润色：Gold nanoparticle solution attached to MIL-101 Fe surface will produce two main forces electrostatic force and Van der Waals force Firstly the solution of gold nanoparticles carries negative charge

The attachment of a gold nanoparticle solution to the surface of MIL-101 (Fe) results in the occurrence of two primary forces: electrostatic force and Van der Waals force. The gold nanoparticle solution carries negative charges, while the MIL-101 (Fe) solution carries positive charges. As a result, electrostatic interactions, which involve the attraction and repulsion forces between positive and negative charges, occur between these charged particles. This electrostatic force facilitates the binding of gold nanoparticles with MIL-101 (Fe) particles, leading to the formation of a composite material.

Additionally, there is the presence of Van der Waals force between the gold nanoparticles and MIL-101 (Fe) particles. Van der Waals force arises from the interaction between instantaneous dipoles caused by the uneven distribution of electrons among molecules or atoms. This force is considered a short-range force and serves to further strengthen the binding between the gold nanoparticles and MIL-101 (Fe) particles