Razavi, Atieh ; Rutsch, Matthias ; Wismath, Sonja ; Kupnik, Mario ; Klitzing, Regine von ; Rahimzadeh, Amin (2022)
Frequency-Dependent Ultrasonic Stimulation of Poly(N-isopropylacrylamide) Microgels in Water.
In: Gels, 8 (10)
doi: 10.3390/gels8100628
Article, Bibliographie
This is the latest version of this item.
Abstract
As a novel stimulus, we use high-frequency ultrasonic waves to provide the required energy for breaking hydrogen bonds between Poly(N-isopropylacrylamide) (PNIPAM) and water molecules while the solution temperature is maintained below the volume phase transition temperature (VPTT = 32 °C). Ultrasonic waves propagate through the solution and their energy will be absorbed due to the liquid viscosity. The absorbed energy partially leads to the generation of a streaming flow and the rest will be spent to break the hydrogen bonds. Therefore, the microgels collapse and become insoluble in water and agglomerate, resulting in solution turbidity. We use turbidity to quantify the ultrasound energy absorption and show that the acousto-response of PNIPAM microgels is a temporal phenomenon that depends on the duration of the actuation. Increasing the solution concentration leads to a faster turbidity evolution. Furthermore, an increase in ultrasound frequency leads to an increase in the breakage of more hydrogen bonds within a certain time and thus faster turbidity evolution. This is due to the increase in ultrasound energy absorption by liquids at higher frequencies.
| Item Type: | Article |
|---|---|
| Erschienen: | 2022 |
| Creators: | Razavi, Atieh ; Rutsch, Matthias ; Wismath, Sonja ; Kupnik, Mario ; Klitzing, Regine von ; Rahimzadeh, Amin |
| Type of entry: | Bibliographie |
| Title: | Frequency-Dependent Ultrasonic Stimulation of Poly(N-isopropylacrylamide) Microgels in Water |
| Language: | English |
| Date: | 1 October 2022 |
| Publisher: | MDPI |
| Journal or Publication Title: | Gels |
| Volume of the journal: | 8 |
| Issue Number: | 10 |
| DOI: | 10.3390/gels8100628 |
| Corresponding Links: | |
| Abstract: | As a novel stimulus, we use high-frequency ultrasonic waves to provide the required energy for breaking hydrogen bonds between Poly(N-isopropylacrylamide) (PNIPAM) and water molecules while the solution temperature is maintained below the volume phase transition temperature (VPTT = 32 °C). Ultrasonic waves propagate through the solution and their energy will be absorbed due to the liquid viscosity. The absorbed energy partially leads to the generation of a streaming flow and the rest will be spent to break the hydrogen bonds. Therefore, the microgels collapse and become insoluble in water and agglomerate, resulting in solution turbidity. We use turbidity to quantify the ultrasound energy absorption and show that the acousto-response of PNIPAM microgels is a temporal phenomenon that depends on the duration of the actuation. Increasing the solution concentration leads to a faster turbidity evolution. Furthermore, an increase in ultrasound frequency leads to an increase in the breakage of more hydrogen bonds within a certain time and thus faster turbidity evolution. This is due to the increase in ultrasound energy absorption by liquids at higher frequencies. |
| Additional Information: | Art.No.: 628; Erstveröffentlichung |
| Divisions: | 05 Department of Physics 05 Department of Physics > Institute for condensed matter physics (2021 merged in Institute for Condensed Matter Physics) |
| Date Deposited: | 24 Oct 2022 07:22 |
| Last Modified: | 03 Jul 2024 02:58 |
| PPN: | 501610391 |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
Available Versions of this Item
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Frequency-Dependent Ultrasonic Stimulation of Poly(N-isopropylacrylamide) Microgels in Water. (deposited 07 Nov 2022 12:03)
- Frequency-Dependent Ultrasonic Stimulation of Poly(N-isopropylacrylamide) Microgels in Water. (deposited 24 Oct 2022 07:22) [Currently Displayed]
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