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Zypman FR. Charge-Regulated Interactions: The Case of a Nanoparticle and a Sphere of Arbitrary Dielectric Constants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:3561-3567. [PMID: 35258985 DOI: 10.1021/acs.langmuir.2c00141] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Surfaces of objects immersed in liquid develop an electric charge density that depends on the types and concentrations of dissolved ions. The strength and spatial distribution of this charge density controls a myriad of processes, from biological to industrial processes. In addition, the lack of a full understanding of the charge density precludes a complete foundational interpretation of liquid-mediated many-body interactions. This understanding is especially obscured by charge regulation, whereby the charge on an object hinges, in addition, on the charges and locations of all other charged objects in the liquid. Here, we present a rigorous mathematical approach based on the Poisson-Boltzmann Equation, with field-dependent boundary conditions, and apply it to obtain the liquid-mediated interaction energy between a charged dielectric sphere and a charged particle. The framework that we develop in this article should be of use beyond the limits of the example application considered here: it should be useful as a conceptual and technical starting point to obtain charge-regulated many-body interactions in liquids.
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Affiliation(s)
- Fredy R Zypman
- Department of Engineering Physics, Yeshiva University, Manhattan, New York, New York 10033, United States
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2
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Han JH, Shneidman AV, Kim DY, Nicolas NJ, Hoeven JES, Aizenberg M, Aizenberg J. Highly Ordered Inverse Opal Structures Synthesized from Shape‐Controlled Nanocrystal Building Blocks. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202111048] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Jae Hyo Han
- Department of Chemistry and Chemical Biology & John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Anna V. Shneidman
- John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Do Yoon Kim
- John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Natalie J. Nicolas
- John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Jessi E. S. Hoeven
- Department of Chemistry and Chemical Biology & John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Michael Aizenberg
- John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
| | - Joanna Aizenberg
- Department of Chemistry and Chemical Biology & John A. Paulson School of Engineering and Applied Sciences Harvard University 29 Oxford St. Cambridge MA 02138 USA
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3
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Han JH, Shneidman AV, Kim DY, Nicolas NJ, van der Hoeven JES, Aizenberg M, Aizenberg J. Highly Ordered Inverse Opal Structures Synthesized from Shape-Controlled Nanocrystal Building Blocks. Angew Chem Int Ed Engl 2021; 61:e202111048. [PMID: 34606677 DOI: 10.1002/anie.202111048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/27/2021] [Indexed: 01/29/2023]
Abstract
Three-dimensional ordered porous materials known as inverse opal films (IOFs) were synthesized using nanocrystals with precisely defined morphologies. Comprehensive theoretical and experimental studies of the volume fraction ratio and electrostatic interactions between nanocrystals and polystyrene templating particles enabled the formation of highly ordered crack-free photonic structures. The synthetic strategy was first demonstrated using titanium dioxide (TiO2 ) nanocrystals of different shapes and then generalized to assemble nanocrystals of other functional materials, such as indium tin oxide and zinc-doped ferrite. Tunable photocatalytic activity of the TiO2 IOFs, modulated through the choice of the shape of TiO2 nanocrystals in conjunction with selecting desired macroscopic features of the IOF, was further explored. In particular, enhanced activity is observed for crack-free, highly ordered IOFs whose photonic properties can improve light absorption via the slow light effect. This study opens new opportunities in designing multi-length-scale porous nanoarchitectures having enhanced performance in a variety of applications.
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Affiliation(s)
- Jae Hyo Han
- Department of Chemistry and Chemical Biology &, John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA 02138, USA
| | - Anna V Shneidman
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA, 02138, USA
| | - Do Yoon Kim
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA, 02138, USA
| | - Natalie J Nicolas
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA, 02138, USA
| | - Jessi E S van der Hoeven
- Department of Chemistry and Chemical Biology &, John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA 02138, USA
| | - Michael Aizenberg
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA, 02138, USA
| | - Joanna Aizenberg
- Department of Chemistry and Chemical Biology &, John A. Paulson School of Engineering and Applied Sciences, Harvard University, 29 Oxford St., Cambridge, MA 02138, USA
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4
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Howard MP, Jadrich RB, Lindquist BA, Khabaz F, Bonnecaze RT, Milliron DJ, Truskett TM. Structure and phase behavior of polymer-linked colloidal gels. J Chem Phys 2019; 151:124901. [DOI: 10.1063/1.5119359] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Michael P. Howard
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | - Ryan B. Jadrich
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
- Center for Nonlinear Studies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Beth A. Lindquist
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
| | - Fardin Khabaz
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | - Roger T. Bonnecaze
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | - Delia J. Milliron
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | - Thomas M. Truskett
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
- Department of Physics, University of Texas at Austin, Austin, Texas 78712, USA
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5
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Moradi M, He Q, Willing GA. Tuning the stabilization mechanism of nanoparticle-regulated complex fluids. Colloids Surf A Physicochem Eng Asp 2019. [DOI: 10.1016/j.colsurfa.2019.06.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Grady ZA, Arthur AZ, Wohl CJ. Topological Control of Polystyrene-Silica Core-Shell Microspheres. Colloids Surf A Physicochem Eng Asp 2019; 560:136-140. [PMID: 33479556 DOI: 10.1016/j.colsurfa.2018.10.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Controllable surface morphology is requisite across a gamut of processes, industries, and applications. The surface morphology of silica-coated polystyrene microspheres was controllably modified to enable generation of both smooth and bumpy, or raspberry-like, surfaces. Although smooth and raspberry-like silica shells on polystyrene templates have been demonstrated extensively, the method described here used readily available materials to produce radical changes in surface morphology from a single polystyrene template coated in silica through a facile sol-gel reaction processes. Silica shells were deposited via a sol-gel process (using tetraethyl orthosilicate as the silica precursor) onto 1 to 2 μm diameter anionic polystyrene spheres, fabricated by emulsifier-free polymerization. By varying of the concentration of silica precursor and ammonium hydroxide catalyst and altering the electrostatic surface interactions via addition of a cationic polymeric brush, an array of surface topologies was generated. The resulting silica shells ranged from 100 to 200 nm in thickness, as measured by calcination of the polystyrene template. Empirical relations between reaction conditions and the resulting silica colloid diameter were utilized to understand the resultant silica shell topology. These results may serve as a guide to generate a versatile platform for research in the multitude of applications where polystyrene-silica core-shell particles are utilized.
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Affiliation(s)
- Zane A Grady
- NASA Internships, Fellowships, and Scholars, NASA Langley Research Center, Hampton, VA 23681, USA
| | - Alexandria Z Arthur
- NASA Internships, Fellowships, and Scholars, NASA Langley Research Center, Hampton, VA 23681, USA
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7
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Weight BM, Denton AR. Structure and stability of charged colloid-nanoparticle mixtures. J Chem Phys 2018; 148:114904. [DOI: 10.1063/1.5004443] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Braden M. Weight
- Department of Physics, North Dakota State University, Fargo, North Dakota 58108-6050, USA
| | - Alan R. Denton
- Department of Physics, North Dakota State University, Fargo, North Dakota 58108-6050, USA
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8
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Denton AR. Effective electrostatic interactions in colloid-nanoparticle mixtures. Phys Rev E 2017; 96:062610. [PMID: 29347449 DOI: 10.1103/physreve.96.062610] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Indexed: 06/07/2023]
Abstract
Interparticle interactions and bulk properties of colloidal suspensions can be substantially modified by the addition of nanoparticles. Extreme asymmetries in size and charge between colloidal particles and nanoparticles present severe computational challenges to molecular-scale modeling of such complex systems. We present a statistical mechanical theory of effective electrostatic interactions that can greatly ease large-scale modeling of charged colloid-nanoparticle mixtures. By applying a sequential coarse-graining procedure, we show that a multicomponent mixture of charged colloids, nanoparticles, counterions, and coions can be mapped first onto a binary mixture of colloids and nanoparticles and then onto a one-component model of colloids alone. In a linear-response approximation, the one-component model is governed by a single effective pair potential and a one-body volume energy, whose parameters depend nontrivially on nanoparticle size, charge, and concentration. To test the theory, we perform molecular dynamics simulations of the two-component and one-component models and compute structural properties. For moderate electrostatic couplings, colloid-colloid radial distribution functions and static structure factors agree closely between the two models, validating the sequential coarse-graining approach. Nanoparticles of sufficient charge and concentration enhance screening of electrostatic interactions, weakening correlations between charged colloids and destabilizing suspensions, consistent with experiments.
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Affiliation(s)
- Alan R Denton
- Department of Physics, North Dakota State University, Fargo, North Dakota 58108-6050, USA
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9
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Lindquist BA, Jadrich RB, Milliron DJ, Truskett TM. On the formation of equilibrium gels via a macroscopic bond limitation. J Chem Phys 2016; 145:074906. [DOI: 10.1063/1.4960773] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Affiliation(s)
- B. A. Lindquist
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | - R. B. Jadrich
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | - D. J. Milliron
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
| | - T. M. Truskett
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas 78712, USA
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10
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Zubir MNM, Badarudin A, Kazi S, Misran M, Amiri A, Sadri R, Khalid S. Experimental investigation on the use of highly charged nanoparticles to improve the stability of weakly charged colloidal system. J Colloid Interface Sci 2015; 454:245-55. [DOI: 10.1016/j.jcis.2015.05.019] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2015] [Revised: 05/10/2015] [Accepted: 05/12/2015] [Indexed: 10/23/2022]
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11
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Adsorption and stabilizing effects of highly-charged latex nanoparticles in dispersions of weakly-charged silica colloids. J Colloid Interface Sci 2015; 449:143-51. [DOI: 10.1016/j.jcis.2014.11.022] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 11/07/2014] [Indexed: 11/18/2022]
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12
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Keramati H, Saidi MH, Zabetian M. Stabilization of the Suspension of Zirconia Microparticle Using the Nanoparticle Halos Mechanism: Zeta Potential Effect. J DISPER SCI TECHNOL 2015. [DOI: 10.1080/01932691.2015.1015077] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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13
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Kazi SN, Badarudin A, Zubir MNM, Ming HN, Misran M, Sadeghinezhad E, Mehrali M, Syuhada NI. Investigation on the use of graphene oxide as novel surfactant to stabilize weakly charged graphene nanoplatelets. NANOSCALE RESEARCH LETTERS 2015; 10:212. [PMID: 25995712 PMCID: PMC4435691 DOI: 10.1186/s11671-015-0882-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Accepted: 03/26/2015] [Indexed: 05/21/2023]
Abstract
This paper presents a unique synergistic behavior between a graphene oxide (GO) and graphene nanoplatelet (GnP) composite in an aqueous medium. The results showed that GO stabilized GnP colloid near its isoelectric point and prevented rapid agglomeration and sedimentation. It was considered that a rarely encountered charge-dependent electrostatic interaction between the highly charged GO and weakly charged GnP particles kept GnP suspended at its rapid coagulation and phase separation pH. Sedimentation and transmission electron microscope (TEM) micrograph images revealed the evidence of highly stable colloidal mixtures while zeta potential measurement provided semi-quantitative explanation on the mechanism of stabilization. GnP suspension was confirmed via UV-vis spectral data while contact angle measurement elucidated the close resemblance to an aqueous solution indicating the ability of GO to mediate the flocculation prone GnP colloids. About a tenfold increase in viscosity was recorded at a low shear rate in comparison to an individual GO solution due to a strong interaction manifested between participating colloids. An optimum level of mixing ratio between the two constituents was also obtained. These new findings related to an interaction between charge-based graphitic carbon materials would open new avenues for further exploration on the enhancement of both GO and GnP functionalities particularly in mechanical and electrical domains.
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Affiliation(s)
- Salim Newaz Kazi
- />Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Jalan Universiti, 50603 Kuala Lumpur, Malaysia
| | - Ahmad Badarudin
- />Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Jalan Universiti, 50603 Kuala Lumpur, Malaysia
| | - Mohd Nashrul Mohd Zubir
- />Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Jalan Universiti, 50603 Kuala Lumpur, Malaysia
| | - Huang Nay Ming
- />Low Dimensional Materials Research Centre (LDMRC), Department of Physics, Faculty of Science, University of Malaya, Jalan Universiti, 50603 Kuala Lumpur, Malaysia
| | - Misni Misran
- />Department of Chemistry, Faculty of Science, University of Malaya, Jalan Universiti, 50603 Kuala Lumpur, Malaysia
| | - Emad Sadeghinezhad
- />Department of Mechanical Engineering, Faculty of Engineering, University of Malaya, Jalan Universiti, 50603 Kuala Lumpur, Malaysia
| | - Mohammad Mehrali
- />Department of Mechanical Engineering and Advanced Material Research Centre, University of Malaya, Jalan Universiti, 50603 Kuala Lumpur, Malaysia
| | - Nur Ily Syuhada
- />Low Dimensional Materials Research Centre (LDMRC), Department of Physics, Faculty of Science, University of Malaya, Jalan Universiti, 50603 Kuala Lumpur, Malaysia
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14
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Abstract
AbstractEffects of chlorides of univalent (LiCl, NaCl, KCl), bivalent (MgCl2, BaCl2) and trivalent (AlCl3) metals at different concentration (0.001–0.1 M) on the behavior of nanosilica A-200 (0.5–5 wt.%) in aqueous media are analyzed using photon correlation spectroscopy (particle size distribution, PSD), electrophoresis (zeta potential ζ), potentiometric titration (surface charge density), and estimation of screening length of primary particles and their aggregates. The zeta potential and the PSD are affected by silica content, pH, and concentration and type of dissolved salts. Smaller but more strongly hydrated Li+ cations caused stronger nonlinear dependences of the zeta potential on pH and salt content than Na+ or K+. This nonlinearity is much stronger at a lower content of silica (0.5–1 wt.%) than at C
A-200 = 2.5 or 5 wt.%. At a high concentration of nanosilica (5 wt.%) the effect of K+ ions causes stronger diminution of the negative value of the zeta potential due to better adsorption of larger cations. Therefore, the influence of K+ on increasing screening length is stronger than that of Na+ for both primary nanoparticles and their aggregates. A similar difference in the ζ values is observed for different in size cations Ba2+ and Mg2+.
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15
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Chung JK, Denton AR. Effective electrostatic interactions in mixtures of charged colloids. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2013; 88:022306. [PMID: 24032832 DOI: 10.1103/physreve.88.022306] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2013] [Revised: 07/09/2013] [Indexed: 06/02/2023]
Abstract
We present a theory of effective electrostatic interactions in polydisperse suspensions of charged macroions, generalizing to mixtures a theory previously developed for monodisperse suspensions. Combining linear response theory with a random phase approximation for microion correlations, we coarse grain the microion degrees of freedom to derive general expressions for effective macroion-macroion pair potentials and a one-body volume energy. For model mixtures of charged hard-sphere colloids, we give explicit analytical expressions. The resulting effective pair potentials have the same general form as predicted by linearized Poisson-Boltzmann theory, but consistently incorporate dependence on macroion density and excluded volume via the Debye screening constant. The volume energy, which depends on the average macroion density, contributes to the free energy and so can influence thermodynamic properties of deionized suspensions. To validate the theory, we compute radial distribution functions of binary mixtures of oppositely charged colloidal macroions from molecular dynamics simulations of the coarse-grained model (with implicit microions), taking effective pair potentials as input. Our results agree closely with corresponding results from more computationally intensive Monte Carlo simulations of the primitive model (with explicit microions). Simulations of a mixture with large size and charge asymmetries indicate that charged nanoparticles can enhance electrostatic screening of charged colloids. The theory presented here lays a foundation for future large-scale modeling of complex mixtures of charged colloids, nanoparticles, and polyelectrolytes.
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Affiliation(s)
- Jun Kyung Chung
- Department of Physics, North Dakota State University, Fargo, North Dakota 58108-6050, USA
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16
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Herman D, Walz JY. Stabilization of weakly charged microparticles using highly charged nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:5982-94. [PMID: 23594145 DOI: 10.1021/la400699g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
An experimental study was performed to understand the ability of highly charged nanoparticles to stabilize a dispersion of weakly charged microspheres. The experiments involved adding either anionic (sulfate) or cationic (amidine) latex nanoparticles to dispersions of micrometer-sized silica particles near the silica isoelectric point (IEP). Although both types of nanoparticles increased the zeta potential of the silica microspheres above the value at which dispersions containing only silica spheres remained stable, only with the amidine nanoparticles was stability obtained. Adsorption tests with flat silica slides showed that the amidine nanoparticles deposited in much greater numbers onto the silica, producing multilayer coverage with adsorbed particle densities that were roughly three times that obtained with the sulfate nanoparticles. A model calculating the DLVO interaction between the silica spheres in which the adsorbed nanoparticle layers were treated as a continuous film with dielectric properties between those of polystyrene and water predicted stability for both systems. It is hypothesized that the relatively low adsorption of the sulfate nanoparticles (fractional surface coverages ≤ 25%) led to patches of bare silica on the microspheres that could align during interaction due to Brownian motion. These results indicate that highly charged nanoparticles can be effective stabilizers provided the level of adsorption is sufficiently high. It was also found that the zeta potential alone is not a sufficient parameter for predicting stability of these binary systems.
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Affiliation(s)
- David Herman
- Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24060, United States
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17
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Trulsson M, Jönsson B, Labbez C. On the origin of the halo stabilization. Phys Chem Chem Phys 2013; 15:541-5. [DOI: 10.1039/c2cp42404e] [Citation(s) in RCA: 8] [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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18
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Xing X, Sun G, Li Z, Ngai T. Stabilization of colloidal suspensions: competing effects of nanoparticle halos and depletion mechanism. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:16022-8. [PMID: 23116222 DOI: 10.1021/la303547m] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Bimodal colloidal mixtures of nanoparticles and microparticles may show different phase behaviors depending upon the interparticle interaction of both species. In the present work, we examined the stabilization of spherical microparticles using highly charged, spherical nanoparticles. Total internal reflection microscopy (TIRM) was used to measure the interaction forces between a charged microparticle and flat glass substrate in aqueous solutions at varying volume fractions of nanoparticles of the same sign. We found that, in the system containing of highly charged nanoparticles, microparticle, and glass substrate, non-adsorbing charged nanoparticles in solution did not lead to depletion attraction. Instead, the addition of nanoparticles was to consistently create a repulsive force between the microparticle and glass substrate even at a very low nanoparticle volume fraction. This result might attributed to the formation of thin shells (halos) with a high local nanoparticle volume fraction to the region near the glass surface, resulting in electrostatic repulsion between the decorated surfaces. This study demonstrates that nanoparticle halos can also arise in binary systems of mutually but highly repulsive microparticle/nanoparticle dispersions.
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Affiliation(s)
- Xiaochen Xing
- Department of Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong
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19
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Juhnke M, John E. Wet-Media Milling of Colloidal Drug Suspensions Stabilized by Means of Charged Nanoparticles. Chem Eng Technol 2012. [DOI: 10.1002/ceat.201200139] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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20
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Manipulating microparticle interactions using highly charged nanoparticles. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2011.12.040] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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McKee CT, Walz JY. Interaction forces between colloidal particles in a solution of like-charged, adsorbing nanoparticles. J Colloid Interface Sci 2012; 365:72-80. [DOI: 10.1016/j.jcis.2011.09.015] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2011] [Revised: 07/31/2011] [Accepted: 09/10/2011] [Indexed: 12/01/2022]
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22
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Savarala S, Ahmed S, Ilies MA, Wunder SL. Stabilization of soft lipid colloids: competing effects of nanoparticle decoration and supported lipid bilayer formation. ACS NANO 2011; 5:2619-2628. [PMID: 21381770 DOI: 10.1021/nn1025884] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Stabilization against fusion of zwitterionic lipid small unilamellar vesicles (SUVs) by charged nanoparticles is essential to prevent premature inactivation and cargo unloading. In the present work, we examined the stabilization of DMPC and DPPC SUVs by monolithic silica (SiO(2)) nanoparticle envelopment, for SiO(2) with 4-6, 10-20, 20-30, and 40-50 nm nominal diameter. We found that for these soft colloids stabilization is critically dependent on whether fusion occurs between the charged nanoparticles and neutral SUVs to form supported lipid bilayers (SLBs), or whether the reverse occurs, namely, nanoparticle decoration of the SUVs. While SLB formation is accompanied by precipitation, nanoparticle decoration results in long-term stabilization of the SUVs. The fate of the nanosystem depends on the size of the nanoparticles and on the ionic strength of the medium. We found that, in the case of highly charged SiO(2) nanoparticles in water, there is no SUV fusion to SiO(2) for a specific range of nanoparticle sizes. Instead, the negatively charged SiO(2) nanoparticles surround the uncharged SUVs, resulting in electrostatic repulsion between the decorated SUVs, thus preventing their aggregation and precipitation. Addition of millimolar amounts of NaCl results in rapid SLB formation and precipitation. This study has great potential impact toward better understanding the interaction of nanoparticles with biological membranes and the factors affecting their use as drug carriers or sensors.
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Affiliation(s)
- Sushma Savarala
- Department of Chemistry, College of Science and Technology, Temple University, Philadelphia, Pennsylvania 19122, USA
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23
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Ashton DJ, Liu J, Luijten E, Wilding NB. Monte Carlo cluster algorithm for fluid phase transitions in highly size-asymmetrical binary mixtures. J Chem Phys 2010; 133:194102. [DOI: 10.1063/1.3495996] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Zhang Y, Chen H, Zou Q. Anionic surfactant for silica-coated polystyrene composite microspheres prepared with miniemulsion polymerization. Colloid Polym Sci 2009. [DOI: 10.1007/s00396-009-2089-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Hong X, Willing GA. Transition force measurement between two negligibly charged surfaces: a new perspective on nanoparticle halos. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:4929-4933. [PMID: 19301829 DOI: 10.1021/la804103g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Since 2001, silica microspheres have been reported to be stabilized by highly charged hydrous ZrO(2) nanoparticles which form halos around the microspheres at pH 1.5. However, the exact mechanisms behind this novel stabilization method in terms of the relevant interaction forces remain unclear. In order to gain a greater insight into this mechanism, the interaction between a silica flat and a silica sphere in different ZrO(2) nanoparticle suspensions was investigated by the colloid probe technique. The interaction force between a silica flat and a 600 nm silica sphere was first investigated in a ZrO(2) nanoparticle (D approximately 8 nm) suspension with volume fractions of 10(-3), 10(-4), 10(-5), and 10(-6). When the volume fraction of ZrO(2) is 10(-6), only a purely attractive van der Waals force was observed between the silica surfaces. With an increase in the ZrO(2) nanoparticle volume fraction, a peak was detected on the transition force curve at a ZrO(2) volume fraction of 10(-5) while a purely repulsion force was observed for ZrO(2) volume fractions of 10(-4) and 10(-3). The average distance difference between the peak and the zero distance point on the transition force curve which should define the distance between the halo on the microsphere is approximately 2.3 nm. Additionally, the repulsion increases with the effective zeta potential of the binary composite sphere (BCS, the entity of the silica sphere and the surrounding zirconia particles) on an increase of the nanoparticle volume fraction while the adhesion force decreases, which indicates a denser nanoparticle halo.
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Affiliation(s)
- Xiaoting Hong
- Department of Chemical Engineering, University of Louisville, Eastern Parkway, Louisville, Kentucky 40292, USA
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Shindel MM, Mohraz A, Mumm DR, Wang SW. Modulating colloidal adsorption on a two-dimensional protein crystal. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:1038-1046. [PMID: 19099535 DOI: 10.1021/la802911p] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The geometric and physicochemical properties of the protein streptavidin make it a useful building block in the construction and manipulation of nanoscale structures and devices. However, one requirement in exploiting streptavidin for "bottom-up" assembly is the capability to modulate protein-nanoparticle interactions. This work examines the effects of pH and the biotin-streptavidin interaction on the adsorption of colloidal gold onto a two-dimensional streptavidin crystal. Particle deposition was carried out below (pH 6), at (pH 7), and above (pH 8) the protein's isoelectric point with both biotinylated and nonbiotinylated nanoparticles. Particle surface coverage depends on deposition time and pH, and increases by 1.4-10 times when biotin is incorporated onto the particle surface. This coverage is highest for both particle types at pH 6 and decreases monotonically with increasing pH. Calculations of interparticle potentials based on Derjaguin-Landau-Verwey-Overbeek (DLVO) theory demonstrate that this trend in surface coverage is most likely due to alterations in particle-surface electrostatic interactions and not a result of changes in interparticle electrostatic repulsion. Furthermore, post-adsorption alterations in pH demonstrate that electrostatically adsorbed particles can be selectively desorbed from the surface. Evaluation of the nonspecifically adsorbed fraction of biotinylated particles indicates that the receptor-ligand adsorption mechanism gives a higher rate of attachment to the substrate than nonspecific, electrostatic adsorption. This results in faster adsorption kinetics and higher coverages for biotinylated particles relative to the nonbiotinylated case.
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Affiliation(s)
- Matthew M Shindel
- Department of Chemical Engineering and Materials Science, University of California, Irvine, California 92697-2575, USA
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Chan AT, Lewis JA. Size ratio effects on interparticle interactions and phase behavior of microsphere-nanoparticle mixtures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:11399-405. [PMID: 18816017 DOI: 10.1021/la800422g] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
We investigate the interparticle interactions and phase behavior of microsphere-nanoparticle mixtures of high charge asymmetry and varying size ratio. In the absence of nanoparticles, negligibly charged microspheres flocculate as a result of van der Waals interactions. Upon addition of a lower critical nanoparticle volume fraction, the microspheres are stabilized by the formation of nanoparticle halos around each microsphere. , A weak attraction between the two species leads to a pronounced enhancement of the effective nanoparticle concentration near the microsphere surface relative to the bulk solution. Above an upper critical nanoparticle volume fraction, the microspheres undergo reentrant gelation. Binary mixtures, in which the effective nanoparticle size is reduced at a fixed microsphere diameter, exhibit a narrow window of stability that ultimately disappears with increasing ionic strength. By contrast, binary mixtures of varying microsphere diameter are stabilized at similar nanoparticle volume fractions and exhibit a broader window of stability with decreasing size ratio. This unexpected observation may arise from the reduced attraction between smaller microspheres because negligible differences in nanoparticle halo formation are observed in these mixtures.
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Affiliation(s)
- Angel T Chan
- Materials Science and Engineering Department, Frederick Seitz Materials Research Laboratory, University of Illinois, Urbana-Champaign, Urbana, Illinois 61801, USA
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Zhang F, Long GG, Jemian PR, Ilavsky J, Milam VT, Lewis JA. Quantitative measurement of nanoparticle halo formation around colloidal microspheres in binary mixtures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:6504-8. [PMID: 18507406 DOI: 10.1021/la702968n] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A new colloidal stabilization mechanism, known as nanoparticle "haloing" (Tohver, V.; Smay, J. E.; Braem, A.; Braun, P. V.; Lewis, J. A. Proc. Natl. Acad. Sci. U.S.A. 2001, 98, (16), 8950-8954), has been predicted theoretically and inferred experimentally in microsphere-nanoparticle mixtures that possess high charge and size asymmetry. The term "halo" implies the existence of a nonzero separation distance between the highly charged nanoparticles and the negligibly charged microspheres that they surround. By means of ultrasmall-angle X-ray scattering, we have quantified the microsphere-nanoparticle separation distance as well as the number of nanoparticles and their lateral separation distance within the self-organized halos that form in these binary mixtures.
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Affiliation(s)
- Fan Zhang
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439, USA
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Scheer EN, Schweizer KS. Haloing, flocculation, and bridging in colloid-nanoparticle suspensions. J Chem Phys 2008; 128:164905. [DOI: 10.1063/1.2907721] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Harris DJ, Hu H, Conrad JC, Lewis JA. Patterning colloidal films via evaporative lithography. PHYSICAL REVIEW LETTERS 2007; 98:148301. [PMID: 17501317 DOI: 10.1103/physrevlett.98.148301] [Citation(s) in RCA: 112] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2006] [Indexed: 05/15/2023]
Abstract
We investigate evaporative lithography as a route for patterning colloidal films. Films are dried beneath a mask that induces periodic variations between regions of free and hindered evaporation. Direct imaging reveals that particles segregate laterally within the film, as fluid and entrained particles migrate towards regions of higher evaporative flux. The films exhibit remarkable pattern formation that can be regulated by tuning the initial suspension composition, separation distance between the mask and underlying film, and mask geometry.
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Affiliation(s)
- Daniel J Harris
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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Roy S, Kar S, Chaudhuri S, Dasgupta AK. Potential of cadmium sulphide nanorods as an optical microscopic probe to the folding state of cytochrome C. Biophys Chem 2006; 124:52-61. [PMID: 16814922 DOI: 10.1016/j.bpc.2006.05.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2006] [Revised: 05/12/2006] [Accepted: 05/12/2006] [Indexed: 11/22/2022]
Abstract
The folding behavior of cytochrome C (Cyt-C) conjugated with CdS nanorods (CdSnr) is amenable to monitoring by bright field microscopy, the porosity and percolating behavior of such protein conjugated nanoclusters depending on the folding history prior to the conjugation. The method has been used to predict the thermal melting behavior as well as guanidine hydrochloride induced unfolding of Cyt-C. Dynamic light scattering studies indicate that the size distribution of the nanoforms widens in presence of the protein. Furthermore, there is emergence of clusters with higher conductivity and altered zeta potential. Increase of second virial coefficient of CdS nanoforms in the presence of Cyt-C (obtained from static light scattering experiments) implies presence of protein coat over the hydrophobic nanosurface. The results are supported by morphological changes observed through scanning electron microscopy (SEM). Accordingly, the X-ray diffraction pattern shows a change of crystallographic orientations of CdSnr in presence of Cyt-C.
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Affiliation(s)
- Shibsekhar Roy
- Department of Biochemistry, University of Calcutta, 35-Ballygunge Circular Road, Kolkata-700019, India
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Barr SA, Luijten E. Effective interactions in mixtures of silica microspheres and polystyrene nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:7152-5. [PMID: 16893209 DOI: 10.1021/la061291d] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We investigate the effect of small concentrations of highly charged nanoparticles on the stability of uncharged colloidal microspheres using large-scale simulations. Employing pair potentials that accurately represent mixtures of silica microspheres and polystyrene nanoparticles as studied experimentally, we are able to demonstrate that nanoparticle-induced stabilization can arise from a relatively weak van der Waals attraction between the colloids and nanoparticles. This demonstrates that the nanoparticle haloing mechanism for colloidal stabilization is of considerable generality and potentially can be applied to large classes of systems. The range of optimal nanoparticle concentrations can be tuned by controlling the attraction between colloids and nanoparticles.
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Affiliation(s)
- Stephen A Barr
- Department of Materials Science and Engineering and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
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