. The structure and diffusive dynamics of a colloidal palladium aggregate sol have been studied under dilute and semidilute conditions by high-resolution small angle X-ray scattering and X-ray photon correlation spectroscopy. When the sizes of the aggregates determined in the static structure and as derived from the diffusive dynamics at low concentration are consistent with each other. 

In this review, we shall introduce some basic concepts about sohd-state NMR of half-integer quadrupolar nuclei and discuss the most useful and promising methods presently available to study them. These include older methods, such as Double Rotation (DOR) and Dynamic Angle Spinning (DAS), and novel techniques including MQMAS, Quadrupolar Phase Adjusted Spinning Sidebands QPASS, SateUite Transition (ST) MAS and Inverse-STMAS NMR, and Fast Amplitude Modulation (FAM). We also discuss several techniques based on dipolar interactions between quadrupolar and spin-1/2 nuclei, such as Cross-Polarization (CP) MQMAS, MQ Heteronuclear Correlation Spectroscopy... 

Fig. 6.13 Frequency-scattering vector domeiins of available techniques for dynamic studies. The techniques in the map are Raman spectroscopy, Brillouin spectroscopy, inelastic neutron scattering (INS), inelastic X-ray scattering (IXS), neutron spin-echo spectroscopy, nuclear forward scattering (NFS), XPCS, ultrasmaU-angle X-ray scattering-based XPCS (USAXS XPCS), and DLS [also known as photon correlation spectroscopy (PCS)]...

Zhang F, Allen AJ, Levine LE, Ilavsky J, Long GG (2012) Ultra-smaU-angle X-ray scattering-X-ray photon correlation spectroscopy a new measurement technique for in-situ studies of equUibrium and nonequilibrium dynamics. MetaU Mater Trans A Phys Meteill Mater Sci 43A(5) 1445-1453. doi 10.1007/sll661-011-0790-0... 

The 2,2,6,6-tetramethylpiperidinoxyl radical (TEMPO) was first prepared in 1960 by Lebedev and Kazarnovskii by oxidation of its piperidine precursor.18 The steric hindrance of the NO bond in TEMPO makes it a highly stable radical species, resistant to air and moisture. Paramagnetic TEMPO radicals can be employed as powerful spin probes for elucidating the structure and dynamics of both synthetic and biopolymers (e.g., proteins and DNA) by ESR spectroscopy.19 Unlike solid-phase 1H-NMR where magic angle spinning is required in order to reduce the anisotropic effects in the solid-phase environment, solid-phase ESR spectroscopy can be conducted without specialized equipment. Thus, we conducted comparative ESR studies of various polymers with persistent radical labels, and we also determined rotational correlation times as a function of... 

---