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Some water confined inside self-assembled structures made from specially designed lipids can avoid forming ice below 0 °C. The finding is about nanoscale water pockets—not bulk water—and the water’s state depends on how much is present and which lipid structure forms. In the study, researchers reported amorphous confined water at temperatures down to about 10 K (−263 °C); that is not ordinary liquid water remaining liquid at that temperature.
What the researchers designed
The study examined synthetic monoacylglycerols whose hydrophobic chains were modified with cyclopropyl groups. The researchers varied the groups’ number and position, as well as the lipid chain length and curvature. When mixed with water, these lipids self-assembled into liquid-crystalline structures, including lamellar and bicontinuous cubic phases.
Those structures create water-containing domains only nanometres across. The small, confined spaces make it harder for water molecules to organize into the ordered crystal structure of ice. The researchers investigated how lipid composition and water content shaped the resulting phases and water states using experiments and molecular-dynamics simulations. The primary study appeared in Nature Nanotechnology in 2019.
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Water does not have one state across all the samples and temperatures in this work. Depending on the lipid phase and hydration, confined water may be subzero liquid, glassy, amorphous, or crystalline ice. “Amorphous” means it lacks the regular long-range crystal structure of ice; it does not mean that the sample is ordinary liquid water.
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The headline result—amorphous water observed under nanoconfinement down to approximately 10 K, or −263 °C—therefore needs two qualifications: the water was inside designed lipid structures, and it was reported as amorphous rather than as bulk liquid. The finding does not show that a conventional body of water, or water with a general-purpose additive, stays liquid at cryogenic temperatures.
Why water content changes the result
The study’s results show that hydration is a key part of the behavior. Differential scanning calorimetry (DSC), which detects thermal transitions such as ice melting, found no ice-melting peaks in DCPML samples containing 5% or 10% water. Peaks were reported in samples containing 15%, 20%, and 25% water. At 7.5% water, DCPML lacked the reported freezing-transition peak, while the comparison ML sample showed one near −8 °C. At 15% water, DCPML showed a transition near −9 °C.
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Scattering measurements at −30 °C make the composition difference especially clear: wide-angle X-ray scattering (WAXS) found no crystalline ice pattern in a DCPML sample with 10% water, while a sample with 25% water showed a pattern typical of hexagonal ice. These are findings for the specific formulations and conditions studied, not a rule that all DCPML samples—or all nanoconfined water—remain ice-free.
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How the study examined the water and lipid phases
The researchers combined complementary methods to characterize structure, composition, and transitions. These included DSC, neutron scattering, WAXS, nuclear magnetic resonance (NMR), and small-angle X-ray scattering (SAXS), alongside molecular-dynamics simulations. Together, the methods supported a phase interpretation in which both the lipid structure and water fraction matter.
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The paper’s significance is primarily physical chemistry: it offers a way to study how lipid assemblies interact with water when space is tightly constrained. The authors connect that question to understanding how organisms may withstand extreme cold, but the study does not establish a biological treatment, a food-preservation method, an antifreeze product, or a commercial technology. Chemistry World’s coverage of the finding likewise discusses the potential significance rather than a demonstrated application.
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