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Related Concept Videos

Radial System Protection01:23

Radial System Protection

Radial systems employ time-delay overcurrent relays to reduce load interruptions. When a fault occurs, the nearest breaker opens first, while upstream breakers remain closed due to longer delay settings. This approach ensures minimal disruption to the rest of the system.
In a radial system with a fault downstream of the third breaker, ideally, only the third breaker will open, isolating the fault and interrupting the load connected beyond it. The second breaker has a longer delay setting,...
One-Degree-of-Freedom System01:24

One-Degree-of-Freedom System

In mechanical engineering, one-degree-of-freedom systems form the basis of a wide range of electrical and mechanical components. Using these models, engineers can predict the behavior of various parts in a larger system, which gives them insight into how different forces interact with each other.
A one-degree-of-freedom system is defined by an independent variable that determines its state and behavior. One example of a one-degree-of-freedom system is a simple harmonic oscillator, such as a...
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
Support Reactions in Three Dimensions01:27

Support Reactions in Three Dimensions

Support reactions in three dimensions help maintain the stability and equilibrium of various structures and systems. These reactions prevent the system from translating and rotating, ensuring the design can withstand external forces and perform its intended function efficiently and safely. Some of the supports providing support reactions in three dimensions are discussed below:
Ball and Socket Joint is one of the supports allowing free rotation about any axis. This freedom of rotation is...
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...

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Updated: May 31, 2026

The Modular Design and Production of an Intelligent Robot Based on a Closed-Loop Control Strategy
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The Modular Design and Production of an Intelligent Robot Based on a Closed-Loop Control Strategy

Published on: October 14, 2017

Deterministic radial displacement: modular, reconfigurable, and reusable.

Sean C McCabe1, Shilun Feng2, David W Inglis1

  • 1School of Engineering, Macquarie University, Sydney, 2109, Australia.

Lab on a Chip
|May 29, 2026
PubMed
Summary

Deterministic radial displacement (DRD) offers a reusable and reconfigurable microparticle separation method. This modular system, fabricated using 3D printing, demonstrates significant enrichment of specific particle sizes and promises broad applications.

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Reconfigurable Microfluidic Channel with Pin-discretized Sidewalls
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Reconfigurable Microfluidic Channel with Pin-discretized Sidewalls

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The Modular Design and Production of an Intelligent Robot Based on a Closed-Loop Control Strategy
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Published on: October 14, 2017

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10:39

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Published on: April 12, 2018

Area of Science:

  • Microfluidics
  • Biotechnology
  • Materials Science

Background:

  • Deterministic lateral displacement (DLD) is a monolithic microparticle separation technique.
  • Existing DLD devices lack reusability and reconfigurability due to their fixed, monolithic design.

Purpose of the Study:

  • To investigate the performance of deterministic radial displacement (DRD) devices for microparticle separation.
  • To assess the impact of curvature on critical particle size in DLD geometries.
  • To develop a reusable and reconfigurable microparticle separation system using 3D printing.

Main Methods:

  • COMSOL simulations were used to model 2D and cylindrically swept DLD geometries.
  • Scale models of DRD devices were fabricated using low-cost resin 3D printing.
  • Experimental testing was performed to evaluate particle enrichment and device reusability.

Main Results:

  • The critical particle size in DRD devices showed slight changes with curvature.
  • A 3D printed DRD device enriched particles between 134 and 200 μm by an average of fourfold.
  • The DRD device was successfully reused three times with minimal segment replacement, demonstrating modularity and durability.

Conclusions:

  • DRD devices offer a modular, reusable, and reconfigurable alternative to traditional DLD systems.
  • 3D printing facilitates the fabrication of cost-effective and customizable DRD devices.
  • DRD technology holds significant potential for sample preparation and purification applications.