Simultaneous determination of dopamine in the presence of ascorbic acid and Uric Acid by electrochemically oxidized screen printed carbon electrode - Nguyen Xuan VietDPV curves for detection of DA in the simultaneous presence of AA and UA are shown on Figure 6. The concentration of AA and UA was kept constant of 1mM and 0.035 mM respectively, in that time the concentration of DA was increase from 1.0 to 50.0 M. The current intensity of DA peak increases when the concentration of DA increases. These DPV curve...
8 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 569 | Lượt tải: 0
Corrosion characterizations of carbon steel in cai tau river water system - Viet Nam4. CONCLUSIONS This study mainly highlights the importance of corrosion problem of Cai Tau river water cooling system. The main reason leading to this phenomenon was due to the presence of chemical compositions in the Cai Tau river water such as Cl‾, SO42-, CO32- and pH. The solutions containing different ion contents, i.e. Cl‾, SO42-, CO32- an...
12 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 486 | Lượt tải: 0
Protection of steel JISG 3141 with chromium-Free conversion coating based on inorganic salt (Zr/Ti/Mo) - Duong Thi Hong Phan4. CONCLUSION The SPCC-JISG 3141 was treated successfully by Zr/Ti/Mo- based conversion coating. The surface morphology and composition of Zr/Ti/Mo-treated samples were studied. Results obtained from SEM/EDS revealed that Zr/Ti/MoCC formed did not uniformly cover the surface of steels. Moreover, the adhesion and corrosion protection properties ...
9 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 489 | Lượt tải: 0
Bài giảng Hóa học - Chương 13: Nhóm VIIbAnhidrit perenic Re2O7 là chất rắn màu vàng, rất bền, không phân hủy khi nóng chảy và bay hơi, tác dụng với nước tạo axit perenic HReO4 Muối perenat không màu, bền hơn muối pemanganat. KReO4 bay hơi trên 1000 oC không bị phân hủy tính chất OXH của ReO4- rất yếu
31 trang | Chia sẻ: yendt2356 | Ngày: 28/11/2020 | Lượt xem: 1067 | Lượt tải: 0
A study on physico-Mechanical and anticorrosive properties of chemically modified graphene-based epoxy nanocomposite coatings - Phan Thi Thuy Hang4. CONCLUSIONS - The pristine Graphene material was successfully chemically modified via modified Tour’s method. The formed products are Graphene Oxide (GO), which are only decorated oxygen containing functional groups on the Graphene sheet surfaces but unchanged the crystal structure of Graphene. - The physico-mechanical properties of the epo...
10 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 577 | Lượt tải: 0
Characterization of fluoridated hydroxyapatite (FHA) Sol-Gel coatings on titanium substrate - Ngo Thi Anh Tuyet4. CONCLUSION The sol-gel hydroxyapatite HA and fluoridate hydroxyapatite (FHA) coatings were deposited on Ti substrate by spin coating technique with heat treatment at 900 oC for 4 hours. The incorporation of fluorine ion into HA crystal structure by substitution of F- ions for OH- groups lead to improve properties of biocompatible coatings. A...
7 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 555 | Lượt tải: 0
Bài giảng Hóa vô cơ - Chương 13: Các nguyên tố nhóm Ib - Nguyễn Văn HòaTạo thành khi đốt nóng Cu với KK hoặc nhiệt phân Cu(OH)2. - Không tan trong nước, dễ tan trong axit, tan trong dd NH3 tạo phức amiacat, phân hủy khi đun nóng CuO + 4NH3 + H2O -> [Cu(NH3)4](OH)2 4CuO -> 2Cu2O + O2 (11000C)
16 trang | Chia sẻ: yendt2356 | Ngày: 28/11/2020 | Lượt xem: 690 | Lượt tải: 0
Study on the preparation of manganese dioxide via cathodic electrolysis - Trung Dung Dang4. CONCLUSIONS Via cathodic electrolysis in KMnO4 solution, the preparation of the MnO2 was successfully done. There are two types of electrolyzed MnO2 that were synthesized: amorphous and crystalline. The formation mechanism of the MnO2 based on two processes: direct and indirect electrochemical processes. The dependence of the MnO2 cathodic e...
6 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 729 | Lượt tải: 0
Quality reinforcement of electroplating zinc coatingselectrodeposited from cyanide free alkaline solution by polyamine 70.000 and polyvinyl alcohol 16.000 - Truong Thi Nam4. CONCLUSION It was proved that additives (PVA16 and BT70) affect to zinc deposited coatings formed from alkaline non-cyanide zinc plating bath. The current density of zinc deposition reduced with the presence of additives because these additives replace H2O present in complex Zn(OH)2(H2O)-. The presence of additives also made zinc deposited c...
9 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 587 | Lượt tải: 0
Corrosion inhibition of mild steel in nacl and hcl solutions by amino acids extracted from soybean residue - Le Tu Hai4. CONCLUSION The optimum conditions for the extraction of amino acids from SR were: the ratio of solid : 6 M HCl of 1 g : 20 mL, the hydrolysis temperature of 120 0C, the extraction time of 3.5 h, and the yield of amino acids extraction was 47.10 % (based on the oven dried powder). Amino acids extracted from SR consist of 17 amino acids. The ...
9 trang | Chia sẻ: thucuc2301 | Ngày: 28/11/2020 | Lượt xem: 525 | Lượt tải: 0
