Publications by authors named "N Hooshyar"
Article Synopsis
- Closed-loop recycling of plastics is crucial for meeting the increasing material demands of a growing population while conserving nonrenewable resources.
- The study focuses on the chemical recycling of polyurethane foams (PUFs) through acidolysis using dicarboxylic acids (DCAs) to obtain high-quality recyclable polyols.
- Findings reveal that the structure of DCAs significantly affects the speed of the recycling process, specifically how quickly polyols can be released, with key insights into the mechanisms at play allowing for improved recycling methods.
Article Synopsis
- Polyurethane (PU) is a widely used plastic, and recovering its valuable components through chemical recycling is crucial for managing its waste.
- Acidolysis, specifically using dicarboxylic acid (DCA) vapor at lower temperatures (<150 °C), offers an effective way to recover polyol from PU waste without the issues seen in high-temperature methods.
- This green chemistry approach minimizes unwanted byproducts and simplifies the process, making it easier to scale up and apply to commercial PU foam waste.
Chemical recycling of polyurethane (PU) waste is essential to displace the need for virgin polyol production and enable sustainable PU production. Currently, less than 20% of PU waste is downcycled through rebinding to lower value products than the original PU. Chemical recycling of PU waste often requires significant input of materials like solvents and slow reaction rates.
View Article and Find Full Text PDFWe experimentally investigate the effect of particles on the dynamics of a gas bubble rising in a liquid-solid suspension while the particles are equally sized and neutrally buoyant. Using the Stokes number as a universal scale, we show that when a bubble rises through a suspension characterized by a low Stokes number (in our case, small particles), it will hardly collide with the particles and will experience the suspension as a pseudoclear liquid. On the other hand, when the Stokes number is high (large particles), the high particle inertia leads to direct collisions with the bubble.
View Article and Find Full Text PDFComparison of the types of child utterances mothers expand in children with language delays and with Down's syndrome.
J Intellect Disabil Res
December 1996
Sixteen children with language delays and their mothers were studied to identify the types of child utterances mothers were most likely to expand. Eight of these children had Down's syndrome (DS), while the other eight were pairwise-matched for mean length of utterance (MLU) and did not have DS, but were language delayed. Twenty-minute mother-child free-play sessions were videotaped and transcribed.
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