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

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...

2020 ◽  
Author(s):  
Xinkai Qiu ◽  
Sylvia Rousseva ◽  
Gang Ye ◽  
Jan C. Hummelen ◽  
Ryan Chiechi

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.


Soft Matter ◽  
2021 ◽  
Author(s):  
Andrea Montessori ◽  
Adriano Tiribocchi ◽  
Marco Lauricella ◽  
Fabio Bonaccorso ◽  
Sauro Succi

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.


Author(s):  
Michael D. Nowak

We have developed a course combining a Mechanical Engineering Materials Laboratory with a Materials Science lecture for a small combined population of undergraduate Mechanical and Biomedical Engineering students. By judicious selection of topic order, we have been able to utilize one lecture and one laboratory for both Mechanical and Biomedical Engineering students (with limited splitting of groups). The primary reasons for combining the Mechanical and Biomedical students are to reduce faculty load and required resources in a small university. For schools with medium or small Mechanical and Biomedical Engineering programs, class sizes could be improved if they could include other populations. The heterogeneous populations also aid in teaching students that the same engineering techniques are useful in more than a single engineering realm. The laboratory sections begin with the issues common to designing and evaluating mechanical testing, followed by tensile, shear, and torsion evaluation of metals. To introduce composite materials, wood and cement are evaluated. While the Mechanical Engineering students are evaluating impact and strain gauges, the Biomedical Engineering students are performing tensile studies of soft tissues, and compression of long bones. The basic materials lectures (beginning at the atomic level) are in common with both Mechanical and Biomedical student populations, until specific topics such as human body materials are discussed. Three quarters of the term is thus taught on a joint basis, and three or four lectures are split. Basic metal, plastic and wood behavior is common to both groups.


2012 ◽  
Vol 566 ◽  
pp. 304-307
Author(s):  
Marija Gradinscak

Globalisation is accelerating and with it rapid technological change has resulted in the environment being dramatically impacted by constant and significant change. The global job market requires excellent technical skills, so we must educate students for more sophisticated jobs. Today, engineers must be practical and creative, able to work with different people, be quick to solve problems and make critical business decisions, whilst being professional and ethical. Spatial visualisation skills play a significant role in engineering fields, particularly for mechanical engineering students whose fields rely heavily on visualisation. This paper presents the CAD course with computer graphics components that would help in enhancing students’ powers of visualisation using CAD applications.


Soft Matter ◽  
2017 ◽  
Vol 13 (1) ◽  
pp. 222-229 ◽  
Author(s):  
Arash Nikoubashman

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.


RSC Advances ◽  
2014 ◽  
Vol 4 (48) ◽  
pp. 25040-25050 ◽  
Author(s):  
Yanzhen Yin ◽  
Shufei Jiao ◽  
Chao Lang ◽  
Junqiu Liu

A smart supramolecular artificial glutathione peroxidase (GPx) with tunable catalytic activity was prepared based on host–guest interaction and a blending process. The change of the self-assembled structure of SGPxmax during the temperature responsive process played a significant role in altering the temperature responsive catalytic behavior.


Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4402 ◽  
Author(s):  
Jie Cheng ◽  
Jianwei Shao ◽  
Yifei Ye ◽  
Yang Zhao ◽  
Chengjun Huang ◽  
...  

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.


2003 ◽  
Vol 775 ◽  
Author(s):  
Hongseok Jang ◽  
Sangcheol Kim ◽  
Kookheon Char

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.


2008 ◽  
Vol 7 (7) ◽  
pp. 581-587 ◽  
Author(s):  
Su Eun Chung ◽  
Wook Park ◽  
Sunghwan Shin ◽  
Seung Ah Lee ◽  
Sunghoon Kwon

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