Let \( f \) be a differentiable function satisfying \( f(x)=\dfrac{2}{\sqrt{3}}\displaystyle\int\limits_{0}^{\sqrt{3}} f\!\left(\frac{\lambda^{2}x}{3}\right)\,d\lambda,\, x>0 \) and \( f(1)=\sqrt{3} \). If \( y=f(x) \) passes through the point \( (\alpha,6) \), then \( \alpha \) is equal to _________.