Synthesis of Zn,Al layered double hydroxides in the presence of amines

Misol, Alexander; Labajos, F.M.; Morato, A.; Rives, V.

doi:10.1016/j.clay.2020.105539

Cited by 8 publications

(11 citation statements)

References 26 publications

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“…As it can be seen, the values calculated fit remarkably well with the real ones. The predictive ability of this method was tested for different samples (S1-S4) prepared in our laboratory [19] following the same method described above, but adding methyl, dimethyl, or trimethyl amine to the reaction medium, and then they were submitted to hydrothermal treatment. The data calculated from their corresponding PXRD diagrams are given in Table 4, where the results of the analysis are also included.…”

Section: Resultsmentioning

confidence: 99%

“…Cations such as Mg 2+ form almost exclusively compounds where the cations are in an octahedral environment, but other cations able also to form LDHs, such as Zn 2+ or Co 2+ , form stable compounds where the cations are in both octahedral or tetrahedral environments [15]- [17], and so such a segregation can be hardly avoided. This situation clearly exists in the case of Zn-Al LDHs which, upon submission to hydrothermal treatment (well under standard conditions or with microwave irradiation), segregate ZnO, where Zn 2+ cations are in a tetrahedral environment [18], [19].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantification by Powder X-ray Diffraction of Metal Oxides Segregation During Formation of Layered Double Hydroxides

Misol¹,

Jiménez²,

Morato³

et al. 2020

EJERS

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Quantification by Powder X-ray Diffraction of Metal Oxides Segregation During Formation of Layered Double Hydroxides

Misol¹,

Jiménez²,

Morato³

et al. 2020

EJERS

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“…As the synthesis method used was that of co-precipitation at constant pH, besides the drug and water molecules, there is also the existence of anion nitrate in the interlayer space, which is the source of starting salts 32,33 . However, other characteristic reflections of these materials were observed, particularly the diffraction plane (012) in intermediate values of angles at 2θ, which is related to the stacking pattern of the layers indicating a 3R polytype, where the parameter c was 6.72 and 6.96 nm for the Zn 2 Al-IBU and Zn 3 Al-IBU 33,34 .…”

Section: Ldhs Characterizationmentioning

confidence: 99%

“…The region between 1252 to 733 cm -1 is relative to the elongation of C-O bond and bend deformations of C-H aromatic rings bonds and the O-H bonds. And, the bands below 700 cm -1 can be interpreted as vibration modes of the layer network, such as M-OH and O-M-O stretching vibrations 34 . All vibrational modes observed in Figure 3 are summarized in Table S1 (supplementary material).…”

Section: Ldhs Characterizationmentioning

confidence: 99%

Ibuprofen Release from Hydrotalcite-like Materials Filled into Chitosan/Alginate Composites as Promising Reabsorbable Membranes

et al. 2021

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Hydrotalcite-type materials, or layered double hydroxide (LDH), are very promising in applying slow-release drug systems through ion exchange and delamination characteristics at acidic pH. In this paper, Zn/Al LDHs in 2:1 and 3:1 molar ratios intercalated with the drug ibuprofen (IBU) were added to chitosan/alginate membranes. In the release tests, an increase in the solubility of the drug in the membranes could be observed, and the percentage of drug release is lower than the percentage of drug release in the free samples. The following release percentages were obtained: 15.48% and 17.5% of the drug in water, and 23.22% and 26.25% of the drug in PBS buffer solution, respectively, for membrane samples containing Zn 2 Al-IBU and Zn 3 Al-IBU LDHs. Thus, the synthesized hybrid membranes (chitosan/alginate-LDH-IBU) are promising in the application as resorbable membranes for bone grafting with drug release.

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“…In our previous work [27], Zn/Al-LDH in molar ratio 2:1 was synthesized using amines with one carbon atom in the organic chain [methylamine (MMA), dimethylamine (DMA) and trimethylamine (TMA)], such as precipitant agents. Furthermore, the evolution on the properties caused by hydrothermal treatment of samples synthetized with amines using the following two ways of heating was studied: conventional heating and microwave assisted heating.…”

Section: Introductionmentioning

confidence: 99%

Use of Ethylamine, Diethylamine and Triethylamine in the Synthesis of Zn,Al Layered Double Hydroxides

2022

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Amines with two carbon atoms in the organic chain [ethylamine (EA), diethylamine (DEA), triethylamine (TEA)] have been used as precipitant agents to obtain a hydrotalcite-like compound with Zn (II) and Al (III) as layered cations and with nitrate anions in the interlayered region to balance the charge. This Layered Double Hydroxide was prepared following the coprecipitation method, and the effect on the crystal and particle sizes was studied. Also, the effect of submitting the obtained solids to hydrothermal post-synthesis treatment by conventional heating and microwave assisted heating were studied. The obtained solids were exhaustively characterized using several instrumental techniques, such as X-ray diffraction, Thermal Analysis (DTA and TG), Chemical Analysis, Infrared Spectroscopy (FT-IR), determination of Particle Size Distribution and BET-Surface area. Well crystallized solids were obtained showing two possible LDH phases, depending on the orientation of the interlayer anion with respect to the brucite-like layers. The results indicated that there is a certain influence of the amine, when used as a precipitating agent, and as a consequence of the degree of substitution, on the crystallinity and particle size of the final solid obtained. The LDHs obtained using TEA exhibited higher crystallinity, which was improved after a long hydrothermal treatment by conventional heating. Regarding the shape of the particles, the formation of aggregates in the former solid was detected, which could be easily disintegrated using ultrasound treatments, producing solid powder with high crystallinity and small particle size, with homogeneous size distribution.

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Synthesis of Zn,Al layered double hydroxides in the presence of amines

Cited by 8 publications

References 26 publications

Quantification by Powder X-ray Diffraction of Metal Oxides Segregation During Formation of Layered Double Hydroxides

Quantification by Powder X-ray Diffraction of Metal Oxides Segregation During Formation of Layered Double Hydroxides

Ibuprofen Release from Hydrotalcite-like Materials Filled into Chitosan/Alginate Composites as Promising Reabsorbable Membranes

Use of Ethylamine, Diethylamine and Triethylamine in the Synthesis of Zn,Al Layered Double Hydroxides

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