1
|
Zavala-Martínez AB, Grelet E. M13-Phage-Based Star-Shaped Particles with Internal Flexibility. ACS NANO 2024; 18:281-287. [PMID: 38113352 DOI: 10.1021/acsnano.3c06134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2023]
Abstract
We report on the construction and the dynamics of monodisperse star-shaped particles, mimicking, at the mesoscale, star polymers. Such multiarm star-like particles result from the self-assembly of gold nanoparticles, forming the core, with tip-linked filamentous viruses (M13 bacteriophages) acting as spines in a sea urchin-like structure. By combining fluorescence and dark-field microscopy with dynamic light scattering, we investigate the diffusion of these hybrid spiny particles. We reveal the internal dynamics of the star particles by probing their central metallic core, which exhibits a hindered motion that can be described as a Brownian particle trapped in a harmonic potential. We therefore show that the filamentous viruses and specifically their tip proteins behave as entropic springs, extending the relevance of the study of such hybrid mesoscopic analogues of star polymers to phage biotechnology.
Collapse
Affiliation(s)
- Arantza B Zavala-Martínez
- Univ. Bordeaux, CNRS, Centre de Recherche Paul-Pascal, UMR 5031,115Avenue du Dr. Schweitzer, F-33600 Pessac, France
| | - Eric Grelet
- Univ. Bordeaux, CNRS, Centre de Recherche Paul-Pascal, UMR 5031,115Avenue du Dr. Schweitzer, F-33600 Pessac, France
| |
Collapse
|
2
|
Anop H, Buitenhuis J. Polyelectrolyte Complexes from Oppositely Charged Filamentous Viruses. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2023; 39:4545-4556. [PMID: 36947868 PMCID: PMC10077591 DOI: 10.1021/acs.langmuir.2c02790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/12/2022] [Revised: 03/09/2023] [Indexed: 06/18/2023]
Abstract
Here, we present an explorative study on a new type of polyelectrolyte complex made from chemically modified filamentous fd viruses. The fd virus is a semiflexible rod-shaped bacteriophage with a length of 880 nm and a diameter of 6.6 nm, which has been widely used as a well-defined model system of colloidal rods to investigate phase, flow, and other behavior. Here, chemically modified viruses have been prepared to obtain two types with opposite electrical charges in addition to a steric stabilization layer by poly(ethylene glycol) (PEG) grafting. The complex formation of stoichiometric mixtures of these oppositely charged viruses is studied as a function of virus and salt concentration. Furthermore, static light scattering measurements show a varying, strong increase in scattering intensity in some samples without visual macroscopic complex formation. Finally, the results of the complex formation are rationalized by comparing to model calculations on the pair interaction potential between oppositely charged viruses.
Collapse
Affiliation(s)
- Hanna Anop
- Forschungszentrum
Jülich, IBI-4, Biomacromolecular Systems and Processes, 52425 Jülich, Germany
- Cordouan
Technologies, Cité
de la Photonique, 11 Avenue Canteranne, 33600 Pessac, France
| | - Johan Buitenhuis
- Forschungszentrum
Jülich, IBI-4, Biomacromolecular Systems and Processes, 52425 Jülich, Germany
| |
Collapse
|
3
|
Zhang Y, Wakabayashi R, Kimura T. Aerosol-assisted synthesis of titania-based spherical and fibrous materials with a rational design of mesopores using PS- b-PEO. Dalton Trans 2023; 52:1543-1550. [PMID: 36533632 DOI: 10.1039/d2dt03402f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
Surfactant-assisted synthesis is a promising technique for the tailor-made design of highly porous metal oxide based nanomaterials. There has been a demand for the comprehensive design of their morphology, porous structure and crystallinity to extend potential applications using metal oxide based materials such as titania (TiO2). However, the porous structure is often deformed and/or destroyed during the process of crystallizing metal oxide frameworks. Herein, the aerosol-assisted synthesis of mesoporous TiO2 powders was conducted in the presence of high-molecular-weight poly(styrene)-block-poly(ethylene oxide) (PS-b-PEO), which improved the stability of the derivative mesoporous structure with an increase in the thickness of the TiO2 frameworks. To propose a rational synthetic route for stable and porous metal oxides, the resultant mesoporous structure and the textural morphology of the mesoporous TiO2 powders were surveyed using PS-b-PEO with different lengths of PS and PEO chains. By a judicious choice of the molecular structure of PS-b-PEO, the morphological design of the fully crystallized anatase phase of TiO2 from spherical to fibrous ones was achieved with control over the mesopore diameter.
Collapse
Affiliation(s)
- Yuxiao Zhang
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Sakurazaka, Moriyama-ku, Nagoya 463-8560, Japan.
| | - Ryutaro Wakabayashi
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Sakurazaka, Moriyama-ku, Nagoya 463-8560, Japan.
| | - Tatsuo Kimura
- Innovative Functional Materials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Sakurazaka, Moriyama-ku, Nagoya 463-8560, Japan.
| |
Collapse
|
4
|
Emiroglu DB, Bekcic A, Dranseikiene D, Zhang X, Zambelli T, deMello AJ, Tibbitt MW. Building block properties govern granular hydrogel mechanics through contact deformations. SCIENCE ADVANCES 2022; 8:eadd8570. [PMID: 36525484 PMCID: PMC9757745 DOI: 10.1126/sciadv.add8570] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2022] [Accepted: 11/16/2022] [Indexed: 06/17/2023]
Abstract
Granular hydrogels have been increasingly exploited in biomedical applications, including wound healing and cardiac repair. Despite their utility, design guidelines for engineering their macroscale properties remain limited, as we do not understand how the properties of granular hydrogels emerge from collective interactions of their microgel building blocks. In this work, we related building block features (stiffness and size) to the macroscale properties of granular hydrogels using contact mechanics. We investigated the mechanics of the microgel packings through dynamic oscillatory rheology. In addition, we modeled the system as a collection of two-body interactions and applied the Zwanzig and Mountain formula to calculate the plateau modulus and viscosity of the granular hydrogels. The calculations agreed with the dynamic mechanical measurements and described how microgel properties and contact deformations define the rheology of granular hydrogels. These results support a rational design framework for improved engineering of this fascinating class of materials.
Collapse
Affiliation(s)
- Dilara Börte Emiroglu
- Macromolecular Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Aleksandar Bekcic
- Macromolecular Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Dalia Dranseikiene
- Macromolecular Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
| | - Xinyu Zhang
- Laboratory of Biosensors and Bioelectronics, Department of Information Technology and Electrical Engineering, ETHZurich, 8093 Zurich, Switzerland
| | - Tomaso Zambelli
- Laboratory of Biosensors and Bioelectronics, Department of Information Technology and Electrical Engineering, ETHZurich, 8093 Zurich, Switzerland
| | - Andrew J. deMello
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, 8093 Zurich, Switzerland
| | - Mark W. Tibbitt
- Macromolecular Engineering Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland
| |
Collapse
|
5
|
Xie R, Mukherjee S, Levi AE, Self JL, Wang H, Chabinyc ML, Bates CM. Yielding Behavior of Bottlebrush and Linear Block Copolymers. Macromolecules 2021. [DOI: 10.1021/acs.macromol.1c00557] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Renxuan Xie
- Mitsubishi Chemical Center for Advanced Materials, University of California, Santa Barbara, California 93106, United States
| | - Sanjoy Mukherjee
- Mitsubishi Chemical Center for Advanced Materials, University of California, Santa Barbara, California 93106, United States
| | - Adam E. Levi
- Department of Chemistry & Biochemistry , University of California, Santa Barbara, California 93106, United States
| | - Jeffrey L. Self
- Department of Chemistry & Biochemistry , University of California, Santa Barbara, California 93106, United States
| | - Hengbin Wang
- Mitsubishi Chemical Center for Advanced Materials, University of California, Santa Barbara, California 93106, United States
| | - Michael L. Chabinyc
- Mitsubishi Chemical Center for Advanced Materials, University of California, Santa Barbara, California 93106, United States
- Materials Department , University of California, Santa Barbara, California 93106, United States
| | - Christopher M. Bates
- Department of Chemistry & Biochemistry , University of California, Santa Barbara, California 93106, United States
- Materials Department , University of California, Santa Barbara, California 93106, United States
- Materials Research Laboratory , University of California, Santa Barbara, California 93106, United States
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| |
Collapse
|
6
|
Foroutani K, Ghasemi SM, Pourabbas B. Molecular tailoring of polystyrene-block-poly (acrylic acid) block copolymer toward additive-free asymmetric isoporous membranes via SNIPS. J Memb Sci 2021. [DOI: 10.1016/j.memsci.2021.119099] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
|
7
|
Polyethyleneoxide‐
b
‐poly(isopropyl methacrylate) diblock copolymers as novel material for ultrafiltration membranes. JOURNAL OF POLYMER SCIENCE 2020. [DOI: 10.1002/pol.20190155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
8
|
Lee HM, Perumal S, Kim GY, Kim JC, Kim YR, Kim MP, Ko H, Rho Y, Cheong IW. Enhanced thermomechanical property of a self-healing polymer via self-assembly of a reversibly cross-linkable block copolymer. Polym Chem 2020. [DOI: 10.1039/d0py00310g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Introduction of a self-healable block copolymer increases the mechanical property whilst maintaining self-healing efficiency.
Collapse
Affiliation(s)
- Hyang Moo Lee
- Department of Applied Chemistry
- Kyungpook National University
- Daegu 41566
- Republic of Korea
| | - Suguna Perumal
- Department of Applied Chemistry
- Kyungpook National University
- Daegu 41566
- Republic of Korea
| | - Gi Young Kim
- Research Center for Green Fine Chemicals
- Korea Research Institute of Chemical Technology
- Ulsan
- Republic of Korea
| | - Jin Chul Kim
- Research Center for Green Fine Chemicals
- Korea Research Institute of Chemical Technology
- Ulsan
- Republic of Korea
| | - Young-Ryul Kim
- School of Energy and Chemical Engineering
- Ulsan National Institute of Science and Technology
- Ulsan 44919
- Korea
| | - Minsoo P. Kim
- School of Energy and Chemical Engineering
- Ulsan National Institute of Science and Technology
- Ulsan 44919
- Korea
| | - Hyunhyup Ko
- School of Energy and Chemical Engineering
- Ulsan National Institute of Science and Technology
- Ulsan 44919
- Korea
| | - Yecheol Rho
- Chemical Analysis Center
- Korea Research Institute of Chemical Technology
- Daejeon 34114
- Korea
| | - In Woo Cheong
- Department of Applied Chemistry
- Kyungpook National University
- Daegu 41566
- Republic of Korea
| |
Collapse
|
9
|
Chen L, Lee HS, Zhernenkov M, Lee S. Martensitic Transformation of Close-Packed Polytypes of Block Copolymer Micelles. Macromolecules 2019. [DOI: 10.1021/acs.macromol.9b00917] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Liwen Chen
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Han Seung Lee
- Characterization Facility, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | - Mikhail Zhernenkov
- National Synchrotron Light Source-II, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Sangwoo Lee
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| |
Collapse
|
10
|
Close-packed block copolymer micelles induced by temperature quenching. Proc Natl Acad Sci U S A 2018; 115:7218-7223. [PMID: 29929964 DOI: 10.1073/pnas.1801682115] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Close-packed structures of uniformly sized spheres are ubiquitous across diverse material systems including elements, micelles, and colloidal assemblies. However, the controlled access to a specific symmetry of self-assembled close-packed spherical particles has not been well established. We investigated the ordering of spherical block copolymer micelles in aqueous solutions that was induced by rapid temperature changes referred to as quenching. As a function of quench depth, the quenched self-assembled block copolymer micelles formed three different close-packed structures: face-centered cubic (fcc), random stacking of hexagonal-close-packed layers (rhcp), and hexagonal-close-packed (hcp). The induced hcp and rhcp structures were stable for at least a few weeks when maintained at their quench temperatures, but heating or cooling these hcp and rhcp structures transformed both structures to fcc crystallites with coarsening of the crystal grains, which suggests that these noncubic close-packed structures are intermediate states. Time-resolved scattering experiments prove that the micellar rhcp structures do not originate from the rapid growth of competing close-packed structures. We speculate that the long-lived metastable hcp and rhcp structures originate from the small size of crystal grains, which introduces a nonnegligible Laplace pressure to the crystal domains. The reported transitions from the less stable hcp to the more stable rhcp and fcc are experimental observations of Ostwald's rule manifesting the transition order of the key close-packed structures in the crystallization of close-packed uniform spheres.
Collapse
|
11
|
Nelson AZ, Ewoldt RH. Design of yield-stress fluids: a rheology-to-structure inverse problem. SOFT MATTER 2017; 13:7578-7594. [PMID: 28972605 DOI: 10.1039/c7sm00758b] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We present a paradigm for the design of yield-stress fluids, using six archetypal materials for demonstration. By applying concepts of engineering design, we outline a materials design paradigm that includes (i) morphological organization based on jammed versus networked microstructures, (ii) collected scaling laws for predictive design, (iii) low-dimensional descriptions of function-valued flow data, (iv) consideration of secondary properties including viscous behavior, and (v) a strategy for material concept synthesis based on the juxtaposition of microstructures. By explicitly specifying these design strategies, we seek to create an ontology and database for the engineering of yield-stress fluids. Our proposed design strategy increases the likelihood of finding an optimal material and prevents design fixation by considering multiple material classes to achieve a desired rheological performance. This flips the typical structure-to-rheology analysis to become the inverse: rheology-to-structure with multiple possible materials as solutions.
Collapse
Affiliation(s)
- Arif Z Nelson
- Department of Mechanical Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA.
| | | |
Collapse
|
12
|
Gkermpoura S, Obiols-Rabasa M, Iatridi Z, Tsitsilianis C. Thermo-Resistant Soft Glassy Suspensions of Polymeric Micellar Nanoparticles in Ionic Liquid. ACS APPLIED MATERIALS & INTERFACES 2015; 7:12411-12421. [PMID: 25634906 DOI: 10.1021/am507587s] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the rheological and structural properties of a suspension comprising poly(ethylene oxide)-polystyrene-poly(ethylene oxide) core-shell micellar nanoparticles dispersed in 1-butyl-3-methylimidazolium hexafluorophosphate ionic liquid. A liquid to soft solid transition was observed at a copolymer concentration of 10 wt % above which an elastic soft material was formed, which was composed of non-ordered jammed core-shell micellar nanoparticles. In the soft solid state, a significant reduction in the size of the nanoparticles, approaching hard sphere behavior, was observed by small-angle X-ray scattering which is attributed to compression of the soft poly(ethylene oxide) coronas. The nonvolatile ionic liquid-based glassy soft solid formed exhibited remarkable thermal stability with a melting temperature of 141 °C at 20 wt % copolymer, which renders it suitable for applications involving elevated temperatures and/or reduced pressure where water-based formulations are inappropriate.
Collapse
Affiliation(s)
- Sandra Gkermpoura
- †Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
| | - Marc Obiols-Rabasa
- ‡Division of Physical Chemistry, Department of Chemistry, Lund University, SE-221 00 Lund, Sweden
| | - Zacharoula Iatridi
- †Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
| | - Constantinos Tsitsilianis
- †Department of Chemical Engineering, University of Patras, 26504 Patras, Greece
- §Institute of Chemical Engineering Sciences (ICEHT/FORTH), 26504 Patras, Greece
| |
Collapse
|
13
|
Zhang J, Lettinga PM, Dhont JKG, Stiakakis E. Direct visualization of conformation and dense packing of DNA-based soft colloids. PHYSICAL REVIEW LETTERS 2014; 113:268303. [PMID: 25615395 DOI: 10.1103/physrevlett.113.268303] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2014] [Indexed: 05/23/2023]
Abstract
Soft colloids--such as polymer-coated particles, star polymers, block-copolymer micelles, microgels--constitute a broad class of materials where microscopic properties such as deformability and penetrability of the particle play a key role in tailoring their macroscopic properties which is of interest in many technological areas. The ability to access these microscopic properties is not yet demonstrated despite its great importance. Here we introduce novel DNA-coated colloids with star-shaped architecture that allows accessing the above local structural information by directly visualizing their intramolecular monomer density profile and arm's free-end locations with confocal fluorescent microscopy. Compression experiments on a two-dimensional hexagonal lattice formed by these macromolecular assemblies reveal an exceptional resistance to mutual interpenetration of their charged corona at pressures approaching the MPa range. Furthermore, we find that this lattice, in a close packing configuration, is surprisingly tolerant to particle size variation. We anticipate that these stimuli-responsive materials could aid to get deeper insight in a wide range of problems in soft matter, including the study and design of biomimetic lubricated surfaces.
Collapse
Affiliation(s)
- Jing Zhang
- Forschungszentrum Jülich, Institute of Complex Systems 3, Leo-Brandt-Straße, 52425 Jülich, Germany
| | - Paul M Lettinga
- Forschungszentrum Jülich, Institute of Complex Systems 3, Leo-Brandt-Straße, 52425 Jülich, Germany and Department of Physics and Astronomy, Laboratory for Acoustics and Thermal Physics, Katholieke Universiteit Leuven, Celestijnenlaan 200D, Leuven B-3001, Belgium
| | - Jan K G Dhont
- Forschungszentrum Jülich, Institute of Complex Systems 3, Leo-Brandt-Straße, 52425 Jülich, Germany and Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, 40225 Düsseldorf, Germany
| | - Emmanuel Stiakakis
- Forschungszentrum Jülich, Institute of Complex Systems 3, Leo-Brandt-Straße, 52425 Jülich, Germany
| |
Collapse
|
14
|
|
15
|
Sadati M, Nourhani A, Fredberg JJ, Qazvini NT. Glass-like dynamics in the cell and in cellular collectives. WILEY INTERDISCIPLINARY REVIEWS. SYSTEMS BIOLOGY AND MEDICINE 2014; 6:137-49. [PMID: 24431332 PMCID: PMC4000035 DOI: 10.1002/wsbm.1258] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Revised: 10/21/2013] [Accepted: 12/02/2013] [Indexed: 01/19/2023]
Abstract
Prominent fluctuations, heterogeneity, and cooperativity dominate the dynamics of the cytoskeleton as well as the dynamics of the cellular collective. Such systems are out of equilibrium, disordered, and remain poorly understood. To explain these findings, we consider a unifying mechanistic rubric that imagines these systems as comprising phases of soft condensed matter in proximity to a glass or jamming transition, with associated transitions between solid-like versus liquid-like phases. At the scale of the cytoskeleton, data suggest that intermittent dynamics, kinetic arrest, and dynamic heterogeneity represent mesoscale features of glassy protein-protein interactions that link underlying biochemical events to integrative cellular behaviors such as crawling, contraction, and remodeling. At the scale of the multicellular collective, jamming has the potential to unify diverse biological factors that previously had been considered mostly as acting separately and independently. Although a quantitative relationship between intra- and intercellular dynamics is still lacking, glassy dynamics and jamming offer insights linking the mechanobiology of cell to human physiology and pathophysiology.
Collapse
Affiliation(s)
- Monirosadat Sadati
- School of Public Health, Harvard University, Boston, MA 02115, United States
| | - Amir Nourhani
- Department of Physics, The Pennsylvania State University, University Park, PA 16802, United States
| | - Jeffrey J. Fredberg
- School of Public Health, Harvard University, Boston, MA 02115, United States
| | - Nader Taheri Qazvini
- School of Public Health, Harvard University, Boston, MA 02115, United States, School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| |
Collapse
|
16
|
Karunakaran M, Nunes SP, Qiu X, Yu H, Peinemann KV. Isoporous PS-b-PEO ultrafiltration membranes via self-assembly and water-induced phase separation. J Memb Sci 2014. [DOI: 10.1016/j.memsci.2013.11.015] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
17
|
Exner A, Rosenfeldt S, Fischer S, Lindner P, Förster S. Defect accommodation in nanostructured soft crystals. NANOSCALE 2014; 6:1635-1645. [PMID: 24336833 DOI: 10.1039/c3nr05124b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A detailed analysis of the structure of lyotropic micellar FCC soft crystals was performed by scanning small-angle neutron scattering. Soft crystals have a large number of structural defects, leading to characteristic features in the scattering patterns such as secondary Bragg peaks, diffuse scattering lines, and paracrystalline distortions. We find that the presence of a large number of defects locally breaks the three-dimensional symmetry of the crystal, leading to weakly correlated assemblies of stacked {111} layers. Positional correlations of micelles in different layers are very short ranged, with correlation lengths corresponding to only a few layers. Within the layers, in-plane positional correlations are somewhat longer ranged, but still corresponding to only a few unit cells. Depending on the polydispersity, soft crystals accommodate defects to form mesocrystals of iso-oriented mosaic domains, or paracrystals. The soft layer structures already show characteristic features of two-dimensional systems, exhibiting short-range positional order and longer-ranged orientational order, with similarities to hexatic and recently observed soft quasicrystalline structures. The study shows that defects can be differently accommodated in soft crystals, thereby strongly affecting local and macroscopic positional and orientational order.
Collapse
Affiliation(s)
- Alexander Exner
- Physical Chemistry I, University of Bayreuth, D-95440 Bayreuth, Germany.
| | | | | | | | | |
Collapse
|
18
|
Madhavan P, Peinemann KV, Nunes SP. Complexation-tailored morphology of asymmetric block copolymer membranes. ACS APPLIED MATERIALS & INTERFACES 2013; 5:7152-7159. [PMID: 23815587 DOI: 10.1021/am401497m] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Hydrogen-bond formation between polystyrene-b-poly (4-vinylpyridine) (PS-b-P4VP) block copolymer (BCP) and -OH/-COOH functionalized organic molecules was used to tune morphology of asymmetric nanoporous membranes prepared by simultaneous self-assembly and nonsolvent induced phase separation. The morphologies were characterized by field emmision scanning electron microscopy (FESEM) and atomic force microscopy (AFM). Hydrogen bonds were confirmed by infrared (IR), and the results were correlated to rheology characterization. The OH-functionalized organic molecules direct the morphology into hexagonal order. COOH-functionalized molecules led to both lamellar and hexagonal structures. Micelle formation in solutions and their sizes were determined using dynamic light scattering (DLS) measurements and water fluxes of 600-3200 L/m(2)·h·bar were obtained. The pore size of the plain BCP membrane was smaller than with additives. The following series of additives led to pores with hexagonal order with increasing pore size: terephthalic acid (COOH-bifunctionalized) < rutin (OH-multifunctionalized) < 9-anthracenemethanol (OH-monofunctionalized) < 3,5-dihydroxybenzyl alcohol (OH-trifunctionalized).
Collapse
Affiliation(s)
- Poornima Madhavan
- Water Desalination and Reuse Center, King Abdullah University of Science and Technology, 23955-6900 Thuwal, Saudi Arabia
| | | | | |
Collapse
|
19
|
|
20
|
Yu Y, Anthony SM, Bae SC, Granick S. How Liposomes Diffuse in Concentrated Liposome Suspensions. J Phys Chem B 2011; 115:2748-53. [DOI: 10.1021/jp109146s] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Yan Yu
- Departments of †Materials Science and Engineering, ‡Chemistry, and §Physics, University of Illinois, Urbana, Illinois 61801, United States
| | - Stephen M. Anthony
- Departments of †Materials Science and Engineering, ‡Chemistry, and §Physics, University of Illinois, Urbana, Illinois 61801, United States
| | - Sung Chul Bae
- Departments of †Materials Science and Engineering, ‡Chemistry, and §Physics, University of Illinois, Urbana, Illinois 61801, United States
| | - Steve Granick
- Departments of †Materials Science and Engineering, ‡Chemistry, and §Physics, University of Illinois, Urbana, Illinois 61801, United States
| |
Collapse
|
21
|
Ho RM, Chiang YW, Lin SC, Chen CK. Helical architectures from self-assembly of chiral polymers and block copolymers. Prog Polym Sci 2011. [DOI: 10.1016/j.progpolymsci.2010.09.001] [Citation(s) in RCA: 127] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
22
|
|
23
|
El-Atwani O, Aytun T, Mutaf OF, Srot V, van Aken PA, Ow-Yang CW. Determining the morphology of polystyrene-block-poly(2-vinylpyridine) micellar reactors for ZnO nanoparticle synthesis. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:7431-7436. [PMID: 20085372 DOI: 10.1021/la904143f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We report the use of reverse PS-b-P2VP diblock copolymer micelles as true nanoscale-sized reactor vessels to synthesize ZnO nanoparticles. The reverse micelles were formed in toluene and then sequentially loaded with zinc acetate dihydrate and tetramethylammonium hydroxide reactants. Moreover, high spatial resolution Z-contrast imaging and EDX spectroscopy techniques were used to confirm the segregation of the Zn cation to the core of the loaded micelles. Determining the chemical distribution with high nanoscale spatial resolution is shown to complement the less direct characterization by AFM, DLS and FTIR, thus demonstrating broader implications for the characterization of hybrid nanocomposite systems.
Collapse
Affiliation(s)
- Osman El-Atwani
- Materials Science and Engineering Program, Sabanci University, Orhanli, Tuzla, 34956 Istanbul, Turkey
| | | | | | | | | | | |
Collapse
|
24
|
Christopoulou C, Petekidis G, Erwin B, Cloitre M, Vlassopoulos D. Ageing and yield behaviour in model soft colloidal glasses. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2009; 367:5051-5071. [PMID: 19933127 DOI: 10.1098/rsta.2009.0166] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We use multi-arm star polymers as model soft colloids with tuneable interactions and explore their behaviour in the glassy state. In particular, we perform a systematic rheological study with a well-defined protocol and address aspects of ageing and shear melting of star glasses. Ageing proceeds in two distinct steps: a fast step of O(10(3) s) and a slow step of O(10(4) s). We focus on creep and recovery tests, which reveal a rich, albeit complex response. Although the waiting time, the time between pre-shear (rejuvenation) of the glassy sample and measurement, affects the material's response, it does not play the same role as in other soft glasses. For stresses below the yield value, the creep curve is divided into three regimes with increasing time: viscoplastic, intermediate steady flow (associated with the first ageing step) and long-time evolving elastic solid. This behaviour reflects the interplay between ageing and shear rejuvenation. The yield behaviour, as investigated with the stress-dependent recoverable strain, indicates a highly nonlinear elastic response intermediate between a low-stress Hookean solid and a high-stress viscoelastic liquid, and exemplifies the distinct characteristics of this class of hairy colloids. It appears that a phenomenological classification of different colloidal glasses based on yielding performance may be possible.
Collapse
Affiliation(s)
- C Christopoulou
- Foundation for Research and Technology Hellas, Institute of Electronic Structure and Laser, Road to Voutes, Crete, Greece
| | | | | | | | | |
Collapse
|
25
|
Abstract
Glass formation in colloidal suspensions has many of the hallmarks of glass formation in molecular materials. For hard-sphere colloids, which interact only as a result of excluded volume, phase behaviour is controlled by volume fraction, phi; an increase in phi drives the system towards its glassy state, analogously to a decrease in temperature, T, in molecular systems. When phi increases above phi* approximately 0.53, the viscosity starts to increase significantly, and the system eventually moves out of equilibrium at the glass transition, phi(g) approximately 0.58, where particle crowding greatly restricts structural relaxation. The large particle size makes it possible to study both structure and dynamics with light scattering and imaging; colloidal suspensions have therefore provided considerable insight into the glass transition. However, hard-sphere colloidal suspensions do not exhibit the same diversity of behaviour as molecular glasses. This is highlighted by the wide variation in behaviour observed for the viscosity or structural relaxation time, tau(alpha), when the glassy state is approached in supercooled molecular liquids. This variation is characterized by the unifying concept of fragility, which has spurred the search for a 'universal' description of dynamic arrest in glass-forming liquids. For 'fragile' liquids, tau(alpha) is highly sensitive to changes in T, whereas non-fragile, or 'strong', liquids show a much lower T sensitivity. In contrast, hard-sphere colloidal suspensions are restricted to fragile behaviour, as determined by their phi dependence, ultimately limiting their utility in the study of the glass transition. Here we show that deformable colloidal particles, when studied through their concentration dependence at fixed temperature, do exhibit the same variation in fragility as that observed in the T dependence of molecular liquids at fixed volume. Their fragility is dictated by elastic properties on the scale of individual colloidal particles. Furthermore, we find an equivalent effect in molecular systems, where elasticity directly reflects fragility. Colloidal suspensions may thus provide new insight into glass formation in molecular systems.
Collapse
|
26
|
Universal behavior of the osmotically compressed cell and its analogy to the colloidal glass transition. Proc Natl Acad Sci U S A 2009; 106:10632-7. [PMID: 19520830 DOI: 10.1073/pnas.0901462106] [Citation(s) in RCA: 164] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Mechanical robustness of the cell under different modes of stress and deformation is essential to its survival and function. Under tension, mechanical rigidity is provided by the cytoskeletal network; with increasing stress, this network stiffens, providing increased resistance to deformation. However, a cell must also resist compression, which will inevitably occur whenever cell volume is decreased during such biologically important processes as anhydrobiosis and apoptosis. Under compression, individual filaments can buckle, thereby reducing the stiffness and weakening the cytoskeletal network. However, the intracellular space is crowded with macromolecules and organelles that can resist compression. A simple picture describing their behavior is that of colloidal particles; colloids exhibit a sharp increase in viscosity with increasing volume fraction, ultimately undergoing a glass transition and becoming a solid. We investigate the consequences of these 2 competing effects and show that as a cell is compressed by hyperosmotic stress it becomes progressively more rigid. Although this stiffening behavior depends somewhat on cell type, starting conditions, molecular motors, and cytoskeletal contributions, its dependence on solid volume fraction is exponential in every instance. This universal behavior suggests that compression-induced weakening of the network is overwhelmed by crowding-induced stiffening of the cytoplasm. We also show that compression dramatically slows intracellular relaxation processes. The increase in stiffness, combined with the slowing of relaxation processes, is reminiscent of a glass transition of colloidal suspensions, but only when comprised of deformable particles. Our work provides a means to probe the physical nature of the cytoplasm under compression, and leads to results that are universal across cell type.
Collapse
|
27
|
Aytun T, Mutaf OF, el-Atwani OJ, Ow-Yang CW. Nanoscale composition mapping of segregation in micelles with tapping-mode atomic force microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:14183-14187. [PMID: 19053651 DOI: 10.1021/la802384x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Under energy-dissipative cantilevered tip-sample interaction, phase imaging using tapping-mode atomic force microscopy enables compositional mapping of composites containing a harder inorganic phase at the nanometer scale, embedded in a polymer matrix. The contrast in the phase images is shown to be dependent on the variation in the elastic properties of the diblock copolymer reverse micelles loaded with zinc acetate. Tapping conditions are also shown to determine whether the contrast is positive or negative for the harder core of the loaded micelles, based on the competition between attractive and repulsive tip-sample interaction forces. The broader implications are significant for scanning probe microscopy of other soft materials systems containing the segregation of a harder phase.
Collapse
Affiliation(s)
- Taner Aytun
- Materials Science and Engineering Program, Faculty of Engineering & Natural Sciences, Sabanci University, Orhanli, Tuzla-Istanbul, 34956, Turkey
| | | | | | | |
Collapse
|
28
|
Alexander-Katz A, Netz RR. Dynamics and Instabilities of Collapsed Polymers in Shear Flow. Macromolecules 2008. [DOI: 10.1021/ma702331d] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- A. Alexander-Katz
- Physics Department, Technical University Munich, 85748 Garching, Germany, and Matiere Molle et Chimie, ESPCI, CNRS, UMR 7167, 10 rue Vauquelin, 75005 Paris, France
| | - R. R. Netz
- Physics Department, Technical University Munich, 85748 Garching, Germany, and Matiere Molle et Chimie, ESPCI, CNRS, UMR 7167, 10 rue Vauquelin, 75005 Paris, France
| |
Collapse
|
29
|
Förster S, Timmann A, Schellbach C, Frömsdorf A, Kornowski A, Weller H, Roth SV, Lindner P. Order causes secondary Bragg peaks in soft materials. NATURE MATERIALS 2007; 6:888-93. [PMID: 17721538 DOI: 10.1038/nmat1995] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2007] [Accepted: 07/30/2007] [Indexed: 05/16/2023]
Abstract
Highly ordered soft materials exhibit Bragg peaks that cannot be indexed assuming homogeneous crystal structures. Their origin has been attributed to changes in the crystal structure that are induced by the ordering process such as by application of external fields. This would restrict the use for the generation of highly ordered nano- and microstructured materials where a homogeneous crystal structure is a key requirement. Here, we demonstrate that these Bragg peaks are an inherent property of homogeneous ordered soft materials related to the finite coherence of their crystalline lattice. Their consideration allows a detailed and quantitative analysis of the diffraction patterns of seemingly unrelated materials such as lyotropic liquid-crystalline phases, mesoporous materials, colloidal dispersions, block copolymers, electrorheological fluids and photonic crystals. It further enables us to develop a concise picture of order, line density, field-induced orientation and epitaxial relations for soft-material lattices.
Collapse
Affiliation(s)
- Stephan Förster
- Institute of Physical Chemistry, University of Hamburg, Grindelallee 117, D-20146 Hamburg, Germany.
| | | | | | | | | | | | | | | |
Collapse
|
30
|
Cass MJ, Heyes DM, English RJ. Brownian dynamics simulations of associating diblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:6576-87. [PMID: 17497899 DOI: 10.1021/la063210j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
A novel coarse-grained computational model for associating polymers is proposed that is based on a Gaussian "blob" representation of the polymer chains. The model allows a large number of model polymers to be simulated at moderate computational cost over a wide packing fraction range using the Brownian dynamics, BD, technique. The attraction of the hydrophobic part of the polymer to those on other molecules can lead to strong aggregation of the polymer molecules in real systems, and this is included in the model by an attractive potential felt by the Gaussian blobs to a common "nodal" point that represents the center of the micelle. Attention here is confined to model AB diblock copolymers in which the hydrophilic block, A, has a much higher mass than the hydrophobic moiety, B, which leads to relatively small aggregation numbers, Nagg, of approximately 8. The aggregation number at low packing fractions is found to increase with packing fraction, as observed in experiments, with a functional form that closely follows a simple theory derived here that is based on entropy-derived mean-field terms for the free-energy change associated with the incorporation of the polymer molecule into the micelle. The computational model exhibits an extremely low critical micelle concentration (cmc), and micelles with Nagg approximately 5 are observed at the lowest packing fractions, phi, simulated ( approximately 10-4), which is consistent with experiment. The long-time self-diffusion coefficient of the polymers (and hence micelles) decreases logarithmically with packing fraction, and the viscosity increased with concentration according to the Huggins equation. The spherical blob coarse graining results in the simulable time scales being longer than the Rouse time of the chain, and hence for the nonassociating polymers the intrinsic viscosity is an input parameter in the model. The introduction of association leads to the partial inclusion of the intrinsic viscosity in the simulation and has an effect on the computed Huggins coefficient, kH, which is found to be approximately 6 in those cases.
Collapse
Affiliation(s)
- M J Cass
- Division of Chemistry, School of Biomedical and Molecular Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom
| | | | | |
Collapse
|
31
|
Renou F, Benyahia L, Nicolai T. Influence of Adding Unfunctionalized PEO on the Viscoelasticity and the Structure of Dense Polymeric Micelle Solutions Formed by Hydrophobically End-Capped PEO. Macromolecules 2007. [DOI: 10.1021/ma070263e] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Frédéric Renou
- Polymères, colloïdes, Interfaces, UMR CNRS 6120, Université du Maine, 72085 Le Mans Cedex 9, France
| | - Lazhar Benyahia
- Polymères, colloïdes, Interfaces, UMR CNRS 6120, Université du Maine, 72085 Le Mans Cedex 9, France
| | - Taco Nicolai
- Polymères, colloïdes, Interfaces, UMR CNRS 6120, Université du Maine, 72085 Le Mans Cedex 9, France
| |
Collapse
|
32
|
Modifying the rheological behavior of associative triblock copolymers in aqueous media through surfactant additives. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.05.078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
33
|
|
34
|
Kelarakis A, Crassous JJ, Ballauff M, Yang Z, Booth C. Micellar spheres in a high frequency oscillatory field. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:6814-7. [PMID: 16863225 DOI: 10.1021/la0607860] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The viscoelasticity of aqueous micellar solutions of two oxyethylene/oxybutylene block copolymers (E(92)B(18) and B(20)E(510)) has been investigated using a torsional resonator operated at 26 kHz. For both systems considered, values of the dynamic viscosity (eta'(infinity)) point to partial draining of the micellar corona induced by the high-frequency oscillatory field. At low effective volume fractions, values of the elastic modulus (G'(infinity)) indicate that the repulsive interactions between micelles can be modeled by a power law function u(r) proportional to 1/r(nu) with exponents close to 13 and 6 for copolymers E(92)B(18) and B(20)E(510) respectively. At a critical copolymer concentration (c*) plots of log(G'(infinity)) against log(c) deviate from the straight lines established at low concentrations, implying that the systems undergo ergodic/nonergodic transitions.
Collapse
Affiliation(s)
- Antonis Kelarakis
- Physikalishe Chemie I, Universität Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany.
| | | | | | | | | |
Collapse
|
35
|
Ozon F, Petekidis G, Vlassopoulos D. Signatures of Nonergodicity Transition in a Soft Colloidal System. Ind Eng Chem Res 2006. [DOI: 10.1021/ie051373h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Florian Ozon
- Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas (FO.R.T.H.), Heraklion, Crete, Greece, and Department of Materials Science and Technology, University of Crete, Heraklion, Crete, Greece
| | - George Petekidis
- Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas (FO.R.T.H.), Heraklion, Crete, Greece, and Department of Materials Science and Technology, University of Crete, Heraklion, Crete, Greece
| | - Dimitris Vlassopoulos
- Institute of Electronic Structure and Laser, Foundation for Research and Technology Hellas (FO.R.T.H.), Heraklion, Crete, Greece, and Department of Materials Science and Technology, University of Crete, Heraklion, Crete, Greece
| |
Collapse
|
36
|
Nicolai T, Benyahia L. Shear Flow and Large Strain Oscillation of Dense Polymeric Micelle Suspension. Macromolecules 2005. [DOI: 10.1021/ma0514267] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Taco Nicolai
- Polymères, Colloïdes, Interfaces, UMR CNRS, Université du Maine, 72085 Le Mans Cedex 9, France
| | - Lazhar Benyahia
- Polymères, Colloïdes, Interfaces, UMR CNRS, Université du Maine, 72085 Le Mans Cedex 9, France
| |
Collapse
|
37
|
Lo Verso F, Reatto L, Foffi G, Tartaglia P, Dawson KA. Star polymers: a study of the structural arrest in the presence of attractive interactions. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2004; 70:061409. [PMID: 15697364 DOI: 10.1103/physreve.70.061409] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2004] [Indexed: 05/24/2023]
Abstract
Simulations and mode-coupling theory calculations, for a large range of the arm number f and packing fraction eta have shown that the structural arrest and the dynamics of star polymers in a good solvent are extremely rich: the systems show a reentrant melting of the disordered glass nested between two stable fluid phases that strongly resemble the equilibrium phase diagram. Starting from a simple model potential we investigate the effect of the interplay between attractive interactions of different range and ultrasoft core repulsion, on the dynamics and on the occurrence of the ideal glass transition line. In the two cases considered so far, we observed some significant differences with respect to the purely repulsive pair interaction. We also discuss the interplay between equilibrium and nonequilibrium phase behavior. The accuracy of the theoretical tools we utilized in our investigation has been checked by comparing the results with molecular dynamics simulations.
Collapse
Affiliation(s)
- F Lo Verso
- Istituto Nazionale di Fisica della Materia and Dipartimento di Fisica, Università di Milano, Via Celoria 16, I-20133 Milano, Italy.
| | | | | | | | | |
Collapse
|
38
|
Nicolai T, Laflèche F, Gibaud A. Jamming and Crystallization of Polymeric Micelles. Macromolecules 2004. [DOI: 10.1021/ma049101y] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Taco Nicolai
- Polymères, Colloïdes, Interfaces, UMR CNRS, Université du Maine, 72085 Le Mans Cedex 9, France
| | - Fabrice Laflèche
- Polymères, Colloïdes, Interfaces, UMR CNRS, Université du Maine, 72085 Le Mans Cedex 9, France
| | - Alain Gibaud
- Laboratoire de Physique de l'Etat Condensé, UMR CNRS, Université du Maine, 72085 Le Mans Cedex 9, France
| |
Collapse
|
39
|
Breedveld V, Nowak AP, Sato J, Deming TJ, Pine DJ. Rheology of Block Copolypeptide Solutions: Hydrogels with Tunable Properties. Macromolecules 2004. [DOI: 10.1021/ma049885f] [Citation(s) in RCA: 167] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Victor Breedveld
- Materials Research Laboratory, Department of Chemical Engineering, and Departments of Materials and Chemistry, University of California, Santa Barbara, California 93106 and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Andrew P. Nowak
- Materials Research Laboratory, Department of Chemical Engineering, and Departments of Materials and Chemistry, University of California, Santa Barbara, California 93106 and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Jun Sato
- Materials Research Laboratory, Department of Chemical Engineering, and Departments of Materials and Chemistry, University of California, Santa Barbara, California 93106 and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Timothy J. Deming
- Materials Research Laboratory, Department of Chemical Engineering, and Departments of Materials and Chemistry, University of California, Santa Barbara, California 93106 and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - David J. Pine
- Materials Research Laboratory, Department of Chemical Engineering, and Departments of Materials and Chemistry, University of California, Santa Barbara, California 93106 and School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332
| |
Collapse
|
40
|
Liu Z, Chattopadhyay S, Shaw MT, Hsiao BS. Anomalous rheology in a nanostructured diblock copolymer/hydrocarbon system and its kinetic origin. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/polb.20022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
41
|
Asteriadi A, Sigel R, Vlassopoulos D, Meier G, Dorgan JR, Knauss DM. Molecular Control of the Viscosity of Model Dendritically Branched Polystyrene Solutions: From Polymeric to Colloidal Behavior. Macromolecules 2004. [DOI: 10.1021/ma0355150] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anthi Asteriadi
- FORTH, Institute of Electronic Structure and Laser, Heraklion 71110, Crete, Greece, Max-Planck Institut fuer Kolloid und Grenzflaechenforschung, 14476 Golm, Germany, Department of Materials Science and Technology, University of Crete, Heraklion 71110, Crete, Greece, Institut fuer Festkoerperforschung, Forschungszentrum Juelich, Juelich 52425, Germany, Chemical Engineering Department, Colorado School of Mines, Golden, Colorado 80401, and Chemistry Department, Colorado School of Mines, Golden, Colorado 80401
| | - Reinhard Sigel
- FORTH, Institute of Electronic Structure and Laser, Heraklion 71110, Crete, Greece, Max-Planck Institut fuer Kolloid und Grenzflaechenforschung, 14476 Golm, Germany, Department of Materials Science and Technology, University of Crete, Heraklion 71110, Crete, Greece, Institut fuer Festkoerperforschung, Forschungszentrum Juelich, Juelich 52425, Germany, Chemical Engineering Department, Colorado School of Mines, Golden, Colorado 80401, and Chemistry Department, Colorado School of Mines, Golden, Colorado 80401
| | - Dimitris Vlassopoulos
- FORTH, Institute of Electronic Structure and Laser, Heraklion 71110, Crete, Greece, Max-Planck Institut fuer Kolloid und Grenzflaechenforschung, 14476 Golm, Germany, Department of Materials Science and Technology, University of Crete, Heraklion 71110, Crete, Greece, Institut fuer Festkoerperforschung, Forschungszentrum Juelich, Juelich 52425, Germany, Chemical Engineering Department, Colorado School of Mines, Golden, Colorado 80401, and Chemistry Department, Colorado School of Mines, Golden, Colorado 80401
| | - Gerd Meier
- FORTH, Institute of Electronic Structure and Laser, Heraklion 71110, Crete, Greece, Max-Planck Institut fuer Kolloid und Grenzflaechenforschung, 14476 Golm, Germany, Department of Materials Science and Technology, University of Crete, Heraklion 71110, Crete, Greece, Institut fuer Festkoerperforschung, Forschungszentrum Juelich, Juelich 52425, Germany, Chemical Engineering Department, Colorado School of Mines, Golden, Colorado 80401, and Chemistry Department, Colorado School of Mines, Golden, Colorado 80401
| | - John R. Dorgan
- FORTH, Institute of Electronic Structure and Laser, Heraklion 71110, Crete, Greece, Max-Planck Institut fuer Kolloid und Grenzflaechenforschung, 14476 Golm, Germany, Department of Materials Science and Technology, University of Crete, Heraklion 71110, Crete, Greece, Institut fuer Festkoerperforschung, Forschungszentrum Juelich, Juelich 52425, Germany, Chemical Engineering Department, Colorado School of Mines, Golden, Colorado 80401, and Chemistry Department, Colorado School of Mines, Golden, Colorado 80401
| | - Daniel M. Knauss
- FORTH, Institute of Electronic Structure and Laser, Heraklion 71110, Crete, Greece, Max-Planck Institut fuer Kolloid und Grenzflaechenforschung, 14476 Golm, Germany, Department of Materials Science and Technology, University of Crete, Heraklion 71110, Crete, Greece, Institut fuer Festkoerperforschung, Forschungszentrum Juelich, Juelich 52425, Germany, Chemical Engineering Department, Colorado School of Mines, Golden, Colorado 80401, and Chemistry Department, Colorado School of Mines, Golden, Colorado 80401
| |
Collapse
|
42
|
Vlassopoulos D. Colloidal star polymers: Models for studying dynamically arrested states in soft matter. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/polb.20152] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
43
|
Stiakakis E, Vlassopoulos D, Loppinet B, Roovers J, Meier G. Kinetic arrest of crowded soft spheres in solvents of varying quality. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2002; 66:051804. [PMID: 12513513 DOI: 10.1103/physreve.66.051804] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2002] [Indexed: 05/24/2023]
Abstract
Crowded solutions of multiarm star polymers, representing model colloidal spheres with ultrasoft repulsive interactions, undergo a reversible gelation transition upon heating in solvents of intermediate quality (between good and Theta). This unusual phenomenon is due to the kinetic arrest of the swollen interpenetrating spheres at high temperatures, forming clusters, in analogy to the colloidal glass transition. In this work we demonstrate that the choice of the solvent has a dramatic effect on the gelation transition, because of the different degree of star swelling (at the same temperature) associated with the solvent quality. We construct a generic kinetic phase diagram for the gelation of different stars in different solvents (gelation temperature against effective volume fraction, phi) and propose a critical "soft sphere close packing" volume fraction phi(c) distinguishing the temperature-induced (for phi<phi(c)) from the concentration-induced (for phi>phi(c)) glass-like gelation. We conclude that appropriate selection of the solvent allows for manipulation of the sol-gel transition in such ultrasoft colloids.
Collapse
Affiliation(s)
- E Stiakakis
- FORTH, Institute of Electronic Structure and Laser, GR-71110 Heraklion, Crete, Greece
| | | | | | | | | |
Collapse
|
44
|
Nowak AP, Breedveld V, Pakstis L, Ozbas B, Pine DJ, Pochan D, Deming TJ. Rapidly recovering hydrogel scaffolds from self-assembling diblock copolypeptide amphiphiles. Nature 2002; 417:424-8. [PMID: 12024209 DOI: 10.1038/417424a] [Citation(s) in RCA: 550] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Protein-based hydrogels are used for many applications, ranging from food and cosmetic thickeners to support matrices for drug delivery and tissue replacement. These materials are usually prepared using proteins extracted from natural sources, which can give rise to inconsistent properties unsuitable for medical applications. Recent developments have utilized recombinant DNA methods to prepare artificial protein hydrogels with specific association mechanisms and responsiveness to various stimuli. Here we synthesize diblock copolypeptide amphiphiles containing charged and hydrophobic segments. Dilute solutions of these copolypeptides would be expected to form micelles; instead, they form hydrogels that retain their mechanical strength up to temperatures of about 90 degrees C and recover rapidly after stress. The use of synthetic materials permits adjustment of copolymer chain length and composition, which we varied to study their effect on hydrogel formation and properties. We find that gelation depends not only on the amphiphilic nature of the polypeptides, but also on chain conformations--alpha-helix, beta-strand or random coil. Indeed, shape-specific supramolecular assembly is integral to the gelation process, and provides a new class of peptide-based hydrogels with potential for applications in biotechnology.
Collapse
Affiliation(s)
- Andrew P Nowak
- Department of Materials, University of California, Santa Barbara, California 93106, USA
| | | | | | | | | | | | | |
Collapse
|
45
|
Sebastian JM, Lai C, Graessley WW, Register RA. Steady-Shear Rheology of Block Copolymer Melts and Concentrated Solutions: Disordering Stress in Body-Centered-Cubic Systems. Macromolecules 2002. [DOI: 10.1021/ma011523+] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
46
|
Sebastian JM, Lai C, Graessley WW, Register RA, Marchand GR. Steady-Shear Rheology of Block Copolymer Melts: Zero-Shear Viscosity and Shear Disordering in Body-Centered-Cubic Systems. Macromolecules 2002. [DOI: 10.1021/ma011522h] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- John M. Sebastian
- Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
| | - Chiajen Lai
- Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
| | - William W. Graessley
- Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
| | - Richard A. Register
- Department of Chemical Engineering and Princeton Materials Institute, Princeton University, Princeton, New Jersey 08544
| | - Gary R. Marchand
- The Dow Chemical Company, P.O. Box 400, Plaquemine, Louisiana 70765
| |
Collapse
|
47
|
|
48
|
Förster S, Berton B, Hentze HP, Krämer E, Antonietti M, Lindner P. Lyotropic Phase Morphologies of Amphiphilic Block Copolymers. Macromolecules 2001. [DOI: 10.1021/ma001923h] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- S. Förster
- Institut für Physikalische Chemie, Universität Hamburg, Bundesstrasse 45, D-20146 Hamburg, Germany
| | - B. Berton
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg, D-14476 Golm, Germany
| | - H.-P. Hentze
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg, D-14476 Golm, Germany
| | - E. Krämer
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg, D-14476 Golm, Germany
| | - M. Antonietti
- Max-Planck-Institut für Kolloid- und Grenzflächenforschung, Am Mühlenberg, D-14476 Golm, Germany
| | - P. Lindner
- Institut Laue-Langevin, Avenue des Martyrs, BP 156, F-38042 Grenoble Cedex 9, France
| |
Collapse
|
49
|
Senff H, Richtering W. Temperature sensitive microgel suspensions: Colloidal phase behavior and rheology of soft spheres. J Chem Phys 1999. [DOI: 10.1063/1.479430] [Citation(s) in RCA: 554] [Impact Index Per Article: 22.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
50
|
Affiliation(s)
- A. Jusufi
- Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
| | - M. Watzlawek
- Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
| | - H. Löwen
- Institut für Theoretische Physik II, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, D-40225 Düsseldorf, Germany
| |
Collapse
|