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Register a new userThe Study of Fluid retention parameters in porous thin films by AFM
دراسة برامترات احتباس الموائع في سطوح الأغشية المسامية بمجهر القوة الذرية
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سهام الطرابيشي( باحث )
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تعرض الورقة دراسة بيانية لعينات من ZnS أغشية رقيقة من مبخرة حرارياً على ركائز من الزجاج و أخرى من السلكون بمجهر القوة الذرية. شملت هذه الدراسة كلاً من البرامترات الحجمية و البرامترات الوظيفية لسطوح هذه الأغشية بهدف إلقاء الضوء على إمكانية احتباس الموائع في هذه الأغشية. لإجراء هذه الدراسة سجلت منحنيات أبوت – فايرستون Abbott-Firestone Curve لهذه الأغشية التي تعتمد على توزع الأعماق في سطوحها، و قِيست هذه البرامترات في كامل عمق المسامات و تُعّقبتْ قيمها في شرائح متتالية من السطح باستخدام المؤثر thresholding operator الذي يسمح بقطع أعلى السطح أو أسفله أو كليهما عند مستوى (أو مستوين) للارتفاع و مقارنة هذه البرامترات بنتائج دراسة أخرى تعتمد على انتقاء شرائح بين المستوين.
We present in this paper a graphical study of regions of thermally deposited ZnS thin films on glass by atomic force microscope (AFM). This study consists of volume parameters and functional parameters of these films surfaces for the object of investigating the possibility to retain fluids by these films. For doing so, we registered Abbott-Firestone curves that are based on height distribution for these films, we measured volume and functional parameters in the whole pores. Using the thresholding operator we followed parameters distribution in depth of the surface. At the end we compared these parameters by the results of another study based on slice selection at different levels.
References used
Nicotera Isabella et al, Effective Improvement of Water-Retention in Nanocomposite Membranes Using Novel Organo-Modified Clays as Fillers for High Temperature PEMFCs, J. Phys. Chem. B, 2011, 115 (29), pp 9087– 9097
Enotiadis A. et al, Graphene-based nafion nanocomposite membranes: enhanced proton transport and water retention by novel organofunctionalized graphene oxide nanosheets. 2012 Nov 5;8(21):3338-49
Jeong Park Moon et al, Increased Water Retention in Polymer Electrolyte Membranes at Elevated Temperatures Assisted by Capillary Condensation Nano Lett., 2007, 7 (11), pp 3547–3552
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AFM has been used to get microscopic information of the surface structure
and to plot topographies representing the surface relief. AFM technique can be
used to visualize the surface relief, specify the growth of thin films, and
determine Height parameters.
الخشونة
التموج
جذر متوسط مربع الارتفاعات
العزم الإحصائي الثالث
الانحراف عن التناظر
العزم الإحصائي الرابع
وصف التفلطح
المتوسط الحسابي للارتفاعات
كثافة القمم
المتوسط الحسابي لانحناءات القمم
(Roughness (R
(Waviness (W
(Root Mean Square height (RMS
Surface Skewness
Surface Kurtosis
Arithmetical mean height
Density of peaks and Arithmetic mean peak curvature
المزيد..
In this paper we present a study of ZnS thin films thermally deposited on
glass substrates, with different optical thicknesses. On topography micrographs
and feature parameters obtained by Atomic Force Microscope, we pursued the
islands formation
and growing in ZnS thin films even on the same optical
thickness of the film. For doing so, we analyzed the micrographs surface, using
Watershed Segmentation and Wolf pruning that allow the detection of
significant features on surfaces, Grain sorting operator and Parameter
Distribution Study.
The oil reservoirs exploitation processes are one of very important
steps of petroleum industry. The rentability of investor reservoir is
related to correct planning and accurate understanding of rock
properties and liquids flow in porous media. T
he complexity of
porous media contains hydrocarbon materials, with phases changes related to thermo-physiochemical phenomena, make the classical methods used to study the reservoir recovery are inaccurate and insufficient to predict the performance and behavior of reservoir.
Recently, simulation and modeling are used to decrease the risks in the decision of the optimal recovery method, and achieve the best possible rentability. This method provides predictive capacity help us to better understanding of reservoir. By the suitable input data, we can solve the calibrated mathematical model analytically or numerically. We present in this research the formulation of
mathematical model of isotropic-one dimension reservoir with
single phase fluid flow. The numerical solution, the application of
this model, and the mechanism of pressure diffusivity along
productive formation, will be presented to simulate a reservoir with injection and production wells.
In the present paper, we discuss the influence of point defects on electrical and
optical characteristics of ZnO thin films grown by the atomic layer deposition (ALD)
method on glass and silicon substrates at low temperature (100°C). Room temperatu
re
photoluminescence (RT PL) spectra, secondary ion mass spectroscopy (SIMS), and Hall
Effect measurements were made for as-grown ZnO layers. The annealing process was
performed in air as well as in N2 atmosphere at 400°C for half an hour. The long annealing
resulted in a larger reduction in electron concentration. Simultaneously, an evident
increase in carrier's mobility was observed, which may suggest that annealing resulted in a
decreased number of native defects in the ZnO layers. Also, it was observed that hydrogen
atoms in ZnO samples did not dominate their electrical properties with the increase of
electrons concentration.
Mn doped tin oxide transparent conducting thin films were deposited at a
substrate temperature of 450°C by spray pyrolysis method. Structural
properties of the films were investigated as a function of various Mn-doping
levels (0, 1, 3, 5, 7 wt%) w
hile all other deposition parameters such as
substrate temperature, spray rate, carrier gas pressure and distance between
spray nozzle to substrate were kept constant.
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