Materials and synthesis The fully organic phase system contains silver nitrate as a silver precursor, n-butylamine (BA) as an alkyl ligand dissolving silver salt, dodecanoic acid (DDA) as a capping molecule, toluene as a medium, and NaBH4 as a reducing reagent. The silver nitrate, DDA, BA, and NaBH4 were purchased from Junsei Chemical, and they were used as received without further purification. The scheme for direct synthesis of silver nanoparticles from silver nitrate in the organic phase is illustrated in the given figure. Silver nitrate was first dissolved in BA completely and then toluene was poured into the above solution, which resulted in a molar concentration ([Ag]) above 2 M. After addition of DDA and equimolar reductant, the solution became dark brown and then was refluxed for 1 h. After completion of the reaction, the products were precipitated by addition of acetone/methanol mixture. The precipitateswere collected through a glass funnel filter and then washed several times by methanol and acetone. Metallization and patterning Measurement of the specific electrical resistance with the fourpoint probe technique requires samples with uniform thickness, which can be made by spin coating. Ag NPs were …show more content…
With regard to dispersion, the Ag ink is still stable without other additional dispersants even at a metal content of 70 wt%. This is attributed to the MPC structure of Ag NPs. The figure above represents a series of inkjetting processes with time: the formation and jetting of a droplet with diameter 50 μm. Silver metallic lines were patterned on polyimide and then metallized at 250oC for 30 min. From the given study, it can be anticipated that the as-synthesized silver nanocrystal can be an excellent material for an electrode and therefore can be applied to printed
Colloidal silver is particles of silver broken down or mixed into liquid. In the early 20th, ,century colloidal silver or as it is more popularly known “silver water” was marketed as a cure for tumors; now in alternative medicine it is referenced as a cure all with healing properties.
I would suggest to students performing the nitration to make sure their benzoic acid product is very fine and broken up before reacting it, as it has a tendency to clump together when it dries and thus proves very difficult to react in solution. I would also suggest keeping a very close eye on the temperature when adding the sulfuric/nitric acid mixture dropwise, as the reaction has a tendency to spike in temperature
Schlesinger, Mordechay. "Electrochemistry Encyclopedia." Electroplating. Department of Physics, University of Windsor, Sept. 2002. Web. 17 Nov. 2013.
== == == == == silver nitrate + sodium chloride =
A propellant is used in the military application and it is consists of oxidizer, fuel, plasticizer, curing agent and cross linkers. The commonly used oxidizer is ammonium perchlorate. But its combustion products are environmentally hazardous. Nowadays, ammonium nitrate is gaining great attraction in the field of propellant as a great oxidizer. Ammonium nitrate is an inorganic compound used as fertilizer, oxidizer and also for other applications. AN combined with fuel can be used in gas generators . The ammonium nitrate extracted from demilitarized rocket motors can be used as an oxidizing agent in the hydrothermal oxidation of organic wastes . It has seven phase transitions3.
in the experiment of the Atomic Wight of the Element Silver. We react excess amount of copper with silver nitrate solution. To determine the amount of copper reacted and silver that is produced. The first thing that we did was rinsed 150 ml beaker with distilled water. Second, we dispense 10.00 ml of silver nitrate into rinsed beaker. Then we added 100 ml of distilled water to the beaker. Third we obtain a precut copper wire and then winded around large wide mouth test tube to produce a helix or coil of wire. After that we weighed the wire which is 2.1290g in balance number 5. Fourth, we placed the copper wire in the beaker containing dilute silver nitrate solution at 11:30 and then we taped on the copper wire to dislodge the silver metal into
Before any chemical reactions occurred, there was 0.46 grams of elemental copper metal. After the copper was added to the 250 milliliter beaker containing the 5.0 milliliters of nitric acid, nitrogen dioxide gas came out. The gas color was a light brown color, and the clear nitric acid within the beaker became a green-brown color. Once the chemical reaction concluded and nitrogen dioxide gas stopped releasing from the beaker, 20 milliliters of distilled water was added to the solution, and the color within the beaker turned to a neon blue. This was the chemical equation for the first chemical reaction, 4 HNO3 (aq) + Cu (s) → Cu(NO3)2 (aq) + H2O (l) + 2 NO2 (g).
Our unknown solution, test tube 1024, contained mercury (I) and lead. Throughout the entire experiment, we performed the same reactions in a known solution that contained all three metal ions as a visual comparison to determine what qualities one should observe after each added compound. Because each ion was initially in a compound with nitrate (NO3) in an aqueous, solution we added hydrochloric acid (HCl) to both solutions, and both solutions formed a white precipitate. Because all three metal ions form a white precipitate when bonded with chlorine (Cl‐), it remained unclear which specific ions were present. We then decanted the supernatant and submerged each test tube with the remaining precipitate in a hot water bath. Lead (II) chloride,
The technique calls for about quantitative yields, however our planning contained on the normal just fifty percent sodium ferrate(lV). The error is credited to the vicinity of little amounts of dampness in the materials and mechanical assembly. Sodium ferrate(lV) disproportionates in water or basic arrangements as per the response:
The purpose of this experiment was to determine the properties and identity of an unknown white compound, and create a synthesis reaction to verifiably produce one gram of the compound. The compound was identified as sodium acetate using solubility, ion, pH, flame, and acidification tests. For both the unknown and synthesized compounds, the solubility test was positive, the pH test result was 7.5, and the acidification test produced a strong vinegar smell, all of which were results consistent with known properties of sodium acetate. Additionally, the cation/anion and flame tests were conducted comparatively with sodium acetate and the unknown compound to show that neither contained ammonium, halide, sulfate, or carbonate ions, and that both burned with a bright orange or yellow flame. Lastly, the synthesis reaction was then conducted to produce sodium acetate through a reaction of sodium hydroxide and acetic acid.
The Examination of Chemical Reactions in Multiple Chemical Compounds to Identify Types of Energy Changes and Types of Reactions The purpose of this lab is to investigate chemical reactions that takes place between different chemical compounds. The products formed through these reactions will be observed for physical properties and chemical changes. Pour 100 mL of citric acid into an Erlenmeyer flask. Fill a clay crucible with baking soda.
For the last part of our lab we had to test the conductivity. However, we did not realise that we cannot test the conductivity of the substances which did not dissolve in water. Therefore, the conductivity for the salicylic acid crystals, benzoic acid crystals and “unknown 1” are inaccurate and thus only the conductivity of the other three substances are accurate. Due to the lack of time we were unable to produce another test to test the property of the compounds.
The purpose for this procedure is for students to familiarize themselves with how different types of properties can lead up to identifying substances. For the safety of this experiment be sure to always have your goggles on and tightly secured, due to any splattering of chemicals or glass breakage. Under no circumstance should any chemical be near your mouth. In this procedure students will use four methods that will help identify what is their unknown substance. Once all methods are done its data will provide physical properties of numerical values which students will compare to the list that will lead to identifying their pure substance. The four methods in this experiment are finding the density (g/mL), the solubility, the melting point
Neidig, H. A., and J. N. Spencer. "Precipitating Lead Chromate on a Small Scale." General Chemistry For Engineering And Science. Mason: Cengage Learning, 2012. 83-90. Print. Signature Lab Ser.
•Mass of magnesium ribbon = Mass of crucible, cover and magnesium ribbon - Mass of crucible and cover = 28.80 g - 27.88 g = 0.92 g