Ultrasound assisted solvent free intercalation of montmorillonite with PEG1000: A new type of organoclay with improved thermal properties

Önder, Emel; Sarıer, Nihal; Ukuser, Gokcen; Ozturk, M. Kucukali; Arat, Refik

doi:10.1016/j.tca.2013.05.021

Cited by 36 publications

(18 citation statements)

References 58 publications

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“…These findings, i.e. the changes in wavenumbers and intensity of these bands, accordingly to the literature suggestions Onder et al 2013;Sarier et al 2011) could indicate partial displacement of water molecules as a consequence of the TW20 chains entering the montmorillonite galleries. Thus, we can draw the conclusion that the FT-IR trends further support the above proposed intercalation mechanism of TW20 into the galleries of K10-MMT on the base of the results obtained with the others complementary techniques.…”

Section: Ft-ir Characterizationsupporting

confidence: 88%

“…Moreover, a decrease in frequency of the broad band in the 3400 cm -1 region of the hybrids FTIR spectra (associated to the overlapping symmetrical stretching vibrations of both structural and free OH groups) has been obtained. This shift has been previously (Onder et al 2013) ascribed to the bonding of CH 2 -(CH 2 -O-CH 2 )-CH 2 chains with the Si-O-Si and Al-O-Al sites. In the same way, the band associated to the OH bending vibrations at 1636 shifted to 1640 cm -1 in the organoclays and decreased in intensity.…”

Section: Ft-ir Characterizationmentioning

confidence: 60%

“…The presence of broad bands at 3430-3626 cm -1 derives from the stretching vibration of OH bond, more precisely, the band at 3626 cm -1 is characteristic of the structural O-H stretching whereas those at 3430 and 636 cm -1 are ascribed to the stretching and bending vibration Onder et al 2013) of the OH groups of the adsorbed water, respectively.…”

Section: Ft-ir Characterizationmentioning

confidence: 99%

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Preparation and characterization of bio-organoclays using nonionic surfactant

et al. 2015

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The present study was aimed at the preparation and characterization of tailor made hybrid materials, whose peculiar hosting capability could be exploited in biotechnological applications. With this purpose, the modification of K10 montmorillonite by intercalation of Tween 20 surfactant, was accomplished. The influence of two internal parameters, namely pH and surfactant/clay ratio, on the surfactant uptake ability by clay was investigated. The adsorption mechanism was elucidated on the basis of complementary kinetic and equilibrium studies and, then, corroborated by the useful information provided by the FT-IR, TGA and XRD characterization. The gathered results allow to draw the conclusion that the whole surfactant uptake is the result of two contributions: a site-limiting component, governed by negative cooperative interactions, which takes into account for the Tween 20 adsorption onto the pristine clay, and a non-specific linear partitioning component, related to the adsorption of the surfactant onto the in situ prepared organo-clay. Moreover, at strongly acidic pH, a mechanism consisting of two-steps pathways involving two non-energetically equivalent binding sites of the clay surfaces, was proposed, while, on increasing the pH, the clay interlayer becomes the sole available site for the surfactant uptake. In the light of the interesting results obtained, among the plethora of potential biotechnological applications, the present paper suggests the exploitation of the prepared organo-clays to improve the performance of either hydrophilic or hydrophobic drug carriers systems

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Section: Ft-ir Characterizationsupporting

confidence: 88%

Section: Ft-ir Characterizationmentioning

confidence: 60%

Section: Ft-ir Characterizationmentioning

confidence: 99%

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Preparation and characterization of bio-organoclays using nonionic surfactant

et al. 2015

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“…4). To interpret the FT-IR spec- tra, the absorption peaks were compared with the standard FT-IR patterns [36][37][38][39]. The asymmetric stretching band of the structural OH groups of the modified nanoclay sample appeared at 3,642 cm −1 [13,36,40].…”

Section: -4 Ft-ir Resultsmentioning

confidence: 99%

“…They broadened considerably in the spectra of the dye-loaded modified nanoclay. It could be attributed to the alteration of silica and alumina layers due to the presence of organic chains causing the intercalation of the dye molecules [39]. The shift of bands belonging to Si-O and all -OH vibrations and/or the change in their intensities implied the presence of strong electrostatic interactions and, also, the hydrogen bonds between dye molecules and these functional groups.…”

Section: -4 Ft-ir Resultsmentioning

confidence: 99%

Ultrasound-assisted adsorption of textile dyes using modified nanoclay: Central composite design optimization

Hassani

Soltani

Kıranşan

et al. 2015

Korean J. Chem. Eng.

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The removal of two anionic dyes, C.I. Acid Orange 7 (AO7) and C.I. Acid Red 17 (AR17), by ultrasoundassisted adsorption on the modified nanoclay in aqueous solutions was studied. The modified nanoclay was characterized by SEM/EDX, BET, XRD and FT-IR techniques. The average crystal size for the interlayer spacing of the modified nanoclay was about 14.3 nm. Central composite design (CCD) was used for the optimization of the operational parameters, including the initial dye concentration, sonication time, adsorbent dosage and temperature. The results demonstrated a good agreement between the predicted values obtained by the model and the experimental values for both AO7 (R 2 = 0.959) and AR17 (R 2 =0.971).

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Thermal and Mechanical Robust Solid‐Solid Phase Change Materials Enabled by Reactive Crosslinkable Poly(Ethylene Glycol)s via Facile Thiol‐Ene Photo‐Click Chemistry

Wang,

Zhang

2024

Adv Funct Materials

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Solid–solid phase change materials (SSPCMs) are among the most promising candidates for thermal energy storage and management. Excellent shape stability, high heat storage capacity, and satisfying mechanical properties are essential for the practical applications of SSPCMs, yet giving PCMs these characteristics at the same time remains an unmet challenge. Herein, the synthesis of PEG‐PVEG copolymers is reported with various vinyl content using a synergistic catalysis strategy, leading to novel cross‐linked PEG‐based SSPCMs via a thiol‐ene photo‐crosslinking reaction. These PCMs exhibit excellent shape stability and remarkable energy storage capabilities with latent heat up to 128.3 J g−1. The materials exhibit exceptional thermal stability and retain their energy storage capacity after 500 heating‐cooling cycles. Notably, the materials show superior mechanical strength and excellent toughness. Furthermore, the latent heat enthalpy can be further improved to 146.8 J g−1 without erosion of shape stability by the encapsulation of PEG into present SSPCM. The enhancement of both thermal and electrical conductivities is also demonstrated by the phase change composites (PCCs) incorporating multi‐walled carbon nanotubes (MWCNTs). Overall, this study presents a convenient and feasible strategy for developing SSPCMs with excellent shape stability, high latent heat and satisfying mechanical properties for thermal management.

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Ultrasound assisted solvent free intercalation of montmorillonite with PEG1000: A new type of organoclay with improved thermal properties

Cited by 36 publications

References 58 publications

Preparation and characterization of bio-organoclays using nonionic surfactant

Preparation and characterization of bio-organoclays using nonionic surfactant

Ultrasound-assisted adsorption of textile dyes using modified nanoclay: Central composite design optimization

Thermal and Mechanical Robust Solid‐Solid Phase Change Materials Enabled by Reactive Crosslinkable Poly(Ethylene Glycol)s via Facile Thiol‐Ene Photo‐Click Chemistry

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