Chemical modification of zinc hydroxide nitrate and Zn–Al-layered double hydroxide with dicarboxylic acids

Arízaga, Gregório Guadalupe Carbajal; Mangrich, Antônio S.; Gardolinski, José Eduardo Ferreira da Costa; Wypych, Fernando

doi:10.1016/j.jcis.2007.12.038

Cited by 82 publications

(69 citation statements)

References 18 publications

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“…Also, the basal distance did not change with changes in the Zn/Al ratio, indicating that chloride ions are the only species responsible to keep the layers separated from each other. On the other hand, LDHs prepared with nitrate or carbonate ions presented a basal distance of 8.9 and 7.4 Å , respectively, which were also in good agreement with the presence of these ions in the interlayer space [17][18][19]. This included the LDH of the Mg/Al series (Mg 2 AlNO 3 , Fig.…”

Section: Characterization Of Layered Double Hydroxides (Ldhs)mentioning

confidence: 62%

LDHs Instability in Esterification Reactions and Their Conversion to Catalytically Active Layered Carboxylates

et al. 2012

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Layered double hydroxides (LDH) containing Zn/Al and Mg/Al with different counter-ions and M 2? /M 3? ratios were synthesized and used as catalysts in the esterification of fatty acids with methanol. High conversion rates were obtained depending on the reaction conditions. However, LDHs were also converted in situ into layered carboxylates and this new material was responsible for the observed catalytic activity, which was preserved even after several consecutive reuse cycles.

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Section: Characterization Of Layered Double Hydroxides (Ldhs)mentioning

confidence: 62%

LDHs Instability in Esterification Reactions and Their Conversion to Catalytically Active Layered Carboxylates

et al. 2012

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“…The band at 1045 cm -1 corresponds to the N-O stretching vibration of a monodentate O-NO group, which is active in both, FT-IR and Raman spectra (see Figure 4), in good agreement with the literature. 22,26 The shoulder observed at 1375 cm -1 is also assigned to free nitrate ions in the interlamellar space. ).…”

Section: Resultsmentioning

confidence: 98%

Simple route for the synthesis of copper hydroxy salts

Aguirre

Gutiérrez

Giraldo

2011

J. Braz. Chem. Soc.

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“…The LHS are obtained when a fraction of the sites occupied by hydroxyl ions in the Brucite (Mg(OH) 2 ) structure is replaced by water molecules or anions. For the latter, ions of the second coordination sphere of the metal are required to stabilize the electrostatic charge [18] . For instance, the zinc hydroxide nitrate, general formula Zn 5 (OH) 8 (NO 3 ) 2 .2H 2 O, is a hydroxide salt in which the layers are comprised of zinc atoms octahedrally coordinated by hydroxyl anions and tetrahedrally coordinated to three hydroxyl anions and one water molecules, where the nitrate positioned between the layers is exchangeable [19] .…”

Section: Introductionmentioning

confidence: 99%

Zinc layered hydroxide salts: intercalation and incorporation into low-density polyethylene

et al. 2014

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Abstract:In this study, polymer composites using low-density polyethylene (LDPE) and layered hydroxide salts (LHS) were synthesized. The following compositions of LHS were obtained Zn 5 (OH) 8 (A n-) 2/n .yH 2 O, where A was varied in order to obtain hydrophilic (A = NO 3 -) or hydrophobic (A = DDS --dodecyl sulfate or DBS --dodecyl benzene sulfonate). Synthesis was carried out by co-precipitation in alkaline medium and drying, being followed by characterization via Fourier-transform infrared spectroscopy, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy. A variable amount of filler was then incorporated into the LDPE via extrusion, which was then injection molded to obtain specimens for evaluating tensile properties (Young's modulus, tensile strength, strain at break and toughness). For comparison, the sodium salts of the surfactants (NaDDS and NaDBS) were also used as fillers in LDPE. The X-ray diffraction results indicated that the hydrophobic LHS were exfoliated in the polymer matrix, whereas the hydrophilic LHS was only delaminated. In the LDPE composites, melting and crystallization temperatures were nearly constant, along with the crystallinity indexes. The mechanical properties were mainly varied when the organophilic LHS was used. Overall, fillers based on LHS, especially those containing hydrophobic anions, may be interesting alternatives in the production of reinforced thermoplastics.

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Chemical modification of zinc hydroxide nitrate and Zn–Al-layered double hydroxide with dicarboxylic acids

Cited by 82 publications

References 18 publications

LDHs Instability in Esterification Reactions and Their Conversion to Catalytically Active Layered Carboxylates

LDHs Instability in Esterification Reactions and Their Conversion to Catalytically Active Layered Carboxylates

Simple route for the synthesis of copper hydroxy salts

Zinc layered hydroxide salts: intercalation and incorporation into low-density polyethylene

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