Thermo-XRD-analysis of montmorillonite treated with protonated Congo-red. Curve fitting

Yermiyahu, Z.; Lapides, I.; Yariv, S.

doi:10.1016/j.clay.2005.03.002

Cited by 34 publications

(5 citation statements)

References 14 publications

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“…Peaks observed at 2θ = 18.8° and 22.5° are associated to cellulose I amorphous and crystalline structure, respectively. , Based on the difference of their intensity and according to the Buschle-Diller and Zeronian equation, the crystallinity index of CNF was obtained as 58%. In the MMT pattern, reflections of 7.7° (characteristic of the tactoids planar monolayer) and 19.6° corresponding to silicates were observed , which used to trace the presence of MMT in the CNF film (Figure c). The shift of silicate (2θ = 7.7°) to a lower angle (2θ = 6.9°) is an indication of an increased interlayer distance due to the intercalation as in CNF–MMT nanocomposites …”

Section: Resultsmentioning

confidence: 99%

Sustainable Barrier System via Self-Assembly of Colloidal Montmorillonite and Cross-linking Resins on Nanocellulose Interfaces

Tayeb

Tajvidi

2018

ACS Appl. Mater. Interfaces

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Cellulose nanofibrils (CNFs) are able to form strong oxygen-barrier films suitable for food packaging but lack the needed water resistance in comparison to plastics. Desired water barrier quality can be achieved by applying mineral additives within the nanofibrils network. In current contribution, a sustainable hybrid system with an improved water barrier function is proposed by incorporating colloidal montmorillonite nanoclay (MMT) and two cross-linking agents, namely, polyamidoamine epichlorohydrin (PAE) and Acrodur thermoset acrylic resin (ACR) into CNF interfaces. Continuous matrices were produced via evaporation-induced self-assembly of colloidal building blocks followed by appropriate heat-curing regime to impart internal cross-linking. The development of chromophore functionalities and formation of ester motifs on the hybrid matrix (with no evidence of degradation) were detected by Fourier-transform infrared (FT-IR) spectroscopy. Intercalation of clay, solely, reduced the water vapor transmission rate (WVTR) to some extent; however, a more remarkable decline (by 60%) was observed upon the curing and cross-linking process. In fact, combination of clay platelets and cross-linkers contributed to a denser film structure and restricted water passage. Also, an excellent resistance to oil and grease was observed in all the studied films (Kit number of 11). A reduction in tensile strengths and resistance to cracking at fold was noted and ascribed to MMT interference in cellulose interchain hydrogen bonds. This however was counteracted by the introduction of cross-linkers, apparently by aiding stress transfer within the matrix. MMT imparted a limited elevation in the surface free energy, pointing out to an induced hydrophilicity; however, surface energy values declined markedly upon using cross-linkers. Finally, thermal stability of hybrids was adversely affected, compared to neat CNFs. Our study suggests the potential utilization of low-cost, sustainable biobarrier films for application in food/drug packaging, where low permeation of moisture is highly desirable.

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Section: Resultsmentioning

confidence: 99%

Sustainable Barrier System via Self-Assembly of Colloidal Montmorillonite and Cross-linking Resins on Nanocellulose Interfaces

Tayeb

Tajvidi

2018

ACS Appl. Mater. Interfaces

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“…For the AA/LDHs/CR composite film, CR molecular anions form a head-to-tail J-aggregate and have a tilt angle of 31.3 • with respect to the sheet surface. This means that CR most probably lie flat on the sheet surface in the galleries with their long axis and the two SO − 3 groups of one CR molecular anion may bind with the same side or opposite sides of the LDHs gallery, as reported for the CR and montmorillonite clay system [53].…”

Section: Polarized Uv-vis Absorption Spectramentioning

confidence: 89%

Study of assembly of arachidic acid/LDHs hybrid films containing photoactive dyes

Wang¹,

Ren²,

Feng³

et al. 2008

Journal of Colloid and Interface Science

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“…Changes in the interlayer distance caused by ion-exchange of cationic surfactant, as determined by SAXS measurements, have been reported [26]. Variation of the d-spacing has been previously reported as a function of the initial surfactant concentration [5].…”

Section: The Organization Of Amps In the Clay Galleriesmentioning

confidence: 95%

Adsorption of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and related compounds onto montmorillonite clay

Greesh

Hartmann

Cloete

et al. 2008

Journal of Colloid and Interface Science

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Thermo-XRD-analysis of montmorillonite treated with protonated Congo-red. Curve fitting

Cited by 34 publications

References 14 publications

Sustainable Barrier System via Self-Assembly of Colloidal Montmorillonite and Cross-linking Resins on Nanocellulose Interfaces

Sustainable Barrier System via Self-Assembly of Colloidal Montmorillonite and Cross-linking Resins on Nanocellulose Interfaces

Study of assembly of arachidic acid/LDHs hybrid films containing photoactive dyes

Adsorption of 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) and related compounds onto montmorillonite clay

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