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Peng J, Song X, Li X, Jiang Y, Liu G, Wei Y, Xia Q. Molecular Dynamics Study on the Aggregation Behavior of Triton X Micelles with Different PEO Chain Lengths in Aqueous Solution. Molecules 2023; 28:molecules28083557. [PMID: 37110791 PMCID: PMC10146536 DOI: 10.3390/molecules28083557] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2023] [Revised: 04/02/2023] [Accepted: 04/16/2023] [Indexed: 04/29/2023] Open
Abstract
The aggregation structure of Triton X (TX) amphiphilic molecules in aqueous solution plays an important role in determining the various properties and applications of surfactant solutions. In this paper, the properties of micelles formed by TX-5, TX-114, and TX-100 molecules with different poly(ethylene oxide) (PEO) chain lengths in TX series of nonionic surfactants were studied via molecular dynamics (MD) simulation. The structural characteristics of three micelles were analyzed at the molecular level, including the shape and size of micelles, the solvent accessible surface area, the radial distribution function, the micelle configuration, and the hydration numbers. With the increase of PEO chain length, the micelle size and solvent accessible surface area also increase. The distribution probability of the polar head oxygen atoms on the surface of the TX-100 micelle is higher than that in the TX-5 or TX-114 micelle. In particular, the tail quaternary carbon atoms in the hydrophobic region are mainly located at the micelle exterior. For TX-5, TX-114, and TX-100 micelles, the interactions between micelles and water molecules are also quite different. These structures and comparisons at the molecular level contribute to the further understanding of the aggregation and applications of TX series surfactants.
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Affiliation(s)
- Jin Peng
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Xiaoju Song
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Xin Li
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Yongkang Jiang
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Guokui Liu
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Yaoyao Wei
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
| | - Qiying Xia
- School of Chemistry and Chemical Engineering, Linyi University, Linyi 276000, China
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Yang R, Li Q, Zhou W, Yu S, Liu J. Speciation Analysis of Selenium Nanoparticles and Inorganic Selenium Species by Dual-Cloud Point Extraction and ICP-MS Determination. Anal Chem 2022; 94:16328-16336. [DOI: 10.1021/acs.analchem.2c03018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- Rui Yang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Qingcun Li
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Wenjing Zhou
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing100085, China
| | - Sujuan Yu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
| | - Jingfu Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing100085, China
- University of Chinese Academy of Sciences, Beijing100049, China
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Andrunik M, Bajda T. Modification of Bentonite with Cationic and Nonionic Surfactants: Structural and Textural Features. MATERIALS 2019; 12:ma12223772. [PMID: 31744177 PMCID: PMC6888449 DOI: 10.3390/ma12223772] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 11/08/2019] [Accepted: 11/14/2019] [Indexed: 11/16/2022]
Abstract
Surfactant-modified clay minerals are known for their good sorption properties of both organic and inorganic compounds from aqueous solutions. However, the current knowledge regarding the effect of both cationic and nonionic surfactants on the properties of bentonite is still insufficient. Bentonite, with montmorillonite as the base clay, was modified with hexadecethyltrimethylammonium bromide (a cationic surfactant) in the amount of 1.0 cation exchange capacity (CEC) of bentonite and varying concentrations of t-octylphenoxypolyethoxyethanol (Triton X-100, a nonionic surfactant). We aimed to improve the understanding of the effect of nonionic and cationic surfactants on clay minerals. The modified bentonites were characterized by X-ray diffraction (XRD), thermogravimetric analysis/differential thermal analysis (TG/DTA), Fourier transform infrared spectrometry (FTIR), field emission scanning electron microscopy (SEM) and specific surface area and pore volume (BET). According to our results, the presence of a cationic surfactant significantly increased the amount of the adsorbed nonionic surfactant. Moreover, an increase in the concentration of nonionic surfactants is also associated with an increase in the effectiveness of the modification process. Our results indicate that the amount of nonionic surfactant used has a significant effect on the properties of the obtained hybrid material. Modification of bentonite with a nonionic surfactant did not cause an expansion of the interlayer space of smectite, regardless of the presence of a cationic surfactant. The modification process was found to significantly decrease the specific surface area of bentonite. Improvement of hydrophobic properties and thermal stability was also observed.
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Silva BFB, Zepeda-Rosales M, Venkateswaran N, Fletcher BJ, Carter LG, Matsui T, Weiss TM, Han J, Li Y, Olsson U, Safinya CR. Nematic director reorientation at solid and liquid interfaces under flow: SAXS studies in a microfluidic device. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:4361-71. [PMID: 25396748 PMCID: PMC4400036 DOI: 10.1021/la5034614] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
In this work we investigate the interplay between flow and boundary condition effects on the orientation field of a thermotropic nematic liquid crystal under flow and confinement in a microfluidic device. Two types of experiments were performed using synchrotron small-angle X-ray-scattering (SAXS). In the first, a nematic liquid crystal flows through a square-channel cross section at varying flow rates, while the nematic director orientation projected onto the velocity/velocity gradient plane is measured using a 2D detector. At moderate-to-high flow rates, the nematic director is predominantly aligned in the flow direction, but with a small tilt angle of ∼±11° in the velocity gradient direction. The director tilt angle is constant throughout most of the channel width but switches sign when crossing the center of the channel, in agreement with the Ericksen-Leslie-Parodi (ELP) theory. At low flow rates, boundary conditions begin to dominate, and a flow profile resembling the escaped radial director configuration is observed, where the director is seen to vary more smoothly from the edges (with homeotropic alignment) to the center of the channel. In the second experiment, hydrodynamic focusing is employed to confine the nematic phase into a sheet of liquid sandwiched between two layers of Triton X-100 aqueous solutions. The average nematic director orientation shifts to some extent from the flow direction toward the liquid boundaries, although it remains unclear if one tilt angle is dominant through most of the nematic sheet (with abrupt jumps near the boundaries) or if the tilt angle varies smoothly between two extreme values (∼90 and 0°). The technique presented here could be applied to perform high-throughput measurements for assessing the influence of different surfactants on the orientation of nematic phases and may lead to further improvements in areas such as boundary lubrication and clarifying the nature of defect structures in LC displays.
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Affiliation(s)
- Bruno F. B. Silva
- Department of Materials, Department
of Physics and Department of
Molecular, Cellular, and Developmental Biology and Materials Research Laboratory, University of California, Santa Barbara, California 93106, United States
- Division
of Physical Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
- E-mail:
| | - Miguel Zepeda-Rosales
- Department of Materials, Department
of Physics and Department of
Molecular, Cellular, and Developmental Biology and Materials Research Laboratory, University of California, Santa Barbara, California 93106, United States
| | - Neeraja Venkateswaran
- Department of Materials, Department
of Physics and Department of
Molecular, Cellular, and Developmental Biology and Materials Research Laboratory, University of California, Santa Barbara, California 93106, United States
| | - Bretton J. Fletcher
- Department of Materials, Department
of Physics and Department of
Molecular, Cellular, and Developmental Biology and Materials Research Laboratory, University of California, Santa Barbara, California 93106, United States
| | | | - Tsutomu Matsui
- Stanford
Synchrotron Radiation Lightsource, SLAC
National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Thomas M. Weiss
- Stanford
Synchrotron Radiation Lightsource, SLAC
National Accelerator Laboratory, Menlo Park, California 94025, United States
| | - Jun Han
- Paul
Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Youli Li
- Department of Materials, Department
of Physics and Department of
Molecular, Cellular, and Developmental Biology and Materials Research Laboratory, University of California, Santa Barbara, California 93106, United States
| | - Ulf Olsson
- Division
of Physical Chemistry, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden
| | - Cyrus R. Safinya
- Department of Materials, Department
of Physics and Department of
Molecular, Cellular, and Developmental Biology and Materials Research Laboratory, University of California, Santa Barbara, California 93106, United States
- E-mail:
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Kardani F, Daneshfar A, Sahrai R. Determination of β-sitosterol and cholesterol in oils after reverse micelles with Triton X-100 coupled with ultrasound-assisted back-extraction by a water/chloroform binary system prior to gas chromatography with flame ionization detection. Anal Chim Acta 2011; 701:232-7. [DOI: 10.1016/j.aca.2011.05.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Revised: 05/23/2011] [Accepted: 05/27/2011] [Indexed: 11/24/2022]
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Kungsanant S, Kitiyanan B, Rirksomboon T, Osuwan S, Scamehorn JF. Toluene removal from nonionic surfactant coacervate phase solutions by vacuum stripping. Sep Purif Technol 2008. [DOI: 10.1016/j.seppur.2008.05.020] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Alvarez-Lorenzo C, Gómez-Amoza JL, Martínez-Pacheco R, Souto C, Concheiro A. Microviscosity of hydroxypropylcellulose gels as a basis for prediction of drug diffusion rates. Int J Pharm 1999; 180:91-103. [PMID: 10089296 DOI: 10.1016/s0378-5173(98)00409-8] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
This study investigated the influence of the rheological properties of hydroxypropylcellulose (HPC) gels on the in vitro release of theophylline included in the gel at 0.2 g/l. Experiments were performed with six HPC varieties (mean molecular weight between 5x105 and 1.2x106, nominal viscosity between 100 and 4000 mPa.s) at concentrations of 0-2% (w/w). Theophylline diffusion coefficients at 37 degrees C ranged from 3.5x10-7 to 1.1x10-3 cm2/min, and were in all cases markedly higher than those predicted on the basis of gel macroviscosity as determined by capillary viscometry. In general, the theophylline diffusion coefficient declined exponentially with HPC concentration; in the case of the lowest-molecular-weight HPC, however, the diffusion coefficient remained constant to HPC concentrations of up to 0.8%, probably because of the high entanglement concentration of the HPC. Gel microviscosities as determined by dynamic light scattering (DLS) with latex microspheres (162 nm diameter) were considerably lower than the macroviscosities determined by capillary viscometry, and similar to microviscosities estimated on the basis of theophylline diffusion. Nevertheless, macroviscosity was correlated with microviscosity, suggesting that it is of value for approximate estimates of rates of diffusion of theophylline from HPC gels.
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Affiliation(s)
- C Alvarez-Lorenzo
- Departamento de Farmacia y Tecnología Farmacéutica, Facultad de Farmacia, Universidad de Santiago de Compostela, 15706, Santiago de Compostela, Spain
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Gawronski M, Conrad H, Springer T. Proton−Deuteron and H2O−D2O Exchange in Polysaccharides by X-ray and Small-Angle Neutron Scattering. Macromolecules 1998. [DOI: 10.1021/ma970110z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael Gawronski
- Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Harald Conrad
- Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
| | - Tasso Springer
- Institut für Festkörperforschung, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany
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