scholarly journals Mimicking coalescence using a pressure-controlled dynamic thin film balance

Soft Matter ◽  
2020 ◽  
Vol 16 (41) ◽  
pp. 9410-9422
Author(s):  
Emmanouil Chatzigiannakis ◽  
Peter Veenstra ◽  
Dick ten Bosch ◽  
Jan Vermant
Keyword(s):  
Thin Film ◽  
Free Standing ◽  
Pressure Profiles ◽  
Film Balance ◽  
Pressure Controlled

A novel modified version of the thin film balance is introduced, which allows the application of complex pressure profiles in free-standing films and the study of film dynamics during both drainage and retraction.

scholarly journals Fabrication and electromechanical characterization of free-standing asymmetric membranes

2020 ◽  
Author(s):  
P. Liu ◽  
O. Zabala-Ferrera ◽  
P. J. Beltramo
Keyword(s):  
Thin Film ◽  
Cell Membrane ◽  
Phospholipid Bilayer ◽  
Asymmetric Distribution ◽  
Free Standing ◽  
Asymmetric Membranes ◽  
The Future ◽  
Film Balance ◽  
Electromechanical Characterization

ABSTRACTAll biological cell membranes maintain an electric transmembrane potential of around 100 mV, due in part to an asymmetric distribution of charged phospholipids across the membrane. This asymmetry is crucial to cell health and physiological processes such as intracell signaling, receptor-mediated endocytosis, and membrane protein function. Experimental artificial membrane systems incorporate essential cell membrane structures, such as the phospholipid bilayer, in a controllable manner where specific properties and processes can be isolated and examined. Here, we describe a new approach to fabricate and characterize planar, free-standing, asymmetric membranes and use it to examine the effect of headgroup charge on membrane stiffness. The approach relies on a thin film balance used to form a freestanding membrane by adsorbing aqueous phase lipids to an oil-water interface and subsequently thinning the oil to form a bilayer. We validate this lipid-in-aqueous approach by analyzing the thickness and compressibility of symmetric membranes with varying zwitterionic DOPC and anionic DOPG content as compared to previous lipid-in-oil methods. We find that as the concentration of DOPG increases, membranes become thicker and stiffer. By controlling the lipid composition in the aqueous compartments on either side of the oil within the thin film balance, asymmetric membranes are then examined. Membrane compositional asymmetry is qualitatively demonstrated using a fluorescence quenching assay and quantitatively characterized through voltage-dependent capacitance measurements. Stable asymmetric membranes with DOPC on one side and DOPC/DOPG mixtures on the other were created with transmembrane potentials ranging from 10 to 25 mV. Introducing membrane charge asymmetry also increases the stiffness of the membrane. These initial successes demonstrate a viable pathway to quantitatively characterize asymmetric bilayers that can be extended to accommodate more complex membrane processes in the future.SIGNIFICANCEA defining characteristic of the cell membrane is asymmetry in phospholipid composition between the interior and exterior bilayer leaflet. Although several methods have been used to artificially create membranes with asymmetry, there has not been extensive characterization of the impact of asymmetry on membrane material properties. Here, a technique to fabricate free-standing asymmetric membranes is developed which facilitates the visualization and electromechanical characterization of the bilayer. Asymmetry in anionic phospholipid concentration is quantified by measurements of membrane capacitance at varying voltages, which also allows for determination of the membrane compressibility. This method represents an advance in the development of artificial biomembranes by reliably creating phospholipid bilayers with asymmetry and facilitates the interrogation of more complex biological processes in the future.

A Self‐Limited Free‐Standing Sulfide Electrolyte Thin Film for All‐Solid‐State Lithium Metal Batteries

2021 ◽  
pp. 2101985
Author(s):  
Gao‐Long Zhu ◽  
Chen‐Zi Zhao ◽  
Hong‐Jie Peng ◽  
Hong Yuan ◽  
Jiang‐Kui Hu ◽  
...  
Keyword(s):  
Thin Film ◽  
Solid State ◽  
Lithium Metal ◽  
Free Standing ◽  
Lithium Metal Batteries

The Elastic Moduli of Silver Thin Films Measured with a New Microtensile Tester

1991 ◽  
Vol 239 ◽  
Author(s):  
J. Ruud ◽  
D. Josell ◽  
A. L. Greer ◽  
F. Spaepen
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Diffraction Grating ◽  
Strain Measurement ◽  
Elastic Moduli ◽  
Two Dimensional ◽  
Bulk Crystals ◽  
Free Standing ◽  
Tensile Direction ◽  
Silver Thin Films

ABSTRACTA new design for a thin film microtensile tester is presented. The strain is measured directly on the free-standing thin film from the displacement of laser spots diffracted from a thin grating applied to its surface by photolithography. The diffraction grating is two-dimensional, allowing strain measurement both along and transverse to the tensile direction. In principle, both Young's modulus and Poisson's ratio of a thin film can be determined. Ag thin films with strong <111> texture were tested. The measured Young moduli agreed with those measured on bulk crystals, but the measured Poisson ratios were low, most likely due to slight transverse folding of the film that developed during the test.

Image stresses in a free-standing thin film

1999 ◽  
Vol 7 (5) ◽  
pp. 781-793 ◽  
Author(s):  
A Hartmaier ◽  
M C Fivel ◽  
G R Canova ◽  
P Gumbsch
Keyword(s):  
Thin Film ◽  
Free Standing

Preparation of a two-dimensional flexible MnO2/graphene thin film and its application in a supercapacitor

2016 ◽  
Vol 4 (27) ◽  
pp. 10618-10626 ◽  
Author(s):  
Zhimin Li ◽  
Yufeng An ◽  
Zhongai Hu ◽  
Ning An ◽  
Yadi Zhang ◽  
...  
Keyword(s):  
Thin Film ◽  
Spin Coating ◽  
Hydrothermal Process ◽  
Graphene Film ◽  
Two Dimensional ◽  
Supercapacitor Electrode ◽  
Free Standing

A novel two-dimensional (2D) free standing and flexible MnO2/graphene film (MGF) supercapacitor electrode is successfully fabricated by a spin-coating and hydrothermal process.

scholarly journals Free-standing ferroelectric multilayers: Crossover from thin-film to bulk behavior

2011 ◽  
Vol 110 (7) ◽  
pp. 074116 ◽  
Author(s):  
S. Prokhorenko ◽  
N. A. Pertsev
Keyword(s):  
Thin Film ◽  
Free Standing ◽  
Bulk Behavior

Performance of a 1.2 kWp thin-film free-standing grid-connected photovoltaic system at SIRIM berhad

2015 ◽  
Author(s):  
Adila Athirah Abdul Ghani ◽  
Mohamad Zhafran Hussin ◽  
Shahril Irwan Sulaiman ◽  
Mohd Faisal Zulkapli
Keyword(s):  
Thin Film ◽  
Photovoltaic System ◽  
Free Standing

Free-standing membranes from the chemical exfoliation of mesoporous amorphous titania thin film

2021 ◽  
Author(s):  
Victor Malgras ◽  
Joel Henzie ◽  
Yoshitaka Matsushita ◽  
Yoshiyuki Sugahara ◽  
Yusuke Yamauchi
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Free Standing ◽  
Amorphous Titania ◽  
Titania Thin Film ◽  
Chemical Exfoliation

Thin films are typically bound to their substrate, limiting their integration on rough, porous, curved or chemically/thermally sensitive surfaces. Instead of employing tedious and expensive back-etching processes, certain chemical routes...

Magnetoelectric effect in free-standing multiferroic thin film

2019 ◽  
Vol 787 ◽  
pp. 1128-1135 ◽  
Author(s):  
Sridevi Meenachisundaram ◽  
Hironori Mori ◽  
Takahiko Kawaguchi ◽  
Parthasarathi Gangopadhyay ◽  
Naonori Sakamoto ◽  
...  
Keyword(s):  
Thin Film ◽  
Magnetoelectric Effect ◽  
Free Standing
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