Exploring Langmuir-Blodgett technique to investigate effect of various subphase conditions on monolayers formed by amphiphilic block co-polymers tetronic 701 and tetronic 90R4

Roy, Dipali; Naskar, Bappaditya; Bala, Tanushree

doi:10.1016/j.colsurfa.2021.126924

Cited by 11 publications

(18 citation statements)

References 66 publications

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“…Some previous studies have shown that the films formed in subphase environments at high pH values have smooth and good regularity, while the films appear rough and distorted at low pH values. 51,63,68 Penacorada et al investigated monolayer surface collapse pressure and pressure-area curve inflection points at different pH values. 68 The pH-induced changes in the morphology of Langmuir films are mainly due to acid-salt conversion and the complex interaction of opposite ions in different pH environments.…”

Section: Key Factors Affecting the Controllable-assembly Processmentioning

confidence: 99%

“…Roy et al investigated the morphology and isotherms of tetronic 701 (T 701) and tetronic 90R4 (T 90R4) under different pH conditions. 63 They concluded that lower pH conditions lead to stronger protonation of the central ethylenediamine group of T 701 and T 90R4, which results in the central ethylenediamine group being attractive to the water subphase. As shown in Fig.…”

Section: Controllable-assembled-monolayer Concepts and Propertiesmentioning

confidence: 99%

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Controllable-assembled functional monolayers by the Langmuir–Blodgett technique for optoelectronic applications

Lin,

Zheng,

Zhong

et al. 2024

J. Mater. Chem. C

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Section: Key Factors Affecting the Controllable-assembly Processmentioning

confidence: 99%

Section: Controllable-assembled-monolayer Concepts and Propertiesmentioning

confidence: 99%

Controllable-assembled functional monolayers by the Langmuir–Blodgett technique for optoelectronic applications

Lin,

Zheng,

Zhong

et al. 2024

J. Mater. Chem. C

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“…Recently, Roy et al reported a detailed study of the Langmuir isotherms and Langmuir− Blodgett film properties of T701 and T90R4 by varying the temperature, pH, and ionic strength of the subphase. 50 These results were used for comparison in few cases here. In this work, instead of varying physical parameters, POMs were introduced in the subphase.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Detailed Study on the Interfacial Interaction between Different Polyoxometalates and Tetronic Block Copolymers Exploring the Langmuir–Blodgett Technique

Roy,

Naskar

et al. 2024

Langmuir

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Polyoxometalates (POMs) interact with various biologically relevant entities. A basic understanding of this interaction is very important for various applications in the biological field. In this work, the focus is on the study of the interaction between tetronics and Keggin POMs. T701 and T90R4 are the two tetronics considered here; they have different solubilities in water due to different PPO/PEO ratios. The arrangement of PPO and PEO is also different with respect to the central ethylenediamine groups. Three different Keggin-type POMs, phosphomolybdic acid (PMA), phosphotungstic acid (PTA), and silicotungstic acid (STA), with different charge densities are chosen for an elaborate investigation using Langmuir−Blodgett technique. The observation is analyzed thoroughly, which shows both electrostatic interaction and adsorption of POMs on the PPO blocks of the tetronics due to the chaotropic effect, which is responsible for the binding of POMs (in subphase) with the tetronic monolayer. This interaction results in an expanded yet rigid monolayer for POM−tetronic association on the surface. Surface pressure vs mean molecular area isotherm is the key characterization to reach the conclusion. UV−vis spectroscopy, NMR, ITC, ellipsometric studies, FTIR, and SEM also serve as supportive characterization techniques.

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“…Structural diversity and pH−temperature responsiveness make tetronic aggregates a superior nanocarrier in comparison to pluronics. 1,5,6 Hydrophobicity of a specific tetronic depends upon its PPO/PEO ratio. Accordingly, T1304 carrying 40% PEO is more hydrophobic than T1307.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Unlike their linear counterparts, the diamine moiety (p K a 1 = 7.5–8.1, and p K a 2 = 4–5.6) confers pH responsiveness to the tetronics. Structural diversity and pH–temperature responsiveness make tetronic aggregates a superior nanocarrier in comparison to pluronics. ,, …”

Section: Introductionmentioning

confidence: 99%

Comparative Effect of Physiological Salts upon Micellization of T1304 and T1307

et al. 2023

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We present a comprehensive investigation on the interaction of tetronics (T1304 and T1307) with some important physiological salts (NaH2PO4, KH2PO4, Na2CO3, NaCl, and KI). Thermodynamic and microstructural aspects of these interactions were studied as a function of the solution temperature, pH and salt concentration. Characterizations were performed using turbidimetric, calorimetric, and scattering techniques. We show that, at ambient temperature, T1304 molecules aggregated to form spherical core–shell aggregates displaying a unimodal distribution pattern. On the other hand, unimers and large clusters dominated in the case of highly hydrophilic T1307. Its micellization was promoted in the presence of salts as per the following trend: NaCl < KH2PO4 < NaH2PO4 ≪ Na2CO3. Aggregation was found to be endothermic, and hydrophobic interactions (TΔS mic > ΔH mic) prevailed. The enthalpy–entropy compensation plot was found to be linear for both copolymers. Demicellization occurred in the presence of KI as it facilitated the buildup of water structures around the copolymer chains. This could be verified from the increase in the cloud point, critical micelle concentration, and free energy. Overall, the temperature and salts inflicted a stronger hydrophobic effect upon T1304 in comparison to T1307.

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Exploring Langmuir-Blodgett technique to investigate effect of various subphase conditions on monolayers formed by amphiphilic block co-polymers tetronic 701 and tetronic 90R4

Cited by 11 publications

References 66 publications

Controllable-assembled functional monolayers by the Langmuir–Blodgett technique for optoelectronic applications

Controllable-assembled functional monolayers by the Langmuir–Blodgett technique for optoelectronic applications

Detailed Study on the Interfacial Interaction between Different Polyoxometalates and Tetronic Block Copolymers Exploring the Langmuir–Blodgett Technique

Comparative Effect of Physiological Salts upon Micellization of T1304 and T1307

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