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In this work, the plastic of polylatic acid(PLA) film is coated by alumina(Al_2O_3)through dielectric barrier discharge plasma assisted atomic layer deposition(DBD PA-ALD) for the proposal of the barrier property enhancement. The influence of ALD Al_2O_3 thickness on properties of barrier, mechanical, optical and degradation is investigated in detail. It is obtained that the growth rate of Al_2O_3 in DBD PA-ALD is as quick as 0.12 nm/cycle. After coated~40 nm Al_2O_3, the water vapor transmission rate of PLA is reduced by two orders of magnitude.Additionally, it is noticed that the tension strength of the coated film is improved slightly,whereas the light transmission rate is decreased with the increase of Al_2O_3 thickness. The degradation test shows that Al_2O_3 coating almost does not affect the self-degradation rate of PLA film. 相似文献
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Diffusing behavior of MoO3 on Al2O3 and SiO2 thin films 总被引:1,自引:0,他引:1
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Syed Mansoor Ali M.S.Algarawi Turki S.ALKhuraiji S.S.Alghamdi Muhammad Hammad Aziz M.Isa 《核技术(英文版)》2018,(7)
The effect of gamma irradiation with different doses(25–75 kGy) on TiO_2 thin films deposited by atomic layer deposition has been studied and characterized by X-ray diffraction(XRD),photoluminescence measurements,ultraviolet–visible(UV–Vis) spectroscopy,and impedance measurements.The XRD results for the TiO_2 films indicate an enhancement of crystallization after irradiation,which can be clearly observed from the increase in the peak intensities upon increasing the gamma irradiation doses.The UV–Vis spectra demonstrate a decrease in transmittance,and the band gap of the TiO_2 thin films decreases with an increase in the gamma irradiation doses.The Nyquist plots reveal that the overall charge-transfer resistance increases upon increasing the gamma irradiation doses.The equivalent circuit,series resistance,contact resistance,and interface capacitance are measured by simulation using Z-view software.The present work demonstrates that gamma irradiation-induced defects play a major role in the modification of thestructural,electrical,and optical properties of the TiO_2 thin films. 相似文献
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利用离子束辅助沉积的方法在CK45号钢和AlTi合金基体上制备了具有不同厚度Al层或Al2O3层的Al/Al2O3双层膜系统,Al与Al2O3层之间是厚度为100nm的梯度界面层,利用电化学方法测量了样品在近中性水溶液中耐腐蚀性能,实验中还测量了样品的表面硬度和耐摩擦性能,研究了双层膜系统中Al或Al2O3层厚度变化对样品物理性质和化学性质的影响。 相似文献
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采用液体成膜法制备了Al2O3:C光致荧光剂量计(OSLD),开展了剂量学性能的初步研究。退火后本底为0.03 mGy,均匀性优于2%,在0.02 mGy~10 Gy测量范围内具有良好线性响应,线性相关系数R2=0.999 6,对β、γ射线响应系数差异约10%,对中子响应系数约为β、γ射线的4%~7%,剂量计多次测量响应信号无明显衰减,照后两个月响应变化为5%,可用于一定周期内剂量存档、复测。上述结果表明,液体成膜方法制备的OSLD具有良好的剂量学性能,证明该方法可行。 相似文献
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实验研究在强冲击波作用下各种材料的状态方程,对于武器设计、新材料科学、地球和行星内部的地球物理学研究等研究领域都有非常重要的理论意义和广泛的应用前景。随着强激光技术的发展,实验室利用强激光产生稳定冲击波研究物质的状态方程已经实现。激光速度干涉仪已成为1个被普遍接受的测量自由面速度的诊断设备,可直接记录靶自由面速度随时间的变化。根据实验要求建立了光学记录速度干涉仪系统(图1),用以进行状态方程自由面速度数据的直接测量。 相似文献
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The pulsed corona discharge (CD) generated in contact with water and directly in water, and high-power air plasma jet (APJ) were studied for production of plasma activated water (PAW). The changes of physical (pH, redox potential, conductivity, temperature) and chemical (peroxides, nitrites, nitrates concentrations) properties of treated water were investigated. The comparison of CD generated in gas/water interface and underwater configuration in the same system showed that the interaction of reactive oxygen and nitrogen species formed in ambient air in gas/water system induces different chemical processes, leading to lower pH, higher oxidation-reduction potential (ORP) and higher conductivity of PAW than in underwater discharge. High yield of peroxide was observed in both configurations. The PAW prepared by APJ exhibits high concentration of nitrites and nitrates according to supplied energy, and related significant decrease of pH and increase of ORP and conductivity after treatment. The antimicrobial effect of PAW prepared by CD and plasma jet on lentils sprouts was studied in different treatment and washing times. The APJ appears to have great efficacy on water activation resulted in strong decontamination effect. The PAW treated by APJ for 10 min led to bacterial reduction from initial 8.3 to 5.9 and 4.0 log10 CFU g−1 after 10 and 30 min of washing, respectively. 相似文献
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The physical vapor deposition method is an effective way to deposit Al2O3 and Er2O3 on 316L stainless steel substrates acting as tritium permeation barriers in a fusion reactor.The distribution of residual thermal stress is calculated both in Al2O3 and Er2O3 coating systems with planar and rough substrates using finite element analysis.The parameters influencing the thermal stress in the sputter process are analyzed,such as coating and substrate properties,temperature and Young's modulus.This work shows that the thermal stress in Al2O3 and Er2O3 coating systems exhibit a linear relationship with substrate thickness,temperature and Young's modulus.However,this relationship is inversed with coating thickness.In addition,the rough substrate surface can increase the thermal stress in the process of coating deposition.The adhesive strength between the coating and the substrate is evaluated by the shear stress.Due to the higher compressive shear stress,the Al2O3 coating has a better adhesive strength with a 316L stainless steel substrate than the Er2O3 coating.Furthermore,the analysis shows that it is a useful way to improve adhesive strength with increasing interface roughness. 相似文献
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添加Al2O3和SiO2的大晶粒UO2芯块制备研究 总被引:2,自引:0,他引:2
研究了Al2O3和SiO2添加剂对UO2芯块晶粒尺寸的影响.结果表明:加入少量的Al2O3和SiO2,可有效促进烧结过程中UO2芯块的晶粒度长大,过量加入则会阻碍烧结过程中UO2芯块的致密化;在添加量一定的情况下,添加不同比例的Al2O3和SiO2,对芯块晶粒尺寸有较大影响,只添加SiO2,对芯块晶粒尺寸影响不大,Al2O3添加量增加,芯块晶粒尺寸随之增加;添加Al2O3和SiO2促进UO2芯块晶粒长大的机制是在烧结期间发生了液相烧结. 相似文献
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Vukoman JOKANOVI Boana OLOVI Anka TRAJKOVSKA PETKOSKA Ana MRAKOVI Bojan JOKANOVI Milo NENADOVI Manuela FERRARA Ilija NASOV 《等离子体科学和技术》2017,19(12)
Structural and optical properties of nanometric titanium oxide(TixOy) films obtained by cathodic arc plasma deposition were investigated. Phase analysis by x-ray diffraction and Fouriertransform infrared spectroscopy showed the presence of anatase, rutile, Ti_2O_3, Ti_4O_7 and amorphous phases. Scanning electron microscopy images showed well-developed surface morphology with nano-patterns. Spectroscopic ellipsometry revealed film thicknesses of 53 and50 nm, variable refractive indices dependent on the light wavelength and close to zero extinction coefficients for wavelengths higher than 500 nm. On the basis of ultraviolet–visible spectroscopy data and using the Tauc equation, band gap values for direct and indirect electron transitions were determined. 相似文献
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《Journal of Nuclear Materials》1987,150(2):182-185
Volume change of Al2O3 and MgAl2O4 induced by irradiation with 14-MeV neutrons at 50°C has been measured. It is shown that the volume change of A12O3 is anisotropic and is larger than that of MgAl2O4 about a factor of five. The result for MgAl2O4 is compared with that of fission neutron irradiation. 相似文献
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Gd2O3-UO2可燃毒物燃料是近年来核电站采用较为普遍的可燃毒物之一。传统观点认为在芯块制造过程中添加U3O8粉末会降低芯块的烧结密度.本文研究了在Gd2O3-UO2芯块基体密度-94%T.D的基础上.添加不同品比例由AUC煅烧得到的U3O8粉末,经成型,H2/H2O气氛中1750℃烧结后表明.随着U3O8加入量的增加,芯块的密度也随之增加,U3O8添加量大于40wt%时芯块的密度达到-97%T.D.,U3O8的加入相当于起到了助烧剂的作用.这一现象和传统的U3O8降低芯块密度的观点正好相反.而芯块的平均晶粒尺寸-8μm。 相似文献
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不同粒子在硅中能量沉积的计算及比较 总被引:2,自引:0,他引:2
在粒子与物理相互作用的理论基础上,编写了计算中子非电离能量损失(NIEL)和电离能量损失(IEL)以及电子和γNIEL的Monte Carlo计算程序,利用编写的程序以及TRIM95和SANDYL程序计算了1MeV中子、20MeV以下电子和γ在硅中IEL和NIEL的大小和分布。对计算结果进行了分析和比较。 相似文献
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Toyohiko Yano Hiroshi Konishi Saishun Yamazaki Mohd Idzat bin Idris Katsumi Yoshida 《Journal of Nuclear Science and Technology》2017,54(8):891-898
SiC fiber-reinforced SiC matrix composites (SiCf/SiC) are considered as one of the candidates for blanket materials in future fusion reactors and as an advanced fuel cladding material for next-generation fission reactors. Generally, the densification of SiC needs sintering additives and oxides such as Al2O3, Y2O3, and yttrium-aluminum garnet (YAG, Y3Al5O12), which are frequently added to SiC. However, the effects of neutron irradiation on sintering additives are still unclear. In this study, we performed the neutron irradiation of Al2O3, Y2O3, and YAG at fluences up to 2.0–2.5 × 1024 n/m2 (E > 0.1 MeV) at 60–90 °C. The isochronal recovery of the macroscopic volume of Al2O3 against annealing temperature showed smooth and continuous shrinkage at a temperature of up to 1200 °C, and the volume slightly increased above that temperature. In contrast, the volume of Y2O3 showed quick shrinkage at the low temperature range, and slower and smooth recovery was observed up to ~1100 °C. In the case of YAG, the recovery of volume occurred in a step-wise manner at 600–750 °C, and continuous shrinkage occurred at temperatures lower and higher than that temperature range. The activation energies for the macroscopic volume recoveries of three oxides were obtained from the Arrhenius plots of the rate coefficients. Two-stage recovery was observed for Al2O3, whereas more complicated recovery processes were suggested for Y2O3 and YAG. 相似文献
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MeV辐射场中Al2O3的剂量学特性 总被引:1,自引:1,他引:0
用EGSnrc/DOSRZnrc程序计算水体模中Al2O3剂量计的吸收剂量和剂量计所在处介质的实际吸收剂量,并计算吸收剂量换算因子。剂量计为φ4mm×1 mm的Al2O3薄片,计算深度0.5~8 cm,入射光子能量1~18MeV,入射电子能量1~25 MeV。结果表明:1)吸收剂量换算因子的大小与入射粒子的能量以及剂量计在体模中的深度有关;2)存在一个吸收剂量换算因子变化不敏感的区域,在此区域内吸收剂量换算因子受剂量计深度变化和入射粒子能量变化的影响都很小,可直接用平均值来表示区域内的吸收剂量换算因子。 相似文献