U.S. flag

An official website of the United States government

PubAg

Main content area

You searched for: Subject "X-radiation" Remove constraint Subject: "X-radiation" Journal Langmuir Remove constraint Journal: Langmuir
Start Over

Search

554  Search Results

« Previous | 1 - 20 of 554 |
Number of results to display per page

Search Results

1. Modified Organosilane Monolayers With Enhanced Radiation Stability

Author:
Hinckley, Adam P.; Muscat, Anthony J.
Source:
Langmuir 2020 v.36 no.15 pp. 4116-4122
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; X-ray photoelectron spectroscopy; carbon; detection limit; photons; silane; silica; titanium dioxide;     Show all 8 Subjects
Abstract:
... Organosilane monolayers containing long carbon chains are susceptible to damage when exposed to X-rays and other radiation during characterization or processing. The origin of the damage has been attributed to both energetic photons and photoelectrons. These particles can break bonds in the molecules comprising the layer altering its composition and structure and can create silanol groups at the i ...
DOI:
10.1021/acs.langmuir.9b03091

2. n-Butanol/Water Interface-Aided Physicochemical Tuning of Two-Dimensional Transition-Metal Oxides

Author:
Rahman Poolakkandy, Rasha; Kaladi Chondath, Subin; Puthiyottil, Nesleena; Davis, Dayana; Menamparambath, Mini Mol
Source:
Langmuir 2020 v.36 no.4 pp. 872-879
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; absorption; butanol; cobalt; mass transfer; metal ions; nickel; oxides; solvents;     Show all 9 Subjects
Abstract:
... Herein, we report a facile regulation of the interface of two immiscible solvents, n-butanol and water, to achieve the physicochemical tuning of the transition-metal oxide nickel cobaltite. The crystal nucleation and the growth of nickel cobaltite into distinct morphology are highly dependent on the orientation and the mass transfer of the reactive species through the reactive interface layer. A d ...
DOI:
10.1021/acs.langmuir.9b03362

3. Controlled Synthesis of Gold Nanoparticles in Copolymers Nanomolds by X-ray Radiolysis

Author:
Bondaz, Louis; Fontaine, Philippe; Muller, François; Pantoustier, Nadège; Perrin, Patrick; Morfin, Isabelle; Goldmann, Michel; Cousin, Fabrice
Source:
Langmuir 2020 v.36 no.22 pp. 6132-6144
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; X-ray scattering; aqueous solutions; composite polymers; gold; ions; irradiation; micelles; moieties; nanogold; nanoparticles; neutron diffraction; radiolysis; solvents;     Show all 14 Subjects
Abstract:
... We show by X-ray and neutron small-angle scattering that gold nanoparticles with controlled sizes and morphologies can be obtained by the metallic reduction of AuCl₄– ions trapped in 3D organic molds by X-ray radiolysis. The molds are spherical frozen micelles of polystyrene-b-poly(dimethylaminoethyl methacrylate) (PS-b-PDMAEMA) block copolymer in acidic aqueous solution with a PS spherical core s ...
DOI:
10.1021/acs.langmuir.0c00554

4. X-ray and Neutron Reflectivity Studies of Styrene-Maleic Acid Copolymer Interactions with Galactolipid-Containing Monolayers

Author:
Phan, Minh D.; Korotych, Olena I.; Brady, Nathan G.; Davis, Madeline M.; Satija, Sushil K.; Ankner, John F.; Bruce, Barry D.
Source:
Langmuir 2020 v.36 no.14 pp. 3970-3980
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; X-ray reflectivity; adsorption; composite polymers; galactolipids; liquid-air interface; membrane proteins; nanomaterials; neutron diffraction; phospholipids; reflectometry; solubilization;     Show all 12 Subjects
Abstract:
... Styrene-maleic acid (SMA) copolymers have recently gained attention for their ability to facilitate the detergent-free solubilization of membrane protein complexes and their native boundary lipids into polymer-encapsulated, nanosized lipid particles, referred to as SMALPs. However, the interfacial interactions between SMA and lipids, which dictate the mechanism, efficiency, and selectivity of lipi ...
DOI:
10.1021/acs.langmuir.9b03817

5. Observation of Ultrathin Precursor Film Formation during Ge–Si Liquid-Phase Epitaxy from an Undersaturated Solution

Author:
Vonk, Vedran; Pontoni, Diego; Cremers, Melissa; Kerkenaar, Anne; Bode, Arno A. C.; Szweryn, Wiesiek; Nowak, Gregor; de Jong, Aryan E. F.; Dosch, Helmut; Vlieg, Elias
Source:
Langmuir 2017 v.33 no.3 pp. 814-819
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; germanium; silicon; thermodynamics;     Show all 4 Subjects
Abstract:
... Our in situ X-ray study shows that a silicon substrate in contact with an undersaturated In(Ge) solution is wetted by an approximately 1 nm thin germanium film, which does not grow any thicker. The results can be understood by the use of thickness-dependent correlated interfacial energies. This near-equilibrium heterogeneous interface structure marks the initial stage of crystal growth before the ...
DOI:
10.1021/acs.langmuir.6b03984

6. Tribo-Induced Near-Infrared Light Emission between Metal and Quartz

Author:
Song, Changhui; Wang, Kuifang; Sang, Xiao; Xu, Xuefeng; Ma, Liran; Luo, Jianbin; Wen, Shizhu
Source:
Langmuir 2020 v.36 no.5 pp. 1165-1173
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; X-ray photoelectron spectroscopy; density functional theory; energy; friction; luminescence; metals; near infrared radiation; near-infrared spectroscopy; quartz; wavelengths;     Show all 11 Subjects
Abstract:
... Triboluminescence (TL) refers to the luminescence phenomenon at the material surface under the action of pressure or shear. This fascinating phenomenon can directly convert mechanical energy into light emission without the need for other auxiliary components; therefore, it attracts more and more researchers to conduct research in different wavelength ranges, such as X-ray, ultraviolet, visible lig ...
DOI:
10.1021/acs.langmuir.9b03738

7. Comprehensive Study of the Liquid Expanded–Liquid Condensed Phase Transition in 1,2-Dimyristoyl-sn-glycero-3-phospho-l-serine Monolayers: Surface Pressure, Volta Potential, X-ray Reflectivity, and Molecular Dynamics Modeling

Author:
Ermakov, Yu. A.; Asadchikov, V. E.; Roschin, B. S.; Volkov, Yu. O.; Khomich, D. A.; Nesterenko, A. M.; Tikhonov, A. M.
Source:
Langmuir 2019 v.35 no.38 pp. 12326-12338
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; X-ray reflectivity; electric field; hydrophobicity; lipids; liquid crystals; models; molecular dynamics; phase transition;     Show all 9 Subjects
Abstract:
... An integrated approach is applied to reveal fine changes in the surface-normal structure of 1,2-dimyristoyl-sn-glycero-3-phospho-l-serine (DMPS) monolayers at the air–lipid–water interface occurring in a liquid expanded (LE)–liquid condensed (LC) transition. The combination of the Langmuir monolayer technique, X-ray reflectometry, and molecular dynamics (MD) modeling provides new insight into the ...
DOI:
10.1021/acs.langmuir.9b01450

8. Polyunsaturated Phospholipid Modified Membrane Degradation Catalyzed by a Secreted Phospholipase A2

Author:
Zhang, Pin; Villanueva, Veronica; Kalkowski, Joseph; Liu, Chang; Pham, Tiep; Perez-Salas, Ursula; Bu, Wei; Lin, Binhua; Liu, Ying
Source:
Langmuir 2019 v.35 no.36 pp. 11643-11650
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; catalytic activity; deformation; fluorescence microscopy; hydrolysis; liquid crystals; mixing ratio; nanomedicine; phospholipase A2; phospholipids;     Show all 10 Subjects
Abstract:
... To optimize the compositions of the lipid-based nanomedicine and to advance understanding of the roles of polyunsaturated phospholipids in biological membranes, this study examined the effects of polyunsaturated phospholipids on the degradation of giant unilamellar vesicles catalyzed by a secreted phospholipase A2 (sPLA₂) using fluorescence microscopy. Molecular interfacial packing, interaction, a ...
DOI:
10.1021/acs.langmuir.9b01476

9. Counterion Exchange in Peptide-Complexed Core–Shell Microgels

Author:
Liang, Jing; Xiao, Xixi; Chou, Tseng-Ming; Libera, Matthew
Source:
Langmuir 2019 v.35 no.29 pp. 9521-9528
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; antimicrobial peptides; buffers; detection limit; electrolytes; electron microscopy; electrostatic interactions; microgels; polyacrylic acid; sodium;     Show all 10 Subjects
Abstract:
... The complexation of polyvalent macroions with oppositely charged polyelectrolyte microgels can lead to core–shell structures. The shell is believed to be highly deswollen with a high concentration of counter-macroions. The core is believed to be relatively free of macroions but under a uniform compressive stress due to the deswollen shell. We use cryo-scanning electron microscopy (SEM) with X-ray ...
DOI:
10.1021/acs.langmuir.9b01058

10. In Operando Monitoring of Dynamic Recovery in 3D-Printed Thermoset Nanocomposites by XPCS

Author:
Johnson, Kyle J.; Wiegart, Lutz; Abbott, Andrew C.; Johnson, Elias B.; Baur, Jeffery W.; Koerner, Hilmar
Source:
Langmuir 2019 v.35 no.26 pp. 8758-8768
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; anisotropy; carbon; clay; epoxides; extrusion; geometry; manufacturing; monitoring; nanocomposites; nanoparticles; photons; silicates; spectroscopy;     Show all 14 Subjects
Abstract:
... Extrusion-based additive manufacturing methods, such as direct-write of carbon fiber-reinforced epoxy inks, have become an attractive route toward development of structural composites in recent years, because of emerging techniques such as big area additive manufacturing. The development of improved materials for these methods has been a major focus area; however, an understanding of the effects o ...
DOI:
10.1021/acs.langmuir.9b00766

11. Direct Visualization of the Behavior and Shapes of the Nanoscale Menisci of an Evaporating Water Droplet on a Hydrophilic Nanotextured Surface via High-Resolution Synchrotron X-ray Imaging

Author:
Yu, Dong In; Doh, Seungwoo; Kwak, Ho Jae; Hong, Jiwoo; Sapkal, Narayan Pandurang; Kim, Moo Hwan
Source:
Langmuir 2019 v.35 no.19 pp. 6460-6467
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; droplets; evaporation; hydrophilicity; image analysis; liquid-air interface; liquids; nanomaterials;     Show all 8 Subjects
Abstract:
... Despite considerable research interest due to omnipresent and practical importance of interfacial phenomena (e.g., wetting and dewetting) on nanotextured surfaces in the academic and industrial fields, direct visualization of the behavior and shapes of liquid–vapor interfaces between nanoscale structures remains an arduous task because of the resolution limitations of visualization techniques. In ...
DOI:
10.1021/acs.langmuir.8b04109

12. X-ray and Neutron Reflectometry of Thin Films at Liquid Interfaces

Author:
Delcea, Mihaela; Helm, Christiane A.
Source:
Langmuir 2019 v.35 no.26 pp. 8519-8530
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; X-ray reflectivity; air; ionic liquids; lipids; liquids; metals; models; polymers; reflectometry; roughness; thermodynamics;     Show all 12 Subjects
Abstract:
... In the 1980s, Helmuth Möhwald studied lipid monolayers at the air/water interface to understand the thermodynamically characterized phases at the molecular level. In collaboration with Jens Als-Nielsen, X-ray reflectometry was used and further developed to determine the electron density profile perpendicular to the water surface. Using a slab model, parameters such as thickness and density of the ...
DOI:
10.1021/acs.langmuir.8b04315

13. Wetting Criteria of Intrinsic Contact Angle To Distinguish between Hydrophilic and Hydrophobic Micro-/Nanotextured Surfaces: Experimental and Theoretical Analysis with Synchrotron X-ray Imaging

Author:
Yu, Dong In; Kwak, Ho Jae; Park, Chulmin; CHOI, Chiwoong; Sapkal, Narayan Pandurang; Hong, Jiwoo; Kim, Moo Hwan
Source:
Langmuir 2019 v.35 no.10 pp. 3607-3614
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; computed tomography; contact angle; geometry; hydrophilicity; hydrophobicity; image analysis; theoretical models;     Show all 8 Subjects
Abstract:
... In this study, the existing knowledge on the wetting criterion, that is, the intrinsic contact angle, for distinguishing between hydrophilic and hydrophobic textured surfaces is verified experimentally. A precise apparent contact angle is measured on micro-, nano-, and micro-/nanotextured surfaces to quantitatively define the surface-wetting conditions. In particular, X-ray tomography is introduce ...
DOI:
10.1021/acs.langmuir.8b03407

14. Influence of CNTs on the Crystalline Microstructure and Ferroelectric Behavior of P(VDF-TrFE)

Author:
Wang, Min; Li, Lingdong; Zhou, Shenglin; Tang, Rujun; Yang, Zhaohui; Zhang, Xiaohua
Source:
Langmuir 2018 v.34 no.36 pp. 10702-10710
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; carbon nanotubes; crystal structure; crystals; microstructure;     Show all 5 Subjects
Abstract:
... We investigate the effect of carbon nanotubes (CNTs) on the crystalline microstructure and ferroelectric behavior of polyvinylidene fluoride-co-trifluoroethylene (P(VDF-TrFE)). X-ray analysis suggests that CNT can act as a template and direct the chain orientation of P(VDF-TrFE) crystals. In the presence of CNTs, the molecular chain axis (c axis) of the β-phase crystal is oriented parallel to the ...
DOI:
10.1021/acs.langmuir.8b02392

15. Influence of Substrate Bonding and Surface Morphology on Dynamic Organic Layer Growth: Perylenetetracarboxylic Dianhydride on Au(111)

Author:
Schmidt, Thomas; Marchetto, Helder; Groh, Ullrich; Fink, Rainer H.; Freund, Hans-Joachim; Umbach, Eberhard
Source:
Langmuir 2018 v.34 no.19 pp. 5444-5453
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; absorption; adsorption; desorption; electron microscopy; gold; silver;     Show all 7 Subjects
Abstract:
... We investigated the dynamics of the initial growth of the first epitaxial layers of perylenetetracarboxylic dianhydride (PTCDA) on the Au(111) surface with high lateral resolution using the aberration-corrected spectro-microscope SMART. With this instrument, we could simultaneously study the different adsorption behaviors and layer growth on various surface areas consisting of either a distributio ...
DOI:
10.1021/acs.langmuir.8b00493

16. Device-Compatible Chiroptical Surfaces through Self-Assembly of Enantiopure Allenes

Author:
Ozcelik, A.; Pereira-Cameselle, R.; von Weber, A.; Paszkiewicz, M.; Carlotti, M.; Paintner, T.; Zhang, L.; Lin, T.; Zhang, Y.-Q.; Barth, J. V.; van den Nobelen, T.; Chiechi, R. C.; Jakob, M.; Heiz, U.; Chiussi, S.; Kartouzian, A.; Klappenberger, F.; Alonso-Gómez, J. L.
Source:
Langmuir 2018 v.34 no.15 pp. 4548-4553
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; X-ray photoelectron spectroscopy; absorption; enantiomers; gold; nanomaterials;     Show all 6 Subjects
Abstract:
... Chiroptical methods have been proven to be superior compared to their achiral counterparts for the structural elucidation of many compounds. To expand the use of chiroptical systems to everyday applications, the development of functional materials exhibiting intense chiroptical responses is essential. Particularly, tailored and robust interfaces compatible with standard device operation conditions ...
DOI:
10.1021/acs.langmuir.8b00305

17. Unraveling the Formation Mechanism of Dendritic Fibrous Nanosilica

Author:
Maity, Ayan; Das, Avik; Sen, Debasis; Mazumder, Subhasish; Polshettiwar, Vivek
Source:
Langmuir 2017 v.33 no.48 pp. 13774-13782
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; droplets; electron microscopy; emulsions;     Show all 4 Subjects
Abstract:
... We studied the formation mechanism of dendritic fibrous nanosilica (DFNS) that involves several intriguing dynamical steps. Through electron microscopy and real-time small-angle X-ray scattering studies, it has been demonstrated that the structural evolution of bicontinuous microemulsion droplets (BMDs) and their subsequent coalescence, yielding nanoreactor template, is responsible for to the form ...
DOI:
10.1021/acs.langmuir.7b02996

18. Analysis of Trisiloxane Phosphocholine Bilayers

Author:
Frampton, Mark B.; Marquardt, Drew; Letofsky-Papst, Ilse; Pabst, Georg; Zelisko, Paul M.
Source:
Langmuir 2017 v.33 no.20 pp. 4948-4953
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; aqueous solutions; extrusion; lipids;     Show all 4 Subjects
Abstract:
... We have synthesized unique siloxane phosphocholines and characterized their aggregates in aqueous solution. The siloxane phosphocholines form nearly monodisperse vesicles in aqueous solution without the need for secondary extrusion processes. The area/lipid, lipid volume, and bilayer thickness were determined from small-angle X-ray scattering experiments. The impetus for the spontaneous formation ...
DOI:
10.1021/acs.langmuir.6b04162
PubMed:
28471667
PubMed Central:
PMC5462096

19. pH-Sensitive Adsorption Behavior of Polymer Particles at the Air–Water Interface

Author:
Fujii, Syuji; Mouri, Emiko; Akiyama, Ko; Nakayama, Saori; Uda, Kyohei; Nakamura, Yoshinobu; Matsuoka, Hideki
Source:
Langmuir 2017 v.33 no.6 pp. 1451-1459
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; adsorption; pH; polymers; reflectometry; trapping;     Show all 6 Subjects
Abstract:
... pH-Sensitive adsorption of polymer particles bearing poly[2-(dimethylamino)ethyl methacrylate] hairs at the air–water interface was investigated using a surface tensiometer, a Langmuir–Blodgett trough, and an X-ray reflectometer. We clarified that the particles are adsorbed at the interface at basic pH; by contrast, at acidic pH, only a small number of particles are adsorbed, whereas the majority ...
DOI:
10.1021/acs.langmuir.6b03895

20. Quantitative Characterization of a Desalination Membrane Model System by X-ray Photoelectron Spectroscopy

Author:
Buechner, Christin; Gericke, Sabrina M.; Trotochaud, Lena; Karslıoǧlu, Osman; Raso, Joseph; Bluhm, Hendrik
Source:
Langmuir 2019 v.35 no.35 pp. 11315-11321
ISSN:
1520-5827
Subject:
X-radiation,   etc   ; X-ray photoelectron spectroscopy; crosslinking; desalination; fouling; microscopy; models; moieties; polyamides; quantitative analysis; reverse osmosis; water pollution;     Show all 12 Subjects
Abstract:
... Aromatic polyamide films form the active layer in reverse osmosis desalination membranes. Despite widespread use of this technology, it suffers from low rejection rates for certain water contaminants and from membrane fouling. Through a better understanding of the fundamental surface chemical processes during reverse osmosis desalination, advances in membrane and material design are expected. The ...
DOI:
10.1021/acs.langmuir.9b01838