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  • AIP Publishing  (20)
  • 1
    Online Resource
    Online Resource
    Theory of mobility of inhomogeneous-polymer-grafted particles
    AIP Publishing ; 2023
    In:  The Journal of Chemical Physics Vol. 158, No. 20 ( 2023-05-28)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 158, No. 20 ( 2023-05-28)
    Abstract: We develop a theory for the motion of a particle grafted with inhomogeneous bead-spring Rouse chains via the generalized Langevin equation (GLE), where individual grafted polymers are allowed to take different bead friction coefficients, spring constants, and chain lengths. An exact solution of the memory kernel K(t) is obtained for the particle in the time (t) domain in the GLE, which depends only on the relaxation of the grafted chains. The t-dependent mean square displacement g(t) of the polymer-grafted particle is then derived as a function of the friction coefficient γ0 of the bare particle and K(t). Our theory offers a direct way to quantify the contributions of the grafted chain relaxation to the mobility of the particle in terms of K(t). This powerful feature enables us to clarify the effect on g(t) of dynamical coupling between the particle and grafted chains, leading to the identification of a relaxation time of fundamental importance in polymer-grafted particles, namely, the particle relaxation time. This timescale quantifies the competition between the contributions of the solvent and grafted chains to the friction of the grafted particle and separates g(t) into the particle- and chain-dominated regimes. The monomer relaxation time and the grafted chain relaxation time further divide the chain-dominated regime of g(t) into subdiffusive and diffusive regimes. Analysis of the asymptotic behaviors of K(t) and g(t) provides a clear physical picture of the mobility of the particle in different dynamical regimes, shedding light on the complex dynamics of polymer-grafted particles.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0153473
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 2
    Online Resource
    Online Resource
    Explicit analytical form for memory kernel in the generalized Langevin equation for end-to-end vector of Rouse chains
    AIP Publishing ; 2022
    In:  The Journal of Chemical Physics Vol. 157, No. 22 ( 2022-12-14)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 157, No. 22 ( 2022-12-14)
    Abstract: The generalized Langevin equation (GLE) provides an attractive theoretical framework for investigating the dynamics of conformational fluctuations of polymeric systems. While the memory kernel is a central function in the GLE, explicit analytical forms for this function have been challenging to obtain, even for the simple models of polymer dynamics. Here, we achieve an explicit analytical expression for the memory kernel in the GLE for the end-to-end vector of Rouse chains in the overdamped limit. Our derivation takes advantage of the finding that the dynamics of the end-to-end vector of Rouse chains with both free ends are equivalent to those of Rouse chains with one free end and the other fixed. For the latter model, we first show that the equations of motion of the Rouse modes as well as their statistical properties can be obtained under the boundary conditions where the free end is held fixed temporarily. We then analytically solve the terms associated with intrachain interactions in the GLE. By formally comparing these terms with the GLE based on the Rouse modes, we obtain an explicit expression for the memory kernel, along with analytical forms for the potential field and the random colored noise force. Our analytical memory kernel is confirmed by numerical calculations in the Laplace space and is shown to yield asymptotic behaviors that are consistent with previous studies. Finally, we utilize our analytical result to simulate the cyclization dynamics of Rouse chains and discuss the scaling of the cyclization time with chain length.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/5.0124925
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 3
    Online Resource
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    Micro-particle manipulation by single beam acoustic tweezers based on hydrothermal PZT thick film
    AIP Publishing ; 2016
    In:  AIP Advances Vol. 6, No. 3 ( 2016-03-01)
    Details
    In: AIP Advances, AIP Publishing, Vol. 6, No. 3 ( 2016-03-01)
    Abstract: Single-beam acoustic tweezers (SBAT), used in laboratory-on-a-chip (LOC) device has promising implications for an individual micro-particle contactless manipulation. In this study, a freestanding hydrothermal PZT thick film with excellent piezoelectric property (d33 = 270pC/N and kt = 0.51) was employed for SBAT applications and a press-focusing technology was introduced. The obtained SBAT, acting at an operational frequency of 50MHz, a low f-number (∼0.9), demonstrated the capability to trap and manipulate a micro-particle sized 10μm in the distilled water. These results suggest that such a device has great potential as a manipulator for a wide range of biomedical and chemical science applications.
    Type of Medium: Online Resource
    ISSN: 2158-3226
    URL: Article
    URL: Article
    DOI: 10.1063/1.4943492
    DOI: 10.1063/1.4943492.1
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 2583909-3
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  • 4
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    Online Resource
    Manipulating terahertz electromagnetic induced transparency through parallel plate waveguide cavities
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 103, No. 25 ( 2013-12-16)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 103, No. 25 ( 2013-12-16)
    Abstract: To mechanically manipulate of electromagnetic induced transparency (EIT) in terahertz asymmetric parallel-plate waveguide cavities, the influence of waveguide spacing on the transmission response has been studied experimentally. After setting the appropriate shifting length between two cavities, we found with mechanically increasing the waveguide spacing, the symmetric resonance shows degeneracy when its wavelength is smaller than the waveguide spacing. An on-to-off modulation for symmetric resonance appeared in EIT can be observed with destructive interference broken. This control mechanism of EIT will open a door to design the tunable EIT devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4852115
    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
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    Online Resource
    Broad band invisibility cloak made of normal dielectric multilayer
    AIP Publishing ; 2011
    In:  Applied Physics Letters Vol. 99, No. 15 ( 2011-10-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 99, No. 15 ( 2011-10-10)
    Abstract: We present the design, fabrication, and performance test of a quasi three-dimensional carpet cloak made of normal dielectric in the microwave regime. Taking advantage of a simple linear coordinate transformation, we design a carpet cloak with homogeneous anisotropic medium and then practically realize the device with multilayer of alternating normal dielectric slabs based on the effective medium theory. As a proof-of-concept example, we fabricate the carpet cloak with multilayer of FR4 dielectric slabs with air spacing. The performance of the fabricated design is verified through full-wave numerical simulation and measurement of the far-field scattering electromagnetic waves in a microwave anechoic chamber. Experimental results have demonstrated pronounced cloaking effect in a very broad band from 8 GHz to 18 GHz (whole X and Ku band) due to the low loss, non-dispersive feature of the multilayer dielectric structure.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3648116
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2011
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
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    Strain-modulated magnetization precession in skyrmion-based spin transfer nano-oscillator
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 118, No. 14 ( 2021-04-05)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 118, No. 14 ( 2021-04-05)
    Abstract: The magnetic skyrmion-based spin transfer nano-oscillators have been set as microwave signal emitters and gaining in popularity due to their performance and integrability in the existing CMOS process flow. In this work, we report our investigations on the strain-modulated magnetization precession in the breathing mode skyrmion-based spin transfer nano-oscillator, which strains from the juxtaposed piezoelectric materials. The strain-modulated skyrmion breathing frequency can be strongly controlled by biaxial-isotropy in-plane strain, in which the tunable range varies from 500 MHz to 7 GHz under the fixed current density −4 ×1012 A/m2 and varying strain from −2000 ppm to 4000 ppm. Such tunability is external magnetic free and even does not reduce the dynamic resistance variation. Through this method, a promising digital binary frequency shift-key and amplitude shift-key modulation technique are presented, in which the magnetization precession frequency and amplitude can be tuned with the co-action of current and strain pulses. These findings are providing an optional route to design future tunable spin transfer nano-oscillators based on skyrmion with better performance in the wireless communication.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0043537
    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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  • 7
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    Online Resource
    The existence of solutions with prescribed L 2-norm for Kirchhoff type system
    AIP Publishing ; 2017
    In:  Journal of Mathematical Physics Vol. 58, No. 4 ( 2017-04-01)
    Details
    In: Journal of Mathematical Physics, AIP Publishing, Vol. 58, No. 4 ( 2017-04-01)
    Abstract: In this paper, we study the existence of positive solutions with prescribed L2-norm for two-component Kirchhoff type systems in the whole space. Under different types of potentials, we consider the L2-subcritical case and L2-critical case by the constrained variational method.
    Type of Medium: Online Resource
    ISSN: 0022-2488 , 1089-7658
    URL: Article
    DOI: 10.1063/1.4982037
    RVK:
    UA 4660
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 1472481-9
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  • 8
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    Online Resource
    Multiscaled density-functional theory for helical polymers
    AIP Publishing ; 2009
    In:  The Journal of Chemical Physics Vol. 131, No. 5 ( 2009-08-07)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 131, No. 5 ( 2009-08-07)
    Abstract: We propose a density-functional theory (DFT) for helical polymers by introducing the orientational potential of a molecule. A multiscaled finite element approach is incorporated to reduce the time consumption of the computation efficiently. The multiscaled finite element approach proposed here can be easily applied to the calculations of different versions of DFTs. The agreements of the calculated results and Monte Carlo data in studying flexible and rodlike polymers confirm that our approach does lead to correct predictions. By using the proposed theory, we explore the self-assembly of helical polymers on a hydrophobic surface. The dependences of density profiles and orientational distributions on the helical conformation and the attractive strength of the surface are also investigated. It is found that a homeotropic monolayer would be formed on the surface directly as the ratio between helical radii (R) and height (H) is less than 0.5. At the range of 0.5≤R/H & lt;1, a planar homogeneous monolayer would be first formed at low attractive strength and then transmitted to a homeotropic monolayer at high attractive strength. For the case of R/H≥1, the helical polymers only assemble into the planar homogeneous monolayer with no transition to the homeotropic monolayer. Finally, we studied the effect of the helical conformation on the self-assembly by changing the helix angle from 75° to 0°. It is found that the helical conformation makes the polymers more difficult for the self-assembly compared to the noncoiled structures.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.3197004
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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  • 9
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    Effects of the substitution of Al for Mn on structure, magnetic, and magnetocaloric properties in MnCoGe
    AIP Publishing ; 2016
    In:  Journal of Applied Physics Vol. 119, No. 21 ( 2016-06-07)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 119, No. 21 ( 2016-06-07)
    Abstract: The magnetic transition can be controlled by partial substitution of Al for Mn in Mn1−xAlxCoGe, leading to a wide transition temperature range around the room temperature. A well-defined linear relationship between the magnetic entropy change (|ΔSM|) and H2/3 demonstrates the second-order character of magnetic transition. In the case of x = 0.02, the relative cooling power of 242.3 J·kg−1 is achieved for Δμ0H = 5 T at 270.5 K. Interestingly, a corresponding monotonical decline in |ΔSM| is in relation to magnetic moment per formula unit. The observed large relative cooling power with wide phase transition temperatures makes these materials promising for room-temperature magnetic cooling applications.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4949492
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 10
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    Density functional theory for adsorption of colloids on the polymer-tethered surfaces: Effect of polymer chain architecture
    AIP Publishing ; 2009
    In:  The Journal of Chemical Physics Vol. 130, No. 16 ( 2009-04-28)
    Details
    In: The Journal of Chemical Physics, AIP Publishing, Vol. 130, No. 16 ( 2009-04-28)
    Abstract: A density functional theory is used to investigate adsorption of colloids on the surfaces grafted by polymers of different architectures, including linear, star, branched, and dendritic structures. In order to calculate the direct bonding connectivity integral, a new numerical algorithm is proposed for polymers with complex architecture. A good agreement of the calculated results and the simulation and experimental data in studying grafted hard chain brushes confirm that our approach does lead a correct prediction. Accordingly, adsorption of colloids in the negative exponential attractive surface was studied. The effects of grafting density, attractive strength, molecular concentration, and size on adsorption were considered. The contour maps of excluded rate show that a complex architecture of polymer chains is much more effective in preventing adsorption than linear polymer brush. The results also show that the grafting density and complex architecture are two key factors to prevent colloidal adsorption, while the surface attractive strength only exhibits slight effect on colloidal adsorption. For polymer brushes with complex architecture, the height of potential of mean force is strongly dependent on the colloidal size. The larger the size, the higher is the potential of mean force, which means that the larger colloidal molecules are harder to penetrate the brush. In short, to prevent colloidal adsorption, it is more suitable to use the polymer brushes with complex architecture.
    Type of Medium: Online Resource
    ISSN: 0021-9606 , 1089-7690
    URL: Article
    DOI: 10.1063/1.3119311
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2009
    detail.hit.zdb_id: 3113-6
    detail.hit.zdb_id: 1473050-9
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