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The resolution of the features depends on the quality of the employed photomask and the illumination system. However, a resolution down to few microns is readily achievable. Another important property that can limit the dimensions of the microfabricated hydrogel constructs is their aspect ratio (i.e., the ratio between their height and width).
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The grafted product HPG-g-PAM showed best results as a flocculant for kaolin, silica and iron ore suspension which was even better than the commercial flocculants. Nayak et al. in 2002, synthesized hydroxypropyl guar gum-grafted-polyacrylamide by ceric ion induced redox polymerization technique.
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The results indicated that the copolymer exhibited: (1) a good dewatering efficiency over a wide pH range of 3.0-11.0, (2) superior sludge dewatering performance compared to those of polyaluminum chloride (PACl), polyacrylamide (PAM), ferric chloride, and (3) a discontinuous surface with many channels or voids that helps to mobilize the
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