PVC particles stabilized water–ethanol compound foams

How Rigid Rods Self‐Assemble at Curved Surfaces

“…[4,6,10] The addition of a larger amount (10-90 vol %) of ethanol to particle dispersions has been previously used to change the solvent quality and improve particle wettability, foaming, and emulsification capacity. [3,17] However, in our case, the contact angle of modified rods against a solution of ethanol in water (2.0 wt %) was practically the same as that against distilled water, which indicated that the wettability of modified rods was hardly influenced by the presence of such a small amount of ethanol. We hypothesized that the role of ethanol is to switch off an effective sticky interaction between modified CaCO 3 rods, by partitioning into the fatty acid layer at the particle surface and improving its swelling in water.…”

Engineering macroporous composite materials using competitive adsorption in particle-stabilized foams

“…Particles stabilize foam interfaces most effectively when they are partially wetted, that is when h is in the range of 43-90° [44][45][46][47][48][49]25,41]. To achieve this effect, inherently hydrophilic (h < 90 ) ceramic particles can be surface-modified with hydrophobic groups to obtain effective h values suitable for stabilizing aqueous foams [23][24][25], while the contact angles of inherently hydrophobic (hi90°) polymeric particles can be reduced by changing the surface tension of the liquid phase, i.e.…”

A New Class of Engineering Materials: Particle-Stabilized Metallic Emulsions and Monotectic Alloys

“…[1] However, once the droplets are nucleated, they immediately approach each other and coalesce under the influence of gravity or the interfacial gradient force, making the production of monotectic alloys with homogeneously distributed second phase almost impossible, especially for thick castings with considerable cooling times. [2][3][4][5][6] Here, we show for the first time that solid particles with appropriate wettability can be used to stabilize liquid metallic emulsions, opening a principally new route to produce thick wall monotectic alloys with homogeneously distributed second-phase droplets (particles).There has been common knowledge in colloid chemistry for more than a century [7] regarding how to stabilize water-or oil-based liquid foams [8][9][10][11][12][13][14][15][16][17] and emulsions [13,[18][19][20][21][22] by solid particles. On the other hand, solid particle-stabilized metallic foams [23][24][25][26][27][28] were originally discovered quite empirically by metallurgists and independently from the aforedescribed common knowledge of colloid chemists.…”

“…[7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Figure 2(c) is a theoretical emulsion stability diagram [20] for particle-stabilized emulsions. One can see that the contact angle (H) and the liquid-phase ratio (/ B ) are the two independent parameters that determine whether, in the given three-phase (liquid A + liquid B + solid C) combination of materials, any emulsion can be stabilized, and, if yes, the stable emulsion type (A droplets in B matrix, or vice versa).…”

“…There has been common knowledge in colloid chemistry for more than a century [7] regarding how to stabilize water-or oil-based liquid foams [8][9][10][11][12][13][14][15][16][17] and emulsions [13,[18][19][20][21][22] by solid particles. On the other hand, solid particle-stabilized metallic foams [23][24][25][26][27][28] were originally discovered quite empirically by metallurgists and independently from the aforedescribed common knowledge of colloid chemists.…”