Thermal Characterization of Poly(Styrene Sulfonate)/Layered Double Hydroxide Nanocomposites

Oriakhi, Christopher O.

doi:10.1346/ccmn.1997.0450207

Cited by 82 publications

(52 citation statements)

References 35 publications

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“…A temperature treatment beyond 600°C caused a collapse of the layered structure (XRD results not shown) for all compounds and gave rise to new crystalline phases (mixed oxides, e.g. spinel forms) [47][48][49].…”

Section: °C Arising From Physisorbed and Interlayer Water A Seconmentioning

confidence: 99%

Layered double hydroxide-like materials: nanocomposites for use in concrete

Raki

Beaudoin

Mitchell

2004

Cement and Concrete Research

143

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr 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 NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://dx.doi.org/10.1016/j.cemconres. 2004.05.012 Cement and Concrete Research, 34, 9, pp. 1717Research, 34, 9, pp. -1724Research, 34, 9, pp. , 2004 LDH, and CaAl2NS LDH produced a tilted orientation of NBA and 26NS anions in the interlayer space, while 2NS anions induced a perpendicular bilayer arrangement.Materials characterization was carried out using X-ray diffraction, IR-spectroscopy, thermal analysis and Scanning Electron Microscopy. These preliminary results open up a new direction towards the synthesis of nanocomposites using polymeric entities and layered materials for future applications in cement and concrete science, e.g. control of the effect of admixtures on the kinetics of cement hydration by programming their temporal release.

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Section: °C Arising From Physisorbed and Interlayer Water A Seconmentioning

confidence: 99%

Layered double hydroxide-like materials: nanocomposites for use in concrete

Raki

Beaudoin

Mitchell

2004

Cement and Concrete Research

143

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“…Such mixed metal oxides are formed through the thermal decomposition of the hydrotalcite [6,7]. Hydrotalcites may also be used as components in new nano-materials such as nano-composites [8]. Hydrotalcites are important in the removal of environmental hazards in acid mine drainage [9,10].…”

Section: Introductionmentioning

confidence: 99%

Thermogravimetric analysis of hydrotalcites based on the takovite formula NixZn6-xAl2(OH)16(CO3)·4H2O

Lin

Adebajo

Frost

et al. 2005

J Therm Anal Calorim

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High resolution thermogravimetric analysis (HRTG) coupled to a gas evolution mass spectrometer has been used to study the thermal decomposition of zinc-modified hydrotalcites of takovite formulation (Ni x Zn 6-x Al 2 (CO 3 )(OH) 16 .4H 2 O) where x varies from 0 to 6. X-ray diffraction data indicate an increase in the crystallinity and decrease in the interlayer spacing of the materials with increase in the zinc composition. The results of HRTG and mass spectrometry (MS) indicate that water is lost in two major steps at 90-150 and 160-300 °C, with carbon dioxide coming off simultaneously at the second step at 200-300 °C. Further loss of CO 2 was also observed at about 550-560 °C and 735-765 °C due to decomposition of carbonate chemically bound to layer Zn 2+ and Al 3+ cations, respectively. These two steps are attributed to dehydration and dehydroxylation/decarbonation, respectively. The temperature of dehydration was found to increase linearly with increase in the moles of zinc in the takovite formula. In contrast, the temperature of dehydroxylation/decarbonation decreases almost linearly with increase in zinc composition from Ni 5 Zn 1 hydrotalcite. These observations are discussed in terms of the effects of stabilisation of the layer structure, the electronegativity of the layer metals, the charge-to-size ratio of the layer cations and the layer-interlayer hydrogen bonding interactions. Chemical reactions are proposed for the decomposition of the synthesised takovite and zinc-substituted hydrotalcites.

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“…For example, hydrotalcites may be used as a component in nano-materials such as nano-composites. 8 They are also important in the removal of environmental hazards in acid mine drainage. 9,10 Coincidently, their formation offers a mechanism for the management of hazardous chemical and radioactive waste or a means of heavy metal removal from contaminated waters.…”

Section: Introductionmentioning

confidence: 99%

²⁷Al Solid-state NMR Structural Studies of Hydrotalcite Compounds Calcined at Different Temperatures

Park

Choi²,

Kim³

2009

Bulletin of the Korean Chemical Society

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Hydrotalcites are anionic clays that are quite prevalent in nature and their importance is growing more and more because of their very wide range of potential applications and uses. Understanding the structural and compositional changes that occur on the molecular scale during the thermal decomposition of hydrotalcite compounds is essential for the basic prediction and comprehensive understanding of the behavior and technical application of these materials. In this study, several hydrotalcite compounds calcined at different temperatures for applications in a chlorine resistant textile were prepared and 27-Aluminm solid-state nuclear magnetic resonance (NMR) spectroscopy was used as a tool to study their local structure and behavior. The changes in the Al coordination of the hydrotalcite compounds were investigated with one dimensional (1D) solid-state magic angle spinning (MAS) NMR spectroscopy. The two broad resonances arising from the structurally different Al coordinations of these compounds were clearly resolved by two dimensional (2D) triple quantum magic angle spinning (3QMAS) NMR spectroscopy.

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Thermal Characterization of Poly(Styrene Sulfonate)/Layered Double Hydroxide Nanocomposites

Cited by 82 publications

References 35 publications

Layered double hydroxide-like materials: nanocomposites for use in concrete

Layered double hydroxide-like materials: nanocomposites for use in concrete

Thermogravimetric analysis of hydrotalcites based on the takovite formula NixZn6-xAl2(OH)16(CO3)·4H2O

²⁷Al Solid-state NMR Structural Studies of Hydrotalcite Compounds Calcined at Different Temperatures

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Thermal Characterization of Poly(Styrene Sulfonate)/Layered Double Hydroxide Nanocomposites

Cited by 82 publications

References 35 publications

Layered double hydroxide-like materials: nanocomposites for use in concrete

Layered double hydroxide-like materials: nanocomposites for use in concrete

Thermogravimetric analysis of hydrotalcites based on the takovite formula NixZn6-xAl2(OH)16(CO3)·4H2O

27Al Solid-state NMR Structural Studies of Hydrotalcite Compounds Calcined at Different Temperatures

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²⁷Al Solid-state NMR Structural Studies of Hydrotalcite Compounds Calcined at Different Temperatures