Abstract An anionic and a cationic bipolar amphiphile containing rigid biphenyl cores were synthesized. The compounds dissolved in mixture of dimethylsulfoxide (DMSO) water pure water, respectively. When solid substrate with positively charged planar surface is immersed the solution negatively amphiphile, monolayer adsorbed due to its structure charge reversed. After rinsing amphiphile. Again but now original restored. By repeating both steps cyclic fashion alternating multilayer assemblies...

Abstract We have recently reported on the consecutive physisorption of anionic and cationic bipolar amphiphiles onto charged surfaces, adsorbed out aqueous solutions [1]. Here, we extend our previous concept to multipolar compounds such as polyelectrolytes. In contrast amphiphile system, it is not necessary separate single charges by a rigid unit, when polyelectrolyte from sufficiently concentrated solutions. this case physisorbed layer does bind with all ionic groups surface exposes free at...

A very short processing time for making well-organized multilayer films can be achieved employing the novel spin self-assembly method described in this paper. The authors elaborate on advantages of versus conventional methods fabrication polyelectrolyte films. Figure illustrates that spinning process (bottom) yields far better organized layers than instance direct dipping (top).

An improved hydrothermal process is developed to fabricate macroporous graphene monoliths (MGMs) using a soft template of organic droplets. The MGMs are constructed from closed-cell distorted spherical pores. This unique microstructure makes that have low weight densities, good electrical conductivities, and excellent elasticity with rapid recovery rates. As service our authors readers, this journal provides supporting information supplied by the authors. Such materials peer reviewed may be...

Multilayer assemblies of uniform ultrathin film electrodes with good electrical conductivity and very large surface areas were prepared for use as electrochemical capacitors. A layer-by-layer self-assembly approach was employed in an effort to improve the processability highly conducting polyaniline (PANi) chemically modified graphene. The properties multilayer (MF-) electrodes, including sheet resistance, volumetric capacitance, charge/discharge ratio, determined by morphological...

A graphene–sulfur (G–S) composite was conformally coated with an ultrathin Al2O3 film via atomic layer deposition (ALD) and used as the cathode of a lithium–sulfur (Li–S) battery. The G–S ALD-Al2O3 coating delivered high specific capacity 646 mA h g−1 after 100 charge–discharge cycles at 0.5 C, this value is about twice that bare composite. rate capability coulombic efficiency electrode were also greatly increased. worked artificial barrier to suppress dissolution polysulfides alleviate...

A hair-derived carbon/sulfur composite was wrapped with reduced graphene oxide sheets and used as the cathode for lithium–sulfur batteries, exhibiting superior cycling stability, good rate capability high coulombic efficiency.

A reduced graphene oxide (rGO)-sulfur composite aerogel with a compact self-assembled rGO skin was further modified by an atomic layer deposition (ALD) of ZnO or MgO layer, and used as free-standing electrode material lithium-sulfur (Li-S) battery. The ALD-oxide coating worked natural artificial barriers to constrain the polysulfides within cathode region. As result, Li-S battery based on this exhibited superior cycling stability, good rate capability high coulombic efficiency. Furthermore,...

A rGO/TiO₂ free standing film has been fabricated <italic>via</italic> a simple and facile vacuum filtration system. The composite electrode showed improved electrochemical properties compared to the pure rGO due highly expanded layer-structure.

This article describes the formation of dopamine-melanin thin films (50–200 nm thick) at an air/dopamine solution interface under static conditions. Beneath these films, spherical melanin granules formed in bulk liquid phase. The thickness relied mainly on concentration dopamine and reaction time. A plausible mechanism underlining film was proposed based hydrophobicity aggregates mass transport to air/solution as a result convective flow. interfacial increased linearly with (formed phase)...

Little is known regarding the effect of graphene lateral size on electrochemical performance hybrid electrode. This work examines a flexible supercapacitor electrode composed ultralarge oxide (UGO; mean 47 ± 22 μm) and vanadium dioxide (VO 2 ) nanobelts, referring to reference small scale (SGO; 0.8 0.5 VO .Thermal treatment converts UGO/VO SGO/VO URGO/VO (denoted VURGO) SRGO/VO VSRGO) electrodes, respectively. The sheet resistance VURGO film (0.57 0.03 kΩ sq. –1 was two orders magnitude...

The commercialized aluminum electrolytic capacitors (AECs) currently used for alternating current (AC) line-filtering are usually the largest components in electronic circuits because of their low specific capacitances and bulky sizes. Herein, nitrogen-doped holey graphene (NHG) films were prepared by thermal annealing composite polyvinylpyrrolidone (PVP), oxide (GO), ferric (Fe2O3) nanorods followed chemical etching with hydrochloride acid. typical electrochemical capacitor NHG electrodes...

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication the EditorNEXTLayer-by-Layer Deposited Multilayer Assemblies of Ionene-Type Polyelectrolytes Based on Spin-Coating MethodSeung-Sub Lee, Jong-Dal Hong, Chang Hwan Kim, Kwan Ja Pil Koo, and Ki-Bong LeeView Author Information Department Chemistry, University Inchon, 177 Dohwa-dong Nam-gu, Inchon 402-749, Korea Division Chemistry Molecular Engineering Center for Catalysis, Seoul National University, 151-742, Physic, Pohang...

With the assistance of graphene oxide sheets, egg proteins were hydrothermally carbonized and further activated using KOH to form a heteroatom-doped highly porous carbon material for high-performance supercapacitors.

This article describes a new class of triple thermoresponsive 'schizophrenic' diblock copolymer that undergoes transitions from conventional micelles (or vesicles) via unimers to reverse and finally precipitated state upon heating. The various transition temperatures this could be well controlled by the concentration trivalent anion pH control upper critical solution temperature poly(dimethylaminoethyl methacrtylate) (PDMAEMA) block or type poly(methoxy oligoethylenegylol methacrylate)...

This article describes the effect of lateral size graphene oxide (GO) on humidity sensing properties a GO-based sensor.

A facile method is reported to prepare highly conductive stretchable wavy reduced graphene oxide (rGO) films by in situ reducing blade‐coated on elastic tapes. The sheet resistance of a 1.20 μm thick rGO film coated tape measured be as low 21 Ω sq −1 and it does not change during 1000 cycles stretching/releasing with maximum strain 100%. can also detached from its substrate into freestanding state, keeping excellent elasticity. This reduction involve transfer high‐temperature annealing; thus...

The fabrication of a polyelectrolyte multilayer (PEM) on porous membrane was successfully improved by using spin-coating electrostatic self-assembly. Surprisingly, the quality PEM film obtained nanoporous alumina substrate (i.e., its thickness and surface morphology) comparable to that deposited silicon. An optical molecular switch acts as an ion-gating channel realized layer-by-layer support. One layer components this device poly(acrylamide) copolymer containing azobenzene chromophore,...