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Topography of collagen/alginate (COL/ALG) Sx films. (A–C) Unstretched S0 films. (D–F) One hundred percent stretched S100 films. (A, D) Scanning electronic microscope (SEM) images. (B, E) Atomic force microscope (AFM) images. (C, F) Distribution of the fibril angle determined from AFM images. (A, B) The reference axis is parallel to the lower edge of the picture. (D, E) Arrows indicate the direction of stretching. Color images available online at www.liebertpub.com/tec
