Interfacial adsorption of solvents in a porous polymer resin: a carbon-13 spin-echo and ESR study

1991 ◽  
Vol 95 (16) ◽  
pp. 6058-6060 ◽  
Author(s):  
C. Chachaty ◽  
J. P. Korb
Keyword(s):  
Spin Echo ◽  
Porous Polymer ◽  
Polymer Resin ◽  
Porous Polymer Resin ◽  
Interfacial Adsorption

scholarly journals The Effect of an Adsorbent Matrix on Recovery of Microorganisms from Hydrocarbon-Contaminated Groundwater

2021 ◽  
Vol 9 (1) ◽  
pp. 90
Author(s):  
Nicole M. Taylor ◽  
Courtney R. A. Toth ◽  
Victoria Collins ◽  
Paolo Mussone ◽  
Lisa M. Gieg
Keyword(s):  
Oil And Gas ◽  
Complex Structure ◽  
Community Analysis ◽  
Porous Polymer ◽  
Hydrocarbon Biodegradation ◽  
Contaminated Groundwater ◽  
Contaminated Aquifer ◽  
Polymer Resin ◽  
Terrestrial Environments ◽  
Porous Polymer Resin

The microbial degradation of recalcitrant hydrocarbons is an important process that can contribute to the remediation of oil and gas-contaminated environments. Due to the complex structure of subsurface terrestrial environments, it is important to identify the microbial communities that may be contributing to biodegradation processes, along with their abilities to metabolize different hydrocarbons in situ. In this study, a variety of adsorbent materials were assessed for their ability to trap both hydrocarbons and microorganisms in contaminated groundwater. Of the materials tested, a porous polymer resin (Tenax-TA) recovered the highest diversity of microbial taxa in preliminary experiments and was selected for additional (microcosm-based) testing. Oxic and anoxic experiments were prepared with groundwater collected from a contaminated aquifer to assess the ability of Tenax-TA to adsorb two environmental hydrocarbon contaminants of interest (toluene and benzene) while simultaneously providing a surface for microbial growth and hydrocarbon biodegradation. Microorganisms in oxic microcosms completely degraded both targets within 14 days of incubation, while anoxically-incubated microorganisms metabolized toluene but not benzene in less than 80 days. Community analysis of Tenax-TA-associated microorganisms revealed taxa highly enriched in sessile hydrocarbon-degrading treatments, including Saprospiraceae, Azoarcus, and Desulfoprunum, which may facilitate hydrocarbon degradation. This study showed that Tenax-TA can be used as a matrix to effectively trap both microorganisms and hydrocarbons in contaminated environmental systems for assessing and studying hydrocarbon-degrading microorganisms of interest.

scholarly journals Preconcentration of Cu(II), Ni(II) and Co(II) with 1-phenyl-3-methyl-4-stearoyl-5-pyrazolone loaded on a porous polymer resin.

1993 ◽  
Vol 42 (11) ◽  
pp. 733-736
Author(s):  
Kenji SATO ◽  
Hiroyuki OKUYAMA ◽  
Shigeyuki TANAKA ◽  
Yoshifumi AKAMA
Keyword(s):  
Porous Polymer ◽  
Polymer Resin ◽  
Porous Polymer Resin

NMR Studies of Nanoscale Organization and Dynamics in Polymer Electrolytes

2004 ◽  
Vol 57 (12) ◽  
pp. 1185 ◽  
Author(s):  
William S. Price ◽  
Yuichi Aihara ◽  
Kikuko Hayamizu
Keyword(s):  
Molecular Weight ◽  
Spin Echo ◽  
Three Dimensional ◽  
Nmr Relaxation ◽  
Polymer Chains ◽  
Porous Polymer ◽  
Random Copolymers ◽  
Nmr Studies ◽  
Viscous Liquids ◽  
Pgse Nmr

Multinuclear (i.e., 7Li, 19F, and 1H) NMR relaxation and pulsed field gradient spin-echo (PGSE) NMR translational diffusion measurements have been used to study the reorientational and translational dynamics of the polymeric, anionic, and cationic species in a polymer electrolyte system composed of high-molecular-weight comb-branched polyethers and their precursor macromonomers of cross-linked random copolymers, with and without LiN(SO2CF3)2 (LiTFSI) doping. The macromonomers are derivatives of glycerol bonded to ethylene oxide-co-propylene oxide (m(EO-PO)) and are viscous liquids with a molecular weight of approximately 8000. The results were consistent with a picture of the lithium ions undergoing local motions near the polymer chains, whereas the anions diffuse through a slowly fluctuating three-dimensional porous polymer matrix. Four years later, the macromonomer electrolyte samples were re-measured to investigate the effects of long-term aging. The NMR data revealed that the electrolyte has undergone significant structural relaxation. The findings shed light on the evolving molecular architectures that influence conductivity and help to explain the non-ideal conductivity behaviour.

Spin-echo observation of radio frequency induced flux lattice annealing (RIFLA) in a type-II superconductor

1999 ◽  
Vol 09 (PR10) ◽  
pp. Pr10-49-Pr10-51
Author(s):  
W. G. Clark ◽  
F. Lefloch ◽  
M. E. Hanson ◽  
W. H. Wong
Keyword(s):  
Radio Frequency ◽  
Spin Echo ◽  
Type Ii ◽  
Type Ii Superconductor ◽  
Flux Lattice

STIMULATED SPIN ECHO STUDIES OF 60Co NUCLEI ORIENTED IN IRON

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-1182-C6-1183
Author(s):  
H. R. Foster ◽  
P. Cooke ◽  
D. H. Chaplin ◽  
P. Lynam ◽  
D. E. Swan ◽  
...  
Keyword(s):  
Spin Echo

MRCP im Mausmodell bei 7 T - Vergleich von 2D und 3D Spin-Echo-Techniken

2013 ◽  
Vol 185 (S 01) ◽  
Author(s):  
TM Ernst ◽  
N Raabe ◽  
D Schwinge ◽  
C Schramm ◽  
MG Kaul ◽  
...  
Keyword(s):  
Spin Echo

Nichtinvasive Beurteilung aortokoronarer Venenbrücken mit Kernspintomographie

1989 ◽  
Vol 28 (06) ◽  
pp. 234-242 ◽  
Author(s):  
U. Sechtem ◽  
Sabine Langkamp ◽  
M. Jungehülsing ◽  
H. H. Hilger ◽  
H. Schicha ◽  
...  
Keyword(s):  
Magnetic Resonance Imaging ◽  
Coronary Artery ◽  
Magnetic Resonance ◽  
Coronary Artery Bypass ◽  
Spin Echo ◽  
Artery Bypass ◽  
Graft Patency ◽  
Coronary Artery Bypass Grafts ◽  
Resonance Imaging ◽  
Low Sensitivity

Fortyfour patients with recent cardiac catheterization because of recurrent chest pain after coronary artery bypass surgery were studied by magnetic resonance imaging to evaluate graft patency. To assess the efficacy of this non-invasive method 92 coronary artery bypass grafts were examined by the spin-echo technique. ECG-gated transversal sections were acquired between the diaphragm and the aortic arch. The specificity of magnetic resonance imaging was 83% (48/58) for patent grafts. However, the sensitivity in the detection of occluded bypasses was only 56% (19/34). Despite the good specificity, clinical applications of this method are limited because of its low sensitivity.

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