Mesoscale modelling of droplets’ self-assembly in microfluidic channels

Soft Matter ◽  
2021 ◽  
Author(s):  
Andrea Montessori ◽  
Adriano Tiribocchi ◽  
Marco Lauricella ◽  
Fabio Bonaccorso ◽  
Sauro Succi
Keyword(s):  
Self Assembly ◽  
Early Stage ◽  
Microfluidic Channels ◽  
Contact Interactions ◽  
Mesoscale Modelling ◽  
Multicomponent Flows

A recently proposed mesoscale approach for the simulation of multicomponent flows with near-contact interactions is employed to investigate the early stage formation and clustering statistics of soft flowing crystals in microfluidic channels.

scholarly journals Mesoscale modelling of near-contact interactions for complex flowing interfaces

2019 ◽  
Vol 872 ◽  
pp. 327-347 ◽  
Author(s):  
A. Montessori ◽  
M. Lauricella ◽  
N. Tirelli ◽  
S. Succi
Keyword(s):  
Surface Tension ◽  
Effective Viscosity ◽  
Short Range ◽  
Complex Dynamics ◽  
Contact Interactions ◽  
Mesoscale Modelling ◽  
Fluid Interface ◽  
Multicomponent Flows ◽  
Micro Channels ◽  
Effect Of Surface

We present a mesoscale kinetic model for multicomponent flows, augmented with a short range forcing term, aimed at describing the combined effect of surface tension and near-contact interactions operating at the fluid interface level. Such a mesoscale approach is shown to (i) accurately capture the complex dynamics of bouncing colliding droplets for different values of the main governing parameters, (ii) predict quantitatively the effective viscosity of dense emulsions in micro-channels and (iii) simulate the formation of the so-called soft flowing crystals in microfluidic focusers.

Stochastic Computing via In Operando Modulation of Rectification in Molecular Tunneling Junctions

2020 ◽  
Author(s):  
Xinkai Qiu ◽  
Sylvia Rousseva ◽  
Gang Ye ◽  
Jan C. Hummelen ◽  
Ryan Chiechi
Keyword(s):  
Self Assembly ◽  
Variable Temperature ◽  
Self Assembled Monolayers ◽  
Microfluidic Channels ◽  
Proof Of Concept ◽  
Glycol Ethers ◽  
Stochastic Computing ◽  
Assembled Monolayers ◽  
In Operando ◽  
Tunneling Junctions

This paper describes the reconfiguration of molecular tunneling junctions during operation via the self-assembly of bilayers of glycol ethers. We use well-established functional groups to modulate the magnitude and direction of rectification in assembled tunneling junctions by exposing them to solutions containing different glycol ethers. Variable-temperature measurements establish that rectification occurs by a bias-dependent tunneling-hopping mechanism and that glycol ethers, beside being an unusually efficient tunneling medium, behave identically to alkanes. We fabricated memory bits from crossbar junctions prepared by injecting eutectic Ga-In into microfluidic channels. Two 8-bit registers were able to perform logical AND operations on bit strings encoded into chemical packets as microfluidic droplets that alter the composition of the crossbar junctions through self-assembly to effect memristor-like properties. This proof of concept work demonstrates the potential for fieldable molecular-electronic devices based on tunneling junctions of self-assembled monolayers and bilayers.

scholarly journals The macroscopic shape of assemblies formed from microparticles based on host–guest interaction dependent on the guest content

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Takahiro Itami ◽  
Akihito Hashidzume ◽  
Yuri Kamon ◽  
Hiroyasu Yamaguchi ◽  
Akira Harada
Keyword(s):  
Molecular Recognition ◽  
Smart Materials ◽  
Self Assembly ◽  
Early Stage ◽  
Contact Point ◽  
Sodium Acrylate ◽  
Contact Points ◽  
Assembly Behavior ◽  
Small Clusters ◽  
Macroscopic Shape

AbstractBiological macroscopic assemblies have inspired researchers to utilize molecular recognition to develop smart materials in these decades. Recently, macroscopic self-assemblies based on molecular recognition have been realized using millimeter-scale hydrogel pieces possessing molecular recognition moieties. During the study on macroscopic self-assembly based on molecular recognition, we noticed that the shape of assemblies might be dependent on the host–guest pair. In this study, we were thus motivated to study the macroscopic shape of assemblies formed through host–guest interaction. We modified crosslinked poly(sodium acrylate) microparticles, i.e., superabsorbent polymer (SAP) microparticles, with β-cyclodextrin (βCD) and adamantyl (Ad) residues (βCD(x)-SAP and Ad(y)-SAP microparticles, respectively, where x and y denote the mol% contents of βCD and Ad residues). Then, we studied the self-assembly behavior of βCD(x)-SAP and Ad(y)-SAP microparticles through the complexation of βCD with Ad residues. There was a threshold of the βCD content in βCD(x)-SAP microparticles for assembly formation between x = 22.3 and 26.7. On the other hand, the shape of assemblies was dependent on the Ad content, y; More elongated assemblies were formed at a higher y. This may be because, at a higher y, small clusters formed in an early stage can stick together even upon collisions at a single contact point to form elongated aggregates, whereas, at a smaller y, small clusters stick together only upon collisions at multiple contact points to give rather circular assemblies. On the basis of these observations, the shape of assembly formed from microparticles can be controlled by varying y.

Aggregation of modified hexabenzocoronenes as models for early stage asphaltene self-assembly

2018 ◽  
Vol 44 (12) ◽  
pp. 992-1003 ◽  
Author(s):  
Lidiya Gavrilenko ◽  
Jeffery B. Klauda
Keyword(s):  
Self Assembly ◽  
Early Stage

Fabrication of Sharp-edged 3D microparticles via folded PDMS microfluidic channels

Lab on a Chip ◽  
2021 ◽  
Author(s):  
Chenchen Zhou ◽  
Shuaishuai Liang ◽  
Yongjian Li ◽  
Haosheng Chen ◽  
Jiang Li
Keyword(s):  
Significant Role ◽  
Self Assembly ◽  
Biomedical Engineering ◽  
Mechanical Engineering ◽  
Microfluidic Channels

3D microparticles have promising applications in self-assembly, biomedical engineering, mechanical engineering, etc. The shape of microparticles plays a significant role in their functionalities. Although numerous investigations have been conducted to...

Self-assembly of colloidal micelles in microfluidic channels

Soft Matter ◽  
2017 ◽  
Vol 13 (1) ◽  
pp. 222-229 ◽  
Author(s):  
Arash Nikoubashman
Keyword(s):  
Computer Simulations ◽  
Poiseuille Flow ◽  
Self Assembly ◽  
The Self ◽  
Microfluidic Channels ◽  
Distinct Cluster ◽  
Channel Center

The self-assembly of amphiphilic Janus colloids in microfluidic channels under Poiseuille flow is studied using computer simulations. The aggregates grow in the weakly sheared channel center, whereas a distinct cluster breakup occurs in strongly sheared channel regions.

Monitoring the Early Stage Self-Assembly of Enzyme-Assisted Peptide Hydrogels

2013 ◽  
Vol 66 (5) ◽  
pp. 572 ◽  
Author(s):  
Richard J. Williams ◽  
James Gardiner ◽  
Anders B. Sorensen ◽  
Silvia Marchesan ◽  
Roger J. Mulder ◽  
...  
Keyword(s):  
1H Nmr ◽  
Self Assembly ◽  
Early Stage ◽  
The Self ◽  
Spectroscopic Techniques ◽  
Subsequent Formation ◽  
Self Assembling ◽  
Hydrogel Formation ◽  
Assembly Kinetics ◽  
Peptide Hydrogels

The early stages of the self-assembly of peptide hydrogels largely determine their final material properties. Here we discuss experimental methodologies for monitoring the self-assembly kinetics which underpin peptide hydrogel formation. The early stage assembly of an enzyme-catalysed Fmoc-trileucine based self-assembled hydrogel was examined using spectroscopic techniques (circular dichroism, CD, and solution NMR) as well as chromatographic (HPLC) and mechanical (rheology) techniques. Optimal conditions for enzyme-assisted hydrogel formation were identified and the kinetics examined. A lag time associated with the formation and accumulation of the self-assembling peptide monomer was observed and a minimum hydrogelator concentration required for gelation was identified. Subsequent formation of well defined nano- and microscale structures lead to self-supporting hydrogels at a range of substrate and enzyme concentrations. 1H NMR monitoring of the early self-assembly process revealed trends that were well in agreement with those identified using traditional methods (i.e. HPLC, CD, rheology) demonstrating 1H NMR spectroscopy can be used to non-invasively monitor the self-assembly of peptide hydrogels without damaging or perturbing the system.

scholarly journals Microfluidic Preconcentration Chip with Self-Assembled Chemical Modified Surface for Trace Carbonyl Compounds Detection

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4402 ◽  
Author(s):  
Jie Cheng ◽  
Jianwei Shao ◽  
Yifei Ye ◽  
Yang Zhao ◽  
Chengjun Huang ◽  
...  
Keyword(s):  
Water Quality ◽  
Self Assembly ◽  
Carbonyl Compounds ◽  
Microelectromechanical Systems ◽  
Fem Analysis ◽  
Microfluidic Channels ◽  
Chemical Surface ◽  
Chemical Surface Modification ◽  
Pillar Arrays ◽  
Low Sensitivity

Carbonyl compounds in water sources are typical characteristic pollutants, which are important indicators in the health risk assessment of water quality. Commonly used analytical chemistry methods face issues such as complex operations, low sensitivity, and long analysis times. Here, we report a silicon microfluidic device based on click chemical surface modification that was engineered to achieve rapid, convenient and efficient capture of trace level carbonyl compounds in liquid solvent. The micro pillar arrays of the chip and microfluidic channels were designed under the basis of finite element (FEM) analysis and fabricated by the microelectromechanical systems (MEMS) technique. The surface of the micropillars was sputtered with precious metal silver and functionalized with the organic substance amino-oxy dodecane thiol (ADT) by self-assembly for capturing trace carbonyl compounds. The detection of ppb level fluorescent carbonyl compounds demonstrates that the strategy proposed in this work shows great potential for rapid water quality testing and for other samples with trace carbonyl compounds.

Spin-Coating Self-Assembly for Micropatterning of Ultrathin Multilayer Films

2003 ◽  
Vol 775 ◽  
Author(s):  
Hongseok Jang ◽  
Sangcheol Kim ◽  
Kookheon Char
Keyword(s):  
Ultrathin Films ◽  
Self Assembly ◽  
Multilayer Films ◽  
Process Time ◽  
Microfluidic Channels ◽  
Layer By Layer ◽  
New Approach ◽  
High Line ◽  
Spinning Process ◽  
Distinct Line

AbstractA new approach to create layer-by-layer assembled multilayer ultrathin films with welldefined micropatterns in a short process time is introduced. To achieve such micropatterns with high line resolution in organic multilayer films, microfluidic channels were combined with the convective self-assembly process employing both hydrogen bonding and electrostatic intermolecular interactions. The channels were initially filled with polymer solution by capillary pressure and the residual solution was then removed by spinning process. The micropatterns with distinct line boundaries were obtained and the small ridges were also observed at the edges of the patterned lines. Spin self-assembled vertical heterostructural multilayer patterning using (PVP/PAA)5 micropatterns, which were prepared with microfluidic channels, as a template was also investigated.

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