code: def make_dynamical_potential_func(kBT_Gamma, density, SpringPotnlFunc):
      
      def PotentialFunc(xdata, Radius):
          """
          calculates the potential given the position (in volts) 
          and the radius of the particle.
  
          Parameters
          ----------
          xdata : ndarray
              Positon data (in volts)
          Radius : float
              Radius in units of nm
  
          Returns
          -------
          Potential : ndarray
              Dynamical Spring Potential at positions given by xdata
          """
          mass = ((4/3)*pi*((Radius*10**-9)**3))*density
          yfit=(kBT_Gamma/mass)
          Y = yfit*SpringPotnlFunc(xdata)
          return Y
      return PotentialFunc
docs: Creates the function that calculates the potential given
      the position (in volts) and the radius of the particle. 
  
      Parameters
      ----------
      kBT_Gamma : float
          Value of kB*T/Gamma
      density : float
          density of the nanoparticle
      SpringPotnlFunc : function
          Function which takes the value of position (in volts)
          and returns the spring potential
      
      Returns
      -------
      PotentialFunc : function
          function that calculates the potential given
          the position (in volts) and the radius of the 
          particle.