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Zhang J, Laskar A, Song J, Shklyaev OE, Mou F, Guan J, Balazs AC, Sen A. Light-Powered, Fuel-Free Oscillation, Migration, and Reversible Manipulation of Multiple Cargo Types by Micromotor Swarms. ACS NANO 2023; 17:251-262. [PMID: 36321936 DOI: 10.1021/acsnano.2c07266] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Through experiments and simulations, we show that fuel-free photoactive TiO2 microparticles can form mobile, coherent swarms in the presence of UV light, which track the subsequent movement of an irradiated spot in a fluid-filled microchamber. Multiple concurrent propulsion mechanisms (electrolyte diffusioosmotic swarming, photocatalytic expansion, and photothermal migration) control the rich collective behavior of the swarms, which provide a strategy to reversely manipulate cargo. The active swarms can autonomously pick up groups of inert particles, sort them by size, and sequentially release the sorted particles at particular locations in the microchamber. Hence, these swarms overcome three obstacles, limiting the utility of self-propelled particles. Namely, they can (1) undergo directed, long-range migration without the addition of a chemical fuel, (2) perform diverse collective behavior not possible with a single active particle, and (3) repeatedly and controllably isolate and deliver specific components of a multiparticle "cargo". Since light sources are easily fabricated, transported, and controlled, the results can facilitate the development of portable devices, providing broader access to the diagnostic and manufacturing advances enabled by microfluidics.
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Affiliation(s)
- Jianhua Zhang
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, College of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, China
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Abhrajit Laskar
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Jiaqi Song
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Oleg E Shklyaev
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Fangzhi Mou
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Jianguo Guan
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China
| | - Anna C Balazs
- Department of Chemical Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Ayusman Sen
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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2
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Xie D, Jiang Y, Song B, Yang X. Switchable Pickering foams stabilized by mesoporous nanosilica hydrophobized in situ with a Gemini surfactant. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.119313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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3
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Abida O, Van der Graaf F, Li LY. Exploratory study of removing nutrients from aqueous environments employing a green synthesised nano zero-valent iron. ENVIRONMENTAL TECHNOLOGY 2022; 43:2017-2032. [PMID: 33317431 DOI: 10.1080/09593330.2020.1864480] [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: 09/03/2020] [Accepted: 12/04/2020] [Indexed: 06/12/2023]
Abstract
This study explores the green synthesis of nano zero-valent iron (nZVI) extracted from the peel of selected waste fruits: banana (BP), mango (MP), and pomegranate (GP), for the removal of nutrients from aqueous environments. The extract was prepared by heating de-ionised water at 60°C for 5 min, adding a reducing and a stabilising agent, FeCl3, then stirring with a N2 gas flush solution to form iron nanoparticles, with a final drying step under N2 conditions. Using a variety of characterisation techniques, it was determined that nZVI particles were successfully synthesised via the reduction of iron (III) to iron (0) and stabilised by the presence of phenolic compounds in the extract. The removal of 20 mg/L nutrients from an aqueous solution carried out using the nZVIs resulted in nitrate removal of 92% (nZVI-GP), 88% (nZVI-BP), and 72% (nZVI-MP) within 5 min, whereas ∼98% phosphate was removed by all three nZVIs within 60 min. The aging effect was also tested. Aging the nZVIs for >20 days resulted in less efficient phosphate adsorption after exposure for 250 min; ∼70% phosphate removal was achieved using the nZVIs under these conditions. The mechanisms and pathways of nitrate reduction, including the adsorption of phosphate by nZVI were demonstrated, and discussed. Leachability tests of the phosphate-loaded nZVIs revealed that 10%, 28%, and 48% phosphate was released from the nZVI-GP, nZVI-BP, and nZVI-MP particles, respectively. Using waste fruit is, therefore, a viable and sustainable alternative to the traditional sodium borohydride method to produce nZVIs for environmental application.
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Affiliation(s)
- Otman Abida
- College of Engineering and Technology, American University of Middle East, Kuwait
- Department of Civil Engineering, University of British Columbia, Vancouver, Canada
| | - Fennie Van der Graaf
- Department of Civil Engineering, University of British Columbia, Vancouver, Canada
| | - Loretta Y Li
- Department of Civil Engineering, University of British Columbia, Vancouver, Canada
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Chen M, Wang D, Xu X, Zhang Y, Gui X, Song B, Xu N. Biochar nanoparticles with different pyrolysis temperatures mediate cadmium transport in water-saturated soils: Effects of ionic strength and humic acid. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 806:150668. [PMID: 34597543 DOI: 10.1016/j.scitotenv.2021.150668] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Revised: 08/28/2021] [Accepted: 09/25/2021] [Indexed: 06/13/2023]
Abstract
Biochar is advocated as an environment-friendly and cost-effective material for removing both heavy metals and organic contaminants in soil remediation. However, our understandings on the cotransport potential of contaminants with the nanoscale biochar downward along soil profiles (e.g., potential environmental risks towards groundwater) remain largely unknown. This study investigated the effects of wheat straw-derived biochar nanoparticles pyrolyzed at 350 °C and 500 °C (BNP350 and BNP500) on the transport of cadmium (Cd(II)) in water-saturated soil packed columns. Different ionic strengths (ISs) without/with humic acid (HA) were tested to mimic the scenarios during soil remediation. BNPs could act as a vehicle mediating Cd(II) transport in soils. At a low IS (1.0 mM KCl), compared to the limited transport of individual Cd(II), BNP500 enhanced (69 times) Cd(II) transport (Cd(II) mass recovery (M) = 7.59%) in soils, which was greater than that by BNP350 (54 times, M = 5.92%), likely due to the higher adsorption of Cd(II) onto BNP500. HA further increased the Cd(II) transport by BNPs (M = 8.40% for BNP350 and M = 11.95% for BNP500), which was mainly due to the increased mobility of BNPs carrying more absorbed Cd(II). In contrast, at a high IS (10 mM KCl), BNP500 dramatically inhibited the transport of Cd(II) (M = 12.9%), decreasing by about 61.6%, compared to the BNPs absence (M = 33.6%). This is because a large amount of BNP500-Cd(II) was retained in soils at a high IS. This inhibition effect of Cd(II) transport by BNPs was reinforced with the presence of HA. Our findings suggest that the pyrolysis temperature of biochar should be carefully considered when applying biochar for in-situ remediation of soils contaminated by heavy metals such as Cd(II) under various organic matter and IS conditions.
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Affiliation(s)
- Ming Chen
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Dengjun Wang
- School of Fisheries, Aquaculture and Aquatic Sciences, Auburn University, Auburn, AL 36849, USA
| | - Xiaoyun Xu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Yue Zhang
- Institute of Eco-Environment and Plant Protection, Shanghai Academy of Agricultural Sciences, Shanghai 201403, China
| | - Xiangyang Gui
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Bingqing Song
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Nan Xu
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
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Production of Amorphous Silicon Dioxide Derived from Aluminum Fluoride Industrial Waste and Consideration of the Possibility of Its Use as Al2O3-SiO2 Catalyst Supports. Catalysts 2022. [DOI: 10.3390/catal12020162] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
This paper presents the results of the study on the development of a methodology for the production of pure amorphous silicon dioxide containing up to 99.8 wt.% of SiO2. As a starting material, a silica gel with a moisture content of up to 55 wt.% and an SiO2/AlF3 ratio of 4 was used. The silica gel was purified using alkaline and acidic solutions in concentrations ranging from 0.1 to 25 wt.%. The analysis of the experimental data allowed to identify the most suitable purification parameters of the starting material. The initial silica gel and the reaction products were studied using the methods of X-ray fluorescence, X-ray phase analysis, electron scanning microscopy, EDS microanalysis, and particle-size analysis. Amorphous silicon dioxide obtained according to the methodology developed by the authors forms agglomerates of spherical silicon dioxide particles up to 1 μm in size. Amorphous silicon dioxide was involved in the preparation of catalyst supports in order to consider the possibility of replacing part of the expensive raw material in the form of aluminum hydroxide. In the work, the characteristics of the addition of this amorphous silicon dioxide and the supports obtained from the traditionally used raw materials were evaluated.
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Razavirad F, Shahrabadi A, Babakhani Dehkordi P, Rashidi A. Experimental Pore-Scale Study of a Novel Functionalized Iron-Carbon Nanohybrid for Enhanced Oil Recovery (EOR). NANOMATERIALS (BASEL, SWITZERLAND) 2021; 12:103. [PMID: 35010052 PMCID: PMC8746808 DOI: 10.3390/nano12010103] [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: 11/08/2021] [Revised: 12/24/2021] [Accepted: 12/25/2021] [Indexed: 11/17/2022]
Abstract
Nanofluid flooding, as a new technique to enhance oil recovery, has recently aroused much attention. The current study considers the performance of a novel iron-carbon nanohybrid to EOR. Carbon nanoparticles was synthesized via the hydrothermal method with citric acid and hybridize with iron (Fe3O4). The investigated nanohybrid is characterized by its rheological properties (viscosity), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) analysis. The efficiency of the synthetized nanoparticle in displacing heavy oil is initially assessed using an oil-wet glass micromodel at ambient conditions. Nanofluid samples with various concentrations (0.05 wt % and 0.5 wt %) dispersed in a water base fluid with varied salinities were first prepared. The prepared nanofluids provide high stability with no additive such as polymer or surfactant. Before displacement experiments were run, to achieve a better understanding of fluid-fluid and grain-fluid interactions in porous media, a series of sub-pore scale tests-including interfacial tension (IFT), contact angle, and zeta potential-were conducted. Nanofluid flooding results show that the nanofluid with the medium base fluid salinity and highest nanoparticle concertation provides the highest oil recovery. However, it is observed that increasing the nanofluid concentration from 0.05% to 0.5% provided only three percent more oil. In contrast, the lowest oil recovery resulted from low salinity water flooding. It was also observed that the measured IFT value between nanofluids and crude oil is a function of nanofluid concentration and base fluid salinities, i.e., the IFT values decrease with the increase of nanofluid concentration and base fluid salinity reduction. However, the base fluid salinity enhancement leads to wettability alteration towards more water-wetness. The main mechanisms responsible for oil recovery enhancement during nanofluid flooding is mainly attributed to wettability alteration toward water-wetness and micro-dispersion formation. However, the interfacial tension (IFT) reduction using the iron-carbon nanohybrid is also observed but the reduction is not significant.
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Affiliation(s)
- Fatemeh Razavirad
- Research Institute of Petroleum Industry, Tehran 1485613111, Iran; (A.S.); (P.B.D.); (A.R.)
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Hussain A, Safdar N, Ain NU, Abbasi R, Yasmin A. Litchi chinensis inspired nanoformulations: a synergy guided approach for unraveling promising cytotoxic attributes of metal and nonmetal conjugates. Toxicol Res (Camb) 2021; 10:1187-1201. [PMID: 34956622 DOI: 10.1093/toxres/tfab103] [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: 05/06/2021] [Revised: 09/01/2021] [Accepted: 10/15/2021] [Indexed: 11/12/2022] Open
Abstract
In present study, diverse Litchi chinensis-mediated nanostructures in combination with 5-fluorouracil drug were fabricated viz. Au, Se, Ag, Ag-Se, Ag-Au, 5-FU Ag-Se and 5-FU Ag-Au with subsequent characterization and scrutinization of their anticarcinogenic capabilities. UV-Visible spectroscopic analysis confirmed the state transition for each precursor salt. XRD and transmission electron microscopy analysis revealed spherical/quasispherical nanostructures with monoclinic crystalline organization ranged between 18 nm and 38 nm. FTIR analysis revealed fabricated nanoparticles to be capped with various phytoconstituents. DLS and Zeta potential analysis of unloaded and drug-loaded bielemental nanoparticles (BNPs) showed comparatively large hydrodynamic particle size distribution and sufficient stability of nanoparticles. BNPs showed promising lethality concentrations for brine shrimp (LC50 < 2 μg/ml) and antitumor (LC50 < 10 μg/ml) assessments. These findings were in positive correlation with the antioxidant inhibitory concentrations IC50 (74.2-180.1 μg/ml) of the tested entities. Ag-Se and Ag-Au were loaded with 5-FU (loading efficiency of 47% ± 1.14 and 25% ± 0.32, respectively) in light of their promising cytotoxic actions. All nanostructures showed profound hemocompatibility with maximum hemolytic activity as low as 2.4%. Highly significant difference (P < 0.01) was observed in antineoplastic potentials of unloaded and 5-FU loaded BNPs against HepG2 and HT144, with most substantial IC50 for 5-FU Ag-Au (8.95 ± 2.86 μg/ml). 5-FU Ag-Au was identified as a significant inducer of DNA fragmentation with maximum relative tail moment (HepG2: 3.45 ± 0.21) among all treatments.
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Affiliation(s)
- Amina Hussain
- Microbiology and Biotechnology Research Laboratory, Department of Biotechnology, Fatima Jinnah Women University, Pakistan Old Presidency, The Mall, Rawalpindi 46000, Pakistan
| | - Naila Safdar
- Microbiology and Biotechnology Research Laboratory, Department of Biotechnology, Fatima Jinnah Women University, Pakistan Old Presidency, The Mall, Rawalpindi 46000, Pakistan
| | - Noor-Ul Ain
- Microbiology and Biotechnology Research Laboratory, Department of Biotechnology, Fatima Jinnah Women University, Pakistan Old Presidency, The Mall, Rawalpindi 46000, Pakistan
| | - Rashda Abbasi
- Cancer Biology Institute of Biomedical and Genetic Engineering (IBGE), G-9/1, Islamabad 44000, Pakistan
| | - Azra Yasmin
- Microbiology and Biotechnology Research Laboratory, Department of Biotechnology, Fatima Jinnah Women University, Pakistan Old Presidency, The Mall, Rawalpindi 46000, Pakistan
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8
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Nguyen TQ, Tung KL, Lin YL, Dong CD, Chen CW, Wu CH. Modifying thin-film composite forward osmosis membranes using various SiO 2 nanoparticles for aquaculture wastewater recovery. CHEMOSPHERE 2021; 281:130796. [PMID: 34289641 DOI: 10.1016/j.chemosphere.2021.130796] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 04/16/2021] [Accepted: 04/30/2021] [Indexed: 06/13/2023]
Abstract
This paper describes the fabrication, modification, and evaluation of the performance of thin-film composite (TFC) forward osmosis (FO) membranes for lab-scale aquaculture wastewater recovery using various fumed silica (SiO2) nanoparticles. The active polyamide (PA) layers of these membranes were novelly modified using different types of pretreated SiO2 nanoparticles [virgin SiO2, dried SiO2, and 3-aminopropyltriethoxysilane (APTES)-modified SiO2] and concentrations (0.05, 0,1, 0,2, and 0.4 wt%) to improve the membrane hydrophilicity with minimum particle agglomeration. Results show that the APTES-SiO2 modified membrane had the highest water flux and selectivity, followed by the dried-SiO2 modified membrane. The APTES coupling agent notably reduced the SiO2 aggregation on the membrane surface and improved membrane hydrophilicity. Consequently, high permeate flux and an acceptable reverse solute flux were observed. The optimal SiO2 concentration for PA modification was 0.1 wt% for all the nanoparticle types. The virgin and APTES-SiO2 modified membranes were used for aquaculture wastewater recovery. The water recovery rate reached 47% in 84 h when using the APTES-SiO2 modified membrane, while it reached only 26% in 108 h when using the virgin membrane. With a suitable design of the filtration apparatus and choice of draw solution (DS), the prepared novel TFC-FO membrane containing APTES-modified SiO2 can be used for recycling aquaculture wastewater into the DS, which can then be reused for other purposes.
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Affiliation(s)
- Truc-Quynh Nguyen
- Department of Safety Health and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 824, Taiwan; Department of Forestry and Environmental Engineering, South-Eastern Finland University of Applied Sciences, Mikkeli, 50100, Finland
| | - Kuo-Lun Tung
- Department of Chemical Engineering, National Taiwan University, Taipei, 106, Taiwan
| | - Yi-Li Lin
- Department of Safety Health and Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 824, Taiwan.
| | - Cheng-Di Dong
- Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 81157, Taiwan
| | - Chiu-Wen Chen
- Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 81157, Taiwan
| | - Chung-Hsin Wu
- Department of Chemical and Materials Engineering, National Kaohsiung University of Science and Technology, Kaohsiung, 80,778, Taiwan
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Zhang J, Song J, Mou F, Guan J, Sen A. Titania-Based Micro/Nanomotors: Design Principles, Biomimetic Collective Behavior, and Applications. TRENDS IN CHEMISTRY 2021. [DOI: 10.1016/j.trechm.2021.02.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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10
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Madhavan N, Mukherjee M, Basavaraj MG. Porous Ceramics via Processable Pickering Emulsion Stabilized by Oppositely Charged Colloids. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:11645-11654. [PMID: 32894827 DOI: 10.1021/acs.langmuir.0c02339] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We report a method to produce processable Pickering emulsions in which electrostatic heteroaggregation of oppositely charged fumed silica and alumina particles is exploited. The ability of weakly charged heteroaggregates to adsorb to the oil-water interface favors the formation of highly stable emulsions. A control over the microstructure and rheology of the Pickering emulsion is demonstrated by tuning parameters such as composition, pH, and total concentration of particles. The Pickering emulsions formed under optimal conditions are found to be gel-like and are excellent templates for the fabrication of porous ceramics. Furthermore, the porous mullite ceramic structure which has exceptional thermal and chemical resistance under harsh environments is obtained by drying and sintering of the emulsion template. The phase evolution, microstructure, and porosity of the resulting ceramic are characterized.
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Affiliation(s)
- Nithin Madhavan
- Metal Foams and Porous Materials Lab, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - Manas Mukherjee
- Metal Foams and Porous Materials Lab, Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai 600036, India
| | - Madivala G Basavaraj
- Polymer Engineering and Colloid Science Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai 600036, India
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Mou F, Li X, Xie Q, Zhang J, Xiong K, Xu L, Guan J. Active Micromotor Systems Built from Passive Particles with Biomimetic Predator-Prey Interactions. ACS NANO 2020; 14:406-414. [PMID: 31860277 DOI: 10.1021/acsnano.9b05996] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Inspired by chasing-escaping behaviors of predator and swarming prey in nature, here we demonstrate a concept to create active micromotor systems from two species of passive microparticles with biomimetic predator-prey interactions. In this concept, the biomimetic predator-prey interactions are established in a binary particle system comprising the diffusiophoretic attractive microparticles (prey particles) and the diffusiophoretic repulsive ones (predator particles). In the absence of additional chemical fuels and external fields, the predator particles are attracted by and constantly chase the swarming prey particles, which, in response, escape from the former and show dynamic group reconfigurations because of the local repulsion. Based on this concept, various synthetic active micromotor systems have been demonstrated, including active ZnO-TiO2, Ag3PO4-TiO2, and ZnO-AgBr micromotor systems. As the predator and prey particles are powered by each other through the biomimetic predator-prey interactions, the concept proposed here provides an advanced method to develop not only a class of single micromotors powered by passive particles or "solid fuels" but also micromotor swarms capable of manipulating "moving cargo". In addition, it also illustrates a proof-of-concept implementation of intelligent micro/nanomotor systems composed of heterogeneous individuals with complementary or cooperative functions.
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Affiliation(s)
- Fangzhi Mou
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , People's Republic of China
| | - Xiaofeng Li
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , People's Republic of China
| | - Qi Xie
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , People's Republic of China
| | - Jianhua Zhang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , People's Republic of China
| | - Kang Xiong
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , People's Republic of China
| | - Leilei Xu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , People's Republic of China
| | - Jianguo Guan
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering , Wuhan University of Technology , 122 Luoshi Road , Wuhan 430070 , People's Republic of China
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12
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Mou F, Zhang J, Wu Z, Du S, Zhang Z, Xu L, Guan J. Phototactic Flocking of Photochemical Micromotors. iScience 2019; 19:415-424. [PMID: 31421596 PMCID: PMC6704395 DOI: 10.1016/j.isci.2019.07.050] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Revised: 07/24/2019] [Accepted: 07/30/2019] [Indexed: 01/26/2023] Open
Abstract
Inspired by astonishing collective motions and tactic behaviors in nature, here we show phototactic flocking of synthetic photochemical micromotors. When enriched with hydroxyl groups, TiO2 micromotors can spontaneously gather into flocks in aqueous media through electrolyte diffusiophoresis. Under light irradiation, due to the dominant nonelectrolyte diffusiophoretic interaction resulting from the overlap of asymmetric nonelectrolyte clouds around adjacent individuals, these flocks exhibit intriguing collective behaviors, such as dilatational negative phototaxis, high collective velocity, and adaptive group reconfiguration. Consequently, the micromotor flocks can migrate along pre-designed paths and actively bypass obstacles with reversible dilatation (expansion/contraction) under pulsed light navigation. Furthermore, owing to the enhanced driving force and rapid dilatational area covering, they are able to execute cooperative tasks that single micromotors cannot achieve, such as cooperative large-cargo transport and collective microenvironment mapping. Our discovery would promote the creation of reconfigurable microrobots, active materials, and intelligent synthetic systems.
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Affiliation(s)
- Fangzhi Mou
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
| | - Jianhua Zhang
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
| | - Zhen Wu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
| | - Sinan Du
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China
| | - Zexin Zhang
- State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
| | - Leilei Xu
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
| | - Jianguo Guan
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, International School of Materials Science and Engineering, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
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Goncharuk O, Shipul O, Dyachenko A, Ischenko O, Andriyko L, Marynin A, Pakhlov E, Oranska O, Borysenko M. Silica-supported Ni and Co nanooxides: Colloidal properties and interactions with polar and nonpolar liquids. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2019.04.127] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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14
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Corredor LM, Husein MM, Maini BB. Effect of Hydrophobic and Hydrophilic Metal Oxide Nanoparticles on the Performance of Xanthan Gum Solutions for Heavy Oil Recovery. NANOMATERIALS 2019; 9:nano9010094. [PMID: 30642044 PMCID: PMC6358868 DOI: 10.3390/nano9010094] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 01/02/2019] [Accepted: 01/07/2019] [Indexed: 11/24/2022]
Abstract
Recent studies revealed higher polymer flooding performance upon adding metal oxide nanoparticles (NPs) to acrylamide-based polymers during heavy oil recovery. The current study considers the effect of TiO2, Al2O3, in-situ prepared Fe(OH)3 and surface-modified SiO2 NPs on the performance of xanthan gum (XG) solutions to enhance heavy oil recovery. Surface modification of the SiO2 NPs was achieved by chemical grafting with 3-(methacryloyloxy)propyl]trimethoxysilane (MPS) and octyltriethoxysilane (OTES). The nanopolymer sols were characterized by their rheological properties and ζ-potential measurements. The efficiency of the nanopolymer sols in displacing oil was assessed using a linear sand-pack at 25 °C and two salinities (0.3 wt % and 1.0 wt % NaCl). The ζ-potential measurements showed that the NP dispersions in deionized (DI) water are unstable, but their colloidal stability improved in presence of XG. The addition of unmodified and modified SiO2 NPs increased the viscosity of the XG solution at all salinities. However, the high XG adsorption onto the surface of Fe(OH)3, Al2O3, and TiO2 NPs reduced the viscosity of the XG solution. Also, the NPs increased the cumulative oil recovery between 3% and 9%, and between 1% and 5% at 0 wt % and 0.3 wt % NaCl, respectively. At 1.0 wt % NaCl, the NPs reduced oil recovery by XG solution between 5% and 12%, except for Fe(OH)3 and TiO2 NPs. These NPs increased the oil recovery between 2% and 3% by virtue of reduced polymer adsorption caused by the alkalinity of the Fe(OH)3 and TiO2 nanopolymer sols.
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Affiliation(s)
- Laura M Corredor
- Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada.
| | - Maen M Husein
- Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada.
| | - Brij B Maini
- Department of Chemical and Petroleum Engineering, University of Calgary, Calgary, AB T2N 1N4, Canada.
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15
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Analysis on the Influence of Component Ratio on Properties of Silica/Montmorillonite Nanocomposites. MATERIALS 2018; 11:ma11112074. [PMID: 30352956 PMCID: PMC6266273 DOI: 10.3390/ma11112074] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2018] [Revised: 10/14/2018] [Accepted: 10/18/2018] [Indexed: 11/25/2022]
Abstract
Silica/montmorillonite (MMT) nanocomposites (SMCs) were prepared by generating SiO2 nanoparticles on an MMT surface using an organic/inorganic hybrid technique with different ratios of tetraethylorthosilicate (TEOS) to MMT (10:1, 20:1 and 40:1). The hydrolysis and polycondensation reactions were controlled by TEOS when it was incorporated into the internal space of the MMT. The delamination and intercalation of the MMT layers were closely related to the TEOS/MMT ratio. The surface chemistry and particulate morphology, thermal properties, pore structure and hygroscopicity of nanocomposites were investigated. The results showed that silica nanoparticles could be intercalated into a layered MMT and induced a high specific surface area (~474 m2·g−1). At a lower ratio (10:1 and 20:1), the dispersed layers could be created from the stack MMT layers and incorporated into a silica matrix, resulting in an increased thermal stability and a decreased pore size. A higher ratio (40:1) caused the intensive self-condensation of the silanol groups, leading to a negative effect on the sol penetration to the MMT. The hydrophilicity of the SMCs increased significantly due to the synergistic effect of the hydroxyl groups and pore structure caused by silica incorporation. A mechanism concerning the effect of component ratio was also proposed for synthesizing this nanocomposite based on the research results. The potential applications of this heterostructured nanocomposites could be summarized as a desiccant, functional fillers, and pollutant disposal.
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16
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Facile recycling of Escherichia coli and Saccharomyces cerevisiae cells from suspensions using magnetic modification method and mechanism analysis. Colloids Surf B Biointerfaces 2018; 169:1-9. [DOI: 10.1016/j.colsurfb.2018.05.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2017] [Revised: 04/04/2018] [Accepted: 05/02/2018] [Indexed: 01/31/2023]
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17
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Chen M, Alim N, Zhang Y, Xu N, Cao X. Contrasting effects of biochar nanoparticles on the retention and transport of phosphorus in acidic and alkaline soils. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 239:562-570. [PMID: 29698906 DOI: 10.1016/j.envpol.2018.04.050] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 04/09/2018] [Accepted: 04/09/2018] [Indexed: 05/24/2023]
Abstract
Land application of biomass-derived biochar has been increasingly recommended as a beneficial soil amendment for nutrients (such as N, P) retention. However, the small-scale biochar particles, especially those in the nano-scale range, may carry nutrients downward the soil profile, reducing nutrition retention and posing a potential risk to the groundwater. In this study, column experiments were conducted to investigate the retention and transport of phosphorus (P) in two acidic and two alkaline soils as affected by wood chip-derived biochar nanoparticles (NPs). In acidic paddy and red soils, biochar NPs facilitated the retention of P, increasing by about 24% and 16%, respectively, compared to the biochar absence. It is because biochar NPs stabilize soil Fe/Al oxides and dissolved organic carbon (DOC), thereby reducing the release of Fe/Al oxides- and DOC-associated P. In contrast, in alkaline huangmian and chao soils, retention of P was reduced in the presence of biochar NPs, decreasing by about 23% and 18%, respectively. It was mainly due to the increased transport of Fe/Al oxides-associated P in effluents. Moreover, biochar NPs could also act as a P carrier, mediating the retention of P. The diffusive gradients in thin films provided in-suit measurement of labile P in soil profiles, showing much lower labile P from retained P in acidic soils than that from alkaline soils though the labile P with biochar NPs presence was increased in all soils. Our findings indicate that biochar NPs have contrasting effects on the retention of P in acidic and alkaline soils, implying the cautious land applications of biochar for nutrients retention in soils with different acidities.
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Affiliation(s)
- Ming Chen
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Nurguzal Alim
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Yitao Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Nan Xu
- Jiangsu Key Laboratory of Environmental Functional Materials, School of Chemistry Biology and Material Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Xinde Cao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
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18
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Gun'ko VM, Pakhlov EM, Goncharuk OV, Andriyko LS, Nychiporuk YM, Balakin DY, Sternik D, Derylo-Marczewska A. Nanosilica modified by polydimethylsiloxane depolymerized and chemically bound to nanoparticles or physically bound to unmodified or modified surfaces: Structure and interfacial phenomena. J Colloid Interface Sci 2018; 529:273-282. [PMID: 29908403 DOI: 10.1016/j.jcis.2018.06.019] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Revised: 06/06/2018] [Accepted: 06/07/2018] [Indexed: 11/16/2022]
Abstract
Three polydimethylsiloxanes (PDMS200, PDMS1000, and PDMS12500 with numbers showing the viscosity values dependent on the molecular weight) were used for adsorption (14-95 wt% PDMS) onto unmodified and PDMS-modified (16.7 wt% PDMS using dimethyl carbonate (DMC) as a siloxane bond breaking reagent) nanosilica A-300. The materials were studied using microscopy, infrared spectroscopy, thermodesorption, calorimetry, ethanol and water/ethanol evaporation, nitrogen adsorption-desorption, and quantum chemical methods. The interfacial and temperature behaviors of a PDMS layer at a silica surface depend strongly on the type of bonding to silica particles, molecular weight and content of PDMS. Upon chemical bonding, shorter PDMS200 forms a denser coverage of the silica surface since SBET diminution is larger and residual free silanols are practically absent (the degree of free silanol substitution Θ > 0.95) in contrast to the reactions with PDMS1000/DMC or PDMS12500/DMC providing Θ = 0.60-0.63 at larger SBET values. Upon thermal decomposition of the PDMS layer, oxidation/depolymerization desorption gives a greater contribution than pure depolymerization destruction. An increase in the PDMS adsorption layer thickness leads to enhancement of the depolymerization contribution because the oxidation mainly occurs at the top of the layer, but the depolymerization can occur in the total PDMS layer. The adsorption, desorption, and evaporation processes of low-molecular weight probes at a surface of PDMS-modified nanosilica depend strongly on the type of bonding and content of PDMS. Thus, the most effective hydrophobization of nanosilica by PDMS/DMC could be carried out using the shortest polymer giving the shortest PDMS fragments upon the interaction with DMC that is of interest from a practical point of view.
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Affiliation(s)
- V M Gun'ko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine.
| | - E M Pakhlov
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - O V Goncharuk
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - L S Andriyko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - Yu M Nychiporuk
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - D Yu Balakin
- Institute of Physics, 46 Prospect Nauki, 03028 Kyiv, Ukraine
| | - D Sternik
- Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland
| | - A Derylo-Marczewska
- Maria Curie-Sklodowska University, M. Curie-Sklodowska Sq. 3, 20-031 Lublin, Poland
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19
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Liu X, Mäki-Arvela P, Aho A, Vajglova Z, Gun'ko VM, Heinmaa I, Kumar N, Eränen K, Salmi T, Murzin DY. Zeta Potential of Beta Zeolites: Influence of Structure, Acidity, pH, Temperature and Concentration. Molecules 2018; 23:molecules23040946. [PMID: 29670070 PMCID: PMC6017097 DOI: 10.3390/molecules23040946] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2018] [Revised: 04/11/2018] [Accepted: 04/13/2018] [Indexed: 12/02/2022] Open
Abstract
Measurements of the zeta potential of solid heterogeneous supports are important for preparation of metal supported catalysts and for shaping zeolites into extrudates. In the current work, different types of heterogeneous support materials such as SiO2, Al2O3, and a range of beta zeolites of different silica- to-alumina ratio were analysed. It was observed that parameters such as temperature, pH and acidity significantly affect the zeta potential. In several instances, depending on the materials’ acidity and microstructure, maxima in zeta potential were observed. The solid materials were thoroughly characterized using XRD, SEM, EDX, TEM, nitrogen physisorption, Al-NMR and FTIR with pyridine before zeta potential measurements.
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Affiliation(s)
- Xuan Liu
- Laboratory of Industrial Chemistry and Reaction Engineering, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, FI-20500 Turku/Åbo, Finland.
| | - Päivi Mäki-Arvela
- Laboratory of Industrial Chemistry and Reaction Engineering, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, FI-20500 Turku/Åbo, Finland.
| | - Atte Aho
- Laboratory of Industrial Chemistry and Reaction Engineering, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, FI-20500 Turku/Åbo, Finland.
| | - Zuzana Vajglova
- Laboratory of Industrial Chemistry and Reaction Engineering, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, FI-20500 Turku/Åbo, Finland.
| | - Vladimir M Gun'ko
- Chuiko Institute of Surface Chemistry, National Academy of Sciences of Ukraine, 03164 Kiev, Ukraine.
| | - Ivo Heinmaa
- National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia.
| | - Narendra Kumar
- Laboratory of Industrial Chemistry and Reaction Engineering, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, FI-20500 Turku/Åbo, Finland.
| | - Kari Eränen
- Laboratory of Industrial Chemistry and Reaction Engineering, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, FI-20500 Turku/Åbo, Finland.
| | - Tapio Salmi
- Laboratory of Industrial Chemistry and Reaction Engineering, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, FI-20500 Turku/Åbo, Finland.
| | - Dmitry Yu Murzin
- Laboratory of Industrial Chemistry and Reaction Engineering, Faculty of Science and Engineering, Johan Gadolin Process Chemistry Centre, Åbo Akademi University, FI-20500 Turku/Åbo, Finland.
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20
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Gun'ko V, Krupska T, Andriyko L, Klymenko N, Siora I, Novikova O, Marynin A, Ukrainets A, Charmas B, Shekhunova S, Turov V. Bonding of doxorubicin to nanosilica and human serum albumin in various media. J Colloid Interface Sci 2018; 513:809-819. [DOI: 10.1016/j.jcis.2017.12.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 11/30/2017] [Accepted: 12/02/2017] [Indexed: 01/16/2023]
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21
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Weston JS, Harwell JH, Grady BP. Rheological characterization of yield stress gels formed via electrostatic heteroaggregation of metal oxide nanoparticles. SOFT MATTER 2017; 13:6743-6755. [PMID: 28819663 DOI: 10.1039/c7sm01035d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Mixtures of fumed fractal metal oxide nanoparticles (np's) dispersed in water, at a solution pH where one species is positively charged and the other is negatively charged, form yield stress gels at volume fractions as low as 1.5%, due to electrostatic heteroaggregation into networks as confirmed by small-angle neutron scattering. These gels exhibit a measurable yield stress and an apparent viscosity that follows a power law relationship with shear rate. Rotational and oscillatory shear rheology is presented for binary mixtures of fumed silica, fumed alumina, and fumed titania in aqueous dispersions. Gels were characterized at various particle concentrations, solution pHs, mixture ratios, and salt concentrations. The strength of the gel network, as evaluated by the storage modulus and yield stress, is maximized when the mixture contains a mixture of particles with an approximately equal, but opposite, number of charged groups.
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Affiliation(s)
- Javen S Weston
- National Institute of Standards and Technology, Materials Science and Engineering Division, Gaithersburg, MD 20899, USA
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22
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Lai JCH, Rahman MR, Hamdan S. Comparative studies of thermo-mechanical and morphological properties of polylactic acid/fumed silica/clay (1.28E) and polylactic acid/fumed silica/clay (1.34TCN) nanocomposites. Polym Bull (Berl) 2017. [DOI: 10.1007/s00289-017-2025-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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23
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Goncharuk O, Andriyko L, Marynin A, Korotych O, Zarko V, Ukrainets A, Gun’ko V, Malysheva M. Influence of Indifferent Electrolytes on Formation of Coagulative Structures in Aqueous Silica Dispersions. FRENCH-UKRAINIAN JOURNAL OF CHEMISTRY 2017. [DOI: 10.17721/fujcv5i2p40-48] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Effects of indifferent electrolytes (NaCl, KCl, LiCl, NaI, NaNO3, CaCl2, and MgCl2) on the electrical double layer (EDL), aggregation, gelling, and rheological properties of aqueous dispersions of nanosilica were investigated. All examined indifferent electrolytes enhance interactions between nanoparticles of fumed silica through the coagulation mechanism. The critical concentration of gelation and gelling time decrease in the presence of the electrolytes, while the effective viscosity of the dispersions and average size of aggregates (Def) increase in series of chlorides: Li+ < Na+ < K+ < Ca2+ < Mg2+. That corresponds to an increase in the cation radius and reduction of the hydration shell. The nature of anions and cations significantly affects the values of Def and viscosity. For sodium salts, the viscosity increases in series I- < NO3- < Cl- corresponding to an increase in the hydration shell.
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24
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Kumar S, Thareja P. Influence of electric field and shear on the rheology of fumed alumina in silicone oil suspensions. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.10.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Silica subnanometer-sized nodes, nanoclusters and aggregates in Cyanate Ester Resin-based networks: Structure and properties of hybrid subnano- and nanocomposites. Eur Polym J 2016. [DOI: 10.1016/j.eurpolymj.2016.10.047] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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Gun'ko V, Voronin E, Nosach L, Pakhlov E, Guzenko N, Leboda R, Skubiszewska-Zięba J. Adsorption and Migration of Poly(Vinyl Pyrrolidone) at a Fumed Silica Surface. ADSORPT SCI TECHNOL 2016. [DOI: 10.1260/026361706778529173] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Affiliation(s)
- V.M. Gun'ko
- Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - E.F. Voronin
- Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - L.V. Nosach
- Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - E.M. Pakhlov
- Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - N.V. Guzenko
- Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - R. Leboda
- Maria Curie-Sklodowska University, 20-031 Lublin, Poland
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27
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Fang J, Zhang K, Sun P, Lin D, Shen B, Luo Y. Co-transport of Pb(2+) and TiO2 nanoparticles in repacked homogeneous soil columns under saturation condition: Effect of ionic strength and fulvic acid. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 571:471-478. [PMID: 27405518 DOI: 10.1016/j.scitotenv.2016.07.013] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2016] [Revised: 07/02/2016] [Accepted: 07/03/2016] [Indexed: 06/06/2023]
Abstract
This study investigated the effects of suspended TiO2 nanoparticles (nTiO2) on the transport of Pb(2+) in saturated repacked soil columns under different ionic strengths (IS) and in the presence of fulvic acid (FA). Also, the contribution of soil colloids to the mobility of Pb(2+) was discussed. In the absence of nTiO2, little amount of Pb(2+) was detected in the effluent even in the presence of FA. However, the presence of nTiO2 significantly enhanced the mobility of Pb(2+) in soil columns under all tested conditions and nTiO2-associated Pb(2+) was the major migration species of Pb(2+). Increasing the solution IS decreased the nTiO2-associated Pb(2+) migration due to the significant decrease in the mobility of nTiO2 in soil. FA remarkably increased the nTiO2-associated Pb(2+) mobility in soil column, which was mainly to increase the mobility of nTiO2 in soil and decrease desorption rate of Pb(2+) from nTiO2 during transport. Moreover, nTiO2 significantly enhanced the release of Fe-Al soil colloids, which in turn was also responsible for the enhancement of Pb(2+) mobility in soil.
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Affiliation(s)
- Jing Fang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China.
| | - Keke Zhang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China
| | - Peide Sun
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China
| | - Daohui Lin
- Department of Environmental Science, Zhejiang University, Hangzhou 310058, PR China; Zhejiang Provincial Key Laboratory of Organic Pollution Process and Control, Zhejiang University, Hangzhou 310058, PR China
| | - Bing Shen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, PR China; Department of Environmental Science, Zhejiang University, Hangzhou 310058, PR China
| | - Yan Luo
- Environment Protection Research and Design Institute of Ningbo, 315012, PR China
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28
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Mattos BD, Rojas OJ, Magalhães WL. Biogenic SiO2 in colloidal dispersions via ball milling and ultrasonication. POWDER TECHNOL 2016. [DOI: 10.1016/j.powtec.2016.05.052] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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29
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Gun’ko V, Turov V, Zarko V, Goncharuk O, Pakhlov E, Skubiszewska-Zięba J, Blitz J. Interfacial phenomena at a surface of individual and complex fumed nanooxides. Adv Colloid Interface Sci 2016; 235:108-189. [PMID: 27344189 DOI: 10.1016/j.cis.2016.06.003] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2016] [Revised: 06/01/2016] [Accepted: 06/01/2016] [Indexed: 10/21/2022]
Abstract
Investigations of interfacial and temperature behaviors of nonpolar and polar adsorbates interacting with individual and complex fumed metal or metalloid oxides (FMO), initial and subjected to various treatments or chemical functionalization and compared to such porous adsorbents as silica gels, precipitated silica, mesoporous ordered silicas, filled polymeric composites, were analyzed. Complex nanooxides include core-shell nanoparticles, CSNP (50-200nm in size) with titania or alumina cores and silica or alumina shells in contrast to simple and smaller nanoparticles of individual FMO. CSNP could be destroyed under high-pressure cryogelation (HPCG) or mechanochemical activation (MCA). These treatments affect the structure of aggregates of nanoparticles and agglomerates of aggregates, resulting in their becoming more compacted. The analysis shows that complex FMO could be more sensitive to external actions than simple nanooxides such as fumed silica. Any treatment of 'soft' FMO affects the interfacial and temperature behaviors of polar and nonpolar adsorbates. Rearrangement of secondary particles and surface functionalization affects the freezing-melting point depression of adsorbates. For some adsorbates, open hysteresis loops became readily apparent in adsorption-desorption isotherms. Clustering of adsorbates bound in textural pores in aggregates of nanoparticles (i.e., voids between nanoparticles in secondary structures) causes reduced changes in enthalpy during phase transitions (freezing, fusion, evaporation). Freezing point depression and melting point elevation cause significant hysteresis freezing-melting effects for adsorbates bound to FMO in the textural pores. Relaxation phenomena for both low- and high-molecular weight adsorbates or filled polymeric composites are affected by the morphology of primary particles, structural organization of secondary particles of differently treated or functionalized FMO, content of adsorbates, co-adsorption order, and temperature.
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30
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Gun’ko V, Turov V, Zarko V, Pakhlov E, Charmas B, Skubiszewska-Zięba J. Influence of structural organization of silicas on interfacial phenomena. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2015.12.030] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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31
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Sun X, Zhao J, Chen T, Liu X. Colloidal particle size of fumed silica dispersed in solution and the particle size effect on silica gelation and some electrochemical behaviour in gelled electrolyte. J Solid State Electrochem 2015. [DOI: 10.1007/s10008-015-3090-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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32
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Silica-supported ceria–zirconia and titania–zirconia nanocomposites: Structural characteristics and electrosurface properties. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.07.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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33
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Andriyko L, Zarko V, Gun'ko V, Marynin A, Olishevskiy V, Skwarek E, Janusz W. Electrical and Physical Characteristics of Silica Nanoparticles in Aqueous Media Affected by Cations Na +, Ba 2+and Al 3+. ADSORPT SCI TECHNOL 2015. [DOI: 10.1260/0263-6174.33.6-8.601] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Affiliation(s)
- L.S. Andriyko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kyiv, Ukraine
| | - V.I. Zarko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kyiv, Ukraine
| | - V.M. Gun'ko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kyiv, Ukraine
| | - A.I. Marynin
- National University of Food Technology, 68 Volodymyrska Street, 01033 Kyiv, Ukraine
| | - V.V. Olishevskiy
- National University of Food Technology, 68 Volodymyrska Street, 01033 Kyiv, Ukraine
| | - E. Skwarek
- Faculty of Chemistry, Maria Curie-Sklodowska University, 20031 Lublin, Poland
| | - W. Janusz
- Faculty of Chemistry, Maria Curie-Sklodowska University, 20031 Lublin, Poland
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34
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Wawrzkiewicz M, Wiśniewska M, Gun'ko VM, Zarko VI. Adsorptive removal of acid, reactive and direct dyes from aqueous solutions and wastewater using mixed silica–alumina oxide. POWDER TECHNOL 2015. [DOI: 10.1016/j.powtec.2015.03.035] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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Honetschlägerová L, Janouškovcová P, Kubal M, Sofer Z. Enhanced colloidal stability of nanoscale zero valent iron particles in the presence of sodium silicate water glass. ENVIRONMENTAL TECHNOLOGY 2015; 36:358-365. [PMID: 25323113 DOI: 10.1080/09593330.2014.977825] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A method for the stabilization of nanoscale zero valent iron (nZVI) particles using silica was developed. Stabilization can significantly improve the performance characteristics of currently available nZVI products containing agglomerated particles. In the first step of the method, the agglomerates were broken using a sonication. A subsequent stabilizing effect was brought about by the deposition of silica onto the surface of the nZVI particles. The method was tested on three commercially available nZVI suspensions which formed agglomerates with mean sizes ranging from 1000 to 5000 nm. The application of the method resulted in a significant reduction of the mean size of the agglomerates to the values from 100 to 200 nm. The stabilizing effect of silica was also evidenced using scanning electron microscopy, zeta potential measurements and sedimentation analysis. The introduction of typical groundwater ions did not significantly affect the colloidal stability of the treated nZVI suspensions. The results of this study indicate that the silica coating have the potential to protect nZVI against agglomeration.
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Affiliation(s)
- Lenka Honetschlägerová
- a Department of Environmental Chemistry , Institute of Chemical Technology Prague , Prague , Czech Republic
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36
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Sugiyama Y, Ikarugi S, Oura K, Ikeda A, Matsuyama E, Ono R, Nomura M, Tawarayama H, Saito T, Kuwahara K. MFI Zeolite Membranes Prepared on Novel Silica Substrates. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 2015. [DOI: 10.1252/jcej.15we014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yuto Sugiyama
- Department of Applied Chemistry, Shibaura Institute of Technology
| | - Syusuke Ikarugi
- Department of Applied Chemistry, Shibaura Institute of Technology
| | - Kotone Oura
- Department of Applied Chemistry, Shibaura Institute of Technology
| | - Ayumi Ikeda
- Department of Applied Chemistry, Shibaura Institute of Technology
| | - Emi Matsuyama
- Department of Applied Chemistry, Shibaura Institute of Technology
| | - Ryuhei Ono
- Department of Applied Chemistry, Shibaura Institute of Technology
| | - Mikihiro Nomura
- Department of Applied Chemistry, Shibaura Institute of Technology
| | | | - Takahiro Saito
- Optical Communications R&D Labs, Sumitomo Electric Industries, Ltd
| | - Kazuya Kuwahara
- Optical Communications R&D Labs, Sumitomo Electric Industries, Ltd
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Lai JCH, Rahman MR, Hamdan S, Liew FK, Rahman MM, Hossen MF. Impact of nanoclay on physicomechanical and thermal analysis of polyvinyl alcohol/fumed silica/clay nanocomposites. J Appl Polym Sci 2014. [DOI: 10.1002/app.41843] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Josephine Chang-Hui Lai
- Department of Chemical Engineering and Energy Sustainability, Faculty of Engineering; Universiti Malaysia Sarawak; Kota Samarahan Sarawak 94300 Malaysia
| | - Md. Rezaur Rahman
- Department of Chemical Engineering and Energy Sustainability, Faculty of Engineering; Universiti Malaysia Sarawak; Kota Samarahan Sarawak 94300 Malaysia
| | - Sinin Hamdan
- Department of Mechanical Engineering, Faculty of Engineering; Universiti Malaysia Sarawak; Kota Samarahan Sarawak 94300 Malaysia
| | - Fui Kiew Liew
- Department of Mechanical Engineering, Faculty of Engineering; Universiti Malaysia Sarawak; Kota Samarahan Sarawak 94300 Malaysia
| | - Md. Mizanur Rahman
- Department of Chemical Engineering and Energy Sustainability, Faculty of Engineering; Universiti Malaysia Sarawak; Kota Samarahan Sarawak 94300 Malaysia
| | - Md. Faruk Hossen
- Department of Chemical Engineering and Energy Sustainability, Faculty of Engineering; Universiti Malaysia Sarawak; Kota Samarahan Sarawak 94300 Malaysia
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38
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Weston JS, Venkataramani D, Aichele CP, Grady BP, Harwell J, Resasco D. Pseudosolid, shear-thinning gel formation in binary dispersions of metal oxide nanoparticles at low volume fractions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:14982-14990. [PMID: 25438086 DOI: 10.1021/la503442a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Hydroxyl groups on the surface of metal oxide nanoparticles (nps) can be protonated or deprotonated depending on solution pH, changing both the magnitude and sign of the nps' surface charge. Binary mixtures of fumed metal oxide nps, dispersed in water at a solution pH where one species is positively charged and the other is negatively charged, form pseudosolid gels at volume fractions as low as 1.5 vol %. This work maps out regions of gel formation for binary mixtures of silica and alumina nps, silica and titania nps, and alumina and titania nps. The microscopic structure of these gels is investigated using transmission electron microscopy (TEM), small-angle x-ray scattering (SAXS), acoustic spectroscopy, and light microscopy.
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Affiliation(s)
- J S Weston
- School of Chemical, Biological and Materials Engineering, University of Oklahoma , Norman, Oklahoma 73019, United States
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39
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Gun’ko V, Turov V, Myronyuk I, Goncharuk O, Pakhlov E, Bezruka N, Skwarek E, Janusz W, Blitz J. Interfacial phenomena at a surface of partially silylated nanosilica. J Colloid Interface Sci 2014; 434:28-39. [DOI: 10.1016/j.jcis.2014.08.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2014] [Revised: 08/02/2014] [Accepted: 08/04/2014] [Indexed: 10/24/2022]
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40
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Gun’ko V, Turov V, Zarko V, Pakhlov E, Matkovsky A, Oranska O, Palyanytsya B, Remez O, Nychiporuk Y, Ptushinskii Y, Leboda R, Skubiszewska-Zięba J. Cryogelation of individual and complex nanooxides under different conditions. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2014.05.045] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Abstract
AbstractEffects of chlorides of univalent (LiCl, NaCl, KCl), bivalent (MgCl2, BaCl2) and trivalent (AlCl3) metals at different concentration (0.001–0.1 M) on the behavior of nanosilica A-200 (0.5–5 wt.%) in aqueous media are analyzed using photon correlation spectroscopy (particle size distribution, PSD), electrophoresis (zeta potential ζ), potentiometric titration (surface charge density), and estimation of screening length of primary particles and their aggregates. The zeta potential and the PSD are affected by silica content, pH, and concentration and type of dissolved salts. Smaller but more strongly hydrated Li+ cations caused stronger nonlinear dependences of the zeta potential on pH and salt content than Na+ or K+. This nonlinearity is much stronger at a lower content of silica (0.5–1 wt.%) than at C
A-200 = 2.5 or 5 wt.%. At a high concentration of nanosilica (5 wt.%) the effect of K+ ions causes stronger diminution of the negative value of the zeta potential due to better adsorption of larger cations. Therefore, the influence of K+ on increasing screening length is stronger than that of Na+ for both primary nanoparticles and their aggregates. A similar difference in the ζ values is observed for different in size cations Ba2+ and Mg2+.
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42
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Stamatopoulou C, Klonos P, Koutsoumpis S, Gun'ko V, Pissis P, Karabanova L. Hydrophilic nanocomposites based on polyurethane/poly(2-hydroxyethyl methacrylate) semi-IPNs and modified/unmodified nanosilica for biomedical applications. ACTA ACUST UNITED AC 2013. [DOI: 10.1002/polb.23427] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
| | - Panagiotis Klonos
- National Technical University of Athens; Zografou Campus 15780 Athens Greece
| | | | - Vladimir Gun'ko
- Institute of Surface Chemistry of National Academy of Sciences of Ukraine; 03164 Kiev Ukraine
| | - Polycarpos Pissis
- National Technical University of Athens; Zografou Campus 15780 Athens Greece
| | - Lyudmyla Karabanova
- Institute of Macromolecular Chemistry of National Academy of Sciences of Ukraine; 02660 Kiev Ukraine
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Castellani R, Poulesquen A, Goettmann F, Marchal P, Choplin L. Ions effects on sol–gel transition and rheological behavior in alumina slurries. Colloids Surf A Physicochem Eng Asp 2013. [DOI: 10.1016/j.colsurfa.2013.03.056] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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44
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Bershtein VA, Gun'ko VM, Karabanova LV, Sukhanova TE, Yakushev PN, Egorova LM, Turova AA, Zarko VI, Pakhlov EM, Vylegzhanina ME, Mikhalovsky SV. Polyurethane–poly(2-hydroxyethyl methacrylate) semi-IPN–nanooxide composites. RSC Adv 2013. [DOI: 10.1039/c3ra40295a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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45
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Ma Q, Sun H, Che E, Zheng X, Jiang T, Sun C, Wang S. Uniform nano-sized valsartan for dissolution and bioavailability enhancement: influence of particle size and crystalline state. Int J Pharm 2012; 441:75-81. [PMID: 23266761 DOI: 10.1016/j.ijpharm.2012.12.025] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2012] [Revised: 11/06/2012] [Accepted: 12/15/2012] [Indexed: 12/31/2022]
Abstract
The central purpose of this study was to evaluate the impact of drug particle size and crystalline state on valsartan (VAL) formulations in order to improve its dissolution and bioavailability. VAL microsuspension (mean size 22 μm) and nanosuspension (30-80nm) were prepared by high speed dispersing and anti-solvent precipitation method and converted into powders through spray drying. Differential scanning calorimetry studies indicated amorphization of VAL in the spray-dried valsartan nanosuspension (SD-VAL-Nano) but recrystallization occurred after 6 months storage at room temperature. The spray-dried valsartan microsuspension (SD-VAL-Micro) conserved the crystalline form. The VAL dissolution rate and extent were markedly enhanced with both SD-VAL-Micro and SD-VAL-Nano as compared to crude VAL crystals over the pH range of 1.2-6.8. Pharmacokinetic studies in rats demonstrated a 2.5-fold increase in oral bioavailability in the case of SD-VAL-Nano compared with the commercial product while the SD-VAL-Micro provided a much less desirable pharmacokinetic profile. In conclusion, reducing particle size to the nano-scale appears to be a worthwhile and promising approach to obtain VAL products with optimum bioavailability. In addition, the impact of crystalline state on the bioavailability of nano-sized VAL might be not as big as that of particle size.
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Affiliation(s)
- Qiuping Ma
- Department of Pharmaceutics, School of Pharmacy, Shenyang Pharmaceutical University, Wenhua Road 103, Shenyang 110016, PR China
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46
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Jabłoński M, Gun'ko VM, Golovan AP, Leboda R, Skubiszewska-Zięba J, Pluta R, Turov VV. Textural characteristics of model and natural bone tissues and interfacial behavior of bound water. J Colloid Interface Sci 2012; 392:446-462. [PMID: 23142010 DOI: 10.1016/j.jcis.2012.08.070] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 08/23/2012] [Accepted: 08/24/2012] [Indexed: 11/29/2022]
Abstract
Water, as a probe liquid bound in model systems (highly disperse hydroxyapatite - protein composites as a model of the main components of bones) and rat bone tissues healthy and affected by osteoporosis occurred due to experimental Alzheimer's disease (EAD), has been investigated using low-temperature (1)H NMR spectroscopy, NMR cryoporometry, TG/DTG/DTA, DSC, and TG and DSC thermoporometry. The textural characteristics of these intact systems cannot be studied using the standard adsorption methods, but the cryoporometry and thermoporometry methods give these characteristics. The (1)H NMR spectra of water bound in model and natural bone tissues include signals, which can be assigned to strongly associated (typical) water (SAW, chemical shift of proton resonance δ(H)=5-6 ppm) and weakly associated (atypical) water (WAW) at δ(H)=1-2 ppm. Contributions of SAW and WAW give information on textural organization of both model and natural bones. The influence of such co-adsorbates as HCl, CDCl(3), CD(3)CN, C(6)D(6), and (CD(3))(2)SO on the interfacial behavior and clustering of bound water depends on their polarity, amounts of components, and textural and structural features of the materials analyzed with the (1)H NMR spectroscopy and cryoporometry methods. According to the NMR cryoporometry data, the EAD causes an increase in nanoporosity of the bone tissues. The total porosity and the specific surface area of biostructures (accessible for water molecules and estimated using NMR cryoporometry and TG thermoporometry methods with a model of cylindrical pores) are larger for the EAD sample. Weakly polar chloroform-d has a significant influence on the organization of water in the bone tissue, and this effect is greater for the EAD sample as more porous material.
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Affiliation(s)
- Miroslaw Jabłoński
- Department of Orthopaedics and Rehabilitation, Lublin Medical University, 20-094 Lublin, Poland
| | - Vladimir M Gun'ko
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine.
| | - Alina P Golovan
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
| | - Roman Leboda
- Faculty of Chemistry, Maria Curie-Sklodowska University, 20-031 Lublin, Poland
| | | | - Ryszard Pluta
- Laboratory of Ischemic and Neurodegenerative Brain Research, Department of Neurodegenerative Disorders, Mossakowski Medical Research Centre, Polish Academy of Sciences, 02-106 Warsaw, Poland
| | - Vladimir V Turov
- Chuiko Institute of Surface Chemistry, 17 General Naumov Street, 03164 Kiev, Ukraine
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47
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Kotsokechagia T, Zaki NM, Syres K, de Leonardis P, Thomas A, Cellesi F, Tirelli N. PEGylation of nanosubstrates (titania) with multifunctional reagents: at the crossroads between nanoparticles and nanocomposites. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:11490-11501. [PMID: 22746328 DOI: 10.1021/la3012958] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Titania (anatase) nanoparticles were successfully PEGylated through the use of catechol (dopamine)-terminated PEG derivatives. The resulting materials were characterized by excellent stability at neutral pH and extremely low toxicity (phagocytic and nonphagocytic cell lines). In particular, we focused on the comparison between mono- and bis-catechol PEGs. Due to the double terminal anchorage on the titania surface, bis-catechol ligands can produce chains differing from classical monoanchored PEG in conformation (horseshoe-shaped vs brush) and thus the possibility of interactions with biomolecules. At the same time, less than quantitative catechol binding may lead to the presence of dangling chains with unbound catechols which can polymerize and eventually produce PEG/titania nanocomposite colloids. Our results on double-functional PEG2000 show the latter to be the case. Pluronic F127 was also used as a bifunctional ligand, leading to nanocomposite aggregates with an even larger organic content.
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Affiliation(s)
- Tania Kotsokechagia
- School of Pharmacy and Pharmaceutical Sciences, University of Manchester, Manchester, United Kingdom
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48
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Zohoorian-Abootorabi T, Sanee H, Iranfar H, Saberi MR, Chamani J. Separate and simultaneous binding effects through a non-cooperative behavior between cyclophosphamide hydrochloride and fluoxymesterone upon interaction with human serum albumin: multi-spectroscopic and molecular modeling approaches. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 88:177-191. [PMID: 22217702 DOI: 10.1016/j.saa.2011.12.026] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Revised: 11/25/2011] [Accepted: 12/15/2011] [Indexed: 05/31/2023]
Abstract
This study was designed to examine the interaction of two anti-breast cancer drugs, i.e., fluoxymesterone (FLU) and cyclophosphamide (CYC), with human serum albumin (HSA) using different kinds of spectroscopic, zeta potential and molecular modeling techniques under imitated physiological conditions. The RLS technique was utilized to investigate the effect of the two anticancer drugs on changes of the protein conformation, both separately and simultaneously. Our study suggested that the enhancement in RLS intensity was attributed to the formation of a new complex between the two drugs and the protein. Both drugs demonstrated a powerful ability to quench the fluorescence of HSA, and the fluorescence quenching action was much stronger when the two drugs coexisted. The quenching mechanism was suggested to be static as confirmed by time-resolved fluorescence spectroscopy results. The effect of both drugs on the conformation of HSA was analyzed using synchronous fluorescence spectroscopy. Our results revealed that the fluorescence quenching of HSA originated from the Trp and Tyr residues, and demonstrated a conformational change of HSA with the addition of both drugs. The binding distances between HSA and the drugs were estimated by the Förster theory, and it was revealed that nonradiative energy transfer from HSA to both drugs occurred with a high probability. According to CD measurements, the influence of both drugs on the secondary structure of HSA in aqueous solutions was also investigated and illustrated that the α-helix content of HSA decreased with increasing drug concentration in both systems. Moreover, the zeta-potential experiments revealed that both drugs induced conformational changes on HSA. Docking studies were also performed and demonstrated that a reduction of the binding affinity between the drugs and HSA occurred in the presence of both drugs.
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49
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Pabisch S, Feichtenschlager B, Kickelbick G, Peterlik H. Effect of interparticle interactions on size determination of zirconia and silica
based systems – A comparison of SAXS, DLS, BET, XRD and TEM. Chem Phys Lett 2012; 521:91-97. [PMID: 22347721 PMCID: PMC3280720 DOI: 10.1016/j.cplett.2011.11.049] [Citation(s) in RCA: 89] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 11/18/2011] [Indexed: 11/28/2022]
Abstract
The aim of this work is a systematic comparison of size characterisation methods for two completely different model systems of oxide nanoparticles, i.e. amorphous spherical silica and anisotropic facet-shaped crystalline zirconia. Size and/or size distribution were determined in a wide range from 5 to 70 nm using small-angle X-ray scattering (SAXS), dynamic light scattering (DLS), nitrogen sorption (BET), X-ray diffraction (XRD) and transmission electron microscopy (TEM). A nearly perfect coincidence was observed only for SAXS and TEM for both types of particles. For zirconia nanoparticles considerable differences between different measurement methods were observed.
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Affiliation(s)
- Silvia Pabisch
- University of Vienna, Faculty of Physics, 1090 Vienna,
Austria
- Vienna University of Technology, Institute of Materials Chemistry, 1060
Vienna, Austria
| | | | - Guido Kickelbick
- Saarland University, Inorganic Solid State Chemistry, 66125
Saarbrücken, Germany
| | - Herwig Peterlik
- University of Vienna, Faculty of Physics, 1090 Vienna,
Austria
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50
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Sajjad M, Feichtenschlager B, Pabisch S, Svehla J, Koch T, Seidler S, Peterlik H, Kickelbick G. Study of the effect of the concentration, size and surface chemistry of zirconia and silica nanoparticle fillers within an epoxy resin on the bulk properties of the resulting nanocomposites. POLYM INT 2011. [DOI: 10.1002/pi.3183] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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