Measuring the Compressibility of Cellulose Nanofiber-Stabilized Microdroplets Using Acoustophoresis
Abstract
:1. Introduction
2. Theory
2.1. Acoustic Radiation Force
2.2. Indirect Pressure Estimation
2.3. Theoretical Estimation of Compressibility
3. Materials and Methods
3.1. Materials
3.2. Droplet Preparation
3.3. Droplet Characterization
3.3.1. Optical Microscopy
3.3.2. Transmission Electron Microscopy
3.3.3. Field Emission Scanning Electron Microscopy
3.4. Pressure Calibration
3.5. Acoustophoresis Tests
3.6. Acoustic Streaming
3.7. Image Analysis
4. Results and Discussion
4.1. Droplet Properties
4.2. Acoustic Contrast Factor of CNF-Shelled Droplets
4.3. Compressibility of CNF-Shelled Droplets
4.4. Acoustic Streaming
5. Conclusions
Supplementary Materials
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
Abbreviations
CNF | Cellulose nanofiber |
PFP | Perfluoropentane |
USW | Ultrasonic standing wave |
ARF | Acoustic radiation force |
FPS | Frames per second |
TEM | Transmission electron microscopy |
SEM | Scanning electron microscopy |
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Material | [kg·m] | c [m·s] | () [Pa] | Bulk Modulus () [Pa] |
---|---|---|---|---|
Water | 1000 | 1500 | 4.4 × 10 | - |
Perfluoropentane | 1630 | 477 [24] | 2.7 × 10 | - |
Polyamide | 1030 [25] | 2660 [25] | 1.4 × 10 | - |
Cellulose nanofibers | 1500 [23] | 1750–3450 [23] | 0.6–2.2 × 10 | 4.6– 17.9 × 109 |
Acoustic Pressure [kPa] | Droplet Compressibility [Pa] | Theoretical | Experimental |
---|---|---|---|
240 | |||
325 | |||
360 |
Acoustic Pressure [kPa] | Droplet Compressibility [Pa] | CNF Compressibility [Pa] | CNF Bulk Modulus [Pa] |
---|---|---|---|
240 | |||
325 | |||
360 |
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Loskutova, K.; Olofsson, K.; Hammarström, B.; Wiklund, M.; Svagan, A.J.; Grishenkov, D. Measuring the Compressibility of Cellulose Nanofiber-Stabilized Microdroplets Using Acoustophoresis. Micromachines 2021, 12, 1465. https://0-doi-org.brum.beds.ac.uk/10.3390/mi12121465
Loskutova K, Olofsson K, Hammarström B, Wiklund M, Svagan AJ, Grishenkov D. Measuring the Compressibility of Cellulose Nanofiber-Stabilized Microdroplets Using Acoustophoresis. Micromachines. 2021; 12(12):1465. https://0-doi-org.brum.beds.ac.uk/10.3390/mi12121465
Chicago/Turabian StyleLoskutova, Ksenia, Karl Olofsson, Björn Hammarström, Martin Wiklund, Anna J. Svagan, and Dmitry Grishenkov. 2021. "Measuring the Compressibility of Cellulose Nanofiber-Stabilized Microdroplets Using Acoustophoresis" Micromachines 12, no. 12: 1465. https://0-doi-org.brum.beds.ac.uk/10.3390/mi12121465