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Journal Langmuir

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Transferred Photothermal to Photodynamic Therapy Based on the Marriage of Ultrathin Titanium Carbide and Up-Conversion Nanoparticles.

Danyang Xu, Fan Yang, Danyao Qu, Zhenni Wang, Long Gu, Weiwei Wu, Ruichan Lv,

In this research, upconversion nanoparticles (UCNPs) are used as a light conversion carrier, and their deep light source penetrability is closely combined with ultrathin two-dimensional (2D) Ti3C2Tx to explore the application efficiency of the complex in phototherapy. Due to the advantages of 2D Ti3C2Tx with its high absorbance to ultraviolet/visible ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Effects of Geometric Confinement on Zero-Gravity Droplets between Two Parallel Planes.

Cunjing Lv, Bin Zhang, Songlin Shi, Pengfei Hao,

Investigation of geometric effects on confined droplets is important for the fundamental understanding of the ubiquitous wetting phenomena in nature as well as for a variety of practical applications. In this study, the effect of geometric confinement on the wetting behavior of a droplet confined between two parallel rigid planes ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Functionalizing a Polyelectrolyte Complex with Chitosan Derivatives to Tailor Membrane Surface Properties.

Yechan Won, Kazi Sadman, Gabrielle Stein, Fabrizio Sabba, Kenneth R Shull, Kimberly A Gray,

Polyelectrolyte complex (PEC) materials show promise in the development of tunable membranes for aqueous and organic solvent separations, as well as in the creation of surface layers for fouling control. In this study, we developed a polyelectrolyte complex (PEC) functionalized by negatively charged carboxymethyl chitosan (CMC-) and positively charged quaternized ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Deposition Behavior of Polyaniline on Carbon Nanofibers by Oxidative Chemical Vapor Deposition.

Xiaobo Li, Ayda Rafie, Vibha Kalra, Kenneth K S Lau,

Oxidative chemical vapor deposition (oCVD) offers unique advantages as a liquid-free processing technique in synthesizing and integrating conducting polymers, including polyaniline (PANI), by enabling conformal coatings onto nanostructured substrates, like carbon nanofibers. With relatively thick nanofiber mats, the challenge is to ensure uniform coating thickness through the porous substrates. Here, ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Revealing the Surface Effect on Gas Transport and Mechanical Properties in Nonporous Polymeric Membranes in Terms of Surface Free Energy.

Tatyana S Sazanova, Kseniia V Otvagina, Sergey S Kryuchkov, Dmitriy M Zarubin, Diana G Fukina, Andrey V Vorotyntsev, Ilya V Vorotyntsev,

The contribution of surface roughness of nonporous polymeric membranes to their gas separation and mechanical properties was studied in terms of surface free energy. The membranes samples were prepared based on glassy polymers with different chain rigidity, namely polysulfone (PSU), cellulose triacetate (CTA), and poly(vinyl alcohol) (PVA). The results were ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Complex Formation of Sulfobetaine Surfactant and Ionic Polymers and Their Stimuli Responsivity.

Dongwook Kim, Hitomi Sakamoto, Hideki Matsuoka, Yoshiyuki Saruwatari,

We investigated the kinds of complexes sulfobetaine surfactant and ionic polymer formed using lauramidopropyl hydroxysultane (LAPHS) as a sulfobetaine surfactant, poly(sodium styrenesulfonate) (PSSNa) as the anionic polymer and poly[3-(methacrylamido)propyl trimethylammonium chloride] (PMAPTAC) as the cationic polymer. The fundamental properties of LAPHS at various salt concentrations were estimated by various measurements, ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Superior Anchoring of Sodium Polysulfides to the Polar C2N 2D Material: A Potential Electrode Enhancer in Sodium-Sulfur Batteries.

Muhammad Sajjad, Tanveer Hussain, Nirpendra Singh, J Andreas Larsson,

Despite the high theoretical specific energy in rechargeable sodium-sulfur batteries, the shuttle effect severely hampers its capacity and reversibility, which could be overcome by introducing an anchoring material. We, herein, use first-principles calculations to study the low-cost, easily synthesized, environmentally friendly, and stable two-dimensional polar nitrogenated holey graphene (C2N) and ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Statistical Mechanical Model of Gas Adsorption in a Metal-Organic Framework Harboring a Rotaxane Molecular Shuttle.

Jonathan Carney, David Roundy, Cory M Simon,

Metal-organic frameworks (MOFs) are modular and tunable nanoporous materials with applications in gas storage, separations, and sensing. Integrating flexible/dynamic, gas-responsive components into MOFs can give them unique or enhanced adsorption properties. Here, we explore the adsorption properties that could be imparted to a MOF by a rotaxane molecular shuttle (RMS) ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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How Detergents Dissolve Polymeric Micelles: Kinetic Pathways of Hybrid Micelle Formation in SDS and Block Copolymer Mixtures.

Synne Myhre, Matthias Amann, Lutz Willner, Kenneth D Knudsen, Reidar Lund,

Mixtures of amphiphilic polymers and surfactants are used in a wide range of applications, e.g., pharmaceuticals, detergents, cosmetics, and drug delivery systems. Still, many questions remain on how the structure and, in particular, the kinetics of block copolymer micelles are affected in the presence of surfactants and what controls the ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Freezing of Nanofluid Droplets on Superhydrophobic Surfaces.

Xiaoyang Li, Jie Yu, Dinghua Hu, Qiang Li, Xuemei Chen,

Droplet freezing on cold superhydrophobic surfaces has been studied extensively in recent years. However, previous works are mainly focused on studying water droplet freezing behavior; little work has been conducted to investigate the freezing dynamics of nanofluid droplets on superhydrophobic surfaces. In this work, freezing morphologies of water and nanofluid ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Tuning the Light Response of Strong Polyelectrolyte Brushes with Counterions.

Tao Wang, Ran Kou, Jian Zhang, Renwei Zhu, Hongtao Cai, Guangming Liu,

In this work, a negatively charged poly(3-sulfopropyl methacrylate potassium) (PSPMA) brush has been employed as a model system to demonstrate the tuning of the light response of strong polyelectrolyte brushes (SPBs) with counterions. The substitution of K+ counterions by azobenzene-containing counterions (Azo-N+) renders the PSPMA brush light-responsive in aqueous solutions. ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Protein Stabilization and Delivery: A Case Study of Invasion Plasmid Antigen D Adsorbed on Porous Silica.

Nicole A Montoya, Kaylee E Barr, Simon Velasquez Morales, Jorge E Umana, Channary Ny, Rhianna E Roth, Edward J Reyes, Brian C Kirchhoff, Eric R Hartman, Lillian L Higgins, Kalena M Nichol, Ana Rita C Morais, Alan M Allgeier, Phillip Gao, William D Picking, David R Corbin, Mark B Shiflett,

Approximately half of all vaccines produced annually are wasted because effectivity is dependent on protein structure and heat exposure disrupts the intermolecular interactions needed to maintain the structure. Thus, most vaccines require a temperature-controlled supply chain to minimize waste. A more sustainable technology was developed via the adsorption of invasion ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Mucin Biopolymers and Their Barrier Function at Airway Surfaces.

Daniel Song, Devorah Cahn, Gregg A Duncan,

In the lung, the airway epithelium produces secreted and tethered mucin biopolymers to form a mucus hydrogel layer and a surface-attached polymer brush layer. These layers work in concert to facilitate the cilia-mediated transport of mucus for the capture and clearance of inhaled materials to prevent lung damage. The mechanisms ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Repulsive Backbone-Backbone Interactions Modulate Access to Specific and Unspecific Binding Sites on Surface-Bound Mucins.

Theresa M Lutz, Matthias Marczynski, Maximilian J Grill, Wolfgang A Wall, Oliver Lieleg,

Mucin glycoproteins are the matrix-forming key components of mucus, the innate protective barrier protecting us from pathogenic attack. However, this barrier is constantly challenged by mucin-degrading enzymes, which tend to target anionic glycan chains such as sulfate groups and sialic acid residues. Here, we demonstrate that the efficiency of both ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Adsorption Characteristics of Synthesized Polyelectrolytes onto Alumina Nanoparticles and their Application in Antibiotic Removal.

Thi-Huong Dao, Thi-Quynh-Mai Vu, Ngoc-Trung Nguyen, Thu-Thao Pham, Thi-Lien Nguyen, Shin-Ichi Yusa, Tien-Duc Pham,

The present study aims to investigate the adsorption of synthesized poly(2-acrylamide-2-methylpropane sulfonic acid) (PAMPs) onto alumina nanoparticles and their application in the removal of ciprofloxacin (CFX) antibiotic from a water environment. The PAMPs were successfully synthesized and characterized by nuclear magnetic resonance and gel-permeation chromatography methods. The number- and weight-average ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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An Azidolipid Monolayer - Transitions, Miscibility, and UV Reactivity Studied by Infrared Reflection Absorption Spectroscopy.

Matthias Hoffmann, Simon Drescher, Christian Ihling, Dariush Hinderberger, Christian Schwieger,

In this study, we characterized monolayers of an azide-modified lipid at the air-water interface, pure and in its mixtures with the model lipid DPPC, with the aim of proving its potential to be applied for photo-cross-linking with other molecules. We chose a phospholipid bearing a terminal azide group in one ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Do Internal and External Surfaces of Metal-Organic Frameworks Have the Same Hydrophobicity? Insights from Molecular Simulations.

Alexander von Wedelstedt, Haoyuan Chen, Grit Kalies, Randall Q Snurr,

Reliable information on the hydrophobicity of porous materials is important in the design of many catalytic and separation processes. In general, hydrophobicity is assessed by measuring the contact angle of water (external surface) or the adsorption isotherm of water (internal surface). However, it is not clear how these different assessments ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Indocyanine Green Assembled Nanobubbles with Enhanced Fluorescence and Photostability.

Li Yang, Bin Huang, Feng Chen, Juan Jin, Zhiguo Qin, Fang Yang, Yan Li, Ning Gu,

Indocyanine green (ICG) is a near-infrared (NIR) fluorescent dye for extensive biomedical application. However, its fluorescence intensity is limited by its poor aqueous stability and concentration-dependent aggregation. To overcome these limitations, ICG self-assembled nanobubbles (ICG-NBs) with an average size of 244.6 nm are fabricated. In the ICG-NB assembled structures, the ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Structural Changes in Films of Pulmonary Surfactant Induced by Surfactant Vesicles.

Konstantin Andreev, Michael W Martynowycz, Ivan Kuzmenko, Wei Bu, Stephen B Hall, David Gidalevitz,

When compressed by the shrinking alveolar surface area during exhalation, films of pulmonary surfactant in situ reduce surface tension to levels at which surfactant monolayers collapse from the surface in vitro. Vesicles of pulmonary surfactant added below these monolayers slow collapse. X-ray scattering here determined the structural changes induced by ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Peptide-Based Gel in Environmental Remediation: Removal of Toxic Organic Dyes and Hazardous Pb2+ and Cd2+ Ions from Wastewater and Oil Spill Recovery.

Biplab Mondal, Dipayan Bairagi, Nibedita Nandi, Biswanath Hansda, Krishna Sundar Das, Charlotte J C Edwards-Gayle, Valeria Castelletto, Ian W Hamley, Arindam Banerjee,

A dipeptide-based synthetic amphiphile bearing a myristyl chain has been found to form hydrogels in the pH range 6.9-8.5 and organogels in various organic solvents including petroleum ether, diesel, kerosene, and petrol. These organogels and hydrogels have been thoroughly studied and characterized by different techniques including high-resolution transmission electron microscopy, ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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DOTA Glycodendrimers as Cu(II) Complexing Agents and Their Dynamic Interaction Characteristics toward Liposomes.

Marianna Carone, Silvia Moreno, Michela Cangiotti, Maria Francesca Ottaviani, Peng Wang, Riccardo Carloni, Dietmar Appelhans,

Copper (Cu)(II) ions, mainly an excess amount, play a negative role in the course of several diseases, like cancers, neurodegenerative diseases, and the so-called Wilson disease. On the contrary, Cu(II) ions are also capable of improving anticancer drug efficiency. For this reason, it is of great interest to study the ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Density Functional Theory and Thermodynamics Modeling Inner-Sphere Oxyanion Adsorption on the Hydroxylated α-Al2O3(001) Surface.

Ali Abbaspour Tamijani, Jennifer L Bjorklund, Logan J Augustine, Jeffrey G Catalano, Sara E Mason,

The inner-sphere adsorption of AsO43-, PO43-, and SO42- on the hydroxylated α-Al2O3(001) surface was modeled with the goal of adapting a density functional theory (DFT) and thermodynamics framework for calculating the adsorption energetics. While DFT is a reliable method for predicting various properties of solids, including crystalline materials comprised of ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Open-Channel Capillary Trees and Capillary Pumping.

Jing J Lee, Jean Berthier, Kathleen E Kearney, Erwin Berthier, Ashleigh B Theberge,

Velocity of capillary flow in closed or open channels decreases as the flow proceeds down the length of the channel, varying as the inverse of the square root of time or as the inverse of travel distance. In order to increase the flow rate-and extend the duration of the flow-capillary ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Reaction of Hydrazine with Solution- and Vacuum-Prepared Selectively Terminated Si(100) Surfaces: Pathways to the Formation of Direct Si-N Bonds.

Dhamelyz Silva-Quinones, Chuan He, Kevin J Dwyer, Robert E Butera, George T Wang, Andrew V Teplyakov,

The reactivity of liquid hydrazine (N2H4) with respect to H-, Cl-, and Br-terminated Si(100) surfaces was investigated to uncover the principles of nitrogen incorporation into the interface. This process has important implications in a wide variety of applications, including semiconductor surface passivation and functionalization, nitride growth, and many others. The ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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Quantifying the Counterion-Specific Effect on Surfactant Adsorption Using Modeling, Simulation, and Experiments.

Mengsu Peng, Timothy T Duignan, Anh V Nguyen,

Ionic surfactants behave differently in the presence of various counterions, which plays an important role in many scientific and engineering processes. Previous work has shown that the counterion-specific surface tension can be reproduced with classical adsorption models, but the underlying origin of this effect has not been explained. In this ... Read more >>

Langmuir (Langmuir : the ACS journal of surfaces and colloids)
[2020, :]

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