Abstract: The electronic device with a layer of mesoporous silica can be obtained by applying a composition comprising alkoxysilane, a surfactant and a solvent onto a substrate, and by subsequently removing the surfactant and the solvent. The customary dehydroxylation treatment is not necessary if the composition contains a mixture of tetra-alkoxysilane, particularly teatraethoxyorthosilicate (TEOS), and an alkyl-substituted alkoxysilane, particularly a phenyl-substituted, methyl-substituted or ethyl-substituted trialkoxysilane. If both silanes are present in a molar ratio of approximately 1:1, a layer with a dielectric constant of 2.5 or less is obtained.

Abstract: The electric device (1, 100) comprises a resistor (36, 250) comprising a phase change material which is able to be in a first phase and in a second phase. The resistor (36, 250) has an electrical resistance which has a first value when the phase change material is in the first phase and a second value when the phase change material is in the second phase. The resistor (36, 250) is electrically connected to a first conductor (3, 130A, 130B) and a second conductor (4, 270), which are able to conduct a current for heating of the phase change material to enable a transition from the first phase to the second phase. The electric device (1, 100) further comprises a layer (20, 39, 126, 140, 260) of a dielectric material for reducing a heat flow to parts of the body (2, 101) free of the resistor (36, 250) during the heating, which dielectric material according to the invention comprises a porous material with pores having a size between 0.5 and 50 nm.