Multidisciplinary study on the hydrogelation of digold(I) complex [{Au(9N-adeninate)}2(μ-dmpe)]: optical, rheological, and quasi-elastic neutron scattering perspectives

2021 ◽  
Author(s):  
José Maria López-de-Luzuriaga ◽  
Daniel Blasco ◽  
Miguel Monge ◽  
Maria Elena Olmos ◽  
María Rodríguez-Castillo ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
X Ray Diffraction ◽  
Elastic Neutron ◽  
X Ray ◽  
Multidisciplinary Study ◽  
Elastic Neutron Scattering ◽  
Aurophilic Interaction

Herein, the syntheses of [{Au(9N-adeninate)}2(μ-dmpe)] (2, dmpe = 1,2-bis(dimethylphosphino)ethane) and its chloride precursor [(AuCl)2(μ-dmpe)] (1) are described. X-ray diffraction of 2 reveals a short intramolecular aurophilic interaction (2.9919(8) Å), which...

Thermal behavior, structure, and dynamics of low-temperature water confined in mesoporous organosilica by differential scanning calorimetry, X-ray diffraction, and quasi-elastic neutron scattering

2012 ◽  
Vol 85 (1) ◽  
pp. 289-305 ◽  
Author(s):  
Mai Aso ◽  
Kanae Ito ◽  
Hiroaki Sugino ◽  
Koji Yoshida ◽  
Takeshi Yamada ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Water Molecule ◽  
Neutron Scattering ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Elastic Neutron ◽  
X Ray ◽  
Mesoporous Organosilica ◽  
Condensed Water ◽  
Elastic Neutron Scattering

Differential scanning calorimetry (DSC), X-ray diffraction (XRD), and quasi-elastic neutron scattering (QENS) measurements have been made at 200~330 K for capillary-condensed water confined in periodic mesoporous organosilica (PMO) materials with the phenyl groups embedded in silica matrix (Ph-PMO; pore diameter 30 Å). The DSC data showed that the capillary-condensed water in Ph-PMO freezes at 228 K. X-ray radial distribution functions (RDFs) showed that the tetrahedral-like hydrogen-bonded structure of water is distorted in Ph-PMO pores, compared with bulk water; however, with lowering temperature the tetrahedral moiety of water is gradually recovered in the pores. Below the freezing point, cubic ice Ic was formed in the Ph-PMO pores. The QENS data showed that the translational diffusion constant and the residence time and the rotational relaxation time of water molecule in Ph-PMO are comparable with those in bulk. The corresponding activation energies suggested that the more hydrophobic the nature of the wall is, the smaller the activation energy of diffusion and rotation of a water molecule; this implies that water molecules confined in the hydrophobic pores are present in the core of the pores, whereas those in the hydrophilic pores strongly interact with the silanol groups.

Membranes studied using neutron scattering and NMR

1995 ◽  
Vol 73 (11-12) ◽  
pp. 687-696 ◽  
Author(s):  
Myer Bloom ◽  
Thomas M. Bayerl
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Neutron Scattering ◽  
Spectral Characteristics ◽  
Nmr Relaxation ◽  
Elastic Neutron ◽  
Fluid Membranes ◽  
Dynamical Properties ◽  
Elastic Neutron Scattering ◽  
Complementary Techniques

After reviewing some of the basic measurements that characterize the study of physical properties of matter using neutron scattering and nuclear magnetic resonance (NMR), connections between information obtained in current research on fluid membranes using these two complementary techniques are explored in two major chapters. In the first, the type of information on the structure of fluid membranes obtained from coherent elastic neutron scattering is compared with that from NMR spectral characteristics. Then, the type of information obtained on dynamical properties from NMR relaxation (T1 and T2) measurements is compared with that from quasi-elastic neutron scattering. Examples of such connections are given with an emphasis on relationships between the time and distance scales intrinsic to neutron scattering and NMR.

A quasi-elastic neutron scattering (QNS) study

1987 ◽  
Vol 55 (2) ◽  
pp. 183-201 ◽  
Author(s):  
W. Petry ◽  
G. Vogl ◽  
A. Heidemann ◽  
K.-H. Steinmetz
Keyword(s):  
Neutron Scattering ◽  
Elastic Neutron ◽  
Elastic Neutron Scattering
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