Article
Chemistry, Analytical
Michelle Hadad, Nadine Hadad, Alexander G. Zestos
Summary: In this study, a method for measuring cortisol using carbon fiber microelectrodes and fast-scan cyclic voltammetry was developed. This method showed high sensitivity, high spatiotemporal resolution, and biocompatibility, and it was able to detect cortisol stably. Its application will contribute to a better understanding of the physiological importance of cortisol.
Article
Chemistry, Physical
Karla Caroline de Freitas Araujo, Emily Cintia Tossi de Araujo Costa, Danyelle Medeiros de Araujo, Elisama V. Santos, Carlos A. Martinez-Huitle, Pollyana Souza Castro
Summary: In the development of electrochemical sensors, carbon micro-structured or micro-materials have been widely used as supports/modifiers to improve the performance of bare electrodes. However, no attempts for electroanalytical determination of caffeine with CF microelectrode have been reported in the literature. Therefore, a homemade CF-microelectrode was fabricated and used to determine caffeine in soft beverage samples.
Article
Biophysics
Elisa Castagnola, Raghav Garg, Sahil K. Rastogi, Tzahi Cohen-Karni, Xinyan Tracy Cui
Summary: The newly developed three-dimensional fuzzy graphene microelectrode arrays show high sensitivity and stability for dopamine detection, enabling multi-site detection in the brain and potentially improving treatments and understanding of neurological disorders.
BIOSENSORS & BIOELECTRONICS
(2021)
Article
Biophysics
Mingyi Xia, Busra Nur Agca, Tomoko Yoshida, Jiwon Choi, Usamma Amjad, Kade Bose, Nikol Keren, Shahar Zukerman, Michael J. Cima, Ann M. Graybiel, Helen N. Schwerdt
Summary: We developed a flexible electrode-thread array for recording dopamine neurochemicals from multiple subcortical targets, which has the potential for various applications in neuroscience and clinical treatment.
BIOSENSORS & BIOELECTRONICS
(2023)
Article
Chemistry, Physical
Qizhang Jia, Cheng Yang, B. Jill Venton, Kateri H. DuBay
Summary: This study utilizes molecular dynamics simulations to investigate the surface diffusion of dopamine on graphene. The findings suggest that dopamine rapidly adsorbs to the surface and diffuses quickly, with its vertical placement influenced by charge.
Article
Polymer Science
Bipin S. Chikkatti, Ashok M. Sajjan, Prakash B. Kalahal, Nagaraj R. Banapurmath, T. M. Yunus Khan, Shaik Dawood Abdul Khadar, Shaik Mohamed Shamsudeen, A. B. Raju
Summary: This study prepares polymer gel electrolytes using poly (vinyl alcohol) (PVA) and tetraethylorthosilicate (TEOS) and optimizes their concentration for valve-regulated lead-acid batteries. The optimized gel electrolyte shows high capacity and cycle performance, making it a promising candidate for practical battery applications.
Article
Materials Science, Multidisciplinary
Nuria Borras, Margarita Sanchez-Jimenez, Jordi Casanovas, Carlos Aleman, Maria M. Perez-Madrigal
Summary: When danger is perceived, the human body responds by releasing stress hormones to help overcome obstacles and ensure survival. However, prolonged exposure to stress can lead to health disorders and reduced quality of life. Therefore, it is important to monitor stress biomarkers to quantitatively control stress levels. In this study, a porous sensor composed of PEDOT and COP is developed to detect the stress biomarkers dopamine (DA) and serotonin (5-HT). The sensor exhibits low detection limits and high sensitivity when tested in artificial urine and phosphate-buffered saline. The interaction patterns between the biomarkers and the sensor material are elucidated through theoretical calculations. Overall, the 4l-COP/p electrodes show promising potential as stress sensing devices in healthcare technologies.
MACROMOLECULAR MATERIALS AND ENGINEERING
(2022)
Article
Energy & Fuels
Bipin S. Chikkatti, Ashok M. Sajjan, Prakash B. Kalahal, Nagaraj R. Banapurmath
Summary: This research work presents a novel gel system using poly(vinyl alcohol) and poly(4-styrene sulfonic acidco-maleic acid) sodium salt for VRLA batteries, which shows high electrochemical performance and capacity retention over 500 cycles.
JOURNAL OF ENERGY STORAGE
(2023)
Review
Chemistry, Analytical
Cailing He, Mengdan Tao, Chenxi Zhang, Yifang He, Wei Xu, Yan Liu, Wanying Zhu
Summary: Dopamine is an essential neurotransmitter in the central nervous system and its abnormal metabolism is related to various diseases. Electrochemical sensing technology, particularly with microelectrodes, is recognized as the most effective method for measuring neurotransmitters in vivo. This article reviews recent applications and research on microelectrodes for dopamine detection in vivo, highlighting the advantages of high sensitivity and spatial resolution.
CRITICAL REVIEWS IN ANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
Hande Eserci Gurbuz, Ezel Oztuerk Gunduz, Merve Bat-Ozmatara, Ahmet Senocak, Elif Okutan
Summary: Three new BODIPY dyes decorated with CB moieties were synthesized and characterized. The presence of CB units conferred unique biological features to the dyes, while BODIPY state luminescent molecules thanks to their photophysical properties. The synthesized compounds were confirmed through various spectroscopic techniques and their photophysical processes were investigated. The CB-BODIPY derivatives showed superior antibacterial activity against Gram-positive and Gram-negative bacteria.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Biochemistry & Molecular Biology
Suguna Perumal, Raji Atchudan, Thomas Nesakumar Jebakumar Immanuel Edison, Jae-Jin Shim, Yong Rok Lee
Summary: In this study, a one-step in situ polymerization method was used for the noncovalent functionalization of a graphene surface with poly-N-vinyl-2-pyrrolidone (PNVP) and the exfoliation of graphite into graphene sheets. Various characterization techniques were utilized to confirm the successful formation of the GPNVP composite and functionalization of the graphene surface. The GPNVP composite exhibited excellent rate capability with capacitive properties, making it an ideal candidate for various electrochemical applications.
Article
Biochemical Research Methods
Noel Manring, Muzammil M. N. Ahmed, Jessica L. Smeltz, Pavithra Pathirathna
Summary: The etiology of neurodegenerative diseases is poorly understood and the heavy metal copper has been found to play a critical role in neurotoxicity, affecting the development of these diseases. Analyzing heavy metals in the brain is challenging due to the limitations of existing metal detection tools, resulting in inadequate data for developing efficient therapeutics. This study developed a surface-modified electrode using fast-scan cyclic voltammetry to detect ultra-low concentrations of copper in the brain accurately and in real time.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Review
Chemistry, Physical
Stephane Marinesco
Summary: Chemical transmission between neurosecretory cells is a central biological phenomenon that can be studied using electrochemical techniques. Carbon fiber microelectrodes are commonly used to detect neurotransmitters and can be modified for specific and sensitive in situ neurotransmitter detection, making them an essential tool for analyzing living cells and tissues.
CURRENT OPINION IN ELECTROCHEMISTRY
(2021)
Article
Electrochemistry
Encarnacion Torralba, Eduardo Laborda, Angela Molina, Christine Cachet-Vivier, Stephane Bastide
Summary: Cavity microelectrodes (CMEs) provide a valuable platform for evaluating the electrocatalytic performance of micro- and nanoparticulate materials; experiments show capacitive distortion increases with powder surface area, but faradaic response mainly occurs on the first layer of the powder load, cyclic voltammetry and square wave voltammetry (SWV) are suitable for discriminating faradaic processes at CMEs.
Article
Chemistry, Multidisciplinary
Hareesha Nagarajappa, Jamballi G. Manjunatha, Abdullah A. Al-Kahtani, Ammar M. Tighezza, Narges Ataollahi
Summary: The bare carbon nanotube paste electrode (BCNTPE) can be chemically modified for selective determination of riboflavin (RF) in the presence of dopamine (DA). A poly(titan yellow) modified carbon nanotubes paste electrode (PTYMCNTPE) was constructed using a simple and eco-friendly procedure and showed high electrocatalytic activity for the redox reaction of RF. The proposed sensor has great potential for the determination of RF in pharmaceutical samples.
Article
Polymer Science
Ozan Yoruk, Yuksel Bayrak, Murat Ates
Summary: Superior performance of a ternary nanocomposite material consisting of TiO2 and rGO, added to PANI, was observed through various analysis and tests, showing enhanced specific capacitance, energy density, power density, and cycle life compared to individual components.
Review
Polymer Science
Murat Ates, Ozge Kuzgun, Idris Candan
Summary: This review article discusses the research and technological advancements of titanium-based materials in supercapacitors, with a focus on titanium carbide, titanium nitride, and titanium dioxide. It also highlights the various factors influencing the electrochemical performance of supercapacitor devices, and provides insights into future prospects and challenges in the field.
IRANIAN POLYMER JOURNAL
(2022)
Article
Materials Science, Multidisciplinary
Murat Ates, Ozan Yoruk, Yuksel Bayrak
Summary: In this study, a simple and cost-effective preparation method of rGO/Co3O4 nanocomposite was proposed. The electroactive materials were characterized by various techniques, and the nanocomposite showed excellent electrochemical performance at different monomer concentrations.
MATERIALS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Keziban Huner, A. Sezai Sarac
Summary: This study demonstrated the impact of solvent dielectric constant on the electrochemical coating of polymers. The highest specific and double layer capacitance values were achieved in a medium with a dielectric constant of 64.9, with capacitance values decreasing as the dielectric constant decreased. PEDOT exhibited more capacitive behavior than poly(EDOT-co-pTSP), particularly at lower frequencies.
BULLETIN OF MATERIALS SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Baran Sarac, Vladislav Zadorozhnyy, Yurii P. Ivanov, Florian Spieckermann, Semen Klyamkin, Elena Berdonosova, Mikhail Serov, Sergey Kaloshkin, A. Lindsay Greer, A. Sezai Sarac, Jurgen Eckert
Summary: The high entropy alloy Ti20Zr20Nb15V15Hf15Ta15 shows ultra-high corrosion resistance in alkaline environment, potential for hydrogen electrocatalysis, significant hydrogen storage capacity, as well as high corrosion resistance in acidic and saline environments, making it suitable for various applications.
Article
Chemistry, Physical
Baran Sarac, Yurii P. Ivanov, Tolga Karazehir, Marlene Muehlbacher, A. Sezai Sarac, A. Lindsay Greer, Jurgen Eckert
Summary: The multilayer amorphous and crystalline Pd-Si based nanosheets demonstrate exceptionally high hydrogen storage capabilities when stacked in the right order, offering potential for enhanced hydrogen storage and production through smart design applications.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Electrochemistry
M. Giray Ersozoglu, Hurmus Gursu, Selin Gumrukcu, A. Sezai Sarac, Yucel Sahin
Summary: The aim of this study is to convert commercial carbon fiber into heteroatom-doped graphene-like surfaced fibers through an eco-friendly and fast intercalation/semi-exfoliation mechanism, and to improve the hydrogen evolution reaction performance of the catalyst.
Article
Materials Science, Multidisciplinary
B. Sarac, T. Karazehir, E. Yuece, M. Muehlbacher, A. S. Sarac, J. Eckert
Summary: This study focuses on tuning the pore architecture and film thickness of mesoporous Pd-Cu-Si thin films sputtered on Si/SiO2 substrates to enhance their electrocatalytic and hydrogen sorption/desorption activities. The different thicknesses and pore diameters of the electrocatalysts show varying hydrogen sorption performance and electrocatalytic activity, making them applicable for standard fuel cells and rapid storage systems. The charge transfer resistance as described by an equivalent circuit model shows a strong correlation with Tafel slopes, indicating the potential utility of the thin films as nano-chargers and hydrogen sensors.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Baran Sarac, Tolga Karazehir, Hans-Detlev Gilsing, Juergen Eckert, A. Sezai Sarac
Summary: The interactions between the electrolyte and electroactive species in redox active PProDOT derivatives are enhanced by better-performing electrodes for electrochemical energy conversion and storage. A new equation is proposed to assess the kinetics of the diffusion-limited adsorption process, and electron-donating groups attached to the monomer stabilize radical cation and dication formation. The findings of this study provide new insights into the factors requiring attention in tailoring assemblies for organic electronic applications.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2022)
Article
Polymer Science
Rumeysa Beyaz, Aysun Ekinci, Zuhal Yurtbasi, Mustafa Oksuz, Murat Ates, Ismail Aydin
Summary: The effects of metal and carbon based fillers on the properties of Polyamide 6,6 were investigated in this study. The results showed that the electrical and thermal conductivity as well as the mechanical properties of the composites were improved with the use of fillers. The hybrid fillers further enhanced the mechanical properties of the composites.
HIGH PERFORMANCE POLYMERS
(2023)
Review
Polymer Science
Murat Ates, Selin Karadag, Aysegul Akdogan Eker, Bulent Eker
Summary: This review article presents the industrial applications of polyurethane (PU) foam materials. PU foams have been used to replace metals and plastics in various engineering applications by combining the hardness and durability of metal with the flexibility of rubber. Different compositions and chemical factors can be used to synthesize PU foams with specific properties for different applications.
POLYMER INTERNATIONAL
(2022)
Article
Polymer Science
Aysun Ekinci, Mustafa Oksuz, Murat Ates, Ismail Aydin
Summary: This study investigates the effects of PP-g-MA compatibilizer on the thermal and mechanical properties of PP/rPET blends. The results show that increasing the amount of PP-g-MA improves the interfacial interactions between the polymers and enhances the strength and modulus of the blends.
JOURNAL OF POLYMER RESEARCH
(2022)
Article
Automation & Control Systems
Busra Al Menen, Aysun Ekinci, Mustafa Oksuz, Murat Ates, Ismail Aydin
Summary: The study investigated the effect of processing parameters on the properties of deflector parts made from a combination of recycled polypropylene (rPP) and ethylene propylene diene monomer (EPDM) through a two-component injection molding process. Post-industrial waste PP was used in varying amounts in the rPP/EPDM parts, and the dimensional, mechanical, thermal, and morphological properties of the parts were analyzed. The results showed that the dimensional stability and adhesion between rPP and EPDM were influenced by the processing parameters.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Polymer Science
Murat Ates, Ceylin Alperen
Summary: Polythiophene (PTh), reduced graphene oxide (rGO), and graphene oxide (GO) nanocomposites with carbon black (CB) have been synthesized and show promising potential for supercapacitors. The nanocomposites exhibit high electrical conductivity and specific capacitance, with the rGO/PTh/CB composite achieving the highest capacitance retention, energy density, and power density. The addition of PTh and CB to the GO material significantly increases the specific capacitance. This study demonstrates the successful use of rGO/PTh/CB nanocomposites for supercapacitor technology.
IRANIAN POLYMER JOURNAL
(2023)
Article
Chemistry, Physical
Tolga Karazehir, Baran Sarac, Hans-Detlev Gilsing, Selin Gumrukcu, Jurgen Eckert, A. Sezai Sarac
Summary: By studying the relationship between the electropolymerization and capacitive properties of poly(3,4-propylenedioxythiophene) derivatives, it is found that the substituents can influence the crystal structures and conductivity of the polymers.
MOLECULAR SYSTEMS DESIGN & ENGINEERING
(2021)
