A New Thin-Film Piezoelectric Sensor for Easuring Methane Gas

To measure the concentration of CH4, we developed a thin film piezoelectric acoustic sensor (TFPAS), it accomplishes the detection of CH4 by the absorption of CH4 which can change the oscillation frequency of the piezoelectric crystal. The sensor is mainly composed by the piezoelectric film, sensitive film, silicon substrate and electrodes. The sensitive film is made up of nanometer-sized MgO scattered on pitch-based activated carbon fibers which has a strong adsorption of CH4. The piezoelectric film is a ZnO film which has very high piezoelectric characteristic parameters. The experimental results show that the sensitivity of the sensor to CH4 is very high. The response of the sensor to the presence of CH4 tested was found to be linear within a certain detection range and the detection error is less than 5%.

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Adsorption Activity of NO on Iron Oxide-Dispersed Porous Materials

Adsorption Science & Technology ◽

10.1177/026361748800500306 ◽

1988 ◽

Vol 5 (3) ◽

pp. 239-250 ◽

Cited By ~ 8

Author(s):

Katsumi Kaneko ◽

Katsuya Inouye

Keyword(s):

Iron Oxide ◽

Carbon Fibers ◽

Pressure Range ◽

Activated Carbons ◽

Silica Gels ◽

Activated Carbon Fibers ◽

High Adsorption ◽

Adsorption Activity ◽

Adsorption Rates ◽

Very High

Iron oxide-dispersed activated carbon fibers (ACF), granular activated carbons, zeolites, and silica gels have been prepared in order to develop good adsorbents for NO. The adsorption isotherms of NO on these samples have been measured at 303 K over an NO pressure range up to 80 kPa. The iron oxide-dispersed ACF samples (α- and β-ACF), obtained under the synthetic conditions employed for the preparation of α-FeOOH and β-FeOOH respectively, show very high adsorption activity for NO; their adsorption rates and capacities are much greater than those for untreated activated carbons, zeolites and silica gels. Furthermore, α- and β-ACF are effective in adsorbing NO from a 5 ppm NO/N2 gas mixture, reducing the concentration from 5 ppm to less than 1 ppm at 303 K after just one circulation with a flow velocity of 200 ml/min.

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DECOMPOSITION OF NO GAS BY COPPER IMPREGNATED ACTIVATED CARBON FIBERS

Frontiers on Separation Science and Technology ◽

10.1142/9789812702623_0082 ◽

2004 ◽

Author(s):

S. K. RYU ◽

W. K. LEE ◽

S. J. PARK

Keyword(s):

Activated Carbon ◽

Carbon Fibers ◽

Activated Carbon Fibers ◽

Decomposition Of No

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Oxidation of Activated Carbon Fibers: Effect on Pore Size, Surface Chemistry, and Adsorption Properties

Chemistry of Materials ◽

10.1021/cm990123m ◽

1999 ◽

Vol 11 (12) ◽

pp. 3476-3483 ◽

Cited By ~ 96

Author(s):

Christian L. Mangun ◽

Kelly R. Benak ◽

Michael A. Daley ◽

James Economy

Keyword(s):

Activated Carbon ◽

Surface Chemistry ◽

Pore Size ◽

Carbon Fibers ◽

Adsorption Properties ◽

Activated Carbon Fibers

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Visualized observation of pores in activated carbon fibers by HRTEM and combined image processor

Supramolecular Science ◽

10.1016/s0968-5677(98)00017-0 ◽

1998 ◽

Vol 5 (3-4) ◽

pp. 261-266 ◽

Cited By ~ 27

Author(s):

M. Endo ◽

T. Furuta ◽

F. Minoura ◽

C. Kim ◽

K. Oshida ◽

...

Keyword(s):

Activated Carbon ◽

Carbon Fibers ◽

Activated Carbon Fibers ◽

Image Processor

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Noise Reduction by Using Composite Plate

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.47-50.1229 ◽

2008 ◽

Vol 47-50 ◽

pp. 1229-1232

Author(s):

C.W. Chau ◽

Y.S. Choy ◽

Kin Tak Lau ◽

Yang Liu

Keyword(s):

Noise Reduction ◽

Carbon Fibers ◽

Side Branch ◽

Bending Stiffness ◽

Composite Panel ◽

Expansion Chamber ◽

Noise Abatement ◽

High Tension ◽

And Performance ◽

Very High

The plate silencer1 which consists of an expansion chamber with two side branch cavities covered by a light panel can achieve a desirable noise reduction in broadband theoretically. The concept is similar to drum silencer2. To attain optimal noise reduction, either the membrane should be of minimal weight while retaining very high tension or the panel should be kept with very high bending stiffness that is dependent on its geometry and mechanical properties. To achieve such goal, various kinds of composite system such as carbon fibers or aluminum were mounted on light core foam. A design of the composite panel which can provide a reduction in panel weight as well as enhance the bending stiffness, is introduced in this project. Predictions of the new model are to be compared with the normal foam plate in the aspects of noise reflection capability and performance of noise abatement apart from the material properties.

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An all-organic "soft" thin film transistor with very high carrier mobility

Advanced Materials ◽

10.1002/adma.19900021207 ◽

1990 ◽

Vol 2 (12) ◽

pp. 592-594 ◽

Cited By ~ 448

Author(s):

Francis Garnier ◽

Gilles Horowitz ◽

Xuezhou Peng ◽

Denis Fichou

Keyword(s):

Thin Film ◽

Carrier Mobility ◽

Thin Film Transistor ◽

High Carrier Mobility ◽

High Carrier ◽

Soft Thin Film ◽

Very High

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Preparation and Characterization of Activated Carbon Fibers from Jute Fibers by Phosphoric Acid Activation

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.184-185.1110 ◽

2012 ◽

Vol 184-185 ◽

pp. 1110-1113 ◽

Cited By ~ 1

Author(s):

Li Fen He ◽

Qi Xia Liu ◽

Tao Ji ◽

Qiang Gao

Keyword(s):

Activated Carbon ◽

Carbon Fiber ◽

Phosphoric Acid ◽

Carbon Fibers ◽

Activated Carbon Fibers ◽

Optimum Conditions ◽

Activation Time ◽

Activation Temperature ◽

Jute Fibers ◽

Activating Agent

Various jute-based activated carbon fibers were prepared by using jute fibers as raw materials and phosphoric acid as activating agent. The effects of three main factors such as concentration of activating agent, activation temperature and activation time on the yield and adsorptive properties of active carbon fibers were investigated via orthogonal experiments. The surface physical morphology of jute-based activated carbon fiber was also observed by using Scanning Electron Microscope. Results showed that the optimum conditions were phosphoric acid concentration of 4 mol/L, activation temperature of 600 °C and activation time of 1h. The yield, iodine number and amount of methylene blue adsorption of the active carbon fiber prepared under optimum conditions were 37.99 %, 1208.87 mg/g and 374.65 mg/g, respectively.

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