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Sun R, Yang W, Wang W. A P123/benzyl alcohol/TEOS/HCl(aq.) templating system for preparation of KIT-6 type mesoporous silica with morphological and structural control. Dalton Trans 2022; 51:16439-16443. [DOI: 10.1039/d2dt02884k] [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]
Abstract
A new P123 templating system is reported for preparing KIT-6s with a large synthesis domain and controllable particle morphology by using benzyl alcohol (Bz) as a co-solvent based on the partitioned cooperative self-assembly (PCSA) principle.
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Affiliation(s)
- Rui Sun
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, Liaoning 110819, China
| | - Weiling Yang
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, Liaoning 110819, China
| | - Wei Wang
- Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, Liaoning 110819, China
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2
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Patel D, Agarwal S, Ray D, Kuperkar K, Aswal VK, Bahadur P. An expedient in to the phase behaviour and scattering profile in PEO-PPO-PEO block copolymer mixed systems in aqueous solution. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126330] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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3
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Xin C, Ren Y, Zhang Z, Liu L, Wang X, Yang J. Enhancement of Hydrothermal Stability and CO 2 Adsorption of Mg-MOF-74/MCF Composites. ACS OMEGA 2021; 6:7739-7745. [PMID: 33778284 PMCID: PMC7992183 DOI: 10.1021/acsomega.1c00098] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 02/26/2021] [Indexed: 06/12/2023]
Abstract
Hierarchical porous composite Mg-MOF-74/MCFs were successfully synthesized using a simple and facile method under in situ solvothermal conditions. Textural structures and morphologies of the composites were characterized by X-ray diffraction (XRD), N2 adsorption-desorption isotherms, and scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The results demonstrate that a large amount of nanosized Mg-MOF-74 particles is incorporated into the pores of mesocellular siliceous foams (MCFs) without remarkable aggregation and the composites possess microporous and mesoporous characteristics of both components. In addition, CO2 adsorption properties of the composites were tested in a fixed bed with/without hydrothermal treatment. The total CO2 adsorption capacities were calculated by breakthrough curves. The CO2 adsorption capacity of the composites reaches 1.68 mmol/g, which is smaller than that of pristine Mg-MOF-74. However, the total CO2 adsorption capacity of the composites after hydrothermal treatment reaches 2.66 mmol/g, which is larger than that of Mg-MOF-74 (2.39 mmol/g) under the same condition. XRD patterns and SEM images of the composites demonstrate that the hydrothermal stability and CO2 adsorption performance of the composites were improved compared with those of pristine Mg-MOF-74 after hydrothermal treatment.
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Affiliation(s)
- Chunling Xin
- Department
of Chemistry and Chemical & Environmental Engineering, Weifang University, Weifang 261061, China
| | - Yang Ren
- Department
of Chemistry and Chemical & Environmental Engineering, Weifang University, Weifang 261061, China
| | | | - Lili Liu
- Department
of Chemistry and Chemical & Environmental Engineering, Weifang University, Weifang 261061, China
| | - Xia Wang
- Department
of Chemistry and Chemical & Environmental Engineering, Weifang University, Weifang 261061, China
| | - Jinmei Yang
- Department
of Chemistry and Chemical & Environmental Engineering, Weifang University, Weifang 261061, China
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4
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Landazuri G, Fernandez V, Soltero J, Rharbi Y. Length of the Core Forming Block Effect on Fusion and Fission Dynamics at Equilibrium in PEO–PPO–PEO Triblock Copolymer Micelles in the Spherical Regime. Macromolecules 2021. [DOI: 10.1021/acs.macromol.0c01520] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- G. Landazuri
- Université Grenoble Alpes—LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
- Departamento de Ingeniería Química, CUCEI, Universidad de Guadalajara, Blvd. M. García Barragán # 1421, Guadalajara, Jalisco 44430, Mexico
| | - V.V.A. Fernandez
- Université Grenoble Alpes—LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
- Departamento de Ciencias Tecnológicas, Universidad de Guadalajara, Av. Universidad No. 1115, Ocotlán, Jalisco 47820, Mexico
| | - J.F.A. Soltero
- Université Grenoble Alpes—LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
- Departamento de Ingeniería Química, CUCEI, Universidad de Guadalajara, Blvd. M. García Barragán # 1421, Guadalajara, Jalisco 44430, Mexico
| | - Y. Rharbi
- Université Grenoble Alpes—LRP, F-38041 Grenoble, France
- CNRS, LRP, F-38041 Grenoble, France
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5
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Jung H, Gang SE, Kim JM, Heo TY, Lee S, Shin E, Kim BS, Choi SH. Regulating Dynamics of Polyether-Based Triblock Copolymer Hydrogels by End-Block Hydrophobicity. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c01939] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Hyunjoon Jung
- Department of Chemical Engineering, Hongik University, Seoul 04066, Republic of Korea
| | - Seong-Eun Gang
- Department of Chemical Engineering, Hongik University, Seoul 04066, Republic of Korea
| | - Jung-Min Kim
- Department of Chemical Engineering, Hongik University, Seoul 04066, Republic of Korea
| | - Tae-Young Heo
- Department of Chemical Engineering, Hongik University, Seoul 04066, Republic of Korea
| | - Sangho Lee
- Department of Chemical Engineering, Hongik University, Seoul 04066, Republic of Korea
| | - Eeseul Shin
- Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
| | - Byeong-Su Kim
- Department of Chemistry, Yonsei University, Seoul 03722, Republic of Korea
| | - Soo-Hyung Choi
- Department of Chemical Engineering, Hongik University, Seoul 04066, Republic of Korea
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6
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Boccardo G, Buffo A, Marchisio D. Simulation of Mixing in Structured Fluids with Dissipative Particle Dynamics and Validation with Experimental Data. Chem Eng Technol 2019. [DOI: 10.1002/ceat.201800731] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Gianluca Boccardo
- Politecnico di TorinoDepartment of Applied Science and Technology, Institute of Chemical Engineering C.so Duca degli Abruzzi 24 10129 Torino Italy
| | - Antonio Buffo
- Politecnico di TorinoDepartment of Applied Science and Technology, Institute of Chemical Engineering C.so Duca degli Abruzzi 24 10129 Torino Italy
| | - Daniele Marchisio
- Politecnico di TorinoDepartment of Applied Science and Technology, Institute of Chemical Engineering C.so Duca degli Abruzzi 24 10129 Torino Italy
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7
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Grillo I, Morfin I, Prévost S. Structural Characterization of Pluronic Micelles Swollen with Perfume Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:13395-13408. [PMID: 30350691 DOI: 10.1021/acs.langmuir.8b03050] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The insertion in nonionic polymer micelles (Pluronics F127) of seven essential oils and some of the pure compounds that compose them was investigated by complementary differential scanning calorimetry, small-angle X-ray, and neutron scattering (SAXS and SANS). The study revealed various insertion and swelling behaviors for the different oil molecules, an evidence of different interaction mechanisms involved between oils and Pluronic monomers. Thermodynamically, the addition of oil increased the micellization enthalpy due to an enhanced release of water molecules, leading subsequently to a decrease of the critical micellar temperature (CMT). Structurally, with oil, SANS revealed the presence of large aggregates at lower temperature than the CMT for which their size is maximal. Above the CMT, the size decreased and the equilibrium was reached a few degrees after the temperature corresponding to the maximum of the endothermic peak. At 37 °C, the detailed combined SANS and SAXS analysis demonstrated a partial phase separation between the oil and the poly(propylene oxide) core. The hydrophilic stabilizing poly(ethylene oxide) shell remains unchanged.
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Affiliation(s)
- I Grillo
- Institut Laue Langevin , DS/LSS, CS 20156 , 38042 Grenoble Cedex 9, France
| | - I Morfin
- Université Grenoble Alpes, LiPhy , 38000 Grenoble , France
| | - S Prévost
- Institut Laue Langevin , DS/LSS, CS 20156 , 38042 Grenoble Cedex 9, France
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Unexpected Phase Behavior of Pluronic Polymer-Organic Derivative Mixtures Depending on Temperature in Aqueous Solution. MICROMACHINES 2018; 9:mi9100505. [PMID: 30424438 PMCID: PMC6215220 DOI: 10.3390/mi9100505] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/15/2018] [Revised: 09/28/2018] [Accepted: 10/01/2018] [Indexed: 11/17/2022]
Abstract
The phase behavior of amphiphilic Pluronic block copolymers in aqueous solution is of importance for a broad spectrum of practical applications but has not been fully exploited yet. Here, the phase behavior of the mixture of the Pluronic P65 and P105 triblock copolymer, (which have the same composition of PEO and PPO but the different molecular weight) and organic derivative, 5-methyl salicylic acid (5mS), in aqueous solution has been investigated by using small angle neutron scattering (SANS). According to the temperature and the 5mS concentration, SANS measurements showed that the P65-5mS mixtures sequentially transform into a random coil, sphere, vesicle, cylinder, and vesicle again, while the P105-5mS mixtures form spherical particles with two different sizes without any topological phase transition. Upon heating, the formation of two different kinds of the vesicle structure of amphiphilic block copolymer in aqueous solution is very unusual. This phase behavior was explained as the coupled effect of the simultaneous increase of the hydrophobicity of the polymer and the solubility of 5mS molecules upon heating. This result gives fundamental information for the practical use of Pluronic polymers in nano- and bio-science and it provides a simple route for the fabrication of the nanostructure without a complicated procedure.
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9
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Pegg JC, Czajka A, Hazell G, Hill C, Peach J, Rogers SE, Eastoe J. Solubilisation of oils in aqueous solutions of a random cationic copolymer. J Colloid Interface Sci 2017; 502:210-218. [DOI: 10.1016/j.jcis.2017.04.093] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 04/27/2017] [Accepted: 04/28/2017] [Indexed: 02/02/2023]
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10
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Bodratti AM, Sarkar B, Alexandridis P. Adsorption of poly(ethylene oxide)-containing amphiphilic polymers on solid-liquid interfaces: Fundamentals and applications. Adv Colloid Interface Sci 2017; 244:132-163. [PMID: 28069108 DOI: 10.1016/j.cis.2016.09.003] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2015] [Revised: 09/23/2016] [Accepted: 09/23/2016] [Indexed: 12/30/2022]
Abstract
The adsorption of amphiphilic molecules of varying size on solid-liquid interfaces modulates the properties of colloidal systems. Nonionic, poly(ethylene oxide) (PEO)-based amphiphilic molecules are particularly useful because of their graded hydrophobic-hydrophilic nature, which allows for adsorption on a wide array of solid surfaces. Their adsorption also results in other useful properties, such as responsiveness to external stimuli and solubilization of hydrophobic compounds. This review focuses on the adsorption properties of PEO-based amphiphiles, beginning with a discussion of fundamental concepts pertaining to the adsorption of macromolecules on solid-liquid interfaces, and more specifically the adsorption of PEO homopolymers. The main portion of the review highlights studies on factors affecting the adsorption and surface self-assembly of PEO-PPO-PEO block copolymers, where PPO is poly(propylene oxide). Block copolymers of this type are commercially available and of interest in several fields, due to their low toxicity and compatibility in aqueous systems. Examples of applications relevant to the interfacial behavior of PEO-PPO-PEO block copolymers are paints and coatings, detergents, filtration, and drug delivery. The methods discussed herein for manipulating the adsorption properties of PEO-PPO-PEO are emphasized for their ability to shed light on molecular interactions at interfaces. Knowledge of these interactions guides the formulation of novel materials with useful mesoscale organization and micro- and macrophase properties.
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11
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Nagarajan R. Constructing a molecular theory of self-assembly: Interplay of ideas from surfactants and block copolymers. Adv Colloid Interface Sci 2017; 244:113-123. [PMID: 27993352 DOI: 10.1016/j.cis.2016.12.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Revised: 11/29/2016] [Accepted: 12/02/2016] [Indexed: 12/17/2022]
Abstract
Low molecular weight surfactants and high molecular weight block copolymers display analogous self-assembly behavior in solutions and at interfaces, generating nanoscale structures of different shapes. Understanding the link between the molecular structure of these amphiphiles and their self-assembly behavior has been the goal of theoretical studies. Despite the analogies between surfactants and block copolymers, models predicting their self-assembly behavior have evolved independent of one another, each overlooking the molecular feature considered critical to the other. In this review, we focus on the interplay of ideas pertaining to surfactants and block copolymers in three areas of self-assembly. First, we show how improved free energy models have evolved by applying ideas from surfactants to block copolymers and vice versa, giving rise to a unitary theoretical framework and better predictive capabilities for both classes of amphiphiles. Second we show that even though molecular packing arguments are often used to explain aggregate shape transitions resulting from self-assembly, the molecular packing considerations are more relevant in the case of surfactants whereas free energy criteria are relevant for block copolymers. Third, we show that even though the surfactant and block copolymer aggregates are small nanostructures, the size differences between them is significant enough to make the interfacial effects control the solubilization of molecules in surfactant micelles while the bulk interactions control the solubilization in block copolymer micelles. Finally, we conclude by identifying recent theoretical progress in adapting the micelle model to a wide variety of self-assembly phenomena and the challenges to modeling posed by emerging novel classes of amphiphiles with complex biological, inorganic or nanoparticle moieties.
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12
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Wu L, Chen L, Sun H. On accuracy of predicting densities and solubility parameters of polymers using atomistic simulations. MOLECULAR SIMULATION 2017. [DOI: 10.1080/08927022.2016.1269258] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Liang Wu
- Ministry of Education Key Laboratory of Scientific and Engineering Computing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, P.R. China
| | - Long Chen
- Ministry of Education Key Laboratory of Scientific and Engineering Computing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, P.R. China
| | - Huai Sun
- Ministry of Education Key Laboratory of Scientific and Engineering Computing, School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, P.R. China
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13
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Koch L, Polek A, Rudd S, Evans D. Macroscopic Electrical Wires from Vapor Deposited Poly(3,4-ethylenedioxythiophene). ACS APPLIED MATERIALS & INTERFACES 2017; 9:65-70. [PMID: 28030759 DOI: 10.1021/acsami.6b14727] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Conducting polymers represent a field of materials innovation that bridges the properties of metals (electrical conduction) with those of traditional polymers (mechanical flexibility). Although electronic properties have been studied, minimal attention is given to their mechanical properties such as tensile strength. This study presents macroscopic wires made from the vapor phase polymerization of poly(3,4-ethylenedioxythiophene) using triblock copolymers as a molecular template. These macroscopic wires are conductive (up to 5 × 104 S/m), and possess tensile properties (Young's modulus ∼1.1 GPa; tensile strength ∼90 MPa) comparable to commercially available polymers (Nylon-6 and poly(methyl methacrylate)), without need for nonconductive mechanical fillers.
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Affiliation(s)
- Lukas Koch
- Department of Materials, ETH Zürich , Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland
- Thin Film Coatings Group, Future Industries Institute, University of South Australia , Mawson Lakes, South Australia 5095, Australia
| | - Anna Polek
- Department of Materials, ETH Zürich , Wolfgang-Pauli-Strasse 10, 8093 Zürich, Switzerland
- Thin Film Coatings Group, Future Industries Institute, University of South Australia , Mawson Lakes, South Australia 5095, Australia
| | - Sam Rudd
- Thin Film Coatings Group, Future Industries Institute, University of South Australia , Mawson Lakes, South Australia 5095, Australia
| | - Drew Evans
- Thin Film Coatings Group, Future Industries Institute, University of South Australia , Mawson Lakes, South Australia 5095, Australia
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14
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Nguyen-Kim V, Prévost S, Seidel K, Maier W, Marguerre AK, Oetter G, Tadros T, Gradzielski M. Solubilization of active ingredients of different polarity in Pluronic® micellar solutions – Correlations between solubilizate polarity and solubilization site. J Colloid Interface Sci 2016; 477:94-102. [DOI: 10.1016/j.jcis.2016.05.017] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 05/12/2016] [Accepted: 05/12/2016] [Indexed: 11/28/2022]
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15
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Li X, Lee YR, Row KH. Synthesis of Mesoporous Siliceous Materials in Choline Chloride Deep Eutectic Solvents and the Application of These Materials to High-Performance Size Exclusion Chromatography. Chromatographia 2016. [DOI: 10.1007/s10337-016-3051-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Shah V, Bharatiya B, Shah DO, Mukherjee T. Correlation of Dynamic Surface Tension with Sedimentation of PTFE Particles and Water Penetration in Powders. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:13725-13733. [PMID: 26625137 DOI: 10.1021/acs.langmuir.5b03725] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The dynamic surface tension of aqueous poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) [(PEO-PPO-PEO)]-type polymeric surfactant (P103, P105, F108, P123, and F127) solutions were correlated with water penetration in packed Teflon powders, the sedimentation of Teflon suspensions in these solutions, foamability, and contact angle measurements on a Teflon surface. The DST trend with bubble lifetime indicated that the overall slowdown in the diffusion process in aqueous solutions is a function of a higher poly(ethylene oxide) (PEO) molecular weight for a given series of block copolymers containing equal PPO molecular weights, favoring slower diffusion kinetics to the air-water interface caused by preferential partitioning in bulk water. The wettability of poly(tetrafluoroethylene) (PTFE) powder illustrates better water penetration for polymers with low molecular weight and lower HLB values. The wettability of F127 solutions decreases with corresponding increases in concentration resulting from higher viscosity, which restrains the diffusion kinetics at the PTFE-water interface. The foamability decreases drastically with higher PEO molecular weight as attributed by slower diffusion kinetics, leading to a decrease in the effective concentration of molecules at the foam interface. The contact angle on glass and the PTFE surface are in good agreement with assumptions made by other analytical techniques showing a lower value of the contact angle with a lower HLB of the Pluronic, which relates to the higher adsorption of molecules at the interface. It is concluded that the adsorption of molecules at the PTFE-water interface decreases in aqueous Pluronic solutions with corresponding increases in the hydrophilic lipophilic balance (HLB), which is consistent with foaming, water penetration in a packed powder of PTFE, the rate of sedimentation, and DST data. A PTFE dispersion containing P123 showed the maximum wettability and lowest sedimentation among the series of block copolymers introduced, which is attributed to faster diffusion kinetics and a higher PPO contribution fostering faster adsorption at the PTFE surface. The dynamic surface tension of aqueous Pluronic solutions seems to correlate well with the adsorption characteristics at the air-water and PTFE-water interfaces.
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Affiliation(s)
- Vidhi Shah
- Shah-Schulman Center for Surface Science and Nanotechnology, Dharmsinh Desai University , Nadiad-387001, Gujarat, India
| | - Bhavesh Bharatiya
- Shah-Schulman Center for Surface Science and Nanotechnology, Dharmsinh Desai University , Nadiad-387001, Gujarat, India
| | - Dinesh O Shah
- Shah-Schulman Center for Surface Science and Nanotechnology, Dharmsinh Desai University , Nadiad-387001, Gujarat, India
- Center for Surface Science and Engineering, Department of Chemical Engineering and Anesthesiology, University of Florida , Gainesville, Florida 32611, United States
- College of Earth and Environmental Sciences, Columbia University , New York, New York 10027, United States
| | - Tulsi Mukherjee
- Shah-Schulman Center for Surface Science and Nanotechnology, Dharmsinh Desai University , Nadiad-387001, Gujarat, India
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17
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Molecular interactions between PEO–PPO–PEO and PPO–PEO–PPO triblock copolymers in aqueous solution. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2015.08.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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18
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Stawicka K, Calvino-Casilda V, Trejda M, Bañares MA, Ziolek M. Mesostructured cellular foams modified by niobium or tantalum and functionalized with (3-mercaptopropyl)trimethoxysilane – Raman inspired reduction of synthesis time. Catal Today 2015. [DOI: 10.1016/j.cattod.2014.11.035] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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19
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Wang S, Liu R, Han C, Wang J, Li M, Yao J, Li H, Wang Y. A novel strategy to synthesize hierarchical, porous carbohydrate-derived carbon with tunable properties. NANOSCALE 2014; 6:13510-13517. [PMID: 25267462 DOI: 10.1039/c4nr03826f] [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
Hydrothermal carbonization (HTC) of carbohydrate is an interesting candidate for the preparation of carbon materials, as it provides an easy, inexpensive and environmental friendly route. However, it is difficult to prepare porous carbon materials by a straight HTC process. Herein, the solubilising technology of micelles was introduced to direct the HTC of fructose by using an amphiphilic block copolymer, poly-(4-vinylpyridine)-block-poly-(ethylene glycol) (P4VP-PEG), as a structure-directing agent. By this strategy, hierarchical porous carbon materials with tunable properties were prepared. It was found that P4VP-PEG micelles could solubilize fructose and confine the formation of primary carbon domains during a sol-gel process. And the micelle size could be adjusted easily by changing the preparation conditions. Accordingly, the particle size of the obtained carbon materials was effectively tuned from 20 to 100 nm by the direction of the primary micelle size. After calcination, the hierarchical porous carbon materials were evidenced as effective electrode materials for supercapacitor with a capacitance of ∼197 F at 1 A g(-1), which was almost four times higher than the carbon materials prepared by a straight HTC process.
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Affiliation(s)
- Shiping Wang
- Carbon Nano Materials Group, Center for Chemistry of High-performance and Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou 310028, P. R. China.
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20
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Kim TH, Song C, Han YS, Jang JD, Choi MC. Spontaneous unilamellar polymer vesicles in aqueous solution. SOFT MATTER 2014; 10:484-490. [PMID: 24652418 DOI: 10.1039/c3sm52519h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A unilamellar polymeric vesicle is a self-assembled structure of a block copolymer that forms a spherical single bilayer structure with a hydrophobic interlayer and a hydrophilic surface. Due to their enhanced colloidal stability and mechanical property, controllable surface functionality, or tunable membrane thickness, polymeric vesicles are useful in nano and bio-science, providing potential applications as nanosized carriers for catalysts, drugs, and enzymes. For fabrication of a unilamellar vesicle, however, preparative procedures with a few steps are inherently required. Herein, without complicated preparative procedures, we report spontaneous unilamellar polymeric vesicles with nanometer sizes (<100 nm), which are prepared by simply mixing a triblock copolymer, Pluronic P85 (PEO26PPO40PEO26), and an organic derivative, 5-methyl salicylic acid (5mS), in aqueous solution. Depending on the 5mS concentration and the temperature, the P85-5mS mixtures presented various self-assembled nanostructures such as spherical and cylindrical micelles or vesicles, which were characterized by small angle neutron scattering and cryo-TEM, resulting in a phase diagram drawn as a function of temperature and the 5mS concentration. Interestingly the critical temperature for the micelle-to-vesicle phase transition was easily controlled by varying the 5mS concentration, i.e. it was decreased with increasing the 5mS concentration.
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Affiliation(s)
- Tae-Hwan Kim
- Neutron Science Division, Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong-gu, Daejeon, 305-353, Republic of Korea.
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Björk EM, Söderlind F, Odén M. Tuning the shape of mesoporous silica particles by alterations in parameter space: from rods to platelets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:13551-13561. [PMID: 24102575 DOI: 10.1021/la403201v] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The knowledge of how to control the pore size and morphology of separated mesoporous silica particles is crucial for optimizing their performance in applications, such as molecular sieves and drug delivery systems. In this work, we have systematically studied the effects of various synthesis parameters to gain a deeper understanding of how particle morphologies can be altered. It was found that the morphology for isolated particles of SBA-15 type, with unusually short and wide pores, could be altered from rods to platelets by variations in the NH4F concentration. The pore length is nearly constant (~300 nm) for the different morphologies, but the particle width is increasing from 200 nm to >3 μm when decreasing the amount of NH4F, and the pore size can be tuned between 10 and 13 nm. Furthermore, other synthesis parameters such as heptane concentration, pH, silica precursor, and additions of ions have also been studied. The trend regarding particle width is independent of heptane concentration, at the same time as heptane increases the particle length up to a plateau value of ~500 nm. In all, parameters controlling particle width, length, and pore size have been separated in order to evaluate their function in the particle formation. Additionally, it was found that the formation time of the particles is strongly affected by the fluoride ion concentration, and a mechanism for particle formation for this system, where micelles transform from a foam, to multilamellar vesicles, and finally to cylindrical micelles, is suggested.
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Affiliation(s)
- Emma M Björk
- Nanostructured Materials, Department of Physics, Chemistry and Biology, Linköping University , Linköping SE-58183, Sweden
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22
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Johnston EV, Verho O, Kärkäs MD, Shakeri M, Tai CW, Palmgren P, Eriksson K, Oscarsson S, Bäckvall JE. Highly Dispersed Palladium Nanoparticles on Mesocellular Foam: An Efficient and Recyclable Heterogeneous Catalyst for Alcohol Oxidation. Chemistry 2012; 18:12202-6. [DOI: 10.1002/chem.201202157] [Citation(s) in RCA: 75] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Indexed: 11/11/2022]
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23
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Liu HY, Prévost S, Gradzielski M. Solubilisation of Oils of Different Polarity in Aqueous Solutions of Pluronic Triblock Copolymers. Z PHYS CHEM 2012. [DOI: 10.1524/zpch.2012.0292] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
The micellisation behaviour of Pluronic F108 was studied as a function of the addition of various more or less polar additives, such as hexanol, geraniol, toluene, methyl heptanoate, polyproylene oxide (PPO), and nitropropane. It is observed that the critical micellisation temperature (CMT) is substantially reduced upon the solubilisation of most of the additives (but not for methyl heptanoate and PPO) and at the same time the concomitant enthalpy of micellisation becomes larger. Both changes in CMT and enthalpy of micellisation are linear with respect to the concentration of additive. The pronouncedness of this effect is related to the polarity of the additive (as characterised for instance by its water solubility) and for instance similar effects are achieved for much smaller amounts of geraniol compared to hexanol. The structural evolution of the Pluronic solutions upon addition of the additives was also followed by SANS experiments and show that relatively small amounts of added solubilisate can have a very pronounced effect on the extent of the micellisation and size of the aggregates formed, i.e., effectively lowering the CMT by rendering the amphiphilic system more hydrophobic and especially the medium chain alcohols show pronounced synergism.
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Affiliation(s)
- Hsin-Yi Liu
- Technische Universität Berlin, Stranski-Laboratorium für Physik./Theoret. Chemie, Berlin, Deutschland
| | - Sylvain Prévost
- Helmholtz-Zentrum Berlin (HZB), Lise-Meitner-Campus, Berlin, Deutschland
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24
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Lee SS, Riduan SN, Erathodiyil N, Lim J, Cheong JL, Cha J, Han Y, Ying JY. Magnetic Nanoparticles Entrapped in Siliceous Mesocellular Foam: A New Catalyst Support. Chemistry 2012; 18:7394-403. [DOI: 10.1002/chem.201102361] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Revised: 02/28/2012] [Indexed: 01/02/2023]
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25
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Bae KH, Ha YJ, Kim C, Lee KR, Park TG. Pluronic/chitosan shell cross-linked nanocapsules encapsulating magnetic nanoparticles. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2012; 19:1571-83. [DOI: 10.1163/156856208786440451] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Affiliation(s)
- Ki Hyun Bae
- a Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
| | - Young Jin Ha
- b Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
| | - Chunsoo Kim
- c Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
| | - Kyu-Ri Lee
- d Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
| | - Tae Gwan Park
- e Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon 305-701, South Korea
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26
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Wang W, Shan W, Yue X, Ru H. Partitioned cooperative self-assembly process: taking the mesopore swelling strategy one step further for the preparation of mesocellular foams. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm14866h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Manet S, Lecchi A, Impéror-Clerc M, Zholobenko V, Durand D, Oliveira CLP, Pedersen JS, Grillo I, Meneau F, Rochas C. Structure of Micelles of a Nonionic Block Copolymer Determined by SANS and SAXS. J Phys Chem B 2011; 115:11318-29. [DOI: 10.1021/jp200212g] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sabine Manet
- Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France
| | - Amélie Lecchi
- Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France
| | - Marianne Impéror-Clerc
- Laboratoire de Physique de Solides, UMR 8502, Bât. 510, Université Paris-Sud, F-91405 Orsay, France
| | - Vladimir Zholobenko
- Chemistry Department, Keele University, Staffordshire, ST5 5BG, United Kingdom
| | - Dominique Durand
- Institut de Biochimie et de Biophysique Moléculaire et Cellulaire, Bât. 430, Université Paris-Sud, F-91405 Orsay, France
| | - Cristiano L. P. Oliveira
- Department of Chemistry and iNANO Interdisciplinary Nanoscience Center, Århus University, DK-8000 Århus, Denmark
| | - Jan Skov Pedersen
- Department of Chemistry and iNANO Interdisciplinary Nanoscience Center, Århus University, DK-8000 Århus, Denmark
| | | | - Florian Meneau
- SWING, Synchrotron Soleil, BP 48, F-91192 Gif-sur-Yvette, France
| | - Cyrille Rochas
- D2AM, ESRF, 6 rue Jules Horowitz, F-38000 Grenoble, France
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28
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Solubilization of Aromatic Hydrocarbons in Ethylene Oxide-Propylene Oxide Triblock Micelles: Location of Solubilizate and its Effect on Micelle Size from 2D NMR and Scattering Techniques. J SURFACTANTS DETERG 2011. [DOI: 10.1007/s11743-011-1268-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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29
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Causse J, Oberdisse J, Jestin J, Lagerge S. Small-angle neutron scattering study of solubilization of tributyl phosphate in aqueous solutions of L64 Pluronic triblock copolymers. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:15745-15753. [PMID: 20873831 DOI: 10.1021/la1021164] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
We have studied the solubilization behavior of tributylphosphate (TBP) in aqueous solutions of L64-Pluronics, using light and small angle neutron scattering (SANS). Varying the temperature and the oil content, the system presents a nontrivial phase behavior. In particular, at 308 K, a first solubilization followed by an emulsification failure and a resolubilization is found. We have measured the microstructure by SANS and characterized the microemulsion droplet core size, corona thickness, polydispersity, and interactions. It is shown that at low oil content, the system is made of small swollen micelles. After the phase separation, the resolubilization is carried by larger oil droplets decorated by copolymer. From specific surface measurements at large angles, a surprising change in surfactant conformation is found to accompany this morphological evolution which is also supported by previous results obtained from ¹H NMR experiments. In independent measurements, our structural modeling is confirmed using contrast-variation SANS.
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Affiliation(s)
- J Causse
- Institut Charles Gerhardt CNRS UMR-5253 équipe Agrégats Interfaces Matériaux pour l'Energie, Université Montpellier II, Case 015, Place E. Bataillon, 34095 Montpellier Cedex 05, France
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30
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Siliceous mesocellular foam for high-performance liquid chromatography: Effect of morphology and pore structure. J Chromatogr A 2010; 1217:4337-43. [DOI: 10.1016/j.chroma.2010.04.041] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2009] [Revised: 04/08/2010] [Accepted: 04/16/2010] [Indexed: 10/19/2022]
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31
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Deriu A, Bari MTD, Gerelli Y. Dynamics of Nanostructures for Drug Delivery: the Potential of QENS. ACTA ACUST UNITED AC 2010. [DOI: 10.1524/zpch.2010.6101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
In recent biomedical studies different nanocarrier systems have been proposed for ´smart´ drug delivery. The engineering of these systems requires as a prerequisite a detailed knowledge of their structure and dynamics at the molecular level. Quasielastic neutron scattering is an ideal tool for dynamic studies of these complex systems since it provides information on molecular motions in a time window which is important to relate the local dynamics to the macroscopic functional properties of the drug vectors. Some selected examples referring to different nanostructures will be analysed in the following.
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32
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Sharp MA, Washington C, Cosgrove T. Solubilisation of model adjuvants by Pluronic block copolymers. J Colloid Interface Sci 2010; 344:438-46. [DOI: 10.1016/j.jcis.2010.01.005] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2009] [Revised: 12/29/2009] [Accepted: 01/06/2010] [Indexed: 11/27/2022]
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33
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Lim J, Seong Lee S, Ying JY. Mesoporous silica-supported catalysts for metathesis: application to a circulating flow reactor. Chem Commun (Camb) 2009; 46:806-8. [PMID: 20087527 DOI: 10.1039/b917986k] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using click chemistry for linkage, a ruthenium-based metathesis catalyst was efficiently immobilized on nanoporous silica. The heterogenized catalyst exhibited good activity and recyclability for various substrates. An interesting application was demonstrated for a continuous process using a circulating flow reactor.
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Affiliation(s)
- Jaehong Lim
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, 138669, The Nanos, Singapore
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34
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Wan H, Liu L, Li C, Xue X, Liang X. Facile synthesis of mesoporous SBA-15 silica spheres and its application for high-performance liquid chromatography. J Colloid Interface Sci 2009; 337:420-6. [DOI: 10.1016/j.jcis.2009.05.065] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2009] [Revised: 05/25/2009] [Accepted: 05/27/2009] [Indexed: 10/20/2022]
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35
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Doe C, Jang HS, Kline SR, Choi SM. Subdomain Structures of Lamellar and Reverse Hexagonal Pluronic Ternary Systems Investigated by Small Angle Neutron Scattering. Macromolecules 2009. [DOI: 10.1021/ma802296u] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Changwoo Doe
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Republic of Korea, NIST Center for Neutron Research, Gaithersburg, Maryland 20899-6102
| | - Hyung-Sik Jang
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Republic of Korea, NIST Center for Neutron Research, Gaithersburg, Maryland 20899-6102
| | - Steven R. Kline
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Republic of Korea, NIST Center for Neutron Research, Gaithersburg, Maryland 20899-6102
| | - Sung-Min Choi
- Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon, 305-701, Republic of Korea, NIST Center for Neutron Research, Gaithersburg, Maryland 20899-6102
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36
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Gao Y, Li N, Zhang S, Zheng L, Li X, Dong B, Yu L. Organic Solvents Induce the Formation of Oil-in-Ionic Liquid Microemulsion Aggregations. J Phys Chem B 2009; 113:1389-95. [DOI: 10.1021/jp808522b] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yanan Gao
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan 250100, China
| | - Na Li
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan 250100, China
| | - Shaohua Zhang
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan 250100, China
| | - Liqiang Zheng
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan 250100, China
| | - Xinwei Li
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan 250100, China
| | - Bin Dong
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan 250100, China
| | - Li Yu
- Key Laboratory of Colloid and Interface Chemistry (Shandong University), Ministry of Education, Jinan 250100, China
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37
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Luo SC, Yu HH, Wan ACA, Han Y, Ying JY. A general synthesis for PEDOT-coated nonconductive materials and PEDOT hollow particles by aqueous chemical polymerization. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2008; 4:2051-2058. [PMID: 18949792 DOI: 10.1002/smll.200800033] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A method for coating functionalized poly(3,4-ethylenedioxythiophene) (PEDOT) on nonconductive substrates in aqueous solution allows the deposition of PEDOT thin layers on various substrates, including silica and polystyrene (PS) nanoparticles, siliceous mesocellular foam, and chitosan-alginate fibers. The surface property is tuned by controlling the monomer composition in the aqueous solutions. Using appropriate organic solvents to remove the PS cores of PEDOT-coated PS nanoparticles, hollow PEDOT particles with single holes and PEDOT capsules can be formed.
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Affiliation(s)
- Shyh-Chyang Luo
- Institute of Bioengineering and Nanotechnology, The Nanos Singapore, Singapore
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38
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Corkery RW, Fogden A. On the formation and structure of nanometric polyhedral foams: toward the dry limit. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:10443-10452. [PMID: 18710272 DOI: 10.1021/la801228x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
High surface area, high porosity, nanometric polygonal silica foams with hierarchically connected and uniformly sized pore systems are reported here. We observe a remarkable increase in foam cell sizes from mesoscopic to macroscopic dimensions upon swelling the self-assembled template with oil. The resultant structures resemble classical macroscopic soap foams and display, among other features, Plateau borders and volume fractions approaching the dry limit of 100%. In well-developed foams of this kind, dimensionally isometric polyhedral cells are connected by relatively short, flat cylindrical mesopores through polyhedral faces and micropores through the walls. For one sample, with approximately 75 nm diameter primary foam cells, we infer three separate sets of cell-connecting mesopores puncturing tetragonal, pentagonal, and hexagonal faces of the component polyhedra. A multiple step model of foam formation is discussed where an organic silica precursor progressively hydrolyzes and condenses as a growing flexible shell from the core-corona interface of oil-swollen triblock copolymer micelles or microemulsion droplets, inducing a clouding phenomena in the otherwise stabilizing poly(ethylene oxide) chains, leading to aggregation, deformation, and jamming to high volume fractions.
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Affiliation(s)
- Robert W Corkery
- Physical Chemistry 1, Center for Chemistry and Chemical Engineering, Lund University, Lund, Sweden.
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39
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Erathodiyil N, Ooi S, Seayad AM, Han Y, Lee SS, Ying JY. Palladium nanoclusters supported on propylurea-modified siliceous mesocellular foam for coupling and hydrogenation reactions. Chemistry 2008; 14:3118-25. [PMID: 18260070 DOI: 10.1002/chem.200701361] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
This paper describes the synthesis, characterization and applications of palladium (Pd) nanoparticles supported on siliceous mesocellular foam (MCF). Pd nanoparticles of 2-3 nm and 4-6 nm were used in reactions involving molecular hydrogen (such as hydrogenation of double bonds and reductive amination), transfer hydrogenation of ketones and epoxides, and coupling reactions (such as Heck and Suzuki reactions). They successfully catalyzed all these reactions with excellent yield and selectivity. This heterogeneous catalyst was easily recovered by filtration, and recycled several times without any significant loss in activity and selectivity. The palladium leaching in the reactions was determined to be much less than the FDA-approved limit of 5 ppm. Furthermore, the catalyst can be stored and handled under normal atmospheric conditions. This immobilized catalyst allows for ease of recovery/reuse and minimization of waste generation, which are of great interest in the development of green chemical processes.
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Affiliation(s)
- Nandanan Erathodiyil
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos, Singapore 138669, Singapore
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40
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41
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O'Callaghan JM, Copley MP, Hanrahan JP, Morris MA, Steytler DC, Heenan RK, Staudt R, Holmes JD. Supercritical fluid swelling of liquid crystal films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:6959-6964. [PMID: 18512872 DOI: 10.1021/la800073t] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The influence of liquid and supercritical carbon dioxide and liquid propane on the structural properties of both ionic and nonionic surfactant-based liquid crystal films is discussed in this paper. Swelling of the films, measured using in situ small-angle neutron scattering (SANS), was found to be dependent on the solubility of the propane/carbon dioxide in the micelles of the respective liquid crystals. Additionally, under certain pressure conditions the structural properties of some of the films were observed to change, ultimately leading to a loss of order in the micellar arrays of the liquid crystals.
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Affiliation(s)
- John M O'Callaghan
- Department of Chemistry, Material Section and Supercritical Fluid Centre, University College Cork, Cork, Ireland
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42
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Verma P, Nath S, Singh PK, Kumbhakar M, Pal H. Effects of Block Size of Pluronic Polymers on the Water Structure in the Corona Region and Its Effect on the Electron Transfer Reactions. J Phys Chem B 2008; 112:6363-72. [DOI: 10.1021/jp711642x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Poonam Verma
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Sukhendu Nath
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Prabhat K. Singh
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Manoj Kumbhakar
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
| | - Haridas Pal
- Radioanalytical Chemistry Section and Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
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43
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Zhang Y, Zhao L, Patra P, Ying J. Synthesis and Catalytic Applications of Mesoporous Polymer Colloids in Olefin Hydrosilylation. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200700619] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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44
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Foster T, Sottmann T, Schweins R, Strey R. Small-angle-neutron-scattering from giant water-in-oil microemulsion droplets. II. Polymer-decorated droplets in a quaternary system. J Chem Phys 2008; 128:064902. [DOI: 10.1063/1.2812564] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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45
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Foster T, Sottmann T, Schweins R, Strey R. Small-angle neutron scattering from giant water-in-oil microemulsion droplets. I. Ternary system. J Chem Phys 2008; 128:054502. [DOI: 10.1063/1.2779322] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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46
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Bharatiya B, Aswal VK, Hassan PA, Bahadur P. Influence of a hydrophobic diol on the micellar transitions of Pluronic P85 in aqueous solution. J Colloid Interface Sci 2008; 320:452-9. [PMID: 18275966 DOI: 10.1016/j.jcis.2008.01.050] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2007] [Revised: 01/29/2008] [Accepted: 01/29/2008] [Indexed: 11/30/2022]
Abstract
Micellization behavior of an amphiphilic ethylene oxide-propylene oxide-ethylene oxide tri-block copolymer Pluronic P85 [(EO)(26)(PO)(39)-(EO)(26)] in aqueous solution and in the presence of a hydrophobic C(14)diol (also known as Surfynol104) was examined by physico-chemical methods such as viscometry, cloud point (CP) and scattering techniques viz. dynamic light scattering (DLS) and small angle neutron scattering (SANS). The addition of diol decreases the cloud point and gelation temperature of aqueous Pluronic P85 copolymer solution. DLS and SANS measurements of the polymer in aqueous solution indicated micellar growth and sphere to rod transition in the presence of diol. Surfynol 104 is a sparingly water soluble diol surfactant with a solubility of approximately 0.1 wt%. However, up on addition to Pluronic solution, diol gets incorporated in the block copolymer micelles and leads to structural transition of the micelles. An increase in the temperature and the presence of added sodium chloride in the solution further enhances this effect. The addition of hydrophobic C(14)diol increases the hydrodynamic size and aggregation numbers of the micellar system. The micellar parameters for the copolymer in the presence of C(14)diol are reported at different temperatures and added sodium chloride concentrations.
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Affiliation(s)
- B Bharatiya
- Department of Chemistry, Veer Narmad South Gujarat University, Surat-395007, India.
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47
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Lim J, Lee SS, Ying JY. Silica-supported catalysts for ring-closing metathesis: effects of linker group and microenvironment on recyclability. Chem Commun (Camb) 2008:4312-4. [DOI: 10.1039/b803663b] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Ma JH, Wang Y, Guo C, Liu HZ, Tang YL, Bahadur P. Oil-Induced Aggregation of Block Copolymer in Aqueous Solution. J Phys Chem B 2007; 111:11140-8. [PMID: 17764167 DOI: 10.1021/jp073192u] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The oil-induced aggregation behavior of PEO-PPO-PEO Pluronic P84 [(EO)19(PO)39(EO)19] in aqueous solutions has been systematically investigated by 1H NMR spectroscopy, freeze-fracture transmission electron microscopy (FF-TEM), and dynamic light scattering (DLS). The critical micellization temperature (CMT) for P84 in the presence of oils decreases with increasing oil concentration. The effectiveness of various oils in decreasing the CMT of block copolymer follows the order m-xylene (C(8)H(10)) > toluene (C(7)H(8)) > benzene (C(6)H(6)) > n-octane (C(8)H(18)) > n-hexane (C(6)H(14)) approximately cyclohexane (C(6)H(12)). It was found that the amount of anhydrous PO methyl groups increases whereas the amount of hydrated PO methyl groups decreases upon the addition of oils. At low oil concentration, the oil molecules are entrapped by the micellar core, but as the oil concentration increases above a certain value, the micellar core swells significantly as a result of the penetrated oil molecules, and much larger aggregates are formed. Intermolecular rotating-frame nuclear Overhauser effect (ROE) measurements between P84 and benzene were performed at 10 and 40 degrees C. The specific interaction between benzene and the methyl groups of PPO was determined, and it was observed that the interaction site remained unchanged as the temperature was increased.
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Affiliation(s)
- Jun-He Ma
- Laboratory of Separation Science and Engineering, State Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Graduate University of Chinese Academy of Sciences, Beijing 100080, PR China
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Lutter S, Tiersch B, Koetz J, Boschetti-de-Fierro A, Abetz V. Covalently closed microemulsions in presence of triblock terpolymers. J Colloid Interface Sci 2007; 311:447-55. [PMID: 17448486 DOI: 10.1016/j.jcis.2007.03.034] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2006] [Revised: 02/20/2007] [Accepted: 03/19/2007] [Indexed: 11/20/2022]
Abstract
This paper is focused on the influence of polystyrene (PS)-poly(1,4-butadiene) (PB)-poly(ethylene oxide) (PEO) triblock terpolymers on the w/o microemulsion of the pseudo-ternary system water/sodium dodecylsulfate (SDS)/xylene-pentanol. Despite the insolubility of the copolymer in water as well as in the xylene-pentanol mixture, it can be incorporated into the w/o microemulsion and interactions between the triblock terpolymer molecules and the anionic surfactant headgroups can be detected by differential scanning calorimetry (DSC) measurements. Furthermore, dynamic light scattering measurements were used to determine the aggregate diameter of the modified microemulsions. For lower polymer concentrations large aggregates between 100 and 500 nm can be observed. Surprisingly, at a higher terpolymer concentration of 5 wt%, significant smaller aggregate diameters can be identified by dynamic light scattering and Cryo-SEM. One can conclude that the copolymers are incorporated in the inverse microemulsion droplets, where the PB blocks cover the water droplets. The thermally induced radical cross-linking of the butadiene units in the presence of azobisisobutyronitrile (AIBN) leads then to covalently closed nanocapsules with an average size of 10 nm.
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Affiliation(s)
- Stefanie Lutter
- Universität Potsdam, Institut für Chemie, Karl-Liebknecht-Strasse 24-25, Haus 25, 14476 Potsdam (Golm), Germany
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Behjatmanesh-Ardakani R, Nikfetrat M. Study of Winsor I to Winsor II Transitions in a Lattice Model. J Phys Chem B 2007; 111:7169-75. [PMID: 17552556 DOI: 10.1021/jp070752g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Experiments show that with increasing temperature, microemulsion systems undergo Winsor transitions. The transitions occur from Winsor I (oil droplets in water media) to Winsor II (water droplets in oil media) via Winsor III (bicontinuous phase) with an increase in the temperature. In this paper, it has been shown, for the first time, how one can study the qualitative effects of temperature, head, tail, and oil chain lengths, on these transitions. Simple cubic lattice with excluded volume and periodic boundary conditions is used to mimic the box of the simulation as a bulk of solution. The simulations have been done using the standard traditional Metropolis algorithm in the canonical ensemble (N, V, T). Configurational bias Monte Carlo and reptation moves are used with an equal probability to relax the systems. A very simple interaction model, i.e., the repulsions of water (or heads of surfactants) with oil (or tails of surfactants), is used due to the main characteristic of oil-water mixtures or amphiphilic molecule that is the hydrophobicity. The interfacial tension between oil and water (gammaow) is related to the averaged total energy of the lattice. The model shows that the Winsor III has a minimum interfacial tension (gammaow) similar to experimental results. Changing the phase structure from Winsor III to Winsor I (or Winsor II), increases the interfacial tension which is in agreement with experiments. To relate interfacial tension with the interaction parameter, the simple theory of Bragg-Williams has been used. All of the results such as the effects of oil chain length, head and tail beads number are all similar to the experimental results. Using the Davies method for calculating hydrophilic-lypophilic Balance (HLB), similar to the experimental results, Winsor III phase is formed at HLB value nearly to 10.
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