Preparation method of microspheres

Introduction

The birth of microspheres is actually a "tech show" full of creativity and wisdom. The preparation technology of microspheres is like a "magic key" to unlock the treasures of the microscopic world. Today, let's embark on this wonderful journey to uncover the "manufacturing code" of microspheres and explore the magical process of their production together. The preparation technology of microspheres mainly falls into two categories, each resembling a different magic wand in the hands of a magician, with their own magic and application scenarios. The first category of technology uses monomers as raw materials. The advantage of this method lies in its diversity and flexibility. By combining different monomers, copolymer microspheres can be prepared to meet different functional requirements.

In addition, this method excels particularly in producing uniform microspheres ranging from submicron to micron scales, which is crucial in the fields of precision drug delivery and diagnosis. The second type of technology utilizes polymers as raw materials. Although the choice of preparation methods is relatively limited, this approach allows for the customized preparation of microspheres based on the specific characteristics of polymer materials. The key to this method lies in selecting or developing preparation techniques that suit the specific material properties, thereby achieving high performance and specific applications of microspheres. These two microsphere preparation techniques each have their advantages, driving the widespread application of microspheres in various fields such as biomedicine, materials science, energy storage, electronic information, aerospace, and military industry.

Prepare microspheres using monomers as raw materials

There are many methods for preparing microspheres using monomers as raw materials. Traditional methods mainly include emulsion polymerization/soap-free emulsion polymerization, dispersion polymerization/precipitation polymerization, microemulsion polymerization, suspension polymerization, and seed polymerization, as detailed in Table 1 below.

Table 1 Comparison of traditional methods using monomers as raw materials

Prepare microspheres using polymer as raw material

Preparation using polymers as raw materials refers to the use of already formed polymers, such as natural polymers, biodegradable molecules, and block polymer materials, as raw materials for the preparation of microspheres. The methods mainly include emulsification-solidification, microporous membrane emulsification, microfluidic method, single coacervation, complex coacervation, spray drying, and self-emulsification-solidification, as illustrated in Table 2 below.

Table 2 Comparison of preparation methods using polymers as raw materials

Summary

Microsphere preparation technology is rapidly advancing. In the future, with the continuous maturity of cutting-edge technologies such as microfluidic technology and novel microporous membrane emulsification methods, as well as the ongoing optimization of traditional methods, the preparation of microspheres will become more precise and diversified, further promoting their widespread application in various fields such as biomedicine, materials science, energy storage, electronic information, aerospace, and military industry. The "manufacturing code" of microspheres is gradually being unlocked, and we will continue to introduce various preparation methods of microspheres. Please stay tuned.