What? Can I make a fluorescent rod, too?

Wow, that's great I'm going to say that I need fluorescent sticks to go to concerts I'll buy some online! It's not a teenager What's the age? Do you buy fluorescent sticks online? Of course, I have to do it myself! Really? Can I make my own fluorescent rod? Let's learn from the friends of the society! First of all, preparations! Experimental drugs: dibutyl phthalate (DBP) (analytical pure), CPPO {oxalate, chemical name is bis [2,4,5 – trichloro-6 - (pentoxycarbonyl) phenyl] oxalate} (95%) (analytical pure), tert butanol (analytical pure), hydrogen peroxide (analytical pure) (30%), water (70-90 ℃), anhydrous sodium acetate (analytical pure), various fluorescent dyes Experimental instruments: three 10ml measuring cylinders, one 100ml beaker, one test tube rack, several test tubes, one tray balance, three spoons and glass rod Well, we also need to know the experimental principle! Take a common fluorescent rod similar to a plastic rod for example It is filled with liquid The main components of the liquid are some ester compounds and fluorescent dyes There is also a glass tube in the liquid, which encapsulates another liquid, generally hydrogen peroxide solution We usually call the solution in the outer layer liquid a and the solution in the glass tube liquid B To make the fluorescent rod glow, it needs to be bent repeatedly, so that the glass tube inside is broken, and liquid B flows out When liquid a and liquid B are mixed, they will emit light; the more even the mixture is, the better the luminous effect will be Luminescent principle of fluorescent rod: solution a is the solution of fluorescent dye and CPPO in solvent DBP, and solution B is the solution of hydrogen peroxide in solvent TERT butanol Chemical reaction equation: CPPO + H2O2 → 2c6h5oh + 2co2 hydrogen peroxide oxidizes phenyloxalate to two molecules of phenol, in this process, a high-energy intermediate will be generated, which will transfer the energy to the dye, and the dye in the electronic excited state is unstable, so it will return to the stable ground state by emitting light This kind of light is produced by chemical reaction and does not produce heat It is called chemiluminescence, that is, cold light, and the efficiency of this kind of cold light source is very high Finally we can start! Test steps: 1 Prepare solution A: 1) take about 0.5g CPPO from the tray balance and put it into the test tube, then take about 6ml DBP and put it into the test tube containing CPPO 2) Because the solubility of CPPO in DBP is relatively large at 70-90 ℃, the test tube is immersed in hot water and heated, and stirred with a glass rod to accelerate the dissolution of CPPO 3) When CPPO is completely dissolved in DBP, the dissolution is completed and solution a is completed Put it aside and let it cool naturally 2 Prepare solution B: take 5ml30% hydrogen peroxide solution and 5ml TERT butanol as solvent Mix the two and finish with liquid B 3 Mix the cooled liquid a and liquid B 1:1 in the tube and shake for a moment 4 Add a little fluorescent dye to the tube and observe the phenomenon in the dark Why? Why is it not bright? Don't worry It's not over yet 5 Add a small amount of sodium acetate into the mixture as catalyst, and observe the phenomenon in the dark Finally to the experimental phenomenon! Experimental phenomenon: before the addition of sodium acetate, a relatively weak fluorescence can be seen in the dark; after the addition of catalyst sodium acetate, the fluorescence can be observed to be obviously bright Wow, that's great! I can make my own fluorescent rod! Here is also the common sense of using the fluorescent rod: the luminous time of the fluorescent rod is 4-48 hours, the length of the luminous time is inversely proportional to the ambient temperature (i.e., the higher the ambient temperature is, the shorter the luminous time of the fluorescent rod is), and inversely proportional to the initial brightness of the fluorescent rod (i.e., the higher the luminance when the fluorescent rod is just turned on, the shorter the luminous time) We put the fluorescent rod in low temperature environment (such as refrigerator and freezer), which can inhibit the chemical reaction of two kinds of liquid in the fluorescent rod, and can be used again after taking it out Source: BNU Chemical Society