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Laser carved micro-crack channels in paper-based dilution devices
Qian Liu1, Chaoping Xu1, Heng Liang1
1Separation Science Institute, The Key Laboratory of Biomedical Information Engineering of Education Ministry, Xi'an Jiaotong University, Xi'an 710049, PR China.
Talanta
|August 27, 2017
Summary
Novel laser carved micro-crack (LCC) paper channels accelerate liquid flow 59x without pumps. This innovation enables rapid, low-cost microfluidic paper-based analytical devices (μPADs) for resource-limited settings.
Area of Science:
- Microfluidics
- Paper-based analytical devices (μPADs)
- Materials Science
Background:
- Traditional microfluidic devices often require external pumps for fluid manipulation.
- Paper-based analytical devices offer portability and cost-effectiveness but can be limited by flow rates.
- Accelerating liquid flow in paper-based systems is crucial for faster analysis and broader applications.
Purpose of the Study:
- To develop a novel method for enhancing liquid flow in paper-based microfluidic channels.
- To investigate the impact of laser-carved micro-cracks (LCC) on fluid dynamics.
- To fabricate and evaluate microfluidic paper-based analytical devices (μPADs) utilizing LCC technology.
Main Methods:
- Development of laser carved micro-crack (LCC) paper channels.
- Fabrication of T-junction microstructures using LCC technology.
- Quantitative analysis of flow velocity changes with varying laser power and micro-crack numbers.
- Design and testing of LCC-μPADs for dye and pH gradient generation.
Main Results:
- LCC channels demonstrated a 59-fold increase in aqueous solution flow velocity compared to solely-printed channels.
- Experimental data were accurately modeled by a developed time-distance quadratic trinomial.
- LCC-μPADs exhibited fast self-acting liquid transportation and high-performance mixing.
- Time cost for dye mixing gradient was reduced from 2355s to 123s using a five-stage LCC-μPAD.
Conclusions:
- Laser carved micro-crack technology significantly accelerates fluid flow in paper-based microfluidics without external pumps.
- LCC-μPADs offer rapid analysis, efficient mixing, and suitability for resource-limited environments.
- This technology enables quick, long-distance fluid transfer and disposable analytical devices.
