Interaction between Fish Skin Gelatin and Pea Protein at Air-Water Interface after Ultrasound Treatment

The interaction between fish skin gelatin (FG) and pea protein isolate (PPI) was investigated at the air-water interface (A-W) before and after a high intensity (275 W, 5 min) ultrasound treatment (US). We analyzed the properties of the single protein suspensions as well as an equal ratio of FG:PPI (MIX), in terms of ζ-potential, particle size, molecular weight, bulk viscosity and interfacial tension. The foaming properties were then evaluated by visual analysis and by Turbiscan Tower. Confocal laser scanning microscopy (CLSM) was employed to explore the role of the proteins on the microstructure of foams. The results showed that the ultrasound treatment slightly influenced physicochemical properties of the proteins, while in general, did not significantly affect their behavior both in bulk and at the air-water interface. In particular, PPI aggregate size was reduced (−48 nm) while their negative charges were increased (−1 mV) after the treatment. However, when the proteins were combined, higher molecular weight of aggregates, higher foam stability values (+14%) and lower interfacial tension (IFT) values (47.2 ± 0.2 mN/m) were obtained, leading us to assume that a weak interaction was developed between them

Strain relaxation in GaN/Al0.1Ga0.9N superlattices for mid-infrared intersubband absorption

International audienceWe have studied the strain relaxation in GaN/Al0.1Ga0.9N superlattices grown by plasma-assisted molecular-beam epitaxy on different buffer layers. A periodic relaxation detected in situ was identified as an elastic phenomenon related to the stress induced by the Ga excess adlayer. Plastic relaxation results in an increase of the density of type a dislocations, which is minimum in the case of growth on GaN. There is no evidence of stacking fault formation or crack propagation in any of the samples. (C) 2010 Elsevier B.V. All rights reserved

Stability of High Temperature Chemical Vapor Deposited Silicon Based Structures on Metals for Solar Conversion.

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Effect of doping on the mid-infrared intersubband absorption in GaN/AlGaN superlattices grown on Si(111) templates

International audienceWe report on the effect of Si doping on the mid-infrared intersubband absorption in GaN/AlGaN superlattices. For increasing doping levels, interband luminescence displays a blueshift and a broadening of the band edge caused by the screening of the internal electric field and band-filling effects. The intersubband absorption energy is mainly governed by many-body effects like exchange interaction and depolarization shift, which increase the e(1)-e(2) subband separation. The ISB blueshift induced by many-body effects can be more than 50% of the e(1)-e(2) transition energy

Interaction between fish skin gelatin and pea protein at air-water Interface after ultrasound treatment

The interaction between fish skin gelatin (FG) and pea protein isolate (PPI) was investigated at the air-water interface (A-W) before and after a high intensity (275 W, 5 min) ultrasound treatment (US). We analyzed the properties of the single protein suspensions as well as an equal ratio of FG:PPI (MIX), in terms of zeta-potential, particle size, molecular weight, bulk viscosity and interfacial tension. The foaming properties were then evaluated by visual analysis and by Turbiscan Tower. Confocal laser scanning microscopy (CLSM) was employed to explore the role of the proteins on the microstructure of foams. The results showed that the ultrasound treatment slightly influenced physicochemical properties of the proteins, while in general, did not significantly affect their behavior both in bulk and at the air-water interface. In particular, PPI aggregate size was reduced (-48 nm) while their negative charges were increased (-1 mV) after the treatment. However, when the proteins were combined, higher molecular weight of aggregates, higher foam stability values (+14%) and lower interfacial tension (IFT) values (47.2 +/- 0.2 mN/m) were obtained, leading us to assume that a weak interaction was developed between them