Phase behavior of the Pluronic P103/water system in the dilute and semi-dilute regimes

Álvarez-Ramírez, J. G.; Fernández, V. V. A.; Macías, E.R.; Rharbi, Yahya; Taboada, Pablo; Gámez-Corrales, R.; Puig, J. E.; Soltero, J. F. A.

doi:10.1016/j.jcis.2009.01.068

Cited by 46 publications

(64 citation statements)

References 38 publications

(80 reference statements)

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“…30°C, due to micellar growth. At even higher temperatures, g 0 keeps increasing but with a shallower slope up to the cloud point [24]. Note that g 0 increases more than three orders of magnitude in the temperature interval examined; concurrently, the solution becomes highly viscoelastic (see below).…”

Section: Methodsmentioning

confidence: 88%

“…3 shows frequency sweeps as a function of temperature made on a 20 wt% P103 sample. At low temperatures (T < 33°C), where smaller polymer-like micelles form [24], the linear viscoelastic behavior (square and circles in figure) can be reproduced with the generalized Maxwell model with three relaxation times. In this low-temperature range, the crossover frequency occurs at…”

Section: Methodsmentioning

confidence: 91%

“…Álvarez-Ramírez and co-workers studied the phase behavior of the P103/water system using density and ultrasound velocity measurements, DSC, light scattering, and rheology [24]. They reported that the critical micellar temperature (CMT) decreases as concentration increases.…”

Section: Introductionmentioning

confidence: 99%

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Rheology of the Pluronic P103/water system in a semidilute regime: Evidence of nonequilibrium critical behavior

Fernández

Tepale

Álvarez

et al. 2009

Journal of Colloid and Interface Science

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Section: Methodsmentioning

confidence: 88%

Section: Methodsmentioning

confidence: 91%

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Rheology of the Pluronic P103/water system in a semidilute regime: Evidence of nonequilibrium critical behavior

Fernández

Tepale

Álvarez

et al. 2009

Journal of Colloid and Interface Science

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“…Although spectroscopic methods are widely employed to investigate CD-based inclusion complexes formations [7,21], calorimetry is a powerful tool to evidence supramolecular interactions, and it was successfully employed for the equilibrium characterization of inclusion processes [22][23][24][25][26] and self-assembling [27][28][29][30]. With this in mind, the pseudopolyrotaxanes formation was studied by ITC changing the size of the cyclodextrin molecules.…”

Section: Calorimetric Experimentsmentioning

confidence: 99%

Thermodynamics of cyclodextrin–star copolymer threading–dethreading process

Lazzara

Milioto

Schimmenti

2015

J Therm Anal Calorim

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“…6 One of the alternatives currently applied to investigate transitions in polymer science consists of measuring rheological properties at a frequency range (0.0016-16 Hz). [7][8][9] Since DNA is a biopolymer it can be analyzed in a reometer with a cone-plate geometry, applying an oscillatory mode, while measuring the viscoelastic properties. 8 Thus, it is possible by this technique to derive two critical parameters sensible to DNA conformation, i.e.…”

mentioning

confidence: 99%

DNA Conformational Transitions at Different Concentrations and Temperatures Monitored by EIS

Bravo-Anaya

Macías

Carvajal-Ramos

et al. 2012

ECS Electrochemistry Letters

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We present an EIS study and its analysis to determine the conformational behavior of DNA calf-thymus (13 kbp). The study is carried out at open circuit potential at a pH of 7.3. The results are interpreted in terms of the adsorption impedance theory by using an equivalent circuit approach similar to the one proposed by Frumkin-Melik-Gaikazyan-Randles. All equivalent circuit parameters are inspected as a function of DNA concentrations where it is possible to identify two transitions on the double-layer structure at DNA ca. 0.33 ± 0.07 and 1.50 mg/mL related to the overlap, C*, and entanglement, C e , concentrations. Electrochemical Impedance Spectroscopy (EIS) is an outstanding and non-destructive technique suitable for investigating charged surfaces interacting with molecules such as DNA. Recent reports in the literature have demonstrated its potential to investigate DNA hybridization events that allow the development of DNA biossensing platforms, inmunosensors, and gene therapy.1-3 The last one requires a full understanding of DNA conformational changes before attempting a transfection process, which involves the collapsing of extended DNA chains into a more compact, arranged particles containing one or a few molecules before entering a cell. 4,5 Since DNA is a complex charged molecule, it becomes evident that most of the conformational changes perceived for DNA strains in solution or interacting with charged electrode surfaces may depend on several parameters, such as concentration, pH, temperature and polarization potential. 6One of the alternatives currently applied to investigate transitions in polymer science consists of measuring rheological properties at a frequency range (0.0016-16 Hz).7-9 Since DNA is a biopolymer it can be analyzed in a reometer with a cone-plate geometry, applying an oscillatory mode, while measuring the viscoelastic properties. 8 Thus, it is possible by this technique to derive two critical parameters sensible to DNA conformation, i.e. the overlap (C*) and the entanglement concentration (C e ). The first one consists of a dilute polymer solution without any interaction between the molecules until reaching C*, where molecules start interacting each other and getting packed, then reaching the overlap concentration C e , where polymer chains are entangled. 7,8 By applying rheological techniques a calf-thymus DNA solutions at a pH 8.0 have been analyzed identifying both transitions at 0.35 and 2.0 mg/mL for C* and C e respectively. 8 Although rheological methods provide macroscopic properties of DNA chains in solution a microscopic overview of the systems is still needed. 7,8 In this direction a method that has contributed to the understanding of DNA conformations at a microscopic scale is dielectric relaxation.10 By applying this technique it has been possible to investigate the dynamics and structure of water bound to DNA molecules at high frequency domain (10 6 -10 −2 Hz). 11,12 A different frequency window can be also explored by EIS (10 3 -10 −3 Hz), in conjunction with an analysis...

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Phase behavior of the Pluronic P103/water system in the dilute and semi-dilute regimes

Cited by 46 publications

References 38 publications

Rheology of the Pluronic P103/water system in a semidilute regime: Evidence of nonequilibrium critical behavior

Rheology of the Pluronic P103/water system in a semidilute regime: Evidence of nonequilibrium critical behavior

Thermodynamics of cyclodextrin–star copolymer threading–dethreading process

DNA Conformational Transitions at Different Concentrations and Temperatures Monitored by EIS

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