The latter contains  numerous tightly, irregularly packed single particles (about 8 nm in diameter) and pores with a diameter of 24 nm, surrounded by tiny particles, arranged in a ring (with a diameter of 130 nm) and clusters of up to eight particles 12 nm in diameter each.
The latter is composed of numerous tightly packed, irregularly shaped particles (about 8 nanometers in diameter), pores with a diameter of 24 nanometers, surrounded by tiny particles, arranged in a ring (with a diameter of 130 nanometers) and clusters of up to eight particles, each measuring 12 nanometers in diameter.