Preparation of Gd Complex-Immobilized Silica Particles and Their Application to MRI

Figure 4

UV-Vis absorption spectra of supernatants of mixtures of NH₂/SiO₂ particle colloid solutions and TNBS aqueous solutions. The surface modification with amino groups was performed at pHs of 3, 5, 7, 9, and 11. Inset shows absorbance at 347 nm as a function of pH of mixture of silica particle colloid solution and APMS.