Shock waves in nanomechanical resonators

We study the formation of shock waves in a nanomechanical resonator with an embedded two-dimensional electron gas using surface acoustic waves. The mechanical displacement of the nanoresonator is read out via the induced acoustoelectric current. Applying acoustical standing waves, we are able to determine the so-called anomalous acoustocurrent. This current is found only in the regime of shock wave formation.     

Isothermal Titration Calorimetry of Molecularly Imprinted Polymer Nanospheres

Ultrasensitive isothermal titration calorimetry was used to generate thermodynamic data to assess the binding properties of molecularly imprinted polymer microgels. Microgels were imprinted using L ‐boc‐phenylalanine anilide (L ‐BFA) and then utilized in binding experiments with a variety of probe molecules, structurally closely related to the template molecule. Significant differences were observed between the binding enthalpy of the original template L ‐BFA and those of D ‐BFA, L ‐boc‐phenylalanine, L ‐boc‐tryptophane, and L ‐boc‐tyrosine.     

Preparation of polymers with polycarbonate sequences and their depolymerization; an example of thermodynamic recycling

Initiators based on hydroxytelechelic polyethylene oxide, polytetrahydrofuran and polydimethylsiloxane were used for the anionic ring-opening polymerization of 2.2-dimethyltrimethylene carbonate (DTC). Under suitable conditions high yields of block copolymers of the AB and ABA types were obtained, depending on the initiator used. Ring-closing depolymerization of poly(2.2-dimethyltrimethylene carbonate) [poly(DTC)] and of copolymers containing poly(DTC) blocks with catalysts based on potassium or tin results under suitable conditions in DTC.