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Adsorption Electrochemistry

Mulugeta B Wayu, Michael J Pannell, Najwa Labban, William S Case, Julie A Pollock, Michael C Leopold
Modified electrodes featuring specific adsorption platforms able to access the electrochemistry of the copper containing enzyme galactose oxidase (GaOx) were explored, including interfaces featuring nanomaterials such as nanoparticles and carbon nanotubes (CNTs). Electrodes modified with various self-assembled monolayers (SAMs) including those with attached nanoparticles or amide-coupled functionalized CNTs were examined for their ability to effectively immobilize GaOx and study the redox activity related to its copper core...
February 2019: Bioelectrochemistry
Fernando Bresme, Oliver Robotham, Weng-I Katherine Chio, Miguel Angel Gonzalez, Alexei Kornyshev
Tetrabutylammonium (TBA) and tetraphenylborate (TPB) ions dissolved in dichloroethane (DCE) are widely used in electrochemistry of liquid-liquid interfaces. Unlike alkali halide solutions in water, TBA-TPB-DCE solutions feature large organic ions and a solvent with a dielectric constant almost one order of magnitude lower than that of water. This is expected to dramatically amplify the impact of ionic correlations in the properties of the solution. Here we report atomistic simulations of TBA-TPB-DCE solutions and analyze ion correlations, clustering, and charge screening effects...
November 7, 2018: Physical Chemistry Chemical Physics: PCCP
Leila Zarei, Roya Tavallaie, Moinul H Choudhury, Stephen G Parker, Padmavathy Bakthavathsalam, Simone Ciampi, Vinicius R Gonçales, J Justin Gooding
Light can be used to spatially resolve electrochemical measurements on a semiconductor electrode. This phenomenon has been explored to detect DNA hybridization with light-addressable potentiometric sensors and, more recently, with light-addressable amperometric sensors based on organic-monolayer-protected Si(100). Here, a contribution to the field is presented by comparing sensing performances when bovine serum albumin (BSA) and hexaethylene glycol (OEG6 ) are employed as antifouling layers that resist nonspecific adsorption to the DNA-modified interface on Si(100) devices...
September 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Claudia A Caro-Díaz, Luis Lillo-Arroyo, Francisco J Valenzuela-Melgarejo, Víctor Roudergue-Zúñiga, Gerardo Cabello-Guzmán
This study was conducted to assess the catalytic electrode surface adsorption and capture properties of different metal chitosan derivatives in aqueous phosphate buffer solution (pH = 7.3). Early, recent work showed that the response of Iron chitosan complex with R = -CH3 on the periphery, over blood red cells in presence of sphingomyelinase C was protected. The effect of others substituent (R = -Br, -Cl, -F, NO2 , -OCH3 , -H) on the periphery of the Schiff base ligand did not show correlation with the oxidation of sphingomyelinase C and its biological response...
August 1, 2018: Food and Chemical Toxicology
Zhi Geng, Zhiting Chen, Zhaoyang Li, Xin Qi, Xia Yang, Wei Fan, Yingna Guo, Leilei Zhang, Mingxin Huo
TiO2 nanotubes (TNTs) and AgCl/TiO2 nanotubes (AgCl/TNTs) were synthesized by a hydrothermal method and used in the reduction of nitrate with formic acid as a hole scavenger. As-synthesized photocatalysts were well characterized by field emission scanning electron microscopy (FESEM), high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), X-ray photoelectron spectra (XPS), N2 adsorption-desorption and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). 5 wt% AgCl/TNTs showed excellent performance in the reduction of nitrate (94...
August 14, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Artur Kasprzak, Magdalena Poplawska
The introduction of cyclodextrin species to graphene-family materials (GFMs) constitutes an important area of research, especially in terms of the development of applied nanoscience. The chemistry of cyclodextrins is the so-called host-guest chemistry, which has impacted on many fields of research, including catalysis, electrochemistry and nanomedicine. Cyclodextrins are water-soluble and biocompatible supramolecules, and therefore they may introduce new interesting properties to GFMs and may enhance the physicochemical/biological features of native GFMs...
August 11, 2018: Chemical Communications: Chem Comm
Gastón D Pierini, Christopher W Foster, Samuel J Rowley-Neale, Héctor Fernández, Craig E Banks
Screen-printed electrodes (SPEs) are ubiquitous with the field of electrochemistry allowing researchers to translate sensors from the laboratory to the field. In this paper, we report an electrochemically driven intercalation process where an electrochemical reaction uses an electrolyte as a conductive medium as well as the intercalation source, which is followed by exfoliation and heating/drying via microwave irradiation, and applied to the working electrode of screen-printed electrodes/sensors (termed EDI-SPEs) for the first time...
July 9, 2018: Analyst
Bo Shen, Xianghua Wen, Gregory V Korshin
Herein, the rotating disk electrode technique was used for the first time to investigate the effects of mass-transfer limitations and pH on the electrochemical oxidation of CPX, to determine the kinetics of CPX oxidation and to explore intrinsic mechanisms during the electron transfer process. Firstly, cyclic voltammetry revealed that an obvious irreversible CPX oxidation peak was observed within the potential window from 0.70 to 1.30 V at all pHs. Based on the Levich equation, the electrochemical oxidation of CPX in the electron transfer process was found to be controlled by both diffusion and kinetic processes when pH = 2, 5, 7 and 9; the diffusion coefficient of CPX at pH = 2 was calculated to be 1...
June 20, 2018: Environmental Science. Processes & Impacts
Craig Jowett, Irina Solntseva, Lingling Wu, Chris James, Susan Glasauer
Clear sand adsorbs 15-35% total phosphorus (P) from septic tank effluent, but P is mobilized when low-P effluent is applied. Amorphous P compounds formed by alkali aluminate chemical addition may also be subject to leaching. Crystalline mineralization is the desired end effect that isolates P thoroughly from the water resource. Using new low-energy iron electrochemistry (EC-P process), dissolved ferrous iron reacts with sewage phosphate ions (PO4 ) and precipitates onto filtration medium as vivianite [Fe3 (PO4 )2 ·8H2 O], as identified by scanning electron microscopy and X-ray diffraction and predicted from Eh-pH-aHPO4 2- phase relations...
May 2018: Water Science and Technology: a Journal of the International Association on Water Pollution Research
Lifu Chen, Eden E L Tanner, Chuhong Lin, Richard G Compton
Graphene nanoplatelets are shown to electrocatalyse the oxidation of dopamine. Single entity measurements ('nano-impacts') coupled with microdisc voltammetry and UV-visible spectroscopy reveal that adsorption of dopamine and its oxidised product on the graphene nanoplatelets is the key factor causing the observed catalysis. Genetic implications are drawn both for the study of catalysts in general and for graphene nanoplatelets in particular.
January 7, 2018: Chemical Science
David Avnir
A unique materials' methodology enables the doping of metals with functional molecules, polymers, enzymes, and nanoparticles. The resulting materials have either the combined properties of the metal and the dopants, or new, sometimes synergetic properties that are not found in the separate components, emerge. Metals that have been doped so far include gold, silver, copper, iron, gallium, palladium, platinum, and several alloys. Numerous applications have been demonstrated including catalysis, biocatalysis, bioactivity, electrochemistry (including new type of batteries), corrosion resistance, induction of chirality, tailoring unconventional properties to metals, and more...
March 12, 2018: Advanced Materials
Lisa M Housel, Lei Wang, Alyson Abraham, Jianping Huang, Genesis D Renderos, Calvin D Quilty, Alexander B Brady, Amy C Marschilok, Kenneth J Takeuchi, Esther S Takeuchi
Future advances in energy storage systems rely on identification of appropriate target materials and deliberate synthesis of the target materials with control of their physiochemical properties in order to disentangle the contributions of distinct properties to the functional electrochemistry. This goal demands systematic inquiry using model materials that provide the opportunity for significant synthetic versatility and control. Ideally, a material family that enables direct manipulation of characteristics including composition, defects, and crystallite size while remaining within the defined structural framework would be necessary...
March 20, 2018: Accounts of Chemical Research
Ana-Maria Chiorcea-Paquim, Teodor Adrian Enache, Ana Maria Oliveira-Brett
Alzheimer's disease (AD) is a widespread form of dementia that is estimated to affect 44.4 million people worldwide. AD pathology is closely related to the accumulation of amyloid beta (Aβ) peptides in fibrils and plagues, the small oligomeric intermediate species formed during the Aβ peptides aggregation presenting the highest neurotoxicity. This review discusses the recent advances on the Aβ peptides electrochemical characterization. The Aβ peptides oxidation at a glassy carbon electrode occurs in one or two steps, depending on the amino acid sequence, length and content...
2018: Current Medicinal Chemistry
Shuangshuang Zhang, Rongji Liu, Shiwen Li, Anne Dolbecq, Pierre Mialane, Lin Suo, Lihua Bi, Baofang Zhang, Tianbo Liu, Caixia Wu, Likai Yan, Zhongmin Su, Guangjin Zhang, Bineta Keita
The application of nanohybrids based on polyoxomolybdates, reduced graphene oxide (rGO) and/or metal nanoparticles (NPs) high-performance electrode materials in electrocatalysis and energy storage devices is promising but still limited due to the complexity and the cost of the synthesis. Here we introduce a simple polyoxomolybdate, [MoV 4 O8 (OH)2 (H2 O)2 (C4 O4 )2 ]2- (MoS), as reducing and stabilizing agent for the facile and one-pot syntheses of large quantity of highly stable MoS/rGO and MoS/Au NPs nanohybrids in aqueous solution without any catalyst or toxic co-solvent...
March 15, 2018: Journal of Colloid and Interface Science
Meilan Pan, Chao Shan, Xiaolin Zhang, Yanyang Zhang, Chanyuan Zhu, Guandao Gao, Bingcai Pan
Adsorption is a classical process widely used in industry and environmental protection, and the regeneration of exhausted adsorbents, as the reverse process of adsorption, is vital to achieving a sustainable adsorption process. Chemical and thermal regeneration, which feature high costs and environmental side effects, are classical but not environmentally friendly methods. Herein, a new regeneration method based on an electrochemical process using graphene aerogel (GA) as a model conductive adsorbent was proposed...
January 16, 2018: Environmental Science & Technology
Yawei Feng, Lili Ling, Jinhui Nie, Kai Han, Xiangyu Chen, Zhenfeng Bian, Hexing Li, Zhong Lin Wang
Recently, atmospheric pollution caused by particulate matter or volatile organic compounds (VOCs) has become a serious issue to threaten human health. Consequently, it is highly desirable to develop an efficient purifying technique with simple structure and low cost. In this study, by combining a triboelectric nanogenerator (TENG) and a photocatalysis technique, we demonstrated a concept of a self-powered filtering method for removing pollutants from indoor atmosphere. The photocatalyst P25 or Pt/P25 was embedded on the surface of polymer-coated stainless steel wires, and such steel wires were woven into a filtering network...
December 26, 2017: ACS Nano
Shu Min Tan, Martin Pumera
Among transition metal dichalcogenide (TMD)-based composites, TMD/graphene-related material and bichalcogen TMD composites have been widely studied for application toward energy production via the hydrogen evolution reaction (HER). However, scarcely any literature explored the possibility of bimetallic TMD hybrids as HER electrocatalysts. The use of harmful chemicals and harsh preparation conditions in conventional syntheses also detracts from the objective of sustainable energy production. Herein, we present the conservational alternative synthesis of MoWSx via one-step bipolar electrochemical deposition...
December 6, 2017: ACS Applied Materials & Interfaces
Dhanjai, Ankita Sinha, Lingxia Wu, Xianbo Lu, Jiping Chen, Rajeev Jain
Bisphenols (BPs) are well known endocrine disrupting chemicals (EDCs) that cause adverse effects on the environment, biotic life and human health. BPs have been studied extensively because of an increasing concern for the safety of the environment and for human health. They are major raw materials for manufacturing polycarbonates, thermal papers and epoxy resins and are considered hazardous environmental contaminants. A vast array of sensors and biosensors have been developed for the sensitive screening of BPs based on carbon nanomaterials (carbon nanotubes, fullerenes, graphene and graphene oxide), quantum dots, metal and metal oxide nanocomposites, polymer nanocomposites, metal organic frameworks, ionic liquids and molecularly imprinted polymers...
January 15, 2018: Analytica Chimica Acta
Chunhua Cui, Marc Heggen, Wolf-Dietrich Zabka, Wei Cui, Jürg Osterwalder, Benjamin Probst, Roger Alberto
Atomically dispersed supported catalysts can maximize atom efficiency and minimize cost. In spite of much progress in gas-phase catalysis, applying such catalysts in the field of renewable energy coupled with electrochemistry remains a challenge due to their limited durability in electrolyte. Here, we report a robust and atomically dispersed hybrid catalyst formed in situ on a hematite semiconductor support during photoelectrochemical oxygen evolution by electrostatic adsorption of soluble monomeric [Ir(OH)6 ]2- coupled to positively charged NiOx sites...
November 7, 2017: Nature Communications
Xueying Ko, Sumit Sharma
Modifying properties of metal-water interfaces via adsorption of surfactants has applications in electrochemistry and catalysis. We report molecular simulations of adsorption of surfactant molecules on metal surfaces wherein we systematically vary the strength of hydrophobic interaction between surfactant tails, as well as the size of the surfactants' polar head group. A surfactant molecule is represented by a linear, bead-spring model with a polar "head" bead and a chain of hydrophobic "tail" beads...
November 16, 2017: Journal of Physical Chemistry. B
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