Kuasa magnet telah diperkenalkan sebagai salah satu kaedah untuk mengawal pengerakan mikroalga. Bagi membuat mikroalga menjadi magnetresponsif, polimer yang bercas positif , poli (diallyldimethylammonium klorida)) (PDDA) telah digunakan untuk menggalakkan lampiran berkesan zarah bersaiz nano besi oksida (IONPs) ke permukaan mikroalga, spesies Clamydomonas reinhardtii (spesies CR) melalui interaksi elektrostatik. Melalui eksperimen, didapati bahawa kelajuan daya berenang spesies CR yang bebas terletak antara 100 ᶙm/s hingga 128 ᶙm /s. Seterusnya, selepas pelekatan zarah bersaiz nano besi oksida kepada permukaan mikroalga, kelajuan daya berenang spesies CR dikurangkan secara drastic kepada 9 ᶙm /s hingga 29 ᶙm /s . Kelajun daya berenang dikurangkan lebih kurang 75.23% hingga 91.79% daripada purata kelajuan berenang spesies CR yang bergerak bebas. Ini disebabkan oleh pergerakan flagella telah diganggu oleh zarah bersaiz nano besi oksida yang melekat kepada flagella ataupun persekitaran flagella. Mengikut hukum pemuliharaan momentum, apabila IONPs melekat kepada mikroalga, peningkatan dalam jumlah jisim menyebabkan, pengurangan kelajuan renang spesies CR. Akhir sekali, apabila daya magnet digunakan, kelajuan renang spesies CR meningkat dengan kenaikan yang berbeza-beza dari 64.65% kepada 334.83% daripada kelajuan renang asalnya. Pergerakan mikroalga telah diarahkan ke arah sumber kuasa magnet.
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Magnetic force was introduced as one of the method to control the motion of microalgae. To make the microalgae become magnetically responsive, the cation polymer binder, poly (diallyldimethylammonium chloride) (PDDA) was used to promote the effective attachment of iron oxide nano particles (IONPs) onto the surface of microalgae, Clamydomonas Reinhardtii species (CR species) through electrostatic interaction. From the experiment, it was found that the swimming velocity of fresh CR species species is within 100 ᶙm/s to 128 ᶙm/s. Next, after the attachment of PDDA functionalized IONPs, the swimming velocity of CR species reduced drastically to only about 9 ᶙm/s to 29 ᶙm/s which around 75.23% to 91.79% of reduction from the average velocity of free moving CR species. This is because motion of the flagella is being distorted by PDDA functionalized IONPs. According to law of conservation of momentum, when IONPs attached to the microalgae, the increase in total mass caused its swimming velocity reduced. Lastly, when magnetic force is applied, the swimming velocity of targeted CR species with PDDA functionalized IONPs increased significantly with an increment vary from 64.65% to 334.83% of its original swimming velocity. The movement of microalgae is directed toward the source of magnetic force.
Biological motor to move loads at microscales- kinematic analysis / Ng Chyi Sean