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Surface characterisation reveals substrate suitability for cyanobacterial phototaxis. Acta Biomater 2023; 155:386-399. [PMID: 36280031 DOI: 10.1016/j.actbio.2022.10.035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 09/24/2022] [Accepted: 10/17/2022] [Indexed: 02/02/2023]
Abstract
Cyanobacteria respond to light stimulation, activating localised assembly of type IV pili for motility. The resulting phototactic response is highly dependent on the nature of the incoming light stimulus, and the final motility parameters depend on the surface properties. Conventionally, phototaxis studies are carried out on hydrogel surfaces, such as agarose, with surface properties that vary in time due to experimental conditions. This study considers five substrates, widely utilized in microfluidic technology, to identify the most suitable alternative for performing reliable and repeatable phototaxis assays. The surfaces are characterised via a contact angle goniometer to determine the surface energy, white light interferometry for roughness, zeta-potentials and AFM force distance curves for charge patterns, and XPS for surface composition. Cell motility assays showed 1.25 times increment on surfaces with a water contact angle of 80° compared to a reference glass surface. To prove that motility can be enhanced, polydimethylsiloxane (PDMS) surfaces were plasma treated to alter their surface wettability. The motility on the plasma-treated PDMS showed similar performance as for glass surfaces. In contrast, untreated PDMS surfaces displayed close to zero motility. We also describe the force interactions of cells with the test surfaces using DLVO (Derjaguin-Landau-Verwey-Overbeek) and XDLVO (extended DLVO) theories. The computed DLVO/XDLVO force-distance curves are compared with those obtained using atomic force microscopy. Our findings show that twitching motility on tested surfaces can be described mainly from adhesive forces and hydrophobicity/hydrophilicity surface properties. STATEMENT OF SIGNIFICANCE: The current article focuses on unravelling the potential Micro-Electro-Mechanical System (MEMS) compatible surfaces for studying phototactic twitching motility of cyanobacteria. This is the first exhaustive surface characterization study coupled with phototaxis experiments, to understand the forces contributing to twitching motility. The methods shown in this paper can be further extended to study other surfaces and also to other bacteria exhibiting twitching motility.
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Singh N, Khandelwal N, Tiwari E, Naskar N, Lahiri S, Lützenkirchen J, Darbha GK. Interaction of metal oxide nanoparticles with microplastics: Impact of weathering under riverine conditions. WATER RESEARCH 2021; 189:116622. [PMID: 33227610 DOI: 10.1016/j.watres.2020.116622] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 10/31/2020] [Accepted: 11/07/2020] [Indexed: 05/05/2023]
Abstract
The ubiquitous distribution of microplastics (MPs) leads to inevitable interactions with the toxic pollutants present in the environment including metal-oxide nanoparticles. This study investigates the interaction of CeO2 nanoparticles (CeNPs) with MPs generated from a disposable plastic container. Further, rough MPs (R-MPs), generated through mechanical abrasion of MPs with sand, were used to probe the impact of roughness. To understand the sorption kinetics and underlying interaction processes, batch experiments were carried out. The results distinctly indicate that CeNPs sorption occurred on MPs surfaces and was consistent with the pseudo-second order kinetics model. For pristine MPs, the sorption capacity was as high as 12.9 mg/g while for R-MPs kinetic equilibrium was achieved faster and an enhanced sorption capacity (13.4 mg/g) was identified. A rise in sorption with an increase in salinity was noted while pH and humic acid exhibited a negative correlation. The observed interactions were attributed to the aggregation profile and surface charge of CeNPs and MPs. Surprisingly, CeNPs also got loaded onto MPs in non-agitated and undisturbed conditions. The sorption process was influenced by the type of aqueous matrix and the sorption capacity at equilibrium followed the trend: distilled water> synthetic freshwater> river water. FTIR spectra, zeta potential, SEM imaging, and elemental mapping revealed electrostatic interaction as the dominant mechanism. This work contributes towards the knowledge gap on the environmental risk of MPs.
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Affiliation(s)
- Nisha Singh
- Environmental Nanoscience Laboratory, Department of Earth Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, 741246, India
| | - Nitin Khandelwal
- Environmental Nanoscience Laboratory, Department of Earth Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, 741246, India
| | - Ekta Tiwari
- Environmental Nanoscience Laboratory, Department of Earth Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, 741246, India
| | - Nabanita Naskar
- Chemical Sciences Division, Saha Institute of Nuclear Physics- Kolkata, West Bengal, 700019, India
| | - Susanta Lahiri
- Chemical Sciences Division, Saha Institute of Nuclear Physics- Kolkata, West Bengal, 700019, India
| | - Johannes Lützenkirchen
- Institute of Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
| | - Gopala Krishna Darbha
- Environmental Nanoscience Laboratory, Department of Earth Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, 741246, India; Centre for Climate and Environmental Studies, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal, 741246, India.
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Boinovich LB, Kaminsky VV, Domantovsky AG, Emelyanenko KA, Aleshkin AV, Zulkarneev ER, Kiseleva IA, Emelyanenko AM. Bactericidal Activity of Superhydrophobic and Superhydrophilic Copper in Bacterial Dispersions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2019; 35:2832-2841. [PMID: 30685974 DOI: 10.1021/acs.langmuir.8b03817] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A method based on nanosecond laser processing was used to design superhydrophilic and superhydrophobic copper substrates. Three different protocols were used to analyze the evolution of the bactericidal activity of the copper substrates with different wettability. Scanning electron microscopy was used to study the variation of cell morphology after the attachment to superhydrophilic and superhydrophobic surfaces. The dispersions of Escherichia coli K12 C600 and Klebsiella pneumoniae 811 in Luria Bertani broth in contact with the superhydrophilic copper surface showed enhanced bacterial inactivation, associated with toxic action of both hierarchically textured copper surface and high content of Cu2+ ions in the dispersion medium. In contrast, the bacterial dispersions in contact with the superhydrophobic copper substrates demonstrated an increase in cell concentration with time until the development of corrosion processes. The resistance of bacterial cells to contact the copper substrates is discussed on the basis of surface forces, determining the primary adhesion and of the protective action of a superhydrophobic state of the surface against electrochemical and biological corrosion.
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Affiliation(s)
- Ludmila B Boinovich
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry , Russian Academy of Sciences , Leninsky prospect 31 bldg. 4 , 119071 Moscow , Russia
| | - Valery V Kaminsky
- G. N. Gabrichevsky Research Institute for Epidemiology and Microbiology , 10 Admiral Makarov Street , 125212 Moscow , Russia
| | - Alexandr G Domantovsky
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry , Russian Academy of Sciences , Leninsky prospect 31 bldg. 4 , 119071 Moscow , Russia
| | - Kirill A Emelyanenko
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry , Russian Academy of Sciences , Leninsky prospect 31 bldg. 4 , 119071 Moscow , Russia
| | - Andrey V Aleshkin
- G. N. Gabrichevsky Research Institute for Epidemiology and Microbiology , 10 Admiral Makarov Street , 125212 Moscow , Russia
| | - Eldar R Zulkarneev
- G. N. Gabrichevsky Research Institute for Epidemiology and Microbiology , 10 Admiral Makarov Street , 125212 Moscow , Russia
| | - Irina A Kiseleva
- G. N. Gabrichevsky Research Institute for Epidemiology and Microbiology , 10 Admiral Makarov Street , 125212 Moscow , Russia
| | - Alexandre M Emelyanenko
- A.N. Frumkin Institute of Physical Chemistry and Electrochemistry , Russian Academy of Sciences , Leninsky prospect 31 bldg. 4 , 119071 Moscow , Russia
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Lützenkirchen J, Scharnweber T, Ho T, Striolo A, Sulpizi M, Abdelmonem A. A set-up for simultaneous measurement of second harmonic generation and streaming potential and some test applications. J Colloid Interface Sci 2018; 529:294-305. [DOI: 10.1016/j.jcis.2018.06.017] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 05/28/2018] [Accepted: 06/06/2018] [Indexed: 10/28/2022]
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Boinovich LB, Sobolev VD, Maslakov KI, Domantovsky AG, Sergeeva IP, Emelyanenko AM. Cation capture and overcharging of a hydrophobized quartz surface in concentrated potassium chloride solutions. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.10.023] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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Cui X, Shi C, Zhang S, Xie L, Liu J, Jiang D, Zeng H. Probing the Effect of Salinity and pH on Surface Interactions between Air Bubbles and Hydrophobic Solids: Implications for Colloidal Assembly at Air/Water Interfaces. Chem Asian J 2017; 12:1568-1577. [DOI: 10.1002/asia.201700388] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 03/31/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Xin Cui
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
| | - Chen Shi
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
| | - Shuo Zhang
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
| | - Lei Xie
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
| | - Jing Liu
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
| | - Dazhi Jiang
- Department of Materials and Engineering; National University of Defence Technology; Changsha 410073 P.R. China
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering; University of Alberta; Edmonton Alberta T6G 1H9 Canada
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Huang J, Liu X, Qiu X, Xie L, Yan B, Wang X, Huang Q, Zeng H. Octadecyltrichlorosilane Deposition on Mica Surfaces: Insights into the Interface Interaction Mechanism. J Phys Chem B 2017; 121:3151-3161. [DOI: 10.1021/acs.jpcb.7b00828] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jun Huang
- Department
of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9
| | - Xiaokong Liu
- Department
of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9
| | - Xiaoyong Qiu
- Department
of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9
| | - Lei Xie
- Department
of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9
| | - Bin Yan
- Department
of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9
| | - Xiaogang Wang
- School of Material Science & Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Qingxue Huang
- School of Material Science & Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Hongbo Zeng
- Department
of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, Canada T6G 1H9
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Stoll M, Huber FM, Darbha GK, Schill E, Schäfer T. Impact of gravity, collector surface roughness and fracture orientation on colloid retention kinetics in an artificial fracture. J Colloid Interface Sci 2016; 475:171-183. [PMID: 27174623 DOI: 10.1016/j.jcis.2016.04.045] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Revised: 04/27/2016] [Accepted: 04/27/2016] [Indexed: 11/25/2022]
Abstract
The interaction of monodisperse fluorescent carboxylated polystyrene colloids (25nm and 1000nm diameter) with a cut granodiorite surface (Grimsel granodiorite; Switzerland) and with acrylic glass is investigated both experimentally and numerically. Colloid transport experiments are conducted in a parallel plate type fracture flow cell with an aperture of 0.75mm at pH5 under low ionic strength (1mM NaCl) and under laminar flow (7mL/h) conditions. The study focuses on the effect of residence time, colloid size, collector material and fracture orientation on colloid retention. Long colloid residence times are achieved by stop-flow experiments. Using atomic force microscopy and, more specifically, the colloid probe technique surface roughness and force distance information of the collector material (granodiorite or acrylic glass) as a function of probe size (cantilever) are obtained. The experiments are modeled using COMSOL Multiphysics® (2-D numerical simulations). The experimental and the modeled results lead to the conclusion that large colloids (1000nm diameter) undergo sedimentation and deposition on the surface during stop-flow. Collector interaction is not affected by the surface roughness variation. Contrariwise, for the investigated 25nm colloids sedimentation does not play a role under the experimental conditions and collector interaction is triggered by surface inhomogeneities such as surface roughness.
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Affiliation(s)
- M Stoll
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe, Germany.
| | - F M Huber
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe, Germany
| | - G K Darbha
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe, Germany; National Institute of Technology, Tadepalligudem, Andhra Pradesh, 534101, India
| | - E Schill
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe, Germany
| | - T Schäfer
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, 76021 Karlsruhe, Germany; Karlsruhe Institute of Technology (KIT), Institute of Applied Geosciences (AGW), Environmental Geology, Karlsruhe, Germany
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Slavchov RI, Peshkova TV. Adsorption of ions at the interface oil|aqueous electrolyte and at interfaces with adsorbed alcohol. J Colloid Interface Sci 2014; 428:257-66. [PMID: 24910061 DOI: 10.1016/j.jcis.2014.04.063] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2014] [Revised: 04/26/2014] [Accepted: 04/28/2014] [Indexed: 10/25/2022]
Abstract
We investigate the applicability of the Schmutzer's model for three types of interfaces: aqueous electrolyte|alkane, aqueous electrolyte|long chained alcohol phase, and aqueous electrolyte|alkane with adsorbed alcohol. The model predicts a strong decrease of the electrolyte desorption at water|alcohol interface in comparison with water|alkane, in quantitative agreement with the tensiometric data. The effect is related to the penetration of the alcohol -OH group into the surface layer of the aqueous solution. The same model predicts a decrease with the electrolyte concentration of the chemical potential of the alcohol molecules adsorbed at the water|oil interface, which results in an increase of the adsorption activity of oil-soluble alcohols, again in quantitative agreement with the experiment. The analysis of the deviations of Schmutzer's model predictions from the experimental data for large polarizable anions allows making qualitative conclusions for the magnitude of the ion-specific hydrophobic and dispersion forces at water|gas and water|oil interfaces.
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