Reconfigurable Positioning of Vertically-Oriented Nanowires Around Topographical Features in an AC Electric Field

Boehm, Sarah J.; Liu, Lin; Brljak, Nermina; Famularo, Nicole R.; Mayer, Theresa S.; Keating, Christine D.

doi:10.1021/acs.langmuir.7b02163

Cited by 6 publications

(9 citation statements)

References 85 publications

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“…For the scattering layer, we chose silica-coated solid gold (SiO 2 -coated Au) nanowires (300 nm diameter, 4.5 μm long) suspended in water (Figure ). These particles are highly polarizable and exhibit a strong response to the applied field, and thus are readily oriented along field lines, collected at regions of high field gradient, and/or assembled into chains. ,, Coating them in SiO 2 increases electrostatic repulsion and prevents unwanted agglomeration through van der Waals attraction and/or electrical contact. , We first studied the assembly behavior of an aqueous suspension of SiO 2 -coated Au wires (ca. 1 × 10 9 nanowires/mL) in 500 μm thick assembly cells between indium tin oxide (ITO) electrodes.…”

Section: Resultsmentioning

confidence: 99%

“…These particles are highly polarizable and exhibit a strong response to the applied field, and thus are readily oriented along field lines, collected at regions of high field gradient, and/or assembled into chains. 31,34,35 Coating them in SiO 2 increases electrostatic repulsion and prevents unwanted agglomeration through van der Waals attraction and/ or electrical contact. 35,36 We first studied the assembly behavior of an aqueous suspension of SiO 2 -coated Au wires (ca.…”

Section: Resultsmentioning

confidence: 99%

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Particle-Based Reconfigurable Scattering Masks for Lensless Imaging

et al. 2020

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Light scattering is typically undesired in optical systems as it often introduces defects or otherwise negatively impacts device performance. However, rather than being a hindrance, scattering can also be exploited to achieve lensless imaging using a scattering mask instead of lenses to enable devices with low-cost, compact construction, and yet a large field of view. Lensless imaging can benefit greatly from the ability to dynamically tune the scattering pattern produced by the mask; however, this often results in increased complexity and cost. Herein, we propose and demonstrate particle-based reconfigurable scattering masks to dynamically tune light scattering for lensless imaging, enabling multishot image reconstruction. Disordered particle populations are tuned by rational application of electric fields without requiring bulky or expensive components. Several assembly motifs are explored and studied for optimal performance; in particular, gold nanowires chained between planar electrodes yield the best reconstruction quality and are the main focus in this study. The distinct gold nanowire based scattering masks achieve a complex wavelet structural similarity as low as 0.36. By leveraging the submicrometer thickness of particles and the resultant large optical memory effect, an angular field of view of ±45° is demonstrated. The reconfigurable nature of the particle arrays enables multishot reconstruction which results in enhanced image quality and improved signal-to-noise ratios by up to 10-fold. These results suggest that reconfigurable particle masks could be a broadly applicable means of achieving dynamically tunable light scattering with potential applications in lensless microscopy or high-resolution imaging.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Particle-Based Reconfigurable Scattering Masks for Lensless Imaging

et al. 2020

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“…Considering the low density of particles in this work (2090 particles in the simulation box, with a volume fraction of φ ≈ 0.0063), ε eff can be simplified to ε eff = 3 εm f CM (ω) . The potential energy for ID–ID interactions between two particles P i and P j is given by ,, u I D − I D P i − P j ( l , θ i j ) = μ i → · μ j → ( 1 − 3 cos 2 ⁡ θ i j ) 4 π ε 0 ε m l 3 where l is the center-to-center distance between P i and P j and θ ij is the angle between the vector r⃗ ij and the direction of the electric field E⃗ . The maximum interactions are observed for θ ij = 0 or 180°, when the two vectors are parallel.…”

Section: Theoretical Methodsmentioning

confidence: 99%

Effect of Particle Composition on Dielectrophoretic Co-Assemblies around Topographic Features: Experiment and Theory

Hendrickson-Stives,

Jahanmahin,

Fichthorn

et al. 2024

J. Phys. Chem. C

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Dielectrophoresis is a powerful method for colloidal particle assembly that is particularly suited to forming structures that can be reconfigured via changes in field conditions. Realization of functional assemblies for optical applications requires consideration of particle material properties that determine both the optical response and particles' dielectrophoretic behavior. Few studies have directly compared dielectrophoretic assembly of different materials or investigated assemblies having binary mixtures of different particle compositions. Here, we investigate the assembly of individual and binary assembly mixtures of ∼1 μm microspheres around microfabricated photoresist posts using both experiment and simulation. The particles include a semiconductor (TiO 2 ) and two insulating materials, one inorganic (SiO 2 ) and one organic [poly(methyl methacrylate) (PMMA)]. Individually, SiO 2 and PMMA assembled atop photoresist posts as the frequency and voltage were increased, displaying negative dielectrophoresis. TiO 2 particles assembled around the sides of the posts at low frequencies and atop the posts only at higher frequencies and voltages. These behaviors for all particle types were observed in both simulation and experiment. Mixtures of TiO 2 particles with either SiO 2 or PMMA, however, did not show a straightforward combination of their individual assembly properties, and their assembly depended upon the relative concentrations of the two particle types. This phenomenon brings to light an electromodulative shielding effect that can affect multiparticle assemblies. By adjusting conditions, it was possible to reconfigure assemblies of semiconducting and insulating particles to sort them to different sites or combine them together. These experiments and simulations provide insights into the assembly of particles with varying material properties, helping set the stage for the development of functional binary systems able to provide field-responsive spatial variations in refractive index and/or tunable scattering.

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“…(1) Differences in topography From the perspective of its mountainous terrain and geographical features, Northeast China is an important plain area in China at that time due to the flat terrain, vast land and abundant wild animals and plants, which determines that the agriculture, forestry, animal husbandry, and other agricultural economies here will be relatively developed. Some [8][9][10]. Directly influenced by the national life and cultural customs, history and geographical and cultural environment, it has strong ethnic regional cultural characteristics and rough and open-minded ethnic cultural characteristics, which is reflected in other national cultural and artistic ideologies [11].…”

Section: National Characteristics Of Northeast Chinamentioning

confidence: 99%

Art Form of Ethnic Minorities in Northeast China

2020

IJAID

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Each ethnic group has its own cultural characteristics and its own form of folk art. The diverse forms of folk art of ethnic minorities not only enrich people China's cultural life has further promoted the development and prosperity of our national culture. This article aims to study the art forms of ethnic minorities in the Northeast, analyze and summarize the students of ethnic minority colleges and universities to understand the art forms of the ethnic minorities in the Northeast and realize the importance of disseminating the art forms of the inheritance; And the impact of dissemination; a special survey on the perception of the influence of dissemination of the art form of ethnic minorities in the northeast of the ethnic minorities in the usual study and life in the population by investigating the influence of 50 classmates on minority culture and dissemination data. It was found that most students understand the art forms of ethnic minorities and realize that it is very important to spread the art forms of inheritance; at the same time, bringing the culture of ethnic minorities into the daily learning life can increase students' understanding of the art forms of the minority and the importance of inheriting art form. On the other hand, it can also be seen that the inheritance of ethnic art forms has a huge penetration in the study and life, and has a certain impact on the local culture. The art form of ethnic minorities is not only an important part of the Chinese civilization, but also an embodiment of culture. Most people said that they should pay attention to the dissemination of minority art form culture. The study of the art forms of ethnic minorities in the Northeast has guiding significance for the protection and inheritance of culture.

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Reconfigurable Positioning of Vertically-Oriented Nanowires Around Topographical Features in an AC Electric Field

Cited by 6 publications

References 85 publications

Particle-Based Reconfigurable Scattering Masks for Lensless Imaging

Particle-Based Reconfigurable Scattering Masks for Lensless Imaging

Effect of Particle Composition on Dielectrophoretic Co-Assemblies around Topographic Features: Experiment and Theory

Art Form of Ethnic Minorities in Northeast China

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