Hydrothermal Synthesis of Zn-Smectites

Higashi, Shoji; Miki, Kazuhiko; Komarneni, Sridhar

doi:10.1346/00098600260358058

Cited by 28 publications

(23 citation statements)

References 12 publications

(12 reference statements)

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“…6 shows the XRD patterns of air dried, heated and glycerol solvated Mnhectorite. The air dried sample showed a broad 13.8 Å peak which collapsed to a slightly sharper 9.9 Å peak upon heat treatment at 300 o C for 1 h. When the air dried sample was solvated with glycerol, it expanded to 22.6 Å which is a greater expansion than that of Zn-hectorite previously synthesized by us (Higashi et al, 2002). The larger expansion of the Mn-hectorite upon glycerol solvation may reflect a lower charge density (Komarneni and Breval, 1985).…”

Section: Expansion-collapse and Thermal Propertiesmentioning

confidence: 70%

“…7. When compared to Zn-hectorite (Higashi et al, 2002), the dehydroxylation of Mn-hectorite occurred in a lower temperature range of (Fig. 7).…”

Section: Expansion-collapse and Thermal Propertiesmentioning

confidence: 96%

“…Low temperature hydrothermal synthesis of micas with Zn in octahedral sheets was reported by Perrotta and Garland (1975) and Komarneni and Newalkar ( 2003). Higashi et al (2002) Tables 1-3) Morphological aspects and phase purity of the crystallized Mn-hectorite product were investigated by scanning electron microscope (SEM) observation using a JSM-6500F equipped with a EDS analyzing system.…”

Section: Introductionmentioning

confidence: 99%

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Mn-smectites: Hydrothermal synthesis and characterization

Higashi¹,

Miki²,

Komarneni³

2007

Applied Clay Science

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Section: Expansion-collapse and Thermal Propertiesmentioning

confidence: 70%

“…7. When compared to Zn-hectorite (Higashi et al, 2002), the dehydroxylation of Mn-hectorite occurred in a lower temperature range of (Fig. 7).…”

Section: Expansion-collapse and Thermal Propertiesmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Mn-smectites: Hydrothermal synthesis and characterization

Higashi¹,

Miki²,

Komarneni³

2007

Applied Clay Science

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“…This band at 1630 cm −1 due to the OH-bending mode of interlayer water is typical of 2:1 layered trioctahedral clay minerals 24 . After addition of succinate, the bands from the amorphous gel at 604 and 1009 cm −1 show the prominent development of sauconite shoulders from symmetric Zn-O vibration at 66 cm −1 , and asymmetric in plane Si-O-Si vibration at 1020 cm −1 22, 25 . The bands at 1404 and 1383 cm −1 in the amorphous gel are due to a small amounts of sodium nitrate left from the synthesis 26 .…”

Section: Resultsmentioning

confidence: 99%

Catalyzed Synthesis of Zinc Clays by Prebiotic Central Metabolites

Zhou

Basu

Hartman

et al. 2017

Sci Rep

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How primordial metabolic networks such as the reverse tricarboxylic acid (rTCA) cycle and clay mineral catalysts coevolved remains a mystery in the puzzle to understand the origin of life. While prebiotic reactions from the rTCA cycle were accomplished via photochemistry on semiconductor minerals, the synthesis of clays was demonstrated at low temperature and ambient pressure catalyzed by oxalate. Herein, the crystallization of clay minerals is catalyzed by succinate, an example of a photoproduced intermediate from central metabolism. The experiments connect the synthesis of sauconite, a model for clay minerals, to prebiotic photochemistry. We report the temperature, pH, and concentration dependence on succinate for the synthesis of sauconite identifying new mechanisms of clay formation in surface environments of rocky planets. The work demonstrates that seeding induces nucleation at low temperatures accelerating the crystallization process. Cryogenic and conventional transmission electron microscopies, X-ray diffraction, diffuse reflectance Fourier transformed infrared spectroscopy, and measurements of total surface area are used to build a three-dimensional representation of the clay. These results suggest the coevolution of clay minerals and early metabolites in our planet could have been facilitated by sunlight photochemistry, which played a significant role in the complex interplay between rocks and life over geological time.

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“…Synthetic saponites, [165][166][167]169 polymer-containing Mg-silicate-HT, 167,168 and HT 169 were synthesized using modified hydrothermal methods. The reactants were added sequentially, and after ca.…”

Section: Pnc With Synthetic Laboratory-scale Made Silicatesmentioning

confidence: 99%

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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Hydrothermal Synthesis of Zn-Smectites

Cited by 28 publications

References 12 publications

Mn-smectites: Hydrothermal synthesis and characterization

Mn-smectites: Hydrothermal synthesis and characterization

Catalyzed Synthesis of Zinc Clays by Prebiotic Central Metabolites

Synthetic, layered nanoparticles for polymeric nanocomposites (PNCs)

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