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A model for ultrasound absorption and dispersion in dilute suspensions of nanometric contrast agents
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10.1121/1.4765639
/content/asa/journal/jasa/132/6/10.1121/1.4765639
http://aip.metastore.ingenta.com/content/asa/journal/jasa/132/6/10.1121/1.4765639

Figures

Image of FIG. 1.
FIG. 1.

Particle geometry.

Image of FIG. 2.
FIG. 2.

(Color online) Influence of mechanisms on sound velocity for the model system. R 0 = 150 nm. Magenta line/triangles: Water bulk absorption only. Blue line/diamonds: nUCA translational effects only. Red line/circles: nUCA dilatational effects only. Black line/squares: All effects included. Solid/dashed lines: Kelvin–Voigt/Maxwell model.

Image of FIG. 3.
FIG. 3.

(Color online) Influence of mechanisms on sound velocity for the model system. R 0 = 75 nm. Same color code as in Fig. 2.

Image of FIG. 4.
FIG. 4.

(Color online) Influence of mechanisms on sound absorption for the model system. R 0 = 150 nm. Same color code as in Fig. 2.

Image of FIG. 5.
FIG. 5.

(Color online) Influence of mechanisms on sound absorption for the model system. R 0 = 75 nm. Same color code as Fig. 2.

Image of FIG. 6.
FIG. 6.

(Color online) Zoom of Fig. 4 on the frequency range 0–20 MHz.

Image of FIG. 7.
FIG. 7.

(Color online) Zoom of Fig. 5 on the frequency range 0–20 MHz.

Image of FIG. 8.
FIG. 8.

Derivative of the low frequency phase velocity with respect to volume fraction δc (in m/s) versus shell relative thickness h/R 20 for a dilute suspension in water. Core: PFOB (solid line). PFH (dashed line). PFP (dashed-dotted line).

Image of FIG. 9.
FIG. 9.

(Color online) Sound velocity (left) and absorption coefficient (right) for R 0 = 150 nm. GS  = 60 MPa (blue line/squares), GS  = 250 MPa (red line/circles), GS  = 1 GPa (magenta line/triangles). Solid/dashed lines: Kelvin–Voigt/Maxwell model. Other parameters: Model system.

Image of FIG. 10.
FIG. 10.

(Color online) Sound velocity (left) and absorption coefficient (right) for R 0 = 150 nm. μS  = 0.2 Pa s (blue line/squares), μS  = 1 Pa s (red line/circles), μS  = 5 Pa s (magenta line/triangles). Solid/dashed lines: Kelvin–Voigt/Maxwell model. Other parameters: Model system.

Image of FIG. 11.
FIG. 11.

(Color online) Sound velocity (left) and absorption coefficient (right) for R 0 = 150 nm. Relative thickness h/R 20 10% (blue line/squares), 20% (red line/circles), 40% (magenta line/triangles). Solid/dashed lines: Kelvin–Voigt/Maxwell model. Other parameters: Model system.

Tables

Generic image for table
TABLE I.

Selected values for the model system, including references for material properties at 25 °C. For PLGA (shell), choice of values for the rigidity modulus and viscosity are discussed in the text. Data for water are standard.

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/content/asa/journal/jasa/132/6/10.1121/1.4765639
2012-12-06
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A model for ultrasound absorption and dispersion in dilute suspensions of nanometric contrast agents
http://aip.metastore.ingenta.com/content/asa/journal/jasa/132/6/10.1121/1.4765639
10.1121/1.4765639
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