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Zhou J, Song D, Mergelsberg ST, Wang Y, Adhikari NM, Lahiri N, Zhao Y, Chen P, Wang Z, Zhang X, Rosso KM. Facet-dependent dispersion and aggregation of aqueous hematite nanoparticles. SCIENCE ADVANCES 2024; 10:eadi7494. [PMID: 38354235 PMCID: PMC10866548 DOI: 10.1126/sciadv.adi7494] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Accepted: 01/12/2024] [Indexed: 02/16/2024]
Abstract
Nanoparticle aggregates in solution controls surface reactivity and function. Complete dispersion often requires additive sorbents to impart a net repulsive interaction between particles. Facet engineering of nanocrystals offers an alternative approach to produce monodisperse suspensions simply based on facet-specific interaction with solvent molecules. Here, we measure the dispersion/aggregation of three morphologies of hematite (α-Fe2O3) nanoparticles in varied aqueous solutions using ex situ electron microscopy and in situ small-angle x-ray scattering. We demonstrate a unique tendency of (104) hematite nanoparticles to maintain a monodisperse state across a wide range of solution conditions not observed with (001)- and (116)-dominated particles. Density functional theory calculations reveal an inert, densely hydrogen-bonded first water layer on the (104) facet that favors interparticle dispersion. Results validate the notion that nanoparticle dispersions can be controlled through morphology for specific solvents, which may help in the development of various nanoparticle applications that rely on their interfacial area to be highly accessible in stable suspensions.
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Affiliation(s)
| | | | | | - Yining Wang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Narendra M. Adhikari
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Nabajit Lahiri
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Yatong Zhao
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Ping Chen
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Zheming Wang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Xin Zhang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Kevin M. Rosso
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA 99354, USA
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2
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Halder S, Paul M, Dyagala S, Aggrawal R, Aswal VK, Biswas S, Saha SK. Role of Gemini Surfactants with Variable Spacers and SiO 2 Nanoparticles in ct-DNA Compaction and Applications toward In Vitro/ In Vivo Gene Delivery. ACS APPLIED BIO MATERIALS 2023. [PMID: 37277159 DOI: 10.1021/acsabm.3c00256] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Compaction of calf thymus DNA (ct-DNA) by two cationic gemini surfactants, 12-4-12 and 12-8-12, in the absence and presence of negatively charged SiO2 nanoparticles (NPs) (∼100 nm) has been explored using various techniques. 12-8-12 having a longer hydrophobic spacer induces a greater extent of ct-DNA compaction than 12-4-12, which becomes more efficient with SiO2 NPs. While 50% ct-DNA compaction in the presence of SiO2 NPs occurs at ∼77 nM of 12-8-12 and ∼130 nM of 12-4-12, but a conventional counterpart surfactant, DTAB, does it at its concentration as high as ∼7 μM. Time-resolved fluorescence anisotropy measurements show changes in the rotational dynamics of a fluorescent probe, DAPI, and helix segments in the condensed DNA. Fluorescence lifetime data and ethidium bromide exclusion assays reveal the binding sites of surfactants to ct-DNA. 12-8-12 with SiO2 NPs has shown the highest cell viability (≥90%) and least cell death in the human embryonic kidney (HEK) 293 cell lines in contrast to the cell viability of ≤80% for DTAB. These results show that 12-8-12 with SiO2 NPs has the highest time and dose-dependent cytotoxicity compared to 12-8-12 and 12-4-12 in the murine breast cancer 4T1 cell line. Fluorescence microscopy and flow cytometry are performed for in vitro cellular uptake of YOYO-1-labeled ct-DNA with surfactants and SiO2 NPs using 4T1 cells after 3 and 6 h incubations. The in vivo tumor accumulation studies are carried out using a real-time in vivo imaging system after intravenous injection of the samples into 4T1 tumor-bearing mice. 12-8-12 with SiO2 has delivered the highest amount of ct-DNA in cells and tumors in a time-dependent manner. Thus, the application of a gemini surfactant with a hydrophobic spacer and SiO2 NPs in compacting and delivering ct-DNA to the tumor is proven, warranting its further exploration in nucleic acid therapy for cancer treatment.
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Affiliation(s)
- Sayantan Halder
- Department of Chemistry, Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus, Hyderabad, Telangana 500078, India
| | - Milan Paul
- Department of Pharmacy, Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus, Hyderabad, Telangana 500078, India
| | - Shalini Dyagala
- Department of Chemistry, Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus, Hyderabad, Telangana 500078, India
| | - Rishika Aggrawal
- Department of Chemistry, Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus, Hyderabad, Telangana 500078, India
| | - Vinod K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre (BARC), Trombay, Mumbai, Maharashtra 400085, India
| | - Swati Biswas
- Department of Pharmacy, Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus, Hyderabad, Telangana 500078, India
| | - Subit K Saha
- Department of Chemistry, Birla Institute of Technology & Science (BITS) Pilani, Hyderabad Campus, Hyderabad, Telangana 500078, India
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3
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Al-Maskari S, Issac A, Varanasi SR, Hildner R, Sofin RGS, Ibrahim AR, Abou-Zied OK. Dye-induced photoluminescence quenching of quantum dots: role of excited state lifetime and confinement of charge carriers. Phys Chem Chem Phys 2023; 25:14126-14137. [PMID: 37161937 DOI: 10.1039/d3cp00715d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
We investigate the role of quantum confinement and photoluminescence (PL) lifetime of photoexcited charge carriers in semiconductor core/shell quantum dots (QDs) via PL quenching due to surface modification. Surface modification is controlled by varying the number of dye molecules adsorbed onto the QD shell surface forming QD-dye nanoassemblies. We selected CuInS2/ZnS (CIS) and InP/ZnS (InP) core/shell QDs exhibiting relatively weak (664 meV) and strong (1194 meV) confinement potentials for the conduction band electron. Moreover, the difference in the emission mechanism gives rise to a long and short excited state lifetime of CIS (ca. 290 ns) and InP (ca. 37 ns) QDs. Dye molecules of different ionic characters (rhodamine 575: zwitterionic and rhodamine 560: cationic) are used as quenchers. A detailed analysis of Stern-Volmer data shows that (i) quenching is generally more pronounced in CIS-dye assemblies as compared to InP-dye assemblies, (ii) dynamic quenching is dominating in all QD-dye assemblies with only a minor contribution from static quenching and (iii) the cationic dye shows a stronger interaction with the QD shell surface than the zwitterionic dye. Observations (i) and (ii) can be explained by the differences in the amplitude of the electronic component of the exciton wavefunction near the dye binding sites in both QDs, which results in the breaking up of the electron-hole pair and favors charge trapping. Observation (iii) can be attributed to the variations in electrostatic interactions between the negatively charged QD shell surface and the cationic and zwitterionic dyes, with the former exhibiting a stronger interaction. Moreover, the long lifetime of CIS QDs facilitates us to easily probe different time scales of the trapping processes and thus differentiate the origins of static and dynamic quenching components that appear in the Stern-Volmer analysis.
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Affiliation(s)
- Saleem Al-Maskari
- Department of Physics, College of Science, Sultan Qaboos University, Muscat 123, Oman.
| | - Abey Issac
- Department of Physics, College of Science, Sultan Qaboos University, Muscat 123, Oman.
| | | | - Richard Hildner
- Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - R G Sumesh Sofin
- Department of Physics, College of Science, Sultan Qaboos University, Muscat 123, Oman.
| | - A Ramadan Ibrahim
- Department of Chemistry, College of Science, Sultan Qaboos University, Muscat 123, Oman
| | - Osama K Abou-Zied
- Department of Chemistry, College of Science, Sultan Qaboos University, Muscat 123, Oman
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4
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Ismail SM, Abd-Elaal AA, Abd El-salam FH, Taher FA, Aiad I, Shaban SM. Synthesis of silver decorated magnetic Fe3O4/alginate polymeric surfactant with controllable catalytic activity toward p-NP removal and enzymatic-mimic activity for solid-colorimetric H2O2 detection. CHEMICAL ENGINEERING JOURNAL 2023; 453:139593. [DOI: 10.1016/j.cej.2022.139593] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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5
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Shaban SM, Hamed EH, Elsharif AM, Elged AH, El Basiony N. Preparation gemini non-ionic surfactants-based polyethylene oxide with variable hydrophobic tails for controlling the catalytic and antimicrobial activity of AgNPs. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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6
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Porto Santos T, Cejas CM, Cunha RL, Tabeling P. Unraveling driving regimes for destabilizing concentrated emulsions within microchannels. SOFT MATTER 2021; 17:1821-1833. [PMID: 33399611 DOI: 10.1039/d0sm01674h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Coalescence is the most widely demonstrated mechanism for destabilizing emulsion droplets in microfluidic chambers. However, we find that depending on the channel wall surface functionalization, surface zeta potential, type of surfactant, characteristics of the oil as a dispersed phase, or even the presence of externally-induced stress, other different destabilization mechanisms can occur in subtle ways. In general, we observe four regimes leading to destabilization of concentrated emulsions: (i) coalescence, (ii) emulsion bursts, (iii) a combination of the two first mechanisms, attributed to the simultaneous occurrence of coalescence and emulsion bursts; and (iv) compaction of the droplet network that eventually destabilizes to fracture-like behavior. We correlate various physico-chemical properties (zeta potential, contact angle, interfacial tension) to understand their respective influence on the destabilization mechanisms. This work provides insights into possible ways to control or inflict emulsion droplet destabilization for different applications.
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Affiliation(s)
- Tatiana Porto Santos
- Department of Food Engineering, Faculty of Food Engineering, University of Campinas, Rua Monteiro Lobato, 80-CEP 13083-862 Campinas, Brazil. and Microfluidics, MEMS, Nanostructures Laboratory, CNRS Chimie Biologie Innovation (CBI) UMR 8231, Institut Pierre Gilles de Gennes (IPGG), ESPCI Paris, PSL Research University, 6 rue Jean Calvin 75005, Paris, France.
| | - Cesare M Cejas
- Microfluidics, MEMS, Nanostructures Laboratory, CNRS Chimie Biologie Innovation (CBI) UMR 8231, Institut Pierre Gilles de Gennes (IPGG), ESPCI Paris, PSL Research University, 6 rue Jean Calvin 75005, Paris, France.
| | - Rosiane Lopes Cunha
- Department of Food Engineering, Faculty of Food Engineering, University of Campinas, Rua Monteiro Lobato, 80-CEP 13083-862 Campinas, Brazil.
| | - Patrick Tabeling
- Microfluidics, MEMS, Nanostructures Laboratory, CNRS Chimie Biologie Innovation (CBI) UMR 8231, Institut Pierre Gilles de Gennes (IPGG), ESPCI Paris, PSL Research University, 6 rue Jean Calvin 75005, Paris, France.
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7
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Kiprotich S, Dejene FB, Onani MO. Capping Ligand Influence on the Structural, Optical and Luminescence Properties of CdTe Nanoparticles Prepared by a Simple Wet Chemical Process. ChemistrySelect 2019. [DOI: 10.1002/slct.201803974] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Sharon Kiprotich
- Department of PhysicsUniversity of the Free State (QwaQwa Campus) Private Bag X13 Phuthaditjhaba 9866 South Africa
| | - Francis B. Dejene
- Department of PhysicsUniversity of the Free State (QwaQwa Campus) Private Bag X13 Phuthaditjhaba 9866 South Africa
| | - Martin O. Onani
- Department of ChemistryUniversity of the Western Cape Private Bag X17 Bellville 7535 South Africa
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8
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Investigations on structural and optical properties of starch capped ZnS nanoparticles synthesized by microwave irradiation method. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.04.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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9
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Pejjai B, Minnam Reddy VR, Gedi S, Park C. Review on earth-abundant and environmentally benign Cu–Sn–X(X = S, Se) nanoparticles by chemical synthesis for sustainable solar energy conversion. J IND ENG CHEM 2018. [DOI: 10.1016/j.jiec.2017.09.033] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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10
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Bari SS, Mishra S. Calcium silicate nanowires – An effective alternative for improving mechanical properties of chitosan-hydroxyethyl methacrylate (HEMA) copolymer nanocomposites. Carbohydr Polym 2017; 169:426-432. [DOI: 10.1016/j.carbpol.2017.04.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2016] [Revised: 03/16/2017] [Accepted: 04/11/2017] [Indexed: 10/19/2022]
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11
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Uddandarao P, Balakrishnan RM. Thermal and optical characterization of biologically synthesized ZnS nanoparticles synthesized from an endophytic fungus Aspergillus flavus: A colorimetric probe in metal detection. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 175:200-207. [PMID: 28040569 DOI: 10.1016/j.saa.2016.12.021] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2016] [Revised: 11/25/2016] [Accepted: 12/14/2016] [Indexed: 06/06/2023]
Abstract
Nanostructured semiconductor materials are of great importance for several technological applications due to their optical and thermal properties. The design and fabrication of metal sulfide nanoparticles with tunable properties for advanced applications have drawn a great deal of attention in the field of nanotechnology. ZnS is a potential II-IV group material which is used in hetero-junction solar cells, light emitting diodes, optoelectronic devices, electro luminescent devices and photovoltaic cells. Due to their multiple applications, there is a need to elucidate their thermal and optical properties. In the present study, thermal and optical properties of biologically synthesized ZnS nanoparticles are determined in detail with Thermal Gravimetric Analysis (TGA), Derivative Thermogravimetric Analysis (DTG), Differential Scanning Calorimeter (DSC), Diffuse Reflectance Spectroscopy (DRS), Photoluminescence (PL) and Raman spectroscopy. The results reveal that ZnS NPs exhibit a very strong quantum confinement with a significant increase in their optical band gap energy. These biologically synthesized ZnS NPs contain protein residues that can selectively bind with metal ions in aqueous solutions and can exhibit an aggregation-induced color change. This phenomenon is utilized to quantitatively measure the metal concentrations of Cu2+ and Mn2+ in this study. Further the stability of nanoparticles for the metal sensing process is accessed by UV-Vis spectrometer, zeta potential and cyclic voltammeter. The selectivity and sensitivity of ZnS NPs indicate its potential use as a sensor for metal detection in the ecosystem.
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Affiliation(s)
- Priyanka Uddandarao
- Department of Chemical Engineering, National Institute of Technology Karnataka, India
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12
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Bari SS, Mishra S. Effect of calcium sulphate nanorods on mechanical properties of chitosan-hydroxyethyl methacrylate (HEMA) copolymer nanocomposites. Carbohydr Polym 2017; 157:409-418. [PMID: 27987945 DOI: 10.1016/j.carbpol.2016.09.083] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2016] [Revised: 09/19/2016] [Accepted: 09/27/2016] [Indexed: 01/21/2023]
Abstract
Copolymers of chitosan and hydroxyetheyl methacrylate (HEMA) were successfully synthesized using ceric ammonium nitrate (CAN) as an initiator, via in situ polymerization method, followed by efficacious preparation of their nanocomposites by incorporating calcium sulphate nanorods via solution blending process. Hydrophilicity studies confirmed that grafting of HEMA in the backbone of the hydrophobic chitosan chains induced the improvement in hydrophilicity of chitosan, while mechanical properties of the nanocomposites were also enhanced significantly up to 20%, due to availability of enlarged surface area and higher aspect ratio of CaSO4 nanorods. This was supported by FE-SEM and XRD analysis in terms of proper distribution of nanofiller through the copolymer matrix and corresponding rise in percentage crystallanity respectively. Results obtained from biodegradation studies proved the efficiency of CaSO4 nanofillers to improve biomechanical strength of chitosan nanocomposites, without affecting their normal degradation profile that renders the products to be applicable for biomedical applications.
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Affiliation(s)
- Sarang S Bari
- University Institute of Chemical Technology, North Maharashtra University, Jalgaon 425001 Maharashtra, India
| | - Satyendra Mishra
- University Institute of Chemical Technology, North Maharashtra University, Jalgaon 425001 Maharashtra, India.
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13
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Testa G, Fontana L, Venditti I, Fratoddi I. Functionalized platinum nanoparticles with surface charge trigged by pH: synthesis, characterization and stability studies. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:1822-1828. [PMID: 28144532 PMCID: PMC5238631 DOI: 10.3762/bjnano.7.175] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/18/2016] [Accepted: 11/10/2016] [Indexed: 06/06/2023]
Abstract
In this work, the synthesis and characterization of functionalized platinum nanoparticles (PtNPs) have been investigated. PtNPs were obtained by a wet redox procedure using 2-diethylaminoethanethiol hydrochloride (DEA) as capping agent. By varying the Pt/thiol molar ratio, monodispersed and stable particles with diameters in the range of 3-40 nm were isolated. The amino functionality allows neutral particles to be obtained in basic water solution and positive charged nanoparticles in neutral or acidic water solution (pH 7-2), as confirmed by DLS and ζ-potential measurements. FTIR spectroscopy, FE-SEM, DLS and ζ-potential measurements confirmed the size and showed long term water stability (up to three months) of the colloidal system.
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Affiliation(s)
- Giovanna Testa
- Department of Chemistry, University Sapienza of Rome, p.le Aldo Moro 5, 00185 Rome, Italy
| | - Laura Fontana
- Department of Chemistry, University Sapienza of Rome, p.le Aldo Moro 5, 00185 Rome, Italy
| | - Iole Venditti
- Department of Chemistry, University Sapienza of Rome, p.le Aldo Moro 5, 00185 Rome, Italy
| | - Ilaria Fratoddi
- Department of Chemistry, University Sapienza of Rome, p.le Aldo Moro 5, 00185 Rome, Italy
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14
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Bari S, Chatterjee A, Mishra S. Ultrasonication assisted and surfactant mediated synergistic approach for synthesis of calcium sulfate nano-dendrites. ULTRASONICS SONOCHEMISTRY 2016; 31:39-50. [PMID: 26964922 DOI: 10.1016/j.ultsonch.2015.11.024] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 11/10/2015] [Accepted: 11/24/2015] [Indexed: 05/17/2023]
Abstract
Calcium sulfate (CaSO4) nano-dendrimers were fabricated successfully via ultrasonic irradiation method using calcium chloride [CaCl2] and ammonium per sulfate [(NH4)2SO4] as precursors in aqueous solution by using cetyl trimethyl ammonium bromide (CTAB) as chemical surfactants. Diffusion-induced branching growth mechanism (DIBGM), influenced with the action of head-group and hydrocarbon chain effect of cationic surfactants, was the backbone in the formation of CaSO4 nano-dendrites. Fourier Transform Infra-red Spectroscopy (FTIR), X-Ray powder Diffraction (XRD), Atomic Emission Spectroscopy (AES), Selected Area Electron Diffraction (SAED), Field-Emission Scanning Electron Microscopy (FE-SEM), Energy-Dispersive Spectroscopy (EDS), Dynamic Light Spectroscopy (DLS) and BET surface area analyzer were used to characterize the products. Results obtained were compared with conventional stirring method that proved the superiority of sonication method to obtain well-crystalline nanostructures. Also, surfactant concentration, sonication frequency and time were noticed as the critical factors to generate such absolute morphologies at nano-crystalline size.
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Affiliation(s)
- Sarang Bari
- University Institute of Chemical Technology, North Maharashtra University, Jalgaon 425001, Maharashtra, India
| | - Aniruddha Chatterjee
- University Institute of Chemical Technology, North Maharashtra University, Jalgaon 425001, Maharashtra, India.
| | - Satyendra Mishra
- University Institute of Chemical Technology, North Maharashtra University, Jalgaon 425001, Maharashtra, India.
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15
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Mamiyev ZQ, Balayeva NO. Optical and structural studies of ZnS nanoparticles synthesized via chemical in situ technique. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.01.009] [Citation(s) in RCA: 9] [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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16
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Radtke M, Ignaszak A. Classical group theory adapted to the mechanism of Pt3Ni nanoparticle growth: the role of W(CO)6 as the "shape-controlling" agent. Phys Chem Chem Phys 2016; 18:75-8. [PMID: 26608555 DOI: 10.1039/c5cp05060j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Classical group theory was applied to prove the Pt3Ni crystallographic transformation from Platonic cubic to Archimedean cuboctahedral structures and the formation of Pt3Ni polypods. The role of W(CO)6 as a shape-controlling agent is discussed with respect to the crystallographic features of the clusters and superstructures generated as control samples.
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Affiliation(s)
- M Radtke
- Institute of Organic and Macromolecular Chemistry, Friedrich-Schiller University, Lessingstrasse 12, 07743 Jena, Germany.
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17
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Ionic dye–surfactant nanoassemblies: interplay of electrostatics, hydrophobic effect, and π–π stacking. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3814-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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18
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Lim CP, Zhang S, Zhou Y, Ng WJ. Enhanced carbon capture biosorption through process manipulation. Biochem Eng J 2015. [DOI: 10.1016/j.bej.2014.10.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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19
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Moon JW, Ivanov IN, Joshi PC, Armstrong BL, Wang W, Jung H, Rondinone AJ, Jellison GE, Meyer HM, Jang GG, Meisner RA, Duty CE, Phelps TJ. Scalable production of microbially mediated zinc sulfide nanoparticles and application to functional thin films. Acta Biomater 2014; 10:4474-83. [PMID: 24932768 DOI: 10.1016/j.actbio.2014.06.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Revised: 05/25/2014] [Accepted: 06/04/2014] [Indexed: 11/19/2022]
Abstract
A series of semiconducting zinc sulfide (ZnS) nanoparticles were scalably, reproducibly, controllably and economically synthesized with anaerobic metal-reducing Thermoanaerobacter species. These bacteria reduced partially oxidized sulfur sources to sulfides that extracellularly and thermodynamically incorporated with zinc ions to produce sparingly soluble ZnS nanoparticles with ∼5nm crystallites at yields of ∼5gl(-1)month(-1). A predominant sphalerite formation was facilitated by rapid precipitation kinetics, a low cation/anion ratio and a higher zinc concentration compared to background to produce a naturally occurring hexagonal form at the low temperature, and/or water adsorption in aqueous conditions. The sphalerite ZnS nanoparticles exhibited narrow size distribution, high emission intensity and few native defects. Scale-up and emission tunability using copper doping were confirmed spectroscopically. Surface characterization was determined using Fourier transform infrared and X-ray photoelectron spectroscopies, which confirmed amino acid as proteins and bacterial fermentation end products not only maintaining a nano-dimensional average crystallite size, but also increasing aggregation. The application of ZnS nanoparticle ink to a functional thin film was successfully tested for potential future applications.
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Affiliation(s)
- Ji-Won Moon
- Biosciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA.
| | - Ilia N Ivanov
- Center for Nanophase Materials Sciences Division, ORNL, Oak Ridge, TN 37831, USA
| | - Pooran C Joshi
- Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831, USA
| | - Beth L Armstrong
- Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831, USA
| | - Wei Wang
- Environmental Science Division, ORNL, Oak Ridge, TN 37831, USA
| | - Hyunsung Jung
- Biosciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA
| | - Adam J Rondinone
- Center for Nanophase Materials Sciences Division, ORNL, Oak Ridge, TN 37831, USA
| | - Gerald E Jellison
- Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831, USA
| | - Harry M Meyer
- Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831, USA
| | - Gyoung Gug Jang
- Biosciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA
| | - Roberta A Meisner
- Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831, USA
| | - Chad E Duty
- Materials Science and Technology Division, ORNL, Oak Ridge, TN 37831, USA
| | - Tommy J Phelps
- Biosciences Division, Oak Ridge National Laboratory (ORNL), Oak Ridge, TN 37831, USA
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Kur-Kowalska K, Przybyt M, Ziółczyk P, Sowiński P, Miller E. Fluorescence properties of 3-amino phenylboronic acid and its interaction with glucose and ZnS:Cu quantum dots. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 129:320-325. [PMID: 24747855 DOI: 10.1016/j.saa.2014.03.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/28/2013] [Revised: 03/13/2014] [Accepted: 03/20/2014] [Indexed: 06/03/2023]
Abstract
Preliminary results of a study of the interaction between 3-amino phenylboronic acid and glucose or ZnS:Cu quantum dots are presented in this paper. ZnS:Cu quantum dots with mercaptopropionic acid as a capping agent were obtained and characterized. Quenching of 3-amino phenylboronic acid fluorescence was studied by steady-state and timeresolved measurements. For fluorescence quenching with glucose the results of steady-state measurements fulfill Stern-Volmer equation. The quenching constants are increasing with growing pH. The decay of fluorescence is monoexponential with lifetime about 8.4 ns, which does not depend on pH and glucose concentration indicating static quenching. The quenching constant can be interpreted as apparent equilibrium constant of estrification of boronic group with diol. Quantum dots are also quenching 3-amino phenylboronic acid fluorescence. Fluorescence lifetime, in this case, is slightly decreasing with increasing concentration of quantum dots. The quenching constants are increasing slightly with pH's growth. Quenching mechanism of 3-amino phenylboronic acid fluorescence by quantum dots needs further experiments to be fully explained.
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Affiliation(s)
- Karolina Kur-Kowalska
- Lodz University of Technology, Institute of General Food Chemistry, Stefanowskiego 4/10, 90-924 Lodz, Poland
| | - Małgorzata Przybyt
- Lodz University of Technology, Institute of General Food Chemistry, Stefanowskiego 4/10, 90-924 Lodz, Poland
| | - Paulina Ziółczyk
- Lodz University of Technology, Institute of General Food Chemistry, Stefanowskiego 4/10, 90-924 Lodz, Poland
| | - Przemysław Sowiński
- Centre of Molecular and Macromolecular Studies in Lodz, Sienkiewicza 112, 90-363 Lodz, Poland
| | - Ewa Miller
- Lodz University of Technology, Institute of General Food Chemistry, Stefanowskiego 4/10, 90-924 Lodz, Poland.
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Fratoddi I, Macagnano A, Battocchio C, Zampetti E, Venditti I, Russo MV, Bearzotti A. Platinum nanoparticles on electrospun titania nanofibers as hydrogen sensing materials working at room temperature. NANOSCALE 2014; 6:9177-9184. [PMID: 24981799 DOI: 10.1039/c4nr01400f] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Platinum nanoparticles (PtNPs), with diameters of 3-10 nm, were synthesized by water phase reduction, using 3-mercapto-1-propanesulfonate (3MPS) as a hydrophilic capping agent. PtNPs were deposited by a dipcoating technique on titania nanofibers (TiO2NFs), obtained by electrospinning. The investigated properties of the Pt-TiO2 hybrid at room temperature show that this material combines the properties of photoconduction of titania and the photocatalytic activity of the hybrid. To assess the best performance of Pt-TiO2, different measurements were performed at room temperature, comparing hydrogen response under UV of the uncoated TiO2NFs, compared with the Pt-TiO2 system prepared with two different amounts of PtNPs. During the sensing tests toward hydrogen an enhancement of photoconductivity (150%), an increase in response (400%) and an overall improvement of their dynamic behaviour were observed.
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Affiliation(s)
- Ilaria Fratoddi
- Department of Chemistry, University of Rome Sapiens, P.le A. Moro 5, I-00185 Rome, Italy.
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Ziółczyk P, Kur-Kowalska K, Przybyt M, Miller E. Quantum dots as a possible oxygen sensor. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 126:28-35. [PMID: 24568848 DOI: 10.1016/j.saa.2014.01.112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Revised: 01/15/2014] [Accepted: 01/22/2014] [Indexed: 06/03/2023]
Abstract
Results of studies on optical properties of low toxicity quantum dots (QDs) obtained from copper doped zinc sulfate are discussed in the paper. The effect of copper admixture concentration and solution pH on the fluorescence emission intensity of QDs was investigated. Quenching of QDs fluorescence by oxygen was reported and removal of the oxygen from the environment by two methods was described. In the chemical method oxygen was eliminated by adding sodium sulfite, in the other method oxygen was removed from the solution using nitrogen gas. For elimination of oxygen by purging the solution with nitrogen the increase of fluorescence intensity with decreasing oxygen concentration obeyed Stern-Volmer equation indicating quenching. For the chemical method Stern-Volmer equation was not fulfilled. The fluorescence decays lifetimes were determined and the increase of mean lifetimes at the absence of oxygen support hypothesis that QDs fluorescence is quenched by oxygen.
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Affiliation(s)
- Paulina Ziółczyk
- Institute of General Food Chemistry, Lodz University of Technology, Stefanowskiego 4/10, 90-924 Łódź, Poland
| | - Katarzyna Kur-Kowalska
- Institute of General Food Chemistry, Lodz University of Technology, Stefanowskiego 4/10, 90-924 Łódź, Poland
| | - Małgorzata Przybyt
- Institute of General Food Chemistry, Lodz University of Technology, Stefanowskiego 4/10, 90-924 Łódź, Poland
| | - Ewa Miller
- Institute of General Food Chemistry, Lodz University of Technology, Stefanowskiego 4/10, 90-924 Łódź, Poland.
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Hazra C, Bari S, Kundu D, Chaudhari A, Mishra S, Chatterjee A. Ultrasound-assisted/biosurfactant-templated size-tunable synthesis of nano-calcium sulfate with controllable crystal morphology. ULTRASONICS SONOCHEMISTRY 2014; 21:1117-1131. [PMID: 24412181 DOI: 10.1016/j.ultsonch.2013.12.020] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 12/18/2013] [Accepted: 12/19/2013] [Indexed: 06/03/2023]
Abstract
Nano-sized crystals of alpha calcium sulfate hemihydrate (α-HH) with considerable morphology-dependent properties find promising applications in the clinical fields as a cementitious material. Towards this end, ultrasound-assisted rhamnolipid and surfactin biosurfactant-template route is explored to control the morphology and aspect ratio of nano-CaSO4 by adjusting the mass ratio of rhamnolipid/H2O, surfactin/H2O and rhamnolipid/surfactin. The change in the molar ratio of [SO4(2-)]:[Ca(2+)] results in modification in variable morphology and size of nano-CaSO4 including long, short rods and nanoplates. With increase in the rhamnolipid/H2O ratio from 1.3 to 4.5, the crystal length decreases from 3 μm to 600 nm with the corresponding aspect ratio reduced sharply from 10 to 3. Similarly, the crystal morphology gradually changes from submicrometer-sized long rod to hexagonal plate, and then plate-like appearance with increase in surfactin concentration. The preferential adsorption of rhamnolipid on the side facets and surfactin on the top facets contributes to the morphology control. The process using 50% amplitude with a power input of 45.5 W was found to be the most ideal as observed from the high yields and lower average l/w aspect ratio, leading to more than 94% energy savings as compared to that utilized by the conventional process. As a morphology and crystal habit modifier, effects of Mg(2+) and K(+) ions on α-HH growth were investigated to find an optimal composition of solution for α-HH preparation. Mg(2+) ions apparently show an accelerating effect on the α-HH growth; however, the nucleation of α-HH is probably retarded by K(+) ions. Thus, the present work is a simple, versatile, highly efficient approach to controlling the morphology of α-HH and thereby, offers more opportunities for α-HH multiple applications.
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Affiliation(s)
- Chinmay Hazra
- School of Life Sciences, North Maharashtra University, Jalgaon 425 001, India
| | - Sarang Bari
- University Institute of Chemical Technology, North Maharashtra University, Jalgaon 425 001, India
| | - Debasree Kundu
- School of Life Sciences, North Maharashtra University, Jalgaon 425 001, India
| | - Ambalal Chaudhari
- School of Life Sciences, North Maharashtra University, Jalgaon 425 001, India
| | - Satyendra Mishra
- University Institute of Chemical Technology, North Maharashtra University, Jalgaon 425 001, India
| | - Aniruddha Chatterjee
- University Institute of Chemical Technology, North Maharashtra University, Jalgaon 425 001, India.
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PAL BONAMALI, SINGH ROHIT, SINGLA SHILPA. EFFECT OF Au AND Pt DEPOSITION AND THERMAL TREATMENT ON THE PHOTOCATALYTIC ACTIVITY OF AS-PREPARED ZnS NANOROD. INTERNATIONAL JOURNAL OF NANOSCIENCE 2014. [DOI: 10.1142/s0219581x13500324] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The wurtzite phase of ZnS -nanorods (NRs) (length 100–120 nm and width 10–15 nm) has been prepared by solvothermal method and 1 wt.% Au and Pt nanoparticles (2–5 nm) were photodeposited and sintered at 500°C for 2 h. ZnS -NR exhibits an exciton band at 283 nm and absorption onset at 304 nm (bandgap = 4.06 eV) as compared to 336 nm (bandgap = 3.77 eV) of bulk ZnS , indicating its quantum size effect. The absorption is red shifted to ~350 nm and ~366 nm after Au and Pt deposition, and also sintering led to quench the ZnS absorption band in UV region due to the exciton–plasmon interactions. Photoluminescence (PL) of ZnS -NRs (band at 366–377 nm) is significantly reduced after Au or Pt deposition and sintering. The photocatalytic activity of p-nitrophenol (PNP) degradation has been appreciably improved (rate constants k = 3.6 × 10-3 min-1 and k = 3.6 × 10-3 min-1) after 1 wt.% Pt loading on ZnS followed by sintering at 500°C for 2 h as compared to bare (k = 1.2 × 10-3 min-1) and sintered ZnS (k = 3.3 × 10-3 min-1) catalyst, respectively. Similarly, Au loading and sintering led to increased the k = 2.7 × 10-3 and 4.5 × 10-3 min-1 relative to bare ZnS -NR and direct photolysis (k = 0.3 × 10-3 min-1) of PNP under UV light (10.4 mWcm-2) irradiation. Sintering appreciably improves the ZnS (surface area = 58.9 m2g-1) photoactivity due to better crystallinity and removal of defect sites.
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Affiliation(s)
- BONAMALI PAL
- School of Chemistry and Biochemistry, Thapar University, Patiala 147004, Punjab, India
| | - ROHIT SINGH
- School of Chemistry and Biochemistry, Thapar University, Patiala 147004, Punjab, India
| | - SHILPA SINGLA
- School of Chemistry and Biochemistry, Thapar University, Patiala 147004, Punjab, India
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Reddy DA, Kim DH, Rhee SJ, Lee BW, Liu C. Tunable blue-green-emitting wurtzite ZnS:Mg nanosheet-assembled hierarchical spheres for near-UV white LEDs. NANOSCALE RESEARCH LETTERS 2014; 9:20. [PMID: 24418612 PMCID: PMC3896820 DOI: 10.1186/1556-276x-9-20] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Accepted: 12/27/2013] [Indexed: 05/30/2023]
Abstract
Mg-doped ZnS hierarchical spheres have been synthesized via hydrothermal method using mixed solvents of ethylenediamine and DI water without any surface-active agent. The surface morphology and microstructure studies revealed that the hierarchical spheres were consisted of many well-aligned nanosheets with width 10 nm and length about 50 ~ 100 nm. X-Ray diffraction results show that the ZnS:Mg hierarchical spheres have wurtzite structure with high crystallinity. The absorption edge in the diffuse reflection spectra shifts towards lower wavelength with increasing Mg concentration, indicating an expansion in the bandgap energy that is estimated to be in the range of 3.28 to 3.47 eV. Blue-green photoluminescence with tunable intensity and peak position was observed depending on the Mg content. The Mg2+-activated ZnS phosphor can be good candidates for blue-green components in near-UV white light-emitting diodes.
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Affiliation(s)
| | - Deok Hyeon Kim
- Department of Physics, Hankuk University of Foreign Studies, Gyeonggi 449-791, Republic of Korea
| | - Seuk Joo Rhee
- Department of Physics, Hankuk University of Foreign Studies, Gyeonggi 449-791, Republic of Korea
| | - Bo Wha Lee
- Department of Physics, Hankuk University of Foreign Studies, Gyeonggi 449-791, Republic of Korea
| | - Chunli Liu
- Department of Physics, Hankuk University of Foreign Studies, Gyeonggi 449-791, Republic of Korea
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Garden AL, Scholz K, Schwass DR, Meledandri CJ. Optimized colloidal chemistry for micelle-templated synthesis and assembly of silver nanocomposite materials. Colloids Surf A Physicochem Eng Asp 2014. [DOI: 10.1016/j.colsurfa.2013.09.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Zhai X, Xia Y, Sun D, Xu J. Cd2+Counterion-Assisted Synthesis of Uniform CdS Nanospheres Capped with the Anionic Surfactant Sodium dodecylsulfate. J DISPER SCI TECHNOL 2013. [DOI: 10.1080/01932691.2013.775582] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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28
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Ramanery FP, Mansur AAP, Mansur HS. One-step colloidal synthesis of biocompatible water-soluble ZnS quantum dot/chitosan nanoconjugates. NANOSCALE RESEARCH LETTERS 2013; 8:512. [PMID: 24308633 PMCID: PMC4234014 DOI: 10.1186/1556-276x-8-512] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2013] [Accepted: 11/27/2013] [Indexed: 05/04/2023]
Abstract
Quantum dots (QDs) are luminescent semiconductor nanocrystals with great prospective for use in biomedical and environmental applications. Nonetheless, eliminating the potential cytotoxicity of the QDs made with heavy metals is still a challenge facing the research community. Thus, the aim of this work was to develop a novel facile route for synthesising biocompatible QDs employing carbohydrate ligands in aqueous colloidal chemistry with optical properties tuned by pH. The synthesis of ZnS QDs capped by chitosan was performed using a single-step aqueous colloidal process at room temperature. The nanobioconjugates were extensively characterised by several techniques, and the results demonstrated that the average size of ZnS nanocrystals and their fluorescent properties were influenced by the pH during the synthesis. Hence, novel 'cadmium-free' biofunctionalised systems based on ZnS QDs capped by chitosan were successfully developed exhibiting luminescent activity that may be used in a large number of possible applications, such as probes in biology, medicine and pharmacy.
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Affiliation(s)
- Fábio P Ramanery
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Escola de Engenharia, Federal University of Minas Gerais, Bloco 2, Sala 2233, Av. Antônio Carlos, 6627, Belo Horizonte, Minas Gerais 31270-901, Brazil
| | - Alexandra AP Mansur
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Escola de Engenharia, Federal University of Minas Gerais, Bloco 2, Sala 2233, Av. Antônio Carlos, 6627, Belo Horizonte, Minas Gerais 31270-901, Brazil
| | - Herman S Mansur
- Center of Nanoscience, Nanotechnology and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Escola de Engenharia, Federal University of Minas Gerais, Bloco 2, Sala 2233, Av. Antônio Carlos, 6627, Belo Horizonte, Minas Gerais 31270-901, Brazil
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Kumar S, Gradzielski M, Mehta SK. The critical role of surfactants towards CdS nanoparticles: synthesis, stability, optical and PL emission properties. RSC Adv 2013. [DOI: 10.1039/c2ra21963h] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Precipitation, stabilization and molecular modeling of ZnS nanoparticles in the presence of cetyltrimethylammonium bromide. J Colloid Interface Sci 2012; 377:58-63. [DOI: 10.1016/j.jcis.2012.03.073] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Revised: 03/23/2012] [Accepted: 03/24/2012] [Indexed: 11/20/2022]
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32
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Rudiuk S, Yoshikawa K, Baigl D. Enhancement of DNA compaction by negatively charged nanoparticles: effect of nanoparticle size and surfactant chain length. J Colloid Interface Sci 2011; 368:372-7. [PMID: 22071517 DOI: 10.1016/j.jcis.2011.10.033] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2011] [Revised: 10/12/2011] [Accepted: 10/13/2011] [Indexed: 11/29/2022]
Abstract
We study the compaction of genomic DNA by a series of alkyltrimethylammonium bromide surfactants having different hydrocarbon chain lengths n: dodecyl-(DTAB, n=12), tetradecyl-(TTAB, n=14) and hexadecyl-(CTAB, n=16), in the absence and in the presence of negatively charged silica nanoparticles (NPs) with a diameter in the range 15-100 nm. We show that NPs greatly enhance the ability of all cationic surfactants to induce DNA compaction and that this enhancement increases with an increase in NP diameter. In the absence of NP, the ability of cationic surfactants to induce DNA compaction increases with an increase in n. Conversely, in the presence of NPs, the enhancement of DNA compaction increases with a decrease in n. Therefore, although CTAB is the most efficient surfactant to compact DNA, maximal enhancement by NPs is obtained for the largest NP diameter (here, 100 nm) and the smallest surfactant chain length (here, DTAB). We suggest a mechanism where the preaggregation of surfactants on NP surface mediated by electrostatic interactions promotes cooperative binding to DNA and thus enhances the ability of surfactants to compact DNA. We show that the amplitude of enhancement is correlated with the difference between the surfactant concentration corresponding to aggregation on DNA alone and that corresponding to the onset of adsorption on nanoparticles.
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Affiliation(s)
- Sergii Rudiuk
- Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
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