Near-IR study of the impact of alkyl-ammonium and -phosphonium cations on the hydration of montmorillonite

Slaný, Michal; Jankovič, Ľuboš; Madejová, Jana

doi:10.1016/j.molstruc.2022.132568

Cited by 19 publications

(9 citation statements)

References 64 publications

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“…Moreover, the spectrum of PTB3 fully portrays the characteristic peaks confirming its formation, notably, the C−H stretching as well as the bending vibrations of aliphatic groups at 2950 and 1466 cm −1 and the aromatic C−H bending vibrations at 841 cm −1 . 49 The absorption band at 1266 cm −1 , which is attributed to the C−N stretching vibration of Troger's base units, 50 further validates the successful synthesis of PTB3. It is worthwhile to note that PTB1 and PTB2 disclose their respective characteristic peaks, which confirms their successful formation too (Figures S14−S16 of the Supporting Information).…”

Section: Resultsmentioning

confidence: 92%

“…The comparative FTIR absorption spectra (Figure ) clearly unveil the lack of two distinctive bands seen in synthons DBP and TB2 , specifically, the stretching vibration of C–Br in DBP , which is detected at 660 cm –1 , and the acetylene (CC) stretching vibration in TB2 , which is observed at 2195 cm –1 , from the absorption observed in FTIR of PTB3 . Moreover, the spectrum of PTB3 fully portrays the characteristic peaks confirming its formation, notably, the C–H stretching as well as the bending vibrations of aliphatic groups at 2950 and 1466 cm –1 and the aromatic C–H bending vibrations at 841 cm –1 . The absorption band at 1266 cm –1 , which is attributed to the C–N stretching vibration of Tröger’s base units, further validates the successful synthesis of PTB3 .…”

Section: Resultsmentioning

confidence: 92%

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Tröger’s Base-Enriched Conjugated Cyclopentannulated Copolymers: Prominent Adsorbents of CO₂, H₂, and Iodine

Shetty,

Baig,

Sengupta

et al. 2024

ACS Appl. Mater. Interfaces

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Three copolymers with conjugated structures, PTB1−PTB3, were produced utilizing a palladium-catalyzed cyclopentannulation polymerization by reacting a specially designed diethynyl Troger's base surrogate with different dihalogenated polycondensed aromatic hydrocarbons. Brunauer, Emmet, and Teller nitrogen gas adsorption investigation revealed the surface areas of the copolymers, attaining ∼365 m 2 g −1 . Gas uptake studies demonstrated a considerable carbon dioxide uptake for PTB2 of 44.41 mg g −1 at 273 K and a promising H 2 gas uptake of 3.18 mg g −1 at 77 K. PTB1− PTB3 displayed a sizable iodine adsorption capacity, achieving 4000 mg g −1 , and mechanistic investigations demonstrated the prevalence of a pseudosecond-order kinetic model. Recyclability experiments proved the effective regeneration of the copolymers, even after performing several adsorption and desorption tests.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 92%

Tröger’s Base-Enriched Conjugated Cyclopentannulated Copolymers: Prominent Adsorbents of CO₂, H₂, and Iodine

Shetty,

Baig,

Sengupta

et al. 2024

ACS Appl. Mater. Interfaces

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“…The peak observed at 3275 cm -1 is attributed to the vibration of the (-NH 2 ) amino groups (amide A) 40 . The bands at 2961 and 2924 cm -1 are associated with asymmetric stretching vibrations of the CH 3 and CH 2 functional groups, respectively 41 , 42 . The peak near 1628 cm -1 is assigned to the O–H vibration mode due to bound water (amide i) 43 .…”

Section: Resultsmentioning

confidence: 99%

Physicochemical and thermomechanical performances study for Timahdite sheep wool fibers application in the building's insulation

Atbir

Taïbi

Aouan

et al. 2023

Sci Rep

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The present research focuses on the development and thermomechanical characterization of unfired solid bricks based on clay (white and red) and Timahdite sheep wool, which are local, durable, abundant, and economical materials. As this clay material is incorporated with sheep wool in the form of yarn multi-layers in opposite directions. It achieves good thermal and mechanical performance and a lightness of these bricks as acquired progress. This new method of reinforcement offers significant thermo-mechanical performance for the composite for thermal insulation in sustainable buildings. Several physicochemical analyses to characterize the raw materials were used. Thermomechanical measurements to characterize the elaborated materials. The wool yarn effect was significant on the mechanical behavior of the developed materials at 90 days, with flexural strength from 18 to 56% for the white clay. And 8–29% for the red one. Decrease in compressive strength from 9 to 36% for the white clay and 5–18% for the red one. These mechanical performances are accompanied by thermal conductivity gain ranging from 4 to 41% for the white and 6–39% for the red for wool fractions: 6–27 g. This green multi-layered bricks from abundant local materials with optimal thermo-mechanical properties, qualified for the intended use for thermal insulation and energy efficiency in the construction and development of local economies.

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“…After APAM modification, the peak around 3440 cm −1 becomes broader, which may be caused by the asymmetric stretching vibration of -NH 2 . The new peaks at 2950 cm −1 and 2858 cm −1 are stretching vibration peaks of -CH 3 and -CH 2 , respectively [ 35 , 36 ]. The absorption band intensity increases at 1638 cm −1 , which is related to the stretching vibration of C=O and the bending vibration of -NH 2 .…”

Section: Resultsmentioning

confidence: 99%

Study on Preparation of Polymer-Modified Bentonite and Sand Mixtures Based on Osmotic Pressure Principle

Zhang

et al. 2022

Materials

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Polymer-modified bentonite and sand mixtures (PMBS) are widely used in the engineering field due to their low cost and low permeability. In this study, different ionic types of polyacrylamides were used to modify bentonite to improve its swelling properties and impermeability. The physicochemical properties of polymer-modified bentonite were characterized by X-ray diffraction, particle size distribution, IR spectroscopy, SEM, and free swell index (FSI) to further demonstrate the successful organic modification of bentonite. To investigate the impermeability mechanism of PMBS from the perspective of osmotic pressure, the colloidal osmotic pressure of bentonite and hydraulic conductivity were compared. The results showed that anionic polyacrylamide (APAM) had the most obvious improvement on the swelling properties of bentonite, and 3% APAM increased the FSI of bentonite from 15 mL/2 g to 41 mL/2 g. With the increase in polymer dosage, the colloidal osmotic pressure of bentonite increased and the hydraulic conductivity of PMBS decreased significantly. The interior of PMBS is equivalent to a highly concentrated bentonite–sand–water system. When the colloidal osmotic pressure in the restricted space is higher than the external hydraulic pressure, it will prevent infiltration from occurring. When the external hydraulic pressure exceeds the high concentration of bentonite colloid osmotic pressure, the hydraulic conductivity may increase rapidly. Therefore, the impermeability of PMBS depends on the colloidal osmotic pressure of bentonite. Finally, it was confirmed that PMBS had a self-healing capacity by simulating damage to PMBS.

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Near-IR study of the impact of alkyl-ammonium and -phosphonium cations on the hydration of montmorillonite

Cited by 19 publications

References 64 publications

Tröger’s Base-Enriched Conjugated Cyclopentannulated Copolymers: Prominent Adsorbents of CO₂, H₂, and Iodine

Tröger’s Base-Enriched Conjugated Cyclopentannulated Copolymers: Prominent Adsorbents of CO₂, H₂, and Iodine

Physicochemical and thermomechanical performances study for Timahdite sheep wool fibers application in the building's insulation

Study on Preparation of Polymer-Modified Bentonite and Sand Mixtures Based on Osmotic Pressure Principle

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Near-IR study of the impact of alkyl-ammonium and -phosphonium cations on the hydration of montmorillonite

Cited by 19 publications

References 64 publications

Tröger’s Base-Enriched Conjugated Cyclopentannulated Copolymers: Prominent Adsorbents of CO2, H2, and Iodine

Tröger’s Base-Enriched Conjugated Cyclopentannulated Copolymers: Prominent Adsorbents of CO2, H2, and Iodine

Physicochemical and thermomechanical performances study for Timahdite sheep wool fibers application in the building's insulation

Study on Preparation of Polymer-Modified Bentonite and Sand Mixtures Based on Osmotic Pressure Principle

Contact Info

Product

Resources

About

Tröger’s Base-Enriched Conjugated Cyclopentannulated Copolymers: Prominent Adsorbents of CO₂, H₂, and Iodine

Tröger’s Base-Enriched Conjugated Cyclopentannulated Copolymers: Prominent Adsorbents of CO₂, H₂, and Iodine