Effect Of Heat Pretreatment Research Articles

Effect of heat pretreatment on electrical conductance changes by NO2 adsorption of lead phthalocyanine thin film

The sensing characteristics of an NO2 gas sensor using lead phthalocyanine thin film are influenced by heat-pretreatment time and ambient gas. The response behaviour of conductance for the change in ambient gas was characterized using Elovich's equation. The first stage in the adsorption and desorption kinetics reflects surface phenomena and the second stage the film diffusion. Both components were improved by heat treatment in air. The rising time in the NO2 adsorption process was within 2 min, and the recovery time within 5 min at 130 °C for the film annealed in air for 1 h. The heat pretreatment induced the formation of a continuous layer of fine particles, ∼ 0.1 μm in size, and larger single crystals isolated from each other, which formed on the continuous layer. The formation of the larger single crystals is not preferable in fabricating a sensor with fast rising and recovery times.

Effect of heat pretreatment on electrical conductance changes by NO2 adsorption of lead phthalocyanine thin film

Effect of heat pretreatment on electrical conductance changes by NO2 adsorption of lead phthalocyanine thin film

花こう岩の粉砕と雲母の分離・利用について

The effect of heat pre-treatment in the crushing of granite was investigated. The reduction of crushing energy was found to greatly depend on the prodcut size of granite as well as on the temperature of heat treatment. The magnetization of mica was also observed to increase by the heat treatment.Mica was recovered by first-stage magnetic separtion up to 98% by weight. In order to find one of the possible uses of mica, its aptitude as a filler for resings was examined. Mica was mixed with polyvinylchloride and the mechanical strength of the mixture was measred. As a result, mica showed almost the same reinforcing effect as talc which was popular filler for resins.

Effect of heat pretreatment on the electrical conductance of lead phthalocyanine films for NO2 gas detection

The effect of heat pretreatment on the electrical conductance and on the sensitivity to electrophilic gas (10 p.p.m. in NO 2 /air) was studied systematically for PbPc films on alumina substrates

Effect of heat pretreatment and strain rate on tensile properties of polycarbonate sheet

The effects of heat pretreatment and ambient gas (air and vacuum) on selected properties of the polycarbonate sheet have been studied. Changes in tensile properties as functions of heat pretreatment temperature (up to 160°C) and strain rate (wide range of 1.7 × 10−4 − 13.1 m/sec = 0.29 − 2.3 × 104 %/sec) were determined and these are discussed in relation to changes in differential scanning calorimetry (DSC) and gel permeation chromatography (GPC) data. The performance characteristics of the present tensile testing are obtained over a wide range of extension rates without changing the mode of deformation and the shape of the test pieces. It was suggested from the experimental results that heat pretreatment below the glass transition temperature (Tg) causes ordered molecular domains to grow on the free surfaces of the sheet, consisting of thermally deteriorated macromolecules and possessing lower crazing stresses (exhibiting more brittle mechanical responses, leading to the decrease in breaking strain and energy). The effect of annealing above Tg on the tensile properties, and on the results of DSC and GPC, could not be precisely understood.

Effect of Heat Pretreatment on the Early Forcing of Seakale

Effect of Heat Pretreatment on the Early Forcing of Seakale