Organic-inorganic hybrid layer-by-layer electrostatic self-assembled film of cationic dye Methylene Blue and a clay mineral: Spectroscopic and Atomic Force microscopic investigations

Chakraborty, Utsav; Singha, Tanmoy; Chianelli, Russell R.; Hansda, Chaitali; Paul, Piyali

doi:10.1016/j.jlumin.2017.03.039

Cited by 31 publications

(12 citation statements)

References 57 publications

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“…S7, † MB has a heteroatomic structure and it tends to form face-to-face dimers through stacking interactions to minimize their hydrophobic interactions with water. 41 At high pH, MB cations start to loose positive charges, which increases their aggregation. Furthermore, the self-organization of MB aggregates is promoted by forces such as dispersion forces due to the interaction between p-systems of the MB and hydrophobic forces of the polyanion.…”

Section: Effects Of Initial Solution Phmentioning

confidence: 99%

Polymer-grafted magnetic microspheres for enhanced removal of methylene blue from aqueous solutions

Zheng

et al. 2017

RSC Adv.

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Section: Effects Of Initial Solution Phmentioning

confidence: 99%

Polymer-grafted magnetic microspheres for enhanced removal of methylene blue from aqueous solutions

Zheng

et al. 2017

RSC Adv.

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“…Polyelectrolyte complexes (PECs) are the product of strong interactions between oppositely charged macromolecules and the release of entropic counterions in a solution. − PEC morphologies range from solid-like (polyelectrolyte complexes) to liquid-like (polyelectrolyte coacervates) , and are affected by assembly conditions (e.g., polyelectrolyte concentration, ionic strength and salt type, polyelectrolyte type and molecular weight, etc. ), as well as posttreatment conditions. − Consequently, PEC physical properties have proven to be affected by water content, salt, and pH. − This enables PECs for several applications including humidity sensors, , adhesives, self-healing materials, − and mechanically adaptive materials .…”

Section: Introductionmentioning

confidence: 99%

Time–Temperature and Time–Water Superposition Principles Applied to Poly(allylamine)/Poly(acrylic acid) Complexes

Suarez-Martinez

Batys

Sammalkorpi³

et al. 2019

Macromolecules

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The dynamic mechanical and rheological behavior of polyelectrolyte coacervates and complex precipitates is of interest for many applications ranging from health to personal care. Hydration is an important factor, but its effect on the dynamic properties of polyelectrolyte complexes (PECs) is poorly understood. Here, we describe the dynamic behavior of poly(allylamine hydrochloride) (PAH) and poly(acrylic acid) (PAA) complex precipitates at varying relative humidity values and temperatures using both dynamic mechanical analysis (DMA) and all-atom molecular dynamics simulations. To mirror the experimental system via simulation, the water content within the PEC is measured and used as the parameter of interest, rather than relative humidity. In experimental DMA, modulus decreases with both increasing water content and temperature. The data are superimposed into a super-master hydrothermal curve using the time-temperature superposition principle and the time-water superposition principle for the first time. The temperature-dependent shift factor (aT) follows an Arrhenius relation, and the water-dependent shift factor (aw) follows a log-linear relation with water content in the complex. These results suggest that both temperature and water affect the dynamics of the PEC by similar mechanisms over the range investigated. Allatom molecular dynamics simulations show that an increase in water content and temperature lead to similar changes in polyelectrolyte chain mobility with little effect on the number of intrinsic ion pairs, suggesting the validity of time-water and time-temperature supposition principles.

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“…The harmful effects of MB on human beings manifest themselves as the dose exceeds 2 mg/kg. The removal of MB from aqueous solutions by clay minerals, particularly those belonging to the smectite group, has been studied extensively (Cottet et al , 2014; Ranđelović et al , 2014; Chang et al , 2016; Chakraborty et al , 2017). However, few investigations have been carried out on the adsorption of MB by stevensite (Bouna et al , 2010).…”

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confidence: 99%

Adsorption capacity of sodic- and dendrimers-modified stevensite

et al. 2018

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The adsorption capacities of nano-sized organoclays composed of a stevensite-rich clay (R), phosphorus dendrimers (GC1 and GC2) and Na+-saturated clay were evaluated for their capacity to adsorb chromate and methylene blue (MB) in the range of 298–318 K. The adsorption kinetics and the isotherms were analysed based on kinetic equations and isotherm models and by adopting a non-linear regression procedure. In addition, the organoclays and the Na+-saturated clays were characterized principally by solid-state nuclear magnetic resonance spectroscopy. The pseudo-second-order rate equation described kinetics data well, and the adsorption rates were not limited by the intraparticle diffusion or by the liquid film diffusion. Both chemical species were adsorbed spontaneously (–31 < ΔG°T< –10 kJ/mol), but the adsorbents had a high affinity for MB species. The adsorption isotherms of chromate were fitted better by the Freundlich model, while those of MB followed the Langmuir model. Chromate adsorption took place at the edges and the free surfaces of stevensite, particularly at the protonated aluminols. MB was adsorbed as MBH2+ and MB+. The MB protonation occurred at the clay surfaces, and MB+ ions were located at the planar surfaces of stevensite as well as at the external surfaces of aggregates. Moreover, the tetrahedral sheet of stevensite involved in the formation of GC1-based organoclays was the subject of a partial chemical modification.

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Organic-inorganic hybrid layer-by-layer electrostatic self-assembled film of cationic dye Methylene Blue and a clay mineral: Spectroscopic and Atomic Force microscopic investigations

Cited by 31 publications

References 57 publications

Polymer-grafted magnetic microspheres for enhanced removal of methylene blue from aqueous solutions

Polymer-grafted magnetic microspheres for enhanced removal of methylene blue from aqueous solutions

Time–Temperature and Time–Water Superposition Principles Applied to Poly(allylamine)/Poly(acrylic acid) Complexes

Adsorption capacity of sodic- and dendrimers-modified stevensite

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