Used as a surface modifier in biomedical and nanotechnology applications. Enhances biocompatibility and reduces protein adsorption on surfaces such as silicon wafers, glass, and nanoparticles. Commonly applied in microarray technology, biosensors, and drug delivery systems to create stealth coatings that prolong circulation time and improve stability. Its silane end group enables strong covalent attachment to hydroxyl-rich surfaces, while the mPEG chain provides a non-fouling, hydrophilic layer.