Glass transition of nanometric polymer films probed by picosecond ultrasonics.

The possibility to measure the glass transition temperature in poly(methyl methacrylate) (PMMA) films by picosecond ultrasonics with thicknesses ranging from 458 nm to 32 nm is demonstrated. A shift of the longitudinal acoustic eigenmodes towards lower frequencies with temperature is observed accompanied by a change in the temperature-frequency slopes at the glass transition temperature. The contributions to the frequency shift from changes in film thickness and sound velocity are discussed and the latter is extracted below the glass transition temperature.

Electronic Communication of the Health Record and Information With Pediatric Patients and Their Guardians.

Communication of health data has evolved rapidly with the widespread adoption of electronic health records (EHRs) and communication technology. What used to be sent to patients via paper mail, fax, or e-mail may now be accessed by patients via their EHRs, and patients may also communicate securely with their medical team via certified technology. Although EHR technologies have great potential, their most effective applications and uses for communication between pediatric and adolescent patients, guardians, and medical teams has not been realized.

The Impact of Cost Conversations on the Patient-Physician Relationship.

Previous research has suggested that fear of harm to the patient-physician relationship is an important barrier to conversations about cost of care. However, few experimental studies have investigated the effects of cost of care conversations on the patient-physician relationship, particularly from the patient's perspective. In the current research, we take an experimental approach to investigate patients' attitudes and preferences for a hypothetical physician who discusses cost versus one who does not.

Interface Adhesion and Structural Characterization of Rolled-up GaAs/InGaAs Multilayer Tubes by Coherent Phonon Spectroscopy.

We present a detailed experimental and theoretical study of the acoustic phonon modes in rolled-up multilayers with thickness of the layers in the nanometre and diameters in the micrometre range. We compare our results to planar, unrolled multilayers grown by molecular beam epitaxy. For the planar multilayers the experimentally obtained acoustic modes exhibit properties of a superlattice and match well to calculations obtained by the Rytov model.

Plasmonic Hot Electron Solar Cells: The Effect of Nanoparticle Size on Quantum Efficiency.

Gold nanoparticles located at a metal oxide/hole conductor interface generate photocurrents upon visible light illumination. We demonstrate that the quantum efficiency of this process depends on the nanoparticle size. Gold nanoparticles (5 nm) show a maximum absorbed photon-to-electron conversion efficiency (APCE) of 13.