U.S. flag

An official website of the United States government

PubAg

Main content area

You searched for: Journal Langmuir Remove constraint Journal: Langmuir Publication Year 2019 Remove constraint Publication Year: 2019 Source 2019 v.35 no.12 Remove constraint Source: 2019 v.35 no.12
Start Over

Search

23  Search Results

« Previous | 1 - 20 of 23 |
Number of results to display per page

Search Results

1. Microbubbles and Oil Droplets Stabilized by a Class II Hydrophobin in Marinelike Environments

Author:
Zhang, Xujun; Blalock, Bradford; Huberty, Wayne; Chen, Yuwu; Hung, Francisco; Russo, Paul S.
Source:
Langmuir 2019 v.35 no.12 pp. 4380-4386
ISSN:
1520-5827
Subject:
acids; ceratoulmin; chemical bases; cleaning; copper nanoparticles; cyclohexanes; dispersants; droplets; fungi; gases; hydrodynamics; hydrophobins; light scattering; microbubbles; oil spills; oils; seawater; solvents; surfactants
Abstract:
... Hydrophobins are abundant amphipathic proteins produced by fungi. They have been interacting with oils in natural environments for millions of years; therefore, it is sensible to consider them as surfactants and dispersants for cleaning oil spills. To better understand the properties of these amphipathic proteins in seawater, a particular hydrophobin known as cerato-ulmin (CU; mass 7627 g/mol) was ...
DOI:
10.1021/acs.langmuir.8b03777

2. Characterization of Ultrathin Polymer Films Using p-Polarized ATR-FTIR and Its Comparison with XPS

Author:
Luan, Pingshan; Oehrlein, Gottlieb S.
Source:
Langmuir 2019 v.35 no.12 pp. 4270-4277
ISSN:
1520-5827
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; chemical analysis; chemical bonding; elemental composition; films (materials); moieties; polystyrenes
Abstract:
... We report on the chemical analysis of ultrathin (10 nm) polymer films using the attenuated total reflectance–Fourier transform infrared (ATR-FTIR) technique based on p-polarized infrared light and two types of enhancing substrates, that is, metallic (Au) and dielectric (Si). We selected low-temperature plasma-treated ∼10 nm thick polystyrene films as a test case for demonstrating the capability of ...
DOI:
10.1021/acs.langmuir.9b00316

3. Dynamic Adsorption of Ions into Like-Charged Nanospace: A Dynamic Density Functional Theory Study

Author:
Qing, Leying; Li, Yu; Tang, Weiqiang; Zhang, Duo; Han, Yongsheng; Zhao, Shuangliang
Source:
Langmuir 2019 v.35 no.12 pp. 4254-4262
ISSN:
1520-5827
Subject:
adsorption; density functional theory; equations; ions; nanopores; porosity; porous media; prediction; theoretical models
Abstract:
... The adsorption processes of ions into charged nanospace are associated with many practical applications. Whereas a large number of microporous materials have been prepared toward efficient adsorption of ions from solutions, theoretical models that allow for capturing the characteristics of ion dynamic adsorption into like-charged nanopores are still few. The difficulty originates from the overlapp ...
DOI:
10.1021/acs.langmuir.9b00088

4. Microgel Particles at Interfaces: Phenomena, Principles, and Opportunities in Food Sciences

Author:
Kwok, Man-hin; Sun, Guanqing; Ngai, To
Source:
Langmuir 2019 v.35 no.12 pp. 4205-4217
ISSN:
1520-5827
Subject:
adsorption; catalytic activity; emulsions; environmental factors; food science; industrial applications; microgels; nanoparticles; oil-water interface; oils; pH; rheological properties; surface tension
Abstract:
... The use of soft microgel particles for stabilizing emulsions has captured increasing attention across a wide range of disciplines in the past decades. Being soft, the nanoparticles, which are spherical in solution, undergo a structure change when adsorbed at the oil–water interface. This morphology change leads to the special dynamic properties of interface layers and packing structures, which the ...
DOI:
10.1021/acs.langmuir.8b04009

5. Effect of Low-Concentration of 1-Pentanol on the Wettability of Petroleum Fluid–Brine–Rock Systems

Author:
Lu, Yingda; Najafabadi, Nariman Fathi; Firoozabadi, Abbas
Source:
Langmuir 2019 v.35 no.12 pp. 4263-4269
ISSN:
1520-5827
Subject:
calcite; carbonates; contact angle; mica; oils; pentanols; petroleum; quartz; sandstone; sodium chloride; synergism; wettability; zeta potential
Abstract:
... High-concentration brines generally cause the wettability of petroleum fluid–brine–rock systems to become less water-wet (more oil-wet). The addition of alcohols to the brine, however, may produce an opposite effect. In this work, we investigate the synergic effects of a low concentration of 1-pentanol and brines on the wettability of petroleum fluid–brine–rock systems. The variables examined incl ...
DOI:
10.1021/acs.langmuir.9b00099

6. Solid–Liquid–Liquid Wettability of Surfactant–Oil–Water Systems and Its Prediction around the Phase Inversion Point

Author:
Stammitti-Scarpone, Aurelio; Acosta, Edgar J.
Source:
Langmuir 2019 v.35 no.12 pp. 4305-4318
ISSN:
1520-5827
Subject:
Gibbs free energy; cleaning; contact angle; emulsions; energy; equations; glass; mica; models; oils; polytetrafluoroethylene; prediction; sodium; stainless steel; surface tension; surfactants; wettability
Abstract:
... Surfactant–oil–water (SOW) systems are important for numerous applications, including hard surface cleaning, detergency, and enhanced oil-recovery applications. There is limited literature on the wettability of solid–liquid–liquid (SLL) systems around the surfactant phase inversion point (PIP), and the few references that exist point to wettability inversion accompanying the microemulsion (μE) pha ...
DOI:
10.1021/acs.langmuir.8b03907

7. Trapping of Gas Bubbles in Water at a Finite Distance below a Water–Solid Interface

Author:
Esteso, V.; Carretero-Palacios, S.; Thiyam, P.; Míguez, H.; Parsons, D. F.; Brevik, I.; Boström, M.
Source:
Langmuir 2019 v.35 no.12 pp. 4218-4223
ISSN:
1520-5827
Subject:
adsorption; aluminum; bubbles; gold; hydrodynamics; models; polystyrenes; sand; silica; silver
Abstract:
... Gas bubbles in a water-filled cavity move upward because of buoyancy. Near the roof, additional forces come into play, such as Lifshitz, double layer, and hydrodynamic forces. Below uncharged metallic surfaces, repulsive Lifshitz forces combined with buoyancy forces provide a way to trap micrometer-sized bubbles. We demonstrate how bubbles of this size can be stably trapped at experimentally acces ...
DOI:
10.1021/acs.langmuir.8b04176

8. Biofouling Control Using Nano Silicon Dioxide Reinforced Mixed-Charged Zwitterionic Hydrogel in Aquaculture Cage Nets

Author:
Mohan, Ahana; Ashraf, P. Muhamed
Source:
Langmuir 2019 v.35 no.12 pp. 4328-4335
ISSN:
1520-5827
Subject:
Fourier transform infrared spectroscopy; antifouling agents; biofouling; coatings; composite polymers; estuaries; hydrogels; hydrogen; hydrophilicity; polyethylene; scanning electron microscopy; zwitterions
Abstract:
... Biofouling in aquaculture cages negatively affects the farm productivity, and it requires huge sums of money and labor for its management. A superhydrophilic pseudozwitterionic hydrogel, N-isopropylacrylamide (NIPA) + [2-(methacryloyloxy)ethyl]trimethylammonium (TMA) + 3-sulfopropyl methacrylate (SA) copolymer, is considered as a potential antifouling agent. The present study aimed to synthesize a ...
DOI:
10.1021/acs.langmuir.8b04071

9. Bulk Nanobubbles Fabricated by Repeated Compression of Microbubbles

Author:
Jin, Juan; Feng, Zhenqiang; Yang, Fang; Gu, Ning
Source:
Langmuir 2019 v.35 no.12 pp. 4238-4245
ISSN:
1520-5827
Subject:
Fourier transform infrared spectroscopy; aqueous solutions; hydrogen bonding; light microscopy; microbubbles; nanobubbles; reflectance; sulfur hexafluoride; zeta potential
Abstract:
... Nanobubbles (NBs), given its extraordinary properties, have drawn keen attention in the field of nanotechnology worldwide. However, compared to that of surface NBs, generation of stable bulk NBs remains an arduous task with the prevailing method. In this study, we developed a pressure-driven method to prepare bulk NBs by repeatedly compressing sulfur hexafluoride (SF₆) gas into water. The results ...
DOI:
10.1021/acs.langmuir.8b04314

10. Characterization of Sample Loss Caused by Competitive Adsorption of Proteins in Vials Using Sodium Dodecyl Sulfate–Polyacrylamide Gel Electrophoresis

Author:
Ranade, Ameya V; Mukhtarov, Rustam; An Liu, Ken Jia; Behrner, Melissa A.; Sun, Bingyun
Source:
Langmuir 2019 v.35 no.12 pp. 4224-4232
ISSN:
1520-5827
Subject:
EDTA (chelating agent); adsorption; milk proteins; polyacrylamide gel electrophoresis; silver staining
Abstract:
... Sample loss caused by competitive protein adsorption on solid surfaces from complex samples remains to be a major hurdle in sensitive analyses of proteins. No label-free techniques can easily quantify individual proteins adsorbed on irregular surfaces of Eppendorf vials or Falcon tubes, which are commonly used to contain complex biological samples. Multiplexed characterization of such adsorption b ...
DOI:
10.1021/acs.langmuir.8b04281

11. Zwitterionic Polydopamine-Coated Manganese Oxide Nanoparticles with Ultrahigh Longitudinal Relaxivity for Tumor-Targeted MR Imaging

Author:
Wang, Peng; Xu, Xiaoying; Wang, Yue; Zhou, Benqing; Qu, Jiao; Li, Jin; Shen, Mingwu; Xia, Jindong; Shi, Xiangyang
Source:
Langmuir 2019 v.35 no.12 pp. 4336-4341
ISSN:
1520-5827
Subject:
dispersibility; folic acid; image analysis; ligands; lysine; magnetic resonance imaging; magnetism; manganese oxides; nanoparticles; neoplasms; rhodamines; zwitterions
Abstract:
... We present the design of antifouling zwitterion-functionalized manganese oxide (Mn₃O₄) nanoparticles (NPs) modified with folic acid (FA) for targeted tumor magnetic resonance (MR) imaging. In the current work, diethylene glycol-stabilized Mn₃O₄ NPs were initially prepared via a solvothermal approach, coated with polydopamine (PDA), fluorescently labeled with rhodamine B, conjugated with FA via ami ...
DOI:
10.1021/acs.langmuir.9b00013

12. Zwitterionic Surfactant Micelle-Directed Self-Assembly of Eu-Containing Polyoxometalate into Organized Nanobelts with Improved Emission and pH Responsiveness

Author:
Lei, Nana; Feng, Lei; Chen, Xiao
Source:
Langmuir 2019 v.35 no.12 pp. 4370-4379
ISSN:
1520-5827
Subject:
aqueous solutions; electrostatic interactions; hydrogen bonding; hydrophobic bonding; luminescence; micelles; models; pH; protonation; surfactants; zwitterions
Abstract:
... Recently, hybrid coassembly between polyoxometalates (POMs) and cationic building blocks provides an efficient strategy to greatly optimize POMs’ functionality as well as their aggregate structural diversity. Adaptive hybrid supramolecular materials with enhanced luminescence have then been obtained from lanthanide-containing POMs. In this work, a commercially available and pH-switchable zwitterio ...
DOI:
10.1021/acs.langmuir.9b00261

13. DBHP-Functionalized ZnO Nanoparticles with Improved Antioxidant Properties as Lubricant Additives

Author:
Huang, Lina; Zhou, Changhua; Zhang, Yujuan; Zhang, Shengmao; Zhang, Pingyu
Source:
Langmuir 2019 v.35 no.12 pp. 4342-4352
ISSN:
1520-5827
Subject:
activation energy; additives; antioxidant activity; antioxidants; differential scanning calorimetry; dispersibility; equations; half life; lubricants; lubrication; nanocomposites; nanoparticles; oils; oxidation; oxygen; phenol; propionic acid; temperature; thermal stability; thermogravimetry; zinc; zinc oxide
Abstract:
... In this article, 3-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid (DBHP)-functionalized ZnO (DBHP–ZnO) nanoparticles were synthesized by decomposing the organometallic precursor Zn(DBHP)₂ under alkaline conditions. This in situ surface modification method can induce small-sized ZnO nanoparticles (5 nm) and form strong linkage between DBHP and ZnO nanoparticles. DBHP as an organic compound hind ...
DOI:
10.1021/acs.langmuir.9b00093

14. Shape-Selective Electroless Plating within Expanding Template Pores: Etching-Assisted Deposition of Spiky Nickel Nanotube Networks

Author:
Boettcher, Tim; Schaefer, Sandra; Antoni, Markus; Stohr, Tobias; Kunz, Ulrike; Dürrschnabel, Michael; Molina-Luna, Leopoldo; Ensinger, Wolfgang; Muench, Falk
Source:
Langmuir 2019 v.35 no.12 pp. 4246-4253
ISSN:
1520-5827
Subject:
catalytic activity; crystal structure; electron microscopy; hydrazine; nanoparticles; nanotubes; nickel; polymers; reducing agents
Abstract:
... Nano-objects are favored structures for applications such as catalysis and sensing. Although they already provide a large surface-to-volume ratio, this ratio can be further increased by shape-selective plating of the nanostructure surfaces. This process combines the conformity of autocatalytic deposition with the defined nucleation and growth characteristics of colloidal nanoparticle syntheses. Ho ...
DOI:
10.1021/acs.langmuir.9b00030

15. Control of Stratification in Drying Particle Suspensions via Temperature Gradients

Author:
Tang, Yanfei; Grest, Gary S.; Cheng, Shengfeng
Source:
Langmuir 2019 v.35 no.12 pp. 4296-4304
ISSN:
1520-5827
Subject:
cooling; drying; evaporation; liquid-air interface; molecular dynamics; nanoparticles; prediction; simulation models; solvents; temperature profiles; vapors
Abstract:
... A potential strategy for controlling stratification in a drying suspension of bidisperse particles is studied using molecular dynamics simulations. When the suspension is maintained at a constant temperature during fast drying, it can exhibit “small-on-top” stratification with an accumulation (depletion) of smaller (larger) particles in the top region of the drying film, consistent with the predic ...
DOI:
10.1021/acs.langmuir.8b03659

16. Self-Propelled Motion of a Camphor Disk on a Photosensitive Amphiphilic Molecular Layer

Author:
Nakata, Satoshi; Nasu, Kyoko; Irie, Yasutaka; Hatano, Sayaka
Source:
Langmuir 2019 v.35 no.12 pp. 4233-4237
ISSN:
1520-5827
Subject:
camphor; irradiation; photochemical reactions; photosensitivity; ultraviolet radiation
Abstract:
... We have studied the self-propelled motion of a camphor disk on a 2,2′-bis(2-chlorophenyl)-4,4′,5,5′-tetraphenyl-1,2′-biimidazole (o-Cl-HABI) molecular layer, which was developed on water, as a photomechanical sensing system. The o-Cl-HABI dimer changed to its monomeric form upon UV light irradiation, and as a result, the surface pressure of the o-Cl-HABI molecular layer decreased. The reciprocatin ...
DOI:
10.1021/acs.langmuir.8b04285

17. Hetero-difunctional Reagent with Superior Flotation Performance to Chalcopyrite and the Associated Surface Interaction Mechanism

Author:
Liu, Sheng; Xie, Lei; Liu, Guangyi; Zhong, Hong; Wang, Yixiang; Zeng, Hongbo
Source:
Langmuir 2019 v.35 no.12 pp. 4353-4363
ISSN:
1520-5827
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; adsorption; air; atomic force microscopy; bubbles; copper; engineering; hydrodynamics; hydrophobic bonding; industrial applications; ligands; pH; pyrite; sodium
Abstract:
... Surface modification by chemical reagents is of profound importance to modulate the surface characteristic and functionality of materials, which has attracted tremendous interest in many research fields and industrial applications, such as froth flotation of minerals. In this work, a new reagent S-[(2-hydroxyamino)-2-oxoethyl]-O-octyl-dithiocarbonate ester (HAOODE) with heterodifunctional ligands ...
DOI:
10.1021/acs.langmuir.9b00156

18. Capillary Stress and Structural Relaxation in Moist Granular Materials

Author:
Zhou, Tingtao; Ioannidou, Katerina; Masoero, Enrico; Mirzadeh, Mohammad; Pellenq, Roland J.-M.; Bazant, Martin Z.
Source:
Langmuir 2019 v.35 no.12 pp. 4397-4402
ISSN:
1520-5827
Subject:
cement; durability; evaporation; mathematical models; porous media; sorption
Abstract:
... A numerical and theoretical framework to address the poromechanical effect of capillary stress in complex mesoporous materials is proposed and exemplified for water sorption in cement. We first predict the capillary condensation/evaporation isotherm using lattice-gas simulations in a realistic nanogranular cement model. A phase-field model to calculate moisture-induced capillary stress is then int ...
DOI:
10.1021/acs.langmuir.8b03400

19. In Situ Seed-Mediated High-Yield Synthesis of Copper Nanowires on Large Scale

Author:
Fu, Qi-Qi; Li, Yu-Da; Li, Hui-Hui; Xu, Liang; Wang, Zhi-Hua; Yu, Shu-Hong
Source:
Langmuir 2019 v.35 no.12 pp. 4364-4369
ISSN:
1520-5827
Subject:
byproducts; commercialization; copper; copper nanoparticles; electrodes; electronics; ions; nanowires; purification methods; ripening
Abstract:
... Copper nanowires (Cu NWs) are among ideal candidates for fabricating various advanced nanodevices, especially flexible electronics and transparent conductive electrodes. However, although many efforts have been made, the commercialization of Cu NWs is still difficult. Herein, we report an in situ seed-mediated two-step strategy to synthesize well-defined Cu NWs in high yield. In the first step, th ...
DOI:
10.1021/acs.langmuir.9b00042

20. The Stefan–Reynolds Model and the Modified Stefan–Reynolds Model for Studying Bubble–Particle Attachment Interactions in the Context of Flotation

Author:
Zhou, You; Albijanic, Boris; Tadesse, Bogale; Wang, Yuling; Yang, Jianguo; Zhu, Xiangnan
Source:
Langmuir 2019 v.35 no.12 pp. 4278-4286
ISSN:
1520-5827
Subject:
air; bubbles; hydrophobicity; liquid-air interface; models; quartz; surfactants
Abstract:
... Bubble–particle attachment is the key step for successful flotation. Modeling of attachment interactions between air bubbles and particles after their collision can be analyzed using the Stefan–Reynolds model (immobile bubble surfaces) and the modified Stefan–Reynolds model (mobile bubble surfaces). However, these models have been rarely used, and the limitations of these models have not yet been ...
DOI:
10.1021/acs.langmuir.9b00397