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RISS 인기검색어
- 검색키워드
- 저자 : Hadi Savaloni (검색결과 4 건)
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Hadi Savaloni,Rojan Savari,Salar Abbasi 한국물리학회 2018 Current Applied Physics Vol.18 No.8
The photolitography method was used for producing interdigitated configurations for cathode and anode electrodes of a field ionization gas sensor in which Mn helical nano-flowers with 3-fold symmetry were deposited using oblique angle deposition together with rotation of the substrate about its surface normal, with each rotation divided into six sections. These sections were alternately rotated at high and low speeds. Three different distances were chosen in the design between anode and cathode electrodes, namely 40, 100 and 200 μm. Physical structure and morphology of electrodes were studied by field emission scanning electron microscope and atomic force microscope analyses. The breakdown voltage of the system was studied for nitrogen, oxygen, argon, air and carbon mono-oxide gases. Investigations with these gases at different distances between anode and cathode and different gas pressures confirmed Paschen's Law. Results showed that at low pressures, decreasing the gap between electrodes increases the breakdown voltage. With fewer gas molecules between the electrodes the number of interactions between particles is reduced and higher energies are required for ionization of gas molecules. At high pressures, the breakdown voltage is decreased because of an increased number of molecular interactions. The sensor demonstrated good selectivity between the different gases and selectivity was enhanced with increasing gas pressure. A direct relationship was found at low pressures (e.g., 0.1 mbar) between the breakdown voltage and the gas ionization energy while at high pressures (e.g., 1000 mbar) this relationship was reversed.
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Design and engineering of sculptured nano-structures for application in hydrophobicity
Somaye Hosseini,Hadi Savaloni,Mehran Gholipour Shahraki 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.45 No.-
The design and engineering of suitable structures for enhancement of the hydrophobic property of asurface is one of the most challenging problems. In order to achieve a superhydrophobic structure wehave designed and fabricated Mn nano-sculptured thinfilms with different shapes and dimensions,namely helical squares and helical pentagons on glass substrates. The contact angle (CA) of three liquids;a–bromonaphtalene (apolar), water and formamide (polar) to these surfaces was measured and thesurface free energy was calculated. Changes to the geometry of the structure produced results rangingfrom hydrophilic (CA = 51 ) to superhydrophobic (CA = 152 ). The superhydrophobic structure is a helicalsquare shaped structure with high porosity (deposited at 83 ) which also shows the rose petal effect withthe additional property of high adhesion. The resemblance of this structure to that of gecko feet, whichshows both high adhesion forces and superhydrophobic property is discussed. All structures investigatedin this work showed negative spreading coefficients with highest values for the largest contact angle foreach type/shape of structure. The superhydrophobic sample also acts as a sticky surface which isconfirmed by hysteresis of the contact angle obtained from advancing and receding contact anglesmeasurements. The influence of the volume of liquid drop and different surface morphologies on thewetting transition from Cassie–Baxter to Wenzel states is also reported.
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Helma Sadat Bahari,Hadi Savaloni 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.11
In this work we report attempts to inhibit corrosion of Cu substrates in 0.6 M NaCl solution by coating with 100 nm Ni filmand post-annealing with oxygen at different temperatures, in order to convert the nickel to nickel oxide. Electrochemicalimpedance spectroscopy (EIS) and polarization measurement analyses were used to obtain electrochemical data. The correctnessof the EIS results was confirmed by Kramers–Kronig transformation, while fitting of the data (Nyquist and Bodediagrams) to suitable equivalent electrical circuits showed that the highest corrosion enhancement is achieved for the Ni/Cusample annealed at 473 K, resulting in a 98% corrosion inhibition enhancement factor (η%). Polarization measurements alsoshowed that this sample has the lowest corrosion current density, lowest corrosion rate and highest corrosion potential witha 97% corrosion inhibition efficiency factor (PE%). Consistent results are achieved for EIS and polarization measurementswhich are then correlated with the nanostructure of the films using X-ray diffraction and atomic force microscope analyses.
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Stefan Talu,Miroslaw Bramowicz,Slawomir Kulesza,Atefeh Ghaderi,Hadi Savaloni,Reza Babaei,Shahram Solaymani 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.43 No.-
This study presents research into the three-dimensional (3-D) surface texture of silver chiralnanoflowers with three-, four- and five-folds spatial symmetry, which were produced using obliqueangle deposition method with rotating sample holder. X-ray diffraction (XRD), atomic force microscopy(AFM), and field-emission scanning electron microscopy (FESEM) measurements were carried out inorder to study 3-D morphology and structure of the samples at the nanoscale. Obtained results werefound to provide an insight into important relationships between the structure of prepared nanoflowersand their properties. Results presented in the paper proved the usefulness of the method for preparationof high-quality, sculptured 3-D nanostructures with pre-designed shapes (with narrower and longerpetals) and desired porosity. Specific structure, shape, and length scale of the 3-D deposits can be thenverified in simulations for quick characterization of the samples. This analysis helps to understand theirfunctional role in the test surface, in order to evaluate the relation among the 3-D microtextured surface.
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