Patent ID: 11865573
Assignee: INDUSTRY-UNIVERSITY COOPERATION FOUNDATION HANYANG UNIVERSITY
Field: Basic materials chemistry (Chemistry)
Classification: CPC B  C | IPC B  C

Claim 0:
1. An electrostatic spray deposition method comprising:
injecting a slurry into a syringe of an electrospray apparatus including the syringe connected to a nozzle and a stage positioned below the nozzle and supporting a substrate, wherein the slurry comprises a mixed solvent including a first solvent and a second solvent, a first polymer dissolved in the mixed solvent, and first polymer particles containing a second polymer and dispersed in the mixed solvent;
applying a predetermined electric field between the nozzle and the stage to spray droplets in cone-jet mode from the nozzle; and
depositing the droplets on the substrate to form a coating film,
wherein the slurry is obtained by completely dissolving the first polymer and the second polymer in the first solvent and then adding the second solvent to selectively precipitate the second polymer to form the first polymer particles having an average diameter of 5 to 90 nm in the slurry,
wherein the coating film includes second polymer particles and a connecting part connecting the second polymer particles, each of the second polymer particles having a core and a shell, where the first polymer particle is the core, the shell and the connecting part includes the first polymer, and the shell and the connecting part are formed through evaporation of the mixed solvent to precipitate the first polymer from the droplets, and
wherein the first solvent is a solvent having a Hansen Relative Energy Difference (RED) of less than 1 for the first polymer, and the second solvent is a solvent having a RED of greater than 1 for the second polymer, wherein the RED is represented by the following equation:

RED=Ra/R0  [Equation]

in the above equation,

Ra=√{square root over ((2δh2−2δh1)2+(δp2−δp1)2+(δd2−δd1)2)}

R0 is the polymer's interaction radius, δh1 is the polymer's hydrogen bond interaction, δp1 is the polymer's polar interaction, δd1 is the polymer's dispersion force, δh2 is the solvent's hydrogen bond interaction, δp2 is the solvent's polarity interaction, and δd2 is the solvent's dispersion force.