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Fabrication of Carbon Nanotubes on Tungsten Tips
Phan Ngoc Hong,Phan Ngoc Minh,Vo Viet Cuong,Bui Hung Thang,Phan Hong Khoi 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5
In this paper, we present the results of fabrication of carbon nanotubes on sharp W tips for advanced electron emiters and scanning probe microscopy. A calculation to optimize the elec- trochemical etching conditions for geting ultra-sharp W tips was caried out. W tips of 50 nm in diameter were formed by electrochemical etching of a 0.3-mm W wire in a 5 % KOH solution. Fe catalytic nanoparticles were deposited at the apex of the W tip by electroplating in a FeCl3 solution. By using hot-lament chemical vapor deposition in C2H2/H2 gases, we have sucesfuly grown individual CNTs of 4 m in length and 20 nm in diameter on a W tip.
Viet-Thang Le,Chi Hue Nguyen,Phuoc Trong Do,Anh Minh Nguyen,Khoi Hong Vo 대한신경외과학회 2024 Journal of Korean neurosurgical society Vol.67 No.2
Objective : This study aimed to evaluate the clinical feasibility of the combination of ultrasound and nerve stimulator guidance in transforaminal epidural steroid injections (TESIs) to manage lumbosacral chronic radicular pain. Methods : Using the combination of nerve stimulator and ultrasound guidance, TESIs were performed in 125 segments of 78 patients who presented with chronic lumbar radicular pain. Demographic characteristics and surgical outcomes were recorded on admission, pre-procedural and post-procedural for 1-week, 1-month, 3-month, and 6-month follow-ups. The result was measured using the Numeric rating scale (NRS) and Oswestry disability index (ODI). Results : Patients who received TESIs showed significant improvements on two evaluation tools (NRS, ODI), compared to that before procedure (p<0.001). No significant complications were observed for 6 months’ follow-up. Conclusion : The result suggests that a combination of ultrasound and nerve stimulator guidance in transforaminal epidural injections is safe, reliable and effective for short-term management of lumbar disc herniation. It is a promising technique and has shown good results in providing intermediate pain relief.