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Skinless polymer foam was prepared by treating poly(methyl methacrylate) (PMMA) with supercritical carbon dioxide (scCO 2 ). The film was immersed in scCO 2 with ethanol to nucleate, and then incubated in a hot water bath to induce nuclear growth and to prepare skinless PMMA foam. The obtained polymer foam had a low density and cells were connected to each other to make channels through...
InGaAsP/InP multiquantum-well (MQW) structures have been successfully grown by low-pressure MOCVD. The abruptness of the As atom profile was measured to be 20 ? by SIMS analysis. Continuous operation of InGaAsP/InP lasers using MQW structure has been achieved at 80 K.
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