129Xe-NMR study of free volume in amorphous perfluorinated polymers: comparsion with other methods

Golemme, Giovanni; Nagy, J.B.; Fonseca, A.; Algieri, Catia; Yampolskii, Yu. P.

doi:10.1016/s0032-3861(03)00450-6

Cited by 62 publications

(57 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A number of techniques may be used to study free volume in polymers, including spin probe methods,24 molecular modeling,25, 26 inverse gas chromatography,27 small‐angle X‐ray scattering,28 129 Xe NMR,12, 29 and positron annihilation lifetime spectroscopy (PALS) 11, 30–32. PALS is one of the most widely applied techniques and provides the most direct and detailed information on the size and concentration of free volume elements in the materials.…”

Section: Introductionmentioning

confidence: 99%

Crosslinking and stabilization of nanoparticle filled poly(1‐trimethylsilyl‐1‐propyne) nanocomposite membranes for gas separations

Shao

Samseth

Hägg

2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

Poly(1-trimethylsilyl-1-propyne) (PTMSP) has been crosslinked using 4,4 0 -diazidobenzophenone bisazide to improve its chemical and physical stability over time. Crosslinking PTMSP renders it insoluble in good solvents for the uncrosslinked polymer. Gas permeability and fractional free volume decreased as crosslinker content increased, while gas sorption was unaffected by crosslinking. Therefore, the reduction in permeability upon crosslinking PTMSP was due to decrease in diffusion coefficient. Compared with the pure PTMSP membrane, the permeability of the crosslinked membrane is initially reduced for all gases tested due to the crosslinking. By adding nanoparticles (fumed silica, titanium dioxide), the permeability is again increased; permeability reductions due to crosslinking could be offset by adding nanoparticles to the membranes. Increased selectivity is documented for the gas pairs O 2 /N 2 , H 2 /N 2 , CO 2 /N 2 , CO 2 /CH 4 , and H 2 /CH 4 using crosslinking and addition of nanoparticles. Crosslinking is successful in maintaining the permeability and selectivity of PTMSP membranes and PTMSP/filler nanocomposites over time.

show abstract

Section: Introductionmentioning

confidence: 99%

Crosslinking and stabilization of nanoparticle filled poly(1‐trimethylsilyl‐1‐propyne) nanocomposite membranes for gas separations

Shao

Samseth

Hägg

2009

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Restricted diffusion within the fiber pores leads to broad signal distributions up to approximately 40 ppm. [9,10] The high signal for OXYPHAN within this region corresponds to the larger pore sizes of this material. 129 Xe that diffuses into the polymer yields broad signals at approximately 223 ppm for the PMP fiber and 230 ppm for the two PP fibers, which is in good agreement with previous studies.…”

Section: Resultsmentioning

confidence: 93%

NMR and MRI of Blood‐Dissolved Hyperpolarized Xe‐129 in Different Hollow‐Fiber Membranes

et al. 2011

View full text Add to dashboard Cite

Magnetic resonance of hyperpolarized (129)Xe has found a wide field of applications in the analysis of biologically relevant fluids. Recently, it has been shown that the dissolution of hyperpolarized gas into the fluid via hollow-fiber membranes leads to bubble-free (129)Xe augmentation, and thus to an enhanced signal. In addition, hollow-fiber membranes permit a continuous operation mode. Herein, a quantitative magnetic resonance imaging and spectroscopy analysis of a customized hollow-fiber membrane module is presented. Different commercial hollow-fiber membrane types are compared with regard to their (129)Xe dissolution efficiency into porcine blood, its constituents, and other fluids. The presented study gives new insight into the suitability of these hollow-fiber membrane types for hyperpolarized gas dissolution setups.

show abstract

“…Similar to biomolecular NMR of proteins, Xe NMR was utilized to examine the properties of different porous systems such as zeolites [ 32 , 33 ], aluminophosphates [ 34 , 35 ], polymers [ 36 , 37 , 38 ], self-assembling dimer [ 39 ], organic zeolite isomorphs [ 40 ], and metal organic framework (MOF) [ 41 ], respectively. Details pertaining to pore size, pore volume and surface area can be obtained through different techniques, e.g., powder X-ray, TEM, adsorption isotherms etc.…”

Section: Xenon-host Interactions: the Basis For Functionalized mentioning

confidence: 99%

Molecular Sensing with Host Systems for Hyperpolarized 129Xe

Jayapaul

Schröder

2020

Molecules

View full text Add to dashboard Cite

Hyperpolarized noble gases have been used early on in applications for sensitivity enhanced NMR. 129Xe has been explored for various applications because it can be used beyond the gas-driven examination of void spaces. Its solubility in aqueous solutions and its affinity for hydrophobic binding pockets allows “functionalization” through combination with host structures that bind one or multiple gas atoms. Moreover, the transient nature of gas binding in such hosts allows the combination with another signal enhancement technique, namely chemical exchange saturation transfer (CEST). Different systems have been investigated for implementing various types of so-called Xe biosensors where the gas binds to a targeted host to address molecular markers or to sense biophysical parameters. This review summarizes developments in biosensor design and synthesis for achieving molecular sensing with NMR at unprecedented sensitivity. Aspects regarding Xe exchange kinetics and chemical engineering of various classes of hosts for an efficient build-up of the CEST effect will also be discussed as well as the cavity design of host molecules to identify a pool of bound Xe. The concept is presented in the broader context of reporter design with insights from other modalities that are helpful for advancing the field of Xe biosensors.

show abstract

129Xe-NMR study of free volume in amorphous perfluorinated polymers: comparsion with other methods

Cited by 62 publications

References 38 publications

Crosslinking and stabilization of nanoparticle filled poly(1‐trimethylsilyl‐1‐propyne) nanocomposite membranes for gas separations

Crosslinking and stabilization of nanoparticle filled poly(1‐trimethylsilyl‐1‐propyne) nanocomposite membranes for gas separations

NMR and MRI of Blood‐Dissolved Hyperpolarized Xe‐129 in Different Hollow‐Fiber Membranes

Molecular Sensing with Host Systems for Hyperpolarized 129Xe

Contact Info

Product

Resources

About