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Frequency-Dependent Ultrasonic Stimulation of Poly(N-isopropylacrylamide) Microgels in Water

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
Artikel, Bibliographie

Kurzbeschreibung (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.

Typ des Eintrags: Artikel
Erschienen: 2022
Autor(en): Razavi, Atieh ; Rutsch, Matthias ; Wismath, Sonja ; Kupnik, Mario ; Klitzing, Regine von ; Rahimzadeh, Amin
Art des Eintrags: Bibliographie
Titel: Frequency-Dependent Ultrasonic Stimulation of Poly(N-isopropylacrylamide) Microgels in Water
Sprache: Englisch
Publikationsjahr: 1 Oktober 2022
Verlag: MDPI
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Gels
Jahrgang/Volume einer Zeitschrift: 8
(Heft-)Nummer: 10
DOI: 10.3390/gels8100628
Kurzbeschreibung (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.

Zusätzliche Informationen:

Art.No.: 628; Erstveröffentlichung

Fachbereich(e)/-gebiet(e): 05 Fachbereich Physik
05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM))
Hinterlegungsdatum: 24 Okt 2022 07:22
Letzte Änderung: 09 Mär 2023 06:20
PPN: 501610391
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