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  • Online Resource  (90)
  • AIP Publishing  (90)
  • 1
    Online Resource
    Online Resource
    Enhanced air stability of superhydrophobic surfaces with flexible overhangs of re-entrant structures
    AIP Publishing ; 2021
    In:  Physics of Fluids Vol. 33, No. 2 ( 2021-02-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 33, No. 2 ( 2021-02-01)
    Abstract: The stability of air plastron entrapped in a submerged superhydrophobic (SHPo) surface determines the sustainability of the surface properties including drag reduction, self-cleaning, and anti-icing. To increase the stability for high water pressure, various microstructures have been adopted for SHPo surfaces. A re-entrant structure is a typical example to provide high stability for air plastrons. This work proposes flexible overhangs of the re-entrant structures as a new strategy for additional stability. Several SHPo surfaces with re-entrant structures of different sizes are fabricated, and their Young's moduli (E) are controlled from 715.3 kPa to 2509 kPa. Pressurization of water and air diffusion from the plastrons to the surrounding water cause deformation of the air–water meniscus until air plastron disruption starts to occur. The critical water pressure for air plastron disruption is gradually increased as the E of the overhangs decreases. The critical value is also increased as the gap distance between the adjacent overhangs increases. When the water pressure is less than the critical value, the air plastron is also gradually disrupted by the air diffusion. The lifetime elapsed to the air disruption increases by 19%–44% as the value of E decreases. The present results would pave the way for utilizing flexible overhangs of re-entrant structures as a novel approach for increasing the air stability of SHPo surfaces.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0037909
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
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  • 2
    Online Resource
    Online Resource
    Water-repellent and self-attachable flexible conductive patch
    AIP Publishing ; 2023
    In:  Applied Physics Letters Vol. 123, No. 7 ( 2023-08-14)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 123, No. 7 ( 2023-08-14)
    Abstract: Achieving exceptional water-repellency and reliable reversible adhesion is crucial for the development of wearable flexible electronics. However, simultaneously achieving these properties presents a significant challenge, as water-repellency requires maximizing the presence of air while robust adhesion necessitates enhancing the solid fraction. In this study, we present a flexible and transparent conductive patch that addresses this challenge by offering simultaneous robust superhydrophobicity and strong adhesion in both dry and wet conditions. The device incorporates a unique combination of overhang micropillars, microgrids and a percolating network of carbon nanotubes. The proposed patch demonstrates outstanding water repellency with a contact angle exceeding 150°, while delivering impressive dry adhesion ( & gt;200 kPa) and wet adhesion ( & gt;150 kPa) performance. Furthermore, the device exhibits tunable electrical conductivity and optical transmittance.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0160217
    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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  • 3
    Online Resource
    Online Resource
    Microstress relaxation effect of Pb(Zr0.52Ti0.48)O3 films with thicknesses for micro/nanopiezoelectric device
    AIP Publishing ; 2010
    In:  Applied Physics Letters Vol. 96, No. 9 ( 2010-03-01)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 96, No. 9 ( 2010-03-01)
    Abstract: In this study, we analyzed the microstress of Pb(Zr0.52Ti0.48)O3 (PZT) films using Raman spectrum and the macrostress using the wafer curvature method. Based on the stress analysis, we also determined the relationship between the residual stress and piezoelectric properties. We found that a thickness of 1 μm was critical since the stress relaxation starts due to surface roughening. Similarly, the film thickness dependence of the piezoelectric coefficient had saturation values around 1 μm, where the preferred orientation started to change from (111) to (110), indicating that the piezoelectric response was related to the stress relaxation with a preferred orientation change.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3330897
    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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  • 4
    Online Resource
    Online Resource
    Effect of leaning angle of gecko-inspired slanted polymer nanohairs on dry adhesion
    AIP Publishing ; 2010
    In:  Applied Physics Letters Vol. 96, No. 4 ( 2010-01-25)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 96, No. 4 ( 2010-01-25)
    Abstract: We present analysis of adhesion properties of angled polymer nanohairs with a wide range of leaning angles from 0° to 45° and ultraviolet (UV)-curable polyurethane acrylate (PUA) materials of two different elastic moduli (19.8 and 320 MPa). It is demonstrated that shear adhesion and adhesion hysteresis can be greatly enhanced by increasing the leaning angle of nanohairs both for soft and hard materials due to increased contact area and reduced structural stiffness.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3298554
    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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  • 5
    Online Resource
    Online Resource
    Impact of surface properties on the dielectric breakdown for polycrystalline and multilayered BaTiO3 thin films
    AIP Publishing ; 1997
    In:  Journal of Applied Physics Vol. 82, No. 12 ( 1997-12-15), p. 6203-6208
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 82, No. 12 ( 1997-12-15), p. 6203-6208
    Abstract: The dielectric reliability for polycrystalline and multilayered BaTiO3 thin films has been evaluated using time-zero and time-dependent dielectric breakdown techniques. The histogram of dielectric breakdown for multilayered BaTiO3 thin films showed a typical Weibull distribution in contrast to a random distribution when compared with polycrystalline BaTiO3 thin films. The measurement resulted in that the 400 nm-thick multilayered BaTiO3 thin film sustained about 105 hour-long operation at 1 MV/cm, showing superior properties when compared with polycrystalline. The smaller leakage current level was obtained for a multilayered BaTiO3 film having a relatively thick underlayer of polycrystalline BaTiO3 film. The value of the breakdown field was smaller at the thicker multilayered BaTiO3 while the distribution of the breakdown widened for thicker film. Analysis of the roughness for the films confirmed that the field breakdown mechanism (e.g., lowering and spreading) is related to the surface roughness of the topmost layer which varies with the thickness of underlying polycrystalline BaTiO3. The reduced leakage current at the thick multilayered BaTiO3 was due to the presence of a wide transition layer between polycrystalline and amorphous BaTiO3.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.366505
    Language: English
    Publisher: AIP Publishing
    Publication Date: 1997
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    Dominant surface stress driven by biomolecular interactions in the dynamical response of nanomechanical microcantilevers
    AIP Publishing ; 2006
    In:  Applied Physics Letters Vol. 89, No. 17 ( 2006-10-23)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 89, No. 17 ( 2006-10-23)
    Abstract: Nanomechanical microcantilevers have played a vital role in detecting biomolecular interactions. The ability of microcantilevers to detect biomolecular interactions is ascribed to the principle that the surface stress, caused by biomolecular interactions, dominates the dynamical response of the microcantilever. Here we have experimentally studied the correlation between biomolecular interactions and the dynamical response of microcantilevers. Moreover, the authors employed a mechanical beam model to calculate the surface stress, representing the biomolecular interactions, through measuring the resonant frequency shift. The quantitative analysis of surface stress, driven by the specific protein-protein interactions, demonstrated that microcantilevers enable the quantitative study of biomolecular interactions.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2372700
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Effect of mass and stress on resonant frequency shift of functionalized Pb(Zr0.52Ti0.48)O3 thin film microcantilever for the detection of C-reactive protein
    AIP Publishing ; 2004
    In:  Applied Physics Letters Vol. 84, No. 16 ( 2004-04-19), p. 3187-3189
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 84, No. 16 ( 2004-04-19), p. 3187-3189
    Abstract: A micromachined PZT (52/48) thin film cantilever composed of SiO2/Ta/Pt/PZT/Pt/SiO2 on a SiNx supporting layer for simultaneous self-exciting and sensing was fabricated. We present the resonant frequency change of piezoelectric microcantilevers due to a combination of mass loading and spring constant variation arisen from antigen-antibody interaction of C-reactive protein (CRP). Experimentally measured resonant frequency shift is larger than that of theoretically calculated resonant frequency by two orders of magnitude due to a compressive stress arising from CRP antigen-antibody interaction. The changes in normalized resonant frequency shift δf expt/f1 expt were found to increase as the value of 40.5, 74.7, and 185×10−4 as the CRP antibody site ratio, increased 10%, 50%, and 100%, respectively.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.1712028
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    Effect of indium composition on carrier escape in InGaN/GaN multiple quantum well solar cells
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 103, No. 3 ( 2013-07-15)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 103, No. 3 ( 2013-07-15)
    Abstract: The influence of indium composition on carrier escape was studied considering recombination in InGaN/GaN multiple quantum well solar cells with indium compositions of 17% and 25%. Competition between tunneling and recombination turned out to act as a crucial role for the short-circuit current density (Jsc) and fill factor (FF). To enhance the Jsc and the FF, the tunneling-dominant carrier decay rather than recombination is required in the operating range of the solar cells which is possible by optimizing the band structures for a shorter tunneling time and by improving the crystalline quality for a longer recombination time.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4813623
    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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  • 9
    Online Resource
    Online Resource
    Tunable sheathless microfluidic focusing using ion concentration polarization
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 107, No. 8 ( 2015-08-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 107, No. 8 ( 2015-08-24)
    Abstract: In this study, we developed a tunable sheathless focusing method for focusing micrometer- and nanometer-sized particles, using ion concentration polarization (ICP) in an ion-selective, resin-coated channel. The particle movement was regulated using an electric field, and by varying the flow rate and ionic strength of the liquid solution; various phenomena were observed, depending on the particle properties. Here, we provide insights into the physical basis of the ICP-focusing phenomena, and a statistical approach for analyzing the particle movement. This ICP-focusing technology is an approach that could be applied for the separation and sorting of various particles, including cells, proteins, and bacteria.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4929816
    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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  • 10
    Online Resource
    Online Resource
    Piezoelectric layer embedded-microdiaphragm sensors for the determination of blood viscosity and density
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 105, No. 15 ( 2014-10-13)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 105, No. 15 ( 2014-10-13)
    Abstract: We introduce a lead zirconate titanate [PZT; Pb(Zr0.52Ti0.48)O3] microdiaphragm resonating sensor packaged in a polydimethylsiloxane chip. The proposed sensor can measure the density and viscosity of a liquid that is within the density and viscosity regime of blood (1.060 × 103 kg/m3, 3–4 cP). To verify the basic characteristics of the sensor, viscous solutions were prepared from glycerol and deionized water with a density in the range from 0.998 to 1.263 × 103 kg/m3 and a viscosity in the range from 1 to 1414 cP. We measured the frequency responses of the sensor before and after injecting the viscosity- and density-controlled liquid under the bottom of the microdiaphragm. The resonant frequencies in the (1,1) and (2,2) modes decreased linearly as a function of the liquid density in the range from 0.998 to 1.146 × 103 kg/m3 with a sensitivity of 28.03 Hz/kg·m−3 and 81.85 Hz/kg·m−3, respectively. The full width at half maximum had a logarithmic relationship with the liquid viscosity in the viscosity range from 1 to 8.4 cP. The quality factor (Q-factor) for the 50% glycerol/water mixture was determined to be greater than 20 for both the (1,1) and the (2,2) modes, indicating that the microdiaphragm resonating sensor is suitable for measuring the density and viscosity of a liquid within a density range from 0.998 to 1.1466 × 103 kg/m3 and a viscosity range from 1 to 8.4 cP. These density and viscosity ranges span the regime of possible changes of blood characteristics. The microdiaphragm resonating sensors were also tested with a real human serum to verify that the sensor is suitable for measuring the viscosity and density of blood. Therefore, the PZT microdiaphragm resonating sensor could be utilized for early diagnosis of diseases associated with changes in the physical properties of blood.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4898637
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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