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Michael G. Kontominas - One of the best experts on this subject based on the ideXlab platform.

  • thermal mechanical and permeation properties of gamma irradiated Multilayer food packaging films containing a buried layer of recycled low density polyethylene
    Radiation Physics and Chemistry, 2006
    Co-Authors: Stavroula Chytiri, Kyriakos A Riganakos, Antonios E. Goulas, Michael G. Kontominas
    Abstract:

    Abstract The effect of gamma radiation (doses 5–60 kGy) on the thermal, mechanical and permeation properties, as well as on IR-spectra of experimental five-layer food packaging films were studied. Films contained a middle buried layer of recycled low-density polyethylene (LDPE) comprising 25–50% by weight of the Multilayer Structure. Representative films containing 100% virgin LDPE as the buried layer were taken as controls. Results showed that the percentage of recycled LDPE in the Multilayer Structure did not significantly ( p 0.05 ) affect the melting temperature, tensile strength, percent elongation at break, Young's modulus, oxygen, carbon dioxide and water vapour transmission rate values and the IR-spectra of the non-irradiated and irradiated Multilayer films. Irradiation (mainly the higher dose of 60 kGy) induced certain small, but statistically significant ( p 0.05 ) differences in the mechanical properties of Multilayer films (with or without recycled LDPE layer) while no significant differences were observed in the thermal properties and in the gas and water vapour permeability of Multilayer films. The above findings are discussed in relation to the good quality of the pre-consumer scrap used in the present study.

  • physicochemical and mechanical properties of experimental coextruded food packaging films containing a buried layer of recycled low density polyethylene
    Journal of Agricultural and Food Chemistry, 2003
    Co-Authors: Anastasia Badeka, Antonios E. Goulas, And Antigoni Adamantiadi, Michael G. Kontominas
    Abstract:

    Migrational, permeation, and tensile properties of experimental five- and eight-layer coextruded and laminated films containing a middle buried layer of recycled low-density polyethylene (LDPE) comprising 40-50% bw of the Multilayer Structure were determined. Respective films containing 100% virgin LDPE as the buried layer were taken as controls. Results showed that the percentage of recycled LDPE in the Multilayer Structure did not affect overall migration values to distilled water, 3% acetic acid, and iso-octane. In all cases, overall migration values were lower than the upper acceptable limit (10 mg/dm 2 ) set by the European Union. Transmission rate values to O 2 , CO 2 , and water vapor were also not affected by the percentage of recycled LDPE in the Multilayer Structure. On the basis of O 2 transmission rates, low-barrier, barrier, and high-barrier Multilayer Structures were produced. Likewise, tensile properties (tensile strength, percent elongation at break, and Young's modulus) were not affected by the percentage of recycled material in the Multilayer Structure. Finally, all experimental films produced no adverse effects in taste or odor of the food-contacting phase tested. The above findings are discussed in relation to the high quality of the primary LDPE scrap used throughout this work in combination with the functional barrier hypothesis. On the basis of the present results it is proposed that primary LDPE scrap may be used as a middle layer comprising 40-50% bw of Multilayer food-packaging films without any compromise in migrational, barrier, mechanical, and organoleptic properties.

Jingting Luo - One of the best experts on this subject based on the ideXlab platform.

  • investigation of rayleigh wave and love wave modes in 112 0 zno film based Multilayer Structure
    Surface & Coatings Technology, 2019
    Co-Authors: Aojie Quan, Xiaoming Fan, Jingting Luo
    Abstract:

    Abstract Piezoelectric ZnO film-based Multilayer Structures with versatile surface acoustic wave (SAW) modes are promising for use in the cutting-edge lab-on-chip-level bio-sensing applications which are desired to integrate sensing and microfluidics functions on the same miniature chip. This paper investigates a Multilayer Structure of SiO2/ZnO 11 2 ¯ 0 /r-sapphire with the feasibility of Rayleigh and Love wave modes along the two orthogonal directions. Theoretical calculations are performed to analyze different SAW modes and to optimize the Structure parameters accordingly. ZnO is prepared by magnetron sputtering and its optimal fabrication parameters of sputtering pressure of 0.2 Pa, pure oxygen ambient gas and substrate temperature (500 °C) are determined towards the preferred 11 2 ¯ 0 orientation. The crystallographic characteristics and surface morphology of the fabricated ZnO film are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The surface vibration trajectory of the two modes both are measured using a laser vibrometer. It is verified the SAW mode parallel to the c-axis (0002) is a Rayleigh wave while that along 1 1 ¯ 00 is an SH-SAW/Love wave. As the SAWs encounter a PDMS cell filled with water on the film surface, the Love wave shows an insignificant acoustic damping of less than 2 dB and a reliable transmission response is maintained. In contrast, the acoustic energy of the Rayleigh wave based devices mostly radiates into liquid accompanied by an insertion loss of 13 dB and leading to obvious streaming.

  • shear horizontal surface acoustic wave characteristics of a 110 zno sio 2 si Multilayer Structure
    Journal of Alloys and Compounds, 2017
    Co-Authors: Jingting Luo, Aojie Quan
    Abstract:

    Abstract Shear-horizontal (SH) surface acoustic wave (SAW) propagation characteristics in IDT/(110)ZnO/SiO 2 /Si Multilayered Structure were theoretically investigated using 3-dimensions (3D) finite element analysis (FEA). X-ray diffraction result shows that the prepared ZnO films have preferred (110) orientation with its c -axis parallel to the substrate. 3D FEA results and the out of plane vibration experiment confirmed that SH-SAW was successfully excited in the Multilayered Structure. The phase velocities V p , electromechanical coupling coefficients K 2 , and temperature coefficient of frequency (TCF) dispersion properties of mode 0 were studied considering various thicknesses of ZnO and SiO 2 thin films, which were verified by experiments. SiO 2 film with a positive TCF not only compensate the negative TCF of the (110) ZnO but also enhance the K 2 . A large K 2 of 3.37 and nearly zero TCF of −0.1 ppm/°C was achieved in SH-SAW device based on IDT/(110)ZnO(2 μm)/SiO 2 (1 μm)/Si Multilayer Structure, which is promising for high sensitive and temperature stable bio-sensing application.

  • a new type of glucose biosensor based on surface acoustic wave resonator using mn doped zno Multilayer Structure
    Biosensors and Bioelectronics, 2013
    Co-Authors: Jingting Luo, Pingxiang Luo, Min Xie, Bixia Zhao, Feng Pan, Ping Fan, F Zeng, Dongping Zhang, Zhuanghao Zheng, Guangxing Liang
    Abstract:

    This work reports a high-performance Mn-doped ZnO Multilayer Structure Love mode surface acoustic wave (SAW) biosensor for the detection of blood sugar. The biosensor was functionalized via immobilizing glucose oxidase onto a pH-sensitive polymer which was attached on Mn-doped ZnO biosensor. The fabricated SAW glucose biosensor is highly sensitive, accurate and fast with good anti-interference. The sensitivity of the SAW glucose biosensor is 7.184 MHz/mM and the accuracy is 6.96 × 10(-3)mM, which is sensitive and accurate enough for glucose monitoring. A good degree of reversibility and stability of the glucose sensor is also demonstrated, which keeps a constant differential frequency shift up to 32 days. Concerning the time response to human serum, the glucose sensor shows a value of 4.6 ± 0.4 min when increasing glucose concentrations and 7.1 ± 0.6 min when decreasing, which is less than 10 min and reach the fast response requirement for medical applications. The Mn-doped ZnO Love mode SAW biosensor can be fully integrated with CMOS Si chips and developed as a portable, passive and wireless real time detection system for blood sugar monitoring in human serum.

C. Garcia - One of the best experts on this subject based on the ideXlab platform.

R. Morales - One of the best experts on this subject based on the ideXlab platform.

Johan Akerman - One of the best experts on this subject based on the ideXlab platform.