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Grishenkov, Dmitry, Associate ProfessorORCID iD iconorcid.org/0000-0002-3699-396X
Publications (10 of 71) Show all publications
Ozogul, B., Akar, U., Mercimek, R., Talabazar, F. R., Sarraf, S. S., Aghdam, A. S., . . . Koşar, A. (2024). Hydrodynamic Cavitation‐Induced Thrombolysis on a Clot‐on‐a‐Chip Platform. Advanced NanoBiomed Research, 5(1)
Open this publication in new window or tab >>Hydrodynamic Cavitation‐Induced Thrombolysis on a Clot‐on‐a‐Chip Platform
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2024 (English)In: Advanced NanoBiomed Research, ISSN 2699-9307, Vol. 5, no 1Article in journal (Refereed) Published
Place, publisher, year, edition, pages
Wiley, 2024
National Category
Medical Laboratory Technologies
Research subject
Medical Technology
Identifiers
urn:nbn:se:kth:diva-364878 (URN)10.1002/anbr.202400112 (DOI)001334996500001 ()2-s2.0-85206590434 (Scopus ID)
Note

QC 20250618

Available from: 2025-06-17 Created: 2025-06-17 Last updated: 2025-06-18Bibliographically approved
Maleki, M., Rokhsar talabazar, F., Toyran, E., Priyadarshi, A., Sheibani Aghdam, A., Villanueva, L. G., . . . Ghorbani, M. (2024). New insights on cavitating flows over a microscale backward-facing step. Physics of fluids, 36(9), Article ID 093335.
Open this publication in new window or tab >>New insights on cavitating flows over a microscale backward-facing step
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2024 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 36, no 9, article id 093335Article in journal (Refereed) Published
Abstract [en]

This study introduces the first experimental analysis of shear cavitation in a microscale backward-facing step (BFS) configuration. It explores shear layer cavitation under various flow conditions in a microfluidic device with a depth of 60 μm and a step height of 400 μm. The BFS configuration, with its unique characteristics of upstream turbulence and post-reattachment pressure recovery, provides a controlled environment for studying shear-induced cavitation without the complexities of other microfluidic geometries. Experiments were conducted across four flow patterns: inception, developing, shedding, and intense shedding, by varying upstream pressure and the Reynolds number. The study highlights key differences between microscale and macroscale shear cavitation, such as the dominant role of surface forces on nuclei distribution, vapor formation, and distinct timescales for phenomena like shedding and shockwave propagation. It is hypothesized that vortex strength in the shear layer plays a significant role in cavity shedding during upstream shockwave propagation. Results indicate that increased pressure notably elevates the mean thickness, length, and intensity within the shear layer. Instantaneous data analysis identified two vortex modes (shedding and wake modes) at the reattachment zone, which significantly affect cavitation shedding frequency and downstream penetration. The wake mode, characterized by stronger and lower-frequency vortices, transports cavities deeper into the channel compared to the shedding mode. Additionally, vortex strength, proportional to the Reynolds number, affects condensation caused by shockwaves. The study confirms that nuclei concentration peaks in the latter half of the shear layer during cavitation inception, aligning with the peak void fraction region.

Place, publisher, year, edition, pages
AIP Publishing, 2024
National Category
Fluid Mechanics
Identifiers
urn:nbn:se:kth:diva-354897 (URN)10.1063/5.0225030 (DOI)001373369400014 ()2-s2.0-85205718930 (Scopus ID)
Note

QC 20241018

Available from: 2024-10-16 Created: 2024-10-16 Last updated: 2025-02-09Bibliographically approved
Talabazar, F. R., Baresel, C., Ghorbani, R., Tzanakis, I., Kosar, A., Grishenkov, D. & Ghorbani, M. (2024). Removal of per- and polyfluoroalkyl substances (PFAS) from wastewater using the hydrodynamic cavitation on a chip concept. Chemical Engineering Journal, 495, Article ID 153573.
Open this publication in new window or tab >>Removal of per- and polyfluoroalkyl substances (PFAS) from wastewater using the hydrodynamic cavitation on a chip concept
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2024 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 495, article id 153573Article in journal (Refereed) Published
Abstract [en]

The elimination of micropollutants such as highly fluorinated substances, including per- and polyfluoroalkyl substances (PFAS), in wastewater treatment plants has been receiving growing attention due to the urgent need to minimize their adverse effects on natural water and associated ecosystems. Conventional treatment methods often fall short in effectively removing PFAS. In this study, the Hydrodynamic Cavitation on a Chip concept (HCOC) was utilized to degrade 11 common PFAS variants (PFAS11) for the first time in three different hydrodynamic cavitation reactor set-ups, each enhanced with surface modifications involving roughness elements. Stockholm municipal wastewater treated by a Membrane BioReactor (MBR) process was subjected to fully developed cavitating flow treatment using the three distinct microscale hydrodynamic cavitation (HC) reactors. The obtained results indicate that the chemical-free HCOC technique employed in this study has a significant potential in the degradation of nearly all investigated PFAS11 compounds at a notable rate of 36.1 % while the combination with MBR process can prevent blockage within the fluidic channels, enabling continuous operation with high throughput processing rates. Our proposed methodology demonstrated promising results in eliminating PFAS and could contribute to advancements in the use of microscale HC to treat micropollutants in wastewater. These findings could be a major leap in water treatment technologies addressing the global burden of resource-efficient micropollutant water treatment.

Place, publisher, year, edition, pages
Elsevier BV, 2024
Keywords
Hydrodynamic Cavitation on a chip, Organic micropollutants, Microscale hydrodynamic cavitation, PFAS, Microfluidics, Wastewater
National Category
Water Engineering
Identifiers
urn:nbn:se:kth:diva-350864 (URN)10.1016/j.cej.2024.153573 (DOI)001264332500001 ()2-s2.0-85197244316 (Scopus ID)
Note

QC 20240722

Available from: 2024-07-22 Created: 2024-07-22 Last updated: 2024-07-22Bibliographically approved
Song, X., Shen, G. & Grishenkov, D. (2023). A comparative study on detection of polymer-shelled microbubbles by different excitation pulses. Journal of the Acoustical Society of America, 154(1), 482-493
Open this publication in new window or tab >>A comparative study on detection of polymer-shelled microbubbles by different excitation pulses
2023 (English)In: Journal of the Acoustical Society of America, ISSN 0001-4966, E-ISSN 1520-8524, Vol. 154, no 1, p. 482-493Article in journal (Refereed) Published
Abstract [en]

Contrast agents are widely used in ultrasound imaging. Many imaging techniques have been developed to improve the contrast between tissue and the agents, based on the nonlinear response of microbubbles. In this study, heterodyne excitation was introduced and was compared with traditional sinusoidal signal and chirp excitation for visualizing polymer-shelled microbubbles and degassed water in a tissue-mimicking phantom. Pulse inversion technique was implemented under plane wave (PW) and focused imaging mode. Image enhancement was evaluated by contrast-to-tissue ratio (CTR) at different transmitting peak negative pressures (PNPs). Experimental results showed that heterodyne excitation had a better suppression effect on tissue signals in PW imaging. The CTR reached an approximation of 17 dB at a low peak negative pressure, which was much higher compared to other excitations. In focused wave imaging, a saturation threshold of CTR was observed for the sinusoidal wave burst and chirp excitation at high PNPs. Heterodyne excitation showed considerable contrast-to-noise ratio under both imaging modes. The response of a polymer-shelled microbubble under heterodyne excitation was simulated. Simulations suggest that in future work, specific filters are required to extract the nonlinear components, such as at the two-peak frequencies around fundamental frequency, to achieve a better image enhancement effect.

Place, publisher, year, edition, pages
Acoustical Society of America (ASA), 2023
National Category
Radiology, Nuclear Medicine and Medical Imaging
Identifiers
urn:nbn:se:kth:diva-334717 (URN)10.1121/10.0020293 (DOI)001036228000004 ()37490275 (PubMedID)2-s2.0-85165766676 (Scopus ID)
Note

QC 20230824

Available from: 2023-08-24 Created: 2023-08-24 Last updated: 2023-08-24Bibliographically approved
Loskutova, K., Torras, M., Zhao, Y., Svagan, A. J. & Grishenkov, D. (2023). Biocompatibility of Cellulose Nanofiber-Coated Perfluoropentane Droplets. In: : . Paper presented at The 28th European Symposium on Ultrasound Contrast Imaging.
Open this publication in new window or tab >>Biocompatibility of Cellulose Nanofiber-Coated Perfluoropentane Droplets
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2023 (English)Conference paper, Poster (with or without abstract) (Refereed)
Abstract [en]

The cellulose nanofiber(CNF)-shelled perfluoropentane (PFP) droplets were the subject of the evaluation in this work. CNF-shelled PFP droplets  Mechanical and acoustic properties were studied previously and reported elsewhere [1-4], however more insights into the biological effects of these droplets are needed to translate previous in vitro tests into in vivo applications as drug carriers in ultrasound-mediated drug delivery. 

The aim of this work is to investigate the effect of CNF-shelled PFP droplets on cell viability of 4T1 cells, a murine breast cancer cell line. Cells were exposed to different concentrations of droplets with or without the addition of paclitaxel, i.e. a hydrophobic cancer drug.

[1].  Ghorbani M, Olofsson K, Benjamins J-W, Loskutova K, Paulraj T, Wiklund M, Grishenkov D, Svagan A J, Unravelling the Acoustic and Thermal Responses of Perfluorocarbon Liquid Droplets Stabilized with Cellulose Nanofibers, Langmuir 35(40): 13090-13099, 2019.

[2].  Song X, Loskutova K, Chen H, Shen G, Grishenkov D, Deriving acoustic properties for perfluoropentane droplets with viscoelastic cellulose nanofiber shell via numerical simulations, The Journal of the Acoustical Society of America 150(3): 1750-1761, 2021.

[3].  Loskutova K, Nimander D, Gouwy I, Chen H, Ghorbani M, Svagan A J, Grishenkov D, A Study on the Acoustic Response of Pickering Perfluoropentane Droplets in Different Media, ACS Omega 6(8): 5670-5678, 2019.

[4].  Loskutova K, Olofsson K, Hammarström B, Wiklund M, Svagan A J, Grishenkov D, Measuring the Compressibility of Cellulose Nanofiber-Stabilized Microdroplets Using Acoustophoresis, Micromachines 12(12): 1465, 2021.

National Category
Other Medical Engineering
Research subject
Medical Technology
Identifiers
urn:nbn:se:kth:diva-325646 (URN)
Conference
The 28th European Symposium on Ultrasound Contrast Imaging
Funder
KTH Royal Institute of Technology, 65229
Note

QC 20230411

Available from: 2023-04-11 Created: 2023-04-11 Last updated: 2023-04-11Bibliographically approved
Talabazar, F. R., Maleki, M., Aghdam, A. S., Grishenkov, D., Ghorbani, M. & Kosar, A. (2023). Cavitation inception and evolution in cavitation on a chip devices at low upstream pressures. Physics of fluids, 35(1), Article ID 012012.
Open this publication in new window or tab >>Cavitation inception and evolution in cavitation on a chip devices at low upstream pressures
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2023 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 35, no 1, article id 012012Article in journal (Refereed) Published
Abstract [en]

The concept of "hydrodynamic cavitation on a chip" offers facile generation of cavitating flows in microdomains, which can be easily scaled up by arranging short microchannels (micro-orifices) in cascade formations. In this regard, microscale cavitation in an energy-efficient test rig has the potential of increasing utilization possibilities of cavitation in a wide range of applications such as liquid-phase exfoliation. In this study, a new experimental test rig was constructed to generate microscale hydrodynamic cavitation. This setup enables cavitation bubble generation at low upstream pressures through the control of the downstream pressure of the device. Particular attention was directed to the classification of flow patterns, scale effects, and cavitating flow evolutions with an in-depth categorization of underlying mechanisms such as Kelvin-Helmholtz instability. Cavitation inception appeared in the form of a single bubble. The appearance of different attached cavitating flow patterns within the microfluidic device was accompanied by new physics, which revealed that cavitation generation and development are affected by the existence of various fluid flow phenomena, particularly the jet flow. The outcome of this study makes hydrodynamic cavitation on a chip attractive for applications, where the cavitation effects are sought in the presence of multiphase fluid flows.

Place, publisher, year, edition, pages
AIP Publishing, 2023
National Category
Fluid Mechanics
Identifiers
urn:nbn:se:kth:diva-324399 (URN)10.1063/5.0132025 (DOI)000917983800003 ()2-s2.0-85146293603 (Scopus ID)
Note

QC 20230301

Available from: 2023-03-01 Created: 2023-03-01 Last updated: 2025-02-09Bibliographically approved
Loskutova, K., Torras, M., Zhao, Y., Svagan, A. J. & Grishenkov, D. (2023). Cellulose Nanofiber-Coated Perfluoropentane Droplets: Fabrication and Biocompatibility Study. International Journal of Nanomedicine, 18, 1835-1847
Open this publication in new window or tab >>Cellulose Nanofiber-Coated Perfluoropentane Droplets: Fabrication and Biocompatibility Study
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2023 (English)In: International Journal of Nanomedicine, ISSN 1176-9114, E-ISSN 1178-2013, Vol. 18, p. 1835-1847Article in journal (Refereed) Published
Abstract [en]

Purpose: To study the effect of cellulose nanofiber (CNF)-shelled perfluoropentane (PFP) droplets on the cell viability of 4T1 breast cancer cells with or without the addition of non-encapsulated paclitaxel.

Methods: The CNF-shelled PFP droplets were produced by mixing a CNF suspension and PFP using a homogenizer. The volume size distribution and concentration of CNF-shelled PFP droplets were estimated from images taken with an optical microscope and analyzed using Fiji software and an in-house Matlab script. The thermal stability was qualitatively assessed by comparing the size distribution and concentration of CNF-shelled PFP droplets at room temperature (~22°) and 37°C. The cell viability of 4T1 cells was measured using a 3-[4,5-dimethylthiazol-2yl]-2,5-diphenyltetrazolium bromide (MTT) assay. Additionally, a hemolysis assay was performed to assess blood compatibility of CNF-shelled PFP droplets.

Results: The droplet diameter and concentration of CNF-shelled PFP droplets decreased after 48 hours at both room temperature and 37°C. In addition, the decrease in concentration was more significant at 37°C, from 3.50 ± 0.64× 10^6 droplets/mL to 1.94 ± 0.10× 10^6 droplets/mL, than at room temperature, from 3.65 ± 0.29× 10^6 droplets/mL to 2.56 ± 0.22× 10^6 droplets/mL. The 4T1 cell viability decreased with increased exposure time and concentration of paclitaxel, but it was not affected by the presence of CNF-shelled PFP droplets. No hemolysis was observed at any concentration of CNF-shelled PFP droplets.

Conclusion: CNF-shelled PFP droplets have the potential to be applied as drug carriers in ultrasound-mediated therapy.

Keywords
cell viability, ultrasound-mediated therapy, paclitaxel, cellulose nanofibers, biocompatibility, 4T1, Pickering emulsion
National Category
Other Medical Engineering
Research subject
Medical Technology
Identifiers
urn:nbn:se:kth:diva-325656 (URN)10.2147/ijn.s397626 (DOI)000967252800001 ()37051314 (PubMedID)2-s2.0-85152340571 (Scopus ID)
Note

QC 20230412

Available from: 2023-04-11 Created: 2023-04-11 Last updated: 2023-05-09Bibliographically approved
Talabazar, F. R., Aghdam, A. S., Jafarpour, M., Grishenkov, D., Kosar, A. & Ghorbani, M. (2022). Chemical effects in "hydrodynamic cavitation on a chip": The role of cavitating flow patterns. Chemical Engineering Journal, 445, Article ID 136734.
Open this publication in new window or tab >>Chemical effects in "hydrodynamic cavitation on a chip": The role of cavitating flow patterns
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2022 (English)In: Chemical Engineering Journal, ISSN 1385-8947, E-ISSN 1873-3212, Vol. 445, article id 136734Article in journal (Refereed) Published
Abstract [en]

Amongst the advanced oxidation processes (AOPs), hydrodynamic cavitation (HC) has emerged as one of the most cost-efficient, simple and ecologically friendly approaches in the recent decade. This type of the cavitation, in contrast to its counterpart (acoustic cavitation), has a huge potential to upscale to the industrial levels. In the recent years, the micro-scale HC (HC on a chip concept) has exhibited favorable efficacy in terms of nucleation type, surface effects and flow pattern dominancy. In this study, the chemical effects of the HC on a chip concept are shown for the first time by considering the effects of the cavitating flow patterns. So, this is the first attempt to understand the effects of the inception and developed cavitating flow patterns on the chemical reactions during the bubble collapse in the micro-scale. In addition, a particular attention is paid to the chemical reaction effects before the cavitation bubble observation in this investigation. Our results indicated that the triiodide releasing amount was interestingly maximum before the inception occurred, especially at the first cycle. The released amount decreased at the inception and increased for the case of the developed twin cavities. We also showed that, comparing to our previous studies, the cavitation arrived at a relatively lower upstream pressure in the open loop cavitation test rig. Therefore, the outcome of this approach reveals the significance of the in-depth investigations of the complex and very transient nature of the cavitation at different flow patterns. Furthermore, this study implied that reactors benefitting HC on a chip concept will be environmentally friendly tools for producing products from the wastes and worthless materials in the near future.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Hydrodynamic cavitation (HC), Chemical effects, HC on a chip, Micro-scale, Triiodide
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-314247 (URN)10.1016/j.cej.2022.136734 (DOI)000803690300006 ()2-s2.0-85129613566 (Scopus ID)
Note

QC 20220617

Available from: 2022-06-17 Created: 2022-06-17 Last updated: 2022-06-25Bibliographically approved
Seyedmirzaei Sarraf, S., Rokhsar Talabazar, F., Namli, I., Maleki, M., Sheibani Aghdam, A., Gharib, G., . . . Koşar, A. (2022). Fundamentals, biomedical applications and future potential of micro-scale cavitation-a review. Lab on a Chip, 22(12), 2237-2258
Open this publication in new window or tab >>Fundamentals, biomedical applications and future potential of micro-scale cavitation-a review
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2022 (English)In: Lab on a Chip, ISSN 1473-0197, E-ISSN 1473-0189, Vol. 22, no 12, p. 2237-2258Article in journal (Refereed) Published
Abstract [en]

Thanks to the developments in the area of microfluidics, the cavitation-on-a-chip concept enabled researchers to control and closely monitor the cavitation phenomenon in micro-scale. In contrast to conventional scale, where cavitation bubbles are hard to be steered and manipulated, lab-on-a-chip devices provide suitable platforms to conduct smart experiments and design reliable devices to carefully harness the collapse energy of cavitation bubbles in different bio-related and industrial applications. However, bubble behavior deviates to some extent when confined to micro-scale geometries in comparison to macro-scale. Therefore, fundamentals of micro-scale cavitation deserve in-depth investigations. In this review, first we discussed the physics and fundamentals of cavitation induced by tension-based as well as energy deposition-based methods within microfluidic devices and discussed the similarities and differences in micro and macro-scale cavitation. We then covered and discussed recent developments in bio-related applications of micro-scale cavitation chips. Lastly, current challenges and future research directions towards the implementation of micro-scale cavitation phenomenon to emerging applications are presented. 

Place, publisher, year, edition, pages
Royal Society of Chemistry (RSC), 2022
Keywords
Medical applications, Microfluidics, Biomedical applications, Bubble behavior, Cavitation bubble, Cavitation phenomenon, Energy, Energy depositions, Lab-on-a-chip devices, Macroscales, Micro and macro, Microfluidics devices, Cavitation, acoustics, biomedicine, blood brain barrier, cell membrane, cell membrane permeability, cell selection, chemoluminescence, cytolysis, DNA extraction, drug delivery system, flow kinetics, futurology, geometry, hydrodynamics, luminescence, micro scale cavitation, microbubble, physics, Review, simulation, surface property, tension, vapor, waste water management, water treatment, lab on a chip
National Category
Fluid Mechanics
Identifiers
urn:nbn:se:kth:diva-324942 (URN)10.1039/d2lc00169a (DOI)000792309300001 ()35531747 (PubMedID)2-s2.0-85132452008 (Scopus ID)
Note

QC 20230327

Available from: 2023-03-27 Created: 2023-03-27 Last updated: 2025-02-09Bibliographically approved
Nordenfur, T., Caidahl, K., Grishenkov, D., Maksuti, E., Marlevi, D., Urban, M. W. & Larsson, M. (2022). Safety of arterial shear wave elastography-ex-vivo assessment of induced strain and strain rates. Biomedical Engineering & Physics Express, 8(5), Article ID 055012.
Open this publication in new window or tab >>Safety of arterial shear wave elastography-ex-vivo assessment of induced strain and strain rates
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2022 (English)In: Biomedical Engineering & Physics Express, E-ISSN 2057-1976, Vol. 8, no 5, article id 055012Article in journal (Refereed) Published
Abstract [en]

Shear wave elastography (SWE) is a promising technique for characterizing carotid plaques and assessing local arterial stiffness. The mechanical stress to which the tissue is subjected during SWE using acoustic radiation force (ARF), leading to strain at a certain strain rate, is still relatively unknown. Because SWEis increasingly used for arterial applications where the mechanical stress could potentially lead to significant consequences, it is important to understand the risks of SWE-induced strain and strain rate. The aim of this study was to investigate the safety of SWE in terms of induced arterial strain and strain rate ex-vivo and in a human carotid artery in-vivo. SWE was performed on six porcine aortae as a model of the human carotid artery using different combinations of ARF push parameters (push voltage: 60/90 V, aperture width: f/1.0/1.5, push length: 100/150/200 mu s) and distance to push position. The largest induced strain and strain rate were 1.46% and 54 s(-1) (90 V, f/ 1.0, 200 mu s), respectively. Moreover, the SWE-induced strains and strain rates increased with increasing push voltage, aperture, push length, and decreasing distance between the region of interest and the push. In the human carotid artery, the SWE-induced maximum strain was 0.06% and the maximum strain rate was 1.58 s(-1), compared with the maximum absolute strain and strain rate of 12.61% and 5.12 s(-1), respectively, induced by blood pressure variations in the cardiac cycle. Our results indicate that ex-vivo arterial SWE does not expose the artery to higher strain rate than normal blood pressure variations, and to strain one order of magnitude higher than normal blood pressure variations, at the push settings and distances from the region of interest used in this study.

Place, publisher, year, edition, pages
IOP Publishing, 2022
Keywords
safety, elastography, shear wave elastography, acoustic radiation force, carotid, arterial stiffness, strain rate
National Category
Cardiology and Cardiovascular Disease
Identifiers
urn:nbn:se:kth:diva-315905 (URN)10.1088/2057-1976/ac7f39 (DOI)000827259000001 ()35797069 (PubMedID)2-s2.0-85134720409 (Scopus ID)
Note

QC 20220728

Available from: 2022-07-28 Created: 2022-07-28 Last updated: 2025-02-10Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0002-3699-396X

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