Methods of making filtration articles having filtration material deposits

A method for applying a surface treatment to a plugged honeycomb body comprising a honeycomb structure of a plurality of axial porous walls defining a plurality of axial channels extending in an axial direction, the method comprising:

• atomizing a dispersion of particles of an inorganic material into liquid-particulate-dispersant droplets comprised of:
• a liquid vehicle comprising methanol, acetone, hexane, or combinations thereof;
• a particle dispersant comprising:
• triethanolamine, triethoxyvinylsilane, vinyltrimethoxysilane, 5-hexanyltrimethoxysaline, or combinations thereof;
• and
• the particles;
• evaporating substantially all of at least the liquid vehicle from the droplets to form agglomerates of the particles;
• depositing the agglomerates within the plugged honeycomb body;
• and
• wherein the deposited agglomerates are disposed on, or in, or both on and in, the porous walls.