Artificial brochosome-shaped microspheres closely mimicking natural brochosomes are highly desired however challenging to synthesize. Herein silica brochosome-shaped microspheres (SiO2 BMs) are successfully synthesized by simply adjusting the NH4OH/p-xylene ratio. The obtained BMs, with a diameter of 530 nm and highly accessible open pores of ∼130 nm, demonstrate high similarity to natural brochosomes in size, shape, and pores geometry. A mechanism of droplets assembly originating from the surface charge transformation of the emulsion droplets is proposed by carefully investigating the in situ dynamic evolution of BMs intermediates. The priority growth of primary particles at the interface of the adjusting droplets forms the pores wall of BMs with regular distribution. Benefiting from the unique structure, the SiO2 BMs show excellent antiadhesion (superhydrophobic) and antireflection (at least 70% reduction for vertical reflection), indicating the high functional similarity to natural brochosomes. The synthesized BMs demonstrate sufficient load capacity, suggesting great potential in energy conversion and biomedical applications.
In this work, a facile, cost-effective and environmentally friendly approach is developed to synthesize transparent silica sol for fabricating antireflective (AR) and superhydrophobic (SH) films on soda–lime glass. The transparent silica sol is prepared at room temperature by modification of hexamethyl disilazane (HMDS) on colloidal silica nanoparticles (NPs) which are synthesized via base-catalyzed hydrolysis of tetraethoxysilane (TEOS) in the presence of ammonia-free alkaline solution (i.e., NaOH). The AR and SH silica films are then achieved by dip-coating. The average transmittance, water static contact angle (CA) and sliding angle (SA) of the resulting film can reach 93.1%, 169.7° and 3.0°, respectively, exhibiting both AR and SH properties. In particular, the excellent SH and AR properties of the resulting film facilitate not only the excellent self-cleaning performance but also the increasing light transmittance and thus an enhanced power conversion efficiency (PCE) in photovoltaic module.
危险品化学品经营许可证（带存储）