Hydrogels is one of the most rapidly developing fields of materials science research. One interesting feature of these materials is that they are typically composed of 99% water. This confers them unique properties (biodegradability and biocompatibility), which make them extremely desirable for biological applications (such as drug delivery, tissue engineering, regenerative medicine, diagnostics and cell culture).
Recently more and more interesting applications have been discovered, showing that in the future they could even be used for cardiac tissue regeneration!
Read more about hydrogels for this application here: http://www.ncbi.nlm.nih.gov/pubmed/24406815
Read more about hydrogels in this interesting review: