03234nas a2200361 a 4500 20260818213706.0 230831s2013 th m rtt 0| eng d .b12411814 AIT Diss no.ISE-13 Nazir, Aneeqa Sabah Self organization of charge stabilized gold nanoparticles on directed fungal mycelia directed by external stimuli Pathum Thani, Thailand : Asian Institute of Technology, 2013 94 p. : ill. + 1 online resource Dissertation ; no. ISE-13 A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Nanotechnology Thesis (Ph.D.) - Asian Institute of Technology, 2013 Aligned and structured point-to-point biomimetic microwires growth was attempted by controlled integration of microbial tropism and self-organization of metallic nanoparticles (glutamate capped gold colloids) on living template of Aspergillus niger (A. niger) hyphae. Ajinomoto® (MSG) served as the stabilizing and reducing agent for gold colloid nanoparticles and also acted as a source of nutrients for the growth of fungal hyphae. Because the tips of growing fungi are sensitive to surrounding physical or chemical environmental changes, fabrication of polarized micro-assemblies were made possible by the application of various tropic factors like visible light, nutrient flow, temperature, relative humidity (rH) as well as physical contact and gravity. Gold microwires fabricated in this way had length beyond 1mm and of about 1 to 2 om diameter. These wires showed the maximum divergence of 40⁰-50⁰ from the light path irrespective of different illuminated colour and displayed wide variation in dimension and morphology. Fungal growth in terms of hyphal length, branched intensity as well as re-orientation was analyzed statistically. Optical modeling was done successfully to visualize the phototropic response of fungal templated gold microwires towards different wavelengths. Whereas, thigmotropism and gravisensing did not show demonstrable patterning of templated wires under the same conditions. To the best of our knowledge, this is first time that the application of tropism and self-organization on living entities were used in conjunction to pattern the mesh of ultrathin, small, and robust microwires having high surface area for potential applications in sensing, catalysis, electronic and optical industry. Nanoparticles Gold Organization Change Dutta, Joydeep, Chairperson Hornyak, Gabor L., Examination committee Anal, Anil Kumar, Examination Committee Kumar, Prabhat, Examination committee Lahore College for Women University, Pakistan, Scholarship donor Asian Institute of Technology Fellowship, Scholarship donor Asian Institute of Technology. Dissertation ; no. ISE-13 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B06132 .b12411814 mnait m 240419 0 230831 m a m 0 105685 105685