Colloidal compositions and methods of preparing same are provided. The colloidal compositions include a silicate and a metal dispersed therein. The colloidal compositions can further include a stabilizer, such as a quaternary amine, to enhance the and dispersion of the metal loading within the silicate. The colloidal compositions can be made such that the metal is dispersed within the silicate in a controlled manner.

The present invention relates to a method for preparing an aqueous or hydro-alcoholic colloidal solution of metal chalcogenide amorphous nanoparticles notably of the Cu.sub.2ZnSnS.sub.4 (CZTS) type and to the obtained colloidal solution.

The present invention also relates to a method for manufacturing a film of large-grain crystallized semi-conducting metal chalcogenide film notably of CZTS obtained from an aqueous or hydro-alcoholic colloidal solution according to the invention, said film being useful as an absorption layer deposited on a substrate applied in a solid photovoltaic device.

The present application provides a self-healing material which comprises silica sol as self-healing agent encapsulated by a polymeric shell. The self-healing material may be further embedded in a concrete mixture to heal micro-cracks in concrete. A method for preparing the self-healing material is also provided.

The present application relates to rubber accelerators, and specifically disclosed are a bimetallic synergistic rubber accelerator, a preparation method thereof, and a rubber product. The preparation method of the accelerator includes the following steps: Step S1, preparing a pre-precursor powder by a sol-gel method; Step S2, performing microwave synthesis; the Step S1 specifically includes the following steps: Step S11: dissolving a cobalt salt and a manganese salt in water, adding polyethylene glycol and then stirring evenly, and adjusting the pH to 7.5-8 with an alkali solution to obtain an initial reaction solution; Step S12: reacting the initial reaction solution at 50-70 C., then drying to obtain a xerogel, and then pulverizing and screening to obtain the pre-precursor powder. The accelerator of the present application can be used to prepare rubber products. The accelerator has the advantages of shortening the vulcanization time and improving the overall performance of the rubber products.

The present application provides a self-healing material which comprises silica sol as self-healing agent encapsulated by a polymeric shell. The self-healing material may be further embedded in a concrete mixture to heal micro-cracks in concrete. A method for preparing the self-healing material is also provided.

The present application provides a self-healing material which comprises silica sol as self-healing agent encapsulated by a polymeric shell. The self-healing material may be further embedded in a concrete mixture to heal micro-cracks in concrete. A method for preparing the self-healing material is also provided.