1
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Ouyang Y, Liu Y, Fan Y, Zhou Y, Shi T. The impact of salinity on the cohesion process of quartz substracts: A molecular dynamics study. J Chem Phys 2024; 160:134503. [PMID: 38557844 DOI: 10.1063/5.0196707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 03/13/2024] [Indexed: 04/04/2024] Open
Abstract
The moisture with salt ions adsorbed on the mineral soil surface is crucial to the cohesion process when the media is exposed to marine or coastal environments. However, the impact of salinity on the cohesion of soils is not well studied at the nanoscale. In this study, the salinity effect was investigated by studying the wettability and capillary force of NaCl solutions on quartz substrates via a molecular dynamics-based approach. Besides, a new visualization method was proposed to measure the contact angle of liquid droplets from the aspect of nanoscale. The results indicated that salt ions can weaken the wettability of the liquid on the quartz surface and inhibit the capillary force. Compared with water, the liquid with a 10% NaCl solution can achieve a capillary force reduction of around 70%, resulting in a detrimental effect on the cohesion of soils. Overall, this study enhanced the understanding of the nanoscale salinity effect on the cohesion process and provided insights into the modification of the mechanical properties of soils from the aspect of nanoscale.
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Affiliation(s)
- Yubing Ouyang
- College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China
| | - Yanming Liu
- College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China
| | - Yujian Fan
- College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China
| | - Yang Zhou
- College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China
| | - Tao Shi
- College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China
- Zhejiang Key Laboratory of Civil Engineering Structures and Disaster Prevention and Mitigation Technology (Zhejiang University of Technology), Hangzhou 310023, China
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2
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Kim N, Kim Y, Yun JM, Jeong SK, Lee S, Lee BZ, Shim J. Surface Coating of Titanium Dioxide Nanoparticles with a Polymerizable Chelating Agent and Its Physicochemical Property. ACS OMEGA 2023; 8:18743-18750. [PMID: 37273586 PMCID: PMC10233674 DOI: 10.1021/acsomega.3c00734] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Accepted: 04/28/2023] [Indexed: 06/06/2023]
Abstract
Surface modification of inorganic nanoparticles is critical for the quality and performance of pigments, cosmetics, and composite materials. We covered the titanium dioxide nanoparticles' surface with 2-(acetoacetoxy) ethyl methacrylate, a polymerizable chelating agent. Through the in situ polymerization procedure, this molecule's β-ketoester moiety quickly coordinated with the metal atoms on titanium dioxide nanoparticles, and its methacrylate group formed homogeneous coating layers. This coating layer significantly reduced the photocatalytic activity of titanium dioxide nanoparticles and prevented their aggregation. This nanoparticle dispersion showed low viscosity up to the solid content of 60% (w/w) in the liquid dispersant. As a result, it increased the UV screening performance and dispersion stability. Additionally, this coating layer widened the absorption spectrum of titanium dioxide and could change the color of nanoparticles from pale yellow to brown. It can also be helpful for cosmetic applications.
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Affiliation(s)
- NaRi Kim
- Department
of Chemistry, Dongduk Women’s University, Seoul 02748, Korea
| | - Yerin Kim
- Department
of Chemistry, Dongduk Women’s University, Seoul 02748, Korea
| | - Je-Moon Yun
- Division
of Advanced Materials Engineering, Dong-Eui
University, Busan 47340, Korea
| | | | - Sulhae Lee
- R &
D Team, CHEMLAND, Gunpo 15850, Korea
| | | | - Jongwon Shim
- Department
of Chemistry, Dongduk Women’s University, Seoul 02748, Korea
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3
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Kamphorst R, Wu K, Salameh S, Meesters GMH, van Ommen JR. On the fluidization of cohesive powders: Differences and similarities between micro‐ and nano‐sized particle gas–solid fluidization. CAN J CHEM ENG 2022. [DOI: 10.1002/cjce.24615] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- R. Kamphorst
- Department of Chemical Engineering Technical University Delft The Netherlands
| | - K. Wu
- Department of Chemical Engineering Technical University Delft The Netherlands
| | - S. Salameh
- Department of Chemical Engineering Fachhochschule Münster Germany
| | - G. M. H. Meesters
- Department of Chemical Engineering Technical University Delft The Netherlands
| | - J. R. van Ommen
- Department of Chemical Engineering Technical University Delft The Netherlands
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4
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Ouyang Y, Chen S, Sagoe-Crentsil K, Duan W. Capillary bridges between unsaturated nano-mineral particles: a molecular dynamics study. Phys Chem Chem Phys 2022; 24:8398-8407. [PMID: 35332902 DOI: 10.1039/d1cp05041a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Capillary bridges play an important role in the process of cohesion, which is crucial for wet granular media, and engineering of pharmaceuticals and food processing. However, the understanding of capillary bridges at the nanoscale remains unclear because the mechanical performance of nanoscale capillary bridges cannot be fully captured and explained by classical capillary theory. We applied a novel molecular dynamic simulation to investigate the dynamic formation process of nanoscale capillary bridges between quartz asperities. In comparison with classical capillary theory, our results suggested that the application of the toroidal approximation and gorge method will break down at the scale of 1 nm. Below this threshold, a pronounced oscillation in the adhesive force was observed due to inconsistent distribution of water molecules in the capillary bridges. Moreover, we found a non-linear correlation between the adhesive force and the saturation degree. Different from the cohesive stress of sandy soil as a function of saturation degree, we identified an optimal saturation range of 0.5-0.7 instead of 0.2-0.9 for the sandy soil. Our findings enhance the understanding of capillary bridges and provide new insights into the capillary force between particles in the fields of geotechnical engineering, food-process engineering, the pharmaceutical industry and nanotechnology.
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Affiliation(s)
- Yubing Ouyang
- Department of Civil Engineering, Monash University, Clayton 3168, VIC, Australia
| | - Shujian Chen
- School of Civil Engineering, The University of Queensland, Brisbane 4072, Qld, Australia.
| | - Kwesi Sagoe-Crentsil
- Department of Civil Engineering, Monash University, Clayton 3168, VIC, Australia
| | - Wenhui Duan
- Department of Civil Engineering, Monash University, Clayton 3168, VIC, Australia
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5
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Green synthesis of nano-titania (TiO2 NPs) utilizing aqueous Eucalyptus globulus leaf extract: applications in the synthesis of 4H-pyran derivatives. RESEARCH ON CHEMICAL INTERMEDIATES 2021. [DOI: 10.1007/s11164-018-03720-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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La Zara D, Sun F, Zhang F, Franek F, Balogh Sivars K, Horndahl J, Bates S, Brännström M, Ewing P, Quayle MJ, Petersson G, Folestad S, van Ommen JR. Controlled Pulmonary Delivery of Carrier-Free Budesonide Dry Powder by Atomic Layer Deposition. ACS NANO 2021; 15:6684-6698. [PMID: 33769805 PMCID: PMC8155342 DOI: 10.1021/acsnano.0c10040] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2020] [Accepted: 03/22/2021] [Indexed: 06/12/2023]
Abstract
Ideal controlled pulmonary drug delivery systems provide sustained release by retarding lung clearance mechanisms and efficient lung deposition to maintain therapeutic concentrations over prolonged time. Here, we use atomic layer deposition (ALD) to simultaneously tailor the release and aerosolization properties of inhaled drug particles without the need for lactose carrier. In particular, we deposit uniform nanoscale oxide ceramic films, such as Al2O3, TiO2, and SiO2, on micronized budesonide particles, a common active pharmaceutical ingredient for the treatment of respiratory diseases. In vitro dissolution and ex vivo isolated perfused rat lung tests demonstrate dramatically slowed release with increasing nanofilm thickness, regardless of the nature of the material. Ex situ transmission electron microscopy at various stages during dissolution unravels mostly intact nanofilms, suggesting that the release mechanism mainly involves the transport of dissolution media through the ALD films. Furthermore, in vitro aerosolization testing by fast screening impactor shows a ∼2-fold increase in fine particle fraction (FPF) for each ALD-coated budesonide formulation after 10 ALD process cycles, also applying very low patient inspiratory pressures. The higher FPFs after the ALD process are attributed to the reduction in the interparticle force arising from the ceramic surfaces, as evidenced by atomic force microscopy measurements. Finally, cell viability, cytokine release, and tissue morphology analyses verify a safe and efficacious use of ALD-coated budesonide particles at the cellular level. Therefore, surface nanoengineering by ALD is highly promising in providing the next generation of inhaled formulations with tailored characteristics of drug release and lung deposition, thereby enhancing controlled pulmonary delivery opportunities.
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Affiliation(s)
- Damiano La Zara
- Department
of Chemical Engineering, Delft University
of Technology, Van der Maasweg 9, Delft, 2629HZ, The Netherlands
| | - Feilong Sun
- Department
of Chemical Engineering, Delft University
of Technology, Van der Maasweg 9, Delft, 2629HZ, The Netherlands
| | - Fuweng Zhang
- Department
of Chemical Engineering, Delft University
of Technology, Van der Maasweg 9, Delft, 2629HZ, The Netherlands
| | - Frans Franek
- Advanced
Drug Delivery, Pharmaceutical Sciences, R&D, AstraZeneca, Gothenburg, Sweden
| | - Kinga Balogh Sivars
- Clinical
Testing and Precision Medicine, Global Procurement, Operations, AstraZeneca, Gothenburg, Sweden
| | - Jenny Horndahl
- Bioscience
COPD/IPF, Research and Early Development, Respiratory & Immunology, BioPharmaceuticals R&D, AstraZeneca, Gothenburg, Sweden
| | - Stephanie Bates
- Functional
and Mechanistic Safety, Clinical Pharmacology
and Safety Sciences, R&D, AstraZeneca, Cambridge U.K.
| | - Marie Brännström
- Drug
Metabolism and Pharmacokinetics, Research and Early Development, Respiratory & Immunology, BioPharmaceuticals R&D,
AstraZeneca, Gothenburg, Sweden
| | - Pär Ewing
- Drug
Metabolism and Pharmacokinetics, Research and Early Development, Respiratory & Immunology, BioPharmaceuticals R&D,
AstraZeneca, Gothenburg, Sweden
| | - Michael J. Quayle
- New Modalities
and Parenteral Development, Pharmaceutical Technology & Development, Operations, AstraZeneca, Gothenburg, Sweden
| | - Gunilla Petersson
- Innovation
Strategy and External Liaison, Pharmaceutical Technology & Development, Operations, AstraZeneca, Gothenburg, Sweden
| | - Staffan Folestad
- Innovation
Strategy and External Liaison, Pharmaceutical Technology & Development, Operations, AstraZeneca, Gothenburg, Sweden
| | - J. Ruud van Ommen
- Department
of Chemical Engineering, Delft University
of Technology, Van der Maasweg 9, Delft, 2629HZ, The Netherlands
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7
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8
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Ghosh S, Chen X, Li C, Olson BA, Hogan CJ. Fragmentation and film growth in supersonic nanoaggregate aerosol deposition. AIChE J 2019. [DOI: 10.1002/aic.16874] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Souvik Ghosh
- Department of Mechanical Engineering University of Minnesota Minneapolis Minnesota
| | - Xiaoshuang Chen
- Department of Mechanical Engineering University of Minnesota Minneapolis Minnesota
| | - Chenxi Li
- Department of Mechanical Engineering University of Minnesota Minneapolis Minnesota
| | - Bernard A. Olson
- Department of Mechanical Engineering University of Minnesota Minneapolis Minnesota
| | - Christopher J. Hogan
- Department of Mechanical Engineering University of Minnesota Minneapolis Minnesota
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9
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Kovalchuk NM, Johnson D, Sobolev V, Hilal N, Starov V. Interactions between nanoparticles in nanosuspension. Adv Colloid Interface Sci 2019; 272:102020. [PMID: 31466000 DOI: 10.1016/j.cis.2019.102020] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2019] [Revised: 08/09/2019] [Accepted: 08/14/2019] [Indexed: 12/19/2022]
Abstract
Nanoparticles are particles with a characteristic dimension below 100 nm. The properties of nanoparticles differ substantially from those of "big" colloidal particles (size bigger than 1 μm) because radius of surface forces, which is around 100 nm, is greater than or comparable with the nanoparticles size. The latter means that each nanoparticle could be completely covered by the surface forces of the neighbouring particles at small enough separation. It also means that the well-known Derjaguin approximation cannot be applied directly and some modifications are required. Pairwise interaction between nanoparticles can be used only at an extremely low volume fraction of nanoparticles (below some critical volume fraction, which is ~0.02%), and above this concentration a new theory based on many-particle interactions should be applied, which is yet to be developed. Some recent progress in the area of interaction between nanoparticles is reviewed and the properties of nanosuspensions based on interaction between nanoparticles are described. The authors have not attempted to cover all available literature in the area but instead have tried to underline the fundamental problems in the area which need to be addressed.
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Affiliation(s)
| | | | - V Sobolev
- A.N.Frumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences, Russia
| | - N Hilal
- Swansea University, UK; NYUAD Water Research Centre, New York University Abdu Dhabi, Abu Dhabi, United Arab Emirates
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10
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Baric V, Ciacchi LC, Mädler L. Compaction-induced restructuring of aggregated nanoparticle films using the discrete element method. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2018.10.038] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Kelesidis GA, Furrer FM, Wegner K, Pratsinis SE. Impact of Humidity on Silica Nanoparticle Agglomerate Morphology and Size Distribution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:8532-8541. [PMID: 29940739 DOI: 10.1021/acs.langmuir.8b00576] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The effect of humidity on flame-made metal oxide agglomerate morphology and size distribution is investigated, for the first time to our knowledge, and compared to that on soot, which has been widely studied. Understanding the impact of humidity on such characteristics is essential for storage, handling, processing, and eventual performance of nanomaterials. More specifically, broadly used agglomerates of flame-made silica nanoparticles are humidified at various saturation ratios, S = 0.2-1.5, and dried before characterization with a differential mobility analyzer (DMA), an aerosol particle mass (APM) analyzer, and transmission electron microscopy. At high humidity, the constituent single and/or aggregated (chemically bonded) primary particles (PPs) rearrange to balance the capillary forces induced by condensation-evaporation of liquid bridges between PPs. Larger agglomerates restructure more than smaller ones, narrowing their mobility size distribution. After humidification at S = 1.5 and drying, agglomerates collapse into compact structures that follow a fractal scaling law with mass-mobility exponent Dfm = 3.02 ± 0.11 and prefactor km = 0.27 ± 0.07. This critical S = 1.5 for silica agglomerates is larger than the 1.26 obtained for soot because of the hydrophilic surface of silica that delays water evaporation. The relative effective density, ρeff/ρ, of collapsed agglomerates becomes invariant of mobility diameter, dm, similar to that of fluidized and spray-dried granules. The average silica ρeff/ρ = 0.28 ± 0.02 is smaller than the 0.36 ± 0.04 measured for the humidified-dried soot because of the larger size of silica aggregates, dm/ dp, and number of constituent primary particles, np, of diameter dp. This is verified by tandem-DMA (TDMA) measurements, yielding maximum dm = 3 dp or 5 dp and np = 13 or 36 for the soot or silica aggregates studied here, in good agreement with those reported from microscopy and high-pressure agglomerate dispersion. A scaling law relating the initial dm,o to dm, Dfm, and km after condensation-drying is developed. The mass-mobility relationship of collapsed silica and soot agglomerates obtained by combining this law with fast TDMA measurements is in excellent agreement with that measured by the direct, but tedious, DMA-APM analysis.
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Affiliation(s)
- Georgios A Kelesidis
- Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering , ETH Zürich , Sonneggstrasse 3 , CH-8092 Zürich , Switzerland
| | - Florian M Furrer
- Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering , ETH Zürich , Sonneggstrasse 3 , CH-8092 Zürich , Switzerland
| | - Karsten Wegner
- Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering , ETH Zürich , Sonneggstrasse 3 , CH-8092 Zürich , Switzerland
| | - Sotiris E Pratsinis
- Particle Technology Laboratory, Institute of Process Engineering, Department of Mechanical and Process Engineering , ETH Zürich , Sonneggstrasse 3 , CH-8092 Zürich , Switzerland
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12
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Jiang X, Li J, Lee V, Jaeger HM, Heinonen OG, de Pablo JJ. Evolutionary strategy for inverse charge measurements of dielectric particles. J Chem Phys 2018; 148:234302. [DOI: 10.1063/1.5027435] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Xikai Jiang
- Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA
| | - Jiyuan Li
- Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA
| | - Victor Lee
- James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
| | - Heinrich M. Jaeger
- James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
| | - Olle G. Heinonen
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
- Northwestern-Argonne Institute for Science and Engineering, Evanston, Illinois 60208, USA
| | - Juan J. de Pablo
- Institute for Molecular Engineering, University of Chicago, Chicago, Illinois 60637, USA
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, USA
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13
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Girard A, Ramade J, Margueritat J, Machon D, Saviot L, Demoisson F, Mermet A. Contact laws between nanoparticles: the elasticity of a nanopowder. NANOSCALE 2018; 10:2154-2161. [PMID: 29327007 DOI: 10.1039/c7nr07540e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Studies of the mechanical contact between nanometer-scale particles provide fundamental insights into the mechanical properties of materials and the validity of contact laws at the nanoscale which are still under debate for contact surfaces approaching atomic dimensions. Using in situ Brillouin light scattering under high pressure, we show that effective medium theories successfully predict the macroscopic sound velocities in nanopowders if one takes into account the cementation of the contacts Our measurements suggest the relevance of the continuum approach and effective medium theories to describe the contact between nanoparticles of diameters as small as 4 nm, i.e. with radii of contact of a few angstroms. In particular, we demonstrate that the mechanical properties of nanopowders strongly depend on the surface state of the nanoparticles. The presence of molecular adsorbates modifies significantly the contact laws.
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Affiliation(s)
- Adrien Girard
- Institut Lumière Matière, Université de Lyon, Université Claude Bernard Lyon 1, UMR CNRS 5306, 69622 Villeurbanne, France.
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14
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Electrostatic assembly of zwitterionic and amphiphilic supraparticles. J Colloid Interface Sci 2017; 501:256-266. [DOI: 10.1016/j.jcis.2017.04.076] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 04/21/2017] [Accepted: 04/24/2017] [Indexed: 12/12/2022]
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15
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Valdesueiro D, Hettinga H, Drijfhout JP, Lips P, Meesters GM, Kreutzer MT, Ruud van Ommen J. Tuning roughness and gloss of powder coating paint by encapsulating the coating particles with thin Al 2 O 3 films. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.05.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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16
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17
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Fabre A, Salameh S, Kreutzer MT, van Ommen JR. Modeling the size distribution in a fluidized bed of nanopowder. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.02.056] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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18
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Salameh S, van der Veen MA, Kappl M, van Ommen JR. Contact Forces between Single Metal Oxide Nanoparticles in Gas-Phase Applications and Processes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:2477-2484. [PMID: 28186771 PMCID: PMC5352976 DOI: 10.1021/acs.langmuir.6b02982] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
In this work we present a comprehensive experimental study to determine the contact forces between individual metal oxide nanoparticles in the gas-phase using atomic force microscopy. In addition, we determined the amount of physisorbed water for each type of particle surface. By comparing our results with mathematical models of the interaction forces, we could demonstrate that classical continuum models of van der Waals and capillary forces alone cannot sufficiently describe the experimental findings. Rather, the discrete nature of the molecules has to be considered, which leads to ordering at the interface and the occurrence of solvation forces. We demonstrate that inclusion of solvation forces in the model leads to quantitative agreement with experimental data and that tuning of the molecular order by addition of isopropanol vapor allows us to control the interaction forces between the nanoparticles.
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Affiliation(s)
- Samir Salameh
- Delft University of Technology, Department of Chemical
Engineering, Product and Process Engineering, and Department of Chemical Engineering,
Catalysis Engineering, 2628BL Delft, Netherlands
- E-mail:
| | - Monique A. van der Veen
- Delft University of Technology, Department of Chemical
Engineering, Product and Process Engineering, and Department of Chemical Engineering,
Catalysis Engineering, 2628BL Delft, Netherlands
| | - Michael Kappl
- Max
Planck Institute for Polymer Research, Department
of Physics at Interfaces, 55128 Mainz, Germany
| | - J. Ruud van Ommen
- Delft University of Technology, Department of Chemical
Engineering, Product and Process Engineering, and Department of Chemical Engineering,
Catalysis Engineering, 2628BL Delft, Netherlands
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19
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Fabre A, Salameh S, Ciacchi LC, Kreutzer MT, van Ommen JR. Contact mechanics of highly porous oxide nanoparticle agglomerates. JOURNAL OF NANOPARTICLE RESEARCH : AN INTERDISCIPLINARY FORUM FOR NANOSCALE SCIENCE AND TECHNOLOGY 2016; 18:200. [PMID: 27478406 PMCID: PMC4949302 DOI: 10.1007/s11051-016-3500-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 07/04/2016] [Indexed: 05/28/2023]
Abstract
Efficient nanopowder processing requires knowledge of the powder's mechanical properties. Due to the large surface area to volume ratio, nanoparticles experience relatively strong attractive interactions, leading to the formation of micron-size porous structures called agglomerates. Significant effort has been directed towards the development of models and experimental procedures to estimate the elasticity of porous objects such as nanoparticle agglomerates; however, none of the existing models has been validated for solid fractions below 0.1. Here, we measure the elasticity of titania (TiO[Formula: see text], 22 nm), alumina (Al[Formula: see text]O[Formula: see text], 8 nm), and silica (SiO[Formula: see text], 16 nm) nanopowder agglomerates by Atomic Force Microscopy, using a 3.75 [Formula: see text]m glass colloid for the stress-strain experiments. Three sample preparations with varying degree of powder manipulation are assessed. The measured Young's moduli are in the same order of magnitude as those predicted by the model of Kendall et al., thus validating it for the estimation of the Young's modulus of structures with porosity above 90 %.
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Affiliation(s)
- Andrea Fabre
- />Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - Samir Salameh
- />Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | | | - Michiel T. Kreutzer
- />Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
| | - J. Ruud van Ommen
- />Department of Chemical Engineering, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands
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20
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Physisorption of α-chymotrypsin on SiO2 and TiO2: A comparative study via experiments and molecular dynamics simulations. Biointerphases 2016; 11:011007. [DOI: 10.1116/1.4940701] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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21
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22
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Laube J, Salameh S, Kappl M, Mädler L, Colombi Ciacchi L. Contact Forces between TiO2 Nanoparticles Governed by an Interplay of Adsorbed Water Layers and Roughness. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:11288-95. [PMID: 26414448 DOI: 10.1021/acs.langmuir.5b02989] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Interparticle forces govern the mechanical behavior of granular matter and direct the hierarchical assembling of nanoparticles into supramolecular structures. Understanding how these forces change under different ambient conditions would directly benefit industrial-scale nanoparticle processing units such as filtering and fluidization. Here we rationalize and quantify the contributions of dispersion, capillary, and solvation forces between hydrophilic TiO2 nanoparticles with sub-10 nm diameter and show that the humidity dependence of the interparticle forces is governed by a delicate interplay between the structure of adsorbed water layers and the surface roughness. All-atom molecular dynamics modeling supported by force-spectroscopy experiments reveals an unexpected decrease in the contact forces at increasing humidity for nearly spherical particles, while the forces between rough particles are insensitive to strong humidity changes. Our results also frame the limits of applicability of discrete solvation and continuum capillary theories in a regime where interparticle forces are dominated by the molecular nature of surface adsorbates.
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Affiliation(s)
| | | | - Michael Kappl
- Max Planck Institute for Polymer Research , 55128 Mainz, Germany
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23
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Valdesueiro D, Meesters GMH, Kreutzer MT, van Ommen JR. Gas-Phase Deposition of Ultrathin Aluminium Oxide Films on Nanoparticles at Ambient Conditions. MATERIALS 2015; 8:1249-1263. [PMID: 28788000 PMCID: PMC5455438 DOI: 10.3390/ma8031249] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 02/26/2015] [Accepted: 03/09/2015] [Indexed: 12/04/2022]
Abstract
We have deposited aluminium oxide films by atomic layer deposition on titanium oxide nanoparticles in a fluidized bed reactor at 27 ± 3 °C and atmospheric pressure. Working at room temperature allows the coating of heat-sensitive materials, while working at atmospheric pressure would simplify the scale-up of this process. We performed 4, 7 and 15 cycles by dosing a predefined amount of precursors, i.e., trimethyl aluminium and water. We obtained a growth per cycle of 0.14–0.15 nm determined by transmission electron microscopy (TEM), similar to atomic layer deposition (ALD) experiments at a few millibars and ~180 °C. We also increased the amount of precursors dosed by a factor of 2, 4 and 6 compared to the base case, maintaining the same purging time. The growth per cycle (GPC) increased, although not linearly, with the dosing time. In addition, we performed an experiment at 170 °C and 1 bar using the dosing times increased by factor 6, and obtained a growth per cycle of 0.16 nm. These results were verified with elemental analysis, which showed a good agreement with the results from TEM pictures. Thermal gravimetric analysis (TGA) showed a negligible amount of unreacted molecules inside the alumina films. Overall, the dosage of the precursors is crucial to control precisely the growth of the alumina films at atmospheric pressure and room temperature. Dosing excess precursor induces a chemical vapour deposition type of growth due to the physisorption of molecules on the particles, but this can be avoided by working at high temperatures.
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Affiliation(s)
- David Valdesueiro
- Department of Chemical Engineering, Delft University of Technology, 2628 BL Delft, The Netherlands.
| | - Gabrie M H Meesters
- Department of Chemical Engineering, Delft University of Technology, 2628 BL Delft, The Netherlands.
| | - Michiel T Kreutzer
- Department of Chemical Engineering, Delft University of Technology, 2628 BL Delft, The Netherlands.
| | - J Ruud van Ommen
- Department of Chemical Engineering, Delft University of Technology, 2628 BL Delft, The Netherlands.
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de Martín L, Bouwman WG, van Ommen JR. Multidimensional nature of fluidized nanoparticle agglomerates. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:12696-702. [PMID: 25313446 DOI: 10.1021/la502987e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
We show that fluidized nanoparticle agglomerates are hierarchical fractal structures with three fractal dimensions: one characterizing sintered aggregates formed during nanoparticle synthesis, one that is also found in stored agglomerates and represents unbroken agglomerates, and one describing the large agglomerates broken during fluidization. This has been possible by using spin-echo small-angle neutron scattering-a relatively novel technique that, for the first time, allowed to characterize in situ the structure of fluidized nanoparticle agglomerates from 21 nm to ∼20 μm. The results show that serial agglomeration mechanisms in the gas phase can generate nanoparticle clusters with different fractal dimensions, contradicting the common approach that considers fluidized nanoparticle agglomerates as single fractals, in analogy to the agglomerates formed by micron-sized particles. This work has important implications for the fluidization field but also has a wider impact. Current studies deal with the formation and properties of clusters where the building blocks are particles and the structure can be characterized by only one fractal dimension. However, fluidized nanoparticle agglomerates are low-dimensional clusters formed by higher-dimensional clusters that are formed by low-dimensional clusters. This multifractality demands a new type of multiscale model able to capture the interplay between different scales.
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Affiliation(s)
- Lilian de Martín
- Department of Chemical Engineering and ‡Department of Radiation, Science and Technology, Delft University of Technology , Delft, The Netherlands
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Salameh S, Scholz R, Seo JW, Mädler L. Contact behavior of size fractionated TiO2 nanoparticle agglomerates and aggregates. POWDER TECHNOL 2014. [DOI: 10.1016/j.powtec.2014.02.042] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kunze C, Giner I, Torun B, Grundmeier G. Influence of the surface chemistry on TiO2 – TiO2 nanocontact forces as measured by an UHV–AFM. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.02.036] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Dörmann M, Schmid HJ. Simulation of capillary bridges between nanoscale particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:1055-1062. [PMID: 24417253 DOI: 10.1021/la404409k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Capillary forces are very important as they exceed in general other adhesion forces. But at the same time the exact calculation of these forces is very complex, so often assumptions and approximations are used. Previous research was done with regard to micrometer sized particles, but the behavior of nanoscale particles is different. Hence, the results for micrometer sized particles cannot be directly transferred when considering nanoscale particles. Therefore, a simulation method was developed to calculate numerically the shape of a rotationally symmetrical capillary bridge between two spherical particles or a particle and a plate. The capillary bridge in the gap between the particles is formed due to capillary condensation and is in thermodynamic equilibrium with the gas phase. Hence the Kelvin equation and the Young-Laplace equation can be used to calculate the profile of the capillary bridge, depending on the relative humidity of the surrounding air. The bridge profile consists of several elements that are determined consecutively and interpolated linearly. After the shape is determined, the volume and force, divided into capillary pressure force and surface tension force, can be calculated. The validation of this numerical model will be shown by comparison with several different analytical calculations for micrometer-sized particles. Furthermore, it is demonstrated that two often used approximations, (1) the toroidal approximation and (2) the use of an effective radius, cannot be used for nanoscale particles without remarkable mistake. It will be discussed how the capillary force and its components depend on different parameters, like particle size, relative humidity, contact angle, and distance, respectively. The rupture of a capillary bridge due to particle separation will also be presented.
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Affiliation(s)
- Michael Dörmann
- Particle Technology Group, University of Paderborn , Pohlweg 55, 33098 Paderborn, Germany
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Pyrgiotakis G, Blattmann CO, Pratsinis S, Demokritou P. Nanoparticle-nanoparticle interactions in biological media by atomic force microscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:11385-95. [PMID: 23978039 PMCID: PMC4438084 DOI: 10.1021/la4019585] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Particle-particle interactions in physiological media are important determinants for nanoparticle fate and transport. Herein, such interactions are assessed by a novel atomic force microscopy (AFM)-based platform. Industry-relevant CeO2, Fe2O3, and SiO2 nanoparticles of various diameters were made by the flame spray pyrolysis (FSP)-based Harvard Versatile Engineering Nanomaterials Generation System (Harvard VENGES). The nanoparticles were fully characterized structurally and morphologically, and their properties in water and biological media were also assessed. The nanoparticles were attached on AFM tips and deposited on Si substrates to measure particle-particle interactions. The corresponding force was measured in air, water, and biological media that are widely used in toxicological studies. The presented AFM-based approach can be used to assess the agglomeration potential of nanoparticles in physiological fluids. The agglomeration potential of CeO2 nanoparticles in water and RPMI 1640 (Roswell Park Memorial Institute formulation 1640) was inversely proportional to their primary particle (PP) diameter, but for Fe2O3 nanoparticles, that potential is independent of PP diameter in these media. Moreover, in RPMI+10% Fetal Bovine Serum (FBS), the corona thickness and dispersibility of the CeO2 are independent of PP diameter, while for Fe2O3, the corona thickness and dispersibility were inversely proportional to PP diameter. The present method can be combined with dynamic light scattering (DLS), proteomics, and computer simulations to understand the nanobio interactions, with emphasis on the agglomeration potential of nanoparticles and their transport in physiological media.
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Affiliation(s)
- Georgios Pyrgiotakis
- Center for Nanotechnology and Nanotoxicology at Harvard School of Public Health, Harvard University , 665 Huntington Avenue, Boston, Massachusetts 02115, United States
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Siedl N, Gügel P, Diwald O. Synthesis and aggregation of In2O3 nanoparticles: impact of process parameters on stoichiometry changes and optical properties. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:6077-6083. [PMID: 23581514 DOI: 10.1021/la400750d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Metal-organic chemical vapor synthesis provides agglomerated In2O3 nanoparticles with a low abundance of particle-particle interfaces. Via exposure to bulk water and subsequent dehydration treatment these powders can be transformed into networks of aggregated nanoparticles. Two major effects arise from the associated emergence of particle-particle interfaces: an enhanced susceptibility to annealing induced n-type doping and a significant red-shift of the optical absorption threshold by 0.2 eV. On the basis of control experiments with pure water, we further explored the impact of the environmental gas atmosphere during annealing on the integral ensemble properties. We found that residual water vapor promotes the mutual attraction of particles, facilitates their condensation, and generates particle-particle interfaces. This work may prove to be of great value for the reproducible production and formulation of percolating metal oxide nanoparticle networks with high control over particle aggregation state, on the one hand, and n-type conductivity as well as optical properties, on the other.
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Affiliation(s)
- Nicolas Siedl
- Institute of Particle Technology, Friedrich-Alexander-University Erlangen-Nürnberg, Erlangen, Germany
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Schopf SO, Salameh S, Mädler L. Transfer of highly porous nanoparticle layers to various substrates through mechanical compression. NANOSCALE 2013; 5:3764-72. [PMID: 23532446 DOI: 10.1039/c3nr34235b] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A new two-step layer transfer process is introduced that is capable of fabricating mechanically stabilized highly porous nanoparticle layers on various substrates. In a first step titanium dioxide nanoparticles were synthesized with Flame-Spray-Pyrolysis and accumulated on a filter paper in the gas phase. In a second step this highly porous filter cake is subsequently transferred to a final substrate via low pressure lamination at room temperature. This leads to mechanical restructuring and stabilization of the porous layer. Pore size analysis indicates homogenization of the layers through rearrangement of the aggregates inside the layers that increases with applied pressure. Additionally, the Young's moduli of the layers were quantified through Colloidal-Probe-Technique indentation measurements with an Atomic-Force-Microscope. The highest lamination pressure of 2.5 MPa resulted in triplication of the Young's modulus. The results show that our novel two-step layer transfer process leads to mechanically stabilized layers that preserve their high porosity. Through the decoupling of the high temperature nanoparticle synthesis and the final substrate the process also enables the possibility to apply temperature sensitive substrates such as polypropylene foil.
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Affiliation(s)
- Sven O Schopf
- Foundation Institute of Materials Science (IWT), Department of Production Engineering, University of Bremen, Germany
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Yu J, Wei W, Menyo MS, Masic A, Waite JH, Israelachvili JN. Adhesion of mussel foot protein-3 to TiO2 surfaces: the effect of pH. Biomacromolecules 2013; 14:1072-7. [PMID: 23452271 DOI: 10.1021/bm301908y] [Citation(s) in RCA: 182] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The underwater adhesion of marine mussels relies on mussel foot proteins (mfps) rich in the catecholic amino acid 3,4-dihydroxyphenylalanine (Dopa). As a side chain, Dopa is capable of strong bidentate interactions with a variety of surfaces, including many minerals and metal oxides. Titanium is among the most widely used medical implant material and quickly forms a TiO2 passivation layer under physiological conditions. Understanding the binding mechanism of Dopa to TiO2 surfaces is therefore of considerable theoretical and practical interest. Using a surface forces apparatus, we explored the force-distance profiles and adhesion energies of mussel foot protein 3 (mfp-3) to TiO2 surfaces at three different pHs (pH 3, 5.5 and 7.5). At pH 3, mfp-3 showed the strongest adhesion force on TiO2, with an adhesion energy of ∼-7.0 mJ/m(2). Increasing the pH gives rise to two opposing effects: (1) increased oxidation of Dopa, thus, decreasing availability for the Dopa-mediated adhesion, and (2) increased bidentate Dopa-Ti coordination, leading to the further stabilization of the Dopa group and, thus, an increase in adhesion force. Both effects were reflected in the resonance-enhanced Raman spectra obtained at the three deposition pHs. The two competing effects give rise to a higher adhesion force of mfp-3 on the TiO2 surface at pH 7.5 than at pH 5.5. Our results suggest that Dopa-containing proteins and synthetic polymers have great potential as coating materials for medical implant materials, particularly if redox activity can be controlled.
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Affiliation(s)
- Jing Yu
- Department of Chemical Engineering, University of California, Santa Barbara, California 93106, USA
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Tahmasebpoor M, de Martín L, Talebi M, Mostoufi N, van Ommen JR. The role of the hydrogen bond in dense nanoparticle-gas suspensions. Phys Chem Chem Phys 2013; 15:5788-93. [PMID: 23471179 DOI: 10.1039/c3cp43687j] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect of surface characteristics on the interaction between nanoparticles and their agglomeration in dense gas suspensions is still not fully understood. It is known that when the surface is covered with hydroxyl groups, the interaction between nanoparticles becomes substantially stronger than in the absence of these groups; this strengthening is typically attributed to the formation of capillary bridges between the particles. However, this work shows that part of the increase of the interaction is due to the direct hydrogen bonds formed between the surfaces of the polar particles. Dry nitrogen was used to fluidize polar (hydrophilic) and apolar (hydrophobic) SiO2, TiO2 and Al2O3 particles, with a size ranging from 13 to 21 nm. The dry polar particles showed smaller bed expansion and larger minimum fluidization velocity compared to their apolar counterparts, indicating stronger interparticle forces. The results show the importance of including the formation of hydrogen bonds in the modeling of the interaction between dry and polar nanoparticles.
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Affiliation(s)
- Maryam Tahmasebpoor
- Multiphase Research Systems Lab., School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran
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