scholarly journals Fast Active Merging of Microdroplets in Microfluidic Chambers Driven by Photo-Isomerisation of Azobenzene Based Surfactants

Biosensors ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 129
Author(s):  
Zain Hayat ◽  
Nizar Bchellaoui ◽  
Claire Deo ◽  
Rémi Métivier ◽  
Nicolas Bogliotti ◽  
...  
Keyword(s):  
Surface Activity ◽  
Temporal Resolution ◽  
Uv Laser ◽  
Mechanical Motion ◽  
Uv Illumination ◽  
Spatio Temporal ◽  
Fast Control ◽  
Microfluidic Chambers ◽  
First Time ◽  
Azobenzene Groups

In this work, we report on the development of a newly synthesized photoactive reversible azobenzene derived surfactant polymer, which enables active and fast control of the merging of microdroplets in microfluidic chambers, driven by a pulsed UV laser optical stimulus and the well known cis-trans photo-isomerisation of azobenzene groups. We show for the first time that merging of microdroplets can be achieved optically based on a photo-isomerization process with a high spatio-temporal resolution. Our results show that the physical process lying behind the merging of microdroplets is not driven by a change in surface activity of the droplet stabilizing surfactant under UV illumination (as originally expected), and they suggest an original mechanism for the merging of droplets based on the well-known opto-mechanical motion of azobenzene molecules triggered by light irradiation.

scholarly journals A data reduction and compression description for high throughput time-resolved electron microscopy

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Abhik Datta ◽  
Kian Fong Ng ◽  
Deepan Balakrishnan ◽  
Melissa Ding ◽  
See Wee Chee ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Temporal Resolution ◽  
Data Reduction ◽  
Accurate Estimation ◽  
Data Streaming ◽  
Compression Scheme ◽  
Raw Data ◽  
Time Resolved ◽  
Detection And Counting ◽  
Spatio Temporal

AbstractFast, direct electron detectors have significantly improved the spatio-temporal resolution of electron microscopy movies. Preserving both spatial and temporal resolution in extended observations, however, requires storing prohibitively large amounts of data. Here, we describe an efficient and flexible data reduction and compression scheme (ReCoDe) that retains both spatial and temporal resolution by preserving individual electron events. Running ReCoDe on a workstation we demonstrate on-the-fly reduction and compression of raw data streaming off a detector at 3 GB/s, for hours of uninterrupted data collection. The output was 100-fold smaller than the raw data and saved directly onto network-attached storage drives over a 10 GbE connection. We discuss calibration techniques that support electron detection and counting (e.g., estimate electron backscattering rates, false positive rates, and data compressibility), and novel data analysis methods enabled by ReCoDe (e.g., recalibration of data post acquisition, and accurate estimation of coincidence loss).

scholarly journals The Development and Applications of Ultrafast Electron Nanocrystallography

2009 ◽  
Vol 15 (4) ◽  
pp. 323-337 ◽  
Author(s):  
Chong-Yu Ruan ◽  
Yoshie Murooka ◽  
Ramani K. Raman ◽  
Ryan A. Murdick ◽  
Richard J. Worhatch ◽  
...  
Keyword(s):  
Temporal Resolution ◽  
Structural Dynamics ◽  
Atomic Scale ◽  
Energy Redistribution ◽  
Gold Nanocrystals ◽  
Charge Dynamics ◽  
Atomic Structures ◽  
Molecular Scale ◽  
Spatio Temporal ◽  
3D Retrieval

AbstractWe review the development of ultrafast electron nanocrystallography as a method for investigating structural dynamics for nanoscale materials and interfaces. Its sensitivity and resolution are demonstrated in the studies of surface melting of gold nanocrystals, nonequilibrium transformation of graphite into reversible diamond-like intermediates, and molecular scale charge dynamics, showing a versatility for not only determining the structures, but also the charge and energy redistribution at interfaces. A quantitative scheme for 3D retrieval of atomic structures is demonstrated with few-particle (<1,000) sensitivity, establishing this nanocrystallographic method as a tool for directly visualizing dynamics within isolated nanomaterials with atomic scale spatio-temporal resolution.

Investigation of Local Dynamics on the Sub-micron Scale in Organic Blends Using an Ultrafast Confocal Microscope

2010 ◽  
Vol 1270 ◽  
Author(s):  
Giulia Grancini ◽  
Dario Polli ◽  
Jenny Clark ◽  
Tersilla Virgili ◽  
Giulio Cerullo ◽  
...  
Keyword(s):  
Excited State ◽  
Confocal Microscopy ◽  
Polymer Blends ◽  
Spatial Resolution ◽  
Temporal Resolution ◽  
Electronic States ◽  
Pump Probe ◽  
Peculiar Behaviour ◽  
Spatio Temporal ◽  
Probe Spectroscopy

AbstractWe introduce a novel instrument combining femtosecond pump-probe spectroscopy and confocal microscopy for spatio-temporal imaging of excited-state dynamics of phase-separated polymer blends. Phenomena occurring at interfaces between different materials are crucial for optimizing the device performances, but are poorly understood due to the variety of possible electronic states and processes involved and to their complicated dynamics. Our instrument (with 200-fs temporal resolution and 300-nm spatial resolution) provides new insights into the properties of polymer blends, revealing spatially variable photo-relaxation paths and dynamics and highlighting a peculiar behaviour at the interface between the phase-separated domains.

On the possibilities of hard X-ray imaging with high spatio-temporal resolution using polychromatic synchrotron radiation

2010 ◽  
Vol 18 (4) ◽  
pp. 429-441 ◽  
Author(s):  
A. Rack ◽  
F. Garcia-Moreno ◽  
C. Schmitt ◽  
O. Betz ◽  
A. Cecilia ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Temporal Resolution ◽  
X Ray ◽  
X Ray Imaging ◽  
Spatio Temporal

Video Synthesis with High Spatio-temporal Resolution Using Spectral Fusion

2006 ◽  
pp. 683-690 ◽  
Author(s):  
Kiyotaka Watanabe ◽  
Yoshio Iwai ◽  
Hajime Nagahara ◽  
Masahiko Yachida ◽  
Toshiya Suzuki
Keyword(s):  
Temporal Resolution ◽  
Spatio Temporal
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