Y. Zhao, Tomiki Ikeda's Smart Light-Responsive Materials: Azobenzene-Containing PDF

By Y. Zhao, Tomiki Ikeda

ISBN-10: 0470175788

ISBN-13: 9780470175781

This booklet studies the state of the art major examine within the box of clever light-responsive fabrics in keeping with azobenzene polymers and liquid crystals. Emphasis is put on the invention of latest phenomena from the previous five years, their underlying mechanisms, new functionalities, and houses accomplished via rational layout. Edited via major experts within the box, Zhao and Ikeda, the chapters are authored by way of an internationally-recognized group of specialists from North the US, Europe, and Asia. clever Light-Responsive fabrics will serve to catalyze new study that would lead this box over the following 5-10 years.

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Sample text

To readout a page, the azo sample is set at the correct angle and illuminated with the reference beam. The resulting diffraction pattern is imaged on a charge-coupled device (CCD) array, which measures the encoded beam pattern (data). The volume of data and transmission rate is clearly large: projections of B1000 GB in a single disk have been made. Since the entire hologram image is stored throughout the material, the technique is fairly insensitive to dust, scratches, and pinpoint defects. , 1996).

Some azo polymers also form LC phases (refer to Fig. 6 for a typical structure). For side-chain azobenzenes, a certain amount of mobility is required for LC phases to be present; as a rule, if the tether between the chromophore and the backbone is less than 6 alkyl units long, the polymer will exhibit an amorphous and isotropic solid-state phase, whereas if the spacer is longer, LC phases typically form. , 2003; Ichimura, 2000). , 1991). , 2001). These changes are fast and reversible. Although the trans-azobenzenes are excellent mesogens, the cis-azos typically are not.

Photoregulation of polypeptide structure has been an active area of research (Ciardelli and Pieroni, 2001), with the azobenzenes making signi´Čücant contributions. , 1980), and poly(L-lysine) (Malcolm and Pieroni, 1990), among others, have been prepared. , 1987). Also, owing to the change in local electrostatic environment, the pKa of the polypeptides can be controlled in these systems. Covalent attachment of azobenzene units to enzymes can modify protein activity by distorting the protein structure with isomerization.

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Smart Light-Responsive Materials: Azobenzene-Containing Polymers and Liquid Crystals by Y. Zhao, Tomiki Ikeda

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