Mechanical stability measurements of surface modified nanoparticle agglomerates

Post, Patrick; Bierwirth, Malte; Weber, Alfred P.

doi:10.1016/j.jaerosci.2018.08.007

Cited by 10 publications

(5 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[94] Although CC can cause agglomeration and aggregate restructuring processes with both gas [95,96] and liquid [97] carrier fluids, methods based on capillary condensation have been successfully used to increase the mechanical stability of fragile structures against mechanical impacts or capillary forces from other liquids. [51,98] Within the resolution limits of the chosen analysis methods, CC is also applicable with nanopillars standing on glue, [31] porous carbon spheres, [71,99] and loose particle aggregates or their beds without losing their packing-dependent functionalities. [15,51,100,101] Therefore, capillary condensation should not be presumed to always cause relevant structural damage.…”

Section: Managing Capillary Forcesmentioning

confidence: 99%

“…In their later work, the authors considered this coating to be incomplete and speculated that the uneven coating would be due to "capillary forces acting on liquid coating intermediates." [98] A process with 1,3,5-trivinyl-1,1,3,5,5-pentamethyltrisiloxane (TVTSO) and tBPO was applied on polystyrene particles and silicon trenches. [143] Despite the continuous initiation applied in the study, the process showed strong trench-filling tendencies and a planarizing effect specifically at low initiation powers, which allowed the reagent to equilibrate with the surface structures.…”

Section: Processes: Initiation Reagents and Substratesmentioning

confidence: 99%

“…On the other hand, the condensation probably proceeded through silanol‐like reaction intermediates, and a possibility of film flow should not be excluded. In their later work, the authors considered this coating to be incomplete and speculated that the uneven coating would be due to “capillary forces acting on liquid coating intermediates.” [ 98 ]…”

Section: Processes: Initiation Reagents and Substratesmentioning

confidence: 99%

See 2 more Smart Citations

Condensation‐Controlled Toposelective Vapor Deposition in Nano‐ and Microcavities: Theory, Methods, Applications, and Related Technologies

Lovikka¹

2022

Adv Materials Inter

View full text Add to dashboard Cite

fabricable while we are facing increasing complexity in, for example, microelectronics. [6,7] For these reasons, challenges such as bad pattern alignment, [8,9] or pinch-off of pores and void formation [10][11][12][13] in top-down fabrication need to be addressed. On the other hand, a continuous film causes tradeoffs in desirable properties in many nanotechnological applications, such as losing mesoporosity while increasing the mechanical properties of an aerogel [14] or reducing catalytic activity while increasing catalyst stability against sintering. [15] To counter these problems, even atomic layer deposition (ALD), a method known for its superior conformality, has been expanded into area-selective fabrication by the addition of etching and functionalization steps in the workflow. [16][17][18][19] However, additional steps make the workflow increasingly slow, complex, and dependent on surface chemistries. There is also a growing interest in area-selectivity based on properties of precursors and substrates in ALD, [20] but new requirements on precursors would narrow down potential reagents. Furthermore, even conformal methods would leave voids inside ink-bottle-shaped pores and under composite undercuts [21] because conformal methods would clog the pore mouths before filling the internal parts. These problems have very recently revoked calls for profound changes and even a paradigm shift toward selective functionalization in the nanoscale. [18,20,[22][23][24][25] Special attention should be paid to inherently non-conformal methods, especially if they are surface-selective towards cavities. This includes both surface-selective subconformal coatings, those that coat only extremities and protrusions of a substrate, and surface-selective superconformal coatings, those that fill or coat cavities.Bottom-up approaches could eliminate the aforementioned problems while reducing the needed steps for surface-selective treatments-instead of breaking or carving things smaller and using miniaturized techniques (top-down), coatings could be grown self-aligning (bottom-up). One bottom-up category is surface-shape-selective deposition. Currently, this category has limited approaches, which are often based on either anisotropic processes such as directional plasma etching [26] or reagent flux, force fields, [27] competitive adsorption, [28] or reagents and additives with specific properties. [22] Truly bottom-up gap-filling technologies, especially those free of line-of-sight limitations, Nanotechnology drives technological progress in many frontiers, from electronics to medicine, from tougher composites to adaptive surfaces. As the feature sizes are made smaller, the importance of surfaces is increased. Many of the most powerful methods for surface manipulation are variants of vapor deposition (VD). However, VD is typically not surface-selective and, therefore, extra work steps are needed to integrate the methods into nanofabrication routines. Furthermore, many fields are moving toward 3D nanostructures, which unavoidably means...

show abstract

Section: Managing Capillary Forcesmentioning

confidence: 99%

Section: Processes: Initiation Reagents and Substratesmentioning

confidence: 99%

Section: Processes: Initiation Reagents and Substratesmentioning

confidence: 99%

See 1 more Smart Citation

Condensation‐Controlled Toposelective Vapor Deposition in Nano‐ and Microcavities: Theory, Methods, Applications, and Related Technologies

Lovikka¹

2022

Adv Materials Inter

View full text Add to dashboard Cite

show abstract

“…Nevertheless, Cu nanoparticles with high surface energy easily agglomerate into large particles, which may result in impairment of their antimicrobial efficiency for air disinfection . These issues can be addressed by integrating copper nanoparticles into aerogels with a three-dimensional (3D) macroporous structure through the gelation of graphene dispersions. , A large surface area, high porosity, well-dispersed copper nanoparticles, and excellent photothermal properties make Cu/rGO aerosols not only good candidates for air filtration but also promising heterogeneous photothermalcatalysts for air microbial oxidation.…”

Section: Introductionmentioning

confidence: 99%

Coupling Facet Cu(111)/(100)-Functionalized Graphene Aerogels for a Remarkable Air Disinfection Filter: Extracellular Electron Transfer and the Sharp-Edge Membrane Penetration Effect

Zhao

et al. 2022

ACS EST Eng.

View full text Add to dashboard Cite

As a rising antibacterial material, three different facet-engineered Cu immobilized on a mesoporous rGO(Cu/rGO) aerogel are applied as a filter for air disinfection. Interestingly, the as-synthesized Cu(100/111) nanowire/rGO aerogel (Cu NWs/rGO) exhibits superior activity in air disinfection than Cu(100) nanosphere/rGO and Cu(111) nanoplate/rGO. The experimental characterization and theoretical calculations all confirm that the sharp edges of Cu NWs in Cu/rGO and the light-induced photothermal effect can collectively result in the permeability of the cellular membrane, while Cu NWs/rGO with more defective sites, enhanced electromagnetic field strength, excellent electronic structure, and photothermal ability is beneficial to the generation of reactive oxygen species (ROS) ( • OH, • O 2 − , and 1 O 2 ). Synergism between the "physical" and "chemical" effects can enhance the destruction of cell membranes and then accelerate ROS penetration, thus enhancing bacterial inactivation. Moreover, linear sweep voltammetry (LSV) and time-dependent Kelvin probe force microscopy (KPFM) verify that extracellular electron transfer (EET) between bacteria and Cu/ rGO can also accelerate bacterial inactivation by disrupting the bacterial redox equilibrium. Finally, a comprehensive inactivation pathway was proposed and verified. This work sheds new light on designing antibacterial materials and building the bactericidal mechanism for air purification.

show abstract

“…Therefore, it is widely used in material processing and synthesis [2], energy conversion [3], environmental governance [4], plasma medicine [5], agricultural food [6], seawater desalination and other fields [7,8]. The parallel plate dielectric barrier reactor comprises parallel metal electrodes and dielectric, which is suitable for food sterilization and material surface modification [9,10]. In industrial applications, energy efficiency is a key issue.…”

Section: Introductionmentioning

confidence: 99%

Research on the characteristics of atmospheric air dielectric barrier discharge under different square wave pulse polarities

Jiang

Huang

et al. 2021

Plasma Sci. Technol.

View full text Add to dashboard Cite

Energy efficiency limits the application of atmospheric pressure dielectric barrier discharge (DBD), such as air purification, water treatment and material surface modification. This article focuses on the electrical and optical effects of the DBD under three square wave pulses polarities-positive, negative and bipolar. The result shows that under the same voltage with the quartz glass medium, the discharge efficiency of bipolar polarity pulse is the highest due to the influence of deposited charge. With the increase of air gap distance from 0.5 to 1.5 mm, average power consumed by the discharge air gap and discharge efficiency decrease obviously under alumina, and increase, and then decrease under quartz glass and polymethyl methacrylate (PMMA). Through spectrum diagnosis, in the quartz glass medium, the vibration temperature is the highest under negative polarity pulse excitation. Under bipolar pulse, the vibration temperature does not change significantly with the change of air gap distance. For the three dielectric materials of quartz glass, alumina and PMMA, the molecular vibration temperature is the highest under the quartz glass medium with the same voltage. When the gap spacing, pulse polarity or dielectric material are changed, the rotational temperature does not change significantly.

show abstract

Mechanical stability measurements of surface modified nanoparticle agglomerates

Cited by 10 publications

References 30 publications

Condensation‐Controlled Toposelective Vapor Deposition in Nano‐ and Microcavities: Theory, Methods, Applications, and Related Technologies

Condensation‐Controlled Toposelective Vapor Deposition in Nano‐ and Microcavities: Theory, Methods, Applications, and Related Technologies

Coupling Facet Cu(111)/(100)-Functionalized Graphene Aerogels for a Remarkable Air Disinfection Filter: Extracellular Electron Transfer and the Sharp-Edge Membrane Penetration Effect

Research on the characteristics of atmospheric air dielectric barrier discharge under different square wave pulse polarities

Contact Info

Product

Resources

About