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WG1: Electrical effects including electrosprays and electric discharges
Time:
Thursday, 04/Sept/2025:
10:15am - 11:15am
Session Chair: Barbara D'Anna Session Chair: Joan Rosell-Llompart
Location: Room Raffaello
Presentations
10:15am - 10:30am TH1-4: 1
Bipolar Electrospray for Stable TiO2/Ag Heteroaggregate Synthesis: Enhanced Process Stability and Photocatalytic Characterization through Advanced Submicron Imaging
Philipp Rembe1 , Jean-Pascal Borra 2 , Alfred P. Weber1
1 Clausthal University of Technology, Germany; 2 Université Paris Saclay, France
This study presents a novel approach using bipolar electrospray for synthesizing TiO₂/Ag heteroaggregates, ensuring stable and efficient nanostructure formation. The method leverages electrohydrodynamic atomization to generate charged droplets, allowing precise control over particle formation. A detailed investigation into process stability includes current-voltage (I/V) analyses, optimizing parameters such as voltage, flow rate, and solution properties. Additionally, an advanced microscopy system is introduced to capture high-resolution images of droplet interactions, providing insights into coagulation mechanisms. This research highlights the potential of bipolar electrospray and advanced imaging for optimizing nanomaterial synthesis, particularly for photocatalytic applications.
10:30am - 10:45am TH1-4: 2
Design of electrostatic-assisted, high-throughput atomizers based on Flow Blurring
Luis Modesto-López 1 , Alfonso Gañán-Calvo1,2
1 Department of Aerospace Engineering and Fluid Mechanics, Universidad de Sevilla, Spain; 2 Laboratory of Engineering for Energy and Environmental Sustainability, Universidad de Sevilla, Spain
The fragmentation of liquid jets by a gas stream plays a critical role in advanced materials production due to its high efficiency. Pneumatic techniques, such as Flow Blurring (FB), promote droplet formation by inducing microscale mixing. This approach has been successfully adapted for viscous liquids, enabling the generation of droplets, micro- and nanoparticles, and fibrous materials. Recent advancements combine FB atomization with electric charging, facilitating the synthesis of polymer fibers embedded with nanomaterials like carbon nanotubes and graphene oxide. Current research efforts focus on developing an FB device with integrated high-voltage electrodes to enhance atomization efficiency and optimize material collection.
10:45am - 11:00am TH1-4: 3
A model of ion field emission from electrospray nanodroplets
Ignacio G Loscertales 1 , Francisco Higuera2
1 Universidad de Málaga, Spain; 2 Universidad Politécnica de Madrid, Spain
We introduce a model of the field emission of small ions from a cloud of evaporating electrospray nanodroplets of a salty solution.
11:00am - 11:15am TH1-4: 4
Charge neutralization and electrospray control in a soft mist inhaler
Kelly Schneider Moreira 1 , Fatemeh Jahanmard2 , Mehmet Üzümcü2 , Hans Kersbergen2 , Maurits Huigen2 , Erik van de Heide2 , Scott Fleming2 , Luewton Lemos F Agostinho1
1 NHL Stenden University of Applied Science, Netherlands, The; 2 Gilbert Innovation b.v., Eindhoven, 5656 AE, Netherlands
Effective inhalation therapy requires precise aerosol size and distribution for targeted lung delivery. Electrospray (EHDA) generates uniform micro- and nanodroplets, improving drug delivery. Gilbert b.v. is developing an EHDA-based inhaler for complex lung conditions. This study investigates droplet neutralization and electrospray control in a soft mist inhaler using a multi-nozzle system and corona discharge. A stable cone-jet region was mapped, and optimal neutralization voltage was identified for ethanol-based solutions. Future research will focus on spray stability with reduced ethanol content and its impact on droplet size and drug delivery efficiency.
