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    Optical forces can now manipulate opaque suspensions, previously thought impossible. This research demonstrates controlling particle concentration and inducing phase transitions using light-induced shock waves in these complex fluids.

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    Area of Science:

    • Physics
    • Optics
    • Fluid Dynamics

    Background:

    • Highly scattering, opaque suspensions were previously considered intractable for optical manipulation due to diffuse light fields.
    • Traditional optical forces rely on direct light-particle interaction, which is ineffective in opaque media.

    Purpose of the Study:

    • To demonstrate the theoretical and experimental possibility of optical manipulation in opaque particulate suspensions.
    • To investigate the role of multiply-scattered light in generating optical forces within opaque fluids.
    • To explore novel optofluidic applications enabled by light-induced particle manipulation in opaque media.

    Main Methods:

    • Theoretical modeling of optical forces exerted by multiply-scattered light in opaque suspensions.
    • Experimental validation using highly scattering nanoparticle suspensions.
    • Observation and characterization of light-induced shock fronts of particle concentration.

    Main Results:

    • Demonstrated that multiply-scattered light can generate significant optical forces in opaque suspensions.
    • Observed the formation and propagation of dense particle concentration shock fronts deep within opaque fluids.
    • Achieved optical transport, concentration, and localized 'writing' of nanoparticles using these shock fronts.
    • Induced localized phase transitions from suspension to gel within the opaque fluids.

    Conclusions:

    • Optical manipulation of opaque suspensions is achievable through forces generated by multiply-scattered light.
    • Light-induced shock waves offer a novel mechanism for controlling particle behavior and material properties in opaque fluids.
    • This breakthrough opens new avenues for optofluidic applications in complex, light-scattering media.