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A kinetic model.for Describing the Effect of Proteins on the Air-Water Interface Tension

Journal of Food Science and Engineering 2014年第6期4卷 282-290页

作者： Luis Alberto Panizzolo Luis Eduardo Mussio Maria Cristina Anon Departamento de Ciencia y Tecnologia de Alimentos Facultad de Quimica Universidad de la Republica Av. Gral. Flores 2124Montevideo11800 Uruguay International Organization of Legal Metrology. 11 Rue Turgot Paris 75009 France Centro de Investigacion y Desarrollo en Criotecnologia de Alimentos (CIDCA) CONICET Facultad de Ciencias Exactas Universidad Naeional de La Plata Calle 47y 116 La Plata 1900 Argentina

The main objective of this work was to develop a kinetic model.to describe the variation of the surface tension in an air-water interface due to the adsorption of proteins from different origins and to identify quantitatively the relevant parameters, it was considered that the processes of adsorption, unfolding and reordering of the protein molecule in the interface occur simultaneously. The model.used in the present work to calculate the surface tension postulates the existence of two simultaneous processes, adsorption and protein rearrangement represented with an equation of first order with two exponential components. The relevant parameter of the equation are ka and kr-the rate constants of the two first order kinetic phases that correspond to both conformational states of the protein, adsorption and rearrangement during the process of variation of the surface tension, and the amplitude parameters Aa and Ar. The results suggest that the kinetic model.for the variation of the surface tension of protein solutions proposed in this work, with two simultaneous first order processes, is more appropriate than previous model. to describe such variation.

关键词： Interface tension proteins kinetic model.

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Investigation of Structural, Rheological and Thermal Properties of PMMA/ONi-Al LDH Nanocomposites Synthesized via Solvent Blending Method: Effect of LDH Loading

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Chinese Journal of Polymer Science 2016年第6期34卷 739-754页

作者： Samarshi Chakraborty Manish Kumar Kelothu Suresh G.Pugazhenthi Department of Chemical Engineering Indian Institute of Technology Guwahati

This article addresses the synthesis of organically tailored Ni-A1 layered double hydroxide （ONi-A1 LDH） and its use in the fabrication of exfoliated poly（methyl methacrylate）（PMMA） nanocomposites. The pristine Ni-AI LDH was initially synthesized by co-precipitation method and subsequently modified using sodium dodecyl sulfate to obtain ONi-A1 LDH. Nanocomposites of PMMA containing various amounts of modified Ni-A1 LDH （3 wt%-7 wt%） were synthesized via solvent blending method to investigate the influence of LDH content on the properties of PMMA matrix. Several characterization methods such as X-ray diffraction （XRD）, transmission electron microscopy （TEM）, Fourier transform infrared spectroscopy （FTIR）, rheological analysis, differential scanning calorimetry （DSC） and thermo gravimetric analysis （TGA）, were employed to examine the structural, viscoelastic and thermal properties of PMMA/OLDH nanocomposites. The results of XRD and TEM examination confirm the formation of partially exfoliated PMMA/OLDH nanocomposites. The FTIR results elucidate that the characteristic bands for both pure PMMA and modified LDH are present in the spectra of PMMA/OLDH nanocomposites. Rheological analyses were carried out to examine the adhesion between polymer matrix and fillers present in the nanocomposite sample. The TGA data indicate that the PMMA nanocomposites exhibit higher thermal stability when compared to pure PMMA. The thermal decomposition temperature of PMMA/OLDH nanocomposites increases by 28 K compared to that of pure PMMA at 15% weight loss as a point of reference. In comparison with pure PMMA, the PMMA nanocomposite containing 7 wt% LDH demonstrates improved glass transition temperature （Tg） of around 3 K. The activation energy （Ea）, reaction orders （n） and reaction mechanism of thermal degradation of PMMA/OLDH nanocomposites were evaluated using different kinetic model.. Water uptake capacity of the PMMA/OLDH nanocomposites is less than that of the pure PMMA.

关键词： Ni-A1 LDH PMMA XRD FTIR TGA kinetic model.

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Selective Catalytic Oxidation Catalyst for Removal of Ammonia from Biomass Gasification Gas. Part 2. Reaction kinetic Behavior Study

Selective Catalytic Oxidation Catalyst for Removal of Ammoni...

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第八届海峡两岸气溶胶技术研讨会暨第三届空气污染技术研讨...

作者： Chang-Mao Hung Department of Vehicle Engineering Yung-Ta Institute of Technology and Commerce 316 Chung-Shan Road Linlo Pingtung 909 Taiwan.

Ammonia （NH3） is widely found in industrial processes and it is a valuable chemical product for using with a variety of purposes and its can be eliminated in several ways, including ammonium nitrate production industry, livestock feedlots, urea manufacture plants, nitrogen fertilizer application industry, biomass combustion or petroleum refineries, and refrigeration industry, which are either toxic inorganic gaseous and its pungent malodorous component under ambient conditions or have the potential harmful effects on the public. More recently, catalytic oxidation has been known to enhance the possibilities of the advanced oxidation processes technology through the use of dedicated catalysts, which can potentially promote oxidation in shorter reaction times under milder operating conditions. The selective catalytic oxidation （SCO） for ammonia-containing stream to molecular nitrogen and water is one way to solve ammonia pollution problems. Moreover, the kinetic behavior of NH3 oxidation with catalysis can be accounted by using the rate expression of the kinetic model. kinetic parameters are also developed on the basis of the differential reactor data in this study. Figure 1 presents the textural characteristics by STEM- EDX of the cordierite catalyst. Morphology of the catalysts with STEM, combined with EDX analysis, indicates that nanometal composite were well dispersed on the cordierite support surface overall. To further identify the chemical properties of the PtPdRh cordierite catalyst, Figure 2 presents UV-Vis spectra and thus provides further information on the states of platinum and rhodium species in these catalysts. The bands associated with such octahedral platinum （IV） species were observed in the ranges 325-350 nm. The band at 325-350 nm corresponds to d-d transitions. No rhodium-containing species are detected by UV-Vis. These results indicate that rhodium may exist in a highly dispersed form. Moreover, a kinetic rate expression was developed to describe

关键词： Ammonia Biomass PtPdRh Cordierite Catalyst kinetic model.

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