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2016


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An electro-active polymer based lens module for dynamically varying focal system

Yun, S., Park, S., Nam, S., Park, B., Park, S. K., Mun, S., Lim, J. M., Kyung, K.

Applied Physics Letters, 109(14):141908, October 2016 (article)

Abstract
We demonstrate a polymer-based active-lens module allowing a dynamic focus controllable optical system with a wide tunable range. The active-lens module is composed of parallelized two active- lenses with a convex and a concave shaped hemispherical lens structure, respectively. Under opera- tion with dynamic input voltage signals, each active-lens produces translational movement bi-directionally responding to a hybrid driving force that is a combination of an electro-active response of a thin dielectric elastomer membrane and an electro-static attraction force. Since the proposed active lens module widely modulates a gap-distance between lens-elements, an optical system based on the active-lens module provides widely-variable focusing for selective imaging of objects in arbitrary position.

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link (url) DOI [BibTex]

2016


link (url) DOI [BibTex]


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Wrinkle structures formed by formulating UV-crosslinkable liquid prepolymers

Park, S. K., Kwark, Y., Nam, S., Park, S., Park, B., Yun, S., Moon, J., Lee, J., Yu, B., Kyung, K.

Polymer, 99, pages: 447-452, September 2016 (article)

Abstract
Artificial wrinkles have recently been in the spotlight due to their potential use in high-tech applications. A spontaneously wrinkled film can be fabricated from UV-crosslinkable liquid prepolymers. Here, we controlled the wrinkle formation by simply formulating two UV-crosslinkable liquid prepolymers, tetraethylene glycol bis(4-ethenyl-2,3,5,6-tetrafluorophenyl) ether (TEGDSt) and tetraethylene glycol diacrylate (TEGDA). The wrinkles were formed from the TEGDSt/TEGDA formulated prepolymer layers containing up to 30 wt% of TEGDA. The wrinkle formation depended upon the rate of photo-crosslinking reaction of the formulated prepolymers. The first order apparent rate constant, kapp, was between ca. 5.7 × 10−3 and 12.2 × 10−3 s−1 for the wrinkle formation. The wrinkle structures were modulated within the kapp mainly due to variation in the extent of shrinkage of the formulated prepolymer layers with the content of TEGDA

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


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Objective assessment of robotic surgical skill using instrument contact vibrations

Gomez, E. D., Aggarwal, R., McMahan, W., Bark, K., Kuchenbecker, K. J.

Surgical Endoscopy, 30(4):1419-1431, 2016 (article)

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[BibTex]

[BibTex]


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Cutaneous Feedback of Fingertip Deformation and Vibration for Palpation in Robotic Surgery

Pacchierotti, C., Prattichizzo, D., Kuchenbecker, K. J.

IEEE Transactions on Biomedical Engineering, 63(2):278-287, February 2016 (article)

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[BibTex]

[BibTex]


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Structure modulated electrostatic deformable mirror for focus and geometry control

Nam, S., Park, S., Yun, S., Park, B., Park, S. K., Kyung, K.

Optics Express, 24(1):55-66, OSA, January 2016 (article)

Abstract
We suggest a way to electrostatically control deformed geometry of an electrostatic deformable mirror (EDM) based on geometric modulation of a basement. The EDM is composed of a metal coated elastomeric membrane (active mirror) and a polymeric basement with electrode (ground). When an electrical voltage is applied across the components, the active mirror deforms toward the stationary basement responding to electrostatic attraction force in an air gap. Since the differentiated gap distance can induce change in electrostatic force distribution between the active mirror and the basement, the EDMs are capable of controlling deformed geometry of the active mirror with different basement structures (concave, flat, and protrusive). The modulation of the deformed geometry leads to significant change in the range of the focal length of the EDMs. Even under dynamic operations, the EDM shows fairly consistent and large deformation enough to change focal length in a wide frequency range (1~175 Hz). The geometric modulation of the active mirror with dynamic focus tunability can allow the EDM to be an active mirror lens for optical zoom devices as well as an optical component controlling field of view.

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


Gaussian Process-Based Predictive Control for Periodic Error Correction
Gaussian Process-Based Predictive Control for Periodic Error Correction

Klenske, E. D., Zeilinger, M., Schölkopf, B., Hennig, P.

IEEE Transactions on Control Systems Technology , 24(1):110-121, 2016 (article)

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PDF DOI [BibTex]

PDF DOI [BibTex]


Dual Control for Approximate Bayesian Reinforcement Learning
Dual Control for Approximate Bayesian Reinforcement Learning

Klenske, E. D., Hennig, P.

Journal of Machine Learning Research, 17(127):1-30, 2016 (article)

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PDF link (url) [BibTex]

PDF link (url) [BibTex]


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Self-diffusiophoresis of chemically active colloids

Popescu, M. N., Uspal, W. E., Dietrich, S.

The European Physical Journal Special Topics, 225(11-12):2189-2206, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Perpetual superhydrophobicity

Giacomello, A., Schimmele, L., Dietrich, S., Tasinkevych, M.

Soft Matter, 12, pages: 8927-8934, Royal Society of Chemistry, Cambridge, UK, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Molecular dynamics simulation of a binary mixture near the lower critical point

Pousaneh, F., Edholm, O., Maciolek, A.

The Journal of Chemical Physics, 145(1), American Institute of Physics, Woodbury, N.Y., 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Effective Interaction between Active Colloids and Fluid Interfaces Induced by Marangoni Flows

Dom\’\inguez, A., Malgaretti, P., Popescu, M. N., Dietrich, S.

Physical Review Letters, 116, American Physical Society, Woodbury, N.Y., 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Dynamics of Novel Photoactive AgCl Microstars and Their Environmental Applications

Simmchen, J., Baeza, A., Miguel-Lopez, A., Stanton, M. M., Vallet-Regi, M., Ruiz-Molina, D., Sánchez, S.

ChemNanoMat, 3(1):65-71, Wiley, Weinheim, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Wetting hysteresis induced by nanodefects

Giacomello, A., Schimmele, L., Dietrich, S.

Proceedings of the National Academy of Sciences of the United States of America, 113(3):E262-E271, National Academy of Sciences, Washington, D.C., 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Three-phase contact line and line tension of electrolyte solutions in contact with charged substrates

Ibagon, I., Bier, M., Dietrich, S.

Journal of Physics: Condensed Matter, 28(24), IOP Publishing, Bristol, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Smart biosensors for multiplexed and fully integrated point-of-care diagnostics

Romeo, A., Leung, T. S., Sanchez, S.

Lab on a Chip, 16(11):1957-1961, Royal Society of Chemistry, Cambridge, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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The sequential activation of the mitotic microtubule assembly pathways favors bipolar spindle formation

Cavazza, T., Malgaretti, P., Vernos, I.

Molecular Biology of the Cell, 27(19):2935-2945, American Society for Cell Biology, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Entropically induced asymmetric passage times of charged tracers across corrugated channels

Malgaretti, P., Pagonabarraga, I., Rubi, J. M.

The Journal of Chemical Physics, 144(3), American Institute of Physics, Woodbury, N.Y., 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Peripheral vs. central determinants of vibrotactile adaptation

Klöcker, A., Gueorguiev, D., Thonnard, J. L., Mouraux, A.

Journal of Neurophysiology, 115(2):685-691, 2016, PMID: 26581868 (article)

Abstract
Long-lasting mechanical vibrations applied to the skin induce a reversible decrease in the perception of vibration at the stimulated skin site. This phenomenon of vibrotactile adaptation has been studied extensively, yet there is still no clear consensus on the mechanisms leading to vibrotactile adaptation. In particular, the respective contributions of 1) changes affecting mechanical skin impedance, 2) peripheral processes, and 3) central processes are largely unknown. Here we used direct electrical stimulation of nerve fibers to bypass mechanical transduction processes and thereby explore the possible contribution of central vs. peripheral processes to vibrotactile adaptation. Three experiments were conducted. In the first, adaptation was induced with mechanical vibration of the fingertip (51- or 251-Hz vibration delivered for 8 min, at 40× detection threshold). In the second, we attempted to induce adaptation with transcutaneous electrical stimulation of the median nerve (51- or 251-Hz constant-current pulses delivered for 8 min, at 1.5× detection threshold). Vibrotactile detection thresholds were measured before and after adaptation. Mechanical stimulation induced a clear increase of vibrotactile detection thresholds. In contrast, thresholds were unaffected by electrical stimulation. In the third experiment, we assessed the effect of mechanical adaptation on the detection thresholds to transcutaneous electrical nerve stimuli, measured before and after adaptation. Electrical detection thresholds were unaffected by the mechanical adaptation. Taken together, our results suggest that vibrotactile adaptation is predominantly the consequence of peripheral mechanoreceptor processes and/or changes in biomechanical properties of the skin.

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


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Topographical pathways guide chemical microswimmers

Simmchen, J., Katuri, J., Uspal, W., Popescu, M. N., Tasinkevych, M., Sanchez, S.

Nature Communications, 7, Nature Publishing Group, London, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Fluctuational electrodynamics for nonlinear media

Soo, H., Krüger, M.

EPL, 115(4), EDP Science, Les-Ulis, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Poisson-Boltzmann study of the effective electrostatic interaction between colloids at an electrolyte interface

Majee, A., Bier, M., Dietrich, S.

The Journal of Chemical Physics, 145(6), American Institute of Physics, Woodbury, N.Y., 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Bubble-Free Propulsion of Ultrasmall Tubular Nanojets Powered by Biocatalytic Reactions

Ma, X., Hortelao, A. C., Miquel-Lopez, A., Sanchez, S.

Journal of the American Chemical Society, 138(42):13782-13785, American Chemical Society, Washington, DC, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Wetting and orientation of catalytic Janus colloids at the surface of water

Wang, X., In, M., Blanc, C., Malgaretti, P., Nobilia, M., Stocco, A.

Faraday Discussions, 191, pages: 305-324, Royal Society of Chemistry, London, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Collective dynamics of chemically active particles trapped at a fluid interface

Dom\’\inguez, A., Malgaretti, P., Popescu, M. N., Dietrich, S.

Soft Matter, 12(40):8398-8406, Royal Society of Chemistry, Cambridge, UK, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Guiding Catalytically Active Particles with Chemically Patterned Surfaces

Uspal, W. E., Popescu, M. N., Dietrich, S., Tasinkevych, M.

Physical Review Letters, 117(4), American Physical Society, Woodbury, N.Y., 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Structure and dynamics of binary liquid mixtures near their continuous demixing transitions

Roy, S., Höfling, F., Dietrich, S.

The Journal of Chemical Physics, 145(4), American Institute of Physics, Woodbury, N.Y., 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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A dynamic DFT approach to generalized diffusion equations in a system with long-ranged and hydrodynamic interactions

Bleibel, J., Dominguez, A., Oettel, M.

Journal of Physics: Condensed Matter, 28(24), IOP Publishing, Bristol, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Rectification and Non-Gaussian Diffusion in Heterogeneous Media

Malgaretti, P., Pagonabarraga, I., Rubi, J. M.

Entropy, 18(11), Molecular Diversity Preservation International, Basel, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Lateral critical Casimir force in two\textendashdimensional inhomogeneous Ising strip. Exact results

Nowakowski, P., Napiorkowski, M.

The Journal of Chemical Physics, 144(21), 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Silent Expectations: Dynamic Causal Modeling of Cortical Prediction and Attention to Sounds That Weren’t

Chennu, S., Noreika, V., Gueorguiev, D., Shtyrov, Y., Bekinschtein, T. A., Henson, R.

Journal of Neuroscience, 36(32):8305-8316, Society for Neuroscience, 2016 (article)

Abstract
There is increasing evidence that human perception is realized by a hierarchy of neural processes in which predictions sent backward from higher levels result in prediction errors that are fed forward from lower levels, to update the current model of the environment. Moreover, the precision of prediction errors is thought to be modulated by attention. Much of this evidence comes from paradigms in which a stimulus differs from that predicted by the recent history of other stimuli (generating a so-called {\textquotedblleft}mismatch response{\textquotedblright}). There is less evidence from situations where a prediction is not fulfilled by any sensory input (an {\textquotedblleft}omission{\textquotedblright} response). This situation arguably provides a more direct measure of {\textquotedblleft}top-down{\textquotedblright} predictions in the absence of confounding {\textquotedblleft}bottom-up{\textquotedblright} input. We applied Dynamic Causal Modeling of evoked electromagnetic responses recorded by EEG and MEG to an auditory paradigm in which we factorially crossed the presence versus absence of {\textquotedblleft}bottom-up{\textquotedblright} stimuli with the presence versus absence of {\textquotedblleft}top-down{\textquotedblright} attention. Model comparison revealed that both mismatch and omission responses were mediated by increased forward and backward connections, differing primarily in the driving input. In both responses, modeling results suggested that the presence of attention selectively modulated backward {\textquotedblleft}prediction{\textquotedblright} connections. Our results provide new model-driven evidence of the pure top-down prediction signal posited in theories of hierarchical perception, and highlight the role of attentional precision in strengthening this prediction.SIGNIFICANCE STATEMENT Human auditory perception is thought to be realized by a network of neurons that maintain a model of and predict future stimuli. Much of the evidence for this comes from experiments where a stimulus unexpectedly differs from previous ones, which generates a well-known {\textquotedblleft}mismatch response.{\textquotedblright} But what happens when a stimulus is unexpectedly omitted altogether? By measuring the brain{\textquoteright}s electromagnetic activity, we show that it also generates an {\textquotedblleft}omission response{\textquotedblright} that is contingent on the presence of attention. We model these responses computationally, revealing that mismatch and omission responses only differ in the location of inputs into the same underlying neuronal network. In both cases, we show that attention selectively strengthens the brain{\textquoteright}s prediction of the future.

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link (url) DOI [BibTex]

link (url) DOI [BibTex]


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One for all?! Simultaneous examination of load-inducing factors for advancing media-related instructional research

Wirzberger, M., Beege, M., Schneider, S., Nebel, S., Rey, G. D.

Computers {\&} Education, 100, pages: 18-31, Elsevier BV, 2016 (article)

Abstract
In multimedia learning settings, limitations in learners' mental resource capacities need to be considered to avoid impairing effects on learning performance. Based on the prominent and often quoted Cognitive Load Theory, this study investigates the potential of a single experimental approach to provide simultaneous and separate measures for the postulated load-inducing factors. Applying a basal letter-learning task related to the process of working memory updating, intrinsic cognitive load (by varying task complexity), extraneous cognitive load (via inducing split-attention demands) and germane cognitive load (by varying the presence of schemata) were manipulated within a 3 × 2 × 2-factorial full repeated-measures design. The performance of a student sample (N = 96) was inspected regarding reaction times and errors in updating and recall steps. Approaching the results with linear mixed models, the effect of complexity gained substantial strength, whereas the other factors received at least partial significant support. Additionally, interactions between two or all load-inducing factors occurred. Despite various open questions, the study comprises a promising step for the empirical investigation of existing construction yards in cognitive load research.

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DOI [BibTex]

DOI [BibTex]


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Tailoring three-dimensional architectures by rolled-up nanotechnology for mimicking microvasculatures

Arayanarakool, R., Meyer, A. K., Helbig, L., Sanchez, S., Schmidt, O. G.

Lab on a Chip, 15(14):2981-2989, Royal Society of Chemistry, Cambridge, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Flexible sensors for biomedical technology

Vilela, D., Romeo, A., Sanchez, S.

Lab on a Chip, 16(3):402-408, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Mechanical stability of bipolar spindle assembly

Malgaretti, P., Muhuri, S.

EPL, 115(2), EDP Science, Les-Ulis, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Reversed Janus micro/nanomotors with internal chemical engine

Ma, X., Jang, S., Popescu, M. N., Uspal, W. E., Miguel-López, A., Hahn, K., Kim, D., Sanchez, S.

ACS Nano, 10(9):8751-8759, American Chemical Society, Washington, DC, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Driven colloidal fluids: construction of dynamical density functional theories from exactly solvable limits

Scacchi, A., Krüger, M., Brader, J. M.

Journal of Physics: Condensed Matter, 28(24), IOP Publishing, Bristol, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Flight of a heavy particle nonlinearly coupled to a quantum bath

Maghrebi, M. F., Krüger, M., Kardar, M.

Physical Review B, 93(1), American Physical Society, Woodbury, NY, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir forces between defects in the 2D Ising model

Nowakowski, P., Maciolek, A., Dietrich, S.

Journal of Physics A: Mathematical and Theoretical, 49(48), IOP Pub., Bristol, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Miniaturized soft bio-hybrid robotics: a step forward into healthcare applications

Patino, T., Mestre, R., Sanchez, S.

Lab on a Chip, 16(19):3626-3630, Royal Society of Chemistry, Cambridge, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Characterizing anomalous diffusion in crowded polymer solutions and gels over five decades in time with variable-lengthscale fluorescence correlation spectroscopy

Banks, Daniel S, Tressler, Charmaine, Peters, Robert D, Höfling, Felix, Fradin, Cécile

Soft Matter, 12(18):4190-4203, Royal Society of Chemistry, Cambridge, UK, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Slip Length Enhancement in Nanofluidic Flow using Nanotextured Superhydrophobic Surfaces

Heverhagen, Jonas, Tasinkevych, M., Rahman, A., Black, C.T., Checco, A.

Advanced Materials Interfaces, 3(17), Wiley-VCH, Weinheim, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Touch uses frictional cues to discriminate flat materials

Gueorguiev, D., Bochereau, S., Mouraux, A., Hayward, V., Thonnard, J.

Scientific reports, 6, pages: 25553, Nature Publishing Group, 2016 (article)

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[BibTex]

[BibTex]


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Active colloids at fluid interfaces

Malgaretti, P., Popescu, M. N., Dietrich, S.

Soft Matter, 12(17):4007-4023, Royal Society of Chemistry, Cambridge, UK, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical adsorption and critical Casimir forces in the canonical ensemble

Gross, M., Vasilyev, O., Gambassi, A., Dietrich, S.

Physical Review E, 94(2), American Physical Society, Melville, NY, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Critical Casimir interactions between Janus particles

Labbe-Laurent, M., Dietrich, S.

Soft Matter, 12(31):6621-6648, Royal Society of Chemistry, Cambridge, UK, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Motion Control of Urea-Powerde Biocompatible Hollow Microcapsule

Ma, X., Wang, X., Hahn, K., Sanchez, S.

ACS Nano, 10(3):3597-3605, American Chemical Society, Washington, DC, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Enzyme Catalysis To Power Micro/Nanomachines

Ma, X., Hortelao, A. C., Patino, T., Sanchez, S.

ACS Nano, 10(10):9111-9122, American Chemical Society, Washington, DC, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Microfluidic fuel cells for energy generation

Safdar, M., Jänis, J., Sanchez, S.

Lab on a Chip, 16(15):2754-2758, Royal Society of Chemistry, Cambridge, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Reusable and Long-Lasting Active Microcleaners for Heterogeneous Water Remediation

Parmar, J., Vilela, D., Pellicer, E., Esque-de-los Ojos, D., Sort, J., Sanchez, S.

Advanced Functional Materials, 26(23):4152-4161, Wiley-VCH Verlag GmbH, Weinheim, 2016 (article)

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DOI [BibTex]

DOI [BibTex]


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Self-Assembly of Micromachining Systems Powered by Janus Micromotors

Maggi, C., Simmchen, J., Saglimbeni, F., Katuri, J., Dipalo, M., De Angelis, F., Sanchez, S., Di Leonardo, R.

Small, 12(4):446-451, Wiley, Weinheim, Germany, 2016 (article)

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DOI [BibTex]

DOI [BibTex]