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Giovannozzi AM, Hornemann A, Pollakowski-Herrmann B, Green FM, Gunning P, Salter TL, Steven RT, Bunch J, Portesi C, Tyler BJ, Beckhoff B, Rossi AM. A methodological inter-comparison study on the detection of surface contaminant sodium dodecyl sulfate applying ambient- and vacuum-based techniques. Anal Bioanal Chem 2018; 411:217-229. [PMID: 30402675 DOI: 10.1007/s00216-018-1431-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 10/07/2018] [Accepted: 10/12/2018] [Indexed: 11/25/2022]
Abstract
Biomedical devices are complex products requiring numerous assembly steps along the industrial process chain, which can carry the potential of surface contamination. Cleanliness has to be analytically assessed with respect to ensuring safety and efficacy. Although several analytical techniques are routinely employed for such evaluation, a reliable analysis chain that guarantees metrological traceability and quantification capability is desirable. This calls for analytical tools that are cascaded in a sensible way to immediately identify and localize possible contamination, both qualitatively and quantitatively. In this systematic inter-comparative approach, we produced and characterized sodium dodecyl sulfate (SDS) films mimicking contamination on inorganic and organic substrates, with potential use as reference materials for ambient techniques, i.e., ambient mass spectrometry (AMS), infrared and Raman spectroscopy, to reliably determine amounts of contamination. Non-invasive and complementary vibrational spectroscopy techniques offer a priori chemical identification with integrated chemical imaging tools to follow the contaminant distribution, even on devices with complex geometry. AMS also provides fingerprint outputs for a fast qualitative identification of surface contaminations to be used at the end of the traceability chain due to its ablative effect on the sample. To absolutely determine the mass of SDS, the vacuum-based reference-free technique X-ray fluorescence was employed for calibration. Convex hip liners were deliberately contaminated with SDS to emulate real biomedical devices with an industrially relevant substance. Implementation of the aforementioned analytical techniques is discussed with respect to combining multimodal technical setups to decrease uncertainties that may arise if a single technique approach is adopted. Graphical abstract ᅟ.
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Affiliation(s)
| | - Andrea Hornemann
- Physikalisch-Technische Bundesanstalt Berlin (PTB), Abbestr. 2-12, 10587, Berlin, Germany
| | | | - Felicia M Green
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Hampton Road, Middlesex, Teddington, TW11 0LW, UK
| | - Paul Gunning
- Smith & Nephew Advanced Wound Management, 101 Hessle Road, Hull, HU3 2BN, UK
| | - Tara L Salter
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Hampton Road, Middlesex, Teddington, TW11 0LW, UK
- Department of Chemistry, School of Life Sciences, University of Sussex, Falmer, Brighton, BN1 9QJ, UK
| | - Rory T Steven
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Hampton Road, Middlesex, Teddington, TW11 0LW, UK
| | - Josephine Bunch
- National Centre of Excellence in Mass Spectrometry Imaging (NiCE-MSI), National Physical Laboratory, Hampton Road, Middlesex, Teddington, TW11 0LW, UK
- Department of Surgery & Cancer, Computational and Systems Medicine, Imperial College London, London, SW7 2AZ, UK
| | - Chiara Portesi
- Quality of Life Division, INRIM, Strada delle Cacce 91, 10135, Turin, Italy
| | | | - Burkhard Beckhoff
- Physikalisch-Technische Bundesanstalt Berlin (PTB), Abbestr. 2-12, 10587, Berlin, Germany
| | - Andrea Mario Rossi
- Quality of Life Division, INRIM, Strada delle Cacce 91, 10135, Turin, Italy
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Pojják K, Fegyver E, Mészáros R. Effect of linear nonionic polymer additives on the kinetic stability of dispersions of poly(diallyldimethylammonium chloride)/sodium dodecylsulfate nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10077-10086. [PMID: 23869814 DOI: 10.1021/la4021542] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this article, the impact of different neutral polymers on the kinetic stability of charge-stabilized poly(diallyldimethylammonium chloride) (PDADMAC)/sodium dodecylsulfate (SDS) colloidal dispersions is analyzed using dynamic light scattering, electrophoretic mobility, turbidity, and coagulation kinetics measurements. Poly(ethyleneoxide) (PEO), poly(vinylpyrrolidone) (PVP), and dextran of comparable molecular masses as well as a higher-molecular-weight dextran sample were tested as nonionic additives. The light scattering and mobility data indicate that the PEO and PVP molecules may adsorb on the surface of the PDADMAC/SDS nanoparticles formed in the presence of excess surfactant. The primary effect of these additives is manifested in enhanced coagulation of the PDADMAC/SDS nanoparticles due to bridging at lower polymer concentrations and depletion flocculation at higher polymer concentrations. These findings are in sharp contrast to the earlier published effect of the same nonionic polymers on the poly(ethyleneimine) (PEI)/SDS colloidal dispersions, which can be sterically stabilized at appropriate PEO or PVP concentrations. However, the adsorption of the investigated dextran samples is negligible on the PDADMAC/SDS nanoparticles. Therefore, dextran molecules may cause only depletion flocculation in the PDADMAC/SDS system in the vicinity of the critical overlap concentration.
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Affiliation(s)
- Katalin Pojják
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, 1117 Budapest, Pázmány Péter Sétány 1/A, Hungary
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Mészáros R. Nonequilibrium Association of Oppositely Charged Macromolecules and Amphiphiles. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.110115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Recently, a novel concept has been proposed to interpret the nonequilibrium character of oppositely charged polyelectrolyte/surfactant mixtures. According to this approach, at low surfactant-to-polyelectrolyte ratios the system is a thermodynamically stable solution. In a given composition range colloidal dispersions of the polyelectrolyte/surfactant nanoparticles are formed. In the presence of surfactant excess, the dispersions can be stabilised via the adsorption of the surfactant ions on the surface of the hydrophobic polyelectrolyte/surfactant nanoparticles. In the presence of polyelectrolyte excess, charge stabilised polyelectrolyte/surfactant dispersions might also be prepared if the charge of the macromolecules is large enough. These latter colloidal dispersions are stabilised by the uncompensated charges of the polyelectrolyte. The colloidal dispersion concept provides several options to control the formation of self-assemblies and the kinetic stability of the mixtures. In this paper, the effect of solution preparation protocols and different additives (including non-ionic polymers or surfactants) on the mentioned properties of oppositely charged macromolecule/surfactant systems is discussed.
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Khoshniyat A, Hashemi A, Sharif A, Aalaie J, Duobis C. Effect of surface modification of bentonite nanoclay with polymers on its stability in an electrolyte solution. POLYMER SCIENCE SERIES B 2012. [DOI: 10.1134/s1560090412010034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Pojják K, Mészáros R. Preparation of stable electroneutral nanoparticles of sodium dodecyl sulfate and branched poly(ethylenimine) in the presence of pluronic F108 copolymer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:14797-14806. [PMID: 22050126 DOI: 10.1021/la203759r] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Mixing of polyelectrolyte solutions with solutions of oppositely charged surfactants usually leads to phase separation in a certain concentration range. However, since the charge-neutralized polyelectrolyte/surfactant nanoparticles might be utilized as versatile nanocarriers of different substances, it would be desirable to prevent their aggregation for some applications. As it was revealed in earlier investigations, the complete suppression of precipitation may be achieved only in mixtures of ionic surfactants and appropriate copolymer polyelectrolytes with nonionic and ionic blocks. In this work, we present a method that could prevent phase separation in mixtures of homopolyelectrolytes and oppositely charged surfactants. Specifically, it is shown that nonaggregating electroneutral nanocomplexes of branched poly(ethylenimine) (PEI) and sodium dodecyl sulfate (SDS) can be prepared in the presence of the amphiphilic triblock copolymer Pluronic F108, provided that an adequate mixing protocol is used for preparation of the PEI/SDS/F108 mixtures.
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Affiliation(s)
- Katalin Pojják
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, 1117 Budapest, Pázmány Péter sétány 1/A, Hungary
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Pojják K, Bertalanits E, Mészáros R. Effect of salt on the equilibrium and nonequilibrium features of polyelectrolyte/surfactant association. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:9139-9147. [PMID: 21702450 DOI: 10.1021/la2021353] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The impact of an electrolyte on aqueous mixtures of oppositely charged macromolecules and surfactants is usually explained by assuming an equilibrium association between the components. In this work, it is shown that the nonequilibrium character of polyelectrolyte/surfactant systems plays a crucial role in the interpretation of the effect of salt. Experimental investigations of mixtures of sodium poly(styrenesulfonate) (PSS) and hexadecyltrimethylammonium bromide (CTAB) reveal two distinct effects of added sodium chloride (NaCl). At small and moderate NaCl concentrations, the major impact of the electrolyte is manifested in the reduction of the kinetically stable composition range in which the PSS/CTAB mixtures are trapped in the nonequilibrium colloidal dispersion state. The application of high salt concentrations, however, primarily affects the equilibrium phase properties through considerably decreasing the amount of surfactant bound to the polyelectrolyte.
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Affiliation(s)
- Katalin Pojják
- Laboratory of Interfaces and Nanosized Systems, Institute of Chemistry, Eötvös Loránd University, 1117 Budapest, Pázmány Péter Sétány 1/A, Hungary
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Ma X, Ashaduzzaman M, Kunitake M, Crombez R, Texter J, Slater L, Mourey T. Stimuli responsive poly(1-[11-acryloylundecyl]-3-methyl-imidazolium bromide): dewetting and nanoparticle condensation phenomena. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:7148-7157. [PMID: 21526809 DOI: 10.1021/la200184c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A stimuli-responsive homopolymer poly(ILBr) is fabricated via a "two-phase" atom transfer radical polymerization (ATRP) process, where ILBr stands for the reactive ionic liquid surfactant, 1-[11-acryloylundecyl]-3-methyl-imidazolium bromide. An extraordinarily wide molecular weight distribution (PDI = 6.0) was obtained by introducing the initiator (4-bromomethyl methyl benzoate) in a heterogeneous two-phase process. The molecular weight distribution of poly(ILBr) was characterized by size-exclusion chromatography (SEC). The resulting homopolymer was found to be surface active and stimuli responsive. Poly(ILBr) films coated on quartz exhibit stimuli-responsive dewetting after ion exchange of Br(-) by PF(6)(-). This dewetting phenomenon can be understood in chain segmental terms as a stimuli-induced structural relaxation and appears to be the first such reported stimuli-responsive polymeric dewetting. Titrating aqueous poly(ILBr) with aqueous bis(2-ethylhexyl)sulfosuccinate induces nanophase separation and results in the condensation of nanoparticles 30-60 nm in diameter.
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Affiliation(s)
- Xiumin Ma
- Coating Research Institute, School of Engineering Technology, Eastern Michigan University, Ypsilanti, Michigan 48197, United States
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