Phase equilibriums, self-assembly and interactions in two-, three- and four medium-chain length component systems

Rosenholm, Jarl B.

doi:10.1016/j.cis.2013.08.009

Cited by 16 publications

(6 citation statements)

References 117 publications

(332 reference statements)

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“…The temperature of liquid–liquid phase separation at which the CP is the lowest is called LCST (i.e. lower critical solution temperature). , Salts can increase (salting in) or decrease (salting out) the CP, while hydrophobic solutes, such as alkanes and long chain alcohols, usually lower it. − Table summarizes the main physicochemical properties of well-defined C i E j with i ranging from 4 to 12 and j from 1 to 4. The long chain C 10 E 4 and C 12 E 4 are considered as true surfactants and have been included for comparison, as well as SXS which is an archetypical anionic hydrotrope.…”

Section: Resultsmentioning

confidence: 99%

Hydrotropic Extraction of Carnosic Acid from Rosemary with Short-Chain Alkyl Polyethylene Glycol Ethers

Mazaud

Lebeuf²,

Laguerre

et al. 2020

ACS Sustainable Chem. Eng.

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Carnosic acid (CA) is a hydrophobic secondary metabolite and the main antioxidant of rosemary. Extractions of CA from whole leaves of rosemary have been performed with aqueous solutions of 12 short-chain alkyl polyethylene glycol ethers, abbreviated as C i E j with i = 4–8 and j = 1–4. Such compounds act as hydrotropes which are known to enhance the solubilization of hydrophobic molecules in water while avoiding the formation of liquid crystals like surfactants. The extractions are compared with those carried out with alcohols, sodium xylene sulfonate (SXS) which is an archetypical ionic hydrotrope, and longer C i E j (i = 10 or 12 and j = 4) which behave as true surfactants. C5E2 and C4E1 are the best candidates and provide 1.21 g/L CA in 21 h and 1.02 g/L in 8 h, respectively. They are more efficient than SXS and alcoholic aqueous solutions. Correlations between the chemical structure and activity have highlighted three requirements for better performances: (i) a small molecular volume V m (<250 Å3), (ii) a log P above 1, and (iii) a linear alkyl chain rather than a branched one. Finally, kinetic study and optical microscopy observations of the leaves after extraction give insight into the mode of action of the C4E j compared to ethanol.

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Section: Resultsmentioning

confidence: 99%

Hydrotropic Extraction of Carnosic Acid from Rosemary with Short-Chain Alkyl Polyethylene Glycol Ethers

Mazaud

Lebeuf²,

Laguerre

et al. 2020

ACS Sustainable Chem. Eng.

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“…In the start of my career, Scandinavian contacts were dominating and in particular I benefited from contacts with the pioneering research at Åko Akademi (started by Per Ekwall and continued by Ingvar Danielsson, Per Stenius and Jarl Rosenholm) (cf. reference [ 155 ]) During long periods, there were very fruitful contacts with the Institute for Surface Chemistry in Stockholm, especially under the directions of Per Stenius and Krister Holmberg. Scandinavian contacts dominated at an early stage; so for example, there were important Scandinavian meetings initiated by Per Ekwall already in the early 1960s.…”

Section: Scandinavian and European Networkmentioning

confidence: 99%

From surfactant to cellulose and DNA self-assembly. A 50-year journey

Lindman

2016

Colloid Polym Sci

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Surfactants have been the basis for applications in several industrial sectors for a long time. However, fundamental research was 50 years ago still limited to a small number of academic groups and even basic aspects were controversial. The field has since undergone an enormous expansion and the improved understanding has laid the basis of numerous new products as well as been the basis of important parts of nano-science and -technology.The present author has during 50 years in academia devoted most of his research to amphiphilic compounds, including both surfactants and polymers. Hereby, I had the privilege of following a very exciting development. In 2015, I had the honour to receive the Life-time Achievement Award of IACIS, the International Association of Colloid and Interface Scientists. IACIS organizes since the 1970s a tri-annual symposium, typically the best attended in the field. For the first time since 2000, it was in 2015 organized in Europe, namely Mainz, Germany. This treatise is based on my award lecture in Mainz, which covered developments from my first research as a new Ph D student in Stockholm to current work as an emeritus and visiting professor. Interestingly, discoveries in my very early work contributed to solving problems in now on-going research. Håkan Wennerström kindly wrote a quite comprehensive paper about my achievements a few years ago (Adv Colloid Interf Sci 205:1–8, [1]). In writing the present paper, I have strived at covering mainly topics not treated in detail by Håkan. In fact, I will emphasize very much our early studies as well as our studies of surfactant self-assembly by NMR and in particular look at the developments of our research and connections between different research topics.

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“…A pseudo-ternary diagram is a convenient way to determine the solubility of salt as well as the compositions of stable microemulsions and macroemulsions. Additionally, phase equilibrium has a considerable basic groundwork in the metal smelting process, fractional crystallization, semiconductors, ceramics, salt separation, and purification in natural ores. , The construction of ternary equilibrium phase diagrams is at the basis of these applications. Thermal analysis is a very useful practical method for studying phase diagrams, − and calorimetric methods have been an invaluable tool for understanding the rich phase behaviors either in the early stages of process development or in phase equilibrium applications.…”

Section: Introductionmentioning

confidence: 99%

Explanation and Exploration of the Isothermal Titration Curve for the NaCl + Na₂SO₄+ H₂O System at 298.15 K and 102.2 kPa

Zhang

Kong

et al. 2022

ACS Omega

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Isothermal titration microcalorimetry (ITC) is a common and powerful tool in thermodynamics and related fields, and the connection between the solution behavior and raw titration curve is complex, important, and worth studying, so we try to discuss this problem using a complex solid–solid–liquid diagram. Although there are many experimental methods for studying ternary phase diagrams, ITC has been proven to be a simple, universal method at normal temperature and pressure. This method can be extended to investigate phase diagrams of multisalt aqueous solutions and related systems. Here, the phase equilibrium of one common ternary system ( NaCl + Na 2 SO 4 + H 2 O) was determined using the ITC method with the aid of X-ray diffraction measurements. This isothermal and isobaric titration method can be used not only to determine the boundaries of different phase regions by analyzing changes in the slope of the observed heat vs solvent concentration plot but also to provide additional accurate data regarding the solid dissolution enthalpy and the dilution enthalpy. The dissolution enthalpy of 1 mol NaCl (Na 2 SO 4 ) solid dissolving in water to just form a saturated solution is measured at 1.92 kJ/mol (−15.60 kJ/mol), and the dissolution enthalpy of the mixed solids can be evaluated with these data. The dilution enthalpy is strongly dependent on the solute concentration (0.08–0.23 kJ/mol at the range of concentration studied), and for the same range concentration of a solute, the dilution enthalpy of Na 2 SO 4 is positive and larger than that of NaCl. Therefore, the connection between the observed heat and the microscopic behavior and the separation between the dissolution and dilution data may result in the possibility to gain a clearer understanding about the solution behaviors.

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Phase equilibriums, self-assembly and interactions in two-, three- and four medium-chain length component systems

Cited by 16 publications

References 117 publications

Hydrotropic Extraction of Carnosic Acid from Rosemary with Short-Chain Alkyl Polyethylene Glycol Ethers

Hydrotropic Extraction of Carnosic Acid from Rosemary with Short-Chain Alkyl Polyethylene Glycol Ethers

From surfactant to cellulose and DNA self-assembly. A 50-year journey

Explanation and Exploration of the Isothermal Titration Curve for the NaCl + Na₂SO₄+ H₂O System at 298.15 K and 102.2 kPa

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Phase equilibriums, self-assembly and interactions in two-, three- and four medium-chain length component systems

Cited by 16 publications

References 117 publications

Hydrotropic Extraction of Carnosic Acid from Rosemary with Short-Chain Alkyl Polyethylene Glycol Ethers

Hydrotropic Extraction of Carnosic Acid from Rosemary with Short-Chain Alkyl Polyethylene Glycol Ethers

From surfactant to cellulose and DNA self-assembly. A 50-year journey

Explanation and Exploration of the Isothermal Titration Curve for the NaCl + Na2SO4+ H2O System at 298.15 K and 102.2 kPa

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Explanation and Exploration of the Isothermal Titration Curve for the NaCl + Na₂SO₄+ H₂O System at 298.15 K and 102.2 kPa