51
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A Small-Angle Neutron Scattering Environment for In-Situ Observation of Chemical Processes. Sci Rep 2018; 8:7299. [PMID: 29740024 PMCID: PMC5940810 DOI: 10.1038/s41598-018-24718-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Accepted: 04/03/2018] [Indexed: 12/18/2022] Open
Abstract
A new sample environment for the observation of ongoing chemical reactions is introduced for small-angle neutron scattering (SANS) experiments which enables structural changes to be followed continuously across a wide Q-range in response to changes in the chemical environment. The approach is demonstrated and validated by performing single and multiple potentiometric titrations on an aqueous anionic surfactant solution (oligo-oxyethylene alkylether carboxylic acid in D2O) with addition times varying from 1 s to 2 h. It is shown that the continuous flow set-up offers considerable advantages over classical ‘static’ measurements with regards to sample throughput, compositional precision and the ability to observe fast structural transitions. Finally, the capabilities and ongoing optimisation of the sample environment are discussed with reference to potential applications in the fields of biology, colloidal systems and complex soft matter.
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52
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Vierros S, Sammalkorpi M. Effects of 1-hexanol on C 12E 10 micelles: a molecular simulations and light scattering study. Phys Chem Chem Phys 2018; 20:6287-6298. [PMID: 29431748 DOI: 10.1039/c7cp07511a] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The micelles of the non-ionic C12E10 surfactant and 1-hexanol as an aqueous solution additives are studied toward the purpose of understanding the role of alcohol additives in tuning the characteristics of alkyl-ethoxylate micellar systems. Our dynamic light scattering and cloud point experiments show that the addition of hexanol induces a response similar to an increase of temperature. We associate the change with increased attraction between the micelles at low to moderate hexanol loadings and a potential increase of the aggregate size at a high hexanol-to-surfactant ratio. Detailed molecular dynamic simulation characterization shows that hexanol solubilizes to a micelle palisade layer when the hexanol-to-C12E10 ratio is less than or equal to 0.5 while swollen micelles, in which a part of hexanol forms an oil core, are present when the ratio increases above approximately 1.5. The simulations indicate that the surface of the micelles is rough. Formation of reverse hexanol structures akin to those found in bulk octanol is observed in the oil core. Molecular simulations associate the increase in attraction between micelles observed via the experiments with decreased chain density in the headgroup region. This density decrease is caused by hexanol molecules solubilized between neighbouring surfactants. Altogether, these findings provide detailed physical characterization of the effect of an archetypal solution additive, hexanol, on an alkyl ethoxylate micelle system. These findings could bear a significance in designing micellar and emulsion based systems with desired solution characteristics or properties for e.g. drug delivery, catalysis, or platforms for green chemistry reactions.
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Affiliation(s)
- Sampsa Vierros
- Department of Chemistry and Materials Science, School of Chemical Engineering, Aalto University, P. O. Box 16100, FI-00076 Aalto, Finland.
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53
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Yang J, Yun L, Zhao G, Zhang F, Chen Y, Wang C. Fabrication of pH-responsive system based on cationic gemini surfactant/sodium octanedioate and its application on controlled release of paclitaxel. Colloids Surf A Physicochem Eng Asp 2018. [DOI: 10.1016/j.colsurfa.2017.11.051] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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54
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Arkhipov VP, Filippov A. The cloud point of aqueous solutions of ethoxylated monoalkylphenols in the individual state and in the presence of electrolytes. J DISPER SCI TECHNOL 2017. [DOI: 10.1080/01932691.2017.1413656] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Victor P. Arkhipov
- Department of Physics, Kazan National Research Technological University, Kazan, Russia
| | - Andrei Filippov
- Institute of Physics, Kazan Federal University, Kazan, Russia
- Chemistry of Interfaces, Luleå University of Technology, Luleå, Sweden
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55
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Chiappisi L. Polyoxyethylene alkyl ether carboxylic acids: An overview of a neglected class of surfactants with multiresponsive properties. Adv Colloid Interface Sci 2017; 250:79-94. [PMID: 29056232 DOI: 10.1016/j.cis.2017.10.001] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Revised: 10/07/2017] [Accepted: 10/10/2017] [Indexed: 12/14/2022]
Abstract
In this work, an overview on aqueous solutions of polyoxyethylene alkyl ether carboxylic acids is given. Unique properties arise from the combination of the nonionic, temperature-responsive polyoxyethylene block with the weakly ionic, pH-responsive carboxylic acid termination in a single surfactant headgroup. Accordingly, this class of surfactant finds broad application across very different sectors. Despite their large use on an industrial and a technical scale, the literature lacks a systematic and detailed characterization of their physico-chemical properties which is provided herein. In addition, a comprehensive overview is given of their self-assembly and interfacial behavior, of their use as colloidal building blocks and for large-scale applications.
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Affiliation(s)
- Leonardo Chiappisi
- Technische Universität Berlin, Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Straße des 17. Juni 124, Sekr. TC7, D-10623 Berlin, Germany; Institut Max von Laue - Paul Langevin, Large Scale Structures Group, 71 avenue des Martyrs, Grenoble Cedex 9 38042, France.
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56
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Roy A, Pyne A, Pal P, Dhara S, Sarkar N. Effect of Vitamin E and a Long-Chain Alcohol n-Octanol on the Carbohydrate-Based Nonionic Amphiphile Sucrose Monolaurate-Formulation of Newly Developed Niosomes and Application in Cell Imaging. ACS OMEGA 2017; 2:7637-7646. [PMID: 30023559 PMCID: PMC6044762 DOI: 10.1021/acsomega.7b00744] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 10/26/2017] [Indexed: 06/08/2023]
Abstract
We have introduced new niosome formulations using sucrose monolaurate, vitamin E and n-octanol as independent additives. Detailed characterization techniques including turbidity, dynamic light scattering, transmission electron microscopy, ξ potential, and proton nuclear magnetic resonance measurements have been introduced to monitor the morphological transition of the carbohydrate-based micellar assembly into niosomal aggregates. Moreover, microheterogeneity of these niosomal aggregates has been investigated through different fluorescence spectroscopic techniques using a hydrophobic probe molecule coumarin 153 (C153). Further, it has been observed that vitamin E and octanol have an opposing effect on the rotational motion of C153 in the respective niosome assemblies. The time-resolved anisotropy studies suggest that incorporation of vitamin E and octanol into the surfactant aggregates results in slower and faster rotational motion of C153, respectively, compared to the micellar assemblies. Moreover, the ability to entrap a probe molecule by these niosomes is utilized to encapsulate and deliver the anticancer drug doxorubicin inside the mammalian cells which is monitored through fluorescence microscopic images. Interestingly, the niosome composed of vitamin E demonstrated better cytocompatibility toward primary chondrocyte cell lines compared to the octanol-forming niosome.
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Affiliation(s)
- Arpita Roy
- Department
of Chemistry and School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, West
Bengal, India
| | - Arghajit Pyne
- Department
of Chemistry and School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, West
Bengal, India
| | - Pallabi Pal
- Department
of Chemistry and School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, West
Bengal, India
| | - Santanu Dhara
- Department
of Chemistry and School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, West
Bengal, India
| | - Nilmoni Sarkar
- Department
of Chemistry and School of Medical Science and Technology, Indian Institute of Technology Kharagpur, Kharagpur 721302, West
Bengal, India
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57
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Senac C, Urbach W, Kurtisovski E, Hünenberger PH, Horta BAC, Taulier N, Fuchs PFJ. Simulating Bilayers of Nonionic Surfactants with the GROMOS-Compatible 2016H66 Force Field. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:10225-10238. [PMID: 28832154 DOI: 10.1021/acs.langmuir.7b01348] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Polyoxyethylene glycol alkyl ether amphiphiles (CiEj) are important nonionic surfactants, often used for biophysical and membrane protein studies. In this work, we extensively test the GROMOS-compatible 2016H66 force field in molecular dynamics simulations involving the lamellar phase of a series of CiEj surfactants, namely C12E2, C12E3, C12E4, C12E5, and C14E4. The simulations reproduce qualitatively well the monitored structural properties and their experimental trends along the surfactant series, although some discrepancies remain, in particular in terms of the area per surfactant, the equilibrium phase of C12E5, and the order parameters of C12E3, C12E4, and C12E5. The polar head of the CiEj surfactants is highly hydrated, almost like a single polyethyleneoxide (PEO) molecule at full hydration, resulting in very compact conformations. Within the bilayer, all CiEj surfactants flip-flop spontaneously within tens of nanoseconds. Water-permeation is facilitated, and the bending rigidity is 4 to 5 times lower than that of typical phospholipid bilayers. In line with another recent theoretical study, the simulations show that the lamellar phase of CiEj contains large hydrophilic pores. These pores should be abundant in order to reproduce the comparatively low NMR order parameters. We show that their contour length is directly correlated to the order parameters, and we estimate that they should occupy approximately 7-10% of the total membrane area. Due to their highly dynamic nature (rapid flip-flops, high water permeability, observed pore formation), CiEj surfactant bilayers are found to represent surprisingly challenging systems in terms of modeling. Given this difficulty, the results presented here show that the 2016H66 parameters, optimized independently considering pure-liquid as well as polar and nonpolar solvation properties of small organic molecules, represent a good starting point for simulating these systems.
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Affiliation(s)
- Caroline Senac
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale , F-75006 Paris, France
| | - Wladimir Urbach
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale , F-75006 Paris, France
- Laboratoire de Physique Statistique, École Normale Supérieure, PSL Research University; Université Paris Diderot, Sorbonne Paris-Cité; Sorbonne Universités UPMC Univ Paris 06, CNRS , 24 rue Lhomond, 75005 Paris, France
| | - Erol Kurtisovski
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale , F-75006 Paris, France
- Laboratoire de Physique Statistique, École Normale Supérieure, PSL Research University; Université Paris Diderot, Sorbonne Paris-Cité; Sorbonne Universités UPMC Univ Paris 06, CNRS , 24 rue Lhomond, 75005 Paris, France
| | | | - Bruno A C Horta
- Instituto de Química, Universidade Federal do Rio de Janeiro , Rio de Janeiro 21941-909, Brazil
| | - Nicolas Taulier
- Sorbonne Universités, UPMC Univ Paris 06, CNRS, INSERM, Laboratoire d'Imagerie Biomédicale , F-75006 Paris, France
| | - Patrick F J Fuchs
- Institut Jacques Monod, UMR 7592 CNRS, Université Paris Diderot , Sorbonne Paris Cité, F-75205 Paris, France
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58
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Predicting Critical Micelle Concentrations with Molecular Dynamics Simulations and COSMOmic. CHEM-ING-TECH 2017. [DOI: 10.1002/cite.201700061] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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59
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Liu N, He Q, Wang Y, Bu W. Stepwise self-assembly of a block copolymer-platinum(ii) complex hybrid in solvents of variable quality: from worm-like micelles to free-standing sheets to vesicle-like nanostructures. SOFT MATTER 2017; 13:4791-4798. [PMID: 28676879 DOI: 10.1039/c7sm01055a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The self-assembly process of formation of worm-like micelles of a block copolymer-platinum(ii) complex hybrid is investigated with respect to the influence of solvent quality. When the solvent quality is moderately weakened, unilamellar free-standing sheets are achieved, in which the worm-like micelles snap off to form star micelles together with a few short worms. Extremely worsened solvent quality leads to unilamellar vesicle-like nanostructures, onto which only star micelles emerged. With the intermediate solvent quality, the sheets coexist with the vesicle-like nanostructures. This is well correlated with mechanistic insights regarding the morphological transition from sheet- to vesicle-like nanoassemblies. In these aggregates, short worms and star micelles still hold their core-shell structures. Furthermore, these unconventional superstructures are well interrelated with their luminescence properties. This result challenges the conventional paradigm of the amphiphilic self-assembly of surfactants and block copolymers in selective solvents, where they form bilayered nanostructures and are required universally to be rearranged during the morphological transition from micelles to vesicles.
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Affiliation(s)
- Nijuan Liu
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou City, Gansu Province, China.
| | - Qun He
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou City, Gansu Province, China.
| | - Yongyue Wang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou City, Gansu Province, China.
| | - Weifeng Bu
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou City, Gansu Province, China.
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60
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Ritter E, Racheva R, Jakobtorweihen S, Smirnova I. Influence of d -glucose as additive on thermodynamics and physical properties of aqueous surfactant two-phase systems for the continuous micellar extraction. Chem Eng Res Des 2017. [DOI: 10.1016/j.cherd.2017.02.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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61
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Yadav SK, Kumar S. Counterion-specific clouding in aqueous anionic surfactant: a case of Hofmeister-like series. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4074-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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62
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Qu M, Chen S, Ma W, Chen J, Kong K, Zhang F, Li H, Hou Z, Zhang XM. Phase Transfer of Nanoparticles Using an Amphiphilic Ionic Liquid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:13746-13751. [PMID: 27958759 DOI: 10.1021/acs.langmuir.6b03742] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The phase transfer of nanoparticles (NPs) from water to organic solvents by an amphiphilic room-temperature ionic liquid (IL) was reported. The geminal IL modified with Pluronic P123 stabilizes a variety of NPs of different size and nature, such as Pd, Au, Ag, and SiO2 NPs. Their phase transfer into a hydrophobic environment was realized by raising the temperature and adding salts (such as NaCl and KBr), both of which have a common effect of breaking the hydrogen bonds of the IL with H2O. A more straightforward method of using an organic solvent working as a hydrogen bond donor (such as butyl alcohol) was then proposed. In this case, NaCl was no longer required. To further apply this strategy to the organic solvents that are generally incapable of forming hydrogen bonds (e.g., toluene), a small quantity of benzoic acid was added to the organic phase. By forming hydrogen bonds from benzoic acid to the IL, an even more facile approach was provided. FT-IR confirmed the hydrogen bonding between them. The phase-transfer protocol does not rely on coordination bonding of ligands with a specific metal and is capable of the phase transfer of objects with large sizes and different natures. Thus, it has the potential for wide application.
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Affiliation(s)
- Mei Qu
- Institute of Crystalline Materials, Shanxi University , Taiyuan 030006, Shanxi, China
| | - Shuai Chen
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan 030001, Shanxi, China
| | - Wenbao Ma
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology , Shanghai 200237, China
| | - Jiangang Chen
- State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences , Taiyuan 030001, Shanxi, China
| | - Kang Kong
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology , Shanghai 200237, China
| | - Fengwei Zhang
- Institute of Crystalline Materials, Shanxi University , Taiyuan 030006, Shanxi, China
| | - Huan Li
- Institute of Crystalline Materials, Shanxi University , Taiyuan 030006, Shanxi, China
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology , Shanghai 200237, China
| | - Zhenshan Hou
- Key Laboratory for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology , Shanghai 200237, China
| | - Xian-Ming Zhang
- Institute of Crystalline Materials, Shanxi University , Taiyuan 030006, Shanxi, China
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63
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Zhang L, Zheng W, Jiu H, Ni C, Chang J, Qi G. The synthesis of NiO and NiCo 2 O 4 nanosheets by a new method and their excellent capacitive performance for asymmetric supercapacitor. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.08.099] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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64
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Zhu Z, Chueh CC, Zhang G, Huang F, Yan H, Jen AKY. Improved Ambient-Stable Perovskite Solar Cells Enabled by a Hybrid Polymeric Electron-Transporting Layer. CHEMSUSCHEM 2016; 9:2586-2591. [PMID: 27561451 DOI: 10.1002/cssc.201600921] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Indexed: 06/06/2023]
Abstract
In this work, an efficient inverted perovskite solar cell with decent ambient stability is successfully demonstrated by employing an n-type polymer, poly{[N,N'-bis(2-octyldodecyl)-1,4,5,8-naphthalene diimide-2,6-diyl]-alt-5,5'-(2,2'-bithiophene)} (N2200), as the electron-transporting layer (ETL). The device performance can be further enhanced from a power conversion efficiency (PCE) of 15 to 16.8 % by tailoring the electronic properties of N2200 with a polymeric additive, poly[9,9-bis(6'-(N,N-diethylamino)propyl)-fluorene-alt-9,9-bis(3-ethyl(oxetane-3-ethyloxy)-hexyl) fluorene] (PFN-Ox). More importantly, the device derived from this hybrid ETL can maintain good ambient stability inherent from the pristine N2200 ETL, for which 60-70 % of initial PCE can be retained after being stored in air with 10-20 % humidity for 45 days.
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Affiliation(s)
- Zonglong Zhu
- Department of Materials Science and Engineering, Department of Chemistry, University of Washington, Seattle, WA, 98195, USA
| | - Chu-Chen Chueh
- Department of Materials Science and Engineering, Department of Chemistry, University of Washington, Seattle, WA, 98195, USA
| | - Guangye Zhang
- Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong
| | - Fei Huang
- Institute of Polymer Optoelectronic Materials and Devices, Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, South China University of Technology, Guangzhou, 510640, P.R. China
| | - He Yan
- Department of Chemistry and Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration & Reconstruction, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
| | - Alex K-Y Jen
- Department of Materials Science and Engineering, Department of Chemistry, University of Washington, Seattle, WA, 98195, USA.
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65
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Kundu K, Das A, Bardhan S, Chakraborty G, Ghosh D, Kar B, Saha SK, Senapati S, Mitra RK, Paul BK. The mixing behaviour of anionic and nonionic surfactant blends in aqueous environment correlates in fatty acid ester medium. Colloids Surf A Physicochem Eng Asp 2016. [DOI: 10.1016/j.colsurfa.2016.05.078] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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66
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Xing P, Zhao Y. Multifunctional Nanoparticles Self-Assembled from Small Organic Building Blocks for Biomedicine. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2016; 28:7304-7339. [PMID: 27273862 DOI: 10.1002/adma.201600906] [Citation(s) in RCA: 117] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 03/17/2016] [Indexed: 06/06/2023]
Abstract
Supramolecular self-assembly shows significant potential to construct responsive materials. By tailoring the structural parameters of organic building blocks, nanosystems can be fabricated, whose performance in catalysis, energy storage and conversion, and biomedicine has been explored. Since small organic building blocks are structurally simple, easily modified, and reproducible, they are frequently employed in supramolecular self-assembly and materials science. The dynamic and adaptive nature of self-assembled nanoarchitectures affords an enhanced sensitivity to the changes in environmental conditions, favoring their applications in controllable drug release and bioimaging. Here, recent significant research advancements of small-organic-molecule self-assembled nanoarchitectures toward biomedical applications are highlighted. Functionalized assemblies, mainly including vesicles, nanoparticles, and micelles are categorized according to their topological morphologies and functions. These nanoarchitectures with different topologies possess distinguishing advantages in biological applications, well incarnating the structure-property relationship. By presenting some important discoveries, three domains of these nanoarchitectures in biomedical research are covered, including biosensors, bioimaging, and controlled release/therapy. The strategies regarding how to design and characterize organic assemblies to exhibit biomedical applications are also discussed. Up-to-date research developments in the field are provided and research challenges to be overcome in future studies are revealed.
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Affiliation(s)
- Pengyao Xing
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore
- School of Chemistry and Chemical Engineering and Key Laboratory of Colloid and Interface Chemistry of Ministry of Education, Shandong University, Jinan, 250100, P. R. China
| | - Yanli Zhao
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, 637371, Singapore.
- School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798, Singapore.
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67
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Can cloud point-based enrichment, preservation, and detection methods help to bridge gaps in aquatic nanometrology? Anal Bioanal Chem 2016; 408:7551-7557. [PMID: 27558100 PMCID: PMC5061829 DOI: 10.1007/s00216-016-9873-5] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 08/02/2016] [Accepted: 08/10/2016] [Indexed: 11/18/2022]
Abstract
Coacervate-based techniques are intensively used in environmental analytical chemistry to enrich and extract different kinds of analytes. Most methods focus on the total content or the speciation of inorganic and organic substances. Size fractionation is less commonly addressed. Within coacervate-based techniques, cloud point extraction (CPE) is characterized by a phase separation of non-ionic surfactants dispersed in an aqueous solution when the respective cloud point temperature is exceeded. In this context, the feature article raises the following question: May CPE in future studies serve as a key tool (i) to enrich and extract nanoparticles (NPs) from complex environmental matrices prior to analyses and (ii) to preserve the colloidal status of unstable environmental samples? With respect to engineered NPs, a significant gap between environmental concentrations and size- and element-specific analytical capabilities is still visible. CPE may support efforts to overcome this “concentration gap” via the analyte enrichment. In addition, most environmental colloidal systems are known to be unstable, dynamic, and sensitive to changes of the environmental conditions during sampling and sample preparation. This delivers a so far unsolved “sample preparation dilemma” in the analytical process. The authors are of the opinion that CPE-based methods have the potential to preserve the colloidal status of these instable samples. Focusing on NPs, this feature article aims to support the discussion on the creation of a convention called the “CPE extractable fraction” by connecting current knowledge on CPE mechanisms and on available applications, via the uncertainties visible and modeling approaches available, with potential future benefits from CPE protocols.
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68
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Wang L, Zhao W, Dong R, Hao J. Phase Structure Transition and Properties of Salt-Free Phosphoric Acid/Non-ionic Surfactants in Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:8366-8373. [PMID: 27490998 DOI: 10.1021/acs.langmuir.6b01596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Precise control of phase structure transition for the synthesis of multi-dimensional soft materials is a fascinating target in amphiphilic molecule self-assembly. Here, we demonstrate a spontaneous formation of a closely packed lamellar phase consisting of uni- and multi-lamellar vesicles through the incorporation of a small amount of an extractant, di(2-ethylhexyl)phosphoric acid (DEHPA), into the highly swollen, planar lamellar phase of a non-ionic tetraethylene glycol monododecyl ether (C12EO4) surfactant in water. It is figured out that the introduction of negative membrane charges results in the electrostatic repulsion among the lamellae, which suppresses the Helfrich undulation and induces a phase structure transition from planar lamellae to closely packed vesicles. Our results provide important insight into amphiphilic molecule self-assembly, where additives and pH can satisfy the opportunities for the precise tuning of the lamellar structures, which makes a way for the development of lamellar soft materials.
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Affiliation(s)
- Lihuan Wang
- Key Laboratory of Colloid and Interface Chemistry and Key Laboratory of Special Aggregated Materials, Ministry of Education, Shandong University , Jinan, Shandong 250100, People's Republic of China
| | - Wenrong Zhao
- Key Laboratory of Colloid and Interface Chemistry and Key Laboratory of Special Aggregated Materials, Ministry of Education, Shandong University , Jinan, Shandong 250100, People's Republic of China
| | - Renhao Dong
- Key Laboratory of Colloid and Interface Chemistry and Key Laboratory of Special Aggregated Materials, Ministry of Education, Shandong University , Jinan, Shandong 250100, People's Republic of China
| | - Jingcheng Hao
- Key Laboratory of Colloid and Interface Chemistry and Key Laboratory of Special Aggregated Materials, Ministry of Education, Shandong University , Jinan, Shandong 250100, People's Republic of China
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69
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Hirose Y, Taira T, Sakai K, Sakai H, Endo A, Imura T. Structures and Surface Properties of "Cyclic" Polyoxyethylene Alkyl Ethers: Unusual Behavior of Cyclic Surfactants in Water. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:8374-8382. [PMID: 27462805 DOI: 10.1021/acs.langmuir.6b01553] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The cyclization of amphiphiles has emerged as an attractive strategy for inducing remarkable properties in these materials without changing their chemical composition. In this study, we successfully synthesized three cyclic polyoxyethylene dodecyl ethers (c-POEC12's) with different ring sizes and explored the effects of their topology on their surface and self-assembly properties related to their function, comparing them with those of their linear counterparts (l-POEC12's). The surface activity of the c-POEC12's remained almost constant despite the change in their hydrophobic and hydrophilic balance (HLB) value, while that of the l-POEC12's decreased with an increase in the HLB value as general surfactants. In contrast to the normal micelles seen in the case of the l-POEC12's (3.4-9.7 nm), the cyclization of the POEC12's resulted in the formation of large spherical structures 72.8-256.8 nm in size. It also led to a dramatic decrease of 28 °C in the cloud point temperature. Furthermore, the cyclization of the POEC12's markedly suppressed the rate of protease hydrolysis caused by the surfactants. The initial rate of reduction of a detergent enzyme from Bacillus licheniformis was increased by more than 40% in the case of c-POE600C12 and c-POE1000C12, even though they exhibited surface activities almost equal to or higher than those of their linear counterparts. These results suggest that cyclization induces unusual aqueous behaviors in POEC12, making the surfactant milder with respect to detergent enzymes while ensuring it exhibits increased surface activity.
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Affiliation(s)
- Yuki Hirose
- Faculty of Science and Technology, Tokyo University of Science , 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Toshiaki Taira
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST) , Central 5-2, 1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Kenichi Sakai
- Faculty of Science and Technology, Tokyo University of Science , 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Hideki Sakai
- Faculty of Science and Technology, Tokyo University of Science , 2641 Yamazaki, Noda, Chiba 278-8510, Japan
| | - Akira Endo
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST) , Central 5-2, 1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Tomohiro Imura
- Research Institute for Chemical Process Technology, National Institute of Advanced Industrial Science and Technology (AIST) , Central 5-2, 1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
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70
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Wijaya EC, Separovic F, Drummond CJ, Greaves TL. Micelle formation of a non-ionic surfactant in non-aqueous molecular solvents and protic ionic liquids (PILs). Phys Chem Chem Phys 2016; 18:24377-86. [PMID: 27533137 DOI: 10.1039/c6cp03332f] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Many ionic liquids and low molecular weight polar solvents have been reported to support amphiphile self-assembly, with most of these reported for the first time in the last decade. This phenomenon is attributed to the solvophobic effect (analogous to the hydrophobic effect in water). However, to date there has been no systematic study which evaluates micelle formation in a large library of non-aqueous solvents. Here we investigate micelle formation of a non-ionic amphiphile, hexa-ethyleneglycol mono n-dodecyl ether, C12E6, in a diverse range of molecular solvents and protic ionic liquids (PILs). Nine of the 19 non-aqueous molecular solvents investigated, and all four of the PILs, were found to support micelle formation. A link was investigated between the solvent cohesive energy density (as estimated using the Gordon parameter) and both the critical micelle concentration and the related free energy of micellization . In addition, the chemical structure and liquid mesostructure of the solvent were found to be important factors in the ability of the solvents to support micelle formation.
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Affiliation(s)
- Emmy C Wijaya
- School of Chemistry, Bio21 Institute, University of Melbourne, VIC 3010, Australia
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71
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Tuning of Cloud Point by the Nature of Surfactant Headgroup: Influence of Counterion and Additives. J SURFACTANTS DETERG 2016. [DOI: 10.1007/s11743-016-1860-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Wang L, Xu L, Li G, Feng L, Dong S, Hao J. Compaction of DNA using C12EO4 cooperated with Fe(3.). Colloids Surf B Biointerfaces 2016; 144:355-365. [PMID: 27110911 DOI: 10.1016/j.colsurfb.2016.04.030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2015] [Revised: 04/10/2016] [Accepted: 04/14/2016] [Indexed: 12/11/2022]
Abstract
Nonionic surfactant, tetraethylene glycol monododecyl ether (C12EO4), cannot compact DNA because of its low efficiency in neutralizing the negative charges of the phosphate groups of DNA. It is also well-known that nonionic surfactants as a decompaction agent can help DNA be released from cationic surfactant aggregates. Herein, with the "bridge" Fe(3+) of C12EO4, we found that C12EO4 can efficiently compact DNA molecules into globular states with a narrow size distribution, indicating that the cooperative Fe(3+) can transform C12EO4 molecules from decompaction agents to compaction ones. The mechanism of the interaction of DNA and C12EO4 by "bridge" Fe(3+) is that the Fe(3+)-C12EO4 complexes act as multivalent ions by cooperative and hydrophobic interaction. The improved colloidal-stability and endosome escape effect induced by C12EO4 would provide the potential applications of nonionic surfactant in the physiological characteristics of DNA complexes. Cell viability assay demonstrates that Fe(3+)-C12EO4 complexes possess low cytotoxicity, ensuring good biocompatibility. Another advantage of this system is that the DNA complexes can be de-compacted by glutathione in cell without any other agents. This suggests the metal ion-nonionic surfactant complexes as compaction agent can act as the potential delivery tool of DNA in future nonviral gene delivery systems.
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Affiliation(s)
- Ling Wang
- Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan 250100, PR China
| | - Lu Xu
- Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan 250100, PR China
| | - Guihua Li
- Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan 250100, PR China
| | - Lei Feng
- Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan 250100, PR China
| | - Shuli Dong
- Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan 250100, PR China
| | - Jingcheng Hao
- Key Laboratory of Colloid and Interface Chemistry & Key Laboratory of Special Aggregated Materials, Shandong University, Ministry of Education, Jinan 250100, PR China.
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Arkhipov VP, Bogdanova SA, Idiyatullin ZS, Lunev IV, Filippov AV. Dynamic and structural properties of oxyethylated isononylphenols. MENDELEEV COMMUNICATIONS 2016. [DOI: 10.1016/j.mencom.2016.07.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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74
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Huang H, Liao Y, Bu W, Wang W, Sun JZ. Going beyond the classical amphiphilicity paradigm: the self-assembly of completely hydrophobic polymers into free-standing sheets and hollow nanostructures in solvents of variable quality. SOFT MATTER 2016; 12:5011-5021. [PMID: 27157546 DOI: 10.1039/c6sm00259e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Self-assembly is well-known to occur in amphiphiles, and the totally hydrophobic ones are never reported to self-assemble. In this work we report for the first time that the latter can self-assemble into free-standing sheets and hollow spheres in toluene/methanol mixed solvents by modulating the solvent quality. The homopolymers studied in this work are polystyrene (PS), polyphenylacetylene (PPA), and poly(3-hexyl thiophene) (P3HT), representing polymers with different rigidity. All the three form a homogenous solution in toluene, but self-assembly occurs in the toluene/methanol mixed solvents. Micrometer sized free-standing sheets were formed for PS, PPA, and P3HT at methanol volume fractions being 43%, 50%, and 67%, respectively, and hollow spheres were observed for PPA at higher methanol fractions of 75 and 90%. Under the latter solvent conditions, PS forms solid spheres, yet ill-defined aggregates and free-standing sheets coexist in the case of P3HT. This non-solvent induced self-assembly was explained by a delicate balance of two "opposing forces": van der Waals attractive and entropic repulsive forces generated between the segments of these homopolymers within a single chain, between two chains, and among more chains in the solvents of worsened quality.
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Affiliation(s)
- Huanting Huang
- Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, State Key Laboratory of Applied Organic Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China.
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Wang D, Cao Y, Cao M, Sun Y, Wang J, Hao J. Dual-Responsive Viscoelastic Lyotropic Liquid Crystal Fluids to Control the Diffusion of Hydrophilic and Hydrophobic Molecules. Chemphyschem 2016; 17:2079-87. [DOI: 10.1002/cphc.201600066] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Dong Wang
- State Key Laboratory of Heavy Oil Processing & Centre for Bioengineering and Biotechnology; China University of Petroleum (East China); Qingdao 266580 China
| | - Yueying Cao
- State Key Laboratory of Heavy Oil Processing & Centre for Bioengineering and Biotechnology; China University of Petroleum (East China); Qingdao 266580 China
| | - Meiwen Cao
- State Key Laboratory of Heavy Oil Processing & Centre for Bioengineering and Biotechnology; China University of Petroleum (East China); Qingdao 266580 China
| | - Yawei Sun
- State Key Laboratory of Heavy Oil Processing & Centre for Bioengineering and Biotechnology; China University of Petroleum (East China); Qingdao 266580 China
| | - Jiqian Wang
- State Key Laboratory of Heavy Oil Processing & Centre for Bioengineering and Biotechnology; China University of Petroleum (East China); Qingdao 266580 China
| | - Jingcheng Hao
- Key Laboratory of Colloid and Interface Chemistry; Shandong University), Ministry of Education; Jinan 250100 China
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Liu H, Hu H, Wang J, Niehoff P, He X, Paillard E, Eder D, Winter M, Li J. Hierarchical Ternary MoO2
/MoS2
/Heteroatom-Doped Carbon Hybrid Materials for High-Performance Lithium-Ion Storage. ChemElectroChem 2016. [DOI: 10.1002/celc.201600062] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Haidong Liu
- MEET Battery Research Center; University of Muenster; Corrensstr. 46 48149 Muenster Germany
- Institute of Physical Chemistry; University of Muenster; Corrensstr. 28/30 48149 Muenster Germany
| | - Huating Hu
- Institute of Physical Chemistry; University of Muenster; Corrensstr. 28/30 48149 Muenster Germany
| | - Jun Wang
- MEET Battery Research Center; University of Muenster; Corrensstr. 46 48149 Muenster Germany
- Institute of Physical Chemistry; University of Muenster; Corrensstr. 28/30 48149 Muenster Germany
| | - Philip Niehoff
- MEET Battery Research Center; University of Muenster; Corrensstr. 46 48149 Muenster Germany
- Institute of Physical Chemistry; University of Muenster; Corrensstr. 28/30 48149 Muenster Germany
| | - Xin He
- MEET Battery Research Center; University of Muenster; Corrensstr. 46 48149 Muenster Germany
- Institute of Physical Chemistry; University of Muenster; Corrensstr. 28/30 48149 Muenster Germany
| | - Elie Paillard
- Helmholtz Institute Münster - Forschungszentrum Jülich GmbH (IEK-12); Corrensstr. 46 48149 Münster Germany
| | - Dominik Eder
- Institute of Physical Chemistry; University of Muenster; Corrensstr. 28/30 48149 Muenster Germany
| | - Martin Winter
- MEET Battery Research Center; University of Muenster; Corrensstr. 46 48149 Muenster Germany
- Institute of Physical Chemistry; University of Muenster; Corrensstr. 28/30 48149 Muenster Germany
- Helmholtz Institute Münster - Forschungszentrum Jülich GmbH (IEK-12); Corrensstr. 46 48149 Münster Germany
| | - Jie Li
- MEET Battery Research Center; University of Muenster; Corrensstr. 46 48149 Muenster Germany
- Institute of Physical Chemistry; University of Muenster; Corrensstr. 28/30 48149 Muenster Germany
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Szumała P, Mówińska A. Perfectly Wetting Mixtures of Surfactants from Renewable Resources: The Interaction and Synergistic Effects on Adsorption and Micellization. J SURFACTANTS DETERG 2016; 19:437-445. [PMID: 27182191 PMCID: PMC4839049 DOI: 10.1007/s11743-016-1793-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Accepted: 01/28/2016] [Indexed: 11/24/2022]
Abstract
This paper presents a study of the surface properties of mixtures of surfactants originating from renewable sources, i.e., alkylpolyglucoside (APG), ethoxylated fatty alcohol (AE), and sodium soap (Na soap). The main objective was to optimize the surfactant ratio which produces the highest wetting properties during the analysis of the solution of the individual surfactants, two- and three-component mixtures, and at different pH values. The results showed the existence of a synergistic effect in lowering the interfacial tension, critical micelle concentration and the formation of mixed micelles in selected solutions. We found that best wetting properties were measured for the binary AE:APG mixtures. It has been demonstrated that slightly lower contact angles values were observed on Teflon and glass surfaces for the AE:APG:soap mixtures but the results were obtained for higher concentration of the components. In addition, all studied solutions have very good surface properties in acidic, basic and neural media. However, the AE:soap (molar ratio of 1:2), AE:APG (2:1) and AE:APG:soap (1:1:1) compositions improved their wetting power at pH 7 on the aluminium and glass surfaces, as compared to solutions at other pH values tested (selected Θ values close to zero-perfectly wetting liquids). All described effects detected would allow less surfactant to be used to achieve the maximum capacity of washing, wetting or solubilizing while minimizing costs and demonstrating environmental care.
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Affiliation(s)
- Patrycja Szumała
- Department of Fats and Detergents Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
| | - Alicja Mówińska
- Department of Fats and Detergents Technology, Faculty of Chemistry, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
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78
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Achilles A, Bärenwald R, Lechner BD, Werner S, Ebert H, Tschierske C, Blume A, Bacia K, Saalwächter K. Self-Assembly of X-Shaped Bolapolyphiles in Lipid Membranes: Solid-State NMR Investigations. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:673-682. [PMID: 26735449 DOI: 10.1021/acs.langmuir.5b03712] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A novel class of rigid-rod bolapolyphilic molecules with three philicities (rigid aromatic core, mobile aliphatic side chains, polar end groups) has recently been demonstrated to incorporate into and span lipid membranes, and to exhibit a rich variety of self-organization modes, including macroscopically ordered snowflake structures with 6-fold symmetry. In order to support a structural model and to better understand the self-organization on a molecular scale, we here report on proton and carbon-13 high-resolution magic-angle spinning solid-state NMR investigations of two different bolapolyphiles (BPs) in model membranes of two different phospholipids (DPPC, DOPC). We elucidate the changes in molecular dynamics associated with three new phase transitions detected by calorimetry in composite membranes of different composition, namely, a change in π-π-packing, the melting of lipid tails associated with the superstructure, and the dissolution and onset of free rotation of the BPs. We derive dynamic order parameters associated with different H-H and C-H bond directions of the BPs, demonstrating that the aromatic cores are well packed below the final phase transition, showing only 180° flips of the phenyl ring, and that they perform free rotations with additional oscillations of the long axis when dissolved in the fluid membrane. Our data suggests that BPs not only form ordered superstructures, but also rather homogeneously dispersed π-packed filaments within the lipid gel phase, thus reducing the corrugation of large vesicles.
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Affiliation(s)
- Anja Achilles
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Ruth Bärenwald
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Bob-Dan Lechner
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Stefan Werner
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Helgard Ebert
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Carsten Tschierske
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Alfred Blume
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Kirsten Bacia
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
| | - Kay Saalwächter
- Institut für Physik - NMR, ‡Institut für Chemie - Physikalische Chemie, §ZIK HALOmem, and ∥Institut für Chemie - Organische Chemie, Martin-Luther-Universität Halle-Wittenberg , D-06120 Halle, Germany
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Indelicato S, Bongiorno D, Ceraulo L, Calabrese V, Piazzese D, Napoli A, Mazzotti F, Avellone G, Di Stefano V, Turco Liveri V. Electrospray ion mobility mass spectrometry of positively and negatively charged (1R,2S)-dodecyl(2-hydroxy-1-methyl-2-phenylethyl)dimethylammonium bromide aggregates. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2016; 30:230-238. [PMID: 26661990 DOI: 10.1002/rcm.7422] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 10/06/2015] [Accepted: 10/06/2015] [Indexed: 06/05/2023]
Abstract
RATIONALE Self-assembling processes of surfactants in the gas phase constitute a developing research field of interest since they allow information to be gained on the peculiar structural organization of these aggregates, on their ability to incorporate from small molecules up to proteins and on their possible use as carriers of drugs in the gas phase or as cleaning agents and exotic reaction media. METHODS The mass spectra of charged aggregates of the chiral surfactant (1R,2S)-dodecyl(2-hydroxy-1-methyl-2-phenylethyl)dimethylammonium bromide (DMEB) in the gas phase have been recorded using a Synapt G2-Si mass spectrometer in the positive and negative ion mode. For comparison purposes, the mass spectra of sodium bis(2-ethylhexyl)sulfosuccinate and sodium octane sulfonate aggregates have also been recorded under the same experimental conditions. The collisional cross sections of positively and negatively charged DMEB aggregates were obtained through an appropriate calibration of the measured drift times. RESULTS For all the surfactants investigated, it has been found that there is a lowest and a highest limit of the aggregation number at each charge state: no aggregates are found outside this range. Moreover, the occurrence at each aggregation number and extra charge of a unique value of drift time points toward aggregates whose conformations do not show discernible shape change in the experiment time scale. The analysis of the collisional cross sections emphasizes that the DMEB aggregates are nearly spherical clusters somewhat affected by the charge state and constituted by interlaced polar and apolar domains. CONCLUSIONS The analysis of all the experimental findings indicates that in the gas phase DMEB forms supramolecular aggregates characterized by an internal organization whose stability is triggered by the charge state. The comparison of the behavior of DMEB aggregates with that of sodium bis(2-ethylhexyl)sulfosuccinate and sodium octane sulfonate aggregates allows us to highlight the effects on the aggregate organization in gas phase due to nature of the head group and alkyl chain steric hindrance.
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Affiliation(s)
- Serena Indelicato
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
| | - David Bongiorno
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
| | - Leopoldo Ceraulo
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
| | - Valentina Calabrese
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
| | - Daniela Piazzese
- Dipartimento di Fisica e Chimica, Università degli Studi di Palermo, Viale delle Scienze, Ed. 17, I-90128, Palermo, Italy
| | - Anna Napoli
- Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, Via P. Bucci Cubo 12/C, I-87036, Arcavacata di Rende, (CS)-Italy
| | - Fabio Mazzotti
- Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, Via P. Bucci Cubo 12/C, I-87036, Arcavacata di Rende, (CS)-Italy
| | - Giuseppe Avellone
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
| | - Vita Di Stefano
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
| | - Vincenzo Turco Liveri
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
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Bongiorno D, Ceraulo L, Indelicato S, Turco Liveri V, Indelicato S. Charged supramolecular assemblies of surfactant molecules in gas phase. MASS SPECTROMETRY REVIEWS 2016; 35:170-187. [PMID: 26113001 DOI: 10.1002/mas.21476] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Indexed: 06/04/2023]
Abstract
The aim of this review is to critically analyze recent literature on charged supramolecular assemblies formed by surfactant molecules in gas phase. Apart our specific interest on this research area, the stimuli to undertake the task arise from the widespread theoretical and applicative benefits emerging from a comprehensive view of this topic. In fact, the study of the formation, stability, and physicochemical peculiarities of non-covalent assemblies of surfactant molecules in gas phase allows to unveil interesting aspects such as the role of attractive, repulsive, and steric intermolecular interactions as driving force of supramolecular organization in absence of interactions with surrounding medium and the size and charge state dependence of aggregate structural and dynamical properties. Other interesting aspects worth to be investigated are joined to the ability of these assemblies to incorporate selected solubilizates molecules as well as to give rise to chemical reactions within a single organized structure. In particular, the incorporation of large molecules such as proteins has been of recent interest with the objective to protect their structure and functionality during the transition from solution to gas phase. Exciting fall-out of the study of gas phase surfactant aggregates includes mass and energy transport in the atmosphere, origin of life and simulation of supramolecular aggregation in the interstellar space. Moreover, supramolecular assemblies of amphiphilic molecules in gas phase could find remarkable applications as atmospheric cleaning agents, nanosolvents and nanoreactors for specialized chemical processes in confined space. Mass spectrometry techniques have proven to be particularly suitable to generate these assemblies and to furnish useful information on their size, size polydispersity, stability, and structural organization. On the other hand molecular dynamics simulations have been very useful to rationalize many experimental findings and to furnish a vivid picture of the structural and dynamic features of these aggregates. Thus, in this review, we will focus on the most important achievements gained in recent years by both these investigative tools.
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Affiliation(s)
- David Bongiorno
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
- Centro Grandi Apparecchiature-UniNetLab, Università degli Studi di Palermo, Via Marini 14, I-90128, Palermo, Italy
| | - Leopoldo Ceraulo
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
- Centro Grandi Apparecchiature-UniNetLab, Università degli Studi di Palermo, Via Marini 14, I-90128, Palermo, Italy
| | - Sergio Indelicato
- Core Laboratory of Quality control and Chemical Risk, Policlinico P. Giaccone, Università di Palermo, via del Vespro 129, I-90127, Palermo, Italy
| | - Vincenzo Turco Liveri
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
| | - Serena Indelicato
- Dipartimento di Scienze e Tecnologie Biologiche Chimiche Farmaceutiche (STEBICEF), Università degli Studi di Palermo, Via Archirafi 32, I-90123, Palermo, Italy
- Centro Grandi Apparecchiature-UniNetLab, Università degli Studi di Palermo, Via Marini 14, I-90128, Palermo, Italy
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Shen J, Pang J, Xu G, Xin X, Yang Y, Luan X, Yuan S. Smart stimuli-responsive fluorescent vesicular sensor based on inclusion complexation of cyclodextrins with Tyloxapol. RSC Adv 2016. [DOI: 10.1039/c5ra26464b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Novel fluorescent vesicles based on inclusion complexes of β-cyclodextrins (β-CD) with Tyloxapol were constructed.
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Affiliation(s)
- Jinglin Shen
- Key Laboratory of Colloid and Interface Chemistry (Shandong University)
- Ministry of Education
- Jinan
- P. R. China
| | - Jinyu Pang
- Shanxi Transportation Research Institute
- Taiyuan 030006
- P. R. China
| | - Guiying Xu
- Key Laboratory of Colloid and Interface Chemistry (Shandong University)
- Ministry of Education
- Jinan
- P. R. China
- National Engineering Technology Research Center for Colloidal Materials
| | - Xia Xin
- Key Laboratory of Colloid and Interface Chemistry (Shandong University)
- Ministry of Education
- Jinan
- P. R. China
- National Engineering Technology Research Center for Colloidal Materials
| | - Yingjie Yang
- Key Laboratory of Colloid and Interface Chemistry (Shandong University)
- Ministry of Education
- Jinan
- P. R. China
| | - Xiaoyu Luan
- Key Laboratory of Colloid and Interface Chemistry (Shandong University)
- Ministry of Education
- Jinan
- P. R. China
| | - Shiling Yuan
- Key Laboratory of Colloid and Interface Chemistry (Shandong University)
- Ministry of Education
- Jinan
- P. R. China
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82
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Wang W, Li J, Yang X, Li P, Guo C, Li Q. Synthesis and properties of a branched short-alkyl polyoxyethylene ether alcohol sulfate surfactant. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.09.034] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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83
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Li G, Yang Q, Song A, Hao J. Self-assembled structural transition from vesicle phase to sponge phase and emulsifying properties in mixtures of arginine and fatty acids. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.09.071] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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84
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85
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Selivanova NM, Konov AB, Romanova KA, Gubaidullin AT, Galyametdinov YG. Lyotropic La-containing lamellar liquid crystals: phase behaviour, thermal and structural properties. SOFT MATTER 2015; 11:7809-7816. [PMID: 26314681 DOI: 10.1039/c5sm01371b] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
This paper provides the results of POM, DSC and XRPD methods characterizing the liquid crystalline behaviour, thermal properties and structural parameters of lyotropic systems based on a nonionic surfactant and lanthanum nitrate (La(3+)). The systems based on tetraethylene glycol monododecyl ether (C12EO4) and lanthanum nitrate have been demonstrated to form a lamellar phase. The concentration and temperature ranges of the existence of mesophases as well as thermodynamic parameters of phase transitions have been estimated. The structural parameters of the lamellar phase of the C12EO4/La(3+)/water systems have been determined using X-ray diffraction. The model of molecular packing in lamellar lanthanide-containing lyotropic mesophases was proposed for the observed patterns of structural parameters obtained at various water contents. NMR (1)H with a pulsed magnetic field gradient has been used to characterize molecular motions in the C12EO4/La(3+)/H2O systems with different water contents.
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Affiliation(s)
- N M Selivanova
- Physical and Colloid Chemistry Department, Kazan National Research Technological University, 68 Karl Marks Street, Kazan 420015, Russia.
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86
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Wang S, Larson RG. A Coarse-Grained Implicit Solvent Model for Poly(ethylene oxide), CnEm Surfactants, and Hydrophobically End-Capped Poly(ethylene oxide) and Its Application to Micelle Self-Assembly and Phase Behavior. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b01587] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Shihu Wang
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Ronald G. Larson
- Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109, United States
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87
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Olutaş EB, Balcı FM, Dag Ö. Strong Acid-Nonionic Surfactant Lyotropic Liquid-Crystalline Mesophases as Media for the Synthesis of Carbon Quantum Dots and Highly Proton Conducting Mesostructured Silica Thin Films and Monoliths. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:10265-10271. [PMID: 26332603 DOI: 10.1021/acs.langmuir.5b02225] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Lyotropic liquid-crystalline (LLC) materials are important in designing porous materials, and acids are as important in chemical synthesis. Combining these two important concepts will be highly beneficial to chemistry and material science. In this work, we show that a strong acid can be used as a solvent for the assembly of nonionic surfactants into various mesophases. Sulfuric acid (SA), 10-lauryl ether (C12E10), and a small amount of water form bicontinuous cubic (V1), 2D-hexagonal (H1), and micelle cubic (I1) mesophases with increasing SA/C12E10 mole ratio. A mixture of SA and C12E10 is fluidic but transforms to a highly ordered LLC mesophase by absorbing ambient water. The LLC mesophase displays high proton conductivity (1.5 to 19.0 mS/cm at room temperature) that increases with an increasing SA content up to 11 SA/C12E10 mole ratio, where the absorbed water is constant with respect to the SA amount but gradually increases from a 2.3 to 4.3 H2O/C12E10 mole ratio with increasing SA/C12E10 from 2 to 11, respectively. The mixture of SA and C12E10 slowly undergoes carbonization to produce carbon quantum dots (c-dots). The carbonization process can be controlled by simply controlling the water content of the media, and it can be almost halted by leaving the samples under ambient conditions, where the mixture slowly absorbs water to form photoluminescent c-dot-embedded mesophases. Over time the c-dots grow in size and increase in number, and the photoluminescence frequency gradually shifts to a lower frequency. The SA/C12E10 mesophase can also be used as a template to produce highly proton conducting mesostructured silica films and monoliths, as high as 19.3 mS/cm under ambient conditions. Aging the silica samples enhances the conductivity that can be even larger than for the LLC mesophase with the same amount of SA. The presence of silica has a positive effect on the proton conductivity of SA/C12E10 systems.
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Affiliation(s)
- Elif B Olutaş
- Bilkent University , Department of Chemistry, 06800 Ankara, Turkey
- Department of Chemistry, Abant İzzet Baysal University , 14280 Bolu, Turkey
| | - Fadime M Balcı
- Bilkent University , Department of Chemistry, 06800 Ankara, Turkey
| | - Ömer Dag
- Bilkent University , Department of Chemistry, 06800 Ankara, Turkey
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88
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Zhao T, Liu Y, Gao Z, Gao D, Li N, Bian Y, Dai K, Liu Z. Self-assembly and cytotoxicity study of PEG-modified ursolic acid liposomes. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2015; 53:196-203. [PMID: 26042707 DOI: 10.1016/j.msec.2015.04.022] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 04/17/2015] [Accepted: 04/21/2015] [Indexed: 01/21/2023]
Abstract
While ursolic acid (UA), one of the most broadly known triterpene compounds, has proved to be effective in cancer therapy, the applications of UA is limited due to its poor aqueous solubility and low bioavailability. The aim of our study was to prolong circulation time and enhance uptake of liposomes in tumor tissues through the modification of UA liposomes via water-soluble polyethylene glycol (PEG). In addition, this research also focuses on physicochemical properties of the liposome formulations, including encapsulation efficiency, particle morphology, size, stability, release rate in vitro and cytotoxicity test. The obtained liposomes were spherical particles with mean particle diameters around 100-200 nm. And the Fourier transform infrared spectroscopy (FTIR) indicated that PEG had been anchored successfully to the liposomes. Based on our experimental data achieved, PEG-modified UA liposomes possessed higher stability than conventional liposomes, and the release rate of UA from PEG-modified liposomes was slower when compared with those of UA solution and conventional liposomes. Meanwhile, the liposomal UA showed relatively low cytotoxic effect than UA conventional liposomes within 24h, which was consistent with their release rates.
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Affiliation(s)
- Tingting Zhao
- Chemical Key Lab of Hebei Province, Department of Biological Engineering, Yanshan University, No. 438 Hebei Street, Qinhuangdao 066004, China
| | - Yanping Liu
- Chemical Key Lab of Hebei Province, Department of Biological Engineering, Yanshan University, No. 438 Hebei Street, Qinhuangdao 066004, China
| | - Zhengrong Gao
- Department of Surgery, Beijing Ditan Hospital, Beijing, China
| | - Dawei Gao
- Chemical Key Lab of Hebei Province, Department of Biological Engineering, Yanshan University, No. 438 Hebei Street, Qinhuangdao 066004, China.
| | - Nan Li
- Chemical Key Lab of Hebei Province, Department of Biological Engineering, Yanshan University, No. 438 Hebei Street, Qinhuangdao 066004, China
| | - Yanhong Bian
- Chemical Key Lab of Hebei Province, Department of Biological Engineering, Yanshan University, No. 438 Hebei Street, Qinhuangdao 066004, China
| | - Kun Dai
- Chemical Key Lab of Hebei Province, Department of Biological Engineering, Yanshan University, No. 438 Hebei Street, Qinhuangdao 066004, China
| | - Zhiwei Liu
- Chemical Key Lab of Hebei Province, Department of Biological Engineering, Yanshan University, No. 438 Hebei Street, Qinhuangdao 066004, China
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89
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Shrestha LK, Strzelczyk KM, Shrestha RG, Ichikawa K, Aramaki K, Hill JP, Ariga K. Nonionic amphiphile nanoarchitectonics: self-assembly into micelles and lyotropic liquid crystals. NANOTECHNOLOGY 2015; 26:204002. [PMID: 25912881 DOI: 10.1088/0957-4484/26/20/204002] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Amphiphiles, molecules that possess both hydrophilic and hydrophobic moieties, are architecturally simple molecules that can spontaneously self-assemble into complex hierarchical structures from lower to higher dimensions either in the bulk phase or at an interface. Recent developments in multifunctional nanostructure design using the advanced concept of nanoarchitectonics utilize this simple process of assembly. Amphiphilic self-assemblies involving lipids or proteins mimic the structure of biological systems, thus highlighting the necessity of a fundamental physical understanding of amphiphilic self-assembly towards a realization of the complex mechanisms operating in nature. Herein, we describe self-assembled microstructures of biocompatible and biodegradable tetraglycerol lauryl ether (C12G4) nonionic surfactant in an aqueous solvent system. Temperature-composition analyses of equilibrium phases identified by using small-angle x-ray scattering (SAXS) provide strong evidence of various spontaneously self-assembled mesostructures, such as normal micelles (Wm), hexagonal liquid crystal (H1), and reverse micelles (Om). In contrast to conventional poly(oxyethylene) nonionic surfactants, C12G4 did not exhibit the clouding phenomenon at higher temperatures (phase separation was not observed up to 100 °C), demonstrating the greater thermal stability of the self-assembled mesophases. Generalized indirect Fourier transformation (GIFT) evaluation of the SAXS data confirmed the formation of core-shell-type spherical micelles with a maximum dimension ca. 8.7 nm. The shape and size of the C12G4 micelles remained apparently unchanged over a wide range of concentrations (up to 20%), but intermicellar interactions increased and could be described by the Percus-Yevick (PY) theory (after Carnahan and Starling), which provides a very accurate analytical expression for the osmotic pressure of a monodisperse hard sphere.
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Affiliation(s)
- Lok Kumar Shrestha
- International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
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90
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Tardani F, Mesa CL. Titration of DNA/Carbon Nanotube Complexes with Double-Chained Oppositely Charged Surfactants. NANOMATERIALS (BASEL, SWITZERLAND) 2015; 5:722-736. [PMID: 28347031 PMCID: PMC5312900 DOI: 10.3390/nano5020722] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Revised: 03/26/2015] [Accepted: 04/10/2015] [Indexed: 11/16/2022]
Abstract
1/1 dispersions of ss-DNA/CNT complexes in mass ratios were investigated in a mixture with didodecyldimethylammonium bromide, DDAB. Depending on the amounts of the surface-active agent and of the complexes, solutions, precipitates, or re-dissolution occur. DDAB titrates the phosphate groups on the outer surface of the complex and controls the phase sequence in these systems. The combination of different experimental methods determined the phases that occur therein. The results are based on optical absorbance, Dynamic Light Scattering, ionic conductivity, ζ-potential, optical microscopy and AFM. From the above findings a (pseudo)-binary phase diagram is attained. The system has strong similarities with polymer-surfactant mixtures. In fact, its properties conform to cases in which interactions between rigid rod-like polyelectrolytes and oppositely charged species take place. The peculiarities of double-chained DDAB in the process imply significant differences with respect to the behavior of single chain surfactants. In fact, DDAB associates into vesicular entities, when the homologous single chain species forms small micellar aggregates.
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Affiliation(s)
- Franco Tardani
- Department of Chemistry, La Sapienza University, P.le A. Moro 5, 00185 Rome, Italy.
| | - Camillo La Mesa
- Department of Chemistry, La Sapienza University, P.le A. Moro 5, 00185 Rome, Italy.
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91
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Ogawa S, Asakura K, Osanai S. Lyotropic behavior of a mono-tailed glycolipid assembly during solidification and melting of electrolyte/ice eutectic systems. Chem Pharm Bull (Tokyo) 2014; 62:1180-4. [PMID: 25450626 DOI: 10.1248/cpb.c14-00425] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The properties of low molecular weight glycolipids at subzero temperatures have been paid much attention due to their great potential for applications in cryopreservation. In this study, the ability of glycolipids to maintain their lyotropic properties was investigated by analyzing the aggregation behavior of octyl-β-D-glucoside (β-OGlu) during solidification and melting of electrolyte/ice eutectic mixtures using a simultaneous X-ray diffraction-differential scanning calorimetry measurement and cryomicroscopic observation. During the freezing process, eutectic formation increased the concentration of the β-OGlu micelle solution in the unfrozen phase, leading to ordering of the molecular assembly. The molecular assembly exhibited a reversible phase transformation between liquid crystalline phases (e.g., lamellar (Lα) and hexagonal (H) phases) and an isotropic micelle solution (I), depending on the degree of eutectic formation, which was regulated by temperature. Because the coexistence of electrolyte/ice eutectic often induces the dehydration of lipids, the persistence of lyotropic properties under such arid conditions demonstrates an attractive performance of glycolipids for use in low temperature applications, such as the cryopreservation of poorly water-soluble drugs or proteins.
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Affiliation(s)
- Shigesaburo Ogawa
- Department of Applied Chemistry, Graduate School of Science and Technology, Keio University
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92
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Tunkara E, Albayrak C, Polat EO, Kocabas C, Dag Ö. Highly proton conductive phosphoric acid-nonionic surfactant lyotropic liquid crystalline mesophases and application in graphene optical modulators. ACS NANO 2014; 8:11007-11012. [PMID: 25317477 DOI: 10.1021/nn505199q] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Proton conducting gel electrolytes are very important components of clean energy devices. Phosphoric acid (PA, H(3)PO(4) · H2O) is one of the best proton conductors, but needs to be incorporated into some matrix for real device applications, such as into lyotropic liquid crystalline mesophases (LLCMs). Herein, we show that PA and nonionic surfactant (NS, C(12)H(25)(OCH(2)CH(2))(10)OH, C(12)E(10)) molecules self-assemble into PANS-LLCMs and display high proton conductivity. The content of the PANS-LLCM can be as high 75% H(3)PO(4) · H2O and 25% 10-lauryl ether (C(12)H(25)(OCH(2)CH(2))(10)OH, C(12)E(10)), and the mesophase follows the usual LLC trend, bicontinuous cubic (V1)-normal hexagonal (H1)-micelle cubic (I1), by increasing the PA concentration in the media. The PANS-LLCMs are stable under ambient conditions, as well as at high (up to 130 °C) and low (-100 °C) temperatures with a high proton conductivity, in the range of 10(-2) to 10(-6) S/cm. The mesophase becomes a mesostructured solid with decent proton conductivity below -100 °C. The mesophase can be used in many applications as a proton-conducting media as well as a phosphate source for the synthesis of various metal phosphates. As an application, we demonstrate a graphene-based optical modulator using supercapacitor structure formed by graphene electrodes and a PANS electrolyte. A PANS-LLC electrolyte-based supercapacitor enables efficient optical modulation of graphene electrodes over a range of wavelengths, from 500 nm to 2 μm, under ambient conditions.
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Affiliation(s)
- Ebrima Tunkara
- Department of Chemistry and ‡Department of Physics, Bilkent University , 06800, Ankara, Turkey
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93
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Liao Y, Liu N, Zhang Q, Bu W. Self-Assembly of Polyoxometalate-Based Starlike Polymers in Solvents of Variable Quality: From Free-Standing Sheet to Vesicle. Macromolecules 2014. [DOI: 10.1021/ma501343s] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Yin Liao
- Key Laboratory of Nonferrous Metals Chemistry and Resources
Utilization of Gansu Province, State Key Laboratory of Applied Organic
Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China
| | - Nijuan Liu
- Key Laboratory of Nonferrous Metals Chemistry and Resources
Utilization of Gansu Province, State Key Laboratory of Applied Organic
Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China
| | - Qian Zhang
- Key Laboratory of Nonferrous Metals Chemistry and Resources
Utilization of Gansu Province, State Key Laboratory of Applied Organic
Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China
| | - Weifeng Bu
- Key Laboratory of Nonferrous Metals Chemistry and Resources
Utilization of Gansu Province, State Key Laboratory of Applied Organic
Chemistry, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China
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94
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Chiappisi L, Prévost S, Grillo I, Gradzielski M. From crab shells to smart systems: chitosan-alkylethoxy carboxylate complexes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:10608-10616. [PMID: 25115198 DOI: 10.1021/la502569p] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
In this work, self-assembly of alkyl ethylene oxide carboxylates and the biopolymer chitosan into supramolecular structures with various shapes is presented. Our investigations were done at pH 4.0, where the chitosan is almost fully charged and the surfactants are partially deprotonated. By changing the alkyl chain length and the number of ethylenoxide units very different water-soluble complexes can be obtained, ranging from globular micelles incorporated in a chitosan network to formation of ordered multiwalled vesicles. The structural characteristics of these complexes can be finely controlled by the mixing ratio of chitosan and surfactant, i.e., simply by the solutions composition. For instance, the vesicle wall thickness can be varied between 5 and 50 nm just by varying the mixing ratio. Accordingly, we expect this system to be an outstanding carrier for hydrophilic compounds with tunable release time option. Moreover, an easy route for preparation of chitosan-based complexes in the solid state with controlled mesoscopic order is presented. This work opens the way to prepare biofriendly materials on the basis of chitosan and mild anionic surfactants which are rather versatile with respect to their structure and properties, allowing for preparation of complexes with highly variable structures in both aqueous and solid phase. Formation of such different structures can be exploited for preparation of carriers, which are able to transport hydrophilic as well as hydrophobic molecules. Furthermore, as chitosan is well known to exhibit antibacterial and anti-inflammatory properties, different applications of these complexes can be indicated, i.e., as drug delivery systems or as coatings for medical implants.
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Affiliation(s)
- Leonardo Chiappisi
- Stranski Laboratorium für Physikalische Chemie und Theoretische Chemie, Institut für Chemie, Technische Universität Berlin , Straße des 17, Juni 124, Sekretariat TC 7, D-10623 Berlin, Germany
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95
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Sun N, Shi L, Lu F, Xie S, Zheng L. Spontaneous vesicle phase formation by pseudogemini surfactants in aqueous solutions. SOFT MATTER 2014; 10:5463-5471. [PMID: 24946095 DOI: 10.1039/c4sm00565a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The phase behavior of a kind of pseudogemini surfactant in aqueous solutions, formed by the mixture of sodium dodecyl benzene sulfonate (SDBS) and butane-1,4-bis (methylimidazolium bromide) ([mim-C4-mim]Br2) or butane-1,4-bis(methylpyrrolidinium bromide) ([mpy-C4-mpy]Br2) in a molar ratio of 2 : 1, is reported in the present work. When [mim-C4-mim]Br2 or [mpy-C4-mpy]Br2 is mixed with SDBS in aqueous solutions, one cationic [mim-C4-mim]Br2 or [mpy-C4-mpy]Br2 molecule "bridges" two SDBS molecules by noncovalent interactions (e.g. electrostatic, π-π stacking, and σ-π interactions), behaving like a pseudogemini surfactant. Vesicles can be formed by this kind of pseudogemini surfactant, determined by freeze-fracture transmission electron microscopy (FF-TEM) or cryogenic-transmission electron microscopy (cryo-TEM) and dynamic light scattering (DLS). The mixed system of sodium dodecyl sulfate (SDS) with [mim-C4-mim]Br2 or [mpy-C4-mpy]Br2 was also constructed, and only micelles were observed. We infer that a pseudogemini surfactant is formed under the synergic effect of electrostatic, π-π stacking, and σ-π interactions in the SDBS/[mim-C4-mim]Br2/H2O system, while electrostatic attraction and hydrophobic interactions may provide the directional force for vesicle formation in the SDBS/[mpy-C4-mpy]Br2/H2O system.
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Affiliation(s)
- Nan Sun
- Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, China.
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96
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Albayrak C, Barım G, Dag Ö. Effect of hygroscopicity of the metal salt on the formation and air stability of lyotropic liquid crystalline mesophases in hydrated salt-surfactant systems. J Colloid Interface Sci 2014; 433:26-33. [PMID: 25112909 DOI: 10.1016/j.jcis.2014.07.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 07/04/2014] [Accepted: 07/07/2014] [Indexed: 10/25/2022]
Abstract
It is known that alkali, transition metal and lanthanide salts can form lyotropic liquid crystalline (LLC) mesophases with non-ionic surfactants (such as CiH2i+1(OCH2CH2)jOH, denoted as CiEj). Here we combine several salt systems and show that the percent deliquescence relative humidity (%DRH) value of a salt is the determining parameter in the formation and stability of the mesophases and that the other parameters are secondary and less significant. Accordingly, salts can be divided into 3 categories: Type I salts (such as LiCl, LiBr, LiI, LiNO3, LiClO4, CaCl2, Ca(NO3)2, MgCl2, and some transition metal nitrates) have low %DRH and form stable salt-surfactant LLC mesophases in the presence of a small amount of water, type II salts (such as some sodium and potassium salts) that are moderately hygroscopic form disordered stable mesophases, and type III salts that have high %DRH values, do not form stable LLC mesophases and leach out salt crystals. To illustrate this effect, a large group of salts from alkali and alkaline earth metals were investigated using XRD, POM, FTIR, and Raman techniques. Among the different salts investigated in this study, the LiX (where X is Cl(-), Br(-), I(-), NO3(-), and ClO4(-)) and CaX2 (X is Cl(-), and NO3(-)) salts were more prone to establish LLC mesophases because of their lower %DRH values. The phase behavior with respect to concentration, stability, and thermal behavior of Li(I) systems were investigated further. It is seen that the phase transitions among different anions in the Li(I) systems follow the Hofmeister series.
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Affiliation(s)
- Cemal Albayrak
- Bilkent University, Department of Chemistry, 06800 Ankara, Turkey
| | - Gözde Barım
- Bilkent University, Department of Chemistry, 06800 Ankara, Turkey
| | - Ömer Dag
- Bilkent University, Department of Chemistry, 06800 Ankara, Turkey.
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97
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Self-assembly: from amphiphiles to chromophores and beyond. Molecules 2014; 19:8589-609. [PMID: 24959684 PMCID: PMC6271149 DOI: 10.3390/molecules19068589] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 06/17/2014] [Accepted: 06/17/2014] [Indexed: 11/17/2022] Open
Abstract
Self-assembly has been recognised as a ubiquitous aspect of modern chemistry. Our understanding and applications of self-assembly are substantially based on what has been learned from biochemical systems. In this review, we describe various aspects of self-assembly commencing with an account of the soft structures that are available by assembly of surfactant amphiphiles, which are important scientific and industrial materials. Variation of molecular design using rules defined by surfactant self-assembly permits synthesis of functional nanostructures in solution and at surfaces while increasing the strength of intermolecular interactions through π-π stacking, metal cation coordination and/or hydrogen bonding leads to formation of highly complex bespoke nanostructured materials exemplified by DNA assemblies. We describe the origins of self-assembly involving aggregation of lipid amphiphiles and how this subject has been expanded to include other highly advanced chemical systems.
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98
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Barım G, Albayrak C, Yılmaz E, Dag Ö. Highly conducting lyotropic liquid crystalline mesophases of pluronics (P65, P85, P103, and P123) and hydrated lithium salts (LiCl and LiNO₃). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:6938-6945. [PMID: 24874818 DOI: 10.1021/la5006105] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Demand for ionically conducting materials, as membranes and electrodes, is one of the driving forces of current research in chemistry, physics, and engineering. The lithium ion is a key element of these materials, and its assembly into nanostructures and mesophases is important for the membrane and electrode technologies. In this investigation, we show that hydrated lithium salts (such as LiCl·xH2O and LiNO3·xH2O, x is as low as 1.5 and 3.0, respectively) and pluronics (triblock copolymer such as PX where X is 65, 85, 103, and 123) form lyotropic liquid crystalline mesophases (LLCM), denoted as LiY·xH2O-PX-n (Y is Cl(-) or NO3(-), and n is the salt/PX mole ratio). The structure of the mesophase is hexagonal over a broad salt concentration and transforms to a cubic mesophase and then to disordered gel phase with an increasing salt content of the mixtures. The mesophases are unstable at low salt contents and undergo a phase separation into pure pluronics and salt-rich LLCMs. The salt content of the ordered mesophase can be as high as 30 mole ratio for each pluronic, which is a record high for any known salted phases. The mesophases also display high ac ionic conductivities, reaching up to 21 mS/cm at room temperature (RT), and are sensitive to the water content. These mesophases can be useful as ion-conducting membranes and can be used as media for the synthesis of lithium-containing nanoporous materials.
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Affiliation(s)
- Gözde Barım
- Department of Chemistry, Bilkent University , 06800 Ankara, Turkey
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Mohd-Setapar SH, Mohamad-Aziz SN, Chuong CS, Che Yunus MA, Ahmad Zaini MA, Kamaruddin MJ. A REVIEW OF MIXED REVERSE MICELLE SYSTEM FOR ANTIBIOTIC RECOVERY. CHEM ENG COMMUN 2014. [DOI: 10.1080/00986445.2013.819799] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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The possible phase diagrams for the transverse Ising model with temperature-dependent parameters. Chem Phys Lett 2014. [DOI: 10.1016/j.cplett.2014.05.024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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