Interação tensoativo/hidrótropo em sistemas aquosos, utilizando ressonância magnética nuclear de ¹H e 13C

Mansur, Cláudia R. E.; Lucas, Elizabete F.; Pacheco, Carlos; González, Gaspar

doi:10.1590/s0100-40422001000100010

Cited by 5 publications

(15 citation statements)

References 12 publications

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“…The results show that for PEO-PPO block copolymers, structure vs properties vs use relationships are coherent and very useful in the prediction of the performance of emulsion-breaking additives [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

PLURONIC × TETRONIC polyols: study of their properties and performance in the destabilization of emulsions formed in the petroleum industry

Mansur

Barboza

González

et al. 2004

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

PLURONIC × TETRONIC polyols: study of their properties and performance in the destabilization of emulsions formed in the petroleum industry

Mansur

Barboza

González

et al. 2004

Journal of Colloid and Interface Science

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“…[13,[65][66][67] This technique enables determining the composition of PEO-PPO block copolymers and the CMC and CMT values of these surfactants in solution, by observing the chemical shifts of the groups that undergo alterations when the molecules pass from unimeric to micellar form. chemical environment, quantification of the changes can be used efficiently to detect interactions among the dissolved molecules.…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

“…chemical environment, quantification of the changes can be used efficiently to detect interactions among the dissolved molecules. [13,[65][66][67] The micellization process of PEO-PPO copolymers as a function of temperature can be studied specifically by nuclear magnetic resonance of hydrogen ( begin to appear at lower frequencies. This behavior can be attributed to the loss of mobility of the PPO chains after the micellization process, since these chains remain located inside the micelles formed.…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

“…A study using monofunctional diblock copolymers showed that the CMC values obtained by this method are in close agreement with those obtained by surface tension and calorimetry. [6,13] Alternatively, the single-step model allows calculating the aggregation number N of the micelles of surfactants. [68] This model assumes there is a reduction in the value of C uni after micellization and is based on the mass action theory, where the unimers and micelles are in equilibrium.…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

“…[13] The limitation of this model's application is that it must be applied to colloidal system with large particles. [68] The study the micellization process of PEO-PPO block copolymers has also been done by measuring spin-lattice (T 1 ) and spin-spin (T 2 ) relaxation time.…”

Section: Nuclear Magnetic Resonancementioning

confidence: 99%

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Evaluation of the Physical‐Chemical Properties of Poly(ethylene oxide)‐block‐Poly(propylene oxide) by Different Characterization Techniques

Mansur

Spinelli

González

et al. 2007

Macromolecular Symposia

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Summary: A surfactant's efficiency for a given application is dependent on its chemical structure and physical-chemical properties in solution, including surfactant solubility as a function of concentration and temperature as well as adsorption and aggregation behavior. This review work describes the main physical-chemical properties ascertained by means of various characterization techniques, which can be used to study nonionic surfactants based on poly(ethylene oxide)-block-poly(propylene oxide) (PEO-PPO). Among these, some are widely used and others are relatively new for this type of application.

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Novel application of PEG/SDS interaction as a wettability modifier of hydrophobic carbonate surfaces

et al. 2018

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Wettability alteration of carbonate reservoirs from oil-wet to water-wet is an important method to increase the efficiency of oil recovery. Interaction between surfactants and polymers can enhance the effectiveness of surfactants in EOR applications. In this study, the interaction of polyethylene glycol (PEG) with an ionic surfactant, sodium dodecyl sulphate (SDS), is evaluated on an oil-wet carbonate rock surface by using contact angle measurements. The results reveal that wettability alteration of carbonate rocks is achieved through PEG/SDS interaction on the rock surface above a critical aggregation concentration (CAC). The behaviour of PEG/SDS aqueous solutions is evaluated using surface and interfacial tension measurements. Furthermore, the effect of PEG and SDS concentrations and impact of electrolyte addition on PEG/SDS interaction are investigated. It is shown that electrolyte (NaCl) can effectively decrease the CAC values and accordingly initiate the wettability alteration of rocks. Moreover, in a constant SDS concentration, the addition of NaCl leads to a reduction in the contact angle, which can also be obtained by increasing the aging time, temperature and pre-adsorption of PEG on the rock surface.

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Interação tensoativo/hidrótropo em sistemas aquosos, utilizando ressonância magnética nuclear de ¹H e 13C

Cited by 5 publications

References 12 publications

PLURONIC × TETRONIC polyols: study of their properties and performance in the destabilization of emulsions formed in the petroleum industry

PLURONIC × TETRONIC polyols: study of their properties and performance in the destabilization of emulsions formed in the petroleum industry

Evaluation of the Physical‐Chemical Properties of Poly(ethylene oxide)‐block‐Poly(propylene oxide) by Different Characterization Techniques

Novel application of PEG/SDS interaction as a wettability modifier of hydrophobic carbonate surfaces

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