For the current measurement method, the refractive index of silica was used for determination of the particle size distribution. FIG. 7 shows the particle size distribution of a silica capsule obtained after heterocoagulation. Exact values of the particle size distribution of the heterocoagulated sample shown in FIG. 7 are provided in Table 2 below. A bimodal size distribution is shown, indicating some percentage of aggregation. Gravimetric analysis and thermogravimetric analysis of (i) silica capsule and (ii) hetero-coagulated silica capsules with poly-NIPAM latex particles There are many ways to utilize the hetero-coagulated silica capsules with poly-NIPAM latex particles and one (ideal) way is to use the material in the form of dispersion in formulations. In this example, the solid content of the material (estimated gravi metrically) is 0.01 3 g/mL (or 0.01 4 g/g). To determine the content of poly-NIPAM latex layer adsorbed on the silica capsules, thermogravimetric analysis (TGA) was performed on both (i) silica capsule and (ii) hetero-coagulated silica capsules with poly-NIPAM latex particles. Table 2. Particle size distribution of a heterocoagulated sample shown in FIG. 7