7,142 Hits in 6.5 sec

Colloidal aggregates tested via nanoindentation and simultaneous 3D imaging [article]

Marcel Roth, Carsten Schilde, Philipp Lellig, Arno Kwade, Günter K. Auernhammer
2012 arXiv   pre-print
The mechanical properties of aggregated colloids depend on the mutual interplay of inter-particle potentials, contact forces, aggregate structure and material properties of the bare particles.  ...  The aim of the present paper was to relate both macroscopic and microscopic mechanical data with each other and simple analytical models.  ...  M.R. is a recipient of a fellowship through funding of the Excellence Initiative (DFG/GSC 266).  ... 
arXiv:1102.4233v3 fatcat:3islwz2qafdavkalkz6nzh5wfu

Spontaneous nucleation on flat surface by depletion force in colloidal suspension

Nobutomo Nakamura, Yuto Sakamoto, Hirotsugu Ogi
2021 Scientific Reports  
Nucleation by sedimentation of colloidal particles on a flat surface is experimentally observed, and effect of attractive depletion force generated by polymers on nucleation is investigated.  ...  Sedimentation forms polycrystalline colloidal crystal on a flat surface, and above the threshold polymer concentration, ratio of the spontaneous nucleation increases, resulting in a decrease in the grain  ...  For these features, colloidal system has been attracting attention in the field of material science for modeling atomic system that is experimentally inaccessible.  ... 
doi:10.1038/s41598-021-87626-9 pmid:33903604 fatcat:jte6of4kgbakzer3qe27btpmaa

Determination of solid surface tension from particle–substrate pull-off forces measured with the atomic force microscope

Jaroslaw Drelich, Garth W. Tormoen, Elvin R. Beach
2004 Journal of Colloid and Interface Science  
Atomic force microscopy (AFM) is capable of solid surface characterization at the microscopic and submicroscopic scales.  ...  Although a majority of the literature γ results was obtained using either Johnson-Kendall-Roberts (JKR) or Derjaguin-Muller-Toporov (DMT) models, re-analysis of the published experimental data presented  ...  Acknowledgment Financial support provided by the Petroleum Research Fund and administrated by the American Chemical Society is gratefully acknowledged.  ... 
doi:10.1016/j.jcis.2004.08.002 pmid:15533421 fatcat:nr2l32jxlbhudithabsxsyp56q

Mechanical oscillation accelerating nucleation and nuclei growth in hard-sphere colloidal glass

Nobutomo Nakamura, Shizuka Nakashima, Hirotsugu Ogi
2019 Scientific Reports  
In this study, we observe nucleation and nuclei growth caused by mechanical oscillation in a hard-sphere colloidal glass and evaluate the effect of mechanical oscillation on the structural evolution in  ...  These behaviors indicate that crystallization is related to the atomic motion in the glass state, and it is suggested that the activation of specific atomic motion can cause crystallization without increasing  ...  The authors thank Kyosuke Inayama for his support of experiment.  ... 
doi:10.1038/s41598-019-49120-1 pmid:31492865 pmcid:PMC6731250 fatcat:xmi2kzwajjabfo4uiagpq4loxi

Controlling competition between crystallization and glass formation in binary colloids with an external field

C Patrick Royall, Esther C M Vermolen, Alfons van Blaaderen, Hajime Tanaka
2008 Journal of Physics: Condensed Matter  
One promising approach is to use real space analysis of colloidal dispersions at the single-particle level to reveal local structural details which are inaccessible to many experimental techniques.  ...  We exploit the difference in sedimentation velocities of colloidal particles of different sizes, leading to a sediment which changes continuously in composition as a function of height, revealing glassy  ...  Acknowledgments Stephen Williams and Willem Kegel are thanked for helpful discussions. We would like to thank Didi Derks and Mirjam Leunissen for particle synthesis.  ... 
doi:10.1088/0953-8984/20/40/404225 fatcat:rbkpahge55apvdp3zsuryyrxwi

Video Microscopy of Colloidal Suspensions and Colloidal Crystals [article]

Piotr Habdas, Eric R. Weeks
2002 arXiv   pre-print
Video microscopy is capable of directly imaging the structure and dynamics of colloidal suspensions in different phases.  ...  Colloidal suspensions are simple model systems for the study of phase transitions.  ...  Acknowledgements We thank Gianguido Cianci, John Crocker, and Dan Young for a careful reading of the manuscript.  ... 
arXiv:cond-mat/0204507v1 fatcat:4yzd26vkxvcphlg4w54zm3jdti

Video microscopy of colloidal suspensions and colloidal crystals

Piotr Habdas, Eric R. Weeks
2002 Current Opinion in Colloid & Interface Science  
Video microscopy is capable of directly imaging the structure and dynamics of colloidal suspensions in different phases.  ...  Colloidal suspensions are simple model systems for the study of phase transitions.  ...  Acknowledgements We thank Gianguido Cianci, John Crocker, and Dan Young for a careful reading of the manuscript.  ... 
doi:10.1016/s1359-0294(02)00049-3 fatcat:3tsbkrynuzch3mtig36hy535bi

Laser diffraction microscopy

P Schall
2009 Reports on progress in physics (Print)  
This review discusses the application of optical diffraction contrast imaging to elucidate colloidal crystal nucleation and growth, and defect propagation.  ...  Phys. 72 (2009) 076601 (34pp) Laser diffraction microscopy P Schall Abstract Crystals composed of micrometer size colloidal particles diffract light and are both of fundamental interest as well as have  ...  Spaepen and Prof. D. Weitz for helpful discussions and feedback on the manuscript. Furthermore, I would like to thank all authors that were willing to allow use of their figures in this review.  ... 
doi:10.1088/0034-4885/72/7/076601 fatcat:2jiopqjdfzbbzmmjzmpraplxyi

Atomic Force Microscopy and Magnetic Force Microscopy Study of Model Colloids

M. Raşa, B.W.M. Kuipers, A.P. Philipse
2002 Journal of Colloid and Interface Science  
Atomic force microscopy (AFM) is used to study the size, shape, and polydispersity of a variety of magnetic and nonmagnetic model colloids, previously imaged by transmission electron microscopy (TEM) only  ...  Both height and phase images are analyzed and special attention is given to 3D morphology and softness of particles, as well as structures and presence of secondary components in the colloid, difficult  ...  ACKNOWLEDGMENTS The following "Van 't Hoff members" kindly provided the colloids: K. Butter  ... 
doi:10.1006/jcis.2002.8345 pmid:16290668 fatcat:4vdxm63ypnfyrgw6ijpcenplla

Experimental determination of order in non-equilibrium solids using colloidal gels

Yongxiang Gao, Maria Kilfoil
2004 Journal of Physics: Condensed Matter  
Here we focus on gels, using as a model system colloidal gels formed from hard spheres with polymer added to the systems to induce a controlled, weak attraction.  ...  To give a clearer physical picture for gels, we compare the experimental data to computer generated hard sphere systems.  ...  We first thank Andrew Schofield and Peter Pusey of University of Edinburgh for providing PMMA latex particles, and Dave Weitz of Harvard University for allowing the use of equipment.  ... 
doi:10.1088/0953-8984/16/44/016 fatcat:dkno26oxs5cw5ia4t7zzfnq6ei

Real-Space Structure of Colloidal Hard-Sphere Glasses

A. van Blaaderen, P. Wiltzius
1995 Science  
We have shown that with confocal microscopy it is possible to study structures of fluorescent colloidal model spheres in real space with high accuracy and with no essential limit to the number of particles  ...  The improved resolution and sectioning capability of fluorescence confocal scanning light microscopy (14-I 6) can bc fully exploited with the LISC of digital image analysis to obtain the coordinates of  ... 
doi:10.1126/science.270.5239.1177 fatcat:h4cvuya4obdgbpgofbzgp22r5m

Tunable attractive and repulsive interactions between pH-responsive microgels

Jae Kyu Cho, Zhiyong Meng, L. Andrew Lyon, Victor Breedveld
2009 Soft Matter  
Ornstein-Zernike analysis of the pair distribution function of quasi-2D dilute colloidal suspensions.  ...  these particles in concentrated suspensions.  ...  LAL acknowledges financial support from the Office of Naval Research, and the ONR DURIP program for this work (N00014-03-1-0225 and N00014-04-1-0488).  ... 
doi:10.1039/b912105f fatcat:iiz57wsmtncljltmiprv65axtm

Rheology of colloidal and metallic glass formers

Thomas Voigtmann, Miriam Siebenbürger, Christian P. Amann, Stefan U. Egelhaaf, Sebastian Fritschi, Matthias Krüger, Marco Laurati, Kevin J. Mutch, Konrad H. Samwer
2020 Colloid and Polymer Science  
Colloidal hard-sphere suspensions are convenient experimental models to understand soft matter, and also by analogy the structural-relaxation behavior of atomic or small-molecular fluids.  ...  Experiments on colloids give access to the microscopic structure under deformation on a single-particle level, providing insight into the yielding mechanisms that are likely also relevant for metallic  ...  image analysis.  ... 
doi:10.1007/s00396-020-04654-z fatcat:ccezwfhm7vct7a5dq7tpacygqq

The measurement of solid–liquid interfacial energy in colloidal suspensions using grain boundary grooves

Richard B. Rogers, Bruce J. Ackerson
2011 Philosophical Magazine  
measurements in both colloidal and atomic/molecular systems.  ...  Image Processing and Data Analysis For each image that was saved for analysis, 16 frames (typical) of video images were digitized and averaged to reduce image noise.  ... 
doi:10.1080/14786435.2010.527306 fatcat:6kltu7bbtvgttepthnmk7qxxe4

Colloidal matter: Packing, geometry, and entropy

V. N. Manoharan
2015 Science  
Abstract Colloidal particles with well-controlled shapes and interactions are an ideal experimental system for exploring how matter organizes itself.  ...  Like atoms and molecules, these particles form bulk phases such as liquids and crystals.  ...  These colloids can form crystals and other phases of matter seen in atomic and molecular systems, but because the particles are large enough to be seen under an optical microscope, the microscopic mechanisms  ... 
doi:10.1126/science.1253751 pmid:26315444 fatcat:rzozl6egw5a7djxf24sv7eu3we
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