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1. Analysis of Calcium Transients and Uniaxial Contraction Force in Single Human Embryonic Stem Cell-Derived Cardiomyocytes on Microstructured Elastic Substrate with Spatially Controlled Surface Chemistries

Author:
Grespan, Eleonora; Martewicz, Sebastian; Serena, Elena; Le Houerou, Vincent; Rühe, Jürgen; Elvassore, Nicola
Source:
Langmuir 2016 v.32 no.46 pp. 12190-12201
ISSN:
1520-5827
Subject:
calcium; cardiomyocytes; cell growth; contractile proteins; drugs; evolution; finite element analysis; fluorescence microscopy; functional properties; humans; models; photochemistry; screening
Abstract:
... The mechanical activity of cardiomyocytes is the result of a process called excitation–contraction coupling (ECC). A membrane depolarization wave induces a transient cytosolic calcium concentration increase that triggers activation of calcium-sensitive contractile proteins, leading to cell contraction and force generation. An experimental setup capable of acquiring simultaneously all ECC features ...
DOI:
10.1021/acs.langmuir.6b03138

2. Atomic Layer Deposition of Ultrathin Nickel Sulfide Films and Preliminary Assessment of Their Performance as Hydrogen Evolution Catalysts

Author:
Çimen, Yasemin; Peters, Aaron W.; Avila, Jason R.; Hoffeditz, William L.; Goswami, Subhadip; Farha, Omar K.; Hupp, Joseph T.
Source:
Langmuir 2016 v.32 no.46 pp. 12005-12012
ISSN:
1520-5827
Subject:
X-ray diffraction; X-ray photoelectron spectroscopy; catalysts; catalytic activity; electrochemistry; evolution; hydrogen; hydrogen production; hydrogen sulfide; nickel; pH; phosphates; protons; quartz crystal microbalance; solar energy; temperature; vapors
Abstract:
... Transition metal sulfides show great promise for applications ranging from catalysis to electrocatalysis to photovoltaics due to their high stability and conductivity. Nickel sulfide, particularly known for its ability to electrochemically reduce protons to hydrogen gas nearly as efficiently as expensive noble metals, can be challenging to produce with certain surface site compositions or morpholo ...
DOI:
10.1021/acs.langmuir.6b02699

3. Evolution of the PVP–Pd Surface Interaction in Nanoparticles through the Case Study of Formic Acid Decomposition

Author:
García-Aguilar, Jaime; Navlani-García, Miriam; Berenguer-Murcia, Ángel; Mori, Kohsuke; Kuwahara, Yasutaka; Yamashita, Hiromi; Cazorla-Amorós, Diego
Source:
Langmuir 2016 v.32 no.46 pp. 12110-12118
ISSN:
1520-5827
Subject:
Fourier transform infrared spectroscopy; X-ray photoelectron spectroscopy; adsorption; case studies; catalysts; catalytic activity; evolution; formic acid; hydrogen production; nanoparticles; palladium; polyvinylpyrrolidone; silica; transmission electron microscopy
Abstract:
... Palladium nanoparticles (Pd NPs) were synthesized by the reduction-by-solvent method using polyvinylpirrolidone (PVP) as capping agent. The nonstatic interaction between PVP and the metallic surface may change the properties of the NPs due to the different possible interactions, through either the O or N atoms of the PVP. In order to analyze these effects and their repercussions in their catalytic ...
DOI:
10.1021/acs.langmuir.6b03149

4. Impact of Compressibility on the Control of Bubble-Pressure Tensiometers

Author:
Chandran Suja, V.; Frostad, J. M.; Fuller, G. G.
Source:
Langmuir 2016 v.32 no.46 pp. 12031-12038
ISSN:
1520-5827
Subject:
bubbles; compressibility; evolution; hysteresis; models; tensiometers; thermodynamics
Abstract:
... An experimental and theoretical investigation is conducted to understand the role of compressibility on the quasi-static expansion and contraction of a bubble that is pinned at the opening of a small capillary. The results show that there are two regimes of expansion and contraction depending on the values of two dimensionless parameters which correspond to a dimensionless volume and maximum capil ...
DOI:
10.1021/acs.langmuir.6b03258