Refrigerating Mixtures Obtained with Solid Carbonic Acid

Tunnelling in carbonic acid.

The cis,trans-conformer of carbonic acid (H2CO3), generated by near-infrared radiation, undergoes an unreported quantum mechanical tunnelling rotamerization with half-lives in cryogenic matrices of 4-20 h, depending on temperature and host material. First-principles quantum chemistry at high levels of theory gives a tunnelling half-life of about 1 h, quite near those measured for the fastest ro...

Aqueous carbonic acid (H2CO3).

Carbonic acid (H2CO3) is a molecule right at the interface between organic and inorganic chemistry. In fact, according to some definitions it is an organic molecule, while according to others it is an inorganic molecule. Its exceptionality can also be recognized from the fact that it formally belongs neither to the mononor dicarboxylic acids, even though it is a C1 diprotic acid. The diprotic n...

Gallic Acid Production with Mouldy Polyurethane Particles Obtained from Solid State Culture of Aspergillus niger GH1.

Gallic acid production in a batch bioreactor was evaluated using as catalytic material the mouldy polyurethane solids (MPS) obtained from a solid-state fermentation (SSF) bioprocess carried out for tannase production by Aspergillus niger GH1 on polyurethane foam powder (PUF) with 5 % (v/w) of tannic acid as inducer. Fungal biomass, tannic acid consumption and tannase production were kinetically...

Photons refrigerating phonons

Characterization of Solid - Fluid Mixtures

In this work we investigate a mathematical model for the description of the mechanical behavior of soft, hydrated tissues with signiicant perfusion. We set up and derive the mathematical description and balance laws using the continuum mixture theory as the theoretical framework. The constitutive relations suitable to describe perfused soft tissue and appropriate boundary conditions are discuss...