Solid-state drive

The carbon supported PtFeS catalysts were prepared by a modified polyol method. In brief, 0.3 g carbon (Ketjen-black heat-treated at 2250 °C, SE = 160 m2 g-1) was dispersed in 135 g ethylene glycol. 5.993 g of 8 wt% H2PtCl6 (Umicore; Pt content, 39.8 wt%), 1.874 g of 8 wt% FeCl3. 6H2O (Sigma-Aldrich), and 0.352 g of 8 wt% (NH2)2SC (Sigma-Aldrich) previously mixed in ethylene glycol were added to the dispersion. The pH of the stirred reaction mixture was adjusted to ∼11 using 1 M NaOH dissolved…

Permafrost Remember Mood Rings? They were rings that change colors depending on your emotions. At least that’s what they wanted us to think. Mood Rings are really thermochroic liquid crystals that color changes based on the temperature of the finger. Something that seems so permanent like the color of a crystal is subject to change just by the mere change of the temperature of its environment. Some environments are also rigid and structured just like the crystals in Mood Rings, but yet, are also…

The topic for the experiment is how a cold pack can be improved. The problem statement is “Which chemicals would work best at lowering the temperature of water to improve a cold pack?”. The Independent variables are the are three chemicals, ammonium chloride, sodium chloride, and calcium chloride, that will be added to the water. The dependent variable is the temperature of the water in degrees Fahrenheit after the chemicals are added. The constants are the 50 mL of water in each cup, the…

Ice transforms at a point of degrees. This degree would be 32 degrees Fahrenheit or 0 degrees Celsius. It must be at this degree or lower to transform into ice. If it is higher than the freezing point of water, then it will be a form of water or ice melting into water. The different molecules, or also called the things that make up the ice or water, are more dense in cold water. They become dense and come to each other which makes them tight into an ice cube. When the ice gets warm, it moves the…

methylene chloride was slowly added until all the crystals which had formed were dissolved. The liquid was filtered and washed twice with 10 mL of methylene chloride. The toluene and methylene chloride was then removed with rotary evaporator. The solid residue was…

VII. Discussion 1. Why was the solution heated and then cooled during the recrystallization of the crude acetaminophen? Recrystallization is a very important method of purification for organic solids. This process is carried out by the separation of compounds based on the difference in solubility. The steps to recrystallization can be described by the following • Choose an appropriate solvent based on the compound’s characteristics • Dissolve the compound in the minimum amount of solvent •…

quickly is due to a colligative property called freezing point depression. Freezing point depression is the process by which adding a solute to a solvent decreases the freezing/melting point of the solvent, allowing the solvent to maintain its liquid state at a much lower temperature than it usually would (Libretexts, 2016). Liquid water is better at transferring heat than ice, so the ice in the bag must be melted into water while still being cold enough to freeze the ice cream mixture. For this…

Table 3 shows the BET surface area of both the fresh and hydrothermally aged SCR catalysts. For fresh BEA zeolite and SCR catalysts, as the doping amount of catalytic additive increases, the BET surface area decreases, probably because the additive Cu, Ce, and Nb species blocked some of the zeolite channel, hindering the entry of N2 into the pores (Bin et al. 2014). After aging at 600 °C, all the samples showed 3-20 m2/g increased BET surface area. Aging condition of 600 °C is a relatively mild…

expected, it was found pure HA sample excluded magnetic properties (i.e diamagnetic behavior) and La0.1Sr0.1HA nanoparticles exhibited weak ferromagnetic ordering of hysteresis loop Fig. 7(b). The magnetization values are mainly depending on the charge state of the doped element [41]. From this study, saturation magnetization [Ms] and Retentivity [Mr] values of La0.1Sr0.1HA nanoparticles bring to 0.975 x10-3 emu/g and 0.1805 x10-4 emu/g…

Paragraph 1 Compare and contrast the crystal structures and crystal chemistry of quartz, α-FePO4 and β-FePO4. Haines’ research paper studies the change that occurs in the FePO4 structure as it is studied from temperatures 294K to 1073K. A transition is noticed at 980K, when it’s tetrahedral α-quartz structure experiences high pressure levels, changing the structure to β-phase, a more dense octahedral structure. Cell parameters of FePO4 in α-phase increases in cell parameters and volume as…