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Chromic acid

Manufactured by Merck Group
Sourced in Germany, Australia

Chromic acid is a chemical compound with the formula H2CrO4. It is a strong oxidizing agent commonly used in laboratory settings for various applications. The core function of chromic acid is to act as a cleaning and oxidizing agent, particularly in the removal of organic contaminants from surfaces.

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3 protocols using chromic acid

1

Optimized In Vitro Immersion Test Setup

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An optimized in vitro test setup was used for the immersion tests [42 (link), 43 ]. Cell culture medium (CCM), Dulbecco's Modified Eagle's Medium (DMEM), and GlutaMAX +10% FBS (fetal bovine serum, PAA laboratories, Linz, Austria) were used for the immersion test and cell culture. The cell culture conditions were 5.0% CO2, 20% O2, 37.0°C, and 97.0% rH (relative humidity). Discs were weighed by a Scaltec SBA32 (Scaltec, Goettingen, Germany) and sterilized ultrasonically in 70% ethanol solution for 30 min. After drying, the discs were transferred to 12-well plates, which were filled with 2 mL CCM in each well, and then incubated in the cell culture conditions for 1 week. The old cell culture medium was replaced by a fresh one after 48 and 120 hours. After the immersion test was carried out for 168 hours, the degradation products were removed by chromic acid (180 g/L in a. dest., Sigma-Aldrich Chemie, Taufkirchen, Germany). The discs were dried in a vacuum box and weighed by the precision electronic balance. The mean degradation rate was calculated using the previously described weight loss method [44 (link)].
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2

Preparation and Characterization of Aluminum Foils

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Aluminium foils (99.9997% purity and 0.32mm thick) were purchased from Goodfellow Cambridge Ltd. (UK). Oxalic acid (H 2 C 2 O 4 ), perchloric acid (HClO 4 ) and chromic acid (H 2 CrO 4 ), were supplied by Sigma-Aldrich (Australia). Ethanol (C 2 H 5 OH, EtOH), sulfuric acid (H 2 SO 4 ) and phosphoric acid (H 3 PO 4 ) were purchased from ChemSupply (Australia). Ultrapure Milli-Q® water (18.2 mΩ•cm) was utilized to prepare all aqueous solutions.
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3

Wet-Chemical Etching Protocol

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Phosphoric acid, acetic acid, chromic acid, nitric acid, perchloric acid, oxalic acid, ethanol, acetone, and terephthalic acid were purchased from Sigma-Aldrich and used without further purification. The photoresist AZ 1512 and the AZ developer CD30 were obtained from Clariant (Somerville, NJ), and high purity aluminum sheet was obtained from Sigma-Aldrich. Deionized water (18.3 MΩ cm) was obtained by using a reverse osmosis water system (Human Science, Korea).
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