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Aqueous Synthesis of High-Quality Cu2ZnSnS4 Nanocrystals and Their Thermal Annealing Characteristics

19.01.2018 | Cameron Ritchie; Anthony S. R. Chesman; Mark Styles; Jacek J. Jasieniak; Paul Mulvaney, Langmuir, 2018

Copper zinc tin sulfide (CZTS) nanocrystal inks are promising candidates for the development of cheap, efficient, scalable, and nontoxic photovoltaic (PV) devices. However, optimization of the synthetic chemistry to achieve these goals remains a key challenge. Herein we describe a single-step, ...

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Monitoring Thiol–Ligand Exchange on Au Nanoparticle Surfaces

19.01.2018 | Martin Kluenker; Mihail Mondeshki; Muhammad Nawaz Tahir; Wolfgang Tremel, Langmuir, 2018

Surface functionalization of nanoparticles (NPs) plays a crucial role in particle solubility and reactivity. It is vital for particle nucleation and growth as well as for catalysis. This raises the quest for functionalization efficiency and new approaches to probe the degree of surface coverage. ...

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Investigation of the Internal Chemical Composition of Chitosan-Based LbL Films by Depth-Profiling X-ray Photoelectron Spectroscopy (XPS) Analysis

19.01.2018 | Thiago B. Taketa; Danilo M. dos Santos; Anderson Fiamingo; Juliana M. Vaz; Marisa M. Beppu; Sérgio P. Campana-Filho; ..., Langmuir, 2018

Chitosan-based thin films were assembled using the layer-by-layer technique, and the axial composition was accessed using X-ray photoelectron spectroscopy with depth profiling. Chitosan (CHI) samples possessing different degrees of acetylation (DA̅) and molecular weight (Mv̅) produced via the ...

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Effect of Large Electrolyte Anions on the Sequential Oxidations of Bis(fulvalene)diiron Attached to Glassy Carbon by an Ethynyl Linkage

19.01.2018 | Matthew V. Sheridan; Paul Gamm; Severin T. Schneebeli; Rochus Breuer; Michael Schmittel; William E. Geiger, Langmuir, 2018

Two ethynyl-derivatized isomers of bis(fulvalene)diiron (BFD, 1,1′-biferrocenylene) were prepared and covalently attached to glassy carbon electrodes through their ethynyl group by three different electrode modification methods. Cyclic voltammetry and square wave (SW) voltammetry were used to ...

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Silver Nanocube and Nanobar Growth via Anisotropic Monomer Addition and Particle Attachment Processes

19.01.2018 | Dongdong Xiao; Zhigang Wu; Miao Song; Jaehun Chun; Gregory K. Schenter; Dongsheng Li, Langmuir, 2018

Understanding the growth mechanism of noble metal nanocrystals during solution synthesis is of significant importance for shape and property control. However, much remains unknown about the growth pathways of metal nanoparticles due to the lack of direct observation. Using an in situ transmission ...

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Modeling Nanoparticle Dispersion in Electrospun Nanofibers

18.01.2018 | Christopher Balzer; Mitchell Armstrong; Bohan Shan; Yingjie Huang; Jichang Liu; Bin Mu, Langmuir, 2018

The quality of nanoparticle dispersion in a polymer matrix significantly influences the macroscopic properties of the composite material. Like general polymer–nanoparticle composites, electrospun nanofiber nanoparticle composites do not have an adopted quantitative model for dispersion throughout ...

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Fluorescence Quenching Investigation of Methyl Red Adsorption on Aluminum-Based Metal–Organic Frameworks

18.01.2018 | Jun-Kai Chen; Shan-Min Yang; Bing-Han Li; Chia-Her Lin; Szetsen Lee, Langmuir, 2018

The adsorption of methyl red (MR) isomers (ortho, meta, and para) on metal–organic frameworks (MOFs) was investigated by using a fluorescence quenching technique. All three MR isomers were found to quench the fluorescence of MOFs effectively. Nonlinear fluorescence quenching trends were observed ...

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Stable Inks Containing Upconverting Nanoparticles Based on an Oil-in-Water Nanoemulsion

18.01.2018 | Jeevan M. Meruga; William M. Cross; Jacob B. Petersen; P. Stanley May; Aravind Baride; Khadijah Cessac; Jon J. Kellar, Langmuir, 2018

An oil-in-water nanoemulsion capable of dispersing upconverting nanoparticles (UCNPs) for 7 months was investigated. Negative staining transmission electron microscopy shows that the UCNPs reside in the oil phase of the nanoemulsion. Dynamic light scattering measurements indicate that the ...

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Polydopamine and Polydopamine–Silane Hybrid Surface Treatments in Structural Adhesive Applications

18.01.2018 | Ngon T. Tran; David P. Flanagan; Joshua A. Orlicki; Joseph L. Lenhart; Kenneth L. Proctor; Daniel B. Knorr, Jr., Langmuir, 2018

Numerous studies have focused on the remarkable adhesive properties of polydopamine, which can bind to substrates with a wide range of surface energies, even under aqueous conditions. This behavior suggests that polydopamine may be an attractive option as a surface treatment in structural bonding ...

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Mannose-Modificated Polyethylenimine: A Specific and Effective Antibacterial Agent against Escherichia coli

18.01.2018 | Mei Liu; Jiao Li; Baoxin Li, Langmuir, 2018

Polyethylenimine (PEI) has antimicrobial activity against Gram-positive (Staphylococcus aureus, S. aureus) and Gram-negative (Escherichia coli, E. coli), bacteria but is highly cytotoxic, and the selective antimicrobial activity against S. aureus is obviously better than that against E. coli. To ...

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