journal
MENU ▼
Read by QxMD icon Read
search

Faraday Discussions

journal
https://www.readbyqxmd.com/read/28443848/semiempirical-modeling-of-electrochemical-charge-transfer
#1
Rebecca L Gieseking, Mark A Ratner, George C Schatz
Nanoelectrochemical experiments using detection based on tip enhanced Raman spectroscopy (TERS) show a broad distribution of single-molecule formal potentials E°' for large π-conjugated molecules; theoretical studies are needed to understand the origins of this distribution. In this paper, we present a theoretical approach to determine E°' for electrochemical reactions involving a single molecule interacting with an electrode represented as a metal nanocluster and apply this method to the Ag20-pyridine system...
April 26, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28443836/energy-harvesting-from-aperiodic-low-frequency-motion-using-reverse-electrowetting
#2
Tsung-Hsing Hsu, J A Taylor, T N Krupenkin
Mechanical energy harvesting can provide a promising alternative to electrochemical batteries, which are currently widely utilized to power mobile electronics. In this work we present a theoretical analysis of a recently proposed method of mechanical energy harvesting, which combines a reverse electrowetting phenomenon with the fast self-oscillating process of bubble growth and collapse. We investigate the details of the bubble dynamics and analyze the dependence of the energy generation process on the system parameters...
April 26, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28440384/theoretical-and-numerical-analysis-of-nano-actuators-based-on-grafted-polyelectrolytes-in-an-electric-field
#3
N V Brilliantov, Yu A Budkov, C Seidel
We analyze, theoretically and by means of molecular dynamics (MD) simulations, the generation of mechanical force by a polyelectrolyte (PE) chain grafted to a plane and exposed to an external electric field; the free end of the chain is linked to a deformable target body. Varying the field, one can alter the length of the non-adsorbed (bulk) part of the chain and hence the deformation of the target body and the arising force. We focus on the impact of added salt on the magnitude of the generated force, which is especially important for applications...
April 25, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28440374/electrotunable-lubricity-with-ionic-liquids-the-influence-of-nanoscale-roughness
#4
Alessio David, Oscar Y Fajardo, Alexei A Kornyshev, Michael Urbakh, Fernando Bresme
The properties of ionic liquids can be modified by applying an external electrostatic potential, providing a route to control their performance in nanolubrication applications. Most computational studies to date have focused on the investigation of smooth surfaces. Real surfaces are generally inhomogeneous and feature roughness of different length scales. We report here a study of the possible effects that surface roughness may have on electrotunable lubricity with ionic liquids, performed here by means of non-equilibrium molecular dynamics simulations...
April 25, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28436529/modifying-surface-forces-through-control-of-surface-potentials
#5
Ran Tivony, Jacob Klein
Combining direct surface force measurements with in situ regulation of surface potential provides an exceptional opportunity for investigating and manipulating interfacial phenomena. Recently, we studied the interaction between gold and mica surfaces in water with no added salt, while controlling the metal potential, and found that the surface charge at the metal may vary, and possibly even change its sign, as it progressively approaches the (constant-charge) mica surface [Langmuir, 2015, 31(47), 12845-12849]...
April 24, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28436527/electrowetting-on-conductors-anatomy-of-the-phenomenon
#6
Kontad Ounnunkad, Hollie V Patten, Matěj Velický, Anna K Farquhar, Paula A Brooksby, Alison J Downard, Robert A W Dryfe
We have recently reported that reversible electrowetting can be observed on the basal plane of graphite, without the presence of a dielectric layer, in both liquid/air and liquid/liquid configurations. The influence of carbon structure on the wetting phenomenon is investigated in more detail here. Specifically, it is shown that the adsorption of adventitious impurities on the graphite surface markedly suppresses the electrowetting response. Similarly, the use of pyrolysed carbon films, although exhibiting a roughness below the threshold previously identified as the barrier to wetting on basal plane graphite, does not give a noticeable electrowetting response, which leads us to conclude that specific interactions at the water-graphite interface as well as graphite crystallinity are responsible for the reversible response seen in the latter case...
April 24, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28436506/electrostatic-interactions-between-ions-near-thomas-fermi-substrates-and-the-surface-energy-of-ionic-crystals-at-imperfect-metals
#7
V Kaiser, J Comtet, A Niguès, A Siria, B Coasne, L Bocquet
The electrostatic interaction between two charged particles is strongly modified in the vicinity of a metal. This situation is usually accounted for by the celebrated image charges approach, which was further extended to account for the electronic screening properties of the metal at the level of the Thomas-Fermi description. In this paper we build upon a previous approach [M. A. Vorotyntsev and A. A. Kornyshev, Zh. Eksp. Teor. Fiz., 1980, 78(3), 1008-1019] and successive works to calculate the 1-body and 2-body electrostatic energy of ions near a metal in terms of the Thomas-Fermi screening length...
April 24, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28429020/catalysis-for-fuels-general-discussion
#8
Hans Niemantsverdriet, Pieter van Helden, Emiel Hensen, David Lennon, Katherine Holt, Graham Hutchings, Michael Bowker, Richard Catlow, Mzamo Shozi, Linda Jewell, Michael Claeys, James Hayward, Neil Coville, Nico Fischer, Alberto Roldan, Evjeniy Redekop, Thobani Gambu, Letisha Deeplal, Thabiso Perfect Oscar Mkhwanazi, Kees-Jan Weststrate, Detlef Bahnemann, Matthew Neurock, Hans Schulz, Ding Ma, Simon Kondrat, Paul Collier, Abhishek Kumar Gupta, Avelino Corma, Paul Akomeah, Enrique Iglesia, Eric van Steen, Nora de Leeuw, Moritz Wolf, Tracey van Heerden
No abstract text is available yet for this article.
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28429016/synergetic-effects-of-k-and-mg-2-ion-intercalation-on-the-electrochemical-and-actuation-properties-of-the-two-dimensional-ti3c2-mxene
#9
Qiang Gao, Jeremy Come, Michael Naguib, Stephen Jesse, Yury Gogotsi, Nina Balke
Two-dimensional materials, such as MXenes, are attractive candidates for energy storage and electrochemical actuators due to their high volume changes upon ion intercalation. Of special interest for boosting energy storage is the intercalation of multivalent ions such as Mg(2+), which suffers from sluggish intercalation and transport kinetics due to its ion size. By combining traditional electrochemical characterization techniques with electrochemical dilatometry and contact resonance atomic force microscopy, the synergetic effects of the pre-intercalation of K(+) ions are demonstrated to improve the charge storage of multivalent ions, as well as tune the mechanical and actuation properties of the Ti3C2 MXene...
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28429015/asymmetric-electroosmotic-pumping-across-porous-media-sandwiched-with-perforated-ion-exchange-membranes
#10
A Yaroshchuk, E E Licón, E K Zholkovskiy, M P Bondarenko, T Heldal
To have non-zero net flow in AC electroosmotic pumps, the electroosmosis (EO) has to be non-linear and asymmetric. This can be achieved due to ionic concentration polarization. This is known to occur close to micro-/nano-interfaces provided that the sizes of the nanopores are not too large compared to the Debye screening length. However, operation of the corresponding EO pumps can be quite sensitive to the solution concentration and, thus, unstable in practical applications. Concentration polarization of ion-exchange membranes is much more robust...
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28429003/electrochemical-plasmonic-metamaterials-towards-fast-electro-tuneable-reflecting-nanoshutters
#11
Debabrata Sikdar, Alwin Bucher, Cristian Zagar, Alexei A Kornyshev
Self-assembling arrays of metallic nanoparticles at liquid|liquid or liquid|solid interfaces could deliver new platforms for tuneable optical systems. Such systems can switch between very-high and very-low reflectance states upon assembly and disassembly of nanoparticles at the interface, respectively. This encourages creation of electro-variably reversible mirror/window nanoplasmonic devices. However, the response time of these systems is usually limited by the rate-of-diffusion of the nanoparticles in the liquid, towards the interface and back...
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28428992/dynamic-shear-force-microscopy-of-confined-liquids-at-a-gold-electrode
#12
Günther Krämer, Florian Hausen, Roland Bennewitz
The confinement of liquids in nanometer-scale gaps can lead to changes in their viscous shear properties. For liquids of polar molecules, the charge state of the confining surfaces has a significant influence on the structure in the confined liquid. Here we report on the implementation of dynamic shear force microscopy in an electrochemical cell. Lateral oscillations of the tip of an atomic force microscope were magnetically activated at a frequency of about 50 kHz. The damping of the lateral tip oscillation was recorded as a function of the tip-sample distance and of the electrode potential at the surface of a Au(100) single crystal electrode...
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28428990/nanoscale-adhesion-and-sliding-on-biased-semiconductors
#13
A Mukherjee, A D Craciun, J L Gallani, M V Rastei
We present experimental and theoretical results on controlling nanoscale sliding friction and adhesion by electric fields on model contacts realized by bringing a conductive atomic force microscope tip into contact with the surface of a silicon-oxide/silicon wafer. We find that applying a bias voltage on silicon (or on the conductive tip) enables a noticeable control of the sliding forces. Two electrostatic interactions are identified as being relevant for the friction variation as a function of applied voltage...
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28428985/strain-capacitance-relationship-in-polymer-actuators-based-on-single-walled-carbon-nanotubes-and-ionic-liquid-gels
#14
Hyacinthe Randriamahazaka, Kinji Asaka
We investigate the electromechanical properties of bucky-gel electrochemical actuators incorporating various amounts of single-walled carbon nanotubes and an ionic liquid electrolyte, 1-butyl-3-methylimidazolium tetrafluoroborate, that are able to convert electrochemical energy into mechanical energy. The interplay between mechanical and electrochemical effects is studied. The electromechanical responses are investigated by means of electrochemical impedance spectroscopy and bending displacement measurements...
April 21, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28426041/hydrocarbon-conversion-in-the-production-of-synthetic-fuels-general-discussion
#15
Linda Jewell, Graham Hutchings, Michael Bowker, Emiel Hensen, Michael Claeys, James Hayward, Nico Fischer, Stephen McCord, Eric van Steen, Chelsea Tucker, Matthew Neurock, Hans Schulz, Unni Olsbye, Ding Ma, Paul Collier, Ying Zheng, Avelino Corma, Freek Kapteijn, Irina Yarulina, Siphamandla Hadebe, Enrique Iglesia, David Lennon, Burtron Davis
No abstract text is available yet for this article.
April 20, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28422221/designing-new-catalysts-for-synthetic-fuels-general-discussion
#16
Katherine Holt, Linda Jewell, Hans Niemantsverdriet, Lebohang Macheli, Mzamo Shozi, Graham Hutchings, Tim Wezendonk, Michael Bowker, Richard Catlow, Sarah Adam, Patricia J Kooyman, Emiel Hensen, James Hayward, Neil Coville, Kees-Jan Weststrate, Nico Fischer, Alberto Roldan, Evjeniy Redekop, Eric van Steen, Holger Friedrich, Dong-Hau Kuo, Harinarayana Bandaru, Letisha Deeplal, Aleksandar Zivkovic, Kershen Naiker, Chelsea Tucker, Thabiso Perfect Oscar Mkhwanazi, Detlef Bahnemann, Matthew Neurock, Anna Petersen, Roy Peter Forbes, Tumelo Phaahlamohlaka, Hans Schulz, David Lennon, Unni Olsbye, Moritz Wolf, Simon Kondrat, Paul Collier, Xiaohui Sun, Ying Zheng, Avelino Corma, Enrique Iglesia, Thulani Nyathi, Ding Ma, Marien Bremmer, Michael Claeys, Freek Kapteijn
No abstract text is available yet for this article.
April 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28422196/boundary-layer-friction-of-solvate-ionic-liquids-as-a-function-of-potential
#17
Hua Li, Mark W Rutland, Masayoshi Watanabe, Rob Atkin
Atomic force microscopy (AFM) has been used to investigate the potential dependent boundary layer friction at solvate ionic liquid (SIL)-highly ordered pyrolytic graphite (HOPG) and SIL-Au(111) interfaces. Friction trace and retrace loops of lithium tetraglyme bis(trifluoromethylsulfonyl)amide (Li(G4) TFSI) at HOPG present clearer stick-slip events at negative potentials than at positive potentials, indicating that a Li(+) cation layer adsorbed to the HOPG lattice at negative potentials which enhances stick-slip events...
April 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28422194/field-induced-anomalous-spreading-oscillation-ejection-spinning-and-breaking-of-oil-droplets-on-a-strongly-slipping-water-surface
#18
Sunny Kumar, Bhaskarjyoti Sarma, Ahsok Kumar Dasmahapatra, Amaresh Dalal, Dipankar Narayan Basu, Dipankar Bandyopadhyay
Application of an electric field on an oil droplet floating on the surface of a deionized water bath showed interesting motions such as spreading, oscillation, and ejection. The electric field was generated by connecting a pointed platinum cathode at the top of the oil droplet and a copper anode coated with polymer at the bottom of the water layer. The experimental setup mimicked a conventional electrowetting setup with the exception that the oil was spread on a soft and deformable water isolator. While at relatively lower field intensities we observed spreading of the droplet, at intermediate field intensities the droplet oscillated around the platinum cathode, before ejecting out at a speed as high as ∼5 body lengths per second at even stronger field intensities...
April 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28421222/novel-photocatalysts-general-discussion
#19
Graham Hutchings, Michael Bowker, Richard Catlow, Thulani Nyathi, Ilyaas Abdullah, Michael Claeys, Neil Coville, Alberto Roldan, Pieter van Helden, Nico Fischer, Eric van Steen, Linda Jewell, Lerato Mokoloko, Detlef Bahnemann, Matthew Neurock, Freek Kapteijn, Enrique Iglesia, Philip Gibson, Katherine Holt, Kazunari Domen, Abhishek Kumar Gupta
No abstract text is available yet for this article.
April 19, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28374024/bio-inspired-co2-reduction-by-a-rhenium-tricarbonyl-bipyridine-based-catalyst-appended-to-amino-acids-and-peptidic-platforms-incorporating-proton-relays-and-hydrogen-bonding-functional-groups
#20
S A Chabolla, C W Machan, J Yin, E A Dellamary, S Sahu, N C Gianneschi, M K Gilson, F A Tezcan, C P Kubiak
Herein, we report a new approach to bio-inspired catalyst design. The molecular catalyst employed in these studies is based on the robust and selective Re(bpy)(CO)3Cl-type (bpy = 2,2'-bipyridine) homogeneous catalysts, which have been extensively studied for their ability to reduce CO2 electrochemically or photochemically in the presence of a photosensitizer. These catalysts can be highly active photocatalysts in their own right. In this work, the bipyridine ligand was modified with amino acids and synthetic peptides...
April 4, 2017: Faraday Discussions
journal
journal
31122
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"