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Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 CONT

The Binary Colloidal Alloy Test-3 is an Exploration Systems’ transition flight experiment in the Human System Research and Technology area. BCAT-3 provides a unique opportunity to explore fundamental physics and simultaneously develop important future technology, including computers operating on light, complex biomolecular pharmaceuticals, clean sources of geothermal power, and novel rocket engines for interplanetary travel. These studies depend entirely on the microgravity environment provided by the International Space Station (ISS); in all other locations accessible to science, gravity dominates and precludes investigation of any other effects of interest. The experiment itself [consists of] photographing samples of colloidal particles with a digital camera onboard the ISS. Colloids are tiny nanoscale spheres of plexiglass a thousand times smaller than the width of a human hair (submicron radius) that are suspended in a fluid. They are ubiquitous (e.g., milk, smoke, and paint) and therefore interesting to study directly. Colloids are also small enough that they behave much like atoms and so can be used to model all sorts of phenomena because their size, shape, and interactions can be controlled. The 10 samples in BCAT-3 are made from the same ingredients, each a recipe with different proportions, and are grouped into three experiments: critical point, binary alloy, and surface crystallization. [Text followed by an illustration of a BCAT-3 sample holder.]  4, record 1, English, - binary%20alloy%20colloidal%20test

Record number: 1, Textual support number: 2 CONT

BCAT-3 is comprised of three separate experiments, which are individually referred to as a binary alloy(BCAT-3-BA), surface crystallization(BCAT-3-SC) and critical point(BCAT-3-CP). The critical point investigation is continuing with additional samples on future ISS [International Space Station] expeditions and will be referred to as Binary Colloidal Alloy Test-4. BCAT-4 will consist of two sets of samples referred to as BCAT-3 and 4 : Critical Point(BCAT-3-4-CP) and BCAT-4 : Polydisperse(BCAT-4-Poly).... The Binary Colloidal Alloy Test-3(BCAT-3) hardware supported three investigations in which ISS crews photographed samples of colloidal particles(tiny nanoscale spheres suspended in liquid) to document liquid/gas phase changes, growth of binary crystals, and the formation of colloidal crystals confined to a surface. Colloids are small enough that in a microgravity environment without sedimentation and convection, they behave much as atoms and so can be used to model all sorts of phenomena because their size, shape, and interactions can be controlled. The BCAT-3 payload consists of ten small samples of colloid alloys in which the microscopic colloid particles are mixed together into a liquid. These ten samples are contained within a small case that is the size of a school textbook. At the start of an experiment run, all ten samples are shaken to completely remix the colloid samples, much in the same way that salad dressing must be shaken to remix oil and vinegar. After the samples are mixed, what remains is periodically photographed using a digital camera until the colloid and liquid components of those samples have separated or the polymers have formed crystals. The samples can be remixed to repeat the experiment. The ten samples in BCAT-3 were selected as part of three separate experiments examining different physical processes : critical point, binary alloys, and surface crystallization.  5, record 1, English, - binary%20alloy%20colloidal%20test

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 OBS

Contexte: recherches en microgravité sur les structures colloïdales; test avec alliages binaires (c'est-à-dire composés de deux éléments) mis à l'état colloïdal.  2, record 1, French, - test%20BACT

Record number: 1, Textual support number: 2 OBS

test BACT (croissance d'alliages binaires à partir de particules colloïdales en suspension) : il faut articuler le syntagme pour rendre compte de la réalité du texte où il est question de la croissance de cristaux binaires qui se développent à partir de particules colloïdales en suspension dans un liquide.  1, record 1, French, - test%20BACT

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 CONT

Colloid chemistry. A subdivision of physical chemistry comprising the study of phenomena characteristic of matter when one or more of its dimensions lie in the range between 1 millimicron(nanometer) and 1 micron(micrometer)... Colloidal particles... occur in various types of suspensions(imprecisely called solutions), e. g., solid/gas(aerosol), solid/solid, liquid/liquid(emulsion), gas/liquid(foam)... Macromolecules(proteins and other high polymers) are at the lower limit of this range; the upper limit is usually taken to be the point at which the particles can be resolved in an optical microscope...  3, record 2, English, - colloidal%20particle

Record number: 2, Textual support number: 1 OBS

colloidal particle: term usually used in the plural (colloidal particles).  4, record 2, English, - colloidal%20particle

Record number: 2, Textual support number: 1 PHR

Colloidal clay particle.  2, record 2, English, - colloidal%20particle

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 CONT

Un colloïde est une dispersion de petites particules d'un matériau dans un autre (ex. sol, aérosol, émulsion). Les particules colloïdales sont des agrégats de nombreux atomes ou molécules. Leur diamètre < 500 nm (~ la longueur d'onde de la lumière visible). Elles sont trop petites pour être visibles avec un microscope optique ordinaire mais on peut les détecter par diffraction de la lumière, sédimentation ou osmose.  2, record 2, French, - particule%20collo%C3%AFdale

Record number: 2, Textual support number: 1 OBS

particule colloïdale : terme habituellement utilisé au pluriel (particules colloïdales).  3, record 2, French, - particule%20collo%C3%AFdale

Record number: 2, Textual support number: 1 PHR

Particule d'argile colloïdale.  4, record 2, French, - particule%20collo%C3%AFdale

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 DEF

the potential difference across an electric double layer usually between solid surface and a liquid.  3, record 3, English, - zeta%20potential

Record number: 3, Textual support number: 1 CONT

At a solid-liquid interface in a colloid system a composite double layer in the liquid in contact with the solid surface is called an electrical double layer. The inner layer is a bound layer of ions. The outer layer is diffuse and consists of ions of the opposite sign which are subject to thermal agitation. There is a potential difference across the diffuse layer between the bulk of the solution and the bound layer, known as the electrokinetic potential or zeta potential.  4, record 3, English, - zeta%20potential

Record number: 3, Textual support number: 1 OBS

electrokinetic potential; zeta potential: terms standardized by the International Electrotechnical Commission.  5, record 3, English, - zeta%20potential

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 CONT

Si par un processus quelconque, on déplace la phase liquide par rapport à la phase solide dans l'interface solide-liquide la couche moléculaire directement au contact de la surface s'y maintient solidement. La valeur du potentiel du plan qui sépare la couche fixe de la couche mobile est appelée potentiel zêta de Freundlich.  1, record 3, French, - potentiel%20z%C3%AAta%20de%20Freundlich

Record number: 3, Textual support number: 1 OBS

potentiel électrocinétique; potentiel zêta : termes normalisés par la Commission électrotechnique internationale.  4, record 3, French, - potentiel%20z%C3%AAta%20de%20Freundlich

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 OBS

The phosphate anion reversibly attached to the surface of the solid phase of the soil in such form that it may go into solution by anionic equilibrium reactions with isotopes of phosphorus or with other anions of the liquid phase without solution of the colloid phase to which it was attached.  1, record 4, English, - exchangeable%20phosphate

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 OBS

Anion de phosphate accolé de façon réversible à la surface de la phase solide d'un sol, de sorte qu'il peut être mis en solution par des réactions d'équilibre anionique avec des isotopes du phosphore ou d'autres anions de la phase liquide, sans qu'il y ait mise en solution de la phase colloïdale à laquelle il est accolé.  1, record 4, French, - phosphate%20%C3%A9changeable

Record 4,  Textual support,  Spanish