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Characterization and dielectric studies of hydrogen-beam-irradiated PDMS polymeric materials
Haifa A. Al‑Yousef,B. M. Alotaibi,A. Atta,M. M. Abdel‑Hamid 한국고분자학회 2023 Macromolecular Research Vol.31 No.8
In this work, PDMS films are treated with varying fluence of hydrogen ion beams (6 × 1017, 9 × 1017, and 12 × 1017 ions/cm2) for used in storage energy devices. XRD and FTIR were used to analyze the PDMS films. Furthermore, the SEM is employed to study the morphological alterations in treated PDMS films. Both XRD and FTIR result indicated that PDMS is chemically interacting after ion treatment. In addition, the dielectric parameters of PDMS films are measured using an LCR device in the frequencies 102–106 Hz. After PDMS exposed to 12 × 1017 ions/cm2, the dielectric constant of the PDMS increased from 23.4 to 44.8, and energy density increased from 1.01 × 10–4 to 1.92 × 10–4 J/m3, while the conductivity increased from 0.29 × 10–7 to 4.3 × 10–7 S/cm. Moreover, the real M′ decreased from 0.198 for PDMS to 0.165 for 6 × 1017 ions/cm2 and to 0.052 at 12 × 1017 ions/cm2, while the imaginary M″ is decreased from 0.205 to 0.155 for 6 × 1017 ions/cm2, and to 0.069 for 12 × 1017 ions/cm2. The studies indicated that the structure as well as electrical characteristics of the treated PDMS had been improved, which allowing being used these substances in different electronic instrumentations.
B. M. Alotaibi,A. Atta,M. R. Atta,E. Abdeltwab,M. M. Abdel-Hamid 한국고분자학회 2023 Macromolecular Research Vol.31 No.1
This work attempts to modify the hydrophilic-adherence properties of polydimethylsiloxane (PDMS) by exposing to oxygen beam for used in painting, printing, and clothing applications. The structural and morphology changes of irradiated PDMS films are analyzed using XRD and SEM, respectively. The chemical functional group is investigated by Fourier infrared spectroscopy (FTIR). The contact angle for water is reduced from 81.38° to 42.50°, while the contact angle for diiodomethane is reduced from 63.20° to 25.40° by varying the irradiation time from 1.5 to 6 min. On the other hand, for water liquid, the adhesion work is enhanced from 82.75 to 125.5 mJ/m2, and for diiodomethane liquid, it’s increased from 73.70 to 96.68 mJ/m2. Moreover, the polar energy γsp is enhanced from 6.44 to 20.25 mJ/m2, while, the γsd is increased from 26.73 to 46.01 mJ/m2, and the total γst is increased from 33.18 to 66.26 mJ/m2 by enhancing exposing time 1.5–6 min. The improvement in the adhesion and surface energy of the irradiated PDMS films is due to oxygen ion beam induced decreasing in PDMS surface hydrophobicity. The experimental data show the surface morphology, structure and surface properties of treated PDMS are modified and depend closely on the oxygen beam irradiation time.
Prognostic and Oncologic Significance of Perineural Invasion in Sporadic Colorectal Cancer
Alotaibi, A. M.,Lee, J. L.,Kim, J.,Lim, S. B.,Yu, C. S.,Kim, T. W.,Kim, J. H.,Kim, J. C. Springer Science + Business Media 2017 Annals of Surgical Oncology Vol.24 No.6
<P>PNI positivity is an independent predictor of aggressive behavior and unfavorable prognosis in CRC. Further evaluation is needed to confirm the impact of PNI status on survival in stage IIA CRC.</P>
Effect of ZrC additives on the microstructure and hardness of ZrN-ZrSi2 composite
Z. I. Zaki,S. H. Alotaibi,M. Alsawat,B. A. Alhejji 한양대학교 세라믹연구소 2021 Journal of Ceramic Processing Research Vol.22 No.4
High-density zirconium nitride ZrN/ZrSi2 composite reinforced with different fractions of insitu formed ZrC were synthesizedby dynamic-compaction combustion synthesis from Zr–Si3N4–C powder blends. The effect of ZrC fractions, compressionloads, and delay time on the composite properties was investigated. ZrC additives were found to decrease the sample porosityand improve the sample hardness. Increasing the compression load greatly enhanced the sample hardness and reduced thesample porosity. The samples were characterized using XRD, SEM, hardness and porosity. The attained composite having 20wt% ZrC was found to furnish a highly homogeneous microstructure with less than 1.0 vol open porosity and a maximumhardness value of 1308 HV achieved at 234 MPa compression load.
Nageshwaran Sathiji K.,Deng Francis,Regenhardt Robert W.,Das Alvin S.,Alotaibi Naif M.,Patel Aman B.,Stapleton Christopher J. 대한뇌혈관외과학회 2022 Journal of Cerebrovascular and Endovascular Neuros Vol.24 No.3
Vertebrovertebral arteriovenous fistulas (VVAVFs) are rare entities that lack consensus guidelines for their management. Our case describes the successful treatment of a traumatic VVAVF via a contralateral deconstructive endovascular approach. A 64-year-old female presented following a traumatic fall. Computed tomography angiogram highlighted a 2 cm pseudoaneurysm of the right vertebral artery (VA) with epidural contrast enhancement and a hematoma with flow voids within the epidural space. Digital subtraction angiography showed a VVAVF at C2-3 with retrograde filling of the distal right VA. Having undergone several unsuccessful passes of the proximal dissection flap in the right VA, the patient underwent a contralateral deconstructive approach with correction of the VVAVF without complication. The remaining feeding branches had occluded after 1 week. The patient made a complete recovery without neurological sequelae at 3-month follow-up.