Numerical modeling of the splitting of magnetic droplets by multiphase lattice Boltzmann equation

A multiphase lattice Boltzmann numerical model driven by an isothermal interaction potential is applied for the splitting of magnetic droplets in elctrowetting-on-dielectric devices. A hydrophilic magnetic plug is considered inside the liquid droplet and successive uniform force fields are applied in order to split this droplet. The numerical results are compared with experiments on water droplets containing plugs of superparamagnetic beads and good agreement is obtained.Un mod\ue8le num\ue9rique de type Boltzmann pour les r\ue9seaux multiphasiques dict\ue9 par un potentiel d\u2019interaction isotherme est appliqu\ue9 \ue0 la s\ue9paration de gouttelettes magn\ue9tiques dans des dispositifs d\u2019\ue9lectromouillage sur di\ue9lectrique. On consid\ue8re un bouchon magn\ue9tique hydrophile \ue0 l\u2019int\ue9rieur de la gouttelette et on applique des champs de force uniformes successifs afin de s\ue9parer cette gouttelette. Les r\ue9sultats des calculs sont compar\ue9s \ue0 ceux d\u2019exp\ue9riences sur des gouttelettes d\u2019eau contenant des bouchons de billes superparamagn\ue9tiques, ils sont en bon accord.Peer reviewed: YesNRC publication: Ye

Zinātniskā komunisma jautājumi

CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOIn order to understand the magnetocaloric response of materials, it is important to analyze the interactions between the different phases present in them. Recent models have analyzed the influence of these interactions on the magnetocaloric response of composites, providing an estimate value of the interaction field that is consistent with experimental results. This paper analyzes to which extent magnetization first-order reversal curve (FORC) method can be used to calculate these interactions. It is shown that the different field ranges that are explored using these techniques (inside the hysteretic region for FORC; close to magnetic saturation for magnetocaloric effect) produce interaction field values that differ in order of magnitude, with FORC being sensitive to the lower values of the interaction field and magnetocaloric analysis accounting for the larger interactions. (C) 2015 AIP Publishing LLC.In order to understand the magnetocaloric response of materials, it is important to analyze the interactions between the different phases present in them. Recent models have analyzed the influence of these interactions on the magnetocaloric response of composites, providing an estimate value of the interaction field that is consistent with experimental results. This paper analyzes to which extent magnetization first-order reversal curve (FORC) method can be used to calculate these interactions. It is shown that the different field ranges that are explored using these techniques (inside the hysteretic region for FORCclose to magnetic saturation for magnetocaloric effect) produce interaction field values that differ in order of magnitude, with FORC being sensitive to the lower values of the interaction field and magnetocaloric analysis accounting for the larger interactions.1171714CNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICOCNPQ - CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO401921/2013-1This work was supported by the Science Without Borders Program of the Brazilian funding agency CNPq (#401921/2013‐1), the Spanish MINECO and EU FEDER (Project No. MAT 2013-45165-P) and the PAI of the Regional Government of Andalucía (Project No. P10-FQM-6462)

The interaction field in arrays of ferromagnetic barcode nanowires

[[sponsorship]]應用科學研究中心[[note]]已出版;[SCI];有審查制度;具代表性[[note]]http://gateway.isiknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=Drexel&SrcApp=hagerty_opac&KeyRecord=0957-4484&DestApp=JCR&RQ=IF_CAT_BOXPLO

Numerical micromagnetics of interacting superparamagnetic nanoparticles assembled in clusters with different dimensionalities

We analyze here the equilibrium magnetization state of densely packed interacting superparamagnetic nanoparticles assembled in clusters of various sizes and dimensionalities by comparison with the non-interacting case. We demonstrate that the average magnetization of individual particles is strongly increased in linear chains aligned parallel with the external magnetic field. Twodimensional (2D) distributions of superparamagnetic nanoparticles present weaker increases of their average magnetization with respect to the non-interacting approximation whereas volume distributions (3D) are almost equivalent with the non-interacting case. A large number of nanoparticles densely packed in 2D superparamagnetic clusters present almost the same magnetic moment as infinite superparamagnetic chains. The effect of mutual interactions on the total magnetic moment of 3D surfaces (spheroids with various aspect ratios) uniformly covered with densely packed monolayers of superparamagnetic nanoparticles is also investigated.Peer reviewed: YesNRC publication: Ye

All-thermoplastic nanoplasmonic microfluidic device for transmission SPR biosensing

Early and accurate disease diagnosis still remains a major challenge in clinical settings. Biomarkers could potentially provide useful tools for the detection and monitoring of disease progression, treatment safety and efficacy. Recent years have witnessed prodigious advancement in biosensor development with research directed towards rapid, real-time, label-free and sensitive biomarker detection. Among emerging techniques, nanoplasmonic biosensors pose tremendous potential to accelerate clinical diagnosis with real-time multiplexed analysis, rapid and miniaturized assays, low sample consumption and high sensitivity. In order to translate these technologies from the proof-of-principle concept level to point of care clinical diagnosis, integrated, portable devices having small footprint cartridges that house low-cost disposable consumables are sought. Towards this goal, we developed an all-polymeric nanoplasmonic microfluidic (NMF) transmission surface plasmon resonance (SPR) biosensor. The device was fabricated in thermoplastics using a simple, single step and cost-effective hot embossing technique amenable to mass production. The novel 3D hierarchical mold fabrication process enabled monolithic integration of blazed nanogratings within the detection chambers of a multichannel microfluidic system. Consequently, a single hard thermoplastic bottom substrate comprising plasmonic and fluidic features allowed integration of active fluidic elements, such as pneumatic valves, in the top soft thermoplastic cover, increasing device functionality. A simple and compact transmission-based optical setup was employed with multiplexed end-point or dual-channel kinetic detection capability which did not require stringent angular accuracy. The sensitivity, specificity and reproducibility of the transmission SPR biosensor was demonstrated through label-free immunodetection of soluble cell-surface glycoprotein sCD44 at clinically relevant picomolar to nanomolar concentrations. This journal is \ua9 2013 The Royal Society of Chemistry.Peer reviewed: YesNRC publication: Ye