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  • 1
    Online Resource
    Online Resource
    Labeling of human mesenchymal stem cell: Comparison between paramagnetic and superparamagnetic agents
    AIP Publishing ; 2009
    In:  Journal of Applied Physics Vol. 105, No. 7 ( 2009-04-01)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 105, No. 7 ( 2009-04-01)
    Abstract: Paramagnetic and superparamagnetic substances are used to trace stem cell in living organisms under magnetic resonance imaging (MRI). We compared paramagnetic and superparamagnetic substance for their labeling efficiency by using clinically widely used gadolinium chelates and iron oxide nanoparticles. Without the aid of transfection agent, human mesenchymal stem cells were labeled with each agent separately in different concentration and the optimized concentration was determined by maintaining same cell viability as unlabeled cells. Iron oxide nanoparticle labeling has a detecting threshold of 12 500 cells in vitro, while gadolinium chelates labeling could be detected for at least 50 000 cells. In life animal study, we found there is an eightfold sensitivity in cells labeled with iron oxide superparamagnetic nanoparticles; however, the magnetic susceptibility artifact would obscure the detail of adjacent anatomical structures. We conclude that labeling stem cells with superparamagnetic substance is more efficacious. However, the cells labeled by superparamagnetic nanoparticles might interfere with the interpretation of anatomical structure. These findings would be beneficial to applications of magnetic substances toward stem cell biology and tissue engineering.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.3072821
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 2
    Online Resource
    Online Resource
    Mass transport following impulsive optical excitation
    AIP Publishing ; 2004
    In:  The Journal of Chemical Physics Vol. 120, No. 17 ( 2004-05-01), p. 8031-8038
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 120, No. 17 ( 2004-05-01), p. 8031-8038
    Abstract: Transition from reverse-saturable absorption to saturable absorption of the chloroaluminum phthalocyanine solution excited by a giant laser pulse is ascribed not just to the saturation of excited state absorption, but also to the outward migration of the solute molecules at the laser beam center. While the saturation of excited state absorption occurs within a single picosecond laser pulse, the beam center population decrease is sustained much longer than the pulse duration. We distinguish these two mechanisms with the Z-scan technique, utilizing picosecond pulses with pulse-to-pulse separations ranging from 0.1 to 5.0 s.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.1683074
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2004
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 3
    Online Resource
    Online Resource
    Resonance-enhanced dipolar interaction between terahertz photons and confined acoustic phonons in nanocrystals
    AIP Publishing ; 2008
    In:  Applied Physics Letters Vol. 92, No. 9 ( 2008-03-03)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 92, No. 9 ( 2008-03-03)
    Abstract: Taking advantage of the specific core-shell charge separation structure in the CdSe∕CdTe core-shell type-II nanocrystals, we experimentally observed and verified the existence of the resonance-enhanced dipolar interaction between terahertz photons and their corresponding confined acoustic phonons. From the measured terahertz transmission spectra, we found that the photon frequency of the terahertz resonant absorption is inversely proportional to the diameter D of the nanocrystals and agrees with that of dipolar active l=1, n=0 confined acoustic modes. The corresponding absorption cross section shows a D4 dependence, supporting a charged simple-harmonic-oscillator model. These facts verify the occurrence of dipolar interaction between terahertz photons and confined terahertz acoustic phonons.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.2891062
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2008
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Experimental Study of Premixed Stoichiometric Ethylene/Oxygen/Argon Flame
    AIP Publishing ; 2006
    In:  Chinese Journal of Chemical Physics Vol. 19, No. 5 ( 2006-10-01), p. 379-385
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 19, No. 5 ( 2006-10-01), p. 379-385
    Abstract: A comprehensive experimental study of the premixed ethylene/oxygen/argon flame at 2.667 kPa with a stoichiometric equivalence ratio (=1) was performed with the tunable synchrotron photoionization and molecular-beam sampling mass spectrometry techniques. The isomers of most observed species in the flame were unambiguously identified by measurements of the photoionization efficiency spectra, e.g. C3H4, C2H4O and C4H4. The mole fraction profiles of species up to C7H8 were measured by scanning the burner position at the selected photon energies near ionization thresholds, and the flame temperature profile was obtained by using Pt/Pt-13%Rh thermocouple. Compared with the previous studies, a lot of new flame species: C3H2, C3H3, C3H5, C2H6O, C4H2, C4H4, C4H6, C3H4O, C3H6O, C3H8O, C5H6, C4H8O and C7H8, were observed. A series of free radicals in the flame are detected to be CH3, C2H3, C2H5, HCO, C3H3 and C3H5. Based on the experimental work, a reduced reaction mechanism was developed including 40 species and 223 reactions. Modeling and measurements agree well for the major species and most intermediates. A detailed kinetic model is desired for this flame.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1360/cjcp2006.19(5).379.7
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2006
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 5
    Online Resource
    Online Resource
    Superhydrophobic micro/nanostructured copper mesh with self-cleaning property for effective oil/water separation
    AIP Publishing ; 2019
    In:  Chinese Journal of Chemical Physics Vol. 32, No. 5 ( 2019-10-01), p. 635-642
    Details
    In: Chinese Journal of Chemical Physics, AIP Publishing, Vol. 32, No. 5 ( 2019-10-01), p. 635-642
    Abstract: In this work, a simple method was carried out to successfully fabricate superoleophilic and superhydrophobic N-dodecyltrimethoxysilane@tungsten trioxide coated copper mesh. The as-fabricated copper mesh displayed prominent superoleophilicity and superhydrophobicity with a huge water contact angle about 154.39° and oil contact angle near 0°. Moreover, the coated copper mesh showed high separation efficiency approximately 99.3%, and huge water flux about 9962.3 L·h−1·m−2, which could be used to separate various organic solvents/water mixtures. Furthermore, the coated copper mesh showed favorable stability that the separation efficiency remained above 90% after 10 separation cycles. Benefiting from the excellent photocatalytic degradation ability of tungsten trioxide, the coated copper mesh possessed the self-cleaning capacity. Therefore, the mesh contaminated with lubricating oil could regain superhydrophobic property, and this property of self-cleaning permitted that the fabricated copper mesh could be repeatedly used for oil and water separation.
    Type of Medium: Online Resource
    ISSN: 1674-0068 , 2327-2244
    URL: Article
    DOI: 10.1063/1674-0068/cjcp1810233
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2019
    detail.hit.zdb_id: 2381472-X
    SSG: 6,25
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  • 6
    Online Resource
    Online Resource
    Optofluidic planar reactors for photocatalytic water treatment using solar energy
    AIP Publishing ; 2010
    In:  Biomicrofluidics Vol. 4, No. 4 ( 2010-12-01)
    Details
    In: Biomicrofluidics, AIP Publishing, Vol. 4, No. 4 ( 2010-12-01)
    Abstract: Optofluidics may hold the key to greater success of photocatalytic water treatment. This is evidenced by our findings in this paper that the planar microfluidic reactor can overcome the limitations of mass transfer and photon transfer in the previous photocatalytic reactors and improve the photoreaction efficiency by more than 100 times. The microreactor has a planar chamber (5 cm×1.8 cm×100 μm) enclosed by two TiO2-coated glass slides as the top cover and bottom substrate and a microstructured UV-cured NOA81 layer as the sealant and flow input/output. In experiment, the microreactor achieves 30% degradation of 3 ml 3×10−5M methylene blue within 5 min and shows a reaction rate constant two orders higher than the bulk reactor. Under optimized conditions, a reaction rate of 8% s−1 is achieved under solar irradiation. The average apparent quantum efficiency is found to be only 0.25%, but the effective apparent quantum efficiency reaches as high as 25%. Optofluidic reactors inherit the merits of microfluidics, such as large surface/volume ratio, easy flow control, and rapid fabrication and offer a promising prospect for large-volume photocatalytic water treatment.
    Type of Medium: Online Resource
    ISSN: 1932-1058
    URL: Article
    DOI: 10.1063/1.3491471
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 2265444-6
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  • 7
    Online Resource
    Online Resource
    Physical properties of V 1− x Ti x O2 (0 〈 x 〈 0.187) single crystals
    AIP Publishing ; 2015
    In:  APL Materials Vol. 3, No. 4 ( 2015-04-01)
    Details
    In: APL Materials, AIP Publishing, Vol. 3, No. 4 ( 2015-04-01)
    Abstract: Free standing, low strain, single crystals of pure and titanium doped VO2 were grown out of an excess of V 2O5 using high temperature solution growth techniques. At TMI ∼ 340 K, pure VO2 exhibits a clear first-order phase transition from a high-temperature paramagnetic tetragonal phase (R) to a low-temperature non-magnetic monoclinic phase (M1). With Ti doping, another monoclinic phase (M2) emerges between the R and M1 phases. The phase transition temperature between R and M2 increases with increasing Ti doping while the transition temperature between M2 and M1 decreases.
    Type of Medium: Online Resource
    ISSN: 2166-532X
    URL: Article
    DOI: 10.1063/1.4908245
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
    detail.hit.zdb_id: 2722985-3
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  • 8
    Online Resource
    Online Resource
    Diamond avalanche diodes for obtaining high-voltage pulse with subnanosecond front edge
    AIP Publishing ; 2020
    In:  AIP Advances Vol. 10, No. 6 ( 2020-06-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 10, No. 6 ( 2020-06-01)
    Abstract: In this Letter, we report on demonstrating diamond avalanche diodes for obtaining a high-voltage pulse with a subnanosecond front edge. Under a 2.5 kV driving pulse, the diamond avalanche diodes show a 2.04 kV output and the front edge is 0.894 ns. After repetitive tests, the output voltage wave remains almost the same, indicating good stability. By applying a reverse DC 100 V bias, the front edge shortens to be 0.675 ns, while the rectifier characteristics degrade and the output voltage is limited. Therefore, the reverse bias should be optimized to obtain both the fast front edge and high output voltage. The results show that diamond avalanche diodes have a promising application for high-voltage pulse sources.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0009883
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2583909-3
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  • 9
    Online Resource
    Online Resource
    Enhanced magnetic and magnetodielectric properties of Al-doped gallium ferrite nanoparticles
    AIP Publishing ; 2020
    In:  AIP Advances Vol. 10, No. 1 ( 2020-01-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 10, No. 1 ( 2020-01-01)
    Abstract: In this work, a series of Ga1-xAlxFeO3 (x = 0, 0.1, 0.2, 0.5) nanoparticles was prepared by a modified Pechini method. The influence of Al doping at the Ga site on the structural, magnetic, and magnetodielectric (MD) properties of GaFeO3 nanoparticles was studied. The X-ray diffraction pattern analysis using the Rietveld refinement method indicated that all samples have an orthorhombic structure with Pc21n space group and the value of lattice parameters decrease systematically with increasing Al concentration. Interestingly, the magnetic characterization indicated that with increasing Al-content up to 0.5, the ferrimagnetic transition temperature (TC) increases from 310 to 350 K. It is also found that magnetic hysteresis curves measured below TC exhibit two-phase-like magnetic behavior consisting of hard and soft magnetic phases. Moreover, the simultaneous improvement of magnetic behavior and MD effect of Al-doped GaFeO3 samples are prominent candidates for the applications of room temperature multiferroic devices.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/1.5130051
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 2583909-3
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  • 10
    Online Resource
    Online Resource
    Isothermal swirling flow characteristics and pressure drop analysis of a novel double swirl burner
    AIP Publishing ; 2021
    In:  AIP Advances Vol. 11, No. 3 ( 2021-03-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 11, No. 3 ( 2021-03-01)
    Abstract: Nonreacting swirling flow behavior through a novel double swirl burner has been investigated in this paper using Detached Eddy Simulation (DES) calculations and experimental measurements. The effect of mixing both the swirling flow of the inner jet (primary air or inner swirler) and the swirling flow of the annular jet (secondary air or outer swirler) on the flow structure has been analyzed. Moreover, pressure losses and flow field characteristics have been investigated at different inlet air mass flow rates and combustor diameters. Due to the drawbacks of general pressure loss to predict the pressure drop through high turbulence swirl flow as well as the complex geometry, the time-averaged viscous dissipation field function is used to predict the pressure drop through the burner. This function is based on the relationship between viscous dissipation and pressure losses. DES flow fields are compared with high-speed particle image velocimetry measurements at different inlet air mass flow rates. It is found that there is good agreement between numerical and experimental results, and both the central toroidal recirculation zone and the corner recirculation zone are well captured. In the case of a single inner swirler, the general pressure drop is very high compared to single outer and double swirl generators, and 84% of the inlet air pass through the outer swirler and just 16% of the air pass through the inner swirler in the case of a double burner (partially premixed). The time-averaged viscous dissipation field function is very important to identify the locations that lead to pressure drop inside the burner, which induces to select the appropriate design for the best performance. In addition, it is concluded that the performance of the double swirl burner is more efficient compared with the other two single swirlers in terms of pressure losses and flow structure.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    DOI: 10.1063/5.0041361
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 2583909-3
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