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Daware SV, Mondal R, Kothari M, Chowdhury A, Liu ACY, Prabhakar R, Kumaraswamy G. Synthesis and Characterization of Monolayer Colloidal Sheets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024. [PMID: 39288076 DOI: 10.1021/acs.langmuir.4c02262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/19/2024]
Abstract
Sheet-like colloidal assemblies represent model systems to investigate the structure and properties of two-dimensional materials. Here, we report a simple yet versatile method for the preparation of colloidal monolayer sheet-like assemblies that affords control over the size, crystalline order, flexibility, and defect density. The protocol that we report relies on self-assembly of colloids as a sessile drop of dispersion is evaporated on an oil-covered substrate. In this case, the contact line continually moves as the drop shrinks. Polyethyleneimine polymer-covered micrometer-sized colloidal particles are transported to the air-water interface and assemble to form a monolayer sheet as the drop dries. Cross-linking the polymer renders the colloidal assembly permanent. Interestingly, monodisperse colloidal particles form disordered assemblies when dried from low concentration dispersions, while polycrystalline ordered assemblies form at higher concentrations. We demonstrate that increasing the cross-linker to polymer ratio decreases the flexibility of the assembly. Introduction of different-sized colloidal particles in a sheet leads to increased disorder. Removal of sacrificial particles from the sheet allowed the introduction of "holes" in the sheets. Thus, these colloidal sheets are models for probing the effects of disorder, doping, and vacancies in two-dimensional systems.
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Affiliation(s)
- Santosh Vasant Daware
- Department of Chemical Engineering, Indian Institute of Bombay, Mumbai 400076, India
- IITB Monash Research Academy, IIT Bombay, Powai 400076, India
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton 3800, Australia
| | - Ranajit Mondal
- Department of Chemical Engineering, IIT Hyderabad, Kandi, Telangana 502284, India
| | - Mansi Kothari
- Department of Chemistry, Indian Institute of Bombay, Mumbai 400076, India
| | - Arindam Chowdhury
- Department of Chemistry, Indian Institute of Bombay, Mumbai 400076, India
| | - Amelia C Y Liu
- School of Physics and Astronomy, Monash University, Clayton 3800, Australia
| | - Ranganathan Prabhakar
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton 3800, Australia
| | - Guruswamy Kumaraswamy
- Department of Chemical Engineering, Indian Institute of Bombay, Mumbai 400076, India
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2
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Palvai S, Kpeglo D, Newham G, Peyman SA, Evans SD, Ong ZY. Free-Standing Hierarchically Porous Silica Nanoparticle Superstructures: Bridging the Nano- to Microscale for Tailorable Delivery of Small and Large Therapeutics. ACS APPLIED MATERIALS & INTERFACES 2024; 16:5568-5581. [PMID: 38270578 PMCID: PMC10859928 DOI: 10.1021/acsami.3c16463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 12/13/2023] [Accepted: 01/08/2024] [Indexed: 01/26/2024]
Abstract
Nanoscale colloidal self-assembly is an exciting approach to yield superstructures with properties distinct from those of individual nanoparticles. However, the bottom-up self-assembly of 3D nanoparticle superstructures typically requires extensive chemical functionalization, harsh conditions, and a long preparation time, which are undesirable for biomedical applications. Here, we report the directional freezing of porous silica nanoparticles (PSiNPs) as a simple and versatile technique to create anisotropic 3D superstructures with hierarchical porosity afforded by microporous PSiNPs and newly generated meso- and macropores between the PSiNPs. By varying the PSiNP building block size, the interparticle pore sizes can be readily tuned. The newly created hierarchical pores greatly augment the loading of a small molecule-anticancer drug, doxorubicin (Dox), and a large macromolecule, lysozyme (Lyz). Importantly, Dox loading into both the micro- and meso/macropores of the nanoparticle assemblies not only gave a pore size-dependent drug release but also significantly extended the drug release to 25 days compared to a much shorter 7 or 11 day drug release from Dox loaded into either the micro- or meso/macropores only. Moreover, a unique temporal drug release profile, with a higher and faster release of Lyz from the larger interparticle macropores than Dox from the smaller PSiNP micropores, was observed. Finally, the formulation of the Dox-loaded superstructures within a composite hydrogel induces prolonged growth inhibition in a 3D spheroid model of pancreatic ductal adenocarcinoma. This study presents a facile modular approach for the rapid assembly of drug-loaded superstructures in fully aqueous environments and demonstrates their potential as highly tailorable and sustained delivery systems for diverse therapeutics.
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Affiliation(s)
- Sandeep Palvai
- School
of Physics and Astronomy, University of
Leeds, Leeds LS2 9JT, U.K.
| | - Delanyo Kpeglo
- School
of Physics and Astronomy, University of
Leeds, Leeds LS2 9JT, U.K.
| | - George Newham
- School
of Physics and Astronomy, University of
Leeds, Leeds LS2 9JT, U.K.
| | - Sally A. Peyman
- School
of Physics and Astronomy, University of
Leeds, Leeds LS2 9JT, U.K.
- Leeds
Institute of Medical Research at St James, School of Medicine, University of Leeds, Leeds LS2 9JT, U.K.
| | - Stephen D. Evans
- School
of Physics and Astronomy, University of
Leeds, Leeds LS2 9JT, U.K.
| | - Zhan Yuin Ong
- School
of Physics and Astronomy, University of
Leeds, Leeds LS2 9JT, U.K.
- Leeds
Institute of Medical Research at St James, School of Medicine, University of Leeds, Leeds LS2 9JT, U.K.
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3
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Bhendale M, Indra A, Singh JK. Does freezing induce self-assembly of polymers? A molecular dynamics study. SOFT MATTER 2023; 19:7570-7579. [PMID: 37751160 DOI: 10.1039/d3sm00892d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
This work investigates the freezing-induced self-assembly (FISA) of polyvinyl alcohol (PVA) and PVA-like polymers using molecular dynamics simulations. In particular, the effect of the degree of supercooling, degree of polymerization, polymer type, and initial local concentration on the FISA was studied. It was found that the preeminent factor responsible for FISA is not the diffusion of the polymers away from the nucleating ice front, but the increase in the polymer's local concentration upon freezing of the solvent (water). At a higher degree of supercooling, the polymers are engulfed by the growing ice front, impeding their diffusion into the supercooled solution and finally inhibiting their self-assembly. Conversely, at a relatively lower degree of supercooling, the rate of diffusion of the polymers into the supercooled solution is higher, which increases their local concentration and results in FISA. FISA was also observed to depend on the polymer-solvent interactions. Strongly favorable solute-solvent interactions hinder the self-assembly, whereas unfavorable solute-solvent interactions promote the self-assembly. The polymer and aggregate morphology were investigated using the radius of gyration, end-to-end distance, and asphericity analysis. This study brings molecular insights into the quintessential factors governing self-assembly via freezing of the solvent, which is a novel self-assembly technique especially suitable for biomedical applications.
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Affiliation(s)
- Mangesh Bhendale
- Department of Chemical Engineering, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India.
| | - Aindrila Indra
- Department of Chemical Engineering, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India.
| | - Jayant K Singh
- Department of Chemical Engineering, Indian Institute of Technology, Kanpur, Uttar Pradesh 208016, India.
- Prescience Insilico Private Limited, 5th floor, Novel MSR Building, Marathalli, Bengaluru, Karnataka 560037, India
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Joukhdar H, Seifert A, Jüngst T, Groll J, Lord MS, Rnjak-Kovacina J. Ice Templating Soft Matter: Fundamental Principles and Fabrication Approaches to Tailor Pore Structure and Morphology and Their Biomedical Applications. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2100091. [PMID: 34236118 DOI: 10.1002/adma.202100091] [Citation(s) in RCA: 70] [Impact Index Per Article: 23.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Revised: 03/22/2021] [Indexed: 06/13/2023]
Abstract
Porous scaffolds are widely used in biomedical applications where pore size and morphology influence a range of biological processes, including mass transfer of solutes, cellular interactions and organization, immune responses, and tissue vascularization, as well as drug delivery from biomaterials. Ice templating, one of the most widely utilized techniques for the fabrication of porous materials, allows control over pore morphology by controlling ice formation in a suspension of solutes. By fine-tuning freezing and solute parameters, ice templating can be used to incorporate pores with tunable morphological features into a wide range of materials using a simple, accessible, and scalable process. While soft matter is widely ice templated for biomedical applications and includes commercial and clinical products, the principles underpinning its ice templating are not reviewed as well as their inorganic counterparts. This review describes and critically evaluates fundamental principles, fabrication and characterization approaches, and biomedical applications of ice templating in polymer-based biomaterials. It describes the utility of porous scaffolds in biomedical applications, highlighting biological mechanisms impacted by pore features, outlines the physical and thermodynamic mechanisms underpinning ice templating, describes common fabrication setups, critically evaluates complexities of ice templating specific to polymers, and discusses future directions in this field.
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Affiliation(s)
- Habib Joukhdar
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Annika Seifert
- Department for Functional Materials in Medicine and Dentistry, Institute of Functional Materials and Biofabrication, University of Würzburg and KeyLab Polymers for Medicine of the Bavarian Polymer Institute (BPI), Pleicherwall 2, 97070, Würzburg, Germany
| | - Tomasz Jüngst
- Department for Functional Materials in Medicine and Dentistry, Institute of Functional Materials and Biofabrication, University of Würzburg and KeyLab Polymers for Medicine of the Bavarian Polymer Institute (BPI), Pleicherwall 2, 97070, Würzburg, Germany
| | - Jürgen Groll
- Department for Functional Materials in Medicine and Dentistry, Institute of Functional Materials and Biofabrication, University of Würzburg and KeyLab Polymers for Medicine of the Bavarian Polymer Institute (BPI), Pleicherwall 2, 97070, Würzburg, Germany
| | - Megan S Lord
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW, 2052, Australia
| | - Jelena Rnjak-Kovacina
- Graduate School of Biomedical Engineering, University of New South Wales, Sydney, NSW, 2052, Australia
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5
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Biswas B, Misra M, Bisht AS, Kumar SK, Kumaraswamy G. Colloidal assembly by directional ice templating. SOFT MATTER 2021; 17:4098-4108. [PMID: 33729269 DOI: 10.1039/d0sm02057e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
We investigate directional ice templating of dilute aqueous colloidal particle dispersions and examine the nature of the assemblies that result. We coat micron-size polystyrene colloids with cross-linkable polymer (polyethyleneimine, PEI), add cross-linker, and subject this dispersion to unidirectional freezing. We work at sufficiently low colloid concentrations, such that the particles do not percolate on freezing. When the aqueous dispersion freezes, ice crystals force polymer-coated particles and cross-linker into close proximity. This results in the formation of cross-linked clusters of particles at ice crystal boundaries. We vary the particle volume fraction from φ ∼ 2.5 × 10-3 to φ ∼ 5.0 × 10-2 and observe that there is a transition from isolated single particles to increasingly large sized clusters. Most of the clusters formed under these conditions are either linear, two-particle wide chains, or sheet-like aggregates. The probability (Pn) of clusters containing n particles (n > 2) obeys a power law Pn ∼ n-η, where η strongly depends on the particle concentration in the dispersion, varying from 2.10 (for φ ∼ 5.0 × 10-2) to 3.03 (for φ ∼ 2.5 × 10-3). This change in η is qualitatively different from the case of isotropic freezing, where η is particle concentration-independent and depends only on the ice nucleation density. To understand the differences between isotropic and directional ice templating, we performed lattice simulations of a highly simplified model, where ice crystals grow at a constant rate to force clustering. We ignore hydrodynamic interactions and ice growth instabilities. Despite ignoring these experimental details, the simulations capture the experimental results, nearly quantitatively. As the ice crystals grow and the space available to the colloids "closes up" so that the particles cluster to form aggregates, crystallization protocol-induced differences in the geometry of these "closed up" spaces determine the scaling behaviour of Pn.
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Affiliation(s)
- Bipul Biswas
- Complex Fluid and Polymer Engineering, Polymer Science and Engineering, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune - 411008, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Mayank Misra
- Department of Chemical Engineering, Columbia University, 500 West 120th Street, New York 10027, USA.
| | - Anil Singh Bisht
- Complex Fluid and Polymer Engineering, Polymer Science and Engineering, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune - 411008, India. and Chemical Engineering, UPES-Dehradun, P.O. Bidholi Via-Prem Nagar, Dehradun-248007, India
| | - Sanat K Kumar
- Department of Chemical Engineering, Columbia University, 500 West 120th Street, New York 10027, USA.
| | - Guruswamy Kumaraswamy
- Complex Fluid and Polymer Engineering, Polymer Science and Engineering, CSIR-National Chemical Laboratory, Dr Homi Bhabha Road, Pune - 411008, India.
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6
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Mitra D, Chatterji A. Transient helix formation in charged semiflexible polymers without confinement effects. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 33:044001. [PMID: 32987379 DOI: 10.1088/1361-648x/abbc32] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 09/28/2020] [Indexed: 06/11/2023]
Abstract
Switching on generic interactions e.g. the Coulomb potential or other long ranged spherically symmetric repulsive interactions between monomers of bead-spring model of a semi-flexible polymer induce instabilities in a semiflexible polymer chain to form transient helical structures. Our proposed mechanism could explain the spontaneous emergence of helical order in stiff (bio-) polymers as a chain gets charged from a neutral state. But since the obtained helical structures dissolve away with time, hydrogen bonding (or other additional mechanisms), would be required to form stabilized helical structures as observed in nature (such as in biological macro-molecules). The emergence of the helix is independent of the molecular details of the monomer constituent. The key factors which control the emergence of the helical structure is the persistence length and the charge density. We have avoided using torsional potentials to obtain the transient helical structures. Moreover, we can drive the semiflexible polymer to form helices in a recurring manner by periodically increasing and decreasing the effective charge of the monomers. If the two polymer ends are tethered to two surfaces separated by a distance equal to the contour length of the polymeric chain, which could be in the range 10 nm-μ, the life time of the helical structures formed is increased.
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Affiliation(s)
- Debarshi Mitra
- Department of Physics, IISER-Pune, Dr Homi Bhaba Road, Pune-411008, India
| | - Apratim Chatterji
- Department of Physics, IISER-Pune, Dr Homi Bhaba Road, Pune-411008, India
- Center for Energy Science, IISER-Pune, Dr Homi Bhaba Road, Pune-411008, India
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7
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Ning X, Jimenez AM, Pribyl J, Li S, Benicewicz B, Kumar SK, Schadler LS. Nanoparticle Organization by Growing Polyethylene Crystal Fronts. ACS Macro Lett 2019; 8:1341-1346. [PMID: 35651145 DOI: 10.1021/acsmacrolett.9b00619] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
We investigate the crystallization-induced ordering of C18 grafted 14 nm diameter spherical silica nanoparticles (NPs) in a short chain (Mw = 4 kDa, ĐM ≈ 2.3) polyethylene and a commercial high-density polyethylene (Mw = 152 kDa, ĐM ≈ 3.2) matrix. For slow isothermal crystallization of the low molecular weight matrix, the NPs segregate into the interlamellar regions. This result establishes the generality of our earlier work on poly(ethylene oxide) based materials and suggests that crystallization can be used to control NP dispersion across different polymer classes. The incompatibility between the particles and the matrix in the Mw = 152 kDa results in a competition between filler organization and filler agglomeration. The mechanical properties improve due to the addition of NPs and are further enhanced by particle organization, even for the case of the macrophase-separated mixtures in the Mw = 152 kDa matrix. In contrast, dielectric behavior is strongly affected by the scale of NP organization, with the lower molecular weight matrix showing more significant increases in permittivity due to the local scale of NP ordering.
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Affiliation(s)
- Xin Ning
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
| | - Andrew M. Jimenez
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
| | - Julia Pribyl
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Shaohua Li
- Department of Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, United States
- Department of Electrical Engineering, Tsinghua University, Beijing 100084, China
| | - Brian Benicewicz
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Sanat K. Kumar
- Department of Chemical Engineering, Columbia University, New York, New York 10027, United States
| | - Linda S. Schadler
- Department of Mechanical Engineering, College of Engineering and Mathematical Sciences, University of Vermont, Burlington, Vermont 05405, United States
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8
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Mubeena S, Chatterji A. Hierarchical and synergistic self-assembly in composites of model wormlike micellar-polymers and nanoparticles results in nanostructures with diverse morphologies. THE EUROPEAN PHYSICAL JOURNAL. E, SOFT MATTER 2019; 42:50. [PMID: 31011936 DOI: 10.1140/epje/i2019-11811-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2018] [Accepted: 03/14/2019] [Indexed: 06/09/2023]
Abstract
Using Monte Carlo simulations, we investigate the self-assembly of model nanoparticles inside a matrix of model equilibrium polymers (or matrix of wormlike micelles) as a function of the polymeric matrix density and the excluded volume parameter between polymers and nanoparticles. In this paper, we show morphological transitions in the system architecture via synergistic self-assembly of nanoparticles and the equilibrium polymers. In a synergistic self-assembly, the resulting morphology of the system is a result of the interaction between the nanoparticles and the polymers and corresponding re-organization of both the assemblies. This is different from the polymer templating method. We report the morphological transition of nanoparticle aggregates from percolating network-like structures to non-percolating clusters as a result of the change in the excluded volume parameter between nanoparticles and polymeric chains. Corresponding to the change in the self-assembled structures of nanoparticles, the matrix of equilibrium polymers also simultaneously shows a transition from a dispersed state to a percolating network-like structure formed by the clusters of polymeric chains. We show that the shape anisotropy of the nanoparticle clusters formed is governed by the polymeric density resulting in rod-like, sheet-like or other anisotropic nanoclusters. It is also shown that the pore shape and the pore size of the porous network of nanoparticles can be changed by changing the minimum approaching distance between nanoparticles and polymers. We provide a theoretical understanding of why various nanostructures with very different morphologies are obtained.
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Affiliation(s)
- Shaikh Mubeena
- Department of Physics, IISER-Pune, Dr. Homi Bhabha Road, 411008, Pune, India
| | - Apratim Chatterji
- Department of Physics, IISER-Pune, Dr. Homi Bhabha Road, 411008, Pune, India.
- Center for Energy Science, IISER-Pune, Dr. Homi Bhabha Road, 411008, Pune, India.
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9
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Usgaonkar S, Deshmukh S, Biswas B, Karjule N, Yadav P, Nithyanandhan J, Kumaraswamy G. Light‐Triggered, Spatially Localized Chemistry by Photoinduced Electron Transfer. Angew Chem Int Ed Engl 2019; 58:2715-2719. [DOI: 10.1002/anie.201812700] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 01/03/2019] [Indexed: 01/29/2023]
Affiliation(s)
- Saurabh Usgaonkar
- Polymer Science and EngineeringInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
| | - Subrajeet Deshmukh
- Polymer Science and EngineeringInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
| | - Bipul Biswas
- Polymer Science and EngineeringInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR, New Delhi) India
| | - Neeta Karjule
- Physical and Materials ChemistryInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR, New Delhi) India
| | - Prashant Yadav
- Polymer Science and EngineeringInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR, New Delhi) India
| | - Jayaraj Nithyanandhan
- Physical and Materials ChemistryInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR, New Delhi) India
| | - Guruswamy Kumaraswamy
- Polymer Science and EngineeringInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR, New Delhi) India
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10
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Usgaonkar S, Deshmukh S, Biswas B, Karjule N, Yadav P, Nithyanandhan J, Kumaraswamy G. Light‐Triggered, Spatially Localized Chemistry by Photoinduced Electron Transfer. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201812700] [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)
- Saurabh Usgaonkar
- Polymer Science and EngineeringInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
| | - Subrajeet Deshmukh
- Polymer Science and EngineeringInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
| | - Bipul Biswas
- Polymer Science and EngineeringInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR, New Delhi) India
| | - Neeta Karjule
- Physical and Materials ChemistryInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR, New Delhi) India
| | - Prashant Yadav
- Polymer Science and EngineeringInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR, New Delhi) India
| | - Jayaraj Nithyanandhan
- Physical and Materials ChemistryInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR, New Delhi) India
| | - Guruswamy Kumaraswamy
- Polymer Science and EngineeringInstitution CSIR-National Chemical Laboratory CSIR-NCL Pune 411008 Maharashtra India
- Academy of Scientific and Innovative Research (AcSIR, New Delhi) India
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11
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Dores-Sousa JL, Fernández-Pumarega A, De Vos J, Lämmerhofer M, Desmet G, Eeltink S. Guidelines for tuning the macropore structure of monolithic columns for high-performance liquid chromatography. J Sep Sci 2018; 42:522-533. [DOI: 10.1002/jssc.201801092] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 10/31/2018] [Accepted: 10/31/2018] [Indexed: 11/12/2022]
Affiliation(s)
- José Luís Dores-Sousa
- Department of Chemical Engineering; Vrije Universiteit Brussel (VUB); Brussels Belgium
| | - Alejandro Fernández-Pumarega
- Departament de Química Analítica and Institut de Biomedicina (IBUB); Universitat de Barcelona, Facultat de Química; Barcelona Spain
| | - Jelle De Vos
- Department of Chemical Engineering; Vrije Universiteit Brussel (VUB); Brussels Belgium
| | - Michael Lämmerhofer
- Institute of Pharmaceutical Sciences, Pharmaceutical (Bio-)Analysis; University of Tübingen; Tübingen Germany
| | - Gert Desmet
- Department of Chemical Engineering; Vrije Universiteit Brussel (VUB); Brussels Belgium
| | - Sebastiaan Eeltink
- Department of Chemical Engineering; Vrije Universiteit Brussel (VUB); Brussels Belgium
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12
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Kumar SK, Ganesan V, Riggleman RA. Perspective: Outstanding theoretical questions in polymer-nanoparticle hybrids. J Chem Phys 2018; 147:020901. [PMID: 28711055 DOI: 10.1063/1.4990501] [Citation(s) in RCA: 109] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
This topical review discusses the theoretical progress made in the field of polymer nanocomposites, i.e., hybrid materials created by mixing (typically inorganic) nanoparticles (NPs) with organic polymers. It primarily focuses on the outstanding issues in this field and is structured around five separate topics: (i) the synthesis of functionalized nanoparticles; (ii) their phase behavior when mixed with a homopolymer matrix and their assembly into well-defined superstructures; (iii) the role of processing on the structures realized by these hybrid materials and the role of the mobilities of the different constituents; (iv) the role of external fields (electric, magnetic) in the active assembly of the NPs; and (v) the engineering properties that result and the factors that control them. While the most is known about topic (ii), we believe that significant progress needs to be made in the other four topics before the practical promise offered by these materials can be realized. This review delineates the most pressing issues on these topics and poses specific questions that we believe need to be addressed in the immediate future.
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Affiliation(s)
- Sanat K Kumar
- Department of Chemical Engineering, Columbia University, New York, New York 10025, USA
| | - Venkat Ganesan
- Department of Chemical Engineering, University of Texas, Austin, Texas 78712, USA
| | - Robert A Riggleman
- Department of Chemical and Biomolecular Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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13
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Biswas B, Manna RK, Laskar A, Kumar PBS, Adhikari R, Kumaraswamy G. Linking Catalyst-Coated Isotropic Colloids into "Active" Flexible Chains Enhances Their Diffusivity. ACS NANO 2017; 11:10025-10031. [PMID: 28898046 DOI: 10.1021/acsnano.7b04265] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Active colloids are not constrained by equilibrium: ballistic propulsion, superdiffusive behavior, or enhanced diffusivities have been reported for active Janus particles. At high concentrations, interactions between active colloids give rise to complex emergent behavior. Their collective dynamics result in the formation of several hundred particle-strong flocks or swarms. Here, we demonstrate significant diffusivity enhancement for colloidal objects that neither have a Janus architecture nor are at high concentrations. We employ uniformly catalyst-coated, viz. chemo-mechanically, isotropic colloids and link them into a chain to enforce proximity. Activity arises from hydrodynamic interactions between enchained colloidal beads due to reaction-induced phoretic flows catalyzed by platinum nanoparticles on the colloid surface. This results in diffusivity enhancements of up to 60% for individual chains in dilute solution. Chains with increasing flexibility exhibit higher diffusivities. Simulations accounting for hydrodynamic interactions between enchained colloids due to active phoretic flows accurately capture the experimental diffusivity. These simulations reveal that the enhancement in diffusivity can be attributed to the interplay between chain conformational fluctuations and activity. Our results show that activity can be used to systematically modulate the mobility of soft slender bodies.
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Affiliation(s)
- Bipul Biswas
- Complex Fluids and Polymer Engineering, Polymer Science and Engineering, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune 411008, India
| | - Raj Kumar Manna
- Department of Physics, Indian Institute of Technology Madras , Chennai 600036, India
| | - Abhrajit Laskar
- The Institute of Mathematical Sciences-Homi Bhabha National Institute (HBNI) , CIT Campus, Chennai 600113, India
| | - P B Sunil Kumar
- Department of Physics, Indian Institute of Technology Madras , Chennai 600036, India
- Department of Physics, Indian Institute of Technology Palakkad , Palakkad 678557, India
| | - Ronojoy Adhikari
- The Institute of Mathematical Sciences-Homi Bhabha National Institute (HBNI) , CIT Campus, Chennai 600113, India
- DAMTP, Centre for Mathematical Sciences, University of Cambridge , Wilberforce Road, Cambridge CB3 0WA, United Kingdom
| | - Guruswamy Kumaraswamy
- Complex Fluids and Polymer Engineering, Polymer Science and Engineering, CSIR-National Chemical Laboratory , Dr. Homi Bhabha Road, Pune 411008, India
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Wetterskog E, Castro A, Zeng L, Petronis S, Heinke D, Olsson E, Nilsson L, Gehrke N, Svedlindh P. Size and property bimodality in magnetic nanoparticle dispersions: single domain particles vs. strongly coupled nanoclusters. NANOSCALE 2017; 9:4227-4235. [PMID: 28290585 DOI: 10.1039/c7nr00023e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The widespread use of magnetic nanoparticles in the biotechnical sector puts new demands on fast and quantitative characterization techniques for nanoparticle dispersions. In this work, we report the use of asymmetric flow field-flow fractionation (AF4) and ferromagnetic resonance (FMR) to study the properties of a commercial magnetic nanoparticle dispersion. We demonstrate the effectiveness of both techniques when subjected to a dispersion with a bimodal size/magnetic property distribution: i.e., a small superparamagnetic fraction, and a larger blocked fraction of strongly coupled colloidal nanoclusters. We show that the oriented attachment of primary nanocrystals into colloidal nanoclusters drastically alters their static, dynamic, and magnetic resonance properties. Finally, we show how the FMR spectra are influenced by dynamical effects; agglomeration of the superparamagnetic fraction leads to reversible line-broadening; rotational alignment of the suspended nanoclusters results in shape-dependent resonance shifts. The AF4 and FMR measurements described herein are fast and simple, and therefore suitable for quality control procedures in commercial production of magnetic nanoparticles.
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Affiliation(s)
- E Wetterskog
- Solid State Physics, Department of Engineering Sciences, Ångström Laboratory, Uppsala University, Sweden.
| | - A Castro
- SOLVE Research and Consultancy AB, Lund, Sweden
| | - L Zeng
- Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden
| | - S Petronis
- SP Chemistry, Materials and Surfaces, SP Technical Research Institute of Sweden, Borås, Sweden
| | - D Heinke
- nanoPET Pharma GmbH, Berlin, Germany
| | - E Olsson
- Department of Applied Physics, Chalmers University of Technology, Göteborg, Sweden
| | - L Nilsson
- SOLVE Research and Consultancy AB, Lund, Sweden and Lund Centre for Field-Flow Fractionation, Department of Food Technology, Engineering and Nutrition, Lund University, Sweden
| | - N Gehrke
- nanoPET Pharma GmbH, Berlin, Germany
| | - P Svedlindh
- Solid State Physics, Department of Engineering Sciences, Ångström Laboratory, Uppsala University, Sweden.
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