1
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Bassani I, Bellini R, Vizzarro A, Coti C, Pozzovivo V, Barbieri D, Pirri CF, Verga F, Menin B. Biogeochemical characterization of four depleted gas reservoirs for conversion into underground hydrogen storage. Environ Microbiol 2023; 25:3683-3702. [PMID: 37964633 DOI: 10.1111/1462-2920.16538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2023] [Accepted: 10/31/2023] [Indexed: 11/16/2023]
Abstract
Depleted gas reservoirs are a valuable option for underground hydrogen storage (UHS). However, different classes of microorganisms, which are capable of using free H2 as a reducing agent for their metabolism, inhabit deep underground formations and can potentially affect the storage. This study integrates metagenomics based on Illumina-NGS sequencing of bacterial and archaeal 16S rRNA and dsrB and mcrA functional genes to unveil the composition and the variability of indigenous microbial populations of four Italian depleted reservoirs. The obtained mcrA sequences allow us to implement the existing taxonomic database for mcrA gene sequences with newly classified sequences obtained from the Italian gas reservoirs. Moreover, the KEGG and COG predictive functional annotation was used to highlight the metabolic pathways potentially associated with hydrogenotrophic metabolisms. The analyses revealed the specificity of each reservoir microbial community, and taxonomic and functional data highlighted the presence of an enriched number of taxa, whose activity depends on both reservoir hydrochemical composition and nutrient availability, of potential relevance in the context of UHS. This study is the very first to address the profiling of the microbial population and allowed us to perform a preliminary assessment of UHS feasibility in Italy.
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Affiliation(s)
- Ilaria Bassani
- Centre for Sustainable Future Technologies, Fondazione Istituto Italiano di Tecnologia, Turin, Italy
| | - Ruggero Bellini
- Centre for Sustainable Future Technologies, Fondazione Istituto Italiano di Tecnologia, Turin, Italy
| | - Arianna Vizzarro
- Centre for Sustainable Future Technologies, Fondazione Istituto Italiano di Tecnologia, Turin, Italy
| | | | | | | | - Candido Fabrizio Pirri
- Centre for Sustainable Future Technologies, Fondazione Istituto Italiano di Tecnologia, Turin, Italy
- Department of Applied Science and Technology, Politecnico di Torino, Turin, Italy
| | - Francesca Verga
- Department of Applied Science and Technology, Politecnico di Torino, Turin, Italy
| | - Barbara Menin
- Centre for Sustainable Future Technologies, Fondazione Istituto Italiano di Tecnologia, Turin, Italy
- National Research Council, Institute of Agricultural Biology and Biotechnology (CNR-IBBA), Milan, Italy
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2
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Liu J, Zhao J, Louie SM, Gao X, Zhang P, Liang D, Hu Y. Comparative study on effects of pH, electrolytes, and humic acid on the stability of acetic and polyacrylic acid coated magnetite nanoparticles. CHEMOSPHERE 2023; 319:137992. [PMID: 36720411 DOI: 10.1016/j.chemosphere.2023.137992] [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: 10/29/2022] [Revised: 01/17/2023] [Accepted: 01/27/2023] [Indexed: 06/18/2023]
Abstract
The poor colloidal stability of magnetite nanoparticles (MNPs) limits their mobility and application, so various organic coatings (OCs) were applied to MNPs. Here, a comparative study on the colloidal stability of MNPs coated with acetic (HAc) and polyacrylic acids (PAA) was conducted under varied pH (5.0-9.0) in the presence of different concentrations of cations and anions, as well as humic acid (HA). Comparing the effects of various cations and anions, the stability of both HAc/PAA-MNPs followed the order: Na+ > Ca2+and PO43- > SO42- > Cl-, which could be explained by their adsorption behaviors onto HAc/PAA-MNPs and the resulting surface charge changes. Under all conditions even with more anion adsorption onto HAc-MNPs (0.14-22.56 mg/g) than onto PAA-MNPs (0.04-18.34 mg/g), PAA-MNPs were more negatively charged than HAc-MNPs, as PAA has a lower pHIEP (2.6 ± 0.1) than that of HAc (3.7 ± 0.1). Neither the HAc nor PAA coatings were displaced by phosphate even at considerably high phosphate concentration. Compared with HAc-MNPs, the stability of PAA-MNPs was greatly improved under all studied conditions, which could be due to both stronger electrostatic and additional steric repulsion forces among PAA-MNPs. Besides, under all conditions, Derjaguin-Landau-Verwey-Overbeek (DLVO) explained well the aggregation kinetic of HAc-MNPs; while extended DLVO (EDLVO) successfully predict that of PAA-MNPs, indicating steric forces among PAA-MNPs. The aggregation of HAc/PAA-MNPs was all inhibited in varied electrolyte solutions by HA (2 mg C/L) addition. This study suggested that carboxyl coatings with higher molecular weights and pKa values could stabilize MNPs better due to stronger electrostatic and additional steric repulsion. However, in the presence of HA, these two forces were mainly controlled by adsorbed HA instead of the organic pre-coatings on MNPs.
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Affiliation(s)
- Juanjuan Liu
- State Key Laboratory of Biogeology & Environmental Geology and School of Environmental Studies, China University of Geosciences, Wuhan, Hubei, 430074, PR China; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China; The Key Laboratory of Water and Sediment Sciences (Ministry of Education), State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China
| | - Juntao Zhao
- Department of Civil & Environmental Engineering, University of Houston, Houston, TX, 77004, United States; Benchmark Lab & Services, Houston, TX, 77092, United States
| | - Stacey M Louie
- Department of Civil & Environmental Engineering, University of Houston, Houston, TX, 77004, United States
| | - Xubo Gao
- State Key Laboratory of Biogeology & Environmental Geology and School of Environmental Studies, China University of Geosciences, Wuhan, Hubei, 430074, PR China
| | - Ping Zhang
- Faculty of Science and Technology, University of Macau, Macau, 999078, China
| | - Dongli Liang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi, 712100, China.
| | - Yandi Hu
- The Key Laboratory of Water and Sediment Sciences (Ministry of Education), State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China.
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3
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Babakhani P, Phenrat T, Baalousha M, Soratana K, Peacock CL, Twining BS, Hochella MF. Potential use of engineered nanoparticles in ocean fertilization for large-scale atmospheric carbon dioxide removal. NATURE NANOTECHNOLOGY 2022; 17:1342-1351. [PMID: 36443601 PMCID: PMC9747614 DOI: 10.1038/s41565-022-01226-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Accepted: 09/05/2022] [Indexed: 06/06/2023]
Abstract
Artificial ocean fertilization (AOF) aims to safely stimulate phytoplankton growth in the ocean and enhance carbon sequestration. AOF carbon sequestration efficiency appears lower than natural ocean fertilization processes due mainly to the low bioavailability of added nutrients, along with low export rates of AOF-produced biomass to the deep ocean. Here we explore the potential application of engineered nanoparticles (ENPs) to overcome these issues. Data from 123 studies show that some ENPs may enhance phytoplankton growth at concentrations below those likely to be toxic in marine ecosystems. ENPs may also increase bloom lifetime, boost phytoplankton aggregation and carbon export, and address secondary limiting factors in AOF. Life-cycle assessment and cost analyses suggest that net CO2 capture is possible for iron, SiO2 and Al2O3 ENPs with costs of 2-5 times that of conventional AOF, whereas boosting AOF efficiency by ENPs should substantially enhance net CO2 capture and reduce these costs. Therefore, ENP-based AOF can be an important component of the mitigation strategy to limit global warming.
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Affiliation(s)
- Peyman Babakhani
- Earth Surface Science Institute, School of Earth and Environment, University of Leeds, Leeds, UK
| | - Tanapon Phenrat
- Research Unit for Integrated Natural Resources Remediation and Reclamation (IN3R), Department of Civil Engineering, Faculty of Engineering, Naresuan University, Phitsanulok, Thailand
- Center of Excellence for Sustainability of Health, Environment and Industry (SHE&I), Faculty of Engineering, Naresuan University, Phitsanulok, Thailand
| | - Mohammed Baalousha
- Center for Environmental Nanoscience and Risk, Department of Environmental Health Sciences, Arnold School of Public Health, University of South Carolina, Columbia, SC, USA
| | - Kullapa Soratana
- Faculty of Logistics and Digital Supply Chain, Naresuan University, Phitsanulok, Thailand
| | - Caroline L Peacock
- Earth Surface Science Institute, School of Earth and Environment, University of Leeds, Leeds, UK
| | | | - Michael F Hochella
- Earth Systems Science Division, Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, USA.
- Department of Geosciences, Virginia Tech, Blacksburg, VA, USA.
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4
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Nune SK, Miller QRS, Schaef HT, Jian T, Song M, Li D, Shuttanandan V, McGrail BP. Transport of polymer-coated metal-organic framework nanoparticles in porous media. Sci Rep 2022; 12:13962. [PMID: 35978019 PMCID: PMC9385709 DOI: 10.1038/s41598-022-18264-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 08/08/2022] [Indexed: 11/09/2022] Open
Abstract
Injecting fluids into deep underground geologic structures is a critical component to development of long-term strategies for managing greenhouse gas emissions and facilitating energy extraction operations. Recently, we reported that metal-organic frameworks are low-frequency, absorptive-acoustic metamaterial that may be injected into the subsurface to enhance geophysical monitoring tools used to track fluids and map complex structures. A key requirement for this nanotechnology deployment is transportability through porous geologic media without being retained by mineral-fluid interfaces. We used flow-through column studies to estimate transport and retention properties of five different polymer-coated MIL-101(Cr) nanoparticles (NP) in siliceous porous media. When negatively charged polystyrene sulfonate coated nanoparticles (NP-PSS-70K) were transported in 1 M NaCl, only about 8.4% of nanoparticles were retained in the column. Nanoparticles coated with polyethylenimine (NP-PD1) exhibited significant retention (> 50%), emphasizing the importance of complex nanoparticle-fluid-rock interactions for successful use of nanofluid technologies in the subsurface. Nanoparticle transport experiments revealed that nanoparticle surface characteristics play a critical role in nanoparticle colloidal stability and as well the transport.
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Affiliation(s)
- Satish K Nune
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA.
| | - Quin R S Miller
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - H Todd Schaef
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Tengyue Jian
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Miao Song
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Dongsheng Li
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Vaithiyalingam Shuttanandan
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA, 99352, USA
| | - B Peter McGrail
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
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5
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Liu J, Louie SM, Zhao J, Gao X, Hu Y. Aggregation of varied organic coated magnetite nanoparticles: Adsorbed mass and thickness of coatings and interactions with natural organic matter. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 831:154976. [PMID: 35378183 DOI: 10.1016/j.scitotenv.2022.154976] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Revised: 03/28/2022] [Accepted: 03/28/2022] [Indexed: 06/14/2023]
Abstract
Magnetite nanoparticles (MNPs) with varied organic coatings (OCs) which improved their stability have broad environmental applications. However, the adsorbed amounts and layer thickness of varied OCs onto MNPs during the synthesis were generally not or poorly characterized, and their interactions with natural organic matter (NOM) were still in progress. In this study, acetic (HAc), citric (CA), and polyacrylic acid (PAA) were selected as model OCs, the adsorption behaviors of OCs on MNPs were characterized under varied aqueous C/Fe ratios, and the aggregation behaviors of MNPs with varied OCs (OC-MNPs) at neutral pH (7.0 ± 0.2) with NaCl (5-800 mM) in the presence/absence of NOM were systematically investigated. Under low aqueous C/Fe ratio, the adsorbed amounts of model OCs as -COOH/Fe ratio followed the order: CA ≈ PAA > > HAc. With high aqueous C/Fe ratio, the maximum adsorbed masses of OC-MNPs were similar. The adsorbed layer thicknesses of OC-MNPs were thoroughly characterized using three different methods, all showing that the adsorbed layer of PAA was thicker than that of CA and HAc. Derjaguin-Landau-Verwey-Overbeek (DLVO) and extended DLVO (EDLVO) calculations showed that electrostatic and van der Waals forces were dominant for CA-MNPs and HAc-MNPs stabilization; while steric repulsion played major roles in stabilizing PAA-MNPs, probably due to a thicker PAA layer. In the presence of NOM, stability behaviors of all OC-MNPs were similar, ascribing to the much greater amounts of NOM adsorbed than the OCs, causing greater steric repulsion. This study provides new mechanistic insights which could help better understand the effects of varied OCs on MNPs' colloidal stability.
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Affiliation(s)
- Juanjuan Liu
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; State Key Laboratory of Biogeology & Environmental Geology, School of Environmental Studies, China University of Geosciences, Wuhan, Hubei 430074, China
| | - Stacey M Louie
- Department of Civil & Environmental Engineering, University of Houston, Houston, TX 77004, United States
| | - Juntao Zhao
- Department of Civil & Environmental Engineering, University of Houston, Houston, TX 77004, United States; Benchmark Lab & Services, Houston, TX 77092, United States
| | - Xubo Gao
- State Key Laboratory of Biogeology & Environmental Geology, School of Environmental Studies, China University of Geosciences, Wuhan, Hubei 430074, China
| | - Yandi Hu
- The Key Laboratory of Water and Sediment Sciences, Ministry of Education, State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
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6
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Izadi N, Nasernejad B. Newly engineered alumina quantum dot-based nanofluid in enhanced oil recovery at reservoir conditions. Sci Rep 2022; 12:9505. [PMID: 35680935 PMCID: PMC9184488 DOI: 10.1038/s41598-022-12387-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2022] [Accepted: 04/25/2022] [Indexed: 11/09/2022] Open
Abstract
In this work, a newly engineered alumina quantum dot-based nanofluid (α-AQDs; D ~ 4 nm; amorphous solid) and one commercial alumina nanoparticle-based nanofluid (γ-ANPs; D ~ 20 nm; crystalline type) with the capability of strong colloidal dispersion at reservoir conditions, such as, high salinity, divalent ions (Ca2+) and high temperature was compared. The main goal of this research was to study the crude oil displacement mechanisms of alumina suspensions as a function of variety in size and particle morphology in aged carbonate rocks. The strong interaction potential between the particles was achieved by the citric acid and a special composition of a carboxylate-sulfonate-based polyelectrolyte polymer as an effective dispersant compound on the surface, leading to a negative particle charges and an additional steric and electrostatic repulsion. Wettability alteration upon exposure to fluids using the contact angle and the Amott cell were performed on saturated carbonate plug samples and rock slices. While, dynamic core displacements were conducted to test the water/nanofluid/oil flow and nanoparticle retention behavior thorough typical pore throats underground the reservoir conditions. The stability results revealed that PE-polymer was able to create a long-term colloidal fluid during 30 days. It was found that mass concentration of nanofluid increased with decreasing in particle size. The optimal amount of particles in aqueous solution was obtained 0.05 wt% for ANPs, increased up to 0.1 wt% for AQDs. Analysis of experiments showed that wettability alteration was the main mechanism during nanofluid injection. Laboratory core-flooding data proved that the enhanced oil recovery due to a less concentration state by ANPs was consistent with AQDs at higher concentrations. In addition, permeability-impairment-behavior study was discussed in terms of possible mineral scale deposition and alumina release on the rock surface. Results showed that a large extent of permeability damage caused by mineral scale (55-59%). Alumina quantum dot-based nanofluids were found a minimum impairment (2-4%) and a significant reduction of ~ 10% in permeability was observed for ANPs-based nanofluid.
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Affiliation(s)
- Nosrat Izadi
- Department of Chemical Engineering, Amirkabir University of Technology, Tehran, 15875-4413, Iran
| | - Bahram Nasernejad
- Department of Chemical Engineering, Amirkabir University of Technology, Tehran, 15875-4413, Iran.
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7
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Xiao Z, Zhang L, Colvin VL, Zhang Q, Bao G. Synthesis and Application of Magnetic Nanocrystal Clusters. Ind Eng Chem Res 2022. [DOI: 10.1021/acs.iecr.1c04879] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhen Xiao
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Linlin Zhang
- Department of Bioengineering, Rice University, Houston, Texas 77005, United States
| | - Vicki L. Colvin
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Qingbo Zhang
- Department of Bioengineering, Rice University, Houston, Texas 77005, United States
| | - Gang Bao
- Department of Bioengineering, Rice University, Houston, Texas 77005, United States
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8
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Ahmed ST, Madinya JJ, Leckband DE. Ionic strength dependent forces between end-grafted Poly(sulfobetaine) films and mica. J Colloid Interface Sci 2022; 606:298-306. [PMID: 34392027 DOI: 10.1016/j.jcis.2021.08.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 07/26/2021] [Accepted: 08/01/2021] [Indexed: 12/12/2022]
Abstract
The molecular surface properties of zwitterionic polymer coatings are central to their ultra-low fouling properties and effectiveness as steric stabilizers in concentrated salt solutions. Here, Surface Force Apparatus measurements quantified the molecular forces between end-grafted poly(sulfobetaine) methacrylate thin films and mica, as a function of the chain grafting density and ionic strength. These results demonstrate that, at the ionic strengths considered, end-grafted poly(sulfobetaine) films can be described by models for polymers in good solvent. Parameters determined from data fits to the Milner-Witten-Cates or Dolan and Edwards models for dense or dilute chains, respectively, varied with ionic strength, in ways that reflect poly(sulfobetaine) swelling and the increased excluded volume strength of chain segments. These force measurements provide new insight into how polymer coverage and salt cooperate to regulate repulsive poly(sulfobetaine) steric barriers. These findings have implications for the design of grafted poly(sulfobetaine) as colloidal stabilizers or nonfouling surface coatings.
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Affiliation(s)
- Syeda Tajin Ahmed
- Department of Chemical and Biomolecular Engineering, 600 South Mathews Avenue, Roger Adams Laboratory, Urbana, IL 61801, USA
| | - Jason J Madinya
- Department of Chemical and Biomolecular Engineering, 600 South Mathews Avenue, Roger Adams Laboratory, Urbana, IL 61801, USA
| | - Deborah E Leckband
- Department of Chemical and Biomolecular Engineering, 600 South Mathews Avenue, Roger Adams Laboratory, Urbana, IL 61801, USA; Department of Chemical and Biomolecular Engineering and Department of Chemistry, University of Illinois at Urbana-Champaign, 600 South Mathews Avenue, Roger Adams Laboratory, Urbana, IL 61801, USA.
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9
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Pan B, Yin X, Ju Y, Iglauer S. Underground hydrogen storage: Influencing parameters and future outlook. Adv Colloid Interface Sci 2021; 294:102473. [PMID: 34229179 DOI: 10.1016/j.cis.2021.102473] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2021] [Revised: 06/07/2021] [Accepted: 06/23/2021] [Indexed: 11/24/2022]
Abstract
Underground hydrogen storage (UHS) is a promising technology with which large quantities of H2 can potentially be stored in the subsurface safely, economically and efficiently. As UHS is a relatively new technology, we critically reviewed all available data related to solid properties, fluid properties and solid-fluid interactions relevant to UHS. We also provide clear conclusions, and highlight research gaps. This review therefore advances fundamental understanding of UHS at multiple physical scales and provides key guidance for UHS project operations at reservoir scale.
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10
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Park Y, Cho H. Improvement in the dispersion stability of iron oxide nanoparticles in highly concentrated brine solution using encapsulation with polymer-polymer crosslinked shells. ADV POWDER TECHNOL 2020. [DOI: 10.1016/j.apt.2020.11.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Xiao Z, Zhang Q, Guo X, Villanova J, Hu Y, Külaots I, Garcia-Rojas D, Guo W, Colvin VL. Libraries of Uniform Magnetic Multicore Nanoparticles with Tunable Dimensions for Biomedical and Photonic Applications. ACS APPLIED MATERIALS & INTERFACES 2020; 12:41932-41941. [PMID: 32812740 DOI: 10.1021/acsami.0c09778] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Multicore iron oxide nanoparticles, also known as colloidal nanocrystal clusters, are magnetic materials with diverse applications in biomedicine and photonics. Here, we examine how both of their characteristic dimensional features, the primary particle and sub-micron colloid diameters, influence their magnetic properties and performance in two different applications. The characterization of these basic size-dependent properties is enabled by a synthetic strategy that provides independent control over both the primary nanocrystal and cluster dimensions. Over a wide range of conditions, electron microscopy and X-ray diffraction reveal that the oriented attachment of smaller nanocrystals results in their crystallographic alignment throughout the entire superstructure. We apply a sulfonated polymer with high charge density to prevent cluster aggregation and conjugate molecular dyes to particle surfaces so as to visualize their collection using handheld magnets. These libraries of colloidal clusters, indexed both by primary nanocrystal dimension (dp) and overall cluster diameter (Dc), form magnetic photonic crystals with relatively weak size-dependent properties. In contrast, their performance as MRI T2 contrast agents is highly sensitive to cluster diameter, not primary particle size, and is optimized for materials of 50 nm diameter (r2 = 364 mM-1 s-1). These results exemplify the relevance of dimensional control in developing applications for these versatile materials.
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Affiliation(s)
- Zhen Xiao
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Qingbo Zhang
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Xiaoting Guo
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Jake Villanova
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Yue Hu
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
| | - Indrek Külaots
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
| | - Daniel Garcia-Rojas
- Department of Chemistry, Rice University, Houston, Texas 77005, United States
| | - Wenhua Guo
- Shared Equipment Authority, Rice University, Houston, Texas 77005, United States
| | - Vicki L Colvin
- Department of Chemistry, Brown University, Providence, Rhode Island 02912, United States
- School of Engineering, Brown University, Providence, Rhode Island 02912, United States
- Center for Biomedical Engineering, Brown University, Providence, Rhode Island 02912, United States
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12
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He Y, Alamri H, Kawelah M, Gizzatov A, Alghamdi MF, Swager TM, Zhu SS. Brine-Soluble Zwitterionic Copolymers with Tunable Adsorption on Rocks. ACS APPLIED MATERIALS & INTERFACES 2020; 12:13568-13574. [PMID: 32150375 PMCID: PMC7307833 DOI: 10.1021/acsami.0c02247] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 02/26/2020] [Indexed: 06/10/2023]
Abstract
Injection of aqueous fluids into reservoirs as an enhanced oil recovery (EOR) tool has been of great interest in petroleum engineering. EOR using viscous polymer solutions improves the volumetric sweep efficiency. However, significant polymer adsorption on reservoir rock surfaces is one of the greatest challenges in polymer-flooding EOR. We have synthesized and characterized five zwitterionic copolymers and studied their static adsorption on limestone surfaces in seawater at high temperatures and salinities. Our results indicate that polymer adsorption directly correlates to a small percentage of functional co-monomers on the polymer backbone. One particular copolymer shows negligible static adsorption on limestone surfaces.
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Affiliation(s)
- Yuan He
- Department of Chemistry
and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Haleema Alamri
- Department of Chemistry
and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
- Non-Metallic
Applications Development Division, Research & Development Center,
Saudi Aramco, KAUST, Thuwal 23955, Saudi Arabia
| | - Mohammed Kawelah
- Aramco
Services Company: Aramco Research Center—Boston, 400 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Ayrat Gizzatov
- Aramco
Services Company: Aramco Research Center—Boston, 400 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Mariam F. Alghamdi
- Aramco
Services Company: Aramco Research Center—Boston, 400 Technology Square, Cambridge, Massachusetts 02139, United States
| | - Timothy M. Swager
- Department of Chemistry
and Institute for Soldier Nanotechnologies, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - S. Sherry Zhu
- Aramco
Services Company: Aramco Research Center—Boston, 400 Technology Square, Cambridge, Massachusetts 02139, United States
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13
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Ureña-Benavides EE, Moaseri E, Changalvaie B, Fei Y, Iqbal M, Lyon BA, Kmetz AA, Pennell KD, Ellison CJ, Johnston KP. Polyelectrolyte coated individual silica nanoparticles dispersed in concentrated divalent brine at elevated temperatures for subsurface energy applications. Colloids Surf A Physicochem Eng Asp 2020. [DOI: 10.1016/j.colsurfa.2019.124276] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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14
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Yu J, Nap RJ, Szleifer I, Wong JY. Effect of Polymer Surface Modification of Superparamagnetic Iron Oxide Nanoparticle Dispersions in High Salinity Environments. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:15864-15871. [PMID: 31353909 DOI: 10.1021/acs.langmuir.9b01944] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Superparamagnetic nanoparticles (SPIONs) can be used as nuclear magnetic resonance (NMR) signal enhancement agents for petroleum exploration. This enhancement effect is uniform if SPIONs are monodisperse in size and in composition; yet it is challenging to synthesize monodisperse particles that do not aggregate in high salinity petroleum brine. Here, we report a method to synthesize individual SPIONs coated with tunable surface coating densities of poly(2-acrylamido-2-methyl-1-propanesulfonic acid (pAMPS) with a catechol end-group (pAMPS*). To establish parameters under which pAMPS*-coated SPIONS do not aggregate, we compared computational predictions with experimental results for variations in pAMPS* chain length and surface coverage. Using this combined theoretical and experimental approach, we show that singly dispersed SPIONs remained stabilized in petroleum brine for up to 75 h with high surface density pAMPS*.
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Affiliation(s)
- Jin Yu
- Division of Materials Science and Engineering , Boston University , Boston Massachusetts 02215 United States
| | - Rikkert J Nap
- Department of Biomedical Engineering and Chemistry of Life Processes Institute , Northwestern University , Evanston , Illinois 60208 United States
| | - Igal Szleifer
- Department of Biomedical Engineering and Chemistry of Life Processes Institute , Northwestern University , Evanston , Illinois 60208 United States
| | - Joyce Y Wong
- Division of Materials Science and Engineering , Boston University , Boston Massachusetts 02215 United States
- Department of Biomedical Engineering , Boston University , Boston Massachusetts 02215 United States
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15
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Yu J, Zhang T, Xu H, Dong X, Cai Y, Pan Y, Cao C. Thermostable iron oxide nanoparticle synthesis within recombinant ferritins from the hyperthermophile Pyrococcus yayanosii CH1. RSC Adv 2019; 9:39381-39393. [PMID: 35540659 PMCID: PMC9076106 DOI: 10.1039/c9ra07397c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2019] [Accepted: 11/14/2019] [Indexed: 12/15/2022] Open
Abstract
Thermostable nanoparticles have numerous applications in catalysis and in the oil/gas industry. However, synthesizing these nanoparticles requires expensive polymers. Here, a novel thermostable ferritin named PcFn, originally from the hyperthermophilic archaeon Pyrococcus yayanosii CH1, was overexpressed in Escherichia coli, purified and characterized, which could successfully direct the synthesis of thermostable magnetoferritins (M-PcFn) with monodispersed iron oxide nanoparticles in one step. Transmission electron microscopy and magnetic measurements show that the cores of the M-PcFn have an average diameter of 4.7 nm, are well-crystalline and superparamagnetic. Both the PcFn and M-PcFn can resist temperatures up to 110 °C, which is significantly higher than for human H-chain ferritin (HFn) and M-HFn, and comparable to temperatures previously reported for Pyrococcus furiosus ferritin (PfFn) and M-PfFn. After heating at 110 °C for 30 minutes, PcFn and M-PcFn maintained their secondary structures and PcFn retained 87.4% of its iron uptake activity. This remarkable thermostability of PcFn and M-PcFn suggests potential applications in elevated temperature environments.
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Affiliation(s)
- Jiacheng Yu
- Biogeomagnetism Group, Paleomagnetism and Geochronology Laboratory, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing 100029 P. R. China .,Innovation Academy for Earth Science, CAS Beijing 100029 P. R. China.,College of Earth Sciences, University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Tongwei Zhang
- Biogeomagnetism Group, Paleomagnetism and Geochronology Laboratory, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing 100029 P. R. China .,Innovation Academy for Earth Science, CAS Beijing 100029 P. R. China
| | - Huangtao Xu
- Biogeomagnetism Group, Paleomagnetism and Geochronology Laboratory, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing 100029 P. R. China .,Innovation Academy for Earth Science, CAS Beijing 100029 P. R. China.,College of Earth Sciences, University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Xiaoli Dong
- Department of Geoscience, University of Calgary Calgary AB T2N 1N4 Canada
| | - Yao Cai
- Biogeomagnetism Group, Paleomagnetism and Geochronology Laboratory, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing 100029 P. R. China .,Innovation Academy for Earth Science, CAS Beijing 100029 P. R. China
| | - Yongxin Pan
- Biogeomagnetism Group, Paleomagnetism and Geochronology Laboratory, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing 100029 P. R. China .,Innovation Academy for Earth Science, CAS Beijing 100029 P. R. China.,College of Earth Sciences, University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Changqian Cao
- Biogeomagnetism Group, Paleomagnetism and Geochronology Laboratory, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences Beijing 100029 P. R. China .,Innovation Academy for Earth Science, CAS Beijing 100029 P. R. China.,College of Earth Sciences, University of Chinese Academy of Sciences Beijing 100049 P. R. China
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16
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Ma L, Luo P, He Y, Zhang L, Fan Y, Jiang Z. Ultra-Stable Silica Nanoparticles as Nano-Plugging Additive for Shale Exploitation in Harsh Environments. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E1683. [PMID: 31775285 PMCID: PMC6955846 DOI: 10.3390/nano9121683] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Revised: 11/20/2019] [Accepted: 11/21/2019] [Indexed: 12/24/2022]
Abstract
Owing to the harsh downhole environments, poor dispersion of silica at high salinity and high temperature can severely restrict its application as the nano-plugging agent in shale gas exploitation. The objective of this study is to improve salt tolerance and thermal stability of silica. Herein, silica was successfully functionalized with an anionic polymer (p SPMA) by SI-ATRP (surface-initiated atom transfer radical polymerization), named SiO2-g-SPMA. The grafted pSPMA brushes on silica provided sufficient electrostatic repulsion and steric repulsion for stabilizing silica in a harsh environment. The modified silica (SiO2-g-SPMA) had excellent colloidal stability at salinities up to 5.43 M NaCl (saturated brine) and standard API brine (8 wt% NaCl + 2 wt% CaCl2) for 30 days at room temperature. Simultaneously, the SiO2-g-SPMA was stable at 170 °C for 24 h as well as stable in weakly alkali environment. Furthermore, the plugging performance of SiO2-g-SPMA in water-based drilling fluids for low permeate reservoir reached to 78.25% when adding a small amount of 0.5 wt% SiO2-g-SPMA, which effectively hindered the water invasion into formation and protected the reservoir.
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Affiliation(s)
- Lan Ma
- School of Science, Xihua University, Jinzhou Road, Chengdu 610039, Sichuan, China;
- State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, 8 Xindu Avenue, Chengdu 610500, Sichuan, China; (P.L.); (L.Z.)
| | - Pingya Luo
- State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, 8 Xindu Avenue, Chengdu 610500, Sichuan, China; (P.L.); (L.Z.)
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, 8 Xindu Avenue, Chengdu 610500, Sichuan, China;
| | - Yi He
- State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, 8 Xindu Avenue, Chengdu 610500, Sichuan, China; (P.L.); (L.Z.)
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, 8 Xindu Avenue, Chengdu 610500, Sichuan, China;
| | - Liyun Zhang
- State Key Lab of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, 8 Xindu Avenue, Chengdu 610500, Sichuan, China; (P.L.); (L.Z.)
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, 8 Xindu Avenue, Chengdu 610500, Sichuan, China;
| | - Yi Fan
- College of Chemistry and Chemical Engineering, Southwest Petroleum University, 8 Xindu Avenue, Chengdu 610500, Sichuan, China;
- Chengdu Graphene Application Institute of Industrial Technology, Leshan Road, Chengdu 610500, Sichuan, China
| | - Zhenju Jiang
- School of Science, Xihua University, Jinzhou Road, Chengdu 610039, Sichuan, China;
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17
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Byard SJ, Blanazs A, Miller JF, Armes SP. Cationic Sterically Stabilized Diblock Copolymer Nanoparticles Exhibit Exceptional Tolerance toward Added Salt. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:14348-14357. [PMID: 31592675 DOI: 10.1021/acs.langmuir.9b02789] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
For certain commercial applications such as enhanced oil recovery, sterically stabilized colloidal dispersions that exhibit high tolerance toward added salt are desirable. Herein, we report a series of new cationic diblock copolymer nanoparticles that display excellent colloidal stability in concentrated aqueous salt solutions. More specifically, poly(2-(acryloyloxy)ethyltrimethylammonium chloride) (PATAC) has been chain-extended by reversible addition-fragmentation chain transfer aqueous dispersion polymerization of diacetone acrylamide (DAAM) at 70 °C to produce PATAC100-PDAAMx diblock copolymer spheres at 20% w/w solids via polymerization-induced self-assembly. Transmission electron microscopy and dynamic light scattering (DLS) analysis confirm that the mean sphere diameter can be adjusted by systematic variation of the mean degree of polymerization of the PDAAM block. Remarkably, DLS studies confirm that highly cationic PATAC100-PDAAM1500 spheres retain their colloidal stability in the presence of either 4.0 M KCl or 3.0 M ammonium sulfate for at least 115 days at 20 °C. The mole fraction of PATAC chains within the stabilizer shell was systematically varied by the chain extension of various binary mixtures of non-ionic poly(N,N-dimethylacrylamide) (PDMAC) and cationic PATAC with DAAM to produce ([n] PATAC100 + [1 - n] PDMAC67)-PDAAMz diblock copolymer spheres at 20% w/w. DLS studies confirmed that a relatively high mole fraction of cationic PATAC stabilizer chains (n ≥ 0.75) is required for the dispersions to remain colloidally stable in 4.0 M KCl. Cationic worms and vesicles could also be synthesized using a binary mixture of PATAC and PDMAC precursors, where n = 0.10. However, the vesicles only remained colloidally stable up to 1.0 M KCl, whereas the worms proved to be stable up to 2.0 M KCl. Such block copolymer nanoparticles are expected to be useful model systems for understanding the behavior of aqueous colloidal dispersions in extremely salty media. Finally, zeta potentials determined using electrophoretic light scattering are presented for such nanoparticles dispersed in highly salty media.
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Affiliation(s)
- Sarah J Byard
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield , South Yorkshire S3 7HF , United Kingdom
| | - Adam Blanazs
- BASF SE , GMV/P-B001 , 67056 Ludwigshafen , Germany
| | - John F Miller
- Enlighten Scientific LLC , Hillsborough , North Carolina 27278 , United States
| | - Steven P Armes
- Department of Chemistry , University of Sheffield , Brook Hill , Sheffield , South Yorkshire S3 7HF , United Kingdom
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18
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Corredor LM, Husein MM, Maini BB. A review of polymer nanohybrids for oil recovery. Adv Colloid Interface Sci 2019; 272:102018. [PMID: 31450155 DOI: 10.1016/j.cis.2019.102018] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Revised: 07/30/2019] [Accepted: 08/07/2019] [Indexed: 12/11/2022]
Abstract
As oil fields go into their final stage of production, new technologies are necessary to sustain production and increase the recovery of the hydrocarbon. Chemical injection is an enhanced recovery technique, which focuses on increasing the effectiveness of waterfloods. However, the use of chemical flooding has been hampered by its relatively high cost and the adsorption of the injected chemicals onto the reservoir rocks. In recent years, nanofluids have been launched as an overall less expensive and more efficient alternative to other chemical agents. Nanoparticle inclusion is also proposed to mitigate polymer flooding performance limitations under harsh reservoir conditions. This review presents a comprehensive discussion of the most recent developments of polymer nanohybrids for oil recovery. First, the preparation methods of polymer nanohybrids are summarized and explained. Then, an explanation of the different mechanisms leading to improved oil recovery are highlighted. Finally, the current challenges and opportunities for future development and application of polymer nanohybrids for chemical flooding are identified.
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19
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Understanding Calcium-Mediated Adhesion of Nanomaterials in Reservoir Fluids by Insights from Molecular Dynamics Simulations. Sci Rep 2019; 9:10763. [PMID: 31341192 PMCID: PMC6656760 DOI: 10.1038/s41598-019-46999-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Accepted: 07/05/2019] [Indexed: 12/11/2022] Open
Abstract
Interest in nanomaterials for subsurface applications has grown markedly due to their successful application in a variety of disciplines, such as biotechnology and medicine. Nevertheless, nanotechnology application in the petroleum industry presents greater challenges to implementation because of the harsh conditions (i.e. high temperature, high pressure, and high salinity) that exist in the subsurface that far exceed those present in biological applications. The most common subsurface nanomaterial failures include colloidal instability (aggregation) and sticking to mineral surfaces (irreversible retention). We previously reported an atomic force microscopy (AFM) study on the calcium-mediated adhesion of nanomaterials in reservoir fluids (S. L. Eichmann and N. A. Burnham, Sci. Rep. 7, 11613, 2017), where we discovered that the functionalized and bare AFM tips showed mitigated adhesion forces in calcium ion rich fluids. Herein, molecular dynamics reveal the molecular-level details in the AFM experiments. Special attention was given to the carboxylate-functionalized AFM tips because of their prominent ion-specific effects. The simulation results unambiguously demonstrated that in calcium ion rich fluids, the strong carboxylate-calcium ion complexes prevented direct carboxylate-calcite interactions, thus lowering the AFM adhesion forces. We performed the force measurement simulations on five representative calcite crystallographic surfaces and observed that the adhesion forces were about two to three fold higher in the calcium ion deficient fluids compared to the calcium ion rich fluids for all calcite surfaces. Moreover, in calcium ion deficient fluids, the adhesion forces were significantly stronger on the calcite surfaces with higher calcium ion exposures. This indicated that the interactions between the functionalized AFM tips and the calcite surfaces were mainly through carboxylate interactions with the calcium ions on calcite surfaces. Finally, when analyzing the order parameters of the tethered functional groups, we observed significantly different behavior of the alkanethiols depending on the absence or presence of calcium ions. These observations agreed well with AFM experiments and provided new insights for the competing carboxylate/calcite/calcium ion interactions.
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20
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Park Y, Huh C, Ok J, Cho H. One-Step Synthesis and Functionalization of High-Salinity-Tolerant Magnetite Nanoparticles with Sulfonated Phenolic Resin. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:8769-8775. [PMID: 31244256 DOI: 10.1021/acs.langmuir.9b00752] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Superparamagnetic nanoparticles are being actively developed for various applications in oil fields. A key requirement for such nanoparticles is the long-term stability of their dispersion under harsh subsurface conditions such as high salinity and high temperature. In this study, through functionalization of the surface of the magnetite nanoparticles with a sulfonated phenolic resin, stable dispersions of the nanoparticles in 5 wt % NaCl solution at neutral to basic pH were achieved. Sulfonated phenolic resin is aromatic in nature and can endure high temperatures; moreover, the strongly anionic sulfonate groups facilitate sufficient electrostatic repulsion between the particles even in a highly saline environment. Sulfonated phenolic resin was synthesized by heating a mixture of 4-hydroxybenzenesulfonic acid and formaldehyde at 1:1 molar ratio. Then, by synthesizing magnetite nanoparticles by a co-precipitation process in a solution of sulfonated phenolic resin, one-pot synthesis/surface functionalization was accomplished, which not only simplifies the manufacturing process but also can potentially lower the cost of production owing to the use of readily available phenolic resins. The reliability of the technique was confirmed by the detailed characterization of the nanoparticle through size distribution analysis, thermogravimetric analysis, ζ-potential measurements, transmission electron microscopy imaging, and energy-dispersive X-ray spectroscopy mapping. Further, Langevin curve was generated for evaluating the superparamagnetism of the nanoparticles.
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Affiliation(s)
| | - Chun Huh
- Department of Petroleum & Geosystems Engineering , University of Texas at Austin , Austin , Texas 78712 , United States
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21
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22
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23
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Preparation of metal-polymer nanocomposites by chemical reduction of metal ions: functions of polymer matrices. JOURNAL OF POLYMER RESEARCH 2018. [DOI: 10.1007/s10965-018-1646-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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24
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Nourafkan E, Haruna MA, Gardy J, Wen D. Improved rheological properties and stability of multiwalled carbon nanotubes/polymer in harsh environment. J Appl Polym Sci 2018. [DOI: 10.1002/app.47205] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Ehsan Nourafkan
- School of Chemical and Process Engineering; University of Leeds; Leeds LS2 9JT United Kingdom
| | - Maje Alhaji Haruna
- School of Chemical and Process Engineering; University of Leeds; Leeds LS2 9JT United Kingdom
| | - Jabbar Gardy
- School of Chemical and Process Engineering; University of Leeds; Leeds LS2 9JT United Kingdom
| | - Dongsheng Wen
- School of Chemical and Process Engineering; University of Leeds; Leeds LS2 9JT United Kingdom
- School of Aeronautic Science and Engineering; Beihang University; Beijing 100191 China
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25
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Gbadamosi AO, Junin R, Manan MA, Yekeen N, Agi A, Oseh JO. Recent advances and prospects in polymeric nanofluids application for enhanced oil recovery. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2018.05.020] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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26
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Huh C, Cho H. Silica, Fly Ash and Magnetite Nanoparticles for Improved Oil and Gas Production. ACTA ACUST UNITED AC 2018. [DOI: 10.32390/ksmer.2018.55.4.272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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27
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Nap RJ, Park SH, Szleifer I. Competitive calcium ion binding to end-tethered weak polyelectrolytes. SOFT MATTER 2018; 14:2365-2378. [PMID: 29503993 DOI: 10.1039/c7sm02434g] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We have developed a molecular model to describe the structural changes and potential collapse of weak polyelectrolyte layers end-tethered to planar surfaces and spherical nanoparticles as a function of pH and divalent ion concentration. In particular, we describe the structural changes of polymer-coated nanoparticles end-tethered to copolymers of poly(acrylic acid) (pAA) and poly arcrylamido-2-methylpropane sulfonate (pAMPS) in the presence of Ca2+ ions. We find that end-grafted poly(acrylic acid) layers will collapse in aqueous solutions containing sufficient amounts of Ca2+ ions, while polymers and copolymers with sufficient AMPS monomers will not collapse. The collapse of end-tethered pAA is due to the formation of calcium bridges between two acrylic acid monomers and one calcium ion. On the other hand pAMPS layers do not collapse due to the lack of calcium bridges. The collapse of pAA layers is strongly dependent on the pH as well as divalent and monovalent salt concentrations of the environment. The collapse is also strongly influenced by the curvature of the tethering surface.
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Affiliation(s)
- Rikkert J Nap
- Department of Biomedical Engineering, Department of Chemistry, and Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois, USA.
| | - Sung Hyun Park
- Department of Biomedical Engineering, Department of Chemistry, and Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois, USA.
| | - Igal Szleifer
- Department of Biomedical Engineering, Department of Chemistry, and Chemistry of Life Processes Institute, Northwestern University, Evanston, Illinois, USA.
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28
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Liu J, Dai C, Hu Y. Aqueous aggregation behavior of citric acid coated magnetite nanoparticles: Effects of pH, cations, anions, and humic acid. ENVIRONMENTAL RESEARCH 2018; 161:49-60. [PMID: 29101829 DOI: 10.1016/j.envres.2017.10.045] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 09/29/2017] [Accepted: 10/25/2017] [Indexed: 05/26/2023]
Abstract
Improving the colloidal stability of magnetite nanoparticles (MNPs) is essential for their successful applications. In this study, the surface zeta potential and particle size evolutions of citric acid coated magnetite nanoparticles (CA-MNPs) were measured under varied aqueous conditions using dynamic light scattering (DLS). The effects of pH (5.0-9.0), ionic strength (IS), cations (Na+ and Ca2+), anions (phosphate, sulfate, and chloride) and humic acid on the aggregation behaviors of CA-MNPs were explored. Compared with bare MNPs, the stability of CA-MNPs were greatly improved over the typical pH range of natural aquatic environments (pH = 5.0-9.0), as the coated CA-MNPs were highly negatively charged over the pH range due to the low pKa1 value (3.13) of citrate acid. CA-MNPs were more stable in the presence of monovalent cation (Na+) compared with divalent cation (Ca2+), as Ca2+ could neutralize the surface charge of MNPs more significantly than Na+. In the presence of anions, the surface charges of CA-MNPs became more negative, and the stability of CA-MNPs followed the order: in phosphate > sulfate > chloride. The observed aggregation trend could be explained by the differences in the valences of the anions and their adsorption behaviors onto CA-MNPs, which altered the surface charges of CA-MNPs. The measured critical coagulation concentrations (CCC) values of CA-MNPs in these electrolyte solutions agreed well with Derjaguin-Landau-Verwey-Overbeek (DLVO) calculations. With the addition of Humic acid (HA), the aggregation of CA-MNPs was inhibited in all electrolyte solutions even with the critical coagulation concentrations. This is due to the adsorption of HA onto CA-MNPs, which enhanced the electrostatic and steric repulsive forces between CA-MNPs. Considering the good stability of CA-MNPs in solutions with varied pH and electrolyte compositions, as well as with the easy synthesis of CA-MNPs and their non-toxicity, this study suggested CA coating as a good strategy to increase the stability of MNPs.
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Affiliation(s)
- Juanjuan Liu
- Department of Civil & Environmental Engineering, University of Houston, Houston, TX 77004, United States; College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Chong Dai
- Department of Civil & Environmental Engineering, University of Houston, Houston, TX 77004, United States
| | - Yandi Hu
- Department of Civil & Environmental Engineering, University of Houston, Houston, TX 77004, United States.
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29
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Rouster P, Pavlovic M, Horváth E, Forró L, Dey SK, Szilagyi I. Influence of Protamine Functionalization on the Colloidal Stability of 1D and 2D Titanium Oxide Nanostructures. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:9750-9758. [PMID: 28829607 DOI: 10.1021/acs.langmuir.7b01815] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The colloidal stability of titanium oxide nanosheets (TNS) and nanowires (TiONW) was studied in the presence of protamine (natural polyelectrolyte) in aqueous dispersions, where the nanostructures possessed negative net charge, and the protamine was positively charged. Regardless of their shape, similar charging and aggregation behaviors were observed for both TNS and TiONW. Electrophoretic experiments performed at different protamine loadings revealed that the adsorption of protamine led to charge neutralization and charge inversion depending on the polyelectrolyte dose applied. Light scattering measurements indicated unstable dispersions once the surface charge was close to zero or slow aggregation below and above the charge neutralization point with negatively or positively charged nanostructures, respectively. These stability regimes were confirmed by the electron microscopy images taken at different polyelectrolyte loadings. The protamine dose and salt-dependent colloidal stability confirmed the presence of DLVO-type interparticle forces, and no experimental evidence was found for additional interactions (e.g., patch-charge, hydrophobic, or steric forces), which are usually present in similar polyelectrolyte-particle systems. These findings indicate that the polyelectrolyte adsorbs on the TNS and TiONW surfaces in a flat and extended conformation giving rise to the absence of surface heterogeneities. Therefore, protamine is an excellent biocompatible candidate to form smooth surfaces, for instance in multilayers composed of polyelectrolytes and particles to be used in biomedical applications.
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Affiliation(s)
- Paul Rouster
- School of Chemistry and Biochemistry, University of Geneva , CH-1205 Geneva, Switzerland
| | - Marko Pavlovic
- School of Chemistry and Biochemistry, University of Geneva , CH-1205 Geneva, Switzerland
| | - Endre Horváth
- School of Basic Sciences, École Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - László Forró
- School of Basic Sciences, École Polytechnique Fédérale de Lausanne , CH-1015 Lausanne, Switzerland
| | - Sandwip K Dey
- Materials Program, School for Engineering of Matter, Transport and Energy, Arizona State University , Tempe, Arizona 85287, United States
| | - Istvan Szilagyi
- School of Chemistry and Biochemistry, University of Geneva , CH-1205 Geneva, Switzerland
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30
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High temperature stability and low adsorption of sub-100 nm magnetite nanoparticles grafted with sulfonated copolymers on Berea sandstone in high salinity brine. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.01.080] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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31
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Worthen AJ, Tran V, Cornell KA, Truskett TM, Johnston KP. Steric stabilization of nanoparticles with grafted low molecular weight ligands in highly concentrated brines including divalent ions. SOFT MATTER 2016; 12:2025-2039. [PMID: 26758382 DOI: 10.1039/c5sm02787j] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Whereas numerous studies of stabilization of nanoparticles (NPs) in electrolytes have examined biological fluids, the interest has grown recently in media with much higher ionic strengths including seawater and brines relevant to environmental science and subsurface oil and gas reservoirs. Given that electrostatic repulsion is limited at extremely high ionic strengths due to charge screening, we have identified ligands that are well solvated in concentrated brine containing divalent cations and thus provide steric stabilization of silica nanoparticles. Specifically, the hydrodynamic diameter of silica nanoparticles with grafted low molecular weight ligands, a diol ether, [3-(2,3-dihydroxypropoxy)propyl]-trimethoxysilane, and a zwitterionic sulfobetaine, 3-([dimethyl(3-trimethoxysilyl)propyl]ammonio)propane-1-sulfonate, is shown with dynamic light scattering to remain essentially constant, indicating lack of aggregation, at room temperature and up to 80 °C for over 30 days. An extended DLVO model signifies that steric stabilization is strongly dominant against van der Waals attraction for ∼10 nm particles given that these ligands are well solvated even in highly concentrated brine. In contrast, polyethylene glycol oligomers do not provide steric stabilization at elevated temperatures, even at conditions where the ligands are soluble, indicating complicating factors including bridging of the ether oxygens by divalent cations.
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Affiliation(s)
- Andrew J Worthen
- McKetta Department of Chemical Engineering, University of Texas at Austin, Austin, Texas, USA.
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32
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Ureña-Benavides EE, Lin EL, Foster EL, Xue Z, Ortiz MR, Fei Y, Larsen ES, Kmetz AA, Lyon BA, Moaseri E, Bielawski CW, Pennell KD, Ellison CJ, Johnston KP. Low Adsorption of Magnetite Nanoparticles with Uniform Polyelectrolyte Coatings in Concentrated Brine on Model Silica and Sandstone. Ind Eng Chem Res 2016. [DOI: 10.1021/acs.iecr.5b03279] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Edward L. Lin
- Department
of Chemical Engineering, University of Texas, Austin, Texas 78712, United States
| | - Edward L. Foster
- Department
of Chemistry, University of Texas, Austin, Texas 78712, United States
| | - Zheng Xue
- Department
of Chemical Engineering, University of Texas, Austin, Texas 78712, United States
| | - Michael R. Ortiz
- Department
of Chemistry, University of Texas, Austin, Texas 78712, United States
| | - Yunping Fei
- Department
of Chemical Engineering, University of Texas, Austin, Texas 78712, United States
| | - Eric S. Larsen
- Department
of Chemistry, University of Texas, Austin, Texas 78712, United States
| | - Anthony A. Kmetz
- Department
of Civil and Environmental Engineering, Tufts University, Medford, Massachusetts 02155, United States
| | - Bonnie A. Lyon
- Department
of Civil and Environmental Engineering, Tufts University, Medford, Massachusetts 02155, United States
| | - Ehsan Moaseri
- Department
of Chemical Engineering, University of Texas, Austin, Texas 78712, United States
| | | | - Kurt D. Pennell
- Department
of Civil and Environmental Engineering, Tufts University, Medford, Massachusetts 02155, United States
| | - Christopher J. Ellison
- Department
of Chemical Engineering, University of Texas, Austin, Texas 78712, United States
| | - Keith P. Johnston
- Department
of Chemical Engineering, University of Texas, Austin, Texas 78712, United States
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33
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Pavlovic M, Li L, Dits F, Gu Z, Adok-Sipiczki M, Szilagyi I. Aggregation of layered double hydroxide nanoparticles in the presence of heparin: towards highly stable delivery systems. RSC Adv 2016. [DOI: 10.1039/c5ra26072h] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Heparin coating significantly enhanced the colloidal stability of layered double hydroxide nanoparticles.
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Affiliation(s)
- Marko Pavlovic
- Department of Inorganic and Analytical Chemistry
- University of Geneva
- Geneva
- Switzerland
| | - Li Li
- Australian Institute for Bioengineering and Nanotechnology
- The University of Queensland
- Brisbane
- Australia
| | - Francois Dits
- Department of Inorganic and Analytical Chemistry
- University of Geneva
- Geneva
- Switzerland
| | - Zi Gu
- Australian Institute for Bioengineering and Nanotechnology
- The University of Queensland
- Brisbane
- Australia
| | - Monika Adok-Sipiczki
- Department of Inorganic and Analytical Chemistry
- University of Geneva
- Geneva
- Switzerland
| | - Istvan Szilagyi
- Department of Inorganic and Analytical Chemistry
- University of Geneva
- Geneva
- Switzerland
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34
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Viscosity and stability of ultra-high internal phase CO2-in-water foams stabilized with surfactants and nanoparticles with or without polyelectrolytes. J Colloid Interface Sci 2016; 461:383-395. [DOI: 10.1016/j.jcis.2015.08.031] [Citation(s) in RCA: 100] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 08/14/2015] [Accepted: 08/18/2015] [Indexed: 11/17/2022]
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35
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Szabó T, Tóth V, Horváth E, Forró L, Szilagyi I. Tuning the aggregation of titanate nanowires in aqueous dispersions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:42-9. [PMID: 25525741 DOI: 10.1021/la504521e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Electrophoretic and dynamic light scattering (DLS) measurements revealed that aggregation in aqueous dispersion of titanate nanowires (TiONWs) can be tuned by poly(diallyldimethylammonium) chloride (PDADMAC) polyelectrolyte. The nanowires possessed negative charge under alkaline conditions which was compensated by the oppositely charged PDADMAC adsorbed on the surface. Such adsorption led to charge neutralization and subsequent charge reversal at the appropriate polyelectrolyte doses. The dispersions were stable at low PDADMAC concentration where the TiONWs possessed negative charge. However, fast aggregation of the nanowires occurred close to the charge neutralization point where the overall charge of the particles was zero. Charge inversion at high polyelectrolyte doses gave rise to restabilization of the samples and slow aggregation of the TiONWs even at higher ionic strengths where the original bare TiONW dispersions were unstable. The colloid stability of the bare nanowires can be explained well qualitatively by the Derjaguin, Landau, Verwey, and Overbeek (DLVO) theory; however, polyelectrolyte adsorption led to additional patch-charge attractions and osmotic repulsion between the particles. On the basis of the knowledge generated by the present work, experimental conditions (e.g., salt level, polyelectrolyte, and particle concentrations) can be adjusted in order to design stable and processable aqueous dispersions of TiONWs for further applications.
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Affiliation(s)
- Tamás Szabó
- Department of Inorganic and Analytical Chemistry, University of Geneva , 1205 Geneva, Switzerland
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36
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Nap RJ, Park SH, Szleifer I. On the stability of nanoparticles coated with polyelectrolytes in high salinity solutions. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/polb.23613] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Rikkert J. Nap
- Department of Biomedical Engineering; Northwestern University; Evanston Illinois
- Department of Chemistry; Northwestern University; Evanston Illinois
- Chemistry of Life Processes Institute; Northwestern University; Evanston Illinois
| | - Sung Hyun Park
- Department of Biomedical Engineering; Northwestern University; Evanston Illinois
- Department of Chemistry; Northwestern University; Evanston Illinois
- Chemistry of Life Processes Institute; Northwestern University; Evanston Illinois
| | - Igal Szleifer
- Department of Biomedical Engineering; Northwestern University; Evanston Illinois
- Department of Chemistry; Northwestern University; Evanston Illinois
- Chemistry of Life Processes Institute; Northwestern University; Evanston Illinois
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37
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Foster EL, Xue Z, Roach CM, Larsen ES, Bielawski CW, Johnston KP. Iron Oxide Nanoparticles Grafted with Sulfonated and Zwitterionic Polymers: High Stability and Low Adsorption in Extreme Aqueous Environments. ACS Macro Lett 2014; 3:867-871. [PMID: 35596350 DOI: 10.1021/mz5004213] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A facile "grafting through" approach was developed to tether tunable quantities of poly(2-acrylamido-2-methylpropanesulfonic acid) (PAMPS) as well as zwitterionic poly([3-(methacryloylamino)propyl]dimethyl(3-sulfopropyl)ammonium hydroxide) (PMPDSA) homopolymer onto iron oxide (IO) nanoparticles (NPs). In this case, homopolymers may be grafted, unlike "grafting to" approaches that often require copolymers containing anchor groups. The polymer coating provided steric stabilization of the NP dispersions at high salinities and elevated temperature (90 °C) and almost completely prevented adsorption of the NPs on silica microparticles and crushed Berea sandstone. The adsorption of PAMPS IO NPs decreased with the polymer loading, whereby the magnitude of the particle-surface electrosteric repulsion increased. The zwitterionic PMPDSA IO NPs displayed 1 order of magnitude less adsorption onto crushed Berea sandstone relative to the anionic PAMPS IO NPs. The ability to design homopolymer coatings on nanoparticle surfaces by the "grafting through" technique is of broad interest for designing stable dispersions and modulating the interactions between nanoparticles and solid surfaces.
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Affiliation(s)
- Edward L. Foster
- Department of Chemistry and §Department of Chemical
Engineering, University of Texas at Austin, Austin, Texas 78712, United States
| | - Zheng Xue
- Department of Chemistry and §Department of Chemical
Engineering, University of Texas at Austin, Austin, Texas 78712, United States
| | - Clarissa M. Roach
- Department of Chemistry and §Department of Chemical
Engineering, University of Texas at Austin, Austin, Texas 78712, United States
| | - Eric S. Larsen
- Department of Chemistry and §Department of Chemical
Engineering, University of Texas at Austin, Austin, Texas 78712, United States
| | - Christopher W. Bielawski
- Department of Chemistry and §Department of Chemical
Engineering, University of Texas at Austin, Austin, Texas 78712, United States
| | - Keith P. Johnston
- Department of Chemistry and §Department of Chemical
Engineering, University of Texas at Austin, Austin, Texas 78712, United States
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38
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Foster LM, Worthen AJ, Foster EL, Dong J, Roach CM, Metaxas AE, Hardy CD, Larsen ES, Bollinger JA, Truskett TM, Bielawski CW, Johnston KP. High interfacial activity of polymers "grafted through" functionalized iron oxide nanoparticle clusters. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10188-96. [PMID: 25111153 DOI: 10.1021/la501445f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
The mechanism by which polymers, when grafted to inorganic nanoparticles, lower the interfacial tension at the oil-water interface is not well understood, despite the great interest in particle stabilized emulsions and foams. A simple and highly versatile free radical "grafting through" technique was used to bond high organic fractions (by weight) of poly(oligo(ethylene oxide) monomethyl ether methacrylate) onto iron oxide clusters, without the need for catalysts. In the resulting ∼1 μm hybrid particles, the inorganic cores and grafting architecture contribute to the high local concentration of grafted polymer chains to the dodecane/water interface to produce low interfacial tensions of only 0.003 w/v % (polymer and particle core). This "critical particle concentration" (CPC) for these hybrid inorganic/polymer amphiphilic particles to lower the interfacial tension by 36 mN/m was over 30-fold lower than the critical micelle concentration of the free polymer (without inorganic cores) to produce nearly the same interfacial tension. The low CPC is favored by the high adsorption energy (∼10(6) kBT) for the large ∼1 μm hybrid particles, the high local polymer concentration on the particles surfaces, and the ability of the deformable hybrid nanocluster cores as well as the polymer chains to conform to the interface. The nanocluster cores also increased the entanglement of the polymer chains in bulk DI water or synthetic seawater, producing a viscosity up to 35,000 cP at 0.01 s(-1), in contrast with only 600 cP for the free polymer. As a consequence of these interfacial and rheological properties, the hybrid particles stabilized oil-in-water emulsions at concentrations as low as 0.01 w/v %, with average drop sizes down to 30 μm. In contrast, the bulk viscosity was low for the free polymer, and it did not stabilize the emulsions. The ability to influence the interfacial activity and rheology of polymers upon grafting them to inorganic particles, including clusters, may be expected to be broadly applicable to stabilization of emulsions and foams.
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Affiliation(s)
- Lynn M Foster
- McKetta Department of Chemical Engineering and ‡Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712-0231, United States
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39
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Kini GC, Yu J, Wang L, Kan AT, Biswal SL, Tour JM, Tomson MB, Wong MS. Salt- and temperature-stable quantum dot nanoparticles for porous media flow. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.11.042] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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40
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Nap RJ, Park Y, Wong JY, Szleifer I. Adsorption of acid and polymer coated nanoparticles: a statistical thermodynamics approach. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:14482-14493. [PMID: 24143965 DOI: 10.1021/la403143a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
A molecular theoretical description is developed to describe the adsorption of nanoparticles (NPs) that are coated with polymers and functionalized with (surface) acid groups. Results are presented for the adsorption onto both negatively and positively charged surfaces as a function of pH and salt concentration, polymer coating, and NP size. An important finding is that nanoparticles that are coated with weak charge regulating acid molecules such as citric acid develop an asymmetric charge distribution close to a charged surface, due to their finite size. Depending on the sign of the surface charge of the adsorbing surface, a nanoparticle close to the surface either gains more charge or loses charge compared to its "bulk" degree of charge. This in turn influences the amount of NPs that adsorb. The effect of adsorption of negatively charged NPs onto a positively charged surface shows a nonmonotonical variation with pH. The described charging mechanism reveals that details such as size of the NP and acid distribution on the NP need to be considered to provide an accurate understanding of the adsorption process.
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Affiliation(s)
- Rikkert J Nap
- Department of Biomedical Engineering, Department of Chemistry, and Chemistry of Life Processes Institute, Northwestern University , 2145 Sheridan Road, Evanston, Illinois 60208-3100, United States
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