John G. Brace

Hexamethyldisiloxane is used as a silicon‐source gas for plasma enhanced chemical vapor deposition (PECVD) growth of silicon oxide films for passivation layers in microelectronics. In order to produce low permeability films, it is necessary to minimize the carbon content. Films were deposited by a room temperature PECVD process in a parallel plate...

The use of a surface acoustic wave (SAW) device for measuring rate of gas flow is described. A delay‐line stabilized SAW oscillator is heated above the ambient by using a novel approach in which radio frequency (rf) energy is converted to heat via acoustic dissipation. This ‘‘self‐heating’’ arrangement eliminates the need for a separate heater and...

Disposal of plastic waste has become a widely discussed issue, due to the potential environmental impact of improper waste disposal. Polyethylene terephthalate (PET) packaging accounted for 44.7% of single-serve beverage packaging in the US in 2021, and 12% of global solid waste. A strategic solution is needed to manage plastic packaging solid wast...

Bottle-to-bottle recycling of PET

A polyethylene terephthalate container having a hydrogen generator and catalyst disposed or otherwise incorporated in components of the container. The container further comprises an indicator system or means for use with a hydrogen generator and a catalyst system.

A polyethylene terephthalate container having a hydrogen generator and catalyst disposed or otherwise incorporated in components of the container. The container further comprises an activation system or means for activating the hydrogen generator and/or catalyst system at a predetermined time or in response to a predetermined stimulus.

A sensor employs a SAW oscillator heated above the ambient by converting RF energy to heat via acoustic dissipation in energy absorbers located outside the path of propagation. The oscillator utilizes a delay line designed to support single mode operation, fabricated on a substrate. Low insertion loss results from placing the energy absorbers outsi...

A novel approach for measuring mass flow of gases is reported. A SAW (surface acoustic wave) delay line is heated above the ambient by absorbing RF power from an oscillator loop in which it also serves as the frequency-control element; forced convective cooling due to gas flow induces substantial frequency shifts. Utilization of RF power in the sen...

Application of surface acoustics waves to the study of fundamental properties of hygroscopic polymer/water systems is reported. The basic device used is a surface acoustic wave (SAW) delay-line oscillator, the propagation path of the delay line being coated with a film of the polymer to be studied. The frequency of the SAW oscillator is measured as...

Application of surface acoustic waves to the study of fundamental properties of hygroscopic polymer/water systems is reported. The frequency of a polymer- coated SAW delay-line oscillator is measured as a function of humidity at various temperatures. Thermodynamic function~ of free energy i6G) , enthalpy (6H) and entropy (6S) are then determined. T...

In the course of developing a sensor for simultaneous humidity and temperature sensing, we have investigated surface-acoustic-wave (SAV) transducers for use as tools in characterizing materials of interest in sensing applications. In this paper we report a computer-controlled test system for characterizing oscillator-based sensors and demonstrate t...

In the course of developing a sensor for simultaneous humidity and temperature sensing, surface acoustic wave (SAW) transducers were investigated for use as tools in characterizing materials of interest in sensing applications. A computer controlled test system is reported for characterizing oscillator based sensors and the utility of SAW oscillato...

A technique is described for measuring humidity with high sensitivity and wide dynamic range using surface acoustic waves. A delay-line-stabilized SAW oscillator is used, the delay line being coated with a thin film of a suitable hygroscopic material. Sorption of moisture produces rapid changes in the electrical and mechanical properties of the fil...

The Fe 2p3/2 and N 1s X-ray PES binding energies for the dimeric iron porphyrin complexes μ-nitrido-bis[α,β,γ,δ-tetraphenylporphinatoiron] and μ-oxo-bis[α,β,γ,δ-tetraphenylporphinatoiron] are reported. In addition, X-ray PES binding energies for the monomeric α,β,γ,δ-tetraphenylporphinatoiron cation with selected anions (ClO4-, Br-, Cl-, and N3-) a...

A report is presented on the influence of some metal dopants on the optical indices of TiO//2 determined between 250 and 2000 nm with a spectrophotometric fitting method described elsewhere. These results are compared with the valence-band spectra obtained with x-ray photoelectron spectroscopy (XPS). This latter technique also allows us to monitor...

X-ray photoelectron spectroscopic data are reported for N-methyltetraphenylporphyrin, its dicationic salt, and a number of metal complexes, with special attention given to the N 1s binding energies. The free-base N 1s energies are 397.6 and 399.9 eV, with the N-CH3 nitrogen atom being perturbed to essentially the same extent as the N-H nitrogen ato...

X-ray photoelectron spectroscopy has been employed to probe the water content of aggregates of pheophytin a and chlorophyll a. The O 1s spectra of these compounds show a distinct shoulder at 533.7 eV when water is present, which is used to calculate the number of bound waters of hydration of the aggregate. We have been unable to observe anhydrous c...