The dynamics of vesicle formation and growth following the mixing cationic cetyltrimethylammonium bromide (CTAB) anionic sodium octyl sulfate (SOS) surfactant solutions were determined using static dynamic light scattering. results are well-described by a two-stage model in which initial nonequilibrium vesicles generated rapidly subsequent is slower fusion. based on balance between unfavorable edge energy disklike aggregates bending required to form spherical structures. sizes correlated...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExtraction of amino acids to microemulsionMotonari Adachi, Makoto Harada, Akihisa Shioi, and Yasuo SatoCite this: J. Phys. Chem. 1991, 95, 20, 7925–7931Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1 October 1991https://pubs.acs.org/doi/10.1021/j100173a068https://doi.org/10.1021/j100173a068research-articleACS PublicationsRequest reuse permissionsArticle Views314Altmetric-Citations84LEARN...

Nano/micromotors exhibiting regulated motions are ubiquitous in nature, with biological ones having highly sophisticated and functional properties. However, nano/micromotors have not been applied the design of useful man-made chemical systems to our knowledge. In this article, we review artificial that proposed last decade. The underlying physics is completely different from conventional macroscale motors. viscous force dominates motion a nano/micromotor, which thermal fluctuation converts...

The design of dynamically self-assembled systems is high interest in science and technology. Here, we report a unique cascade the self-ordering droplets accompanied by dewetting transition. dynamic self-emergent are observed when thin liquid layer an immiscible fluorocarbon oil (perfluorooctyl bromide, PFOB) placed on water surface. Due to gradual evaporation PFOB, circular PFOB-free domain appears as result local A pearling structure generated at rim with growth hole. As next stage, linear...

Most of the current studies on nano/microscale motors to generate regular motion have adapted strategy fabricate a composite with different materials. In this paper, we report that simple object solely made platinum generates driven by catalytic chemical reaction hydrogen peroxide. Depending morphological symmetry particles, rich variety random and motions are observed. The experimental trend is well reproduced theoretical model taking into account anisotropic viscous effect self-propelled...

Most catalytic micro/nanomotors that have been developed so far use hydrogen peroxide as fuel, while some hydrazine. These fuels are difficult to apply because they can cause skin irritation, and often form store disruptive bubbles. In this paper, we demonstrate a novel Pt micromotor does not produce bubbles, is driven by the oxidation of stable, non-toxic primary alcohols aldehydes with dissolved oxygen. This organic mirrors living systems, lends new motor essentially same characteristics,...

Significant challenges have gone into the design of smart hydrogels, with numerous potential applications in industrial, cosmetic, and biomedical fields. Herein, we report synthesis novel 4-arm self-assembling peptide–polyethylene glycol (PEG) hybrid star-shaped polymers their comprehensive hydrogel properties. β-sheet-forming oligopeptides alternating hydrophobic Leu/ionizable Glu repeats Cys residues were successfully conjugated to PEG via a thiol–maleimide click reaction. The demonstrated...

Oscillation of dynamic interfacial tension and spontaneous flow due to the Marangoni instability were investigated for water/oil interface containing di(2-ethylhexyl) phosphoric acid (DEHPA) calcium chloride. Characteristics extracted from experimental results with tracer particles. The appeared randomly at interface. Movement a small particle put on was essentially random walk. By application theory walk, kinetic energy evaluated. evaluated decayed exponentially time after contact aqueous...

Nonlinear oscillation of interfacial tension was found for a liquid/liquid interface composed di(2-ethylhexyl) phosphoric acid/n-heptane/calcium chloride/water. The range the oscillations over several millineutons per meter, with longest one continuing few hours. A wide variety patterns observed, but they were classified into two groups. One group showed that power spectrum proportional to f-2, f being frequency, and distribution function amplitudes followed Gaussian function. This type...

In this study, a one-step method is discussed for producing uniform cell-sized microgels using glass capillaries filled with binary polymer blend of polyethylene glycol (PEG) and gelatin. Upon decreasing temperature, phase separation the PEG/gelatin blends gelation gelatin occur, then forms linearly aligned, uniformly sized in capillary. When DNA added to solution, entrapping are spontaneously formed, prevents coalescence microdroplets even at temperatures above melting point. This novel...

The autonomous motion of vesicle is observed in a simple chemical system. A composed didodecyldimethylammonium bromide DDAB breaks down by ion exchange from Br(-) to I(-). When an electrolyte supplied vesicles, some them begin move after induction period. They continue move, leaving behind the reaction products on trail. decreases size, and smaller vesicles remain motion. We examine characteristics this surface tension DDAB-containing aqueous phase depends KI concentration. Considering...

The direct current (DC) motor is a rotary device that converts DC electrical energy into mechanical energy. However, it known that, in downsizing the currently available macromotor, motion of micromotors cannot work well due to larger viscous effect. Here, we report simple working under new principle. We previously revealed an oil phase containing ionic surfactant, non-spherical particles exhibit various types regular motions such as spinning and circular orbital motions. In this study,...

Protein solubilization was studied for two kinds of reversed micellar systems with the aid phase transfer methods. The first system composed nonionic surfactant, poly(oxyethylene) alkyl ether (CiEj), and sodium bis(2-ethylhexyl)sulfosuccinate (AOT). Proteins used were α-chymotrypsinogen A (ctn) cytochrome-c (cytc). In absence AOT, protein solubilized in micelles by entropic effect. Then, fraction E proteins extracted to very low. increased addition AOT due electrostatic interaction between...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase equilibrium of sodium bis(2-ethylhexyl)phosphate/water/n-heptane/sodium chloride microemulsionAkihisa Shioi, Makoto Harada, and Keishi MatsumotoCite this: J. Phys. Chem. 1991, 95, 19, 7495–7502Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published inissue 1 September 1991https://pubs.acs.org/doi/10.1021/j100172a069https://doi.org/10.1021/j100172a069research-articleACS PublicationsRequest reuse...

An oil/water interface containing bis(2-ethylhexyl)phosphate and Ca(2+) or Fe(3+) exhibits spontaneous Marangoni instability associated with the fluctuation in interfacial tension. This rarely appears for systems Mg(2+), Sr(2+), Ba(2+), Cu(2+), Co(2+). The same ion selectivity is observed n-heptane nitrobenzene despite their significant differences density, viscosity, dielectric constant of oil. We studied this under acidic pH conditions to avoid neutralization reaction effects. result...

Abstract A vesicle that exhibited the extrusion and contraction of a pseudopod-like structure under pH gradient was studied. The is composed oleate oleic acid, transforms from double-spherical shape to disk-like after numerous cyclic changes, including reversal rotation vesicle. extruded toward gradient, created by NaOH diffusion, then contracted. This reversible motion repeated many times. Notably, NaCl diffusion produces monotonic irreversible extrusion. difference between two systems...

A vesicle that exhibits oscillatory structural changes under a pH gradient is reported. This composed of oleic acid and sodium oleate appears to exhibit stomatocyte-type or seemingly double spherical shape initially. The inner water located at one side the structure (i.e., swollen part). other nearly free water. When diffusion hydroxide anions causes gradient, rotates such its part faces higher-pH side. After this event, small hole in center begins open. torus-like structure: formed...

Abstract Single-walled carbon nanotubes (SWCNTs) are reported to spontaneously align in a rotational pattern by drying liquid droplet of toluene containing polyfluorene as dispersant. By situating an SWCNT solution around glass bead, spiral patterns generated. The parallel alignment SWCNTs along one stripe such is confirmed using scanning electron microscopy and polarized optical microscopy. orientation order increases toward the outer edge stripe. width proportional solute concentration,...

A centimeter-sized flat-headed push pin with photothermal properties can be moved on a water surface by simple near-infrared laser. Using light as an external stimulus allows for the remote control of timing, direction and velocity its locomotion. It has been clarified that vertical orientation at air-water interface affects friction locomotion, therefore acceleration. The placed point upward (a protruding into air phase) average distance 5.3 ± 2.9 cm following one pulse laser irradiation,...

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicrostructures of Concentrated Water-in-Oil Microemulsions in Sodium Bis(2-ethylhexyl) Sulfosuccinate and Phosphate SystemsK. Kurumada, Akihisa Shioi, Makoto HaradaCite this: J. Phys. Chem. 1994, 98, 47, 12382–12389Publication Date (Print):November 1, 1994Publication History Published online1 May 2002Published inissue 1 November 1994https://pubs.acs.org/doi/10.1021/j100098a037https://doi.org/10.1021/j100098a037research-articleACS...

We report the spontaneous formation of a characteristic periodic pattern through phase separation tripolymer solution comprising polyethylene-glycol (PEG)/dextran (DEX)/gelatin. When this is introduced into glass capillary with PEG-coated inner surface, we observe time-dependent growth microphase separation. Remarkably, self-organized, alignment DEX- and gelatin-rich microdroplets ensues, surrounded by PEG-rich phase. This demonstrates considerable stability, enduring for at least 8 h. The...

The phenomenon of collective motion Pt particles (primary and aggregates) immersed in water containing organic fuels has been observed. Over time, these tend to aggregate into numerous schools at the bottom container. Subsequently, unique spatiotemporal patterns emerge, including repetitive fission/fusion dynamics dispersing/clustering synchronization among schools. Notably, species influence observed patterns. exhibit self-propulsion through catalytic oxidation by dissolved oxygen,...

The growth mechanism of CdS ultrafine particles in water-in-oil microemulsions was investigated. occurs via a irreversible particle coagulation process. Its rate constant is dependent on the agglomeration number n. At small numbers, k about 107 dm3mol–1s–1. It decreases dramatically to 103 dm3mol–1s–1 at critical nc followed by further decrease above 2nc. This causes sharpening size distribution near and A simple model based process with n-dependent constants proposed, which explains well...