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Jennings J, Webster-Aikman RR, Ward-O’Brien N, Xie A, Beattie DL, Deane OJ, Armes SP, Ryan AJ. Hydrocarbon-Based Statistical Copolymers Outperform Block Copolymers for Stabilization of Ethanol-Water Foams. ACS APPLIED MATERIALS & INTERFACES 2022; 14:39548-39559. [PMID: 35984897 PMCID: PMC9437873 DOI: 10.1021/acsami.2c09910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 08/05/2022] [Indexed: 06/15/2023]
Abstract
Well-defined block copolymers have been widely used as emulsifiers, stabilizers, and dispersants in the chemical industry for at least 50 years. In contrast, nature employs amphiphilic proteins as polymeric surfactants whereby the spatial distribution of hydrophilic and hydrophobic amino acids within the polypeptide chains is optimized for surface activity. Herein, we report that polydisperse statistical copolymers prepared by conventional free-radical copolymerization can provide superior foaming performance compared to the analogous diblock copolymers. A series of predominantly (meth)acrylic comonomers are screened to identify optimal surface activity for foam stabilization of aqueous ethanol solutions. In particular, all-acrylic statistical copolymers comprising trimethylhexyl acrylate and poly(ethylene glycol) acrylate, P(TMHA-stat-PEGA), confer strong foamability and also lower the surface tension of a range of ethanol-water mixtures to a greater extent than the analogous block copolymers. For ethanol-rich hand sanitizer formulations, foam stabilization is normally achieved using environmentally persistent silicone-based copolymers or fluorinated surfactants. Herein, the best-performing fully hydrocarbon-based copolymer surfactants effectively stabilize ethanol-rich foams by a mechanism that resembles that of naturally-occurring proteins. This ability to reduce the surface tension of low-surface-energy liquids suggests a wide range of potential commercial applications.
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2
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Li R, Qian F, Ren X. Amphiphilic Copolymers PDMAEMA
m
‐
b
‐PAA
n
and Their Complexes with Surfactants at the Air/Water Interface. J SURFACTANTS DETERG 2019. [DOI: 10.1002/jsde.12317] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Rong Li
- Key Laboratory of Eco‐textiles of Ministry of Education, College of Textiles and ClothingJiangnan University Wuxi Jiangsu 214122 China
| | - Fengyi Qian
- Key Laboratory of Eco‐textiles of Ministry of Education, College of Textiles and ClothingJiangnan University Wuxi Jiangsu 214122 China
| | - Xuehong Ren
- Key Laboratory of Eco‐textiles of Ministry of Education, College of Textiles and ClothingJiangnan University Wuxi Jiangsu 214122 China
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3
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Kim HC, Arick DQ, Won YY. Air-Water Interfacial Properties of Chloroform-Spread versus Water-Spread Poly((d,l-lactic acid- co-glycolic acid)- block-ethylene glycol) (PLGA-PEG) Polymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:4874-4887. [PMID: 29602280 DOI: 10.1021/acs.langmuir.8b00566] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Polymers at fluid interfaces are used for a number of applications that include coatings, electronics, separation, energy, cosmetics, and medicines. Here, we present a study on an amphiphilic block copolymer, poly((d,l-lactic acid- co-glycolic acid)- block-ethylene glycol) (PLGA-PEG), at the air-water interface. PLGA-PEG at the air-water interface prepared by using an organic spreading solvent exhibits an extremely high surface pressure without the occurrence of desorption, making it an attractive candidate for a variety of uses in the areas mentioned above. The origin of this high surface pressure increase was shown to be due to the glass transition of the PLGA segments. The temperature at which this glass transition occurs for the PLGA segments of PLGA-PEG at the air-water interface was measured to be about 290 K by thermodynamic analysis based on the two-dimensional Maxwell relations. However, from an applications standpoint, spreading by an organic solvent greatly limits its scope of feasible uses. To explore the possibility of maintaining the excellent surface mechanical properties of the PLGA-PEG at the air-water interface while not using an organic solvent, we investigated the air-water interfacial properties of water-spread PLGA-PEG. When spread with water, it was shown that the initial micelles that form in the aqueous spreading solution remain intact even after being spread onto the air-water interface. Due to this different morphology, the surface pressure and monolayer stability were greatly reduced for the water-spread PLGA-PEG at the air-water interface. We used the Daoud and Cotton's blob scaling model to describe the desorption process of the water-spread PLGA-PEG at the air-water interface. From the scaling concept, it was shown that with higher PEG molecular weight and larger micelle size, the adsorption energy of the water-spread PLGA-PEG to the air-water interface was increased.
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Affiliation(s)
- Hyun Chang Kim
- School of Chemical Engineering , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Davis Q Arick
- School of Chemical Engineering , Purdue University , West Lafayette , Indiana 47907 , United States
| | - You-Yeon Won
- School of Chemical Engineering , Purdue University , West Lafayette , Indiana 47907 , United States
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4
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Fundamental properties, self-assembling behavior, and their temperature and salt responsivity of ionic amphiphilic diblock copolymer having poly(N-isopropylacrylamide) in aqueous solution. Colloid Polym Sci 2017. [DOI: 10.1007/s00396-017-4217-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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5
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Zhao X, Wang Q, Yu X, Lee YIII, Liu HG. Hierarchical composite microstructures fabricated at the air/liquid interface through multilevel self-assembly of block copolymers. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2016.12.033] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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6
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Zhao X, Zhang X, Liu HG. Composite PS-b-P4VP/Ag and PS-b-P4VP/Au thin films fabricated via a multilevel self-assembly process. RSC Adv 2016. [DOI: 10.1039/c6ra12435f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Thin composite films with microstructures doped with Ag or Au species were fabricated at the air/liquid interface, which exhibited effective catalytic activities for heterogeneous catalytic reactions.
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Affiliation(s)
- Xingjuan Zhao
- Key Laboratory for Colloid and Interface Chemistry of Education Ministry
- Shandong University
- Jinan 250100
- P. R. China
| | - Xiaokai Zhang
- College of Physics and Electronics
- Shandong Normal University
- Jinan 250014
- P. R. China
| | - Hong-Guo Liu
- Key Laboratory for Colloid and Interface Chemistry of Education Ministry
- Shandong University
- Jinan 250100
- P. R. China
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7
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Raffa P, Wever DAZ, Picchioni F, Broekhuis AA. Polymeric Surfactants: Synthesis, Properties, and Links to Applications. Chem Rev 2015; 115:8504-63. [PMID: 26182291 DOI: 10.1021/cr500129h] [Citation(s) in RCA: 184] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Patrizio Raffa
- Department of Chemical Engineering-Product Technology, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands.,Dutch Polymer Institute DPI , P.O. Box 902, 5600 AX Eindhoven, The Netherlands
| | - Diego Armando Zakarias Wever
- Department of Chemical Engineering-Product Technology, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands.,Dutch Polymer Institute DPI , P.O. Box 902, 5600 AX Eindhoven, The Netherlands
| | - Francesco Picchioni
- Department of Chemical Engineering-Product Technology, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands
| | - Antonius A Broekhuis
- Department of Chemical Engineering-Product Technology, University of Groningen , Nijenborgh 4, 9747 AG Groningen, The Netherlands
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Murugaboopathy S, Matsuoka H. Salt-dependent surface activity and micellization behaviour of zwitterionic amphiphilic diblock copolymers having carboxybetaine. Colloid Polym Sci 2015. [DOI: 10.1007/s00396-015-3503-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Growney DJ, Mykhaylyk OO, Armes SP. Micellization and adsorption behavior of a near-monodisperse polystyrene-based diblock copolymer in nonpolar media. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:6047-6056. [PMID: 24818878 DOI: 10.1021/la501084a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The micellar self-assembly behavior of a near-monodisperse polystyrene-hydrogenated polyisoprene (PS-PEP) diblock copolymer is examined in non-polar media (either n-heptane or n-dodecane). Direct dissolution of this diblock copolymer leads to the formation of relatively large polydisperse colloidal aggregates that are kinetically frozen artifacts of the solid-state copolymer morphology. Dynamic light scattering (DLS) and transmission electron microscopy studies indicate that heating such copolymer dispersions up to 90-110 °C leads to a structural rearrangement, with the generation of relatively small, well-defined spherical micelles that persist on cooling to 20 °C. Variable temperature (1)H NMR studies using deuterated n-alkanes confirm that partial solvation (plasticization) of the polystyrene micelle cores occurs on heating. This increased mobility of the core-forming polystyrene chains is consistent with the evolution from a kinetically-trapped to a thermodynamically-favored copolymer morphology via exchange of individual copolymer chains, which are observed by DLS. These micellar self-assembly observations are also consistent with small-angle X-ray scattering (SAXS) studies, which indicate the formation of star-like micelles in n-heptane, with a mean polystyrene core diameter of about 20 nm and an overall diameter (core plus corona) of about 80 nm. Micelle dissociation occurs on addition of chloroform, which is a good solvent for both blocks. Finally, physical adsorption of this PS-PEP diblock copolymer onto a model colloidal substrate (carbon black) has been confirmed using X-ray photoelectron spectroscopy. A Langmuir-type adsorption isotherm has been constructed using a supernatant depletion assay based on UV spectroscopy analysis of the aromatic chromophore in the polystyrene block. Comparable results were obtained using thermogravimetric analysis to directly determine the amount of adsorbed copolymer. Based on the maximum adsorbed amounts observed at 20 °C, these studies strongly suggest that individual PS-PEP copolymer chains adsorb onto carbon black from chloroform, whereas micellar adsorption occurs from n-alkanes.
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Affiliation(s)
- David J Growney
- Department of Chemistry, University of Sheffield , Brook Hill, Sheffield, South Yorkshire S3 7HF, U.K
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10
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Ghosh A, Yusa SI, Matsuoka H, Saruwatari Y. Chain length dependence of non-surface activity and micellization behavior of cationic amphiphilic diblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2014; 30:3319-3328. [PMID: 24611761 DOI: 10.1021/la403042p] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The cationic and anionic amphiphilic diblock copolymers with a critical chain length and block ratio do not adsorb at the air/water interface but form micelles in solution, which is a phenomenon called "non-surface activity". This is primarily due to the high charge density of the block copolymer, which creates a strong image charge effect at the air/water interface preventing adsorption. Very stable micelle formation in bulk solution could also play an important role in the non-surface activity. To further confirm these unique properties, we studied the adsorption and micellization behavior of cationic amphiphilic diblock copolymers of poly(n-butyl acrylate)-b-poly(3-(methacryloyloxy)ethyl)trimethylammonium chloride) (PBA-b-PDMC) with different molecular weights of hydrophobic blocks but with the same ionic block length. These block copolymers were successfully prepared via consecutive reversible addition-fragmentation chain transfer (RAFT) polymerization. The block copolymer with the shortest hydrophobic block length was surface-active; the solution showed surface tension reduction and foam formation. However, above the critical block ratio, the surface tension of the solution did not decrease with increasing polymer concentration, and there was no foam formation, indicating lack of surface activity. After addition of 0.1 M NaCl, stable foam formation and slight reduction of surface tension were observed, which is reminiscent of the electrostatic nature of the non-surface activity. Fluorescence and dynamic and static light scattering measurements showed that the copolymer with the shortest hydrophobic block did not form micelles, while the block copolymers formed spherical micelles having radii of 25-30 nm. These observations indicate that micelle formation is also important for non-surface activity. Upon addition of NaCl, cmc did not decrease but rather increased as observed for non-surface-active block copolymers previously studied. The micelles formed were very stable, and their size decreased by only ∼5 nm after addition of 0.1 M NaCl.
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Affiliation(s)
- Arjun Ghosh
- Department of Polymer Chemistry, Kyoto University , Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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11
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Xu W, Choi I, Plamper FA, Synatschke CV, Müller AHE, Melnichenko YB, Tsukruk VV. Thermo-Induced Limited Aggregation of Responsive Star Polyelectrolytes. Macromolecules 2014. [DOI: 10.1021/ma500153w] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Weinan Xu
- School
of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Ikjun Choi
- School
of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
| | - Felix A. Plamper
- Institute
of Physical Chemistry, RWTH Aachen University, 52056 Aachen, Germany
| | - Christopher V. Synatschke
- Makromolekulare
Chemie II and Bayreuther Zentrum für Kolloide und Grenzflächen, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - Axel H. E. Müller
- Makromolekulare
Chemie II and Bayreuther Zentrum für Kolloide und Grenzflächen, Universität Bayreuth, D-95440 Bayreuth, Germany
| | - Yuri B. Melnichenko
- Biology
and Soft Matter Science Division, Neutron Scattering Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37381, United States
| | - Vladimir V. Tsukruk
- School
of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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12
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Matsuoka H, Onishi T, Ghosh A. pH-responsive non-surface-active/surface-active transition of weakly ionic amphiphilic diblock copolymers. Colloid Polym Sci 2013. [DOI: 10.1007/s00396-013-3125-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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13
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Matsuoka H, Hachisuka M, Uda K, Onishi T, Ozoe S. Why Ionic Amphiphilic “Block” Copolymer Can Be Non-surface Active? Comparison of Homopolymer, Block and Random Copolymers of Poly(styrenesulfonate). CHEM LETT 2012. [DOI: 10.1246/cl.2012.1063] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | | | - Kyohei Uda
- Department of Polymer Chemistry, Kyoto University
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14
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Structure investigation of poly((2-dimethylamino)ethyl methacrylate)/sodium dodecylsulfate complexes in concentrated poly((2-dimethylamino)ethyl methacrylate) solutions using small angle neutron scattering. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.04.052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Ghosh A, Yusa SI, Matsuoka H, Saruwatari Y. Non-surface activity and micellization behavior of cationic amphiphilic block copolymer synthesized by reversible addition-fragmentation chain transfer process. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:9237-9244. [PMID: 21667918 DOI: 10.1021/la201550a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Cationic amphiphilic diblock copolymers of poly(n-butylacrylate)-b-poly(3-(methacryloylamino)propyl)trimethylammonium chloride) (PBA-b-PMAPTAC) with various hydrophobic and hydrophilic chain lengths were synthesized by a reversible addition-fragmentation chain transfer (RAFT) process. Their molecular characteristics such as surface activity/nonactivity were investigated by surface tension measurements and foam formation observation. Their micelle formation behavior and micelle structure were investigated by fluorescence probe technique, static and dynamic light scattering (SLS and DLS), etc., as a function of hydrophilic and hydrophobic chain lengths. The block copolymers were found to be non-surface active because the surface tension of the aqueous solutions did not change with increasing polymer concentration. Critical micelle concentration (cmc) of the polymers could be determined by fluorescence and SLS measurements, which means that these polymers form micelles in bulk solution, although they were non-surface active. Above the cmc, the large blue shift of the emission maximum of N-phenyl-1-naphthylamine (NPN) probe and the low micropolarity value of the pyrene probe in polymer solution indicate the core of the micelle is nonpolar in nature. Also, the high value of the relative intensity of the NPN probe and the fluorescence anisotropy of the 1,6-diphenyl-1,3,5-hexatriene (DPH) probe indicated that the core of the micelle is highly viscous in nature. DLS was used to measure the average hydrodynamic radii and size distribution of the copolymer micelles. The copolymer with the longest PBA block had the poorest water solubility and consequently formed micelles with larger size while having a lower cmc. The "non-surface activity" was confirmed for cationic amphiphilic diblock copolymers in addition to anionic ones studied previously, indicating the universality of non-surface activity nature.
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Affiliation(s)
- Arjun Ghosh
- Department of Polymer Chemistry, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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16
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Lee W, Kofinas P, Briber R. Small angle neutron scattering study of deuterated sodium dodecylsulfate micellization in dilute poly((2–dimethylamino)ethyl methacrylate) solutions. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.04.018] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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17
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Theodoly O, Jacquin M, Muller P, Chhun S. Adsorption kinetics of amphiphilic diblock copolymers: from kinetically frozen colloids to macrosurfactants. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:781-793. [PMID: 19177645 DOI: 10.1021/la8030254] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
We investigated the spontaneous adsorption properties of charged amphiphilic diblock copolymers on hydrophobic surfaces and explained the transition of behavior from depleting frozen colloids (that do not adsorb at all) to fast adsorbing macrosurfactants when the hydrophobicity of the nonsoluble block is reduced. Three copolymer families have been used with the same hydrophilic block poly(acrylic acid), a weak acid whose ionization alpha can be varied by changing the pH. The hydrophobic blocks polystyrene, PS, poly(n-butyl acrylate), PBA, and poly(diethylene glycol ethyl ether acrylate), PDEGA, have interfacial tensions with water gammacore/solvent, respectively, of 32, 20, and 3 mN/m. We were mainly interested in the regime of high ionization alpha > 0.3, where PAA chains have no affinity for hydrophobic surfaces, and we verified experimentally that micelles do not adsorb directly. With the three copolymer families we show that the adsorption kinetics at an early stage is driven by the self-assembly properties in bulk solution: adsorption is hampered for PS-b-PAA (physically/kinetically frozen micelles in solution), controlled by unimer extraction for PBA-b-PAA (nonequilibrium micelles in solution with very low CMC < 10-4 wt %), and controlled by unimer diffusion and electrostatic repulsion for PDEGA-b-PAA (micelles at equilibrium in solution with high CMC is approximately 1-5 wt %). This explains the power law dependences of adsorption with concentration as C-1 for PBA-b-PAA and C-2 for PDEGA-b-PAA. It is finally the interfacial tension with water of the nonsoluble block and not its glass transition that is the main control of bulk solution self-assembly and consequently of the adsorption kinetics properties of amphiphilic diblocks. We also proved by preparative GPC that the fraction of non-self-assembling diblock chains, which exists in all highly hydrophobic amphiphilic diblock systems, plays a negligible role in the adsorption properties. Finally, we investigated the intrinsic thermodynamic affinity between amphiphilic diblocks and hydrophobic surfaces. We show quantitatively that this affinity depends dominantly on the interfacial energies between the hydrophobic block, the surface, and water: diblocks with strongly hydrophobic nonsoluble blocks (PS, PBA) have a low affinity for weakly hydrophobic surfaces, and oppositely, diblocks with weakly hydrophobic nonsoluble block (PDEGA) have a universal affinity for hydrophobic surfaces (like small-molecule surfactants but for different physical reasons). Finally, we showed via surface rheology that when adsorption occurs anchoring is strong and irreversible for very hydrophobic diblocks (PBA-b-PAA) and weaker and (partially) reversible for less hydrophobic diblocks (PDEGA-b-PAA).
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Affiliation(s)
- O Theodoly
- Complex Fluids Laboratory, CNRS FRE 3084, France.
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18
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Liu L, Kim JK, Gunawidjaja R, Tsukruk VV, Lee M. Toroid morphology by ABC-type amphiphilic rod-coil molecules at the air-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:12340-12346. [PMID: 18837526 DOI: 10.1021/la8023106] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The interfacial and aggregation behavior of the ABC-type amphiphilic molecules with semirigid dumbbell-shaped core and variable length of hydrophobic branched tails (R=(CH2)nCH3 with n=5 (1), 9 (2), 13 (3)) were investigated. At low surface pressure, smooth, uniform monolayers were formed at the air-water interface by molecules 1 and 2, whereas for molecule 3 unique 2D toroid aggregates have been formed. These aggregates were relatively stable within a range of surface pressure and spreading solution concentration. Upon compression, the 2D toroid aggregates collapsed into large, round 3D aggregates. Finally, the choice of spreading solvent has a great influence on aggregation formation into 2D or 3D micelles as a result of the variable balance of the hydrophobic interactions of branched tails and the pi-pi stacking interaction between aromatic segments.
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Affiliation(s)
- Libin Liu
- Center for Supramolecular Nano-Assembly, Department of Chemistry, Yonsei University, Seoul 120-749, Korea
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19
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Njikang GN, Cao L, Gauthier M. Self-Assembly of Arborescent Polystyrene-graft-Poly(ethylene oxide) Copolymers at the Air/Water Interface. MACROMOL CHEM PHYS 2008. [DOI: 10.1002/macp.200700619] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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20
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Liu G, Wu D, Ma C, Zhang G, Wang H, Yang S. Insight into the Origin of the Thermosensitivity of Poly[2-(dimethylamino)ethyl methacrylate]. Chemphyschem 2007; 8:2254-9. [PMID: 17879258 DOI: 10.1002/cphc.200700464] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
We investigate the effects of pH and temperature on the conformational changes of poly[2-(dimethylamino)ethyl methacrylate] (PDEM) chains at the air/water interface by using Langmuir balance and sum frequency generation vibrational spectroscopy. At pH 4, the tertiary amine groups are fully charged and the PDEM chains are so hydrophilic that they completely enter into the water phase and do not exhibit thermosensitivity. At pH 7, these groups are only partially charged, and the accompanying hydration/dehydration--followed by repartitioning into the water and air phases--gives rise to a marked thermosensitivty. Finally, at pH 10, the tertiary amine groups become uncharged and thus preferentially stay in the hydrophobic air phase, devoid of associated water molecules, which results in the surface-pressure change (DeltaPi) being nearly independent of the temperature. Our Langmuir-balance experiments, coupled with surface-sensitive spectroscopy, demonstrate that: 1) the thermosensitivity of the PDEM chains relates to the hydration/dehydration of the tertiary amine groups, 2) the phase transition of thermosensitive polymers is most likely initiated by the dehydration of the chains, and 3) the phase transition of thermosensitive polymers at the air/water interface is markedly different from that in aqueous solution because of the redistribution of the macromolecular segments induced by the asymmetric forces at the air/water interface.
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Affiliation(s)
- Guangming Liu
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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21
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González-Pérez A, Contal C, Krafft MP. Experimental evidence for a surface concentration-dependent mechanism of formation of hemimicelles in Langmuir monolayers of semi-fluorinated alkanes. SOFT MATTER 2007; 3:191-193. [PMID: 32680264 DOI: 10.1039/b613265k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
We show that formation of surface hemimicelles by a series of molecular semi-fluorinated alkanes CFCH (F8Hm diblocks; = 14, 16, 18, 20) in Langmuir-Blodgett monolayers is not promoted by surface pressure, but depends on the surface area available before transfer, hence on a critical surface concentration. Evidence is provided for the presence of isolated micelles at zero surface pressure (very large molecular area) for certain FnHm diblocks. It is the molecular structure of the diblock that essentially determines the morphology of the hemimicelles, independently of compression conditions.
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Affiliation(s)
- Alfredo González-Pérez
- Institut Charles Sadron (CNRS UPR 22), 6 rue Boussingault, 67083, Strasbourg, Cedex, France.
| | - Christophe Contal
- Institut Charles Sadron (CNRS UPR 22), 6 rue Boussingault, 67083, Strasbourg, Cedex, France.
| | - Marie Pierre Krafft
- Institut Charles Sadron (CNRS UPR 22), 6 rue Boussingault, 67083, Strasbourg, Cedex, France.
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22
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Kaewsaiha P, Matsumoto K, Matsuoka H. Nanostructure and transition of a strong polyelectrolyte brush at the air/water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:20-4. [PMID: 17190479 DOI: 10.1021/la061444x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
The strong polyelectrolyte layer in the monolayer of ionic amphiphilic diblock copolymers at the air/water interface consists of carpet and brush layers when the brush density is satisfactorily high like that of the weak acid polymer. Also, a drastic structural change was induced by the addition of salt to the brush layer. In this study, the critical brush density for the transition between "carpet-only" and "carpet + brush" structures for the strongly ionic amphiphilic diblock copolymer, poly(hydrogenated isoprepene)-b-poly(styrene sulfonic acid) sodium salt, monolayer was measured by an in situ X-ray reflectivity technique. The critical brush density was found to be about 0.12 nm-2, which is lower than that observed for a weak acid polymer and, unlike the weak acid polymer, is independent of the hydrophilic chain length. This difference might be attributed to the strong ionic nature of the brush chain. In addition, the reversibility of the transition was confirmed. The effect of salt addition to the nanostructure of the carpet layer was examined in detail. No structural change was found, indicating that most of the ionic groups in the carpet layer do not show an ionic nature because of counterion condensation.
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Affiliation(s)
- Ploysai Kaewsaiha
- Department of Polymer Chemistry, Kyoto University, Kyoto, 615-8510, Japan
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24
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Penfold J. Surface-induced structures in surfactant and polymer–surfactant systems: the potential for interesting surface dynamics. JOURNAL OF NEUTRON RESEARCH 2006. [DOI: 10.1080/10238160600974393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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25
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Cheng CX, Jiao TF, Tang RP, Chen EQ, Liu MH, Xi F. Compression-Induced Hierarchical Nanostructures of a Poly(ethylene oxide)-block-Dendronized Polymethacrylate Copolymer at the Air/Water Interface. Macromolecules 2006. [DOI: 10.1021/ma0614500] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cai-Xia Cheng
- State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; CAS Key Laboratory of Colloid and Interface Science, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; and Department of Polymer Science and Engineering and The Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ti-Feng Jiao
- State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; CAS Key Laboratory of Colloid and Interface Science, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; and Department of Polymer Science and Engineering and The Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ru-Pei Tang
- State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; CAS Key Laboratory of Colloid and Interface Science, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; and Department of Polymer Science and Engineering and The Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Er-Qiang Chen
- State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; CAS Key Laboratory of Colloid and Interface Science, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; and Department of Polymer Science and Engineering and The Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Ming-Hua Liu
- State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; CAS Key Laboratory of Colloid and Interface Science, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; and Department of Polymer Science and Engineering and The Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Fu Xi
- State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; CAS Key Laboratory of Colloid and Interface Science, Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, China; and Department of Polymer Science and Engineering and The Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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26
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Peetla C, Graf K, Kressler J. Langmuir monolayer and Langmuir–Blodgett films of amphiphilic triblock copolymers with water-soluble middle block. Colloid Polym Sci 2006. [DOI: 10.1007/s00396-006-1527-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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Rehfeldt F, Steitz R, Armes SP, von Klitzing R, Gast AP, Tanaka M. Reversible Activation of Diblock Copolymer Monolayers at the Interface by pH Modulation, 1: Lateral Chain Density and Conformation. J Phys Chem B 2006; 110:9171-6. [PMID: 16671730 DOI: 10.1021/jp054532j] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
This study focuses on the design of chemically regulated surfaces that allow for reversible control of the interactions between biological matter (cells and proteins) and planar substrates. As a tunable interlayer, we use a monolayer of a near-monodisperse poly[2-(dimethylamino)ethyl methacrylate-block-methyl methacrylate] (PDMAEMA-PMMA) diblock copolymer. Owing to the relatively large fraction (50%) of the hydrophobic PMMA block, this copolymer forms a stable Langmuir monolayer at the air/water interface. Both in situ and ex situ film balance experiments suggest that the hydrophilic PDMAEMA block adsorbs to the air/water interface in its uncharged state (pH 8.5), but stretches into the subphase in its charged state (pH 5.5). Optimization of the preparation protocols enables us to fabricate stable, homogeneous diblock copolymer films on hydrophobized substrates via Langmuir-Schaefer transfer at well-defined lateral chain densities. Ellipsometry and X-ray reflectivity studies of the transferred films confirm that the film thickness can be systematically regulated by the lateral chain densities. The transferred copolymer films remain stable in water for about a week, suggesting that they are promising materials for the creation of pH-controlled solid substrates for the support of biological matter such as proteins and cells.
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Affiliation(s)
- Florian Rehfeldt
- Physik Department E22, Technische Universität München, James-Franck-Str., D-85748 Garching, Germany.
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Rehfeldt F, Steitz R, Armes SP, von Klitzing R, Gast AP, Tanaka M. Reversible Activation of Diblock Copolymer Monolayers at the Interface by pH Modulation, 2: Membrane Interactions at the Solid/Liquid Interface. J Phys Chem B 2006; 110:9177-82. [PMID: 16671731 DOI: 10.1021/jp054533b] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A monolayer of the pH-responsive poly[2-(dimethylamino)ethyl methacrylate-block-methyl methacrylate] diblock copolymer [PDMAEMA-PMMA] was transferred from the air/water interface to a silicon substrate for evaluation as a tunable interlayer between biological material and solid substrates. Specular neutron reflectivity experiments revealed that the weak polyelectrolyte PDMAEMA chains at the solid/liquid interface can be reversibly activated by pH modulation. The thickness, scattering length density, and surface roughness of the polymer film can be systematically controlled by pH titration. As a simple model of plasma membranes, a lipid bilayer was deposited onto the polymer film. The membrane-substrate interaction was characterized by neutron reflectivity experiments, demonstrating that the membrane-substrate distance could be reversibly regulated by pH titration. These results confirm the potential of stimuli-responsive polymers for precise control of cell-surface interactions.
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Affiliation(s)
- Florian Rehfeldt
- Physik Department E22, Technische Universität München, James-Franck-Str., D-85748 Garching, Germany.
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29
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Bowers J, Amos KE, Bruce DW, Webster JRP. Surface and aggregation behavior of aqueous solutions of Ru(II) metallosurfactants. 3. Effect of chain number and orientation on the structure of adsorbed films of [Ru(bipy)2(bipy')]Cl2 complexes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:1346-1353. [PMID: 15697280 DOI: 10.1021/la0478705] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The surface behavior of a range of surfactant [Ru(bipy)(2)(p,p'-dialkyl-2,2'-bipy)]Cl(2) complexes, which we express as Ru(q)(p)C(n) where n is the alkyl chain length, p refers to the substitution position on the bipyridine ligand (=4 or 5), and q (=1 or 2) is the number of substituted alkyl chains, has been examined using neutron reflectometry. The adsorption of the single-chain Ru(1)(4)C(19) and Ru(1)(5)C(19) surfactants is strongly time-dependent, taking in excess of 10 h to form an equilibrium film. It is suggested that the slow adsorption rate is related to the alkyl chain length rather than the low monomer concentration present in the solutions. At concentrations below the critical micelle concentration (cmc) of Ru(1)(4)C(19), the film of Ru(1)(5)C(19) is denser than that of Ru(1)(4)C(19) at comparable concentration, consistent with the mass densities of the bulk solids, whereas at concentrations close to and greater than this cmc the converse pertains. Close to the cmc, the adsorbed films possess an average area per molecule significantly less than the nominal headgroup area of the surfactants (approximately 30 angstroms(2) compared with approximately 100 angstroms(2)). This fact together with consideration of the thickness and density of the adsorbed films leads to the conjecture that surface aggregates may be the adsorbing units. The adsorption of the double-chain surfactant Ru(1)(p)C(19), in contrast to the behavior of the Ru(1)(p)C(19) surfactants, is weak and independent of time. This behavior is attributed to the alkyl chain orientation. The adsorption behavior of a racemic mixture of the Delta and Lambda isomers of Ru(2)(4)C(19) has been compared with that of the Delta isomer. It is found that the film of racemic material is more closely packed than that of the resolved complex.
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Affiliation(s)
- James Bowers
- Department of Chemistry, University of Exeter, Stocker Road, Exeter EX4 4QD, UK.
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30
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Li H, Liu Q, Xu M, Bu W, Lin X, Wu L, Shen J. Length-Controlled Rodlike Self-Assemblies in Binary Mixed Langmuir−Blodgett Monolayers on Mica. J Phys Chem B 2005; 109:2855-61. [PMID: 16851297 DOI: 10.1021/jp046816u] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this paper, atomic force microscopy (AFM) has been used to investigate the morphology of monolayers of the amphiphilic rod-coil diblock molecule (EO7OPV) containing oligo(phenylene vinylene) dimer (OPV) and poly(ethylene oxide) (PEO) as well as the morphology of mixed monolayers of EO7OPV and palmitic acid (PA) deposited onto mica by the Langmuir-Blodgett technique. At surface pressures higher than 3 mN/m, EO7OPV forms regular-shaped aggregates with a monomolecular layer structure, where the hydrophilic PEO blocks are adsorbed onto the mica substrate and the hydrophobic OPV blocks form an ordered crystalline OPV layer on the top of the PEO layer through the strong pi-pi stacking interaction. In the mixed LB monolayers of EO7OPV and PA, the phase separation occurs. At a certain mixed ratio, EO7OPV molecules form rodlike domains with regular shape and uniform size at surface pressures higher than 3 mN/m. With the increase of the molar fraction of PA, the rodlike domains consisting of EO7OPV are elongated. The length of the rodlike domains can be tuned easily in a large range by altering the molar ratio of EO7OPV and PA. In addition, the rodlike domains are oriented to specific directions, corresponding to the directions of the potassium ion array on the mica surface having 6-fold symmetry. We demonstrate the possible formation mechanism and the elongation origin of rodlike domains in mixed LB monolayers and propose the two-step formation process of oriented rodlike domains deposited onto the mica substrate.
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Affiliation(s)
- Hongbo Li
- Key Laboratory for Supramolecular Structure and Materials of Ministry of Education, Jilin University, Changchun, 130012, PRC
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31
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Peleshanko S, Jeong J, Shevchenko VV, Genson KL, Pikus Y, Ornatska M, Petrash S, Tsukruk VV. Synthesis and Properties of Asymmetric Heteroarm PEOn-b-PSm Star Polymers with End Functionalities. Macromolecules 2004. [DOI: 10.1021/ma0497557] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- S. Peleshanko
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, The Institute of Macromolecular Chemistry, Kiev, 02160, Ukraine, and Corporate Research, National Starch and Chemical Company, Bridgewater, New Jersey 08807
| | - J. Jeong
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, The Institute of Macromolecular Chemistry, Kiev, 02160, Ukraine, and Corporate Research, National Starch and Chemical Company, Bridgewater, New Jersey 08807
| | - V. V. Shevchenko
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, The Institute of Macromolecular Chemistry, Kiev, 02160, Ukraine, and Corporate Research, National Starch and Chemical Company, Bridgewater, New Jersey 08807
| | - K. L. Genson
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, The Institute of Macromolecular Chemistry, Kiev, 02160, Ukraine, and Corporate Research, National Starch and Chemical Company, Bridgewater, New Jersey 08807
| | - Yu. Pikus
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, The Institute of Macromolecular Chemistry, Kiev, 02160, Ukraine, and Corporate Research, National Starch and Chemical Company, Bridgewater, New Jersey 08807
| | - M. Ornatska
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, The Institute of Macromolecular Chemistry, Kiev, 02160, Ukraine, and Corporate Research, National Starch and Chemical Company, Bridgewater, New Jersey 08807
| | - S. Petrash
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, The Institute of Macromolecular Chemistry, Kiev, 02160, Ukraine, and Corporate Research, National Starch and Chemical Company, Bridgewater, New Jersey 08807
| | - V. V. Tsukruk
- Department of Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, The Institute of Macromolecular Chemistry, Kiev, 02160, Ukraine, and Corporate Research, National Starch and Chemical Company, Bridgewater, New Jersey 08807
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32
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Kaewsaiha P, Matsumoto K, Matsuoka H. Synthesis and nanostructure of strong polyelectrolyte brushes in amphiphilic diblock copolymer monolayers on a water surface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:6754-6761. [PMID: 15274582 DOI: 10.1021/la0491145] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We synthesized an ionic amphiphilic diblock copolymer, poly(hydrogenated isoprene)-b-poly(styrenesulfonic acid) (PIp-h2-b-PSS), by living anionic polymerization, and the nanostructure of its monolayer spread on a water surface was directly investigated by the in situ X-ray reflectivity technique. The monolayer of the diblock copolymer on a water surface had a smooth hydrophobic PIp-h2 layer on water and a "carpet"/polymer brush double layer in a hydrophilic sodium polystyrene sulfonate (PSSNa) layer under the water. The surface pressure dependence and PSSNa chain length dependence of the PIp-h2 layer thickness and the brush nanostructure were quantitatively studied. The effect of salt concentration in the subphase was also investigated in aqueous solutions containing 0-2 M NaCl. The salt effect on monolayer structure occurred at around 0.2 M. The thickness of the PSS brush layer decreased at salt concentrations above 0.2 M, while no structural change was observed below 0.2 M. This critical salt concentration is thought to be related to the balance of ionic concentrations inside the brush and in bulk solution.
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Affiliation(s)
- Ploysai Kaewsaiha
- Department of Polymer Chemistry, Kyoto University, Kyoto 615-8510, Japan
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33
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Abstract
Recent applications of neutron reflectometry to the study of wet interfaces are described. An outline is given of the basic principles that allow the techniques to determine composition and structure in a variety of situations. These are the adsorption of surfactant molecules at air/liquid and solid/liquid interfaces, the shape of the segment-density profiles of different types of polymer, including block copolymers and polyelectrolytes, adsorption in mixed surfactant and polymer/surfactant systems, and interfacial systems of biophysical interest.
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Affiliation(s)
- R K Thomas
- Physical Chemistry Laboratory, South Parks Road, Oxford, United Kingdom.
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34
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Penfold J, Sivia DS, Staples E, Tucker I, Thomas RK. Surface ordering in dilute dihexadecyl dimethyl ammonium bromide solutions at the air-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2004; 20:2265-2269. [PMID: 15835681 DOI: 10.1021/la035432c] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
At elevated temperatures and in dilute solution, we have observed lamellar surface ordering at the air-water interface of dihexadecyl dimethylammonium bromide, DHDAB, in the presence of electrolyte. With increasing temperature, the onset in ordering is observed between 35 and 40 degrees C. At 40 degrees C, there is an abrupt change in the lamellar spacing, from approximately 33 to approximately 40 A. Furthermore, in the presence of the cosurfactant benzyl alcohol, the ordering occurs at a lower temperature, between 20 and 25 degrees C. The change in lamellar spacing with temperature is attributed to a surface-induced transition, similar to the Lbeta to Lalpha phase transition observed in bulk lamellar dispersions.
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Affiliation(s)
- J Penfold
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, OXON, United Kingdom
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35
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Mouri E, Matsumoto K, Matsuoka H. Carpetlike dense-layer formation in a polyelectrolyte brush at the air/water interface. ACTA ACUST UNITED AC 2003. [DOI: 10.1002/polb.10561] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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36
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Francis R, Skolnik AM, Carino SR, Logan JL, Underhill RS, Angot S, Taton D, Gnanou Y, Duran RS. Aggregation and Surface Morphology of a Poly(ethylene oxide)-block-polystyrene Three-Arm Star Polymer at the Air/Water Interface Studied by AFM. Macromolecules 2002. [DOI: 10.1021/ma020290z] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Raju Francis
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, 32611-7200; and Laboratoire de Chimie des Polymères Organiques, ENSCPB, University of Bordeaux I, 16 Avenue Pey−Berland, 33607 Pessac Cedex, France
| | - Andrew M. Skolnik
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, 32611-7200; and Laboratoire de Chimie des Polymères Organiques, ENSCPB, University of Bordeaux I, 16 Avenue Pey−Berland, 33607 Pessac Cedex, France
| | - Stephen R. Carino
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, 32611-7200; and Laboratoire de Chimie des Polymères Organiques, ENSCPB, University of Bordeaux I, 16 Avenue Pey−Berland, 33607 Pessac Cedex, France
| | - Jennifer L. Logan
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, 32611-7200; and Laboratoire de Chimie des Polymères Organiques, ENSCPB, University of Bordeaux I, 16 Avenue Pey−Berland, 33607 Pessac Cedex, France
| | - Royale S. Underhill
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, 32611-7200; and Laboratoire de Chimie des Polymères Organiques, ENSCPB, University of Bordeaux I, 16 Avenue Pey−Berland, 33607 Pessac Cedex, France
| | - Stéphanie Angot
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, 32611-7200; and Laboratoire de Chimie des Polymères Organiques, ENSCPB, University of Bordeaux I, 16 Avenue Pey−Berland, 33607 Pessac Cedex, France
| | - Daniel Taton
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, 32611-7200; and Laboratoire de Chimie des Polymères Organiques, ENSCPB, University of Bordeaux I, 16 Avenue Pey−Berland, 33607 Pessac Cedex, France
| | - Yves Gnanou
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, 32611-7200; and Laboratoire de Chimie des Polymères Organiques, ENSCPB, University of Bordeaux I, 16 Avenue Pey−Berland, 33607 Pessac Cedex, France
| | - Randolph S. Duran
- The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, P.O. Box 117200, Gainesville, 32611-7200; and Laboratoire de Chimie des Polymères Organiques, ENSCPB, University of Bordeaux I, 16 Avenue Pey−Berland, 33607 Pessac Cedex, France
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Matsumoto K, Mizuno U, Matsuoka H, Yamaoka H. Synthesis of Novel Silicon-Containing Amphiphilic Diblock Copolymers and Their Self-Assembly Formation in Solution and at Air/Water Interface. Macromolecules 2001. [DOI: 10.1021/ma011254n] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kozo Matsumoto
- Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
| | - Utako Mizuno
- Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
| | - Hideki Matsuoka
- Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
| | - Hitoshi Yamaoka
- Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
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38
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Seo Y, Im JH, Lee JS, Kim JH. Aggregation Behaviors of a Polystyrene-b-poly(methyl methacrylate) Diblock Copolymer at the Air/Water Interface. Macromolecules 2001. [DOI: 10.1021/ma002119y] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yongsok Seo
- Polymer Processsing Laboratory, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, Korea 130-650, and Department of Molecular Science and Technology, Ajou University, 5 Wonchondong, Paldalgu, Suwon, Kyoungkido, Korea 442-749
| | - Jung-Hyuk Im
- Polymer Processsing Laboratory, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, Korea 130-650, and Department of Molecular Science and Technology, Ajou University, 5 Wonchondong, Paldalgu, Suwon, Kyoungkido, Korea 442-749
| | - Jong-Suk Lee
- Polymer Processsing Laboratory, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, Korea 130-650, and Department of Molecular Science and Technology, Ajou University, 5 Wonchondong, Paldalgu, Suwon, Kyoungkido, Korea 442-749
| | - Jae-Ho Kim
- Polymer Processsing Laboratory, Korea Institute of Science and Technology, P.O. Box 131, Cheongryang, Seoul, Korea 130-650, and Department of Molecular Science and Technology, Ajou University, 5 Wonchondong, Paldalgu, Suwon, Kyoungkido, Korea 442-749
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39
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Bütün V, Armes S, Billingham N. Synthesis and aqueous solution properties of near-monodisperse tertiary amine methacrylate homopolymers and diblock copolymers. POLYMER 2001. [DOI: 10.1016/s0032-3861(01)00066-0] [Citation(s) in RCA: 532] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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40
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de Paz Báñez M, Robinson K, Vamvakaki M, Lascelles S, Armes S. Synthesis of novel cationic polymeric surfactants. POLYMER 2000. [DOI: 10.1016/s0032-3861(00)00217-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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41
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Nakano M, Deguchi M, Endo H, Matsumoto K, Matsuoka H, Yamaoka H. Self-Assembly of Poly(1,1-diethylsilabutane)-block-poly(2-hydroxyethyl methacrylate) Block Copolymer. 2. Monolayer at the Air−Water Interface. Macromolecules 1999. [DOI: 10.1021/ma9819788] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Minoru Nakano
- Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
| | - Masaki Deguchi
- Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
| | - Hitoshi Endo
- Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
| | - Kozo Matsumoto
- Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
| | - Hideki Matsuoka
- Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
| | - Hitoshi Yamaoka
- Department of Polymer Chemistry, Kyoto University, Kyoto 606-8501, Japan
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42
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R. Lu J. Chapter 2. Neutron reflection study of globular protein adsorption at planar interfaces. ACTA ACUST UNITED AC 1999. [DOI: 10.1039/pc095003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Bandyopadhyay S, Shelley JC, Tarek M, Moore PB, Klein ML. Surfactant Aggregation at a Hydrophobic Surface. J Phys Chem B 1998. [DOI: 10.1021/jp982051c] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sanjoy Bandyopadhyay
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, Corporate Research Division, The Procter & Gamble Company, Miami Valley Laboratories, Cincinnati, Ohio 45253-8707, and NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
| | - John C. Shelley
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, Corporate Research Division, The Procter & Gamble Company, Miami Valley Laboratories, Cincinnati, Ohio 45253-8707, and NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
| | - Mounir Tarek
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, Corporate Research Division, The Procter & Gamble Company, Miami Valley Laboratories, Cincinnati, Ohio 45253-8707, and NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
| | - Preston B. Moore
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, Corporate Research Division, The Procter & Gamble Company, Miami Valley Laboratories, Cincinnati, Ohio 45253-8707, and NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
| | - Michael L. Klein
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, Corporate Research Division, The Procter & Gamble Company, Miami Valley Laboratories, Cincinnati, Ohio 45253-8707, and NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899
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44
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An SW, Thomas RK, Baines FL, Billingham NC, Armes SP, Penfold J. Neutron Reflectivity of an Adsorbed Water-Soluble Block Copolymer at the Air/Water Interface: The Effects of pH and Ionic Strength. J Phys Chem B 1998. [DOI: 10.1021/jp9809033] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | | | | | - J. Penfold
- ISIS, CCLRC, Chilton, Didcot, Oxon., OX11 0QX, U.K
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