Yazar "Akcan, O. Gokalp" seçeneğine göre listele

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    A disposable MEMS biosensor for aflatoxin M1 molecule detection
    (Elsevier Science Sa, 2022) Erdil, Kuter; Akcan, O. Gokalp; Gul, Ozguer; Gokdel, Y. Daghan
    In this work, a paper-based perforated disposable biosensing device is proposed as an alternative method for aflatoxin M1 molecule detection. The demonstrated system is designed to achieve a quick and novel biosensing operation with low-cost materials using competitive assay method. For that purpose, the main fabrication material has opted as a 190 izm thick filter paper. 50 izm thick piezoresistive graphite paste is coated onto both sides of the paper-based cantilever beam with the aim of acquiring more sensitive magnetic nanoparticle weight sensing capability. Additionally, the structure has arrays of closely spaced perforations to augmented effective Young's modulus of the cantilever beam and further increase the system's sensitivity. An electrocoil positioned 1 mm below the sensor tip to apply an H(ext )and magnetically increase weight of the aflatoxin M1 with bovine serum albumin compound. An electronic read-out circuitry is implemented and integrated into the system. Average values of sensitivity and limit of detection (LoD) for each detection approach were calculated without blank subtraction and are shown with the standard error of the mean (SEM). LoD is calculated as 4.63 izg AFM1 which corresponds to 0.20127 V/V after subtracting standard deviation from the average value. It is experimentally demonstrated that the proposed system can detect a minimum of 14 izg of AFM1 molecules (0.14155 V/V). We magnetically amplified this tiny fragment of targeted molecules approximately 2731 times to 38.237 mg and made it detectable even with a disposable system. The sensitivity of the proposed system is 45.953 izV/mg. Finally, the maximum detectable AFM1 weight is reported as 71 izg.
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    Flexible Linear Absolute Encoder System for Force Localization in Soft Environments
    (IEEE, 2020) Erdil, Kuter; Korkut, Dogukan; Akcan, O. Gokalp; Muslu, Batin; Gokdel, Y. Daghan; Baran, Eray A.
    This paper proposes a novel disposable linear absolute encoder system and its peripheral electronic readout circuitry to be used for the localization of force in a continuum media such as a flexible robotic arm. The proposed structure relies on the design of graphite layers on a flexible surface that shows varying resistance based on the applied strain. The proposed topology can localize the force applied on a continuous paper based sensor having the geometry of an absolute encoder system. The successful results obtained from the experiments prove the efficacy of the proposed system while opening new paradigms for the possibility of contact force localization in flexible structures like soft robots.
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    Perforated Paper-Based Piezoresistive Force Sensor
    (IEEE, 2019) Erdil, Kuter; Ayrac, Tugce; Akcan, O. Gokalp; Gokdel, Y. Daghan
    In this work, a paper-based disposable piezoresistive force sensor has been designed, fabricated and tested along with peripheral electronic circuit. Strathmore (R) 400 series Bristol paper is employed as the substrate and it is coated with graphite and silver ink to form a perforated cantilever beam which constitutes the sensor part of the force sensing system. The proposed force sensing system can measure a force ranging to 24 mN with a force resolution of 196 mu N. The implemented sensor has a sensitivity of 8.63 mV/mN.
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    Silicone Mold Implementation for High-Sensitive Detection of Strain Sensing using Paper-Based Piezoresistive System
    (IEEE, 2020) Korkut, Dogukan; Erdi, Kuter; Akcan, O. Gokalp; Muslu, Batin; Baran, Eray A.; Gokdel, Y. Daghan
    This paper presents the design, fabrication, experimental results and related discussion of a portable bending enhancing silicone mold structure for biomedical applications in which a high-sensitive but low-cost force measurement structure with a large-dynamic range is required. Proposed system is composed of a replaceable parts like graphite coated Strathmore (R) 400 series Bristol paper and cheap RTV-2 silicone molds. The results shows that low-cost, portable and high-sensitive force and strain sensor systems can be realized for point-of-care biomedical applications in the future.