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  • AIP Publishing  (127)
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  • AIP Publishing  (127)
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  • 1
    Online Resource
    Online Resource
    A novel thermal acoustic device based on vertical graphene film
    AIP Publishing ; 2019
    In:  AIP Advances Vol. 9, No. 7 ( 2019-07-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 9, No. 7 ( 2019-07-01)
    Abstract: Graphene is an excellent thermoacoustic material due to its small heat capacity per unit area. However, there is obvious thermal leakage from the substrate which lower the sound emission efficiency. Here, in order to improve the efficiency, vertical graphene has been used as thermoacoustic device. In this paper, the high-quality vertical graphene was prepared by the MPCVD method, and the height of the vertical graphene was about 3.4 μm. Then a thermoacoustic device was fabricated based on vertical graphene. Compared to graphene, the unique structure of vertical graphene makes the device less area to substrate with less thermal leakage and can produce a higher sound pressure level (SPL) per unit area under the same height, the SPL value can reach as high as 60 dB at a measure distance of 0.3 cm with input power of 1.2W. This sound device based on vertical graphene is potential to be used in a wide range of applications.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5096220
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2583909-3
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  • 2
    Online Resource
    Online Resource
    Low-voltage, large-strain soft electrothermal actuators based on laser-reduced graphene oxide/Ag particle composites
    AIP Publishing ; 2018
    In:  Applied Physics Letters Vol. 112, No. 13 ( 2018-03-26)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 112, No. 13 ( 2018-03-26)
    Abstract: In this paper, low-voltage, large-strain flexible electrothermal actuators (ETAs) based on laser-reduced graphene oxide (LRGO)/Ag particle composites were fabricated in a simple and cost-efficient process. By adding Ag particles to the LRGO, the sheet resistance decreased effectively. Under a driving voltage of 28 V, the actuator obtained a bending angle of 192° within 6 s. Besides, the bending deformation could be precisely controlled by the driving voltage ranging from 10° to 192°. Finally, a gripper composed of two actuators was demonstrated to manipulate a piece of polydimethylsiloxane block. With the advantages of low-voltage, fast-response, and easy-to-manufacture, the graphene based ETAs have a promising application in soft robotics and soft machines.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5020918
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Wearable microfluidic patch with integrated capillary valves and pumps for sweat management and multiple biomarker analysis
    AIP Publishing ; 2022
    In:  Biomicrofluidics Vol. 16, No. 4 ( 2022-07-01)
    Details
    In: Biomicrofluidics, AIP Publishing, Vol. 16, No. 4 ( 2022-07-01)
    Abstract: Wearable sweat sensors are essential for providing insight into human physiological health. The currently developed microfluidic sweat sensors have demonstrated the function of collecting and storing sweat. However, they detect more average concentrations of substances based on time periods, which leads to the fact that in situ real-time measurement for multiple biomarkers remains a grand challenge. Here, we propose a wearable epidermal microfluidic patch with integrated microfluidic pumps and micro-valves for accelerated and continuous collection of the sweat, where the micro-pumps ensure the complete separation of old and new sweat for real-time detection of real concentration of biomarkers in sweat. The biomarker concentration at different time periods is detected by introducing a burst valve, which is used to assist in the analysis of the real-time detection. A quantitative relationship between the minimum burst pressure difference required for sequential collection and the size of the microchannel structure is established to overcome the effects of additional resistance at the gas–liquid interface. Additionally, the sensing modules, including sodium ion, chlorine ion, glucose, and pH level in sweat, are integrated into the patch to realize in situ, real-time detection of multiple biomarkers in the human sweat, decoding the correlation between changes in substance concentrations and physiological conditions. This work provides a unique and simplifying strategy for developing wearable sweat sensors for potential applications in health monitoring and disease diagnostics.
    Type of Medium: Online Resource
    ISSN: 1932-1058
    URL: Article
    DOI: 10.1063/5.0092084
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 2265444-6
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  • 4
    Online Resource
    Online Resource
    Polarization-dependent optical absorption of graphene under total internal reflection
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 102, No. 2 ( 2013-01-14)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 102, No. 2 ( 2013-01-14)
    Abstract: It is shown that graphene exhibits strong polarization-dependent optical absorption under total internal reflection. Compared with universal absorbance of 2.3%, larger absorption was observed in monolayer, bilayer, and few-layer graphenes for transverse electric (TE) wave under total internal reflection. Our result indicates that reflectance ratio of transverse magnetic wave to TE waves can easily provide the information of number of graphene layers. Furthermore, the enhanced light-graphene coupling in a wide spectral range will be great potential in many applications such as photodetector, photovoltaics, and optical sensor.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4776694
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Droplet actuation by coupling corona discharge and contact electrification: Domino coalescence and uphill braking
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 123, No. 6 ( 2023-08-07)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 123, No. 6 ( 2023-08-07)
    Abstract: Directed transport and control of droplets is essential for many modern technologies. Here, we propose an active control mode that combines corona discharge and contact electrification to efficiently drive the droplet or droplet group in a directed manner. In particular, we also implement a continuous coalescence of droplets, similar to dominoes. Moreover, due to the high adhesion effect caused by contact electrification, the droplet can stick on a slope without sliding down, even when the corona discharge is turned off. Interestingly, it can easily slide down when a conductor is nearby. Therefore, a droplet climbing, braking, and downhill system can be realized, and the gravitational potential energy stored by the droplet can be effectively regulated by the applied voltage. This work opens the possibility of droplet manipulation in modern applications such as miniaturized energy storage, biochemical medicine, and self-cleaning.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0159239
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Anneal-induced enhancement of refractive index and hardness of silicophosphate glasses containing six-fold coordinated silicon
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 106, No. 2 ( 2015-01-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 106, No. 2 ( 2015-01-12)
    Abstract: A considerable number of optical devices have significantly benefited from the development of phosphate glasses as substrate materials. Introducing silica into sodium phosphate is an effective method to enhance its mechanical and optical properties. Through annealing treatment, the tetrahedral silicon oxide network structure (Si(4)) can be transformed into an octahedral structure (Si(6)) with more constraints. Here, we use high-temperature Raman and Nuclear Magnetic Resonance to reveal the mechanism of transformation between the Si(4) and Si(6) silicon oxide structures. The increase of the Si(6) content results in the phosphate glasses having higher refractive index and hardness. Based on this, the refractive index contribution of SiO6 is obtained.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4905839
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Effect of a single repeat sequence of the human telomere d(TTAGGG) on structure of single-stranded telomeric DNA d[AGGG(TTAGGG)6]
    AIP Publishing ; 2018
    In:  Chinese Journal of Chemical Physics Vol. 31, No. 5 ( 2018-10-01), p. 635-640
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 31, No. 5 ( 2018-10-01), p. 635-640
    Abstract: The structures of human telomeric DNA have received much attention due to its significant biological importance. Most studies have focused on G-quadruplex structure formed by short telomeric DNA sequence, but little is known about the structures of long single-stranded telomeric DNAs. Here, we investigated the structure of DNA with a long sequence of d[AGGG(TTAGGG)6] (G6-DNA) and the effect of a single repeat sequence d(TTAGGG) (G01-DNA) on the structure of G6-DNA using sedimentation velocity technique, polyacrylamide gel electrophoresis, circular dichroism spectroscopy, and UV melting experiments. The results suggest that the G6-DNA can form dimers in aqueous solutions and G01-DNA can form additional G-quadruplex structures by binding to G6-DNA. However, G01-DNA has no effect on the structure of DNA with a sequence of d[AGGG(TTAGGG)3] (G3-DNA). Our study provides new insights into the structure polymorphism of long human single-stranded telomeric DNA.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/31/cjcp1804069
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 8
    Online Resource
    Online Resource
    Thermoreflectance imaging of electromigration evolution in asymmetric aluminum constrictions
    AIP Publishing ; 2018
    In:  Journal of Applied Physics Vol. 123, No. 3 ( 2018-01-21)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 123, No. 3 ( 2018-01-21)
    Abstract: Electromigration (EM) is a phenomenon whereby the flow of current in metal wires moves the underlying atoms, potentially inducing electronic interconnect failures. The continued decrease in commercial lithographically defined feature sizes means that EM presents an increasing risk to the reliability of modern electronics. To mitigate these risks, it is important to look for novel mechanisms to extend lifetime without forfeiting miniaturization. Typically, only the overall increase in the interconnect resistance and failure voltage are characterized. However, if the current flows non-uniformly, spatially resolving the resulting hot spots during electromigration aging experiments may provide better insights into the fundamental mechanisms of this process. In this study, we focus on aluminum interconnects containing asymmetric reservoir and void pairs with contact pads on each end. Such reservoirs are potential candidates for self-healing. Thermoreflectance imaging was used to detect hot spots in electrical interconnects at risk of failure as the voltage was gradually increased. It reveals differential heating with increasing voltage for each polarity. We find that while current flow going from a constriction to a reservoir causes a break at the void, the identical structure with the opposite polarity can sustain higher current (J = 21 × 106 A/cm2) and more localized joule heating and yet is more stable. Ultimately, a break takes place at the contact pad where the current flows from narrow interconnect to larger pads. In summary, thermoreflectance imaging with submicron spatial resolution provides valuable information about localized electromigration evolution and the potential role of reservoirs to create more robust interconnects.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.5005938
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 9
    Online Resource
    Online Resource
    Electrically pumped ultraviolet random lasing from ZnO films: Compensation between optical gain and light scattering
    AIP Publishing ; 2010
    In:  Applied Physics Letters Vol. 97, No. 25 ( 2010-12-20)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 97, No. 25 ( 2010-12-20)
    Abstract: We have demonstrated the compensation between optical gain and light scattering in electrically pumped random lasing (RL) from ZnO films through investigating the electroluminescence of MgxZn1−xO/ZnO (x=0.25 and 1) heterostructured devices. As the active ZnO films are sol-gel derived, both heterostructured devices can be electrically pumped into RL at appropriate forward currents. While the active ZnO films are prepared by sputtering, only the MgO/ZnO heterostructured devices can generate RL pumped with sufficient forward currents. It is believed that the light scattering in the sputtered ZnO films is weaker than that in the sol-gel derived ones. However, the inferior light scattering capability of the sputtered ZnO films can be compensated by the MgO/ZnO-heterostructure-enabled higher optical gain in the electrically pumped RL.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3531960
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Numerical investigation of aero-optical effects of flow past a flat-windowed cylindrical turret
    AIP Publishing ; 2020
    In:  Physics of Fluids Vol. 32, No. 5 ( 2020-05-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 32, No. 5 ( 2020-05-01)
    Abstract: Improved delayed detached eddy simulation is performed to investigate aero-optical distortions induced by Mach 0.5 flow over a cylindrical turret with a flat window at a Reynolds number of Re = 5.9 × 105 based on the turret radius. Optical wave-front distortions and associated far-field intensities at elevation angles of 90°, 100°, and 120° are calculated using the geometric ray-tracing method and Fourier optics theory, respectively. The time-averaged properties of the flow fields and the optical distortions are compared with the experimental results, and reasonable agreements are obtained. It is shown that large-scale coherent structures significantly increase the optical distortions and, consequently, degrade the optical performance in terms of the far-field intensity level, while the optical effects of the attached turbulent boundary layers and separation bubbles are trivial and negligible. Very little difference is observed in both instantaneous and statistical optical results calculated with and without defocus and astigmatism components, indicating the adequacy of the removing piston and tilt components for aiding in the design of adaptive optical systems. Both co-flow and blowing jet fluid control methods are introduced with a steady mass flow to alleviate wave-front distortions, and preliminary simulations demonstrate the practicability of these fluid control methods in suppressing the optical distortions. It is shown that both the active control methods are competent to reduce the overall wave-front root-mean-square of the optical path difference.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/1.5144704
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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