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221. Surfactant-Free Emulsions with Erasable Triggered Phase Inversions

Author:
Chen, Yiwen; Wang, Zhen; Wang, Dingguan; Ma, Ning; Li, Cancan; Wang, Yapei
Source:
Langmuir 2016 v.32 no.42 pp. 11039-11042
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; composite polymers; emulsifying; emulsions; surfactants;     Show all 5 Subjects
Abstract:
... Complex emulsions including double emulsions and high-internal-phase emulsions (HIPEs) are wonderful templates for producing porous polymeric materials. Yet, surfactants and multiple emulsifications are generally needed. In this work, surfactant-free complex emulsions are successfully prepared using a CO₂-responsive block copolymer through one-step emulsification. Phase inversion from HIPEs to dou ...
DOI:
10.1021/acs.langmuir.6b03189

222. Swelling of Poly(n-butyl methacrylate) Films Exposed to Supercritical Carbon Dioxide: A Comparative Study with Polystyrene

Author:
Bal, Jayanta Kumar; Beuvier, Thomas; Vignaud, Guillaume; Chebil, Mohamed Souheib; Ben-Jabrallah, Soumaya; Ahmed, Ikbal; Grohens, Yves; Gibaud, Alain
Source:
Langmuir 2016 v.32 no.7 pp. 1716-1722
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; X-radiation; chemical interactions; glass transition temperature; polystyrenes;     Show all 5 Subjects
Abstract:
... We report here the swelling and relaxation properties of confined poly(n-butyl methacrylate) (PBMA) films having thicknesses of less than 70 nm under supercritical carbon dioxide (scCO₂) using the X-ray reflectivity technique. Swellability is found to be dominant in thinner films compared to thicker ones as a consequence of the confinement-induced densification of the former. Swellability is propo ...
DOI:
10.1021/acs.langmuir.5b04436

223. Switchable Oil-in-Water Emulsions Stabilized by Like-Charged Surfactants and Particles at Very Low Concentrations

Author:
Xu, Maodong; Xu, Lifei; Lin, Qi; Pei, Xiaomei; Jiang, Jianzhong; Zhu, Haiyan; Cui, Zhenggang; Binks, Bernard P.
Source:
Langmuir 2019 v.35 no.11 pp. 4058-4067
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; aluminum oxide; desorption; droplets; emulsions; homogenization; nanoparticles; nitrogen; oil-water interface; oils; surfactants; zeta potential;     Show all 12 Subjects
Abstract:
... A novel CO₂/N₂ switchable n-decane-in-water emulsion was prepared, which is stabilized by a CO₂/N₂ switchable surfactant [N′-dodecyl-N,N-dimethylacetamidine (DDMA)] in cationic form in combination with positively charged alumina nanoparticles at concentrations as low as 0.01 mM and 0.001 wt %, respectively. The particles do not adsorb at the oil–water interface but remain dispersed in the aqueous ...
DOI:
10.1021/acs.langmuir.8b04159

224. Switchable Surfactants for the Preparation of Monodisperse, Supported Nanoparticle Catalysts

Author:
Bryant, Kristin; Ibrahim, Gasim; Saunders, Steven R.
Source:
Langmuir 2017 v.33 no.45 pp. 12982-12988
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; active sites; alkanes; catalysts; catalytic activity; hydrogenation; ligands; nanogold; nanoparticles; p-nitrophenol; solvents; surface area; surfactants;     Show all 13 Subjects
Abstract:
... Synthesis methods for the preparation of monodisperse, supported nanoparticles remain problematic. Traditional synthesis methods require calcination following nanoparticle deposition to remove bound ligands and expose catalytic active sites. Calcination leads to significant and unpredictable growth of the nanoparticles resulting in polydisperse size populations. This undesired increase in nanopart ...
DOI:
10.1021/acs.langmuir.7b02983

225. Switching the Reaction Course of Electrochemical CO2 Reduction with Ionic Liquids

Author:
Sun, Liyuan; Ramesha, Ganganahalli K.; Kamat, Prashant V.; Brennecke, Joan F.
Source:
Langmuir 2014 v.30 no.21 pp. 6302-6308
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; acetonitrile; carbon monoxide; chemical bonding; electrochemistry; electrodes; electrolytes; ionic liquids; lead; oxalates; perchlorates; tetraethylammonium compounds;     Show all 12 Subjects
Abstract:
... The ionic liquid 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([emim][Tf₂N]) offers new ways to modulate the electrochemical reduction of carbon dioxide. [emim][Tf₂N], when present as the supporting electrolyte in acetonitrile, decreases the reduction overpotential at a Pb electrode by 0.18 V as compared to tetraethylammonium perchlorate as the supporting electrolyte. More interes ...
DOI:
10.1021/la5009076

226. Synergistic Effects in Nanoengineered HNb3O8/Graphene Hybrids with Improved Photocatalytic Conversion Ability of CO2 into Renewable Fuels

Author:
Liu, He; Zhang, Haitao; Shen, Peng; Chen, Feixiong; Zhang, Suojiang
Source:
Langmuir 2016 v.32 no.1 pp. 254-264
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; energy; graphene; microstructure; nanosheets; photocatalysis; powders; renewable energy sources; surface area; synergism;     Show all 10 Subjects
Abstract:
... Layered HNb₃O₈/graphene hybrids with numerous heterogeneous interfaces and hierarchical pores were fabricated via the reorganization of exfoliated HNb₃O₈ nanosheets with graphene nanosheets (GNs). Numerous interfaces and pores were created by the alternative stacking of HNb₃O₈ nanosheets with limited size and GNs with a buckling and folding feature. The photocatalytic conversation of CO₂ into rene ...
DOI:
10.1021/acs.langmuir.5b03359

227. Synthesis of Core–Shell Structured Porous Nitrogen-Doped Carbon@Silica Material via a Sol–Gel Method

Author:
Xiao, Pei-Wen; Zhao, Li; Sui, Zhu-Yin; Han, Bao-Hang
Source:
Langmuir 2017 v.33 no.24 pp. 6038-6045
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; X-ray photoelectron spectroscopy; adsorption; air; carbon; composite polymers; nitrogen; silica; sol-gel processing; surface area; synergism;     Show all 11 Subjects
Abstract:
... Core–shell structured nitrogen-doped porous carbon@silica material with uniform structure and morphology was synthesized via a sol–gel method. During this process, a commercial triblock copolymer and the in situ formed pyrrole-formaldehyde polymer acted as cotemplates, while tetraethyl orthosilicate acted as silica precursor. The synergetic effect of the triblock copolymer and the pyrrole-formalde ...
DOI:
10.1021/acs.langmuir.7b00331

228. Textural Characterization of Micro- and Mesoporous Carbons Using Combined Gas Adsorption and n-Nonane Preadsorption

Author:
Oschatz, Martin; Borchardt, Lars; Rico-Francés, Soledad; Rodríguez-Reinoso, Francisco; Kaskel, Stefan; Silvestre-Albero, Joaquín
Source:
Langmuir 2013 v.29 no.25 pp. 8133-8139
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; adsorption; carbon; chlorine; methodology; micropores; nitrogen; porosity; porous media; silicon; silicon carbide;     Show all 11 Subjects
Abstract:
... Porous carbon and carbide materials with different structures were characterized using adsorption of nitrogen at 77.4 K before and after preadsorption of n-nonane. The selective blocking of the microporosity with n-nonane shows that ordered mesoporous silicon carbide material (OM-SiC) is almost exclusively mesoporous whereas the ordered mesoporous carbon CMK-3 contains a significant amount of micr ...
DOI:
10.1021/la401206u

229. The Evolution of the Polycrystalline Copper Surface, First to Cu(111) and Then to Cu(100), at a Fixed CO2RR Potential: A Study by Operando EC-STM

Author:
Kim, Youn-Geun; Baricuatro, Jack Hess; Javier, Alnald; Gregoire, John Mathew; Soriaga, Manuel P.
Source:
Langmuir 2014 v.30 no.50 pp. 15053-15056
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; copper; electrochemistry; electrodes; potassium hydroxide; scanning tunneling microscopy;     Show all 6 Subjects
Abstract:
... A study based on operando electrochemical scanning tunneling microscopy (EC-STM) has shown that a polycrystalline Cu electrode held at a fixed negative potential, −0.9 V (vs SHE), in the vicinity of CO₂ reduction reactions (CO₂RR) in 0.1 M KOH, undergoes stepwise surface reconstruction, first to Cu(111) within 30 min, and then to Cu(100) after another 30 min; no further surface transformations occ ...
DOI:
10.1021/la504445g

230. Theoretical Determination of Band Edge Alignments at the Water–CuInS2(112) Semiconductor Interface

Author:
Senftle, Thomas P.; Carter, Emily A.
Source:
Langmuir 2017 v.33 no.37 pp. 9479-9489
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; electrodes; electrolytes; electrons; methanol; methodology; photocatalysis; semiconductors; solvents;     Show all 9 Subjects
Abstract:
... Knowledge of a semiconductor electrode’s band edge alignment is essential for optimizing processes that occur at the semiconductor/electrolyte interface. Photocatalytic processes are particularly sensitive to such alignments, as they govern the transfer of photoexcited electrons or holes from the surface to reactants in the electrolyte solution. Reconstructions of a semiconductor surface during op ...
DOI:
10.1021/acs.langmuir.7b00668

231. Theoretical Investigations of CO2 and CH4 Sorption in an Interpenetrated Diamondoid Metal–Organic Material

Author:
Pham, Tony; Forrest, Katherine A.; Tudor, Brant; Elsaidi, Sameh K.; Mohamed, Mona H.; McLaughlin, Keith; Cioce, Christian R.; Zaworotko, Michael J.; Space, Brian
Source:
Langmuir 2014 v.30 no.22 pp. 6454-6462
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; adsorption; binding sites; cobalt; heat; hydrophobicity; ions; methane; porosity; sorbates; sorption isotherms;     Show all 11 Subjects
Abstract:
... Grand canonical Monte Carlo (GCMC) simulations of CO₂ and CH₄ sorption and separation were performed in dia-7i-1-Co, a metal–organic material (MOM) consisting of a 7-fold interpenetrated net of Co²⁺ ions coordinated to 4-(2-(4-pyridyl)ethenyl)benzoate linkers. This MOM shows high affinity toward CH₄ at low loading due to the presence of narrow, close fitting, one-dimensional hydrophobic channelst ...
DOI:
10.1021/la500967w
PubMed:
24835550
PubMed Central:
PMC4055056

232. Theoretical Investigations of CO2 and H2 Sorption in Robust Molecular Porous Materials

Author:
Pham, Tony; Forrest, Katherine A.; Chen, Kai-Jie; Kumar, Amrit; Zaworotko, Michael J.; Space, Brian
Source:
Langmuir 2016 v.32 no.44 pp. 11492-11505
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; adenine; adsorption; chlorides; chlorine; coordination polymers; heat; hydrogen; ions; models; sorption isotherms;     Show all 11 Subjects
Abstract:
... Molecular simulations of CO₂ and H₂ sorption were performed in MPM-1-Cl and MPM-1-TIFSIX, two robust molecular porous materials (MPMs) with the empirical formula [Cu₂(adenine)₄Cl₂]Cl₂ and [Cu₂(adenine)₄(TiF₆)₂], respectively. Recent experimental studies have shown that MPM-1-TIFSIX displayed higher CO₂ uptake and isosteric heat of adsorption (Qₛₜ) than MPM-1-Cl [Nugent, P. S.; et al. J. Am. Chem. ...
DOI:
10.1021/acs.langmuir.6b03161

233. Theoretical Study on Molten Alkali Carbonate Interfaces

Author:
Gutiérrez, Alberto; Garroni, Sebastiano; Souentie, Stamatios; Cuesta-López, Santiago; Yakoumis, Iakovos; Aparicio, Santiago
Source:
Langmuir 2018 v.34 no.43 pp. 13065-13076
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; adsorption; carbonates; flue gas; graphene; lithium; models; molecular dynamics; nitrogen; potassium; sodium;     Show all 11 Subjects
Abstract:
... The properties and structure of relevant interfaces involving molten alkali carbonates are studied using molecular dynamics simulation. Lithium carbonate and the Li/Na/K carbonate eutectic mixture are considered. Gas phases composed of pure CO₂ or a model flue gas mixture are analyzed. Similarly, the adsorption of these gas phases on graphene are studied, showing competitive CO₂ and N₂ adsorption ...
DOI:
10.1021/acs.langmuir.8b02907

234. Thermochemical Analysis of Molybdenum Thin Films on Porous Alumina

Author:
Lee, Kyoungjin; de Lannoy, Charles-François; Liguori, Simona; Wilcox, Jennifer
Source:
Langmuir 2017 v.33 no.38 pp. 9521-9529
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; X-ray photoelectron spectroscopy; aluminum oxide; carbon; evaporation; gases; molybdenum; nitrogen; oxidation; thermal stability;     Show all 10 Subjects
Abstract:
... Molybdenum (Mo) thin films (thickness <100 nm) were physically deposited by e-beam evaporation on a porous alumina substrate and were analyzed for their stability and reactivity under various thermal and gas conditions. The Mo thin-film composites were stable below 300 °C but had no reactivity toward gases. Mo thin films showed nitrogen incorporation on the surface as well as in the subsurface at ...
DOI:
10.1021/acs.langmuir.6b04149

235. Thermodynamic Resistance to Matter Flow at The Interface of a Porous Membrane

Author:
Glavatskiy, K. S.; Bhatia, Suresh K.
Source:
Langmuir 2016 v.32 no.14 pp. 3400-3411
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; carbon nanotubes; fuel cells; hydrodynamics; methane; nanopores; thermodynamics;     Show all 7 Subjects
Abstract:
... Nanoporous materials are important in industrial separation, but their application is subject to strong interfacial barriers to the entry and transport of fluids. At certain conditions the fluid inside and outside the nanoporous material can be viewed as a two-phase system, with an interface between them, which poses an excess resistance to matter flow. We show that there exist two kinds of phenom ...
DOI:
10.1021/acs.langmuir.6b00375

236. Transport Diffusion of Light Gases in Polyethylene Using Atomistic Simulations

Author:
Dutta, Ravi C.; Bhatia, Suresh K.
Source:
Langmuir 2017 v.33 no.4 pp. 936-946
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; activation energy; adsorption; gases; methane; models; molecular dynamics; nitrogen; polyethylene; porosity; solubility; sorption isotherms; temperature;     Show all 13 Subjects
Abstract:
... We explore the temperature dependence of the self-, corrected-, and transport-diffusivities of CO₂, CH₄, and N₂ in a polyethylene (PE) polymer membrane through equilibrium molecular dynamics simulations. We also investigate the morphology of the polymer membrane based on the intermolecular radial distribution function, free volume, and pore size distribution analysis. The results indicate the exis ...
DOI:
10.1021/acs.langmuir.6b04037

237. Tunable Polymer Microcapsules for Controlled Release of Therapeutic Gases

Author:
Seekell, Raymond P.; Peng, Yifeng; Lock, Andrew T.; Kheir, John N.; Polizzotti, Brian D.
Source:
Langmuir 2018 v.34 no.31 pp. 9175-9183
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; encapsulation; gases; oxygen; polymers; separation; therapeutics;     Show all 7 Subjects
Abstract:
... Encapsulation and delivery of oxygen, carbon dioxide, and other therapeutic gases, using polymeric microcapsules (PMCs) is an emerging strategy to deliver gas as an injectable therapeutic. The gas cargo is stored within the PMC core and its release is mediated by the physiochemical properties of the capsule shell. Although use of PMCs for the rapid delivery of gases has been well described, method ...
DOI:
10.1021/acs.langmuir.8b01328

238. Tuning Both Surface Chemistry and Porous Properties of Polymer-Derived Porous Carbons for High-Performance Gas Adsorption

Author:
Liu, Shan; Sui, Zhu-Yin; Wang, Tian-Xiong; Zhou, Hang-Yu; Liu, Yu-Wen; Han, Bao-Hang
Source:
Langmuir 2019 v.35 no.24 pp. 7650-7658
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; X-ray photoelectron spectroscopy; adsorbents; adsorption; catalysts; ethanol; formaldehyde; hydrochloric acid; nitrogen; nitrogen content; polymerization; polymers; pyrroles; scanning electron microscopy; solvents; temperature;     Show all 16 Subjects
Abstract:
... In this study, we have prepared novel pyrrole–formaldehyde polymers through polymerizing pyrrole and formaldehyde in the mixture solvent of water and ethanol by using hydrochloric acid as a catalyst. The as-synthesized polymers possess a nitrogen content of 6.7 atom % and are composed of spherical particles with the diameter of approximately 1–3 μm. A series of nitrogen-doped porous carbons with h ...
DOI:
10.1021/acs.langmuir.9b00147

239. Tuning Micellar Structures in Supercritical CO2 Using Surfactant and Amphiphile Mixtures

Author:
Peach, Jocelyn; Czajka, Adam; Hazell, Gavin; Hill, Christopher; Mohamed, Azmi; Pegg, Jonathan C.; Rogers, Sarah E.; Eastoe, Julian
Source:
Langmuir 2017 v.33 no.10 pp. 2655-2663
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; micelles; neutrons; sodium; surfactants; viscosity; water content;     Show all 7 Subjects
Abstract:
... For equivalent micellar volume fraction (ϕ), systems containing anisotropic micelles are generally more viscous than those comprising spherical micelles. Many surfactants used in water-in-CO₂ (w/c) microemulsions are fluorinated analogues of sodium bis(2-ethylhexyl) sulfosuccinate (AOT): here it is proposed that mixtures of CO₂-philic surfactants with hydrotropes and cosurfactants may generate elo ...
DOI:
10.1021/acs.langmuir.7b00324

240. Tuning Smart Microgel Swelling and Responsive Behavior through Strong and Weak Polyelectrolyte Pair Assembly

Author:
Costa, Eunice; Lloyd, Margaret M.; Chopko, Caroline; Aguiar-Ricardo, Ana; Hammond, Paula T.
Source:
Langmuir 2012 v.28 no.26 pp. 10082-10090
ISSN:
1520-5827
Subject:
carbon dioxide,   etc   ; Fourier transform infrared spectroscopy; cations; chlorides; crosslinking; gels; glutamic acid; hydrogen bonding; ionic strength; lysine; microbeads; permeability; polyacrylic acid; sodium; styrene; temperature;     Show all 16 Subjects
Abstract:
... The layer-by-layer (LbL) assembly of polyelectrolyte pairs on temperature and pH-sensitive cross-linked poly(N-isopropylacrylamide)-co-(methacrylic acid), poly(NIPAAm-co-MAA), microgels enabled a fine-tuning of the gel swelling and responsive behavior according to the mobility of the assembled polyelectrolyte (PE) pair and the composition of the outermost layer. Microbeads with well-defined morpho ...
DOI:
10.1021/la301586t
PubMed:
22676290
PubMed Central:
PMC3412153