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  1. Pursuing "zero" protein adsorption of poly(carboxybetaine) from undiluted blood serum and plasma.

    Langmuir 25(19):11911 (2009) PMID 19583183

    Human blood serum and plasma pose significant challenges to blood-contacting devices and implanted materials because of their high nonspecific adsorption onto surfaces. In this work, we investigated nonspecific protein adsorption from single protein solutions and complex media such as undiluted ...
  2. Postformation Modification of SAMs: using click chemistry to functionalize organic surfaces.

    Langmuir 25(19):11480 (2009) PMID 19788212

    We have investigated a recently established strategy of modifying organic surfaces exposed by thiolate SAMs (self-assembled monolayers) deposited on Au substrates by employing so-called click chemistry. This term is used to denote a modified Huisgen 1,3-dipolar cycloaddition. We demonstrate the ...
  3. Enabling organosilicon chemistries on inert polymer surfaces with a vapor-deposited silica layer.

    Langmuir 25(19):11541 (2009) PMID 19655704

    Given the large surface area-to-volume ratios commonly encountered in microfluidics applications, the ability to engineer the chemical properties of surfaces encountered in these applications is critically important. However, as various polymers are rapidly replacing glass and silicon as the cho...
  4. Solvent-assisted dewetting during chemical vapor deposition.

    Langmuir 25(19):11555 (2009) PMID 19670895

    This study examines the use of a nonreactive solvent vapor, tert-butanol, during initiated chemical vapor deposition (iCVD) to promote polymer film dewetting. iCVD is a solventless technique to grow polymer thin films directly from gas phase feeds. Using a custom-built axisymmetric hot-zone reac...
  5. Generation of clean iron structures by electron-beam-induced deposition and selective catalytic decomposition of iron pentacarbonyl on Rh(110).

    Langmuir 25(19):11930 (2009) PMID 19630434

    We explore the electron-beam-induced deposition (EBID) of iron pentacarbonyl, Fe(CO)5, in ultrahigh vacuum (UHV) on clean and modified Rh(110) surfaces by scanning electron microscopy (SEM), scanning Auger microscopy (SAM), and local Auger electron spectroscopy (AES). In EBID a highly focused el...
  6. Synthesis and spectroscopic studies of composite gold nanorods with a double-shell structure composed of spacer and cyanine dye J-aggregate layers.

    Langmuir 25(19):11802 (2009) PMID 19655781

    The composite gold nanorods (Au NRs) having a double-shell structure composed of Au NR (core), spacer layer (inner shell), and J-aggregate (JA) layer (outer shell) have been synthesized to examine the spectroscopic properties of the hybrid system in which the localized surface plasmon is coupled...
  7. Anisotropic reversible aggregation of latex nanoparticles suspended in a lyotropic nematic liquid crystal: effect of gradients of biaxial order.

    Langmuir 25(19):11849 (2009) PMID 19702247

    We studied the anisotropic aggregation of spherical latex particles dispersed in a lyotropic liquid crystal presenting three nematic phases: calamitic, biaxial, and discotic. We observed that in the nematic calamitic phase aggregates of latex particles are formed, which become larger and anisotr...
  8. Interaction of cationic hydrophobic surfactants at negatively charged surfaces investigated by atomic force microscopy.

    Langmuir 25(19):11509 (2009) PMID 19746942

    Atomic force microscopy was used to study the adsorption of the surfactant octadecyl trimethyl ammonium chloride (C18TAC) at a low concentration (0.03 mM) to negatively charged surfaces in water. Atomic force microscopy tips were functionalized with dimethyloctadecyl(3-tripropyl)ammonium chlorid...
  9. Photosensor based on an FET utilizing a biocomponent of photosystem I for use in imaging devices.

    Langmuir 25(19):11969 (2009) PMID 19731941

    We have investigated a photosensor that consists of a field emission transistor (FET) utilizing the biocomponent of the photosystem I (PSI) protein complex for use in an imaging device. The PSI was immobilized on a gold electrode via the self-assembling monolayer (SAM) of 3-mercapto-1-propanesul...
  10. A peculiar phase transition of plasmalogen bilayer membrane under high pressure.

    Langmuir 25(19):11265 (2009) PMID 19697955

    The bilayer phase transition of plasmalogen, monounsaturated plasmenylcholine 1-O-1'-(Z)-octadecenyl-2-oleoyl-sn-glycero-3-phosphocholine (Plg-SOPC), was examined by differential scanning calorimetry, high-pressure transmittance, and fluorescence techniques. The bilayer properties of Plg-SOPC su...
  11. Effects of capillary condensation in adhesion between rough surfaces.

    Langmuir 25(19):11727 (2009) PMID 19788224

    Experiments on the effects of humidity in adhesion between rough surfaces have shown that the adhesion energy remains constant below a critical relative humidity (RHcr) and then abruptly jumps to a higher value at RHcr before approaching its upper limit at 100% relative humidity. A model based o...
  12. Dynamic behavior of giant liposomes at desired osmotic pressures.

    Langmuir 25(19):11680 (2009) PMID 19725557

    To apply accurate and uniform osmotic pressures to liposomes, they can be formed using the spontaneous transfer method in solutions with different osmolarities. The majority of liposomes unexpectedly opened large holes (several micrometers in diameter) in response to the osmotic pressure regardl...
  13. Nonreactive spreading at high-temperature revisited for metal systems via molecular dynamics.

    Langmuir 25(19):11450 (2009) PMID 19702248

    The spreading for Cu and Ag droplets on top of a rigid solid surface modeling Mo is herewith considered via molecular dynamics. The dynamics of the base radius and the contact angle are recorded and fitted using the molecular-kinetic theory. A method is described to determine for liquid metals a...
  14. Phase separation at the surface of poly(ethylene oxide)-containing biodegradable poly(L-lactic acid) blends.

    Langmuir 25(19):11467 (2009) PMID 19715326 PMCID PMC3965193

    The surface chemistry and in-depth distribution of the composition of a poly(ethylene oxide) (PEO)-containing biodegradable poly(L-lactic acid) (PLLA) blend matrix system have been investigated using X-ray photoelectron spectroscopy (XPS). This study reports detailed quantitative compositional i...
  15. Gold colloids with unconventional angled shapes.

    Langmuir 25(19):11431 (2009) PMID 19534459

    We report the formation of porous gold nanoparticles with unusual, angled shapes (such as nanocheckmarks) through spontaneous transformation of tellurium sacrificial templates by gradual galvanic replacement. High-resolution electron microscopy studies of intermediate stages reveal interesting i...
  16. The definition of "critical radius" for a collection of nanoparticles undergoing Ostwald ripening.

    Langmuir 25(19):11225 (2009) PMID 19715330

    An improved, exact analysis of surface Ostwald ripening of a collection of nanoparticles is presented in an effort to redefine the critical radius involved in the kinetic models of ripening. In a collection of supported particles of different sizes, the critical radius is the size of the particl...
  17. Preparation, characterization, and catalytic activity of core/shell Fe3O4@polyaniline@au nanocomposites.

    Langmuir 25(19):11835 (2009) PMID 19702253

    We report a new method to synthesize magnetically responsive Fe3O4@polyaniline@Au nanocomposites. The superparamagnetic Fe3O4@polyaniline with well-defined core/shell nanostructure has been synthesized via an ultrasound-assisted in situ surface polymerization method. The negatively charged Au na...
  18. Multiple particle tracking investigations of acid milk gels using tracer particles with designed surface chemistries and comparison with diffusing wave spectroscopy studies.

    Langmuir 25(19):11827 (2009) PMID 19788229

    Multiple particle tracking (MPT) has been used in an attempt to probe the heterogeneity of acid milk gels, made with and without added pectin, by following the distribution of the displacements of added tracer beads during and after gelation using the Van Hove distribution. Furthermore, the surf...
  19. Acute degradation of surface-bound unsaturated polyolefins in common solvents under ambient conditions.

    Langmuir 25(19):11250 (2009) PMID 19788207 PMCID PMC2756074

    We describe the detachment of covalently grafted polybutadiene and polynorbornene chains, which were prepared by surface-initiated ring-opening metathesis polymerization (SiROMP), from Si/SiO2 substrates upon brief exposure to common solvents in air. Degradation and disappearance of grafted poly...
  20. Patterned hybrid nanohole array surfaces for cell adhesion and migration.

    Langmuir 25(19):11236 (2009) PMID 19722551

    We report the fabrication of hybrid nanohole array surfaces to study the role of the surface nanoevironment on cell adhesion and cell migration. We use polystyrene beads and reactive ion etching to control the size and the spacing between nanoholes on a tailored self-assembled monolayer inert go...