Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound

Jonnalagadda, Umesh Sai; Su, Xq; Kwan, James J.

doi:10.1016/j.ultsonch.2021.105530

Cited by 17 publications

(15 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Investigating the double-bubble dynamics is beneficial for exploring the dynamics of bubble group. Some publications suggest that burst ultrasound can improve chemical reaction efficiency [13] , [14] . Besides, burst ultrasound is widely used with microbubbles in medical treatment [15] .…”

Section: Introductionmentioning

confidence: 99%

Dynamics of double bubbles under the driving of burst ultrasound

Wang

Chen

Zhou

et al. 2022

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 99%

Dynamics of double bubbles under the driving of burst ultrasound

Wang

Chen

Zhou

et al. 2022

Ultrasonics Sonochemistry

View full text Add to dashboard Cite

“…Kwan et al, developed GSNs using divinylbenzene crosslinked poly(methyl methacrylate) (PMM) coated polystyrene (PS) nanocups [ 37 ]. Later similar GSNs have also been developed using different nanoparticles; gold nanocones, titanium dioxide nanocups, and multi-cavity poly lactic-co-glycolic acid (PLGA) particles [ 47 , 81 , 88 ]. These cup-shaped particles are believed to entrap gas pockets in their cavities, which in turn can generate micron-sized bubbles under ultrasound irradiation.…”

Section: Gas Stabilizing Nanoparticles (Gsns) As Exogenous Nuclei For Acoustic Cavitationmentioning

confidence: 99%

“…Kwan and coworkers [ 88 ] prepared GSNs based on titanium dioxide nanocups as both a cavitation agent and a sonosensitizer. They found that cavitation events could significantly improve the ROS generation capability of titanium dioxide nanoparticles under ultrasound sonication (33% duty cycle) using a focused ultrasound transducer with a frequency of 0.5 or 1.1 MHz and PNPs of 0.1–8 MPa.…”

Section: Applications Of Gsns In Ultrasound Theranostics Of Cancermentioning

confidence: 99%

Gas-stabilizing nanoparticles for ultrasound imaging and therapy of cancer

Sabuncu

Yıldırım

2021

Nano Convergence

View full text Add to dashboard Cite

The use of ultrasound in the clinic has been long established for cancer detection and image-guided tissue biopsies. In addition, ultrasound-based methods have been widely explored to develop more effective cancer therapies such as localized drug delivery, sonodynamic therapy, and focused ultrasound surgery. Stabilized fluorocarbon microbubbles have been in use as contrast agents for ultrasound imaging in the clinic for several decades. It is also known that microbubble cavitation could generate thermal, mechanical, and chemical effects in the tissue to improve ultrasound-based therapies. However, the large size, poor stability, and short-term cavitation activity of microbubbles limit their applications in cancer imaging and therapy. This review will focus on an alternative type of ultrasound responsive material; gas-stabilizing nanoparticles, which can address the limitations of microbubbles with their nanoscale size, robustness, and high cavitation activity. This review will be of interest to researchers who wish to explore new agents to develop improved methods for molecular ultrasound imaging and therapy of cancer.

show abstract

“…TiO 2 was selected as it is a well-known material for photo-and sonocatalysis, [4c,15] and our nanostructure (TiO 2 open nanoshell, or TON) permits gas stabilization onto the catalyst surface, where cavitation events may occur exclusively, as opposed to stochastically in the fluid media. [16] In doing so, sonoluminescence can be efficiently absorbed by the photoactive surface of TiO 2 , leading to the facile generation of ROS, e. g., hydroxyl radicals and singlet oxygen via water sonolysis and sonoluminescence-induced photolysis (see Figure 1b). [ 4c,15b,16] These ROS are then utilized by the AuPd nanoalloys supported on the TiO 2 nanostructure (AuPd/TON).…”

Section: Introductionmentioning

confidence: 99%

Nanostructured Sonophotocatalysts for spatially controlled inertial cavitation towards energy‐efficient sonochemistry

Jonnalagadda

Fan

et al. 2022

ChemCatChem

Self Cite

View full text Add to dashboard Cite

Catalytic nanomaterials have been demonstrated to enhance sonochemical processing through interactions with inertial cavitation events. Typically, sonochemistry generates inertial cavitation events directly from the solvent, which results in spatially uncontrolled cavitation events with limited interaction with the catalytic active site. These high intensity acoustic fields also result in thermal effects and side reactions, which may further influence chemical yields and selectivity. Herein, we report on ultrasound-responsive structured AuPd/TiO 2 open nanoshells (TONs) to surface-stabilize gas bubbles for promot-ing cavitation events in the vicinity of catalytic active site. These exogenous bubbles trapped on catalytic active sites readily cavitate to produce free radicals for chemical reactions. Our findings indicate a positive trend between cavitation and benzaldehyde production in the presence of our AuPd/TONs. In contrast, nanostructures without gas-stabilization demonstrate reduced sonochemical conversion, suggesting the catalytic potential of nanostructuring photocatalytic materials to function as both cavitation agents and photo-oxidative catalysts, or photocatalytic nanostructure (PCN).

show abstract

Nanostructured TiO2 cavitation agents for dual-modal sonophotocatalysis with pulsed ultrasound

Abstract: Graphical abstract

Cited by 17 publications

References 59 publications

Dynamics of double bubbles under the driving of burst ultrasound

Dynamics of double bubbles under the driving of burst ultrasound

Gas-stabilizing nanoparticles for ultrasound imaging and therapy of cancer

Nanostructured Sonophotocatalysts for spatially controlled inertial cavitation towards energy‐efficient sonochemistry

Contact Info

Product

Resources

About