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Conference Presentations by John Brace

Drafts by John Brace

Papers by John Brace

Polymers, Jun 11, 2022

Bottle-to-Bottle Recycling for the Beverage Industry: A Review.

Journal of the American Chemical Society, Jun 1, 1980

The Fe 2~312 and N 1s X-ray PES binding energies for the dimeric iron porphyrin complexes p-nitri... more The Fe 2~312 and N 1s X-ray PES binding energies for the dimeric iron porphyrin complexes p-nitrido-bis[a,P,y,6-tetraphenylporphinatoiron] and p-oxo-bis[a,P,y,G-tetraphenylporphinatoiron] are reported. In addition, X-ray PES binding energies for the monomeric a,P,y,&tetraphenylporphinatoiron cation with selected anions (C104-, Br-, CI-, and N3-) are found to be correlated with the half-wave potentials for reduction in the noncoordinating solvent dichloromethane. Comparisons are made between the previously reported infrared, Mossbauer, X-ray crystallographic, magnetic susceptibility, and electrochemical results and the X-ray PES data in an attempt to unambiguously assign the electron environment of the p-nitrido complex. In contrast to the p-oxo dimer and the monomers, the electronic configuration about each five-coordinate Fe atom in the p-nitrido dimer has been shown to be low spin.

Journal of vacuum science & technology, Jul 1, 1994

Hexamethyldisiloxane is used as a silicon-source gas for plasma enhanced chemical vapor depositio... more 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 reactor, and were characterized by infrared spectroscopy, ellipsometry, microbalance, and elastic recoil detection (ERD). The infrared-active carbon groups appear in Si–CH3, CHx, C=O, and SiC bands. A double band at 2343 cm−1 has also been seen to track these bands. Deposition rate data shows linear behavior as a function of the Hexamethyldisiloxane (HMDSO) concentration in the reactor. The carbon within the films ranges from 36% to <1% of the amount of carbon assisted with HMDSO required to grow the films, depending upon the oxygen flow rate. By comparing the ERD composition data to the infrared spectral data, a carbon content correlation value has been found, and a detailed study of the data reveals evidence of C–C bond existence within films having the greatest total carbon content. Finally, it appears that the 2343 cm−1 band corresponds to CO2 rotational bands, in which the distribution of rotational states is evidence of hindered molecular motion.

Chemischer Informationsdienst, Oct 16, 1979

Es werden die Daten der Photoelektronenspektren, speziell der N 1s‐Bindungsenergien, der freien B... more Es werden die Daten der Photoelektronenspektren, speziell der N 1s‐Bindungsenergien, der freien Base und von protoniertem N‐Methyltetraphenylporphyrin sowie seiner bekannten Komplexe (I) mit entsprechenden Daten für andere freie Porphyrinbasen verglichen.

Chemischer Informationsdienst, Sep 23, 1980

Inorganic Chemistry, Jul 1, 1979

to the modes around 1100-1300 CM-'.~ Alternatively negative interference of resonance effects of ... more to the modes around 1100-1300 CM-'.~ Alternatively negative interference of resonance effects of two different absorption bands27 may have occurred to the methine bridge stretching modes upon excitation at 568.2 nm. For the determination of the alternatives, observation of detailed structure of excitation profile with dye laser is indispensable and such a study is under progress for Ni(0EC).

Journal of the American Chemical Society, Aug 1, 1978

of Chlorophyll a-Water Aggregates 5203 chymotrypsin, dimethyl sulfoxide is by far the least harmf... more of Chlorophyll a-Water Aggregates 5203 chymotrypsin, dimethyl sulfoxide is by far the least harmful.* Furthermore, the catalytic pathway established for the enzyme in aqueous solutions is not changed by the addition of dlmethyl s~lfoxide,'~ nor does the conformation of the active site appear to be affected.lB (15) A.

In the course of developing a sensor for simultaneous humidity and temperature sensing, surface a... more 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 oscillator measurements is demonstrated for gaining insight into sorption processes in

Control of the distribution of a spray projected to an area In the course of experiments on the e... more Control of the distribution of a spray projected to an area In the course of experiments on the extinction of fires with water sprays, a simple method was found for controlling the distribution of a spray delivered to an area. This method, which is based on the use of pressure nozzles in radially arranged pars of impinging jets, is illustrated by considering two nozzles A and B (see the figure). Both nozzles contained six pairs of 9/64 in. impinging jets. Nozzle B gave a wider cone of spray than nozzle A, primarily because of the larger

In the course of developing a sensor for simultaneous humidity and temperature sensing, we have i... more In the course of developing a sensor for simultaneous humidity and temperature sensing, we have investigated surface-acoustic-wave (SAY) transducers for use as tools in characterizing materials of interest in sens ing applications. In this paper we report a computer controlled test system for characterizing oscillator based sensors and demonstrate the utility of SAY oscil lator measurements for ga1n1ng insight into sorption processes in glassy polymers.

A container (10) including: a hydrogen generator that generates dihydrogen; a catalyst that catal... more A container (10) including: a hydrogen generator that generates dihydrogen; a catalyst that catalyzes a chemical reaction between said hydrogen and oxygen, combining said hydrogen generator and said catalyst to provide oxygen removal capacity; and an indicator system indicating when said capacity oxygen extraction has decreased to or below a predetermined level, characterized in that said indicating system includes a sensitive adhesive label oxygen linking a label to the container, adhering least said adhesive oxygen sensitive to said container in oxygen label.

Polymers

Disposal of plastic waste has become a widely discussed issue, due to the potential environmental... more 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 waste. Major beverage manufacturers have pledged to reduce their environmental footprint by taking steps towards a sustainable future. The PET bottle has several properties that make it an environmentally friendly choice. The PET bottle has good barrier properties as its single-layer, mono-material composition allows it to be more easily recycled. Compared to glass, the PET bottle is lightweight and has a lower carbon footprint in production and transportation. With modern advancements to decontamination processes in the recycling of post-consumer recycled PET (rPET or PCR), it has become a safe material for reuse as beverage packaging. It has...

L'invention concerne un terephtalate de polyethylene presentant un generateur d'hydrogene... more L'invention concerne un terephtalate de polyethylene presentant un generateur d'hydrogene et un catalyseur disposes ou differemment integres dans des composants du contenant. Le contenant comprend en outre un systeme ou moyen d'indication destine a etre utilise avec un generateur d'hydrogene et un systeme catalyseur.

Polymers, Jun 11, 2022

Bottle-to-Bottle Recycling for the Beverage Industry: A Review.

Journal of the American Chemical Society, Jun 1, 1980

Journal of vacuum science & technology, Jul 1, 1994

Chemischer Informationsdienst, Oct 16, 1979

Chemischer Informationsdienst, Sep 23, 1980

Inorganic Chemistry, Jul 1, 1979

Journal of the American Chemical Society, Aug 1, 1978

Polymers

IEEE 1985 Ultrasonics Symposium, 1985

ABSTRACT A technique is described for measuring humidity with high sensitivity and wide dynamic r... more ABSTRACT 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 film. This results in a change in the velocity of the surface acoustic wave and hence in the frequency of the SAW oscillator. With polyimide used as the hygroscopic material, the frequency of a 75-MHz oscillator fabricated on a 128 degree Y-X LiNbO//3 substrate is found to vary by more than 150 kHz as the relative humidity is varied from near 0% RH to 100% RH. The calculated detection limit (assuming oscillator short-term stability of 1 part in 10**7 ) is less than 1. 5 ppm//v of humidity, or a corresponding dew point of -72 degree C. Simultaneous humidity and temperature sensing has been demonstrated using a dual-delay-line approach.

PETnology Americas 2020, 2020

Container modeling and shelf-life prediction can be highly cost-effective as a way to 'test' mult... more Container modeling and shelf-life prediction can be highly cost-effective as a way to 'test' multiple variables, particularly if they are container-design or-material variables. Using industry-standard software based on permeation/diffusion fundamentals, we analyze and predict whole-package ingress/egress as well as permeant interactions and quantities in sidewall and product. Selected examples will be given in PET or engineered-barrier containers of:
• SLLF determination by means of rapid prediction of oxidation and vitamin-destruction limit tests;
• filled-package (surrogate or product) long-term dO2 test-curve predictions and interpretation for oxygen-scavenger containers;
• dry-product isotherm development for clumping/crispness prediction in foods and food supplements;
• stability-test matrix reduction using Aw-based predictions of simulant (OTC surrogate) retention; and
• layer-placement considerations and attendant barrier-property loss in hygroscopic barrier polymers (via Tg simulation).
Complexity-levels of container simulation, and confirmation of empirically verifiable (testable) parameters will be discussed. At least one 'failure to launch' scenario (based on polymer-blend delamination) will be cited.