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You searched for: Journal Langmuir Remove constraint Journal: Langmuir Publication Year 2018 Remove constraint Publication Year: 2018 Source 2018 v.34 no.41 Remove constraint Source: 2018 v.34 no.41
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1. Multifunctional Dendrimer-Entrapped Gold Nanoparticles Conjugated with Doxorubicin for pH-Responsive Drug Delivery and Targeted Computed Tomography Imaging

Author:
Zhu, Jingyi; Wang, Guoying; Alves, Carla S.; Tomás, Helena; Xiong, Zhijuan; Shen, Mingwu; Rodrigues, João; Shi, Xiangyang
Source:
Langmuir 2018 v.34 no.41 pp. 12428-12435
ISSN:
1520-5827
Subject:
chemical bonding; computed tomography; dendrimers; doxorubicin; drug therapy; folic acid; gold; image analysis; ligands; models; moieties; nanocarriers; nanogold; nanoparticles; neoplasm cells; neoplasms; pH
Abstract:
... Novel theranostic nanocarriers exhibit a desirable potential to treat diseases based on their ability to achieve targeted therapy while allowing for real-time imaging of the disease site. Development of such theranostic platforms is still quite challenging. Herein, we present the construction of multifunctional dendrimer-based theranostic nanosystem to achieve cancer cell chemotherapy and computed ...
DOI:
10.1021/acs.langmuir.8b02901

2. Rapid Desorption of Polyelectrolytes from Solid Surfaces Induced by Changes of Aqueous Chemistry

Author:
Tiraferri, Alberto; Maroni, Plinio
Source:
Langmuir 2018 v.34 no.41 pp. 12302-12309
ISSN:
1520-5827
Subject:
adsorption; cations; desorption; electrostatic interactions; energy; engineering; ionic strength; molecular weight; pH; polymers; reflectometry; silica
Abstract:
... The short-term desorption induced by changes of aqueous chemistry of predeposited polyelectrolyte layers on solid surfaces was studied with reflectometry. The behavior of a strong polycation, polydiallydimethylammonium chloride (PDADMAC), interacting with flat silica was investigated in detail. Results showed that partial desorption of preadsorbed polymer chains can be quickly triggered by changes ...
DOI:
10.1021/acs.langmuir.8b02573

3. Bioinspired Surface Functionalization of Nanodiamonds for Enhanced Lubrication

Author:
Jiao, Yaoyu; Liu, Sizhe; Sun, Yulong; Yue, Wen; Zhang, Hongyu
Source:
Langmuir 2018 v.34 no.41 pp. 12436-12444
ISSN:
1520-5827
Subject:
Fourier transform infrared spectroscopy; brushes; composite polymers; dopamine; friction; glycerol; lubricants; lubrication; mixing; nanodiamonds; nanoparticles; phosphorylcholine; rolling; thermogravimetry; transmission electron microscopy
Abstract:
... The addition of nanoparticles to water-based lubricants is a commonly used method to improve lubrication, but to the best of our knowledge few studies have been reported to investigate the lubrication property of surface-modified nanodiamonds (ND) with polyzwitterionic brushes. In this study, a bioinspired copolymer containing dopamine and 2-methacryloyloxyethyl phosphorylcholine (MPC) was synthes ...
DOI:
10.1021/acs.langmuir.8b02441

4. Macroscopic Model for Sessile Droplet Evaporation on a Flat Surface

Author:
van der Heijden, Thijs W. G.; Darhuber, Anton A.; van der Schoot, Paul
Source:
Langmuir 2018 v.34 no.41 pp. 12471-12481
ISSN:
1520-5827
Subject:
advection; contact angle; droplets; evaporation; models
Abstract:
... Evaporation of sessile droplets on a flat surface involves a complex interplay between phase change, diffusion, advection, and surface forces. In an attempt to significantly reduce the complexity of the problem and to make it manageable, we propose a simple model hinged on a surface free-energy-based relaxation dynamics of the droplet shape, a diffusive evaporation model, and a contact line pinnin ...
DOI:
10.1021/acs.langmuir.8b02374

5. Optimized Ag Nanovoid Structures for Probing Electrocatalytic Carbon Dioxide Reduction Using Operando Surface-Enhanced Raman Spectroscopy

Author:
Öhl, Denis; Kayran, Yasin U.; Junqueira, João R. C.; Eßmann, Vera; Bobrowski, Tim; Schuhmann, Wolfgang
Source:
Langmuir 2018 v.34 no.41 pp. 12293-12301
ISSN:
1520-5827
Subject:
Raman spectroscopy; carbon dioxide; droplets; electrochemistry; electrodes; nanosilver; nanospheres; polymers; scanning electron microscopy; silicon; silver; wafers
Abstract:
... Surface-enhanced Raman spectroscopy is a powerful analytical tool and a strongly surface structure-dependent process. Importantly, it can be coupled with electrochemistry to simultaneously record vibrational spectroscopic information during electrocatalytic reactions. Highest Raman enhancements are obtained using precisely tuned nanostructures. The fabrication and evaluation of a high number of di ...
DOI:
10.1021/acs.langmuir.8b02501

6. Silica-Supported Sterically Hindered Amines for CO₂ Capture

Author:
Lee, Jason J.; Yoo, Chun-Jae; Chen, Chia-Hsin; Hayes, Sophia E.; Sievers, Carsten; Jones, Christopher W.
Source:
Langmuir 2018 v.34 no.41 pp. 12279-12292
ISSN:
1520-5827
Subject:
Fourier transform infrared spectroscopy; adsorption; ammonium bicarbonate; carbon dioxide; energy costs; polymers; porous media; secondary amines; silica; sorbents; thermogravimetry
Abstract:
... Most studies exploring the capture of CO₂ on solid-supported amines have focused on unhindered amines or alkylimine polymers. It has been observed in extensive solution studies that another class of amines, namely sterically hindered amines, can exhibit enhanced CO₂ capacity when compared to their unhindered counterparts. In contrast to solution studies, there has been limited research conducted o ...
DOI:
10.1021/acs.langmuir.8b02472

7. Transition of Dielectrophoresis-Assembled 2D Crystals to Interlocking Structures under a Magnetic Field

Author:
Jia, Zhuoqiang; Kim, Jae-Hyun; Yi, Gi-Ra; Lee, Stephanie S.
Source:
Langmuir 2018 v.34 no.41 pp. 12412-12418
ISSN:
1520-5827
Subject:
colloids; crystals; dielectrophoresis; electric field; hematite; magnetic fields
Abstract:
... Aspherical cubic hematite colloids with cylindrical arms protruding from each face, referred to as “hexapods”, were assembled via negative dielectrophoresis and then manipulated using an applied magnetic field. Upon application of an ac electric field, the hexapods aligned in close-packed linear chains parallel to the field direction. The chains then aggregated to the center of the device, with ad ...
DOI:
10.1021/acs.langmuir.8b02706

8. Direct Measurement of the Magnitude of the van der Waals Interaction of Single and Multilayer Graphene

Author:
Chiou, Yu-Cheng; Olukan, Tuza Adeyemi; Almahri, Mariam Ali; Apostoleris, Harry; Chiu, Cheng Hsiang; Lai, Chia-Yun; Lu, Jin-You; Santos, Sergio; Almansouri, Ibraheem; Chiesa, Matteo
Source:
Langmuir 2018 v.34 no.41 pp. 12335-12343
ISSN:
1520-5827
Subject:
adhesion; copper; engineering; experimental design; graphene; models; physical phenomena; silica; van der Waals forces; vapors
Abstract:
... Vertical stacking of monolayers via van der Waals (vdW) assembly is an emerging field that opens promising routes toward engineering physical properties of two-dimensional materials. Industrial exploitation of these engineering heterostructures as robust functional materials still requires bounding their measured properties so as to enhance theoretical tractability and assist in experimental desig ...
DOI:
10.1021/acs.langmuir.8b02802

9. Arrested Coalescence of Viscoelastic Droplets: Ellipsoid Shape Effects and Reorientation

Author:
Hao, Chen; Xie, Zhaoyu; Atherton, Timothy J.; Spicer, Patrick T.
Source:
Langmuir 2018 v.34 no.41 pp. 12379-12386
ISSN:
1520-5827
Subject:
deformation; droplets; emulsifying; energy; liquids; petrolatum; viscoelasticity
Abstract:
... The stable configurations formed by two poroelastic, ellipsoid-shaped droplets during their arrested coalescence have been investigated using micromanipulation experiments. Ellipsoidal droplets are produced by millifluidic emulsification of petrolatum into a yield stress fluid that preserves their elongated shape. The liquid meniscus between droplets can transmit stress and instigate movement of t ...
DOI:
10.1021/acs.langmuir.8b02136

10. Counteracting Interfacial Energetics for Wetting of Hydrophobic Surfaces in the Presence of Surfactants

Author:
Bera, Bijoyendra; Carrier, Odile; Backus, Ellen H. G.; Bonn, Mischa; Shahidzadeh, Noushine; Bonn, Daniel
Source:
Langmuir 2018 v.34 no.41 pp. 12344-12349
ISSN:
1520-5827
Subject:
aqueous solutions; contact angle; droplets; hydrophobicity; liquids; spectroscopy; surface tension; surfactants; wettability
Abstract:
... Surface active agents (surfactants) are commonly used to improve the wetting of aqueous solutions on hydrophobic surfaces. The improved wettability is usually quantified as a decrease of the contact angle θ of a droplet on the surface, where the contact angle θ is given by the three surface tensions involved. Surfactants are known to lower the liquid–vapor surface tension, but what they do to the ...
DOI:
10.1021/acs.langmuir.8b02874

11. Kinetic Insights into Marangoni Effect-Assisted Preparation of Ultrathin Hydrogel Films

Author:
Tian, Ye; Gao, Xiaoying; Hong, Wei; Du, Miao; Pan, Pengju; Sun, Jing Zhi; Wu, Zi Liang; Zheng, Qiang
Source:
Langmuir 2018 v.34 no.41 pp. 12310-12317
ISSN:
1520-5827
Subject:
ethanol; fluorescence; gelation; hydrogels; mole fraction; polymers; solvents; surface tension; theoretical models; viscoelasticity
Abstract:
... In a previous work (ACS Appl. Mater. Interfaces 2017, 9, 34349–34355), a facile approach was reported to prepare thin hydrogel films based on the Marangoni effect. After dripping onto a water surface, a drop of ethanol solution of poly(stearyl acrylate-co-acrylic acid) [P(SA-co-AAc)] spread quickly to form a thin film. The solvent exchange from ethanol to water led to the gelation of polymer solut ...
DOI:
10.1021/acs.langmuir.8b02626

12. Lipid Bilayer Disruption by Amphiphilic Janus Nanoparticles: The Role of Janus Balance

Author:
Lee, Kwahun; Yu, Yan
Source:
Langmuir 2018 v.34 no.41 pp. 12387-12393
ISSN:
1520-5827
Subject:
hydrophobicity; lipid bilayers; lipids; nanoparticles; surface area; zwitterions
Abstract:
... Amphiphilic nanoparticles are known to cause defects in lipid bilayers. However, we have shown recently that their disruptive effects are significantly enhanced when surface charges and hydrophobic groups are spatially segregated on opposite hemispheres of a single particle. Using the same amphiphilic cationic/hydrophobic Janus particle system, here we investigate the role of the hydrophilic–lipop ...
DOI:
10.1021/acs.langmuir.8b02298

13. Quantifying Confidence in DFT-Predicted Surface Pourbaix Diagrams of Transition-Metal Electrode–Electrolyte Interfaces

Author:
Vinogradova, Olga; Krishnamurthy, Dilip; Pande, Vikram; Viswanathan, Venkatasubramanian
Source:
Langmuir 2018 v.34 no.41 pp. 12259-12269
ISSN:
1520-5827
Subject:
Bayesian theory; adsorption; catalysts; density functional theory; electrochemistry; electrodes; iridium; pH; palladium; physical phases; platinum; prediction; rhodium; ruthenium; uncertainty; van der Waals forces
Abstract:
... Density functional theory (DFT) calculations have been widely used to predict the activity of catalysts based on the free energies of reaction intermediates. The incorporation of the state of the catalyst surface under the electrochemical operating conditions while constructing the free-energy diagram is crucial, without which even trends in activity predictions could be imprecisely captured. Surf ...
DOI:
10.1021/acs.langmuir.8b02219

14. Light-Induced Conformational Change of Uracil-Anchored Polythiophene-Regulating Thermo-Responsiveness

Author:
Ghosh, Radhakanta; Das, Sujoy; Bhattacharyya, Kalishankar; Chatterjee, Dhruba P.; Biswas, Atosi; Nandi, Arun K.
Source:
Langmuir 2018 v.34 no.41 pp. 12401-12411
ISSN:
1520-5827
Subject:
absorption; electron transfer; emissions factor; fluorescence; halides; ions; light scattering; moieties; particle size; phase transition; polymers; screening; sodium; solar radiation; temperature; uracil; wavelengths
Abstract:
... Tuning the electronic structure of a π-conjugated polymer from the responsive side chains is generally done to get desired optoelectronic properties, and it would be very fruitful when light is used as an exciting tool that can also affect the backbone chain conformation. For this purpose, polythiophene-g-poly-[N-(6-methyluracilyl)-N,N-dimethylamino chloride]ethyl methacrylate (PTDU) is synthesize ...
DOI:
10.1021/acs.langmuir.8b02679

15. Simple and Reliable Method for Studying the Adsorption Behavior of Aquivion Ionomers on Carbon Black Surfaces

Author:
Thoma, Martin; Lin, Wei; Hoffmann, Eva; Sattes, Maria-Melanie; Segets, Doris; Damm, Cornelia; Peukert, Wolfgang
Source:
Langmuir 2018 v.34 no.41 pp. 12324-12334
ISSN:
1520-5827
Subject:
enthalpy; fuel cells; thermogravimetry; electrolytes; entropy; sulfonic acids; sorption isotherms; polymers; titration; soot; zeta potential; calorimetry; adsorption
Abstract:
... A better understanding of the interactions of carbon black and perfluorinated sulfonic acid (PFSA) ionomer helps to improve the effectiveness of polymer electrolyte membrane fuel cells. We present a simple and fast method for quantitative PFSA ionomer analysis based on suspension density measurements. After validation of the reliability of our method by thermogravimetric analysis and isothermal ti ...
DOI:
10.1021/acs.langmuir.8b02726

16. Emulsion Droplets Stabilized by Close-Packed Janus Regular Polygonal Particles

Author:
Koike, Ryotaro; Iwashita, Yasutaka; Kimura, Yasuyuki
Source:
Langmuir 2018 v.34 no.41 pp. 12394-12400
ISSN:
1520-5827
Subject:
colloids; droplets; emulsions
Abstract:
... In Pickering–Ramsden emulsions, the packing structure of the colloidal particles at the liquid–liquid (or liquid–gas) interface significantly affects the structure and behavior of the emulsion. Here, using a series of platelike particles with regular polygonal shapes and Janus amphiphilicity, we created emulsion droplets stabilized by close-packed polygonal particles at the interface. The systemat ...
DOI:
10.1021/acs.langmuir.8b02323

17. Interactions of Fly Ash Particles with Mucin and Serum Albumin

Author:
Guo, Huxiang; Zhang, Yunjie; Huang, Renliang; Su, Rongxin; Qi, Wei; He, Zhimin
Source:
Langmuir 2018 v.34 no.41 pp. 12251-12258
ISSN:
1520-5827
Subject:
adsorption; bovine serum albumin; cattle; fluorescence; fly ash; models; mucins; pollutants; protein secondary structure; quartz crystal microbalance; spectroscopy; stomach; swine
Abstract:
... Fly ash particles can contribute to haze and adverse health outcomes. In this study, two mucins, one from bovine submaxillary glands (bovine submaxillary mucin, BSM) and one from porcine stomach (porcine gastric mucin), as well as bovine serum albumin (BSA), which served as the physical barriers against foreign substances entering the tissues and the blood protein, respectively, were chosen as mod ...
DOI:
10.1021/acs.langmuir.8b02188

18. Size-Defined Cracked Vesicle Formation via Self-Assembly of Gold Nanoparticles Covered with Carboxylic Acid-Terminated Surface Ligands

Author:
Wei, Jinjian; Mitomo, Hideyuki; Tani, Takeharu; Matsuo, Yasutaka; Niikura, Kenichi; Naya, Masayuki; Ijiro, Kuniharu
Source:
Langmuir 2018 v.34 no.41 pp. 12445-12451
ISSN:
1520-5827
Subject:
carboxylic acids; electron microscopy; electrostatic interactions; image analysis; ligands; nanogold; spectral analysis
Abstract:
... The self-assembly of gold nanoparticles (GNPs) into a defined structure, particularly hollow capsule structures, provides great potential for applications in materials science and medicine. However, the complexity of the parameters for the preparation of those structures through self-assembly has limited access to critical mechanistic questions. With this in mind, we have studied GNP vesicle (GNV) ...
DOI:
10.1021/acs.langmuir.8b02966

19. Unidirectional Droplet Transport on the Biofabricated Butterfly Wing

Author:
Li, Peiliu; Zhang, Bo; Zhao, Hongbin; Zhang, Lunjia; Wang, Zhe; Xu, Xiangyu; Fu, Tingting; Wang, Xiaonan; Hou, Yongping; Fan, Yuzun; Wang, Lei
Source:
Langmuir 2018 v.34 no.41 pp. 12482-12487
ISSN:
1520-5827
Subject:
anisotropy; butterflies; droplets; heat transfer; hydrophobicity; surface tension; topography; wings
Abstract:
... Water droplet unidirectional transport on the asymmetric superhydrophobic surface has attracted much interest in theory analysis and applications, such as self-cleaning, antifogging, anti-icing, heat transfer, and so on. Different from the symmetrical performance on the uniform topographies, the droplets acting on the asymmetric surface exhibit an anisotropic state and easily roll off the surface ...
DOI:
10.1021/acs.langmuir.8b02550

20. Droplet Mobility on Hydrophobic Fibrous Coatings Comprising Orthogonal Fibers

Author:
Jamali, M.; Tafreshi, H. Vahedi; Pourdeyhimi, B.
Source:
Langmuir 2018 v.34 no.41 pp. 12488-12499
ISSN:
1520-5827
Subject:
coatings; contact angle; droplets; gravity; hydrophobicity; magnetic materials; mathematical models; polystyrenes
Abstract:
... Water droplet mobility on a hydrophobic surface cannot be guaranteed even when the droplet exhibits a high contact angle (CA) with the surface. In fact, droplet mobility on a surface, especially a fibrous surface, has remained an unsolved empirical problem. This paper is a combined experimental–computational study focused on droplet mobility on a fibrous surface. Electrospun polystyrene (PS) coati ...
DOI:
10.1021/acs.langmuir.8b02810