A method is presented for the preparation of a biocompatible ferrofluid containing dye-functionalized magnetite nanoparticles that can serve as fluorescent markers. This entails surface functionalization using citric acid to produce stable aqueous dispersion and subsequent binding dyes particles. Several samples were prepared characterized Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron (XPS), thermogravimetric analysis (TGA), BET area analysis, transmission electron...

An analytical model is presented for predicting the transport and capture of therapeutic magnetic nanoparticles in human microvasculature. The nanoparticles, with surface bound drug molecules, are injected into vascular system upstream from malignant tissue, captured at tumor site using a local applied field. field produced by rare-earth cylindrical magnet positioned outside body. expression derived trajectory particle as it flows through microvasculature proximity to magnet. In addition,...

An analytical analysis is presented of the transport and capture magnetic micro/nano-particles in a magnetophoretic microsystem that consists an array integrated soft-magnetic elements embedded beneath microfluidic channel. The elements, which are polarized by bias field, produce nonuniform field distribution gives rise to force on particles within microchannel. equations governing particle motion derived using expressions for dominant fluidic forces. obtained expression microchannel...

We present a method and model for the direct continuous separation of red white blood cells in plasma. The is implemented at microscale using microfluidic system that consists an array integrated soft-magnetic elements embedded adjacent to channel. microsystem passive activated via application bias field magnetizes elements. Once magnetized, produce nonuniform magnetic distribution microchannel, which gives rise force on as they pass through microsystem. In whole blood, behave diamagnetic...

This article presents a new method for fabricating highly conductive gold nanostructures within polymeric matrix with subwavelength resolution. The are directly written in precursor-doped photoresist using femtosecond pulsed laser. laser energy is absorbed by two-photon dye, which induces simultaneous reduction of the precursor and polymerization negative photoresist. results nanoparticle-doped lines that exhibit both plasmonic effects, due to constituent nanoparticles, relatively high...

Abstract Industrial membranes comprised of a thin selective layer (<100 nm) requires gutter between the and porous support to achieve high permeance for gas separation. The materials must be carefully chosen enhance overall membrane performance, i.e. , selectivity. However, experimental determination optimum properties is very challenging. Herein we address this need using three dimensional (3D) computational model systematically determine effects thickness permeability on performance. A...

Abstract Magnetic levitation has been used to implement low-cost and maintenance-free electromagnetic energy harvesting. The ability of levitation-based harvesting systems operate autonomously for long periods time makes them well-suited self-powering a broad range technologies. In this paper, combined theoretical experimental study is presented harvester configuration that utilizes the motion levitated hard-magnetic element generate electrical power. A semi-analytical, non-linear model...

Fe3O4 nanoparticles in the size range of 8−12 nm have been prepared and allowed to self-assemble on GaAs substrates presence strong magnetic fields. A long ordering is observed which particles into a distribution elongated clusters with predominant orientation lengthwise along field direction. Hysteresis loops measured parallel perpendicular alignment direction show substantial directional dependence. The coercive fields are larger than those it by 57% 136% at 100 5K, respectively. broad...

Magnetic particles are finding increasing use in bioapplications, especially as carrier to transport biomaterials such proteins, enzymes, nucleic acids and whole cells etc. can be prepared with biofunctional coatings target label a specific biomaterial, they enable controlled manipulation of labeled biomaterial using an external magnetic field. In this review, we discuss the nanoparticles agents various bioapplications. We provide overview properties their functionalization for basic physics...

Preparation of nanomaterials with controllable sizes and shapes at ambient conditions, without heating or cooling, is extremely attractive from the perspective cost energy efficiency. However, highly reactive precursors must be used to obtain NCs this can make control particle formation challenging. Degenerately p-doped copper sulfide have attracted much recent interest based on observation localized surface plasmon resonance (LSPR) in these materials. These earth-abundant semiconductor...

A formula is presented for computing the coupling between magnetic gears. This formula, which based on two-dimensional analytical analysis, expressed as a finite sum of elementary functions and well suited parametric analysis. It demonstrated via application to practical device verified using element analysis (FEA).

A model is presented for predicting the magnetic field, and fluidic forces on micro/nano-particles in a magnetophoretic microsystem. The microsystem consists of linear array soft-magnetic elements embedded beneath microfluidic channel. are magnetized using an external bias produce nonuniform field distribution that permeates microchannel. This gives rise to force particles as they flow through Analytical expressions derived within microchannel, particles. magnetization used predict response...

A novel method for fabricating metallic nanostructures with sub-wavelength resolution in a polymer using simultaneous two-photon initiated reduction of metal salt and polymerization negative photoresist is demonstrated. Gold nanoparticle-doped lines as narrow 200 nm were fabricated. The dependence line-width on laser intensity scan speed are captured well by an analytical model. We created functional gratings planar chiral elements, characterized their optical properties, modeled...

We present a model for predicting the transport of biofunctional magnetic nanoparticles in passive magnetophoretic system that consists fluidic chamber positioned above rare-earth magnet. The is based on drift-diffusion equation governs particle concentration chamber. solve this numerically using finite volume method. apply to magnetofection process wherein force produced by magnet attracts carrier particles with surface-bound gene vectors toward bottom transfection target cells. study and...

A study is presented of photothermal effects associated with nanosecond-pulsed laser-illuminated subwavelength metallic nanoparticles in aqueous solutions. Computational electromagnetic and fluid analysis are used to model fundamental aspects the process taking into account energy conversion within nanoparticle at plasmon resonance, heat transfer fluid, homogeneous bubble nucleation, dynamic behaviour surrounding fluid. Various geometries modelled including spheres, nanorods tori. The...

A three-dimensional field solution is presented for radially polarized permanent-magnet cylinders. The derived formulae are evaluated in terms of finite sums elementary functions. They readily programmed and ideal performing rapid parametric studies the distribution outside cylinders made from rare earth materials such as NdFeB. theory demonstrated with some sample calculations that verified by use element analysis.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...