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  • AIP Publishing  (10)
  • 1
    Online Resource
    Online Resource
    Self-assembled ultralight three-dimensional polypyrrole aerogel for effective electromagnetic absorption
    AIP Publishing ; 2015
    In:  Applied Physics Letters Vol. 106, No. 22 ( 2015-06-01)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 106, No. 22 ( 2015-06-01)
    Abstract: A facile self-assembled polymerization method has been used to form pyrrole to an ultralight three-dimensional (3D) polypyrrole (PPy) aerogel. It exhibits an effective electromagnetic absorption (EA) bandwidth (deeper than −10 dB), which was characterized as 6.2 GHz when the filler loading is only 7 wt. % in paraffin based composite. This 3D-PPy aerogel can be considered as a light weight, low adjunction, thin thickness, and high performance EA material.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4921180
    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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  • 2
    Online Resource
    Online Resource
    Thermodynamic driving force of transient negative capacitance of ferroelectric capacitors
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 119, No. 2 ( 2021-07-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 119, No. 2 ( 2021-07-12)
    Abstract: Negative capacitance (NC) field-effect transistors have great potential as next-generation low-power transistors due to their ability to overcome the Boltzmann limit. However, the fundamental physical mechanism of negative capacitance (NC) has not yet been clarified. This paper investigates the thermodynamic driving force of transient NC in the series circuit of a resistor and ferroelectric capacitor (R–FEC). We find that the widely applied Landau–Khalatnikov theory, which describes the minimization of Gibbs free energy, has the limitation to understand transient NC. The thermodynamic driving force of the transient NC is the minimization of the difference between the elastic Gibbs free energy and electric polarization work. Moreover, we find that the appearance of transient NC phenomenon is not due to the widely accepted viewpoint that the ferroelectric polarization goes through the negative curvature region of elastic Gibbs free energy landscape (Ga). Instead, after the energy barrier of Ga disappears, the transient NC phenomenon appears when the electric field across the ferroelectric material reaches local maximum. Furthermore, our results show that this process depends on both the intrinsic parameters of the ferroelectric material and the extrinsic factors in the R–FEC circuit.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0039246
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    A novel approach to expedite wound healing with plasma brush of cold flame
    AIP Publishing ; 2023
    In:  Review of Scientific Instruments Vol. 94, No. 8 ( 2023-08-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 94, No. 8 ( 2023-08-01)
    Abstract: Excessive or persistent infection is a major contributing factor in impeding chronic wound healing. Wound bed preparations using antiseptics do not necessarily target the entire bacterial spectrum, and the highly proliferating granulation tissue may be sensitive to the cytotoxic effects, impairing tissue repair. Non-thermal gas atmospheric pressure plasmas are partially ionized gases that contain highly reactive particles while the gas phase remains near room temperature, thus having the capability of accessing small irregular cavities and fissures and killing bacteria because of the diffusive nature of gas phase plasma species that are chemically reactive, providing an ideal approach to topical wound disinfection. A non-thermal plasma brush device of novel design has been developed that is suitable for clinical application in the disinfection of oral and wound bacteria. In vivo studies have indicated that the plasma brush treatment rendered no harmful effect on healthy skin or tissues, while it could improve wound healing in Pseudomonas aeruginosa biofilm infected wounds exposed to an optimized treatment with argon plus 1% nitrogen (Ar + N2) plasma.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/5.0096969
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 4
    Online Resource
    Online Resource
    Structural and transport properties of epitaxial NaxCoO2 thin films
    AIP Publishing ; 2005
    In:  Applied Physics Letters Vol. 87, No. 17 ( 2005-10-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 87, No. 17 ( 2005-10-24)
    Abstract: We have studied structural and transport properties of epitaxial NaxCoO2 thin films on (0001) sapphire substrate prepared by topotaxially converting an epitaxial Co3O4 film to NaxCoO2 with annealing in Na vapor. The films are c-axis oriented and in-plane aligned with [101¯0]NaxCoO2 rotated by 30° from [101¯0] sapphire. Different Na vapor pressures during the annealing resulted in films with different Na concentrations, which showed distinct transport properties.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2117619
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2005
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Fabrication of flower-like silver nanostructure on the Al substrate for surface enhanced fluorescence
    AIP Publishing ; 2012
    In:  Applied Physics Letters Vol. 100, No. 5 ( 2012-01-30)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 100, No. 5 ( 2012-01-30)
    Abstract: Surface-enhanced fluorescence (SEF) substrates consisting of flower-like nanostructure of electromagnetically coupled silver dendrites on Al surface were manufactured by modified galvanic displacement process between Ag ion and Al at room temperature. Substrate enhancement efficiency, which was evaluated from SEF intensities of the adsorbed Rhodamine 6 G(Rh6G), was found to increase rapidly with reaction time. The observation highlights the importance of strong coupling effects between nanobranches in SEF. The variation of SEF efficiency can be qualitatively explained with local surface plasmon resonance model of coupled silver nanostructures.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3681420
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2012
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Evidence of the formation and conversion of unstable thionyl isocyanate: Gas-phase spectroscopic studies
    AIP Publishing ; 2006
    In:  The Journal of Chemical Physics Vol. 125, No. 23 ( 2006-12-21)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 125, No. 23 ( 2006-12-21)
    Abstract: Thionyl diisocyanate which is unstable at ambient temperature is generated from a heterogeneous reaction of gaseous thionyl dichloride with silver cyanate and studied for the first time in the gas phase at 298K. N-isocyanatoformyl sulfinylimide is also observed with photoelectron spectroscopy in the gas phase for the first time. The conversion of thionyl diisocyanate to N-isocyanatoformyl sulfinylimide via 1,3 shift at different temperatures is studied by using photoelectron spectroscopy and mass spectroscopy with the help of theoretical computations. On the basis of combined observations and quantum chemical calculations, possible 1,3-isocyanato shifts and dissociation processes for thionyl isocyanate and its cation have been discussed in detail.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.2403136
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 7
    Online Resource
    Online Resource
    Interfacial synthesis of polypyrrole microparticles for effective dissipation of electromagnetic waves
    AIP Publishing ; 2015
    In:  Journal of Applied Physics Vol. 118, No. 20 ( 2015-11-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 118, No. 20 ( 2015-11-28)
    Abstract: A strategy has been adopted to regulate the dielectric properties of polypyrrole microparticles for good electromagnetic absorption performance through an interfacial synthesis process. Classical Debye relaxation theory and resistor-capacitor model have been employed to illustrate the electromagnetic dissipation mechanism of polypyrrole microparticles. The prepared polypyrrole microparticles exhibit an effective electromagnetic absorption bandwidth 5.48 GHz (deeper than −10 dB) from 12.52 to 18 GHz with a filler loading of 15 wt. % in paraffin. It was demonstrated that the morphologies of conducting polymers can significantly affect the dissipation of electromagnetic waves, supplying a strategy for the design of effective electromagnetic absorption materials.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4936549
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    An organic dye with very large Stokes-shift and broad tunability of fluorescence: Potential two-photon probe for bioimaging and ultra-sensitive solid-state gas sensor
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 108, No. 1 ( 2016-01-04)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 108, No. 1 ( 2016-01-04)
    Abstract: Light-emitting nonlinear optical molecules, especially those with large Stokes shifts and broad tunability of their emission wavelength, have attracted considerable attention for various applications including biomedical imaging and fluorescent sensors. However, most fluorescent chromophores have only limited potential for such applications due to small Stokes shifts, narrow tunability of fluorescence emissions, and small optical nonlinearity in highly polar solvents. In this work, we demonstrate that a two-photon absorbing stilbene chromophore exhibits a large two-photon absorption action cross-section (ηδ = 320 GM) in dimethylsulfoxide (DMSO) and shows broad fluorescence tunability (125 nm) by manipulating the polarity of the surrounding medium. Importantly, a very large Stokes shift of up to 227 nm is achieved in DMSO. Thanks to these features, this chromophore can be utilized as a two-photon probe for bioimaging applications and in an ultrasensitive solid-state gas detector.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4939232
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
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  • 9
    Online Resource
    Online Resource
    Cyclic tensile machine with wide speed range for in situ neutron/X-ray scattering study on elastomers
    AIP Publishing ; 2020
    In:  Review of Scientific Instruments Vol. 91, No. 1 ( 2020-01-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 91, No. 1 ( 2020-01-01)
    Abstract: A tensile machine is designed for in situ scattering investigation of elastomers in the cyclic tensile process. The specimen is stretched by two linearly moving clamps in the opposite direction; thus, the center of the specimen is kept stationary during the tensile test. With this configuration, either X-ray scattering or neutron scattering can be carried out easily. A high speed direct current motor is used to drive the machine, providing a wide tensile speed range from 1.28 × 10−3 mm/s to 102.4 mm/s. Cyclic tension is achieved by program controlled motor rotation, and the engineering stress–strain curve can be saved automatically in each cycle. Moreover, an independent displacement sensor is used to check the possible accumulative error of position during cyclic tension. The orientation change of multiwall carbon nanotube filled silicon rubber is investigated by small angle neutron scattering to test the machine, which shows that the machine is capable of combining the cyclic tensile test with in situ scattering measurement.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/1.5128047
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
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  • 10
    Online Resource
    Online Resource
    Fabrication of fluoropolymer piezoelectrets by using rigid template: Structure and thermal stability
    AIP Publishing ; 2010
    In:  Journal of Applied Physics Vol. 108, No. 6 ( 2010-09-15)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 108, No. 6 ( 2010-09-15)
    Abstract: Fluorocarbon films with regular void structure, made of compact fluoroethylenepropylene (FEP), or skived polytetrafluoroethylene (PTFE), and patterned porous PTFE layers, are successfully fabricated by using a rigid template and fusion bonding process. A corona charging technique is used to make the films piezoelectric, i.e., to be piezoelectrets. The results show that the typical Young’s moduli of the films are in the range of 0.45–0.80 MPa. A maximum quasistatic piezoelectric d33 coefficient up to 500 pC/N is achieved. Compared to the laminated FEP/porous PTFE piezoelectrets without regular void structure, the presently fabricated films show significantly improved thermal stability. Furthermore, when the films are designed, fabricated, and corona charged such that positive charges are deposited in the porous PTFE layers, the thermal stability of d33 coefficients can be further improved. For example, after annealing at 90 °C for 4500 min, these samples have a remaining d33 value of 86% compared with 77% for samples where positive charges are deposited in both, the porous PTFE and the compact FEP layers.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3482011
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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