Yıldırım, Ender

Yıldırım, Ender

Profile URL

https://hdl.handle.net/20.500.12416/9214

Name Variants

Yıldırım, Ender
Yıldırım, E.
Yıldırım, Ender
Yildirim, Ender
Yıldırım, Ender
Yıldırım, Ender

Job Title

Doç. Dr.

Main Affiliation

06.06. Makine Mühendisliği
06. Mühendislik Fakültesi
01. Çankaya Üniversitesi
06.06. Makine Mühendisliği
Makine Mühendisliği
06. Mühendislik Fakültesi
01. Çankaya Üniversitesi

Status

Former Staff

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Sustainable Development Goals

13

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8

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3

GOOD HEALTH AND WELL-BEING

0

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15

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17

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14

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4

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11

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6

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10

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9

INDUSTRY, INNOVATION AND INFRASTRUCTURE

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12

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1

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2

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1

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7

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5

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16

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This researcher does not have a Scopus ID.

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Scholarly Output

22

Articles

13

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1271/47

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0

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0

WoS Citation Count

230

Scopus Citation Count

262

WoS h-index

9

Scopus h-index

10

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0

WoS Citations per Publication

10.45

Scopus Citations per Publication

11.91

Open Access Source

4

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0

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Journal	Count
10th Aegean Analytical Chemistry Days	2
Sensors and Actuators B: Chemical	2
21st International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2017 -- 21st International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2017 -- 22 October 2017 through 26 October 2017 -- Savannah -- 157376	1
23rd International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2019 -- 23rd International Conference on Miniaturized Systems for Chemistry and Life Sciences, MicroTAS 2019 -- 27 October 2019 through 31 October 2019 -- Basel -- 163704	1
7th European Conference on Antennas and Propagation (EuCAP) -- APR 08-12, 2013 -- Gothenburg, SWEDEN	1

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Scholarly Output Search Results

Now showing 1 - 10 of 22

Phaseguide Assisted Liquid Lamination for Magnetic Bead-Based Assays
(Chemical and Biological Microsystems Society, 2013) Phurimsak, C.; Yıldırım, Ender; Yildirim, E.; Trietsch, S.J.; Hankemeier, T.; Tarn, M.D.; Pamme, N.; Vulto, P.; Makine Mühendisliği
We demonstrate a simple, pump-free platform for performing rapid magnetic bead-based processes via their transfer through sequentially laminated liquid streams, made possible by the use of phaseguide technology. We have applied this strategy to two on-chip assays: (i) a streptavidin-biotin binding assay, and (ii) a sandwich immunoassay for the detection of C-reactive protein (CRP). Here, functionalized magnetic beads were pulled through alternating lanes of reagents and buffer solution, allowing multiple binding and washing processes to be reduced into a single step, significantly shortening procedural times compared to conventional multi-step bead-based assays.
Citation - WoS: 22
Citation - Scopus: 22
Phaseguide Assisted Liquid Lamination for Magnetic Particle-Based Assays
(Royal Soc Chemistry, 2014) Yildirim, Ender; Tarn, Mark D.; Trietsch, Sebastiaan J.; Hankemeier, Thomas; Pamme, Nicole; Vulto, Paul; Phurimsak, Chayakom
We have developed a magnetic particle-based assay platform in which functionalised magnetic particles are transferred sequentially through laminated volumes of reagents and washing buffers. Lamination of aqueous liquids is achieved via the use of phaseguide technology; microstructures that control the advancing air-liquid interface of solutions as they enter a microfluidic chamber. This allows manual filling of the device, eliminating the need for external pumping systems, and preparation of the system requires only a few minutes. Here, we apply the platform to two on-chip strategies: (i) a one-step streptavidin-biotin binding assay, and (ii) a two-step C-reactive protein immunoassay. With these, we demonstrate how condensing multiple reaction and washing processes into a single step significantly reduces procedural times, with both assay procedures requiring less than 8 seconds.
Simultaneous Detection of Two Different Bacteria Using QDs and MNPs
(2016) Doğan, Üzeyir; Kasap, Esin Nagihan; Çoğun, Ferah; Yıldırım, Ender; Çetin, Demet; Suludere, Zekiye; Boyacı, İsmail Hakkı; Ertaş, Nusret; Tamer, Uğur
Citation - WoS: 43
Citation - Scopus: 55
A Normally Closed Electrostatic Parylene Microvalve for Micro Total Analysis Systems
(Elsevier Science Sa, 2012) Arikan, M. A. Sahir; Kulah, Haluk; Yildirim, Ender
This paper presents an electrostatically actuated, normally closed microvalve for parylene microfluidics. The proposed valve structure isolates the fluid from the electric field, and hence results in relatively low actuation potentials (<60 V) irrespective of the working fluid. Hereby, the microvalve solves electrolysis or electrode shielding problems observed in electrostatic actuation in micro total analysis systems. To investigate leakage properties, microvalves were tested under pressurized flow with de-ionized (DI) water. No detectable leakage ratio was observed up to 20 kPa inlet pressure, due to the unique semicircular valve seat design. It was shown that the valve seat could be reconfigured to enable sealing at various pressure levels for different applications. (C) 2012 Elsevier B.V. All rights reserved.
Citation - WoS: 11
Citation - Scopus: 14
Numerical Study on Effects of Computational Domain Length on Flow Field in Standing Wave Thermoacoustic Couple
(Elsevier Sci Ltd, 2019) Turkoglu, Hasmet; Mergen, Suhan; Yildirim, Ender
For the analysis of thermoacoustic (TA) devices, computational methods are commonly used. In the computational studies found in the literature, the flow domain has been modelled differently by different researchers. A common approach in modelling the flow domain is to truncate the computational domain around the stack, instead of modelling the whole resonator to save computational time. However, where to truncate the domain is not clear. In this study, we have investigated how the simulation results are affected by the computational domain length (I-d) when the truncated domain approach is used. For this purpose, a standing wave TA couple which undergoes a refrigeration cycle was considered. The stack plate thickness was assumed to be zero and the simulations were performed for six different dimensionless domain length (I-d/lambda) varying between 0.029 and 0.180. Frequency and Mach number were taken as 100 Hz and 0.01, respectively, and kept constant for all the cases considered. The mean pressure and the pressure amplitude were taken as 10 kPa and 170 Pa, respectively (Drive ratio of 1.7%). Helium was considered as the working fluid. To assess the accuracy of the simulation results, the pressure distributions across the domain were compared with that of the standing wave. In addition to the pressure variation, the effects of the domain length on the phase delay of the pressure and velocity waves along the stack plate were also investigated. The results showed that with the increasing I-d/lambda. ratio, the simulated pressure distribution compares better with the standing wave pressure distribution. With the lowest I-d/lambda ratio (0.029) considered, the difference between the amplitudes of the computed pressure distribution and theoretical standing wave pressure distribution was approximately 50 Pa. However, as I-d/lambda value increases, the simulation results approach to the theoretical standing wave pressure distribution better. The computational results obtained with Id/lambda = 0.132 and 0.180, were almost identical with standing wave acoustic field. Hence, it was concluded that the domain length has a significant effect on the accuracy of the computational results when the truncated domain approach is used. It was also observed that for a given TA device and operating parameters, there is a minimum I-d/lambda value for obtaining reliable results.
MEMS Malzeme karakterizasyonu için bütünleşik bir elektrostatik mikro bükülme test yapısı tasarımı ve gerçekleştirilmesi
(Çankaya Üniversitesi, 2012) Yıldırım, Ender; Akın, Tayfun; Arıkan, M. A. Sahir
Mikro elektromekanik sistemlerde kullanılan malzemelerin mekanik özelliklerinin, üretim yöntemleri nedeniyle, mikro boyuttaki test yapılarıyla tespit edilmesi gerekmektedir. Bu çalışmada, eyleyici, test numunesi ve ölçüm skalası tek bir yonga üzerinde bütünleşik olarak üretilmiş bir mikro bükülme test yapısı sunulmaktadır. Tüm bileşenlerin bütünleşik olarak üretilmiş olması, benzer sistemlerde gözlenen hizalama problemini ortadan kaldırmaktadır. Yapı, iki uçtan ankastre mesnetli bir test kirişinin orta noktasından tarak tipi bir elektrostatik eyleyici ile çekilmesi esasına dayanmaktadır. Bükülme miktarı, ölçüm skalası üzerinden, görüntü işleme yöntemleri kullanılarak tespit edilmektedir. Tasarlanan yapılar yalıtkan-üzeri-silisyum pullar kullanılarak üretilmiştir. Testler sonucunda, literatürde belirtilen sonuçlarla uyumlu olarak, silisyum elastik modülü 136 GPa olarak belirlenmiştir
Citation - WoS: 12
Citation - Scopus: 13
A Reconfigurable Microfluidic Transmitarray Unit Cell
(Ieee, 2013) Erdil, Emre; Yıldırım, Ender; Topalli, Kagan; Zorlu, Ozge; Toral, Taylan; Yildirim, Ender; Kulah, Haluk; Civi, Ozlem Aydin; Makine Mühendisliği
This paper presents a novel microfluidics based approach to develop a reconfigurable circularly polarized transmitarray unit cell. The unit cell comprises double layer nested split ring slots formed as microfluidic channels that can be filled by fluids. Split regions in the slots are realized by injecting liquid metal into the channels. Beam steering is obtained by implementing rotational phase shifting via manipulating the liquid metal in the slots. X-band unit cell prototypes are fabricated on glass substrate carrying a patterned metal film, and the slot channels are formed by Polydimethylsiloxane (PDMS) using soft lithography techniques.
Citation - WoS: 7
Citation - Scopus: 8
A Novel Zero-Dead Sample Loading Interface for Microfluidic Devices: Flexible Hydraulic Reservoir (Fhr)
(Iop Publishing Ltd, 2018) Cetin, Barbaros; Yildirim, Ender; Hatipoglu, Utku
Infusing minute amounts of valuable liquids such as samples to microfluidic chips by using common pumping schemes such as syringe pumps often result in an excessive dead-volume. We present a simple yet effective sample loading interface, which helps by pumping the sample to the chip by using the hydraulic pressure generated by the syringe pump. Results show that sample volumes as low as 25 mu l can be delivered at flow rates ranging between 10-30 mu l min(-1). Maximum dead volume ratio was observed to be 3% when infusing 200 mu l of sample at 10 mu l min(-1).
Microchip Based Determination of Bacteria by In Chip Sandwich Immunoassay International Multidisciplinary Symposium on Drug Research and Development
(2015) Kasap, Esin; Çoğun, Ferah; Yıldırım, Ender; Boyacı, İsmail Hakkı; Çetin, Demet; Suludere, Zekiye; Tamer, Uğur; Ertaş, Nusret
Citation - WoS: 30
Citation - Scopus: 33
Investigation on Replication of Microfluidic Channels by Hot Embossing
(Taylor & Francis inc, 2017) Arikan, M. A. Sahir; Cogun, Ferah; Yildirim, Ender
In this study, effects of embossing temperature, time, and force on production of a microfluidic device were investigated. Polymethyl methacrylate (PMMA) substrates were hot embossed by using a micromilled aluminum mold. The process parameters were altered to observe the variation of replication rate in width and depth as well as symmetry of the replicated microfluidic channels. Analysis of variance (ANOVA) on the experimental results indicated that embossing temperature was the most important process parameter, whereas embossing time and force have less impact. One distinguishing aspect of this study is that, the channels were observed to be skewed to either side of the channel depending on the location of the protrusions on the mold. The mechanism of the skewness was investigated by finite element analysis and discussed in detail. Results showed that the skewness depends on the flow characteristics of the material and could be reduced by increasing the embossing temperature. The best replication rates were obtained at parameter settings of 115 degrees C, 10kN, and 8min for the molds with minimum 56 mu m wide features of 120 mu m depth. We also showed that the fabricated channels could be successfully sealed by solvent-assisted thermo-compressive bonding at 85 degrees C under 5.5kN force.

Yıldırım, Ender

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Sustainable Development Goals

13

CLIMATE ACTION

0

Research Products

8

DECENT WORK AND ECONOMIC GROWTH

0

Research Products

3

GOOD HEALTH AND WELL-BEING

0

Research Products

15

LIFE ON LAND

0

Research Products

17

PARTNERSHIPS FOR THE GOALS

0

Research Products

14

LIFE BELOW WATER

0

Research Products

4

QUALITY EDUCATION

0

Research Products

11

SUSTAINABLE CITIES AND COMMUNITIES

0

Research Products

6

CLEAN WATER AND SANITATION

0

Research Products

10

REDUCED INEQUALITIES

0

Research Products

9

INDUSTRY, INNOVATION AND INFRASTRUCTURE

0

Research Products

12

RESPONSIBLE CONSUMPTION AND PRODUCTION

1

Research Products

2

ZERO HUNGER

0

Research Products

1

NO POVERTY

0

Research Products

7

AFFORDABLE AND CLEAN ENERGY

0

Research Products

5

GENDER EQUALITY

0

Research Products

16

PEACE, JUSTICE AND STRONG INSTITUTIONS