Impact-induced generation of single airborne microspheres and the subsequent vacuum-driven assembly of ordered arrays

Geite, Ward Van; Jimidar, Ignaas S.M.; Gardeniers, Han; Desmet, Gert

doi:10.1016/j.powtec.2022.118177

Cited by 1 publication

(3 citation statements)

References 35 publications

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“…35 In principle, overcoming the surface interaction forces between particles and substrates is the key challenge in dry assembling ultrafine powder into crystal structures. 12,19 Next, the relevant interaction forces are qualitatively presented. For a more elaborate description, the reader is kindly referred to other reports.…”

Section: Relevant Interaction Forces In Dry Assembling Colloidal Part...mentioning

confidence: 99%

“…The latter is surprising as dry assembly methods can be faster and more applicable to a larger spectrum of particle types. So far, proposed dry assembly methods include mechanical rubbing − or agitation, , while more recently, vacuum-driven assembly with the aid of electrostatic levitation or powder impact has been explored. These studies reported the use of hard (silicon) or soft (polydimethylsiloxane (PDMS)) physically templated surfaces, i.e., surfaces covered with periodic holes or wells to attain ordered, nonclosely packed particle arrays.…”

Section: Introductionmentioning

confidence: 99%

“…However, the Jeong group’s work has been limited to utilize particles between two PDMS sheets (both rubbing stamp and substrate) and other types of similar rubbery substrates. This limits the versatility of applications in, e.g., analytical science screening ,, where PDMS can react with solvents, decreasing the sensitivity of assays and subsequent manipulation or printing due to the stickiness of PDMS.…”

Section: Introductionmentioning

confidence: 99%

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Toward the Assembly of 2D Tunable Crystal Patterns of Spherical Colloids on a Wafer-Scale

Sotthewes,

Roozendaal,

Šutka

et al. 2024

ACS Appl. Mater. Interfaces

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Entering an era of miniaturization prompted scientists to explore strategies to assemble colloidal crystals for numerous applications, including photonics. However, wet methods are intrinsically less versatile than dry methods, whereas the manual rubbing method of dry powders has been demonstrated only on sticky elastomeric layers, hindering particle transfer in printing applications and applicability in analytical screening. To address this clear impetus of broad applicability, we explore here the assembly on nonelastomeric, rigid substrates by utilizing the manual rubbing method to rapidly (≈20 s) attain monolayers comprising hexagonal closely packed (HCP) crystals of monodisperse dry powder spherical particles with a diameter ranging from 500 nm to 10 μm using a PDMS stamp. Our findings elucidate that the tribocharging-induced electrostatic attraction, particularly on relatively stiff substrates, and contact mechanics force between particles and substrates are critical contributors to attain large-scale HCP structures on conductive and insulating substrates. The best performance was obtained with polystyrene and PMMA powder, while silica was assembled only in HCP structures on fluorocarbon-coated substrates under zero-humidity conditions. Finally, we successfully demonstrated the assembly of tunable crystal patterns on a wafer-scale with great control on fluorocarbon-coated wafers, which is promising in microelectronics, bead-based assays, sensing, and anticounterfeiting applications.

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Section: Relevant Interaction Forces In Dry Assembling Colloidal Part...mentioning

confidence: 99%