Intercalation of n-alkylamines by lamellar materials of the α-zirconium phosphate type

Menéndez, Fe; Espina, Aránzazu; Trobajo, Camino; Rodrı́guez, Julio

doi:10.1016/0025-5408(90)90130-t

Cited by 46 publications

(34 citation statements)

References 17 publications

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“…This trend continues for C8 (Figure c, and Table S1 and Figure S6, green curve, Supporting Information), where the swelling of the individual layer diverges even more with time: 1 and 2 start to grow immediately, while 3 starts at 280 s, 4 at 470 s, and 5 at 840 s. Similar to the previous systems, the swelling procedure is not finished after the initial 40 nm growth of the layers, but the layers collectively grow more, and a total layer swelling of all individual layers of ≈60–72 nm at a saturation time of 92 min is reached. These values fit well with the trends of the previously reported systems . An interesting finding is that the final layer thicknesses reach a common value for the C4 case (31 nm), but they show a small deviation of 9 and 12 nm for the larger amines, C6 and C8, respectively.…”

supporting

confidence: 91%

“…We use primary straight‐chain amines, which interact strongly with the interlayer protons of the solid acid H 3 Sb 3 P 2 O 14 , forming ammonium ions in an acid‐base reaction . The amines are thus trapped in the interlayer space, causing the NS layers to swell to a different extent depending on their molecular size . This layer swelling, consistent with changes in the d ‐spacing, translates into structural color changes, which can be detected with conventional optical methods.…”

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confidence: 99%

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Tracking Molecular Diffusion in One‐Dimensional Photonic Crystals

2018

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The intuitive use, inexpensive fabrication, and easy readout of colorimetric sensors, including photonic crystal architectures and Fabry–Pérot interference sensors, have made these devices a successful commercial case, and yet, understanding how the diffusion of analytes occurs throughout the structure is a key ingredient for designing the response of these platforms on demand. Herein, the diffusion of amines in a periodic multilayer system composed of two‐dimensional nanosheets and dielectric nanoparticles is tracked by a combination of spectroscopic measurements and theoretical modelling. It is demonstrated that diffusion is controlled by the molecular size, with larger molecules showing larger layer swelling and slower diffusion times, which translates into important sensor characteristics such as signal change and saturation time. Since the approach visualizes the analyte impregnation process in a time‐ and spatially resolved fashion, it directly relates the macroscopic color readout into microscopic processes occurring at the molecular level, thus opening the door to rational sensor design.

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confidence: 99%

Tracking Molecular Diffusion in One‐Dimensional Photonic Crystals

2018

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“…In the case of OTiP, one degradation step from 50 to 500°C is seen, which should be a complex trace of ethylamine and water 54–55. The weight loss amount is 36 wt% and the molecular formula of OTiP can be assumed as Ti(HPO 4 ) 2 ·2(CH 3 CH 2 NH 2 )·H 2 O 54, 72. So, the surface of OTiP nano‐sheets is covered by ethylamine, increasing the compatibility in PP matrix due to the natural affinity of ethyl group in ethylamine with PP molecule chains.…”

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confidence: 99%

Preparation and characterization of flame‐retardant polypropylene/α‐titanium phosphate (nano)composites

Bao

Song

Guo

et al. 2011

Polymers for Advanced Techs

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Polymer/α‐titanium phosphate (nano)composites are reported for the first time in this paper. The α‐titanium phosphate was synthesized via the hydrothermal method and organically modified by ethylamine intercalation. Flame retardant polypropylene/α‐titanium phosphate (nano)composites were prepared by melt blending. The titanium phosphates and (nano)composites were characterized and enhanced thermal stability, flame retardancy, and mechanical properties were obtained. Thermogravimetric analysis results showed an increase of 65°C in the maximum decomposition temperature and a 34% reduction in the peak value of derivative weight curve, demonstrating enhanced thermal stability. Improved mechanical properties, including elongation at break (70%), impact strength (29%), Young's modulus (11%), and hardness (35%), were obtained. Materials flame retardancy was also improved according to limiting oxygen index and vertical burning test. Probable mechanism for (nano)composites properties enhancements are discussed. Copyright © 2011 John Wiley & Sons, Ltd.

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“…Similar behaviour has been observed for α-MP compounds (M ϭ Zr, Ti, Hf). [21] Tentative formulae for the intercalates were determined from elemental analysis and TG data, assuming that in all cases the final product of thermal transformations is ZrO 2 and that the change in weight is only due to amine and water losses and to γ-ZrAs decomposition with As 2 O 5 release. Carbon and nitrogen contents, the total weight losses at 800°C, and the tentative formulae of the intercalates are compiled in Table 4.…”

Section: Resultsmentioning

confidence: 99%

Crystal Structure and Intercalation Properties of γ-Zr(AsO4)(H2AsO4) × 2 H2O

Rodrı́guez¹,

Suárez

Rodríguez

et al. 1999

Eur. J. Inorg. Chem.

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The crystalline structure of γ‐Zr(AsO4)(H2AsO4) × 2 H2O (γ‐ZrAs) has been refined by the Rietveld method. It has a monoclinic P21 layered structure built up from AsO4 tetrahedra and ZrO6 octahedra stacked along the 001 direction. The cell parameters are: a = 5.5752(6) Å, b = 6.8290(7) Å, c = 12.110(1) Å, and β = 103.03(1)°. The layered nature of γ‐ZrAs is confirmed by the intercalation of n‐alkylamines (CH3[CH2]nNH2; n = 0–5) as well as of cyclic amines (benzylamine, cyclohexylamine, piperidine, and pyridine). Among the linear amines, only with methyl‐, ethyl‐, and hexylamine is the maximum incorporation attained. With the cyclic amines, except in the case of pyridine, pure new phases are obtained, with the highest degree of intercalation being one mol of amine per mol of γ‐ZrAs.

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Intercalation of n-alkylamines by lamellar materials of the α-zirconium phosphate type

Cited by 46 publications

References 17 publications

Tracking Molecular Diffusion in One‐Dimensional Photonic Crystals

Tracking Molecular Diffusion in One‐Dimensional Photonic Crystals

Preparation and characterization of flame‐retardant polypropylene/α‐titanium phosphate (nano)composites

Crystal Structure and Intercalation Properties of γ-Zr(AsO4)(H2AsO4) × 2 H2O

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