Fabrication of Stainless Steel Mold Using Electrochemical Fabrication Method for Microfluidic Biochip

2008 ◽  
Vol 47 (6) ◽  
pp. 5217-5220 ◽  
Author(s):  
Min-Soo Cho ◽  
Hyun-Woo Lim ◽  
Caroline Sunyong Lee ◽  
Byung-Ki Cho ◽  
Jin-Goo Park
2018 ◽  
Vol 15 (1) ◽  
pp. 7-17
Author(s):  
Heon-Yul Ryu ◽  
Myeong-Jun Kim ◽  
Nagendra Prasad Yerriboina ◽  
Ramanathan Srinivasan ◽  
Jin-Goo Park

2021 ◽  
pp. 096739112199958
Author(s):  
Vahti Kılıç ◽  
Feridun Hurmuzlu ◽  
Yılmaz Ugur ◽  
Suzan Cangul

The aim of the present study was to investigate and compare the quantity of residual monomers leached from the bulk-fill composites with different compositions polymerized at varying layer thickness. Three bulk-fill (X-tra-fil, Beautifil Bulk Restorative, Fill-Up) and a nanohybrid composite (Filtek Z550) were used for the study. The composite resin samples were prepared with a stainless steel mold. For each composite, two groups were constructed. The samples in the first group were prepared using the 2 + 2 mm layering technique. In the second group, the composite samples were applied as a 4 mm-thick one layer and polymerized. Then, each composite samples were kept in a 75% ethanol solution and residual monomers released from composite resins were analyzed with an HPLC device after 24hour and 1 month. The data were analyzed using Kruskal-Wallis and Mann-Whitney U tests. Except the Fill-Up, all of residual monomer elution from the bulk-fill composites was significantly affected by the layer thickness (p < 0.05). The greatest monomer release was detected at 1 month after polymerization as a single 4 mm layer for Beautifil Bulk Restorative. Fill-Up composite showed similar residual monomer release in polymerization at different layer thicknesses compared to other composite resins. In the 2 + 2 mm layering technique, the least monomer elution was detected in the Filtek Z550 composite group. While Bis-GMA was the most released monomer in X-tra fil composite, UDMA was the most released monomer in all other composite resins. During polymerization of the bulk-fill composite, the layer thickness of the composite applied may affect the amount of residual monomers released from the composite resins. Conventional composites may release less monomer than bulk-fill composites when used with layering.


1987 ◽  
Vol 134 (5) ◽  
pp. 1191-1193 ◽  
Author(s):  
Kingo Itaya ◽  
Takayuki Abe ◽  
Isamu Uchida

2020 ◽  
Vol 31 (8) ◽  
pp. 3408-3419 ◽  
Author(s):  
L. Heidari ◽  
A. Tangestani ◽  
M.J. Hadianfard ◽  
D. Vashaee ◽  
L. Tayebi

2019 ◽  
Vol 29 (6) ◽  
pp. 351-355
Author(s):  
Bouklouche Issam ◽  
Younes Rassim ◽  
Idir Abdelhek ◽  
Bradai Amokrane ◽  
Sadeddine Abdelhamid

2016 ◽  
Vol 5 (1) ◽  
Author(s):  
N.W. Yuningrat ◽  
N. Retug ◽  
I.M. Gunamantha

Abstrak Tujuan penelitian ini adalah untuk mengetahui karakteristik batu apung dan semen yang digunakan sebagai bed dalam reaktor fixed bed dan efektivitasnya dalam mendegradasi methyl orange akibat pengaruh pH larutan dan sinar dalam sistem reaksi. Bed yang digunakan adalah batu apung berukuran kecil dengan perekatan semen dalam cetakan stainless steel berukuran 5x16x16 cm. Fotodegradasi methyl orange dijalankan pada pH larutan 7 dan diberikan sinar 2 buah lampu UV Sankyo Denky FT10T8BLB FL10BLB 10 W 325 nm selama 1, 2, 3, 4, 5, 6 dan 7 jam. Methyl orange disirkulasi pada temperatur kamar dari tangki penampungan menuju reaktor fixed bed menggunakan pompa dengan debit sebesar 6,89 mL/detik. Batu apung dan semen yang digunakan sebagai bed dianalisis bentuk dan unsur yang dikandungnya dengan menggunakan SEM EDX. Konsentrasi methyl orange sebelum dan setelah proses fotodegradasi diukur dengan menggunakan spektrofotometer UV Visibel Shimadzu 1240. Hasil penelitian menunjukkan bahwa batu apung memiliki bentuk yang tidak beraturan dengan kandungan unsur tertinggi berupa Si sedangkan semen yang digunakan sebagai perekat memiliki bentuk seperti butiran yang homogen dengan kandungan unsur tertinggi Ca. Fotodegradasi methyl orange berjalan optimum pada pH 3 untuk waktu penyinaran 7 jam sebesar 40,37%. Degradasi methyl orange berlangsung efektif dengan adanya sinar dibandingkan tanpa penyinaran. Reaksi fotodegradasi methyl orange mengikuti kinetika reaksi orde satu semu dengan nilai k sebesar 0,0378 jam-1. Kata kunci : batu apung-semen, fotodegradasi, methyl orange, reaktor fixed bed Abstract The objectives of this research were to know the characterization of pumice stone and cement used in fixed bed reactor. The fixed bed used was made from pumice stone with a gluing cement in 5x16x16 cm stainless steel mold. Methyl orange photodegradation were carried out with pH 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,and 14 and irradiated by 2 lamps of UV Sankyo Denky FT10T8BLB FL10BLB 10 W 325 nm for 1, 2, 3, 4, 5, 6 and 7 hours. Methyl orange was circulated at room temperature from its reservoir to fixed bed reactor by a pump with 6.89 mL/s. Pumice stone and cement were analyzed by SEM EDX to know its characterization. Methyl orange concentration before and after photodegradation were measured by UV Visible Spectrophotometer Shimadzu 1240. The result showed that pumice stone has irreguler shape with the highest material is Si and cement has homogeneous granule with the highest material is Ca. The best fotodegradation of methyl orange with UV irradiation at pH 3. Methyl orange photodegradation follows pseudo first order kinetics with reaction constant 0,0378 hour-1. Keywords : fixed bed reactor, methyl orange, pumice stone-cement, photodegradation


2020 ◽  
Vol 143 (7) ◽  
Author(s):  
Xing Li ◽  
Chao Yan ◽  
Qi Liu ◽  
Guangneng Dong

Abstract Interface interaction between gallium-based liquid metal and copper-based materials results in the formation of intermetallic CuGa2 grains. In particular, CuGa2 grains are able to produce a uniform film and the newly formed CuGa2 film holds peculiar characteristics, which have not been fully explored up to now. In this study, we present an electrochemical fabrication method of an in situ CuGa2 film on copper surface. Surface morphology and chemical composition of this film are confirmed. Tribological experiments demonstrate that the CuGa2 film enables good antifriction and antiwear abilities. Furthermore, the lubrication mechanisms of the CuGa2 film are revealed.


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