Electrospray deposit structure of nanoparticle suspensions

Brown, Nicola; Zhu, Yuxuan; German, Guy K.; Yong, Xin; Chiarot, Paul R.

doi:10.1016/j.elstat.2017.09.004

Cited by 33 publications

(27 citation statements)

References 54 publications

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“…4b), suggesting that charge traveled through the glass substrate that housed the Ti/Pt electrode. Chiarot et al and Osuji et al previously demonstrated this ability to spray on glass substrates despite low electrical conductivity 12,35 . We suspect this is due to the surface conductivity of many low-melt glasses being great enough to conduct the low charge deposition rate of ESD.…”

Section: Discussionmentioning

confidence: 93%

Self-limiting electrospray deposition on polymer templates

Lei

Gamboa

Kuznetsova

et al. 2020

Sci Rep

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Electrospray deposition (ESD) applies a high voltage to liquids flowing through narrow capillaries to produce monodisperse generations of droplets down to hundreds of nanometers in diameter, each carrying a small amount of the delivered solute. This deposition method has been combined with insulated stencil masks for fabricating micropatterns by spraying solutions containing nanoparticles, polymers, or biomaterials. To optimize the fabrication process for micro-coatings, a self-limiting electrospray deposition (SLED) method has recently been developed. Here, we combine SLED with a pre-existing patterned polymer film to study SLED’s fundamental behavior in a bilayer geometry. SLED has been observed when glassy insulating materials are sprayed onto conductive substrates, where a thickness-limited film forms as charge accumulates and repels the arrival of additional charged droplets. In this study, polystyrene (PS), Parylene C, and SU-8 thin films of varying thickness on silicon are utilized as insulated spraying substrates. Polyvinylpyrrolidone (PVP), a thermoplastic polymer is sprayed below its glass transition temperature (Tg) to investigate the SLED behavior on the pre-deposited insulating films. Furthermore, to examine the effects of in-plane confinement on the spray, a microhole array patterned onto the PS thin film by laser dewetting was sprayed with dyed PVP in the SLED mode. This was then extended to an unmasked electrode array showing that masked SLED and laser dewetting could be used to target microscale regions of conventionally-patterned electronics.

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Section: Discussionmentioning

confidence: 93%

Self-limiting electrospray deposition on polymer templates

Lei

Gamboa

Kuznetsova

et al. 2020

Sci Rep

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“…Electrospray produces small monodisperse particles, in the form of a thin film of fine particles, from a colloidal suspension of solid nanoparticles or a solution of a material. An electrospray uses large electric fields to generate a spray of highly charged droplets, the emitter from which the spray originates is a small diameter capillary outlet connected to a high voltage source relative to a ground electrode positioned in front of the emitter [ 2 ]. As the electric field becomes stronger, fluid at the edge of the capillary outlet deforms into a Taylor cone jet.…”

Section: Introductionmentioning

confidence: 99%

Transport Properties of Electro-Sprayed Polytetrafluoroethylene Fibrous Layer Filled with Aerogels/Phase Change Materials

et al. 2020

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This work is the first attempt to prepare microporous polytetrafluoroethylene (PTFE) fibrous layers embedded with aerogels/phase change materials. For preparation of this layer, the needle-less electrospray technology of water dispersion of individual components is used. Microstructure characteristics, including surface morphology and particle size distribution, and various properties of the prepared materials were investigated and explained. Transport performance of the fibrous layers embedded with aerogels/phase change materials, such as the transmission of heat, air, and water vapor was evaluated and discussed in details. It was found that the electro-sprayed materials composed by spherical particles with rough surface had compact disordered stacking structure. Aerogels and phase change materials (PCMs) play different roles in determining structural parameters and transport properties of the materials. Those parameters and properties could be flexibly adjusted by optimizing the spinning parameters, changing the content or proportion of the fillers to meet specific requirements.

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“…This is particularly useful in the production of thin nanoporous films and coatings, which can be additionally structured into well-defined arrangements and geometries. The chemical composition of processed nanoparticles is determined by the target application and can include silver [75,189] (surface-enhanced Raman spectrometry), iron oxides [39] and iron [190] (recording media, sensors), carbon [191] (electrodes), titanium oxide [189,192,193] (gas sensors, photocatalysis), gold [43,194,195] (hybrid memory elements), silicon oxide [195,196], polystyrene [189,197], and many other materials. Most of these applications require the coating to have uniform properties across the entire treated surface; therefore, cone-jet mode is typically employed as it produces a fine aerosol with a narrow size distribution of droplets [43].…”

Section: Film Depositionmentioning

confidence: 99%

Electrospray: More than just an ionization source

et al. 2020

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is a potential-driven process of liquid atomization, which is employed in the field of analytical chemistry, particularly as an ionization technique for mass spectrometric analyses of biomolecules. In this review, we demonstrate the extraordinary versatility of the electrospray by overviewing the specifics and advanced applications of ESbased processing of low molecular mass compounds, biomolecules, polymers, nanoparticles, and cells. Thus, under suitable experimental conditions, ES can be used as a powerful tool for highly controlled deposition of homogeneous films or various patterns, which may sometimes even be organized into 3D structures. We also emphasize its capacity to produce composite materials including encapsulation systems and polymeric fibers. Further, we present several other, less common ES-based applications. This review provides an insight into the remarkable potential of ES, which can be very useful in the designing of innovative and unique strategies.

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Electrospray deposit structure of nanoparticle suspensions

Cited by 33 publications

References 54 publications

Self-limiting electrospray deposition on polymer templates

Self-limiting electrospray deposition on polymer templates

Transport Properties of Electro-Sprayed Polytetrafluoroethylene Fibrous Layer Filled with Aerogels/Phase Change Materials

Electrospray: More than just an ionization source

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