نتایج جستجو برای: stable colloids
تعداد نتایج: 266421 فیلتر نتایج به سال:
Achieving control over the directionality of active colloids is essential for their use in practical applications such as cargo carriers in microfluidic devices. So far, guidance of spherical Janus colloids was mainly realized using specially engineered magnetic multilayer coatings combined with external magnetic fields. Here we demonstrate that step-like submicrometre topographical features ca...
Well-defi ned, functional colloids provide critical model systems for a variety of fundamental phenomena in materials and soft matter, and enable a broad range of technological applications from optics [ 1 ] to biotechnology. [ 2 ] The ability to fabricate large quantities of colloids with high uniformity and specifi ed shape and function has thus been greatly desired. For example, magnetic col...
Recent advances in the synthesis of polymeric colloids have opened the doors to new advanced materials. There is strong interest in using these new techniques to produce particles that mimic and/or interact with biological systems. An important characteristic of biological systems that has not yet been exploited in synthetic polymeric colloids is their wide range of deformability. A canonical e...
We report on the photoconductive response of nanostructured sol-gel films in function of the silver nitrate concentration (ions and colloids). Silver colloids were obtained by spontaneous reduction process of Ag+ ions to Ag(0). 2-d hexagonal nanosructured sol-gel thin films were prepared by dip-coating method using the non-ionic diblock copolymer Brij58 to produce channels into the film, which ...
The deposition behaviors of carboxylate-modified polystyrene latex microspheres (six sizes ranging from 0.1 to 2.0 microm) in packed porous media (soda-lime glass beads) were examined under a variety of environmentally relevant pore fluid velocities (4-8 m-day(-1)) in the presence of an energy barrier to deposition. Hyperexponential profiles of retained colloids were observed for all microspher...
IMPORTANCE Evidence supporting the choice of intravenous colloid vs crystalloid solutions for management of hypovolemic shock remains unclear. OBJECTIVE To test whether use of colloids compared with crystalloids for fluid resuscitation alters mortality in patients admitted to the intensive care unit (ICU) with hypovolemic shock. DESIGN, SETTING, AND PARTICIPANTS A multicenter, randomized cl...
In this brief review, we give an introduction to selected colloidal and microfluidic nematic microstructures, as enabled by the inherent anisotropy microscopic orientational ordering in complex liquid crystalline materials. We a overview of mesoscopic theory, for equilibrium dynamics, fluids, that provides framework understanding, characterization, even prediction such with particular comment a...
Coupling reactions, most prominently Heck and Suzuki couplings but also Sonogashira coupling and allylic substitution, are established catalytic transformations for the synthesis of fine chemicals. The recovery of catalytically active complexes from such coupling reactions, by the concept of covalent binding to soluble polymers, has been studied by various research groups. This research, addres...
Digital colloids, a cluster of freely rotating "halo" particles tethered to the surface of a central particle, were recently proposed as ultra-high density memory elements for information storage. Rational design of these digital colloids for memory storage applications requires a quantitative understanding of the thermodynamic and kinetic stability of the configurational states within which in...
Structural transformations of superparamagnetic colloids confined within self-assembled microtubes are studied by systematically varying tube-colloid size ratios and external magnetic field directions. A magnetic field parallel to microtubes may stretch non-linear chains like zigzag chains into linear chains. Non-parallel fields induce new structures including repulsive chains of single colloid...
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