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Lee K, Das M, Pitell M, Wirth CL. Surfactant induced catastrophic collapse of carbon black suspensions used in flow battery application. J Colloid Interface Sci 2023; 633:712-722. [PMID: 36481426 DOI: 10.1016/j.jcis.2022.11.097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 11/14/2022] [Accepted: 11/18/2022] [Indexed: 12/03/2022]
Abstract
HYPOTHESIS Carbon black particles act as electronically conductive additives in the slurry electrodes used in electrochemical redox flow batteries. Modifying the carbon black slurry formulation with the addition of a nonionic surfactant could impart improved particle dispersion, gravitational stability, and flowability leading to better battery performance. EXPERIMENTS Carbon black particles were dispersed in 1 M H2SO4 with volume fractions Φ = 0.01 to 0.06 and a nonionic surfactant (Triton X-100) concentration of csurf. = 0, 0.05, and 0.1 M. Particle size was characterized using microscopy and surfactant adsorption using UV-vis spectroscopy. Sedimentation kinetics was measured using a custom camera set-up that tracks the height of the settling particle bed. Rheology experiments were conducted to measure linear viscoelasticity and shear flow behavior. FINDINGS The sedimentation dynamics of the slurry resembled that of a gel collapse. At short times we observed fast sedimentation associated with structural gel collapse and at long times very slow sedimentation associated with compaction of the sediment. Rheological investigations revealed that the slurry indeed behaved like colloidal gels. Addition of nonionic surfactant at α (= (csurf./cCB)) < 0.75 improved particle dispersion and increased gel elasticity. However, α> 0.75 led to a weaker gel that exhibits a fast 'catastrophic collapse' under gravity.
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Affiliation(s)
- KangJin Lee
- Department of Chemical and Biomolecular Engineering, Case Western Reserve Unviersity, 10900 Euclid Ave, Cleveland 44106, OH, USA
| | - Mohan Das
- Department of Chemical and Biomolecular Engineering, Case Western Reserve Unviersity, 10900 Euclid Ave, Cleveland 44106, OH, USA.
| | - Matthew Pitell
- Department of Chemical and Biomolecular Engineering, Case Western Reserve Unviersity, 10900 Euclid Ave, Cleveland 44106, OH, USA
| | - Christopher L Wirth
- Department of Chemical and Biomolecular Engineering, Case Western Reserve Unviersity, 10900 Euclid Ave, Cleveland 44106, OH, USA
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2
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Perez SJLP, Montalbo RCK, Concio CAP, Madrid LLB, Arco SD. Thermoresponsive oligo(ethylene glycol) methyl ether methacrylate homopolymers via RAFT polymerization in 1-alkyl-3-methylimidazolium hexafluorophosphate ionic liquids. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2022. [DOI: 10.1080/10601325.2022.2117054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Affiliation(s)
- Ser John Lynon P. Perez
- Natural Sciences Research Institute, University of the Philippines Diliman, Quezon City, Philippines
| | | | - Christian Angelo P. Concio
- Synthetic Organic Chemistry Laboratory Institute of Chemistry, University of the Philippines Diliman, Quezon City, Philippines
| | - Ludhovik Luiz B. Madrid
- Synthetic Organic Chemistry Laboratory Institute of Chemistry, University of the Philippines Diliman, Quezon City, Philippines
| | - Susan D. Arco
- Natural Sciences Research Institute, University of the Philippines Diliman, Quezon City, Philippines
- Synthetic Organic Chemistry Laboratory Institute of Chemistry, University of the Philippines Diliman, Quezon City, Philippines
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Amselem S. Remote Controlled Autonomous Microgravity Lab Platforms for Drug Research in Space. Pharm Res 2019; 36:183. [PMID: 31741058 DOI: 10.1007/s11095-019-2703-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2019] [Accepted: 09/13/2019] [Indexed: 12/23/2022]
Abstract
Research conducted in microgravity conditions has the potential to yield new therapeutics, as advances can be achieved in the absence of phenomena such as sedimentation, hydrostatic pressure and thermally-induced convection. The outcomes of such studies can significantly contribute to many scientific and technological fields, including drug discovery. This article reviews the existing traditional microgravity platforms as well as emerging ideas for enabling microgravity research focusing on SpacePharma's innovative autonomous remote-controlled microgravity labs that can be launched to space aboard nanosatellites to perform drug research in orbit. The scientific literature is reviewed and examples of life science fields that have benefited from studies in microgravity conditions are given. These include the use of microgravity environment for chemical applications (protein crystallization, drug polymorphism, self-assembly of biomolecules), pharmaceutical studies (microencapsulation, drug delivery systems, behavior and stability of colloidal formulations, antibiotic drug resistance), and biological research, including accelerated models for aging, investigation of bacterial virulence , tissue engineering using organ-on-chips in space, enhanced stem cells proliferation and differentiation.
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Affiliation(s)
- Shimon Amselem
- SpacePharma R&D Israel LTD, 1st Aba Even Av, 4672519, Herzliya Pituach, Israel. .,SpacePharma SA, Rue l'Armeratte 3, 2950, Courgenay, Switzerland.
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Soliman ME, Elmowafy E, Casettari L, Alexander C. Star-shaped poly(oligoethylene glycol) copolymer-based gels: Thermo-responsive behaviour and bioapplicability for risedronate intranasal delivery. Int J Pharm 2018; 543:224-233. [PMID: 29604369 DOI: 10.1016/j.ijpharm.2018.03.053] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2018] [Revised: 03/17/2018] [Accepted: 03/27/2018] [Indexed: 11/16/2022]
Abstract
The aim of this work was to obtain an intranasal delivery system with improved mechanical and mucoadhesive properties that could provide prolonged retention time for the delivery of risedronate (RS). For this, novel in situ forming gels comprising thermo-responsive star-shaped polymers, utilizing either polyethylene glycol methyl ether (PEGMA-ME 188, Mn 188) or polyethylene glycol ethyl ether (PEGMA-EE 246, Mn 246), with polyethylene glycol methyl ether (PEGMA-ME 475, Mn 475), were synthesized and characterized. RS was trapped in the selected gel-forming solutions at a concentration of 0.2% w/v. The pH, rheological properties, in vitro drug release, ex vivo permeation as well as mucoadhesion were also examined. MTT assays were conducted to verify nasal tolerability of the developed formulations. Initial in vivo studies were carried out to evaluate anti-osteoporotic activity in a glucocorticoid induced osteoporosis model in rats. The results showed successful development of thermo-sensitive formulations with favorable mechanical properties at 37 °C, which formed non-irritant, mucoadhesive porous networks, facilitating nasal RS delivery. Moreover, sustained release of RS, augmented permeability and marked anti-osteoporotic efficacy as compared to intranasal (IN) and intravenous (IV) RS solutions were realized. The combined results show that the in situ gels should have promising application as nasal drug delivery systems.
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Affiliation(s)
- Mahmoud E Soliman
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo 11566, Egypt
| | - Enas Elmowafy
- Department of Pharmaceutics and Industrial Pharmacy, Faculty of Pharmacy, Ain Shams University, Monazzamet Elwehda Elafrikeya Street, Abbaseyya, Cairo 11566, Egypt
| | - Luca Casettari
- Department of Biomolecular Sciences, School of Pharmacy, University of Urbino Carlo Bo, Piazza del Rinascimento, 6, 61029 Urbino, PU, Italy.
| | - Cameron Alexander
- School of Pharmacy, Boots Science Building, University of Nottingham, University Park, NG7 2RD Nottingham, UK
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Park N, Conrad JC. Phase behavior of colloid-polymer depletion mixtures with unary or binary depletants. SOFT MATTER 2017; 13:2781-2792. [PMID: 28345105 DOI: 10.1039/c6sm02891h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Adding depletants to a colloidal suspension induces an attractive interparticle interaction that can be tuned to obtain desired structures or to probe phase behavior. When the depletant is not uniform in size, however, both the range and strength of the attraction become difficult to predict and hence control. We investigated the effects of depletant bidispersity on the non-equilibrium phase behavior of colloid-polymer mixtures. We added unary or binary mixtures of polystyrene as the depletant to suspensions of charged poly(methyl methacrylate) particles. The structure and dynamics of the particles were compared over three sets of samples with various mixtures of two different polystyrenes whose size varied by an order of magnitude. The structure and dynamics were nearly independent of depletant dispersity if the polymer concentration was represented as a sum of normalized concentrations of each species. Near the transition region between a fluid of clusters and an interconnected gel at intermediate volume fractions, partitioning of polymers in a binary mixture into colloid-rich and polymer-rich phase leads to a slightly different gelation pathway.
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Affiliation(s)
- Nayoung Park
- Department of Chemical and Biomolecular Engineering, University of Houston, Houston, TX 77204-4004, USA.
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de Castro P, Sollich P. Phase separation dynamics of polydisperse colloids: a mean-field lattice-gas theory. Phys Chem Chem Phys 2017; 19:22509-22527. [DOI: 10.1039/c7cp04062h] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Strong theoretical evidence shows that dense colloidal mixtures phase-separate in two stages and the denser phase contains long-lived composition heterogeneities.
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Affiliation(s)
- Pablo de Castro
- Disordered Systems Group
- Department of Mathematics
- King's College London
- London
- UK
| | - Peter Sollich
- Disordered Systems Group
- Department of Mathematics
- King's College London
- London
- UK
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Shin K, Kim JW, Park H, Choi HS, Chae PS, Nam YS, Kim JW. Fabrication and stabilization of nanoscale emulsions by formation of a thin polymer membrane at the oil–water interface. RSC Adv 2015. [DOI: 10.1039/c5ra03872c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Extremely stable O/W nanoemulsions are fabricated by effective assembly of an amphiphilic PEO-b-PCL copolymer at the oil–water interface during phase inversion, which favors formation of a thin PEO-b-PCL film at the interface.
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Affiliation(s)
- Kyounghee Shin
- Department of Bionano Technology
- Hanyang University
- Ansan
- Republic of Korea
- R&D Center
| | - Jeong Won Kim
- Department of Bionano Technology
- Hanyang University
- Ansan
- Republic of Korea
| | - Hanhee Park
- Department of Applied Chemistry
- Hanyang University
- Ansan
- Republic of Korea
| | | | - Pil Seok Chae
- Department of Bionano Technology
- Hanyang University
- Ansan
- Republic of Korea
| | - Yoon Sung Nam
- Department of Materials Science and Engineering
- Korea Advanced Institute of Science and Technology
- Daejeon
- Republic of Korea
| | - Jin Woong Kim
- Department of Bionano Technology
- Hanyang University
- Ansan
- Republic of Korea
- Department of Applied Chemistry
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Gong X, Hua L, Wei J, Ngai T. Tuning the particle-surface interactions in aqueous solutions by soft microgel particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:13182-13190. [PMID: 25312378 DOI: 10.1021/la503573u] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Due to the softness and deformability, interaction between colloidal surfaces induced by soft particles varies in a more complex way than for solid particles and thus has attracted much attention in recent years. In the present study, we use total internal reflection microscopy (TIRM) to directly measure the interaction between polystyrene (PS) microparticles and a flat glass surface in a poly(N-isopropylacrylamide) (PNIPAM) microgel dispersion with concentration varying from dilute (0.1 wt %) to highly concentrated regime (7.5 wt %). Our result shows that the PS particle-surface interactions mediated by the soft microgels are greatly affected by the particle concentration, the configuration of those microgels adsorbed on the surfaces, and the structure and packing of microgels in bulk solution. With increasing the microgel concentration (Cmicrogel), the interaction between the PS particle and surface turned from bridging attraction to steric repulsion, and then depletion attraction, which were mainly governed by the adsorption amount and configuration of microgels on the two surfaces. By further increasing Cmicrogel to condensed situation, structural force with oscillated energy wells was detected. The variation of interactions induced by the soft microgels was further confirmed by optical imaging. Crystallization of the PS microparticles appeared at moderate Cmicrogel; however, crystallization was hindered at higher Cmicrogel where the microgels are highly packed in the bulk solution. Furthermore, using TIRM, microgel packing with local energy well (0.1-1.0 kBT) at the highly condensed state (7.5 wt %) was resolved from the interaction profiles. Therefore, the shear force and modulus generated by such microgel packing can be determined as ∼0.2 pN and tens of mPa, respectively, which are much weaker than data given by conventional active methods.
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Affiliation(s)
- Xiangjun Gong
- Faculty of Materials Science and Engineering, South China University of Technology , Guangzhou, China , 510640
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Secchi E, Buzzaccaro S, Piazza R. Time-evolution scenarios for short-range depletion gels subjected to the gravitational stress. SOFT MATTER 2014; 10:5296-5310. [PMID: 24913393 DOI: 10.1039/c4sm00299g] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
By exploiting photon correlation imaging and ghost particle velocimetry, two novel optical correlation techniques particularly suited to the investigation of the microscopic dynamics of spatially heterogeneous samples, we investigate the settling and restructuring dynamics of colloidal gels generated by short-ranged depletion interactions. Three distinct regions can be clearly set apart within the liquid-liquid coexistence region of the phase diagram where gel formation is observed. When depletion forces are barely sufficient to drive the system within the metastable region, an initial disordered gel hosts the rapid nucleation of crystallites, which stress the gel structure until it fully collapses, leading to the formation of a macroscopic colloidal crystal. For stronger attractive forces, two distinct scenarios are observed, depending on the particle volume fraction ϕ0 of the original suspension. At low ϕ0, the gel breaks after a short delay time into separate clusters, which rapidly settle until they compact in a denser disordered phase. The latter eventually undergoes a slow compression, which is accounted for by a poroelastic model where the microscopic gel dynamics is fully ruled by its macroscopic deformation. Yet, it is the intermediate stage between cluster settling and final compaction which displays very peculiar features, evidenced by anomalous settling profiles which are not shared, to our knowledge, by any other sedimentation processes investigated so far. For larger values of ϕ0, gel breaking is conversely suppressed, the structure undergoes a continuous compression that cannot be explained by a poroelastic model, and the microscopic dynamics is characterized by logarithmic correlation functions resembling those found for attractive glasses.
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Affiliation(s)
- Eleonora Secchi
- CMIC, Dipartimento di Chimica, Materiali e Ingegneria Chimica, Politecnico di Milano, 20133 Milano, Italy.
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Lee GJ, Son HA, Cho JW, Choi SK, Kim HT, Kim JW. Stabilization of pickering emulsions by generating complex colloidal layers at liquid–liquid interfaces. J Colloid Interface Sci 2014; 413:100-5. [DOI: 10.1016/j.jcis.2013.09.015] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 09/13/2013] [Accepted: 09/14/2013] [Indexed: 10/26/2022]
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11
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Liu JX, Men YF. Phase behavior of charge stablized colloid dispersion with added water soluble polymers. CHINESE JOURNAL OF POLYMER SCIENCE 2013. [DOI: 10.1007/s10118-013-1308-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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12
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Zhang S, Shi T, You J, Li Y. Solvent annealing induced phase separation and dewetting in PMMA/SAN blend films: composition dependence. Polym Chem 2013. [DOI: 10.1039/c3py00290j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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13
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Repin N, Scanlon MG, Gary Fulcher R. Phase behaviour of casein micelles and barley beta-glucan polymer molecules in dietary fibre-enriched dairy systems. J Colloid Interface Sci 2012; 377:7-12. [DOI: 10.1016/j.jcis.2012.02.021] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 12/13/2011] [Accepted: 02/11/2012] [Indexed: 10/28/2022]
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Clara-Rahola J, Fernandez-Nieves A, Sierra-Martin B, South AB, Lyon LA, Kohlbrecher J, Fernandez Barbero A. Structural properties of thermoresponsive poly(N-isopropylacrylamide)-poly(ethyleneglycol) microgels. J Chem Phys 2012; 136:214903. [DOI: 10.1063/1.4723686] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bartlett P, Teece LJ, Faers MA. Sudden collapse of a colloidal gel. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2012; 85:021404. [PMID: 22463209 DOI: 10.1103/physreve.85.021404] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Revised: 12/13/2011] [Indexed: 05/31/2023]
Abstract
Metastable gels formed by weakly attractive colloidal particles display a distinctive two-stage time-dependent settling behavior under their own weight. Initially, a space-spanning network is formed that, for a characteristic time, which we define as the lag time τ(d), resists compaction. This solidlike behavior persists only for a limited time. Gels whose age t(w) is greater than τ(d) yield and suddenly collapse. We use a combination of confocal microscopy, rheology, and time-lapse video imaging to investigate both the process of sudden collapse and its microscopic origin in a refractive-index matched emulsion-polymer system. We show that the height h of the gel in the early stages of collapse is well described by the surprisingly simple expression, h(τ)=h(0)-Aτ(3/2), with h(0) the initial height and τ=t(w)-τ(d) the time counted from the instant where the gel first yields. We propose that this unexpected result arises because the colloidal network progressively builds up internal stress as a consequence of localized rearrangement events, which leads ultimately to collapse as thermal equilibrium is reestablished.
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Affiliation(s)
- Paul Bartlett
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom.
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You J, Liao Y, Men Y, Shi T, An L, Li X. Composition Effect on Interplay between Phase Separation and Dewetting in PMMA/SAN Blend Ultrathin Films. Macromolecules 2011. [DOI: 10.1021/ma200082m] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jichun You
- College of Material Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 310036, China
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Yonggui Liao
- School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Yongfeng Men
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Tongfei Shi
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Lijia An
- State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
| | - Xiuhong Li
- SSRF, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
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Zhou J, van Duijneveldt JS, Vincent B. Two-stage phase separation in ternary colloid–polymer mixtures. Phys Chem Chem Phys 2011; 13:110-3. [DOI: 10.1039/c0cp01523g] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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