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Dean KM, Babayco CB, Sluss DRB, Williamson JC. The accuracy of liquid-liquid phase transition temperatures determined from semiautomated light scattering measurements. J Chem Phys 2012; 133:074506. [PMID: 20726651 DOI: 10.1063/1.3469778] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The synthetic-method determination of liquid-liquid coexistence curves using semiautomated light scattering instrumentation and stirred samples is based on identifying the coexistence curve transition temperatures (T(cx)) from sudden changes in turbidity associated with droplet formation. Here we use a thorough set of such measurements to evaluate the accuracy of several different analysis methods reported in the literature for assigning T(cx). More than 20 samples each of weakly opalescent isobutyric acid+water and strongly opalescent aniline+hexane were tested with our instrumentation. Transmitted light and scattering intensities at 2 degrees , 24 degrees , and 90 degrees were collected simultaneously as a function of temperature for each stirred sample, and the data were compared with visual observations and light scattering theory. We find that assigning T(cx) to the onset of decreased transmitted light or increased 2 degrees scattering has a potential accuracy of 0.01 K or better for many samples. However, the turbidity due to critical opalescence obscures the identification of T(cx) from the light scattering data of near-critical stirred samples, and no simple rule of interpretation can be applied regardless of collection geometry. At best, when 90 degrees scattering is collected along with transmitted or 2 degrees data, the accuracy of T(cx) is limited to 0.05 K for near-critical samples. Visual determination of T(cx) remains the more accurate approach in this case.
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Affiliation(s)
- Kevin M Dean
- Department of Chemistry, Willamette University, 900 State Street, Salem, Oregon 97301, USA
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Zou F, Dong X, Liu W, Yang J, Lin D, Liang A, Li W, Han CC. Shear Induced Phase Boundary Shift in the Critical and Off-Critical Regions for a Polybutadiene/Polyisoprene Blend. Macromolecules 2012. [DOI: 10.1021/ma2021562] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fasheng Zou
- State Key Laboratory of Polymer
Physics and Chemistry and CAS Key Laboratory of Engineering Plastics,
Joint Laboratory of Polymer Science and Materials, Beijing National
Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Xia Dong
- State Key Laboratory of Polymer
Physics and Chemistry and CAS Key Laboratory of Engineering Plastics,
Joint Laboratory of Polymer Science and Materials, Beijing National
Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wei Liu
- State Key Laboratory of Polymer
Physics and Chemistry and CAS Key Laboratory of Engineering Plastics,
Joint Laboratory of Polymer Science and Materials, Beijing National
Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Jian Yang
- State Key Laboratory of Polymer
Physics and Chemistry and CAS Key Laboratory of Engineering Plastics,
Joint Laboratory of Polymer Science and Materials, Beijing National
Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Demiao Lin
- State Key Laboratory of Polymer
Physics and Chemistry and CAS Key Laboratory of Engineering Plastics,
Joint Laboratory of Polymer Science and Materials, Beijing National
Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Aimin Liang
- Yanshan Branch, SINOPEC Beijing Research Institute of Chemical Industry, Beijing 102500, China
| | - Wei Li
- Yanshan Branch, SINOPEC Beijing Research Institute of Chemical Industry, Beijing 102500, China
| | - Charles C. Han
- State Key Laboratory of Polymer
Physics and Chemistry and CAS Key Laboratory of Engineering Plastics,
Joint Laboratory of Polymer Science and Materials, Beijing National
Laboratory for Molecular Science, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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Krall AH, Sengers JV, Hamano K. Experimental studies of the rheology of a simple liquid mixture during phase separation. PHYSICAL REVIEW. E, STATISTICAL PHYSICS, PLASMAS, FLUIDS, AND RELATED INTERDISCIPLINARY TOPICS 1993; 48:357-376. [PMID: 9960599 DOI: 10.1103/physreve.48.357] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Baumberger T, Perrot F, Beysens D. Kinetics of nucleation and growth in a near-critical binary liquid mixture at rest and under a shear flow. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1992; 46:7636-7642. [PMID: 9908115 DOI: 10.1103/physreva.46.7636] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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Krall AH, Sengers JV, Hamano K. Viscoelasticity of a simple liquid mixture during spinodal decomposition. PHYSICAL REVIEW LETTERS 1992; 69:1963-1966. [PMID: 10046361 DOI: 10.1103/physrevlett.69.1963] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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