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Metal oxide blended ZSM-5 nanocomposites as ethanol sensors
Madhuri Lakhane, Rajendra S. Khairnar, Megha Mahabole, 2016, izvirni znanstveni članek

Opis: Nano-ZSM-5 is synthesized without organic template via microwave-assisted hydrothermal technique. The synthesized nano-ZSM-5 zeolite is blended with metal oxides (ZnO and TiO2) to have novel composites as ethanol sensors. The composites are characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR) techniques. A study on ethanol sensing behaviour of metal oxide blended composite screen-printed thick films is carried out and the effect of metal oxide concentration on various ethanol sensing features, specifically operating temperature, response/recovery time and active region of the sensor, are investigated. XRD and FTIR confirm the blending of metal oxides in ZSM-5 matrix. Both, ZnO and TiO2 blended, composite films are sensitive to ethanol. It can be concluded that metal oxide blending improves the preformance of sensor for ethanol detection. The response/recovery time and active sensing regions depend upon the concentration of metal oxide in host zeolite. The ZnO/ZSM-5 and TiO2/ZSM-5 composite films are the excellent ethanol sensors.
Ključne besede: ZSM-5 zeolite, composites, XRD, FTIR, ethanol sensing
Objavljeno: 26.06.2017; Ogledov: 863; Prenosov: 308
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Hormeza - primer odgovora astrocitov po izpostavljenosti etanolu
Metoda Lipnik-Štangelj, Lucija Šarc, 2012, izvirni znanstveni članek

Opis: Purpose: In the present work we describe hormesis and review documented hormetic responses in astroglial cells after exposure to different stressors. We present an example of the astrocyte response to acute and chronic ethanol exposure with hormetic characteristics. Methods: As an experimental model, newborn rat cortical astrocytes in culture were used. The cells were exposed to ethanol or the primary metabolite of ethanol (acetaldehyde) for 24 h or 7 days. After treatment, the protein content was determined, and the IL-6 levelsin the culture medium were measured using an enzymelinked immunoassay. Results: Treatment of astroglial cells with ethanol or acetaldehyde led to enhanced protein content and stimulated IL-6 production in the low concentration zone followed by diminished protein content and an inhibition ofIL-6 production at higher concentrations. Chronic exposure of astrocytes wasmore toxic than acute exposure for both compounds, and acetaldehyde was more toxic compared to ethanol. Conclusion: Ethanol and acetaldehyde representstressors for cultured astrocytes and evoke a typical hormetic response after acute and chronic exposure.
Ključne besede: hormesis, astrocytes, ethanol, acetaldehyde
Objavljeno: 30.12.2015; Ogledov: 1408; Prenosov: 35
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Improving the economic and environmental performances of the beet sugar industry in Slovenia: increasing fuel efficiency and using by-products for ethanol
Damjan Krajnc, Miro Mele, Peter Glavič, 2007, izvirni znanstveni članek

Opis: This paper investigates the possibilities of attaining zero-waste emissions inthe case of sugar production. The case-studied sugar plant located in Slovenia reflected a typical plant, using traditional sugar production from beet. An investigation of the possible use of waste and by-products from sugarprocessing was carried out, in order to approach zero-waste from beet sugar processing. The sugar production process was simulated and optimization was carried out concerning energy utilization. Consumption of energy in the chosen sugar plant was lowered by simultaneous optimization of the evaporationand crystallization process. Changing the fuel type used in the case-studied sugar plant (replacement of heavy fuel oil with natural gas) produced a significant decrease in air emission. Opportunities in the sugar industry have been discovered for adapting to new market conditions through the optimization of combined sugar-ethanol production. The two proposed options have been economically and environmentally evaluated and compared.
Ključne besede: kemična industrija, trajnostni razvoj, proizvodnja sladkorja, minimiranje porabe energije, evaporacija, etanol, chemical industries, sustainable development, sugar production, energy minimization, evaporation, ethanol, zero waste
Objavljeno: 01.06.2012; Ogledov: 1989; Prenosov: 79
URL Povezava na celotno besedilo

Vapor-liquid equilibrium of binary CO2-organic solvent systems (ethanol, tetrahydrofuran, ortho-xylene, meta-xylene, para-xylene)
Željko Knez, Mojca Škerget, Ljiljana Ilić, Christoph Lütge, 2008, izvirni znanstveni članek

Opis: High pressure vapor-liquid phase equilibrium data (P-T-x-y) for the binary mixtures of organic solvent (ethanol, tetrahydrofuran, o-xylene, m-xylene, p-xylene) with CO2 have been measured at temperatures 313.2, 333.2, 353.2 K and pressures from 1 to 14 MPa using a static-analytic method. For the systemsethanol-CO2 and tetrahydrofuran-CO2, the experimental data at 313.2 and333.2 K are in a good agreement with literature data. The experimental results have been correlated by the Peng-Robinson equation of state in combination with van der Waals one fluid mixing rule with two adjustable parameters.
Ključne besede: chemical processing, high pressure technology, carbon dioxide, ethanol, tetrahydrofuran, xylene, vapor-liquid equilibrium, experimental data, PR equation of state
Objavljeno: 01.06.2012; Ogledov: 1722; Prenosov: 105
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Volumetric properties of ethanol-water mixtures under high temperatures and pressures
Darja Pečar, Valter Doleček, 2005, izvirni znanstveni članek

Opis: The densities of ethanol and ethanol-water mixtures were measured with a vibrating tube densimeter at 25.0, 50.0 and 75.0°C in the pressure range from 0.10 to 40.00 MPa. Densities were correlated using an empirical model. Partial molar volumes, excess molar volumes, isothermal compressibilities, cubic expansion coefficients and internal pressures were calculated from obtained densities. This study reports the dependence of densities, partial molar volumes, excess molar volumes, isothermal compressibilities, cubic expansion coefficients and internal pressures on composition, temperature and pressure.
Ključne besede: ethanol, ethanol-water mixtures, density measurements, vibrating U tube densimeter, partial molar volumes, isothermal compressibility, isobaric expansibility, cubic expansion coefficient, internal pressure
Objavljeno: 01.06.2012; Ogledov: 1853; Prenosov: 75
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