Impedance Measurement and Characterization of Ag-Ge30Se70-Based Programmable Metallization Cells

2014 ◽  
Vol 61 (11) ◽  
pp. 3723-3730 ◽  
Author(s):  
Debayan Mahalanabis ◽  
Yago Gonzalez-Velo ◽  
Hugh J. Barnaby ◽  
Michael N. Kozicki ◽  
Pradeep Dandamudi ◽  
...  
Keyword(s):  
Impedance Measurement ◽  
Programmable Metallization Cells ◽  
Metallization Cells

Fabrication and characterization of Cu2O/Cu-WO3 bilayers for lateral programmable metallization cells

2020 ◽  
Vol 527 ◽  
pp. 146899 ◽  
Author(s):  
Mehmet B. Balaban ◽  
Ninad Chamele ◽  
Smitha S. Swain ◽  
Yago Gonzalez-Velo ◽  
Michael N. Kozicki
Keyword(s):  
Fabrication And Characterization ◽  
Programmable Metallization Cells ◽  
Metallization Cells

(Invited) Programmable Metallization Cells in Memory and Switching Applications

2013 ◽  
Vol 58 (5) ◽  
pp. 47-52 ◽  
Author(s):  
M. N. Kozicki ◽  
P. Dandamudi ◽  
H. J. Barnaby ◽  
Y. Gonzalez-Velo
Keyword(s):  
Programmable Metallization Cells ◽  
Metallization Cells

scholarly journals Comprehensive label-free characterization of extracellular vesicles and their surface proteins

2020 ◽  
Author(s):  
E. Priglinger ◽  
J. Strasser ◽  
B. Buchroithner ◽  
F. Weber ◽  
S. Wolbank ◽  
...  
Keyword(s):  
Quality Control ◽  
Extracellular Vesicles ◽  
Impedance Measurement ◽  
Surface Proteins ◽  
Label Free ◽  
Neuroprotective Effects ◽  
Characterization Methods ◽  
Minimal Sample ◽  
Flow Filtration

AbstractInterest in mesenchymal stem cell derived extracellular vesicles (MSC-EVs) as therapeutic agents has dramatically increased over the last decade. Preclinical studies show that MSC-EVs have anti-apoptotic and neuroprotective effects, boost wound healing, and improve the integration of allogeneic grafts through immunomodulation. Current approaches to the characterization and quality control of EV-based therapeutics include particle tracking techniques, Western blotting, and advanced cytometry, but standardized methods are lacking. In this study, we established and verified quartz crystal microbalance (QCM) as highly sensitive label-free immunosensing technique for characterizing clinically approved umbilical cord MSC-EVs enriched by tangential flow filtration and ultracentrifugation. Using QCM in conjunction with common characterization methods, we were able to specifically detect EVs via EV (CD9, CD63, CD81) and MSC (CD44, CD49e, CD73) markers and gauge their prevalence. Additionally, we characterized the topography and elasticity of these EVs by atomic force microscopy (AFM), enabling us to distinguish between EVs and non-vesicular particles (NVPs) in a therapeutic formulation. This measurement modality makes it possible to identify EV sub-fractions, discriminate between EVs and NVPs, and to characterize EV surface proteins, all with minimal sample preparation and using label-free measurement devices with low barriers of entry for labs looking to widen their spectrum of characterization techniques. Our combination of QCM with impedance measurement (QCM-I) and AFM measurements provides a robust multi-marker approach to the characterization of clinically approved EV formulations and opens the door to improved quality control.

Application of AC Impedance Spectroscopy for Characterization of BiNbO4 Ceramics

2012 ◽  
Vol 512-515 ◽  
pp. 1193-1197 ◽  
Author(s):  
Agata Lisińska-Czekaj ◽  
Beata Wodecka-Duś ◽  
Dionizy Czekaj
Keyword(s):  
Impedance Spectroscopy ◽  
Least Squares Method ◽  
Complex Impedance ◽  
Impedance Measurement ◽  
Simulated Data ◽  
Electrode Processes ◽  
Usual Representation ◽  
Ac Response ◽  
Input Perturbation

Impedance spectroscopy is known as an important technique used for describing the electrical processes occurring in a system on applying an ac signal as input perturbation. In the present paper results of a study of BiNbO4 ceramics fabricated by mixed oxide method and sintered by free sintering are reported. Results on the ac response of the electroceramic samples by impedance spectroscopy at temperature T= 100 – 400 °C are given. The usual representation (i.e. Z” vs. Z’ where Z’ and Z” are the real and imaginary parts of the complex impedance, respectively) as well as the alternative representations of the impedance measurement (electrical modulus representation) was used to interpret the impedance spectra of BiNbO4 ceramics in order to obtain separate contributions of the bulk, grain boundary and electrode processes. The Kramers-Kronig data validation test was employed in the impedance data analysis. Experimental data of impedance spectroscopy were fitted to the corresponding equivalent circuit using the complex non-linear least squares method. Agreement between experimental and simulated data was established.

A CMOS-compatible electronic synapse device based on Cu/SiO2/W programmable metallization cells

2016 ◽  
Vol 27 (25) ◽  
pp. 255202 ◽  
Author(s):  
Wenhao Chen ◽  
Runchen Fang ◽  
Mehmet B Balaban ◽  
Weijie Yu ◽  
Yago Gonzalez-Velo ◽  
...  
Keyword(s):  
Cmos Compatible ◽  
Programmable Metallization Cells ◽  
Metallization Cells ◽  
Electronic Synapse
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