ORCID Profile
0000-0003-0350-598X
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Publisher: Elsevier BV
Date: 09-2020
Publisher: American Chemical Society (ACS)
Date: 23-12-2019
DOI: 10.26434/CHEMRXIV.11418201.V1
Abstract: In this work, we report molecular layer deposition (MLD) of ultrathin poly(ethylene terephthalate) (PET) films on gram-scale batches of ultrafine particles for the first time. TiO 2 P25 nanoparticles (NPs) are coated up to 50 cycles in an atmospheric-pressure fluidized bed reactor at 150 °C using terephthaloyl chloride and ethylene glycol as precursors. Ex-situ diffuse reflectance infrared Fourier transform spectroscopy, thermogravimetric analysis and transmission electron microscopy show the linear growth at 0.05 nm/cycle of uniform and conformal PET films, which are unattainable with conventional wet-phase approaches. The subnano and nano PET films not only suppress the photocatalytic activity of TiO 2 NPs by reducing the generation of hydroxyl radicals, but also improve the dispersibility of TiO 2 NPs in both organic and aqueous media. Still, the bulk optical properties, electronic structure and surface area of TiO 2 are essentially unaffected by the MLD process. This study demonstrates the industrial relevance of MLD to simultaneously tune the photoactivity and dispersibility of the commercial photocatalyst TiO 2 P25. Moreover, by rapidly modifying the surface properties of particles in a controlled manner at the subnanometer scale, particle MLD can serve many applications ranging from nanofluids to emulsions to polymer nanocomposites.
Publisher: Wiley
Date: 23-12-2021
Abstract: Microswimmers are small particles capable of converting available energy sources into propulsion owing to their compositional asymmetry, and are promising for applications ranging from targeted delivery to enhanced mixing at the microscale. However, current fabrication techniques demonstrate limited scalability and/or rely on the excessive use of expensive precursor materials. Here, a scalable Pickering‐wax emulsion technique is combined with galvanic electrochemistry, to grow platinum films from copper nanoparticles asymmetrically seeded onto SiO 2 microparticle supports. In this manner, large quantities of Pt‐SiO 2 Janus microswimmers are obtained. Utilizing copper as a templating material not only has the potential to reduce synthesis time, material costs, and toxic waste, but also facilitates the further extension of this methodology to a range of functional materials. This electrochemical approach builds upon previous attempts to overcome the current limitations in microswimmer synthesis and offers exciting opportunities for their future development.
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3SM00076A
Abstract: Tracking the three-dimensional rotation of colloidal particles can help to answer many open questions, e.g. concerning the contact interactions between particles under flow, or the way in which obstacles and neighboring particles affect self-propulsion in active suspensions.
Publisher: American Chemical Society (ACS)
Date: 26-04-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2SM00930G
Abstract: ML models can identify underlying structures in large datasets. Here, we use ML models to robustly predict the 3D trajectories of microswimmers from defocused 2D microscopy images, and find that ensemble Decision Tree models perform the best.
Publisher: American Chemical Society (ACS)
Date: 05-06-2020
Publisher: American Chemical Society (ACS)
Date: 03-09-2021
DOI: 10.26434/CHEMRXIV-2021-4FMMN
Abstract: Microswimmers are small particles capable of converting available energy sources into propulsion owing to their compositional asymmetry and are promising for applications ranging from targeted delivery to enhanced mixing at the microscale. However, current fabrication techniques demonstrate limited scalability and/or rely on the excessive use of expensive precursor materials. Here, a scalable Pickering-wax emulsion technique is combined with galvanic electrochemistry, to grow platinum films from copper nanoparticles asymmetrically seeded onto SiO\\textsubscript{2} microparticle supports. In this manner, large quantities of Pt-SiO\\textsubscript{2} Janus microswimmers are obtained. Utilising copper as a templating material not only reduces synthesis time, material costs, and toxic waste, but also facilitates the further extension of this methodology to a range of functional materials. This electrochemical approach builds upon previous attempts to overcome the current limitations in microswimmer synthesis and offers exciting opportunities for their future development.
Publisher: American Chemical Society (ACS)
Date: 17-08-2022
DOI: 10.26434/CHEMRXIV-2022-1JS1H
Abstract: Nanoparticles are key to a range of applications, due to the properties that emerge as a result of their small size. However, their size also presents challenges to their processing and use, especially in relation to their immobilization on solid supports without losing their favourable functionalities. Here, we present a multifunctional polymer-bridge-based approach to attach a range of pre-synthesised nanoparticles onto microparticle supports. We demonstrate the attachment of mixtures of different types of metal-oxide nanoparticles, as well as metal-oxide nanoparticles modified with standard wet chemistry approaches. We then show that our method can also create composite films of metal and metal-oxide nanoparticles by exploiting different chemistries simultaneously. We finally apply our approach to the synthesis of designer microswimmers with decoupled mechanisms of steering (magnetic) and propulsion (light) via asymmetric nanoparticle binding, aka Toposelective Nanoparticle Attachment. We envision that the ability to freely mix available nanoparticles to produce composite films will help bridge the fields of catalysis, nanochemistry, and active matter towards new materials and applications.
Publisher: Wiley
Date: 06-11-2021
Abstract: Microswimmers hold promise for applications ranging from targeted delivery to enhanced mixing at the microscale. However, current fabrication techniques suffer from limited throughput and material selection. Here, a versatile route enabling the synthesis of microswimmers from off‐the‐shelf micro‐ and nano‐particles is demonstrated. The protocol hinges on the toposelective attachment of photocatalytic nanoparticles onto microparticles, exploiting a multi‐functional polymer and a Pickering‐wax emulsification step, to yield large quantities of photo‐responsive active Janus particles. The polymer presents both silane and nitrocatechol groups, binding silica microspheres to a range of metal oxide nanoparticles. The Pickering‐wax emulsions protect part of the microspheres’ surface, enabling asymmetric functionalization, as required for self‐propulsion. The resulting photocatalytic microswimmers display a characteristic orientation‐dependent 3D active motion upon ultra‐violet illumination, different from that conventionally described in the literature. By connecting the extensive library of heterogeneous nanoparticle photocatalysts with the nascent field of active matter, this versatile material platform lays the groundwork toward designer microswimmers, which can swim by catalyzing a broad range of chemical reactions with potential for future applications.
Publisher: Elsevier BV
Date: 03-2021
Publisher: American Physical Society (APS)
Date: 22-11-2022
No related grants have been discovered for Maximilian Bailey.