The Experts below are selected from a list of 135 Experts worldwide ranked by ideXlab platform

Raymond R Dagastine - One of the best experts on this subject based on the ideXlab platform.

  • Direct Force Measurement at Liquid/Liquid Interfaces
    Solvent Extraction Research and Development-japan, 2020
    Co-Authors: Raymond R Dagastine, Geoffery W. Stevens
    Abstract:

    Solvent extraction processes are widely used to purify, recover or recycle solutes, by transferring it from an aqueous phase to an organic phase. In these processes, the Direct contact between the two liquids at the oil-water interface is an important factor. Increasing the interfacial areas by drop breakage and fast droplet coalescence will lead to an enhancement in process efficiency. Controlling the interaction between droplets and the Forces acting at liquid-liquid interfaces is one of the key factors in controlling these processes. Therefore, a fundamental understanding of interaction Forces at liquid-liquid interfaces is required, but they are not yet well understood and their Direct Measurements remain a challenge. In this article we review recent experimental techniques used to measure Forces at liquid-liquid interfaces.

  • sphere to rod transitions in self assembled systems probed using Direct Force Measurement
    Soft Matter, 2015
    Co-Authors: Christopher J Fewkes, Raymond R Dagastine, Richard Francis Tabor
    Abstract:

    The influence of nanoparticle shape, in particular the sphere to rod transition, on surface Forces and consequently the properties of colloidal fluids is an interesting but not well investigated phenomenon. Here, the surface Force behaviour of concentrated surfactant solutions containing cetyltrimethylammonium bromide and sodium salicylate with micelle shapes varying from slightly prolate to high aspect ratio rods was measured. Atomic Force microscopy (AFM) with both rigid particle and soft droplet probes was used with comparisons and analysis made using the Chan–Dagastine–White model. It is observed that small changes to the micelle shape result in no discernable differences to the surface Force behaviour, however, once the micelles are elongated significantly, the long range Forces adjust in nature from oscillatory to that of a single attractive Force well. This highlights the importance that nanocolloid shape has on the behaviour and properties of emulsions and other colloidal fluids, specifically for emulsion flocculation and handling in systems of rod and worm like micelles.

  • Dynamic Forces between two deformable oil droplets in water
    Science, 2006
    Co-Authors: Raymond R Dagastine, D. Y.c. Chan, Rogerio Manica, Geoffrey W Stevens, Steven L Carnie, Franz Grieser
    Abstract:

    The understanding of static interactions in colloidal suspensions is well established, whereas dynamic interactions more relevant to biological and other suspended soft-matter systems are less well understood. We present the Direct Force Measurement and quantitative theoretical description for dynamic Forces for liquid droplets in another immiscible fluid. Analysis of this system demonstrates the strong link between interfacial deformation, static surface Forces, and hydrodynamic drainage, which govern dynamic droplet-droplet interactions over the length scale of nanometers and over the time scales of Brownian collisions. The results and analysis have Direct bearing on the control and manipulation of suspended droplets in soft-matter systems ranging from the emulsions in shampoo to cellular interactions.

Dieter Kohn - One of the best experts on this subject based on the ideXlab platform.

  • Resulting Tensile Forces in the Human Bone–Patellar Tendon–Bone Graft: Direct Force Measurement In Vitro
    Arthroscopy, 1999
    Co-Authors: Stefan Rupp, Th. Hopf, Thomas Hess, Romain Seil, Dieter Kohn
    Abstract:

    Abstract Summary: The objective of this study was to measure the resultant Force in the human bone–patellar tendon–bone graft after reconstruction of the anterior cruciate ligament under various conditions in vitro. Seven fresh-frozen cadaver lower extremities were used. Force Measurement was made with a quartz Force transducer mounted in a specially designed load cell. The effect of passive extension movement, quadriceps pull, varus torque, and valgus torque on the resultant Force in the ligament were investigated. Passive extension of the joint generated a rapid increase of Force in the graft between 30° and 0° of flexion, reaching its maximum (128 ± 25 N) at full extension. When quadriceps pull was applied to extend the joint, resultant Force increased at 50° of flexion and reached its maximum (219 ± 25 N) at full extension. Additional resistance applied to the level of the ankle joint generated an additional load of the graft. Increase of Forces in the ligament resulted from both varus and valgus applied moments. Arthroscopy: The Journal of Arthroscopic and Related Surgery, Vol 15, No 2 (March), 1999: pp 179–184

  • resulting tensile Forces in the human bone patellar tendon bone graft Direct Force Measurement in vitro
    Arthroscopy, 1999
    Co-Authors: Stefan Rupp, Th. Hopf, Thomas Hess, Romain Seil, Dieter Kohn
    Abstract:

    Abstract Summary: The objective of this study was to measure the resultant Force in the human bone–patellar tendon–bone graft after reconstruction of the anterior cruciate ligament under various conditions in vitro. Seven fresh-frozen cadaver lower extremities were used. Force Measurement was made with a quartz Force transducer mounted in a specially designed load cell. The effect of passive extension movement, quadriceps pull, varus torque, and valgus torque on the resultant Force in the ligament were investigated. Passive extension of the joint generated a rapid increase of Force in the graft between 30° and 0° of flexion, reaching its maximum (128 ± 25 N) at full extension. When quadriceps pull was applied to extend the joint, resultant Force increased at 50° of flexion and reached its maximum (219 ± 25 N) at full extension. Additional resistance applied to the level of the ankle joint generated an additional load of the graft. Increase of Forces in the ligament resulted from both varus and valgus applied moments. Arthroscopy: The Journal of Arthroscopic and Related Surgery, Vol 15, No 2 (March), 1999: pp 179–184

Stefan Rupp - One of the best experts on this subject based on the ideXlab platform.

  • Resulting Tensile Forces in the Human Bone–Patellar Tendon–Bone Graft: Direct Force Measurement In Vitro
    Arthroscopy, 1999
    Co-Authors: Stefan Rupp, Th. Hopf, Thomas Hess, Romain Seil, Dieter Kohn
    Abstract:

    Abstract Summary: The objective of this study was to measure the resultant Force in the human bone–patellar tendon–bone graft after reconstruction of the anterior cruciate ligament under various conditions in vitro. Seven fresh-frozen cadaver lower extremities were used. Force Measurement was made with a quartz Force transducer mounted in a specially designed load cell. The effect of passive extension movement, quadriceps pull, varus torque, and valgus torque on the resultant Force in the ligament were investigated. Passive extension of the joint generated a rapid increase of Force in the graft between 30° and 0° of flexion, reaching its maximum (128 ± 25 N) at full extension. When quadriceps pull was applied to extend the joint, resultant Force increased at 50° of flexion and reached its maximum (219 ± 25 N) at full extension. Additional resistance applied to the level of the ankle joint generated an additional load of the graft. Increase of Forces in the ligament resulted from both varus and valgus applied moments. Arthroscopy: The Journal of Arthroscopic and Related Surgery, Vol 15, No 2 (March), 1999: pp 179–184

  • resulting tensile Forces in the human bone patellar tendon bone graft Direct Force Measurement in vitro
    Arthroscopy, 1999
    Co-Authors: Stefan Rupp, Th. Hopf, Thomas Hess, Romain Seil, Dieter Kohn
    Abstract:

    Abstract Summary: The objective of this study was to measure the resultant Force in the human bone–patellar tendon–bone graft after reconstruction of the anterior cruciate ligament under various conditions in vitro. Seven fresh-frozen cadaver lower extremities were used. Force Measurement was made with a quartz Force transducer mounted in a specially designed load cell. The effect of passive extension movement, quadriceps pull, varus torque, and valgus torque on the resultant Force in the ligament were investigated. Passive extension of the joint generated a rapid increase of Force in the graft between 30° and 0° of flexion, reaching its maximum (128 ± 25 N) at full extension. When quadriceps pull was applied to extend the joint, resultant Force increased at 50° of flexion and reached its maximum (219 ± 25 N) at full extension. Additional resistance applied to the level of the ankle joint generated an additional load of the graft. Increase of Forces in the ligament resulted from both varus and valgus applied moments. Arthroscopy: The Journal of Arthroscopic and Related Surgery, Vol 15, No 2 (March), 1999: pp 179–184

Georg Papastavrou - One of the best experts on this subject based on the ideXlab platform.

  • probing multivalent host guest interactions between modified polymer layers by Direct Force Measurement
    Journal of Physical Chemistry B, 2011
    Co-Authors: Oznur Kaftan, Simonetta Tumbiolo, Frederic Dubreuil, Rachel Auzelyvelty, Andreas Fery, Georg Papastavrou
    Abstract:

    The adhesion behavior between modified polysaccharide layers capable of forming host–guest complexes has been determined by Direct Force Measurements with the atomic Force microscope (AFM). Polysaccharides bearing either host or guest moieties were obtained by derivatization of chitosan with pendant β-cyclodextrin (CD) and adamantane (AD) moieties, respectively. These modified polysaccharides were covalently immobilized either to flat surfaces or to AFM-probes. The number of interacting polymer segments has been reduced significantly by covalently immobilizing chitosan to an AFM-tip with small radius and measuring the Forces between the protruding polymer segments and a chitosan layer immobilized to a flat surface. By this approach, it was possible to determine the interaction between polymer layers on the level of single polymer strands. To separate contributions to the adhesion due to the formation of host–guest complexes from unspecific interactions, we performed Measurements between various combinatio...

Romain Seil - One of the best experts on this subject based on the ideXlab platform.

  • Resulting Tensile Forces in the Human Bone–Patellar Tendon–Bone Graft: Direct Force Measurement In Vitro
    Arthroscopy, 1999
    Co-Authors: Stefan Rupp, Th. Hopf, Thomas Hess, Romain Seil, Dieter Kohn
    Abstract:

    Abstract Summary: The objective of this study was to measure the resultant Force in the human bone–patellar tendon–bone graft after reconstruction of the anterior cruciate ligament under various conditions in vitro. Seven fresh-frozen cadaver lower extremities were used. Force Measurement was made with a quartz Force transducer mounted in a specially designed load cell. The effect of passive extension movement, quadriceps pull, varus torque, and valgus torque on the resultant Force in the ligament were investigated. Passive extension of the joint generated a rapid increase of Force in the graft between 30° and 0° of flexion, reaching its maximum (128 ± 25 N) at full extension. When quadriceps pull was applied to extend the joint, resultant Force increased at 50° of flexion and reached its maximum (219 ± 25 N) at full extension. Additional resistance applied to the level of the ankle joint generated an additional load of the graft. Increase of Forces in the ligament resulted from both varus and valgus applied moments. Arthroscopy: The Journal of Arthroscopic and Related Surgery, Vol 15, No 2 (March), 1999: pp 179–184

  • resulting tensile Forces in the human bone patellar tendon bone graft Direct Force Measurement in vitro
    Arthroscopy, 1999
    Co-Authors: Stefan Rupp, Th. Hopf, Thomas Hess, Romain Seil, Dieter Kohn
    Abstract:

    Abstract Summary: The objective of this study was to measure the resultant Force in the human bone–patellar tendon–bone graft after reconstruction of the anterior cruciate ligament under various conditions in vitro. Seven fresh-frozen cadaver lower extremities were used. Force Measurement was made with a quartz Force transducer mounted in a specially designed load cell. The effect of passive extension movement, quadriceps pull, varus torque, and valgus torque on the resultant Force in the ligament were investigated. Passive extension of the joint generated a rapid increase of Force in the graft between 30° and 0° of flexion, reaching its maximum (128 ± 25 N) at full extension. When quadriceps pull was applied to extend the joint, resultant Force increased at 50° of flexion and reached its maximum (219 ± 25 N) at full extension. Additional resistance applied to the level of the ankle joint generated an additional load of the graft. Increase of Forces in the ligament resulted from both varus and valgus applied moments. Arthroscopy: The Journal of Arthroscopic and Related Surgery, Vol 15, No 2 (March), 1999: pp 179–184