Wearable microfluidics: fabric-based digital droplet flowmetry for perspiration analysis

Here we show for the first time a wearable microfluidic platform, named as digital droplet flowmetry (DDF), implemented on all-textile materials for real-time measurement of perspiration rates, via converting continuous flow into discrete droplets with identical volumes and assessing the flow rates by an electronic counting circuitry.

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Real-Time Measurement of Dynamic Wheel-Rail Contacts Using Ultrasonic Reflectometry

Journal of Tribology ◽

10.1115/1.4043281 ◽

2019 ◽

Vol 141 (6) ◽

Cited By ~ 4

Author(s):

Lu Zhou ◽

Henry Brunskill ◽

Martin Pletz ◽

Werner Daves ◽

Stephan Scheriau ◽

...

Keyword(s):

Real Time ◽

Linear Measurement ◽

Time Measurement ◽

Contact Condition ◽

Cross Sectional ◽

Contact Patch ◽

Rail Network ◽

Real Time Measurement ◽

First Time ◽

Contact Predictions

The contact condition between the wheel and the rail is paramount to the lifespan, safety, and smooth operation of any rail network. The wheel/rail contact condition has been estimated, calculated, and simulated successfully for years, but accurate dynamic measurement has still not been achieved. Methods using pressure-sensitive films and controlled air flow have been employed, but both are limited. The work described in this paper has enabled, for the first time, the measurement of a dynamic wheel/rail contact patch using an array of 64 ultrasonic elements mounted in the rail. Previous work has successfully proved the effectiveness of ultrasonic reflectometry for static wheel/rail contact determination. The dynamic real-time measurement is based on previous work, but now each element of an array is individually pulsed in sequence to build up a linear measurement of the interface. These cross-sectional, line measurements are then processed and collated resulting in a two-dimensional contact patch. This approach is able to provide not only a contact patch, but more importantly, a detailed and relatively high-resolution pressure distribution plot of the contact. Predictions using finite element methods (FEM) have also been carried out for validation. Work is now underway to increase the speed of the measurement.

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Measuring the oxygen content of a single oil droplet

Chemical Science ◽

10.1039/c6sc02357f ◽

2016 ◽

Vol 7 (10) ◽

pp. 6458-6462 ◽

Cited By ~ 11

Author(s):

Ann Feng ◽

Wei Cheng ◽

Richard G. Compton

Keyword(s):

Real Time ◽

Oxygen Content ◽

Time Measurement ◽

Oxygen Carriers ◽

Oil Droplet ◽

Real Time Measurement ◽

Artificial Oxygen Carriers ◽

The Individual ◽

Individual Droplet ◽

First Time

Using toluene droplets as a model for artificial oxygen carriers, the real-time measurement of attomole oxygen contents at the individual droplet level is reported for the first time.

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A recyclable chitosan-based QCM biosensor for sensitive and selective detection of breast cancer cells in real time

The Analyst ◽

10.1039/c4an01532k ◽

2014 ◽

Vol 139 (23) ◽

pp. 6259-6265 ◽

Cited By ~ 31

Author(s):

Shaolian Zhang ◽

Haihua Bai ◽

Jinmei Luo ◽

Peihui Yang ◽

Jiye Cai

Keyword(s):

Breast Cancer ◽

Folic Acid ◽

Cancer Cells ◽

Real Time ◽

Breast Cancer Cells ◽

Time Measurement ◽

Selective Detection ◽

Real Time Measurement ◽

First Time ◽

Mcf 7

A sensitive and recyclable QCM biosensor for the real-time measurement of MCF-7 breast cancer cells was developed for the first time using folic acid coupled to chitosan as an excellent biocompatible biosensor film.

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