Apparatus for measuring time-resolved light scattering profiles from supercritical polymer solutions undergoing phase separation under high pressure

Kojima, Junichi; Nakayama, Yoshiaki; Takenaka, Mikihito; Hashimoto, Takeji

doi:10.1063/1.1145418

Cited by 29 publications

(23 citation statements)

References 38 publications

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“…Light Scattering Instrument . As described in our previous paper, the light scattering instrument used in this study has the following features: (1) the instrument withstands up to pressure 34.3 MPa and temperature 573 K; (2) viscous polymer solutions can be easily handled; (3) pressure jump can be attained with 0.01 MPa precision; and (4) the scattered intensity distribution over wide angular range (0°−30° in the air) can be measured at 100 scans/s by using the photodiode array light scattering system. We describe below only the essential part of the apparatus for this work, and the details should be referred to ref .…”

Section: Methodsmentioning

confidence: 99%

Early Stage Spinodal Decomposition in Polymer Solution under High Pressure

et al. 1999

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Early stage spinodal decomposition (SD) of polymer solutions (polypropylene/trichlorofluoromethane) induced by pressure jump was investigated with a light scattering instrument designed for polymer solutions under high pressure and high temperature. The changes in the scattered intensity with time at the early stage SD were found to be approximated by Cahn linearized theory or CahnHilliard-Cook theory. The analyses with the theories yielded the characteristic parameters such as the interdiffusion coefficient D app and the characteristic wavenumber qm(0). Unlike other experiments on the polymer solutions, the pressure dependence of the parameters was found to obey the mean field behavior. This may be because the quench depth conditions attained by the pressure jump were much deeper than those attained in other experiments.

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Section: Methodsmentioning

confidence: 99%

Early Stage Spinodal Decomposition in Polymer Solution under High Pressure

et al. 1999

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“…[28][29][30][31][32][33][34] Although these approaches are useful in some instances they require purpose built reaction chambers. Further, previous studies have focused on characterization of the polymer rather than the process as a whole.…”

Section: Introductionmentioning

confidence: 99%

Time‐lapsed imaging for in‐process evaluation of supercritical fluid processing of tissue engineering scaffolds

Mather

Brion

White

et al. 2009

Biotechnology Progress

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This article demonstrates the application of time-lapsed imaging and image processing to inform the supercritical processing of tissue scaffolds that are integral to many regenerative therapies. The methodology presented provides online quantitative evaluation of the complex process of scaffold formation in supercritical environments. The capabilities of the developed system are demonstrated through comparison of scaffolds formed from polymers with different molecular weight and with different venting times. Visual monitoring of scaffold fabrication enabled key events in the supercritical processing of the scaffolds to be identified including the onset of polymer plasticization, supercritical points and foam formation. Image processing of images acquired during the foaming process enabled quantitative tracking of the growing scaffold boundary that provided new insight into the nature of scaffold foaming. Further, this quantitative approach assisted in the comparison of different scaffold fabrication protocols. Observed differences in scaffold formation were found to persist, post-fabrication as evidenced by micro x-ray computed tomography (micro x-ray CT) images. It is concluded that time-lapsed imaging in combination with image processing is a convenient and powerful tool to provide insight into the scaffold fabrication process.

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“…[9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25] However, none of the reported high-pressure cells had the capacity to provide scattering measurements using more than one probe radiation simultaneously. In order to obtain the scattering information covering a wide q range, we have developed a temperatureand pressure-controlled chamber for simultaneous SAXS and light scattering ͑LS͒ measurements.…”

Section: Introductionmentioning

confidence: 99%