  The paper provides data on measuring electrical properties of supercooled
water in nanoporous silica MCM-41 with 3.5 nm diameter cylindrical pores, using
the methods of dielectric spectroscopy and measuring proper electrical
fluctuations at low frequencies. Occurrence of non-linear media properties at
the temperatures below -35 C was determined, which was revealed in the form of
registered cell capacity dependence on voltage amplitude in it, as well as
noise increase close to -40 C. The effects observed are supposed to be related
to the earlier predicted ferroelectric phase transition.
