Absorbency of water, acid and base in common household .ppt
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1、Absorbency of water, acid and base in common household products,Jessica Abrams,What determines Absorbency?,Surface Area: Larger surface area = greater absorbency. Porosity: Higher porosity = greater absorbency. Molecular Structure of Textile: Hydrophilic or hydrophobic,Initial Theory/Model,Water wil
2、l absorb into a material if there is room for it. Some materials have more room than others. Variable is described as porosity. Since different materials are made of different organic and synthetic constituents, the nature of these constituents will affect a materials absorption.,Porosity,The amount
3、 of space in a materialFor example, sponges are more porous than dish towels.,Material Constituents,Hydrophobic Lack of areas on the individual molecules of the material that can bond with the dissociated molecules of water. Hydrophilic Locations on molecules of material that can bond with dissociat
4、ed molecules of water.,Molecular Structure,Cotton: Polyester:,Initial Theory/Model,Part I: Materials with high porosity will absorb more water than materials with low porosity. Part II: Materials with more free H+ will absorb more base than water, and materials with more OH- will absorb more acid th
5、an water.,Methods,Acquired five different types of household materials and cut into 2 x 2” squares.,Then,Acquired 3 % acetic acid (vinegar) and 3 % base (hydrogen peroxide) Measured the weight of each item. Added water, acid or base to each item and weighed again,Conducted three trials for each item
6、 using acid, water and base. Calculated fluid absorption per gram of weight.,Porosities of Fabrics,Higher Porosity Lower Porosity100% 100% Cotton/ Acrylic Flannel Paper Polyester Cotton Poly Towel,Results Part I,100% Polyester absorbed more water per gram than other textiles,Materials with high poro
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