Activity-induced instability of phonons in 1D microfluidic crystals

Soft Matter ◽  
2018 ◽  
Vol 14 (6) ◽  
pp. 945-950 ◽  
Author(s):  
Alan Cheng Hou Tsang ◽  
Michael J. Shelley ◽  
Eva Kanso
Keyword(s):  
Vibrational Modes ◽  
Acoustic Phonons ◽  
One Dimensional ◽  
Active Particles ◽  
Flow Channels ◽  
Microfluidic Flow ◽  
Collective Vibrational Modes

One-dimensional crystals of active particles in microfluidic flow channels exhibit collective vibrational modes reminiscent of acoustic ‘phonons’.

scholarly journals Honey, I shrunk the bubbles: microfluidic vacuum shrinkage of lipid-stabilized microbubbles

2021 ◽  
Author(s):  
Vaskar Gnyawali ◽  
Byeong-Ui Moon ◽  
Jennifer Kieda ◽  
Raffi Karshafian ◽  
Michael C. Kolios ◽  
...  
Keyword(s):  
Contrast Agents ◽  
Ultrasound Imaging ◽  
Scale Up ◽  
Ultrasound Contrast Agents ◽  
Simple Approach ◽  
Vacuum Pressure ◽  
Flow Channels ◽  
Ultrasound Contrast ◽  
Microfluidic Flow ◽  
Microfluidic Technique

We present a microfluidic technique that shrinks lipidstabilized microbubbles from O(100) to O(1) µm in diameter–the size that is desirable in applications as ultrasound contrast agents. We achieve microbubble shrinkage by utilizing vacuum channels that are adjacent to the microfluidic flow channels to extract air from the microbubbles. We tune a single parameter, the vacuum pressure, to accurately control the final microbubble size. Finally, we demonstrate that the resulting O(1) µm diameter microbubbles have similar stability to microfluidics generated microbubbles that are not exposed to vacuum shrinkage. We anticipate that, with additional scale-up, this simple approach to shrink microbubbles generated microfluidically will be desirable in ultrasound imaging and therapeutics applications.

scholarly journals Effect of pH waves on capacitive charging in microfluidic flow channels

Ionics ◽  
2014 ◽  
Vol 20 (9) ◽  
pp. 1315-1322 ◽  
Author(s):  
Susan H. Roelofs ◽  
Michiel van Soestbergen ◽  
Mathieu Odijk ◽  
Jan C. T. Eijkel ◽  
Albert van den Berg
Keyword(s):  
Effect Of Ph ◽  
Flow Channels ◽  
Microfluidic Flow ◽  
Capacitive Charging

Active particles under confinement and effective force generation among surfaces

Soft Matter ◽  
2018 ◽  
Vol 14 (44) ◽  
pp. 9044-9054 ◽  
Author(s):  
Lorenzo Caprini ◽  
Umberto Marini Bettolo Marconi
Keyword(s):  
Steady State ◽  
Thermal Noise ◽  
Active Suspension ◽  
Force Generation ◽  
One Dimensional ◽  
Effective Force ◽  
Active Particles ◽  
Geometric Confinement

We consider the effect of geometric confinement on the steady-state properties of a one-dimensional active suspension subject to thermal noise.

Free Vibration Response of Thin and Thick Nonhomogeneous Shells by Refined One-Dimensional Analysis

2014 ◽  
Vol 136 (6) ◽  
Author(s):  
Alberto Varello ◽  
Erasmo Carrera
Keyword(s):  
Finite Element ◽  
Free Vibration ◽  
Cross Section ◽  
Vibration Analysis ◽  
Plane Deformation ◽  
Free Vibration Analysis ◽  
Higher Order ◽  
Variable Order ◽  
Vibrational Modes ◽  
One Dimensional

The free vibration analysis of thin- and thick-walled layered structures via a refined one-dimensional (1D) approach is addressed in this paper. Carrera unified formulation (CUF) is employed to introduce higher-order 1D models with a variable order of expansion for the displacement unknowns over the cross section. Classical Euler–Bernoulli (EBBM) and Timoshenko (TBM) beam theories are obtained as particular cases. Different kinds of vibrational modes with increasing half-wave numbers are investigated for short and relatively short cylindrical shells with different cross section geometries and laminations. Numerical results of natural frequencies and modal shapes are provided by using the finite element method (FEM), which permits various boundary conditions to be handled with ease. The analyses highlight that the refinement of the displacement field by means of higher-order terms is fundamental especially to capture vibrational modes that require warping and in-plane deformation to be detected. Classical beam models are not able to predict the realistic dynamic behavior of shells. Comparisons with three-dimensional elasticity solutions and solid finite element solutions prove that CUF provides accuracy in the free vibration analysis of even short, nonhomogeneous thin- and thick-walled shell structures, despite its 1D approach. The results clearly show that bending, radial, axial, and also shell lobe-type modes can be accurately evaluated by variable kinematic 1D CUF models with a remarkably lower computational effort compared to solid FE models.

Individual and collective vibrational modes of nanostructures studied by picosecond ultrasonics

Ultrasonics ◽  
2006 ◽  
Vol 44 ◽  
pp. e1289-e1294 ◽  
Author(s):  
T. Bienville ◽  
J.F. Robillard ◽  
L. Belliard ◽  
I. Roch-Jeune ◽  
A. Devos ◽  
...  
Keyword(s):  
Vibrational Modes ◽  
Collective Vibrational Modes ◽  
Picosecond Ultrasonics
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