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Jing X, Zhang Y, Li M, Zuo X, Fan C, Zheng J. Surface engineering of colloidal nanoparticles. MATERIALS HORIZONS 2023; 10:1185-1209. [PMID: 36748345 DOI: 10.1039/d2mh01512a] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Synthesis of engineered colloidal nanoparticles (NPs) with delicate surface characteristics leads to well-defined physicochemical properties and contributes to multifunctional applications. Surface engineering of colloidal NPs can improve their stability in diverse solvents by inhibiting the interparticle attractive forces, thus providing a prerequisite for further particle manipulation, fabrication of the following materials and biological applications. During the last decades, surface engineering methods for colloidal NPs have been well-developed by numerous researchers. However, accurate control of surface properties is still an important topic. The emerging DNA/protein nanotechnology offers additional possibility of surface modification of NPs and programmable particle self-assembly. Here, we first briefly review the recent progress in surface engineering of colloidal NPs, focusing on the improved stability by grafting suitable small molecules, polymers or biological macromolecules. We then present the practical strategies for nucleic acid surface encoding of NPs and subsequent programmable assembly. Various exciting applications of these unique materials are summarized with a specific focus on the cellular uptake, bio-toxicity, imaging and diagnosis of colloidal NPs in vivo. With the growing interest in colloidal NPs in nano-biological research, we expect that this review can play an instructive role in engineering the surface properties for desired applications.
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Affiliation(s)
- Xinxin Jing
- Department of Urology, Institute of Molecular Medicine, Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China.
| | - Yueyue Zhang
- Department of Urology, Institute of Molecular Medicine, Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China.
| | - Min Li
- Department of Urology, Institute of Molecular Medicine, Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China.
| | - Xiaolei Zuo
- Department of Urology, Institute of Molecular Medicine, Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China.
- School of Chemistry and Chemical Engineering, Zhangjiang Institute for Advanced Study, Frontiers Science Center for Transformative Molecules and National Center for Translational Medicine, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Chunhai Fan
- School of Chemistry and Chemical Engineering, Zhangjiang Institute for Advanced Study, Frontiers Science Center for Transformative Molecules and National Center for Translational Medicine, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Junhua Zheng
- Department of Urology, Institute of Molecular Medicine, Shanghai Key Laboratory for Nucleic Acid Chemistry and Nanomedicine, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, 200127, China.
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Chin JY, Teoh GH, Ahmad AL, Low SC. Slippery membrane surface tuning with polypropylene coating to treat real aquaculture wastewater in membrane distillation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 794:148657. [PMID: 34198076 DOI: 10.1016/j.scitotenv.2021.148657] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 06/20/2021] [Accepted: 06/21/2021] [Indexed: 06/13/2023]
Abstract
Surging growth of aquaculture industry has alarmed the public when the wastewater discharged had an adverse effect on the environment. This current study is a pioneer in the use of membrane distillation (MD) to treat real aquaculture wastewater. In addition to excellent hydrophobicity, the slippery surface of membrane used for MD is another key factor that enhances the performance of MD. The slippery surface of the membrane was tuned by layering high-viscosity and low-viscosity polypropylene (PP) polymers on the electrospun membrane by solvent-exchanged method. While the high-viscosity PP coating (PP/HV) rendered the membrane surface slippery, the low-viscosity PP coating (PP/LV) caused the fish farm wastewater to have stick-slip movement on the membrane surface. In the long-term 70-hour direct contact membrane distillation (DCMD) separation, PP/HV and PP/LV membranes can perfectly eliminate the undesirable components in the fish farm wastewater. The PP/HV membrane has registered a flux of 19.1 kg/m2·h, while the flux of PP/LV membrane was only 7.3 kg/m2·h. The PP/HV membrane also showed excellent anti-scaling properties in relative to the PP/LV membrane. This is because the PP/HV membrane promotes effortless gliding of the feed water along the surface of the membrane, while the surface of the PP/LV membrane has a static water boundary. Therefore, it can be concluded that the application of MD using the membrane coated with high-viscosity PP polymer is a feasible technology for the treatment of aquaculture wastewater.
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Affiliation(s)
- Jing Yi Chin
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia.
| | - Guang Hui Teoh
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia.
| | - Abdul Latif Ahmad
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia.
| | - Siew Chun Low
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, Seri Ampangan, 14300 Nibong Tebal, Pulau Pinang, Malaysia.
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Habra K, McArdle SEB, Morris RH, Cave GWV. Synthesis and Functionalisation of Superparamagnetic Nano-Rods towards the Treatment of Glioblastoma Brain Tumours. NANOMATERIALS 2021; 11:nano11092157. [PMID: 34578472 PMCID: PMC8472662 DOI: 10.3390/nano11092157] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 08/06/2021] [Accepted: 08/12/2021] [Indexed: 12/28/2022]
Abstract
The complete removal of glioblastoma brain tumours is impossible to achieve by surgery alone due to the complex finger-like tentacle structure of the tumour cells and their migration away from the bulk of the tumour at the time of surgery; furthermore, despite aggressive chemotherapy and radiotherapy treatments following surgery, tumour cells continue to grow, leading to the death of patients within 15 months after diagnosis. The naturally occurring carnosine dipeptide has previously demonstrated activity against in vitro cultured glioblastoma cells; however, at natural physiological concentrations, its activity is too low to have a significant effect. Towards realising the full oncological potential of carnosine, the dipeptide was embedded within an externally triggered carrier, comprising a novel nano rod-shaped superparamagnetic iron oxide nanoparticle (ca. 86 × 19 × 11 nm) capped with a branched polyethyleneimine, which released the therapeutic agent in the presence of an external magnetic field. The new nano-carrier was characterized using electron microscopy, dynamic light scattering, elemental analysis, and magnetic resonance imaging techniques. In addition to cytotoxicity studies, the carnosine carrier’s effectiveness as a treatment for glioblastoma was screened in vitro using the U87 human glioblastoma astrocytoma cell line. The labile carnosine (100 mM) suppresses both the U87 cells’ proliferation and mobility over 48 h, resulting in significant reduction in migration and potential metastasis. Carnosine was found to be fully released from the carrier using only mild hyperthermia conditions (40 °C), facilitating an achievable clinical application of the slow, sustained-release treatment of glioblastoma brain tumours that demonstrates potential to inhibit post-surgery metastasis with the added benefit of non-invasive monitoring via MRI.
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Affiliation(s)
- Kinana Habra
- School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK; (K.H.); (R.H.M.)
| | - Stéphanie E. B. McArdle
- John van Geest Cancer Research Centre, School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK;
| | - Robert H. Morris
- School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK; (K.H.); (R.H.M.)
| | - Gareth W. V. Cave
- School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, UK; (K.H.); (R.H.M.)
- Correspondence: ; Tel.: +44-115-84-83242
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Kücük Ş, Hejase CA, Kolesnyk IS, Chew JW, Tarabara VV. Microfiltration of saline crude oil emulsions: Effects of dispersant and salinity. JOURNAL OF HAZARDOUS MATERIALS 2021; 412:124747. [PMID: 33951851 DOI: 10.1016/j.jhazmat.2020.124747] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 11/18/2020] [Accepted: 11/28/2020] [Indexed: 06/12/2023]
Abstract
Dispersants reduce oil-water interfacial tension making the separation of oil-water emulsions challenging. In this study, crude oil stabilized by the dispersant, Corexit EC9500A, was emulsified in synthetic sea water using a range of Corexit/crude oil concentration ratios (up to 10% by volume). With an interfacial tension of only 8.0 mJ/m2 at 0.5 mL(Corexit)/L, approximately 50% of the crude was dispersed into droplets <10 µm. Near complete rejection of oil in crossflow separation tests was accompanied by a precipitous flux decline attributable in part to dispersant- and salinity-induced decrease in membrane's oleophobicity (4.2 mJ/m2 decrease in surface energy). Screening of electrostatic interactions prompted oil coalescence that occurred at the membrane surface but not in the bulk of the emulsion. Real-time in situ visualization by Direct Observation Through Membrane gave direct evidence of surface coalescence pointing to both its detrimental effects (spread of contiguous films) and possible advantages (removal of large droplets by crossflow shear).
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Affiliation(s)
- Şeyma Kücük
- Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, USA.
| | - Charifa A Hejase
- Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, USA.
| | - Iryna S Kolesnyk
- Department of Chemistry, National University of Kyiv-Mohyla Academy, Kyiv 04070, Ukraine.
| | - Jia Wei Chew
- School of Chemical and Biomedical Engineering, Nanyang Technological University, 637459, Singapore; Singapore Membrane Technology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 637141, Singapore.
| | - Volodymyr V Tarabara
- Department of Civil and Environmental Engineering, Michigan State University, East Lansing, MI 48824, USA.
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Synthesis, Characterization and Stability of Gold Nanoparticles (AuNPs) in Different Buffer Systems. J CLUST SCI 2021. [DOI: 10.1007/s10876-020-01956-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Hirano M, Yamane M, Ohtsu N. Effects of discharge mode and gas composition for plasma‐hydrophilized titanium surface on hydrophilic sustainability. SURF INTERFACE ANAL 2020. [DOI: 10.1002/sia.6880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Mitsuhiro Hirano
- School of Earth, Energy and Environmental Engineering Kitami Institute of Technology Kitami Japan
| | - Misao Yamane
- School of Earth, Energy and Environmental Engineering Kitami Institute of Technology Kitami Japan
| | - Naofumi Ohtsu
- School of Earth, Energy and Environmental Engineering Kitami Institute of Technology Kitami Japan
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Ding H, Rahman S. Experimental and theoretical study of wettability alteration during low salinity water flooding-an state of the art review. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.02.006] [Citation(s) in RCA: 99] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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8
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Moore TL, Rodriguez-Lorenzo L, Hirsch V, Balog S, Urban D, Jud C, Rothen-Rutishauser B, Lattuada M, Petri-Fink A. Nanoparticle colloidal stability in cell culture media and impact on cellular interactions. Chem Soc Rev 2015; 44:6287-6305. [PMID: 26056687 DOI: 10.1039/c4cs00487f] [Citation(s) in RCA: 641] [Impact Index Per Article: 71.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Nanomaterials are finding increasing use for biomedical applications such as imaging, diagnostics, and drug delivery. While it is well understood that nanoparticle (NP) physico-chemical properties can dictate biological responses and interactions, it has been difficult to outline a unifying framework to directly link NP properties to expected in vitro and in vivo outcomes. When introduced to complex biological media containing electrolytes, proteins, lipids, etc., nanoparticles (NPs) are subjected to a range of forces which determine their behavior in this environment. One aspect of NP behavior in biological systems that is often understated or overlooked is aggregation. NP aggregation will significantly alter in vitro behavior (dosimetry, NP uptake, cytotoxicity), as well as in vivo fate (pharmacokinetics, toxicity, biodistribution). Thus, understanding the factors driving NP colloidal stability and aggregation is paramount. Furthermore, studying biological interactions with NPs at the nanoscale level requires an interdisciplinary effort with a robust understanding of multiple characterization techniques. This review examines the factors that determine NP colloidal stability, the various efforts to stabilize NP in biological media, the methods to characterize NP colloidal stability in situ, and provides a discussion regarding NP interactions with cells.
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Affiliation(s)
- Thomas L Moore
- Adolphe Merkle Institute, University of Fribourg, 1700 Fribourg, Switzerland.
| | | | - Vera Hirsch
- Adolphe Merkle Institute, University of Fribourg, 1700 Fribourg, Switzerland.
| | - Sandor Balog
- Adolphe Merkle Institute, University of Fribourg, 1700 Fribourg, Switzerland.
| | - Dominic Urban
- Adolphe Merkle Institute, University of Fribourg, 1700 Fribourg, Switzerland.
| | - Corinne Jud
- Adolphe Merkle Institute, University of Fribourg, 1700 Fribourg, Switzerland.
| | | | - Marco Lattuada
- Adolphe Merkle Institute, University of Fribourg, 1700 Fribourg, Switzerland.
| | - Alke Petri-Fink
- Adolphe Merkle Institute, University of Fribourg, 1700 Fribourg, Switzerland.
- Chemistry Department, University of Fribourg, 1700 Fribourg, Switzerland.
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9
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Experimental studies of contact angle hysteresis phenomena on polymer surfaces – Toward the understanding and control of wettability for different applications. Adv Colloid Interface Sci 2015; 222:350-76. [PMID: 25488284 DOI: 10.1016/j.cis.2014.10.012] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 10/22/2014] [Accepted: 10/30/2014] [Indexed: 11/23/2022]
Abstract
Contact angle hysteresis phenomena on polymer surfaces have been studied by contact angle measurements using sessile liquid droplets and captive air bubbles in conjunction with a drop shape method known as Axisymmetric Drop Shape Analysis - Profile (ADSA-P). In addition, commercially available sessile drop goniometer techniques were used. The polymer surfaces were characterized with respect to their surface structure (morphology, roughness, swelling) and surface chemistry (elemental surface composition, acid-base characteristics) by scanning electron microscopy (SEM), scanning force microscopy (SFM), ellipsometry, X-ray photoelectron spectroscopy (XPS) and streaming potential measurements. Heterogeneous polymer surfaces with controlled roughness and chemical composition were prepared by different routes using plasma etching and subsequent dip coating or grafting of polymer brushes, anodic oxidation of aluminium substrates coated with thin polymer films, deposition techniques to create regular patterned and rough fractal surfaces from core-shell particles, and block copolymers. To reveal the effects of swelling and reorientation at the solid/liquid interface contact angle hysteresis phenomena on polyimide surfaces, cellulose membranes, and thermo-responsive hydrogels have been studied. The effect of different solutes in the liquid (electrolytes, surfactants) and their impact on contact angle hysteresis were characterized for solid polymers without and with ionizable functional surface groups in aqueous electrolyte solutions of different ion concentrations and pH and for photoresist surfaces in cationic aqueous surfactant solutions. The work is an attempt toward the understanding of contact angle hysteresis phenomena on polymer surfaces aimed at the control of wettability for different applications.
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Fernandez-Martinez A, Hu Y, Lee B, Jun YS, Waychunas GA. In situ determination of interfacial energies between heterogeneously nucleated CaCO3 and quartz substrates: thermodynamics of CO2 mineral trapping. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:102-109. [PMID: 22646799 DOI: 10.1021/es3014826] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
The precipitation of carbonate minerals--mineral trapping--is considered one of the safest sequestration mechanisms ensuring long-term geologic storage of CO(2). However, little is known about the thermodynamic factors controlling the extent of heterogeneous nucleation at mineral surfaces exposed to the fluids in porous reservoirs. The goal of this study is to determine the thermodynamic factors controlling heterogeneous nucleation of carbonate minerals on pristine quartz (100) surfaces, which are assumed representative of sandstone reservoirs. To probe CaCO(3) nucleation on quartz (100) in solution and with nanoscale resolution, an in situ grazing incidence small-angle X-ray scattering technique has been utilized. With this method, a value of α' = 36 ± 5 mJ/m(2) for the effective interfacial free energy governing heterogeneous nucleation of CaCO(3) has been obtained by measuring nucleation rates at different solution supersaturations. This value is lower than the interfacial energy governing calcite homogeneous nucleation (α ≈ 120 mJ/m(2)), suggesting that heterogeneous nucleation of calcium carbonate is favored on quartz (100) at ambient pressure and temperature conditions, with nucleation barriers between 2.5% and 15% lower than those expected for homogeneous nucleation. These observations yield important quantitative parameters readily usable in reactive transport models of nucleation at the reservoir scale.
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Affiliation(s)
- Alejandro Fernandez-Martinez
- Earth Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States
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11
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Tiraferri A, Kang Y, Giannelis EP, Elimelech M. Highly hydrophilic thin-film composite forward osmosis membranes functionalized with surface-tailored nanoparticles. ACS APPLIED MATERIALS & INTERFACES 2012; 4:5044-53. [PMID: 22948042 DOI: 10.1021/am301532g] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Thin-film composite polyamide membranes are state-of-the-art materials for membrane-based water purification and desalination processes, which require both high rejection of contaminants and high water permeabilities. However, these membranes are prone to fouling when processing natural waters and wastewaters, because of the inherent surface physicochemical properties of polyamides. The present work demonstrates the fabrication of forward osmosis polyamide membranes with optimized surface properties via facile and scalable functionalization with fine-tuned nanoparticles. Silica nanoparticles are coated with superhydrophilic ligands possessing functional groups that impart stability to the nanoparticles and bind irreversibly to the native carboxyl moieties on the membrane selective layer. The tightly tethered layer of nanoparticles tailors the surface chemistry of the novel composite membrane without altering the morphology or water/solute permeabilities of the membrane selective layer. Surface characterization and interfacial energy analysis confirm that highly hydrophilic and wettable membrane surfaces are successfully attained. Lower intermolecular adhesion forces are measured between the new membrane materials and model organic foulants, indicating the presence of a bound hydration layer at the polyamide membrane surface that creates a barrier for foulant adhesion.
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Affiliation(s)
- Alberto Tiraferri
- Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06520-8286, USA
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12
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Zhang W, Isaacson CW, Rattanaudompol US, Powell TB, Bouchard D. Fullerene nanoparticles exhibit greater retention in freshwater sediment than in model porous media. WATER RESEARCH 2012; 46:2992-3004. [PMID: 22445188 DOI: 10.1016/j.watres.2012.02.049] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2011] [Revised: 02/21/2012] [Accepted: 02/29/2012] [Indexed: 05/31/2023]
Abstract
Increasing production and use of fullerene-based nanomaterials underscore the need to determine their mobility in environmental transport pathways and potential ecological exposures. This study investigated the transport of two fullerenes (i.e., aqu/C(60) and water-soluble C(60) pyrrolidine tris-acid [C(60) PTA]) in columns packed with model porous media (Iota quartz and Ottawa sand) and a sediment from Call's creek under saturated and unsaturated steady-state flows. The fullerenes had the least retention in Iota quartz, and the greatest retention in the sediment at near neutral pH, correlating with the degree of grain surface chemical heterogeneity (e.g., amorphous Al hydroxides concentration increasing in the order of Iota quartz<Ottawa sand<sediment). Surface roughness was elucidated as another important factor responsible for the greatest fullerene retention in the sediment. In accordance with the XDLVO energy calculations, C(60) PTA was less retained than aqu/C(60) at near neutral pH, due to its greater hydrophilicity measured by tolune-water partition coefficient, as well as smaller particle sizes revealed by atomic force microscopy. Fullerene retention exhibited a strong dependency on solution pH that could be explained partly by the pH-dependent surface charge of fullerenes and grain surface, and partly by increased hydrophobicity of C(60) PTA when solution pH approaches its isoelectric point (IEP). Finally, fullerene retention was enhanced in unsaturated media, implying that fullerenes may be more attenuated in the vadose zone than in groundwater.
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Affiliation(s)
- Wei Zhang
- Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824, USA.
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13
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Guillen GR, Pan Y, Li M, Hoek EMV. Preparation and Characterization of Membranes Formed by Nonsolvent Induced Phase Separation: A Review. Ind Eng Chem Res 2011. [DOI: 10.1021/ie101928r] [Citation(s) in RCA: 899] [Impact Index Per Article: 69.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Gregory R. Guillen
- Department of Civil and Environmental Engineering, California NanoSystems Institute, University of California, Los Angeles, California 90095, United States
| | - Yinjin Pan
- Department of Civil and Environmental Engineering, California NanoSystems Institute, University of California, Los Angeles, California 90095, United States
| | - Minghua Li
- Department of Civil and Environmental Engineering, California NanoSystems Institute, University of California, Los Angeles, California 90095, United States
| | - Eric M. V. Hoek
- Department of Civil and Environmental Engineering, California NanoSystems Institute, University of California, Los Angeles, California 90095, United States
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14
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Surface energetics to assess biomass attachment onto immobilized metal-ion chromatography adsorbents in expanded beds. BIOTECHNOL BIOPROC E 2009. [DOI: 10.1007/s12257-008-0172-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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15
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Vennapusa RR, Tari C, Cabrera R, Fernandez-Lahore M. Surface energetics to assess biomass attachment onto hydrophobic interaction adsorbents in expanded beds. Biochem Eng J 2009. [DOI: 10.1016/j.bej.2008.08.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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16
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Patete J, Petrofsky JM, Stepan J, Waheed A, Serafin JM. Hofmeister Effect on the Interfacial Free Energy of Aliphatic and Aromatic Surfaces Studied by Chemical Force Microscopy. J Phys Chem B 2008; 113:583-8. [DOI: 10.1021/jp807876s] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Jonathan Patete
- Department of Chemistry, St. John’s University, 8000 Utopia Parkway, Jamaica, New York 11439
| | - John M. Petrofsky
- Department of Chemistry, St. John’s University, 8000 Utopia Parkway, Jamaica, New York 11439
| | - Jeffery Stepan
- Department of Chemistry, St. John’s University, 8000 Utopia Parkway, Jamaica, New York 11439
| | - Abdul Waheed
- Department of Chemistry, St. John’s University, 8000 Utopia Parkway, Jamaica, New York 11439
| | - Joseph M. Serafin
- Department of Chemistry, St. John’s University, 8000 Utopia Parkway, Jamaica, New York 11439
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17
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Contact angles of diiodomethane on silicon-doped diamond-like carbon coatings in electrolyte solutions. J Colloid Interface Sci 2008; 326:329-32. [DOI: 10.1016/j.jcis.2008.06.045] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2008] [Revised: 06/23/2008] [Accepted: 06/25/2008] [Indexed: 11/17/2022]
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18
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Vennapusa RR, Binner S, Cabrera R, Fernandez-Lahore M. Surface Energetics to Assess Microbial Adhesion onto Fluidized Chromatography Adsorbents. Eng Life Sci 2008. [DOI: 10.1002/elsc.200800027] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Abstract
Numerical simulation of a zero-leakage microvalve is investigated where a liquid droplet is used as a gate to regulate the flow in a T junction. The droplet gate is activated by changing its surface tension via an applied electric field. Numerical simulation of the droplet actuation is considered where the effect of electrowetting is imposed in the form of a modified boundary condition at the contact line. Numerical simulation is used to predict the droplet behavior and to design the valve. It is found that the pressure breakdown of the microvalve is significantly affected by the geometry of the T junction corners. It is expected that such a microvalve design will improve the sensitivity and performance of a wide variety of microfluidic devices.
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Affiliation(s)
- Kamran Mohseni
- Department of Aerospace Engineering Sciences, University of Colorado, Boulder, CO 80309-0429, USA.
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20
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Bergendahl J, Grasso D. Prediction of colloid detachment in a model porous media: Thermodynamics. AIChE J 2006. [DOI: 10.1002/aic.690450305] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Drechsler A, Grundke K. The influence of electrolyte ions on the interaction forces between polystyrene surfaces. Colloids Surf A Physicochem Eng Asp 2005. [DOI: 10.1016/j.colsurfa.2005.05.001] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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22
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Weisbrod N, Niemet MR, Rockhold ML, McGinnis T, Selker JS. Migration of saline solutions in variably saturated porous media. JOURNAL OF CONTAMINANT HYDROLOGY 2004; 72:109-133. [PMID: 15240169 DOI: 10.1016/j.jconhyd.2003.10.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2002] [Revised: 10/01/2003] [Accepted: 10/31/2003] [Indexed: 05/24/2023]
Abstract
Migration of concentrated NaNO3 solutions in homogeneous packs of pre-wetted silica sands was investigated using a light transmission system. Solutions of 5 molal NaNO3 were found to migrate downward 24-62% faster than pure water, in an unstable, fingered manner. This behavior was attributed primarily to a surface tension induced, non-zero apparent contact angle between the imbibing and the resident fluids. For saline solutions of similar surface tension to that of pure water (achieved by the addition of 2% methanol), the migration rates and plume shapes were comparable to that of water, demonstrating that density was not the primary source of the observed differences in migration patterns. At depths where resident saturation increased above residual, the migration process appeared to occur via film flow with slight changes in saturation (<4%), rather than in a series of abrupt jumps, as observed at shallower depths. A method for contact angle scaling was used to illustrate the effects of non-zero contact angles on capillary pressure-saturation curves.
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Affiliation(s)
- Noam Weisbrod
- Department of Environmental Hydrology and Microbiology, Institute for Water Sciences and Technologies, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Sede Boquer Campus 84990, Israel.
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23
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Schwarzer HC, Peukert W. Combined experimental/numerical study on the precipitation of nanoparticles. AIChE J 2004. [DOI: 10.1002/aic.10277] [Citation(s) in RCA: 140] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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24
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McQuain MK, Seale K, Peek J, Levy S, Haselton FR. Effects of relative humidity and buffer additives on the contact printing of microarrays by quill pins. Anal Biochem 2003; 320:281-91. [PMID: 12927835 DOI: 10.1016/s0003-2697(03)00348-8] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
DNA microarrays printed with quill pins exhibit significant variation in probe DNA spots. Interspot variations and nonuniform distribution of probe within spots are major sources of experimental uncertainty in microarray analysis. To gain better insight into the sources of variation, we analyzed 450 consecutive depositions printed at relative humidities between 40 and 80% using three print buffers. Increasing relative humidity improved printing performance by delaying pin failure but did not reduce the variability in spot characteristics. Adding either betaine or dimethyl sulfoxide (DMSO) to the print buffer also improved quill pin performance. Least interspot variation was observed with the DMSO additive printed at 80% relative humidity, but this additive also resulted in the greatest intraspot variation. Least intraspot variation was observed with 1.5M betaine printed at 60% relative humidity, but these conditions produced microarrays with high interspot variability. Evaporation of printing solution from the quill reservoir appeared to be the primary cause of interspot and intraspot variations. Our studies indicate that relative humidity and printing solution additives reduce evaporation. Based on the spot variability requirements for a particular application, humidity and additives may be chosen to optimize either inter- or intraspot variability.
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Affiliation(s)
- Mark K McQuain
- Biomedical Engineering, Vanderbilt University, Nashville, TN 37235, USA
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25
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Maheshwari R, Sreeram K, Dhathathreyan A. Surface energy of aqueous solutions of Hofmeister electrolytes at air/liquid and solid/liquid interface. Chem Phys Lett 2003. [DOI: 10.1016/s0009-2614(03)00859-5] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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26
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Welzel PB, Rauwolf C, Yudin O, Grundke K. Influence of Aqueous Electrolytes on the Wetting Behavior of Hydrophobic Solid Polymers—Low-Rate Dynamic Liquid/Fluid Contact Angle Measurements Using Axisymmetric Drop Shape Analysis. J Colloid Interface Sci 2002; 251:101-8. [PMID: 16290707 DOI: 10.1006/jcis.2002.8356] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2001] [Accepted: 03/15/2002] [Indexed: 11/22/2022]
Abstract
The interaction of inorganic ions with low-energy hydrophobic surfaces was examined using model systems of solid polymers without ionizable functional surface groups in aqueous electrolyte solutions. Low-rate dynamic contact angle measurements with captive bubbles in conjunction with axisymmetric drop shape analysis (ADSA) were performed to study the influence of electrolyte ions (in the aqueous test solutions) on the wettability of the polymers. When various types of ions were used, no significant change in advancing and receding contact angles was observed. The contact angle hysteresis was small. The zeta potential of the model polymers in aqueous electrolyte solutions was determined from streaming potential measurements. The variation of the zeta potential at different pH levels indicates preferential adsorption of hydroxyl ions at this interface. However, the presence of electrolytes at the interface between water and the different model polymers did not influence the macroscopic contact angle. The results may suggest the absence of any specific interaction between the ions and the solid polymer, as this should result in changes of hydrophobicity. Similar to the air/water interface, the composition and the potential of the polymer/water interface are obviously determined predominantly by the aqueous phase with only slight influence from the solid phase.
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Affiliation(s)
- Petra B Welzel
- Institute of Polymer Research Dresden e.V. Hohe Strasse 6, Dresden, D-01069, Germany.
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27
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Chou T. Geometry-dependent electrostatics near contact lines. PHYSICAL REVIEW LETTERS 2001; 87:106101. [PMID: 11531488 DOI: 10.1103/physrevlett.87.106101] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2001] [Indexed: 05/23/2023]
Abstract
Long-ranged electrostatic interactions in electrolytes modify contact angles on charged substrates in a scale and geometry-dependent manner. For angles measured at scales smaller than the typical Debye screening length, the wetting geometry near the contact line must be explicitly considered. Using variational and asymptotic methods, we derive new transcendental equations for the contact angle as functions of the electrostatic potential only at the three phase contact line. Analytic expressions are found in certain limits and compared with predictions for contact angles measured with lower resolution. An estimate for electrostatic contributions to line tension is also given.
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Affiliation(s)
- T Chou
- Department of Biomathematics, UCLA, Los Angeles, California 90095-1766, USA.
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