Effective dipole-dipole interactions in critical nanofluids

► Effective dipolar coupling of nanofluids strongly enhances at the critical point. ► The superradiation is amplified for hyperpolarized critical nanofluids (HCNFs). ► The HCNF have gigantic resonant frequency shift from the Larmor frequency. ► The free induction decay of the HCNF consists of periodic short bursts.