AI Insight
Researchers have developed a new technology called capillaric circuits that can automatically control and sequence multiple types of liquids without pumps or external power. The system uses tiny channels and specialized valves (phase-to-phase valves, hydro-pneumatic relays, and multiphase domino valves) to handle both water-like liquids and oils or solvents in pre-programmed sequences using only capillary forces. The team demonstrated this technology by using it to automatically manufacture lipid nanoparticles on a chip, which are important for drug delivery applications.
Why it matters
This technology could enable portable, automated chemical and biological testing devices that don't require electricity or complex equipment, making sophisticated lab procedures accessible in resource-limited settings. The ability to manufacture lipid nanoparticles (similar to those used in some COVID-19 vaccines) on a simple chip could democratize advanced pharmaceutical production.
Understand the Science
⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Capillaric circuits (CCs) enable pre-programmed liquid handling through self-filling and passive valving governed by capillary forces, eliminating the need for external pumps and actuators. However, CCs optimized for high cohesion liquids (HCL) such as water are intrinsically unsuitable for programmed flow control of low cohesion liquids (LCL) such as oils and solvents because the high surface free energy needed for capillary flow of HCL results in uncontrolled, complete wetting by LCL. Here, we introduce a library of multiphase components including phase-to-phase valves (P2PV), hydro-pneumatic relays (HPR) and multiphase domino valves (MDVs) that collectively enable CCs to concomitantly process HCLs and LCLs. P2PVs use a pre-filled HCL to valve immiscible LCLs (e.g. oil) by confining the LCL, and upon triggering, hydraulically entrain it. To prevent uncontrolled mixing between miscible LCLs (e.g. ethanol) and the HCL, HPRs with an air gap and air waste are added to the P2PV. MDVs are further added and enable preprogrammed, sequential delivery of LCL and HCL by multiphase microfluidic chain reactions. Multiphase liquid processing is applied to automated, on-chip lipid nanoparticle (LNP) manufacturing, illustrating the potential of multiphase CCs.