Analysis of rates tunneling across self-assembled monolayers (SAMs) n-alkanethiolates SCn (with n = number carbon atoms) incorporated in junctions having structure Ag(TS)-SAM//Ga2O3/EGaIn leads to a value for the injection tunnel current density J0 (i.e., flowing through an ideal junction with 0) 10(3.6±0.3) A·cm(-2) (V +0.5 V). This estimation does not involve extrapolation length, because it was possible measure densities SAMs over range lengths 1-18. is estimated under assumption that...

Tunneling junctions having the structure AgTS–S(CH2)n−1CH3//Ga2O3/EGaIn allow physical–organic studies of charge transport across self-assembled monolayers (SAMs). In ambient conditions, surface liquid metal electrode (EGaIn, 75.5 wt % Ga, 24.5 In, mp 15.7 °C) oxidizes and adsorbs―like other high-energy surfaces―adventitious contaminants. The interface between EGaIn SAM thus includes a film oxide, probably also organic material adsorbed on this film; will influence properties operation...

This paper compares charge transport across self-assembled monolayers (SAMs) of n-alkanethiols containing odd and even numbers methylenes. Ultraflat template-stripped silver (Ag(TS)) surfaces support the SAMs, while top electrodes eutectic gallium-indium (EGaIn) contact SAMs to form metal/SAM//oxide/EGaIn junctions. The EGaIn spontaneously reacts with ambient oxygen a thin (∼1 nm) oxide layer. layer enables maintain stable, conical shape (convenient for forming microcontacts SAMs) retaining...

The fabrication and properties of “fluoroalkylated paper” (“R F paper”) by vapor‐phase silanization paper with fluoroalkyl trichlorosilanes is reported. R both hydrophobic oleophobic: it repels water ( θ app H 2 O >140°), organic liquids surface tensions as low 28 mN m ‐1 , aqueous solutions containing ionic non‐ionic surfactants, complex such blood (which contains salts, biological material cells, proteins, lipids). propensity the to resist wetting a wide range correlates length degree...

This article describes the use of embossing and "cut-and-stack" methods assembly, to generate microfluidic devices from omniphobic paper demonstrates that fluid flowing through these behaves similarly in an open-channel device. The porosity gases allows processes not possible made using PDMS or other nonporous materials. Droplet generators phase separators, for example, could be by "T"-shaped channels on paper. Vertical stacking embossed cut layers generated three-dimensional systems...

We report a simple method that uses (i) emulsion shearing with oxidation to make core-shell particles, and (ii) surface-tension driven phase segregation synthesize particles complex surface compositions morphologies. Subjecting eutectic gallium-indium, liquid metal, shear in an acidic carrier fluid we synthesized smooth 6.4 nm over 10 μm diameter. Aggregates of these can be reconfigured into larger structures using focused ion beam. Using Field's metal melts homogeneous nanoparticles solid...

Paper-based microfluidic devices have emerged as simple yet powerful platforms for performing low-cost analytical tests. This paper reports a paper-based electrochemical biosensor array multiplexed detection of physiologically relevant metabolic biomarkers. Different from existing devices, our device includes an eight sensors and utilizes handheld custom-made reader (potentiostat) signal readout. The can detect several analytes in sample solution produce multiple measurements each analyte...

The liquid–metal eutectic of gallium and indium (EGaIn) is a useful electrode for making soft electrical contacts to self-assembled monolayers (SAMs). This has, however, one feature whose effect on charge transport has been incompletely understood: thin (approximately 0.7 nm) film—consisting primarily Ga2O3—that covers its surface when in contact with air. SAMs that rectify current have measured using this AgTS-SAM//Ga2O3/EGaIn (where AgTS = template-stripped Ag surface) junctions. paper...

Insensitivity: A series of molecules containing a common head group and body as well structurally varied tail groups (-R) has been used in junctions with the structure Ag/S(CH2)4CONH(CH2)2R//Ga2O3/EGaIn to study rates charge transport by tunneling. Changing R over range aliphatic, aromatic, heteroaromatic organic was found not significantly influence rate tunneling (see plots; dashed lines represent calibration standards).

This paper applies statistical methods to analyze the large, noisy data sets produced in measurements of tunneling current density (J) through self-assembled monolayers (SAMs) large-area junctions. It describes and compares accuracy precision procedures for summarizing individual SAMs, comparing two or more determining parameters Simmons model (β J0). For that contain significant numbers outliers (i.e., most charge transport), commonly used techniques—e.g., with arithmetic mean standard...

This paper compares rates of charge transport across self-assembled monolayers (SAMs) n-alkanethiolates having odd and even numbers carbon atoms (nodd neven) using junctions with the structure M(TS)/SAM//Ga2O3/EGaIn (M = Au or Ag). Measurements current density, J(V), SAMs on Au(TS) Ag(TS) demonstrated a statistically significant odd-even effect Au(TS), but not Ag(TS), that could be detected this technique. Statistical analysis showed values tunneling density nodd neven belonging to two...

Abstract Phase-change materials, such as meta-stable undercooled (supercooled) liquids, have been widely recognized a suitable route for complex fabrication and engineering. Despite comprehensive studies on the undercooling phenomenon, little progress has made in use of metals, primarily due to low yields poor stability. This paper reports an extension droplet emulsion technique (SLICE) produce core-shell particles structure; metal/oxide shell-acetate (‘/’ = physisorbed, ‘-’ chemisorbed),...

Complex multi-element alloys are gaining prominence for structural applications, supplementing steels, and superalloys. Understanding the impact of each element on alloy surfaces due to oxidation is vital in maintaining material integrity. This study investigates mechanisms these using a model five-element equiatomic CoCrFeNiMn alloy, controlled oxygen environment. The oxidation-induced surface changes correlate with element's interactive tendencies environment, guided by thermodynamics....

Paramagnetic ionic liquids (PILs) provide new capabilities to measurements of density using magnetic levitation (MagLev). In a typical measurement, diamagnetic object unknown is placed in container containing PIL. The between two magnets (typically NdFeB, oriented with like poles facing). the can be determined by measuring its position field along vertical axis (levitation height, h), either as an absolute value or relative internal standards known density. For MagLev, PILs have three...

Droplets capture an environment-dictated equilibrium state of a liquid material. Equilibrium, however, often necessitates nanoscale interface organization, especially with formation passivating layer. Herein, we demonstrate that this kinetics-driven organization may predispose material to autonomous thermal-oxidative composition inversion (TOCI) and texture reconfiguration under felicitous choice trigger. We exploit inherent structural complexity, differential reactivity, metastability the...

The solid-state NMR spectra of many active elements are often extremely broad due to the presence chemical shift anisotropy (CSA) and/or quadrupolar interaction (for nuclei with spin I > 1/2). These interactions give rise wideline which can span hundreds kHz or several MHz. Here we demonstrate that by using fast MAS, proton detection and dipolar hetero-nuclear multiple-quantum (D-HMQC) pulse sequences, it is possible rapidly acquire 2D correlate 1H shifts indirectly detected MAS powder...

Mechanically triggered relaxation of metastable liquid metal is used to autonomously alter the stiffness a polymer composite. This approach smart responsive materials exploits distribution in thermodynamic potential tune response rate.

Chamäleon-Metalle. Die metallpassivierende Oxidschicht ist ein komplexes Pseudogleichgewichtssystem mit einer Vielzahl unentdeckter Merkmale. In ihrem Forschungsartikel auf S. 360 nutzen M. Thuo et al. die Komplexität dieser dünnen für gezielte Modifizierung von Oberflächendesign und -struktur, was in der Bildung kompositorisch invertierten Oberflächenmerkmalen nanoskaligen fraktalartigen Designs resultiert. Elektrokatalyse Proteinstrukturen Asymmetrische Katalyse Hochauflösende Bildgebung

Self-assembled monolayers (SAMs) are widely used in surface modifications, specifically tuning the chemistry of materials. The structure and properties SAMs have been extensively studied often with sophisticated tools, even for simplest n-alkanethiolate SAMs. In SAMs, especially linear n-alkanethiolates, dependent on chain length, which is best manifested so-called odd-even effect, a simple yet not fully understood phenomenon. One main challenge delineating origin length-dependent...

Studies on passivating oxides liquid metals are challenging, in part, due to plasticity, entropic, and technological limitations. In alloys, compositional complexity the oxide(s) underlying metal interface exacerbates these challenges. This nanoscale complexity, however, offers an opportunity engineer surface of under felicitous choice processing conditions. We inferred that difference reactivity, coupled with inherent ordering, presages exploitable order selectivity autonomously present...

Interfacial chemistry at organic–inorganic contact critically determines the function of a wide range molecular and organic electronic devices other systems. The is, however, difficult to understand due lack easily accessible in-operando spectroscopic techniques that permit access interfacial structure on scale. Herein, we compare two analogous junctions formed with identical thin film different liquid top-contacts (water droplet vs eutectic gallium indium alloy) elucidate puzzling...

The ability of metal alloys to rapidly oxidize in ambient conditions presents both a challenge and an opportunity. Herein, we focus on opportunities buried the passivating oxide liquid particles. Recently described subsurface complexity order present opportunity frustrate homogeneous nucleation and, hence, enhanced undercooling. plasticity underlying surface offers autonomously repairing lowest E0 component dominates unless stoichiometrically limited. This provides synthesize organometallic...

ADVERTISEMENT RETURN TO ARTICLES ASAPPREVViewpointBeyond Hume-Rothery RulesAndrew MartinAndrew MartinDepartment of Materials Science and Engineering, North Carolina State University, Raleigh, 27695, United StatesMore by Andrew MartinView Biography Martin Thuo*Martin ThuoDepartment States*Email: [email protected]More ThuoView Biographyhttps://orcid.org/0000-0003-3448-8027Cite this: Acc. Mater. Res. 2023, XXXX, XXX, XXX-XXXPublication Date (Web):August 18, 2023Publication History Received12...