New high fidelity (hi-fi) three-dimensional thermophone CNT sponge

Li, Houyang; Feng, Yanxia; Tong, Zhenzhen; Zhou, Zhenhuan; Xü, Xinsheng; Lim, C.W.

doi:10.1016/j.eml.2021.101523

Cited by 5 publications

(9 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only lately, with the advent of nanotechnology, innovative materials were made available with high thermal conductivity and low heat capacity, − paving the way to efficient thermophone-based transducers. Without any pretension of being exhaustive, we mention efficient thermophones based on carbon nanotubes, − aluminum wires, gold wires, silver wires, graphene, − and boron nitride foams. , Today, due to the advent of nanotechnology, the thermophone, also in its photoacoustic realization, is an object of renewed interest, mainly for its potential in imaging and therapeutic applications. − In this context, a particular effort is dedicated to the study of metal nanotransducers, which have proven to be efficient photoacoustic generators, exploiting their high and tunable optical absorption properties, − high contrast imaging features, and biocompatibility. , …”

Section: Introductionmentioning

confidence: 99%

Acoustic Wave Generation in Nanofluids: Effect of the Kapitza Resistance on the Thermophone to Mechanophone Generation Mechanism Transition

2023

View full text Add to dashboard Cite

High frequency, short wavelength acoustic wave generation in fluids, by means of immersed nanotransducers, is key to applications ranging from the biomedical to the ICT sector, all the way to investigating fundamental aspects of the mechanics of fluids. In this context, the commonly adopted generation mechanism is the thermophone, where the nanotransducer serves as a nanoheater for the surrounding fluid and the acoustic wave is launched by water thermal expansion. Its performance, however, is severely degraded when reaching up to hypersonic frequencies. We analytically investigate the thermoacoustic response in the frequency domain for the case of a gold nanofilm transducer in contact with water. We prove that another generation mechanism, the mechanophone, sets in this critical frequency range, widening the acoustic generation bandwidth. In the mechanophone, it is the nanotransducer thermal expansion that launches pressure waves in water. We find a threshold frequency discriminating between these two regimes, which can be tuned by acting on the Kapitza resistance at the solid−liquid interface. We then show how the mechanophone mechanism can be activated in the frame of photoacoustic generation with pulsed laser sources. The unveiled physics bears generality beyond the specific system and explains the acoustic generation mechanisms in nanofluids.

show abstract

Section: Introductionmentioning

confidence: 99%

Acoustic Wave Generation in Nanofluids: Effect of the Kapitza Resistance on the Thermophone to Mechanophone Generation Mechanism Transition

2023

View full text Add to dashboard Cite

show abstract

“…In this section, the frequency-responses of three models of underwater TA transducers are presented in Figure 2. Comprehensive details on the physical and thermal properties of materials are shown in Table 2, taken from references [44,49,50].…”

Section: Comparison Studies With Experimental and Theoretical Resultsmentioning

confidence: 99%

“…In contrast, when ethanol contacts the CNT sponge directly, it increases the thermal inertia of the sponge and leads to a reduction in the SPL in ethanol [53]. Therefore, the SPL from the open CNT sponge significantly decreases if the CNT sponge has an af- [44]) and water (Feng et al, 2023 [49]); (c) sandwich model in water (Feng, 2023 [51]); (d) encapsulated model in water (Aliev et al, 2023 [34]). In Figure 2a,b, we present a detailed comparative analysis of the thermoacoustic behavior of open CNT sponge in both air and water, respectively.…”

Section: Models Within Different Liquidsmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of Transient Thermoacoustic Characteristics and Performance in Carbon Nanotube Sponge Underwater Transducers

Qi,

Li,

Yin

et al. 2024

Nanomaterials

Self Cite

View full text Add to dashboard Cite

Recent advancements in marine technology have highlighted the urgent need for enhanced underwater acoustic applications, from sonar detection to communication and noise cancellation, driving the pursuit of innovative transducer technologies. In this paper, a new underwater thermoacoustic (TA) transducer made from carbon nanotube (CNT) sponge is designed to achieve wide bandwidth, high energy conversion efficiency, simple structure, good transient response, and stable sound response, utilizing the TA effect through electro-thermal modulation. The transducer has potential application in underwater acoustic communication. An electro-thermal-acoustic coupled simulation for the open model, sandwich model, and encapsulated model is presented to analyze the transient behaviors of CNT sponge TA transducers in liquid environments. The effects of key design parameters on the acoustic performances of both systems are revealed. The results demonstrate that a short pulse excitation with a low duty cycle could greatly improve the heat dissipation of the encapsulated transducer, especially when the thermoacoustic response time becomes comparable to thermal relaxation time.

show abstract

“…Nowadays, with the rapid development of nanotechnology, a kind of nanomaterials having excellent thermoacoustic (TA) effects were fabricated and applied to design TA ultrasonic transducers, such as nanocrystalline silicon [5], CNT film [6][7][8], metal nanowires [9][10][11][12], indium tin oxide film [13,14], graphene film [15] [16][17][18][19][20][21], MXenes [22], graphene foam [23][24][25][26] and CNT sponge [27,28]. When an AC signal is passing through the TA nanomaterials, a thermal gradient is generated within the material due to the effect of Joule heating.…”

Section: Introductionmentioning

confidence: 99%

Design and characteristic analysis of flexible CNT film patch for potential application in ultrasonic therapy

Feng

Zhang

Li³

et al. 2023

Nanotechnology

Self Cite

View full text Add to dashboard Cite

Ultrasonic therapy has drawn increasing attention due to its noninvasiveness, great sensitivity and strong penetration capabilities. However, most of traditional rigid ultrasonic probes cannot achieve a solid interfacial contact with irregular nonplanar surfaces, which leads to unstable therapeutic effects and limitations of widespread use in practical applications. In this paper, a new flexible ultrasonic patch based on carbon nanotube (CNT) films is designed and fabricated to achieve a potential application in ultrasonic therapy. This patch is composed of a CNT film, a thermal protective layer and a heat sinking layer, and has the advantages of simple structure, soft, ultrathin and completely conforming to the treatment area. Theoretical and experimental studies are performed to investigate the acoustic and temperature fields before and after deformation. Effects of key design parameters of the patch on acoustic performances and temperature distributions are revealed. Numerical results indicate that the CNT film patch can produce ultrasounds over a wide frequency range and temperatures under the threshold of burn injury whether it is bent or not. Furthermore, it is also noted that the sound waves emitted from the bending patch are focused at the center of the bending patch, which demonstrates that the target treatment area can be controlled.

show abstract

New high fidelity (hi-fi) three-dimensional thermophone CNT sponge

Cited by 5 publications

References 30 publications

Acoustic Wave Generation in Nanofluids: Effect of the Kapitza Resistance on the Thermophone to Mechanophone Generation Mechanism Transition

Acoustic Wave Generation in Nanofluids: Effect of the Kapitza Resistance on the Thermophone to Mechanophone Generation Mechanism Transition

Analysis of Transient Thermoacoustic Characteristics and Performance in Carbon Nanotube Sponge Underwater Transducers

Design and characteristic analysis of flexible CNT film patch for potential application in ultrasonic therapy

Contact Info

Product

Resources

About