Afterwards, all of the obtainedHPB solution containing 1 × 10−8 mol of phosphate was transferred to a 50 mL beaker containing a stir bar and placed on a magnetic stirrer, and the magnetic stirrer was turned on. Next, 1.3 mL of concentrated sulfuric acid was safely added. Afterwards, a 90 μL volume of 1-undecanol was accurately placed onto the surface of the solution using amicrosyringe, and the solution was stirred at 500 rpm at room temperature.