Nanoporosity of an organo-clay shown by hyperpolarized xenon and 2D NMR spectroscopy

Sozzani, P; Bracco, Silvia; Comotti, Angiolina; Mauri, Michele; Simonutti, Roberto; Valsesia, Patrizia

doi:10.1039/b602040b

Cited by 45 publications

(36 citation statements)

References 34 publications

(14 reference statements)

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“…Using hyperpolarized xenon NMR, Sozzani et al 12 have studied the nanoporosity of hectorites pillared with tetraethylammonium. In pillared clays, the interlayers are permanently expanded by spacers such as large organic cations.…”

Section: Introductionmentioning

confidence: 99%

X-ray Studies of Carbon Dioxide Intercalation in Na-Fluorohectorite Clay at Near-Ambient Conditions

et al. 2012

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We show experimentally that gaseous CO2 intercalates into the interlayer space of the synthetic smectite clay Na-fluorohectorite at conditions not too far from ambient. The mean interlayer repetition distance of the clay when CO2 is intercalated is found to be 12.5 Å for the conditions -20 °C and 15 bar. The magnitude of the expansion of the interlayer upon intercalation is indistinguishable from that observed in the dehydrated-monohydrated transition for H2O, but the possibility of water intercalation is ruled out by a careful analysis of the experimental conditions and repeating the measurements exposing the clay to nitrogen gas. The dynamics of the process is observed to be dependent on the pressure, with a higher Page 2 of 15 intercalation rate at increased pressure. The rate of CO2 intercalation at the studied conditions is found to be several orders of magnitude slower than the intercalation rate of water or humidity at ambient pressure and temperature.

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Section: Introductionmentioning

confidence: 99%

X-ray Studies of Carbon Dioxide Intercalation in Na-Fluorohectorite Clay at Near-Ambient Conditions

et al. 2012

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“…11 Closer to the PNC technology were more recent publications from the group. 12,13 The object of the study was hectorite pre-intercalated with tetraethyl ammonium (4EA) during a hydrothermal synthesis, HT-4EA of the formula: (4EA) 0.66 (Mg 5.34 ,Li 0.66 )Si 8 O 20 (OH, F) 4 with d 001 ¼ 1.47 nm, in agreement with the 0.6 nm diameter of the 4EA ion. The compound was studied using the 2D advanced solid-state, Lee-Goldburg homo-nuclear decoupling MAS NMR techniques at the spinning speed of 15 kHz and contact times 2 and 8 msec.…”

Section: Introductionmentioning

confidence: 82%

Synthetic, layered nanoparticles for polymeric nanocomposites (PNCs)

Utracki

Sepehr

Boccaleri

2007

Polymers for Advanced Techs

379

252

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Synthetic, layered nano-particles for polymeric nanocomposites (PNC's)Utracki, L. A.; Sepehr, M.; Boccaleri, E.Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca.http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=fr L'accès à ce site Web et l'utilisation de son contenu sont assujettis aux conditions présentées dans le site Web page / page Web http://dx.doi.org/10.1002/pat.852 http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=15774991&lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?action=rtdoc&an=15774991&lang=fr LISEZ CES CONDITIONS ATTENTIVEMENT AVANT D'UTILISER CE SITE WEB. READ THESE TERMS AND CONDITIONS CAREFULLY BEFORE USING THIS WEBSITE.Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en This review discusses preparation and use of the synthetic layered nanoparticles in polymer matrices, i.e., in the polymeric nanocomposites (PNCs). Several types of synthetic or semi-synthetic layered materials are considered, namely the phyllosilicates (clays), silicic acid (magadiite), layered double hydroxides (LDHs), zirconium phosphates (ZrPs), and di-chalcogenides. The main advantage of synthetic clays is their chemical purity (e.g. absence of amorphous and gritty contaminants, as well as arsenic, iron, and other heavy metals), white to transparent color that assures reproducibly of brightly colored products, as well as a wide range of aspect ratios, p ¼ 20 to £6000. Several large scale production facilities have been established. The synthetic clay and LDH industries are oriented toward big volume markets: catalysis, foodstuff, cosmetics, pharmaceuticals, toiletry, etc. The use of these materials in PNCs is limited to synthetic clays and LDHs, mainly for reinforcement, permeability control, reduction of flammability, and stabilization, e.g. during dehydrohalogenation of chlorinated macromolecules. The use of lamellar ZrPs and di-chalcogenides is at the laboratory stage of functional polymeric systems development, e.g. for electrically conductive materials, catalysts or support for catalysts, in photochemistry, molecular and chiral recognition, or in fuel cell technologies, etc. Copyright # 2007 John Wiley & Sons, Ltd.KEYWORDS: polymeric nanocomposites; nanoparticles; clay; layered double hydroxides; matrix POLYMERS FOR ADVANCED TECHNOLOGIES Polym. Adv. Technol. 2007; 18: 1-37 Published online in Wiley InterScience (www.interscience.wiley.com) DOI: 10.1002/pat.852 AUTHORS' BIOGRAPHIESDr Leszek A. Utracki was born and educated (up to Habilitation) in Poland. After the post-doctoral stage at USC in Los Angeles with Robert Simha he settled in Canada. His passionate research interest has been within the field of thermodynamics, rheology and processing of multicomponent, multiphase polymeric systems. During the 55 years in the profession he has published several hundred articles, book chapters, books, patents, etc., which has placed him on the ISI li...

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“…The peaks are assigned to xenon atoms located in cavities containing either one or two xenon atoms based on the 129 Xe DQ filtered spectra. From reference [122] with permission. [132] with permission.…”

Section: Resultsmentioning

confidence: 99%

“…Interlayer nanoporosity of pillared hectorite was explored by hyperpolarized xenon NMR demonstrating the open pore accessibility of the structure to gases [122].…”

Section: Pillared Claysmentioning

confidence: 99%

129Xenon NMR: Review of recent insights into porous materials

Weiland

Springuel‐Huet

Nossov

et al. 2016

Microporous and Mesoporous Materials

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Nanoporosity of an organo-clay shown by hyperpolarized xenon and 2D NMR spectroscopy

Abstract: Interlayer nanoporosity of hectorite pillared by tetraethylammonium ions is explored by hyperpolarized xenon NMR and relevant gases such as carbon dioxide revealing the adsorption capacity of the open galleries.

Cited by 45 publications

References 34 publications

X-ray Studies of Carbon Dioxide Intercalation in Na-Fluorohectorite Clay at Near-Ambient Conditions

X-ray Studies of Carbon Dioxide Intercalation in Na-Fluorohectorite Clay at Near-Ambient Conditions

Synthetic, layered nanoparticles for polymeric nanocomposites (PNCs)

129Xenon NMR: Review of recent insights into porous materials

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