Quantum mechanics

Engineering

Nanoparticle

Materials science

Photothermal effect

Marangoni effect

Lubricant

Chemical engineering

Physics

Hysteresis

Nanotechnology

Photothermal therapy

Composite material

Wetting

Surface tension

Ethylene glycol

Advanced Functional Materials

A photoresponsive organogel surface (POS), which integrates characteristics of the photothermal property of Fe 3 O 4 nanoparticles and the low hysteresis feature of lubricant‐infused organogels, is shown. A photothermally induced dynamic temperature gradient can be formed rapidly at the location of near‐infrared‐light irradiation (NIR) on POS with suitable Fe 3 O 4 nanoparticles content. Thus, various droplets (e.g., water, glycerol, ethylene glycol, propylene glycol, and ethanol) can be transported effectively and nimbly (e.g., along desired trajectories with controllable velocity and direction, even run uphill and deliver solid particles). This work reveals a synergistic effect between the asymmetrical droplet deformation and the inside Marangoni flows, which forms a unique driving force for droplet transport with high efficiency. This finding offers insight into the design of novel responsive interface materials for droplet transportation, which would be significant for laboratory‐on‐a‐chip contexts, mass transportation, and microengines.

Droplets Manipulated on Photothermal Organogel Surfaces