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The relationship between temperature and olive oil CA on fabricated Ag-doped ZnO nanorods on an SS-400 substrate.
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A simple fabrication technique is described for preparing Ag-doped ZnO nanorods using a rapid hydrothermal technique to create a superamphiphilic surface on SS-400 substrates. The high roughness resulting from Ag-doped ZnO nanorod surfaces is responsible for generating the superamphiphilic property of the SS-400 substrate. The fabricated surface sh...
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... the superamphiphilic property of the heated surfaces was checked by measuring the CAs with water and olive oil. As shown in Figure 3, there was no evident change in the olive oil CA values on the fabricated SS-400 substrate modified with Ag-doped ZnO nanorods, and the surfaces still showed excellent superoleophilic properties. The fabricated superamphiphilic surfaces had many practical and industrial applications. ...
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Citations
... Pt, Au, Ag, and Pd) in gas-sensing materials. [25][26][27][28] However, the gas performance of the ZnO structure with Co content has seldom been explored. As a comparatively inexpensive noble metal, Co 2+ ion is a potential candidate that can be successfully doped and is compatible with Zn 2+ ion. ...
In this investigation, gas sensors based on zinc oxide (ZnO) nanorods (NRs) with Co concentration were successfully fabricated and explored. A 100 nm-thick ZnO film was deposited as a seed layer onto Corning glass substrate via radio frequency (RF) magnetron sputtering technique. Then, Co-doped ZnO (CZO) NR arrays were grown by using a simple chemical bath deposition (CBD) method at 95 °C for 3 h and annealing at 450 °C, in which the Co-doping contents are 0, 5, and 10 mM. The surface-tovolume ratio of CZO NRs was higher than that of the pure ZnO structure. X-ray diffraction (XRD) results showed that the
synthesised NRs were a single crystalline of the hexagonal wurtzite structure with uniform growth orientation of the c-axis. In addition, increasing ethanol (C2H5OH) response depends on O vacancy (VO) adsorption, which is measured via photoluminescence (PL) emission. Compared with pure ZnO NRs, the results showed that the CZO-5 (with 5 mM Co solution) NRs exhibited a superior sensitivity in C2H5OH gas applications and a fast response/recovery time. Meanwhile, the CZO-5 gas sensor presented a high response rate of 90.71% at 300 °C operating temperature when the concentration of ambient C2H5OH gas was 100 ppm.
... 하지만 실제 냉동 사이클에 연계한 실험에서 접촉각이 작은 표면의 경우 압력강하도 함께 증가하는 단점이 발견되었다. (12,13) 수치해석을 통해 입구 유동이 유분리기 내부 구조물과 충돌하면서 난류 운동 에너지가 생성되는 것을 확인하였고 (10,11) 이를 피하기 위한 설계로서 Fig. 1 (14) 이에 본 연구에서는 Fig. 1 표면 처리의 경우 선행 연구 (12) 에서 나선구조물과 몸체 모두 친유처리를 한 경우에 가장 분리효율이 높게 나타나 본 연구에서도 Fig. 3 ...
Abstract
This study involves the preparation of colloidal silver (Ag) nanoparticle solution using Turkevich
method. Specifically, the solution is mixed with the zinc nitrate hexahydrate and
hexamethylenetetramine solution with various volume ratios (e.g. 50, 70 and 90 AgNPs %V) to
deposit zinc oxide (ZnO)–Ag thin films on glass substrates at 350 °C using chemical spray pyrolysis
technique. Then, these thin films are used to measure the sensitivity of ammonia (NH3) at room
temperature (30 °C–32 °C). The thin films formed by this technique have been characterised by the
following measurements: FE-SEM, XDR, AFM and EDXA; whereas, AFM, UV-Visible
spectrophotometer and FT-IR spectrophotometer have been used to characterise the prepared Ag
nanoparticles. The average size of ZnO–Ag nanoparticles formed on glass substrates is within the
range of 68.93–86.64 nm, whereas the average size of Ag nanoparticles formed through Turkevich
method is 48.9 nm. The XRD measurements show the wurtzite hexagonal and face centred cubic
crystal structure of ZnO and Ag, respectively. The thin film that contains 50 %V of Ag has the
highest gas sensitivity (69%). The high sensitivity of the ZnO–Ag sensor at room temperature is an
indicator of the high efficiency of NH3 gas sensing.
The effects of oil wettability on the performance of a cyclone-type oil separator was studied through in situ experimentation and in a real refrigeration system. Based on previous research, the geometry of the oil separator in the present study was designed with an oil recovery device installed at its bottom to mount it on the actual refrigerator. The performance of the oil separator without surface treatment was predicted by applying design correlations proposed in the open literature, which were then compared with the experimental data. Through surface treatment, oleophilic or oleophobic properties were given to the inner wall and helix of the oil separator, and its performance was measured in a real refrigeration system. Oil wettability had a great effect on the performance of the oil separator, and in order to obtain high separation efficiency, oleophilic properties were found to be advantageous not only in the inner wall but also in the helix.
