scholarly journals Mechanism of the motion of spherical microparticle induced by a collapsed microbubble

2017 ◽  
Vol 66 (16) ◽  
pp. 164702
Author(s):  
Wei Meng-Ju ◽  
Chen Li ◽  
Wu Tao ◽  
Zhang Hong-Yan ◽  
Cui Hai-Hang
Keyword(s):  
Spherical Microparticle

scholarly journals Micromechanical Punching: A Versatile Method for Non-Spherical Microparticle Fabrication

Polymers ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 83
Author(s):  
Ritika Singh Petersen ◽  
Anja Boisen ◽  
Stephan Sylvest Keller
Keyword(s):  
Drug Delivery ◽  
High Resolution ◽  
Physicochemical Properties ◽  
High Throughput ◽  
Liquid State ◽  
Soft Lithography ◽  
Glycolic Acid ◽  
Thermosetting Polymers ◽  
Spherical Microparticle ◽  
Spherical Microparticles

Microparticles are ubiquitous in applications ranging from electronics and drug delivery to cosmetics and food. Conventionally, non-spherical microparticles in various materials with specific shapes, sizes, and physicochemical properties have been fabricated using cleanroom-free lithography techniques such as soft lithography and its high-resolution version particle replication in non-wetting template (PRINT). These methods process the particle material in its liquid/semi-liquid state by deformable molds, limiting the materials from which the particles and the molds can be fabricated. In this study, the microparticle material is exploited as a sheet placed on a deformable substrate, punched by a robust mold. Drawing inspiration from the macro-manufacturing technique of punching metallic sheets, Micromechanical Punching (MMP) is a high-throughput technique for fabrication of non-spherical microparticles. MMP allows production of microparticles from prepatterned, porous, and fibrous films, constituting thermoplastics and thermosetting polymers. As an illustration of application of MMP in drug delivery, flat, microdisk-shaped Furosemide embedded poly(lactic-co-glycolic acid) microparticles are fabricated and Furosemide release is observed. Thus, it is shown in the paper that Micromechanical punching has potential to make micro/nanofabrication more accessible to the research and industrial communities active in applications that require engineered particles.

The effect of spatial field distribution on two-mode lasing in a spherical microparticle

2003 ◽  
Vol 94 (3) ◽  
pp. 476-480 ◽  
Author(s):  
H. P. Ledneva ◽  
A. V. Korzhov ◽  
L. A. Kotomtseva ◽  
L. G. Astafyeva
Keyword(s):  
Field Distribution ◽  
Spherical Microparticle

scholarly journals On the Positioning Problem of a Microscopic Particle Trapped in Optical Tweezers

2009 ◽  
Vol 2009 ◽  
pp. 1-16
Author(s):  
Carlos Aguilar-Ibañez ◽  
Luis I. Rosas-Soriano
Keyword(s):  
Optical Tweezers ◽  
Thermal Noise ◽  
Lyapunov Method ◽  
Control Strategies ◽  
Optical Trap ◽  
Lyapunov Stability Theory ◽  
Viscous Force ◽  
Random Position ◽  
Spherical Microparticle ◽  
The Stability

We solve the positioning problem of a spherical microparticle trapped by Optical Tweezers, under the assumption that the drag viscous force is presented. To do it, we develop two control strategies for the manipulation of this kind of optical trap. The first control strategy is developed assuming that the damping coefficient is known, while in the second strategy this parameter value is only partially known, which in practice it is more realistic due to the difficulty to estimate it. Both strategies are based on the traditional Lyapunov method in conjunction with the use of a saturation function. The stability analysis of both strategies was carried out by using the standard Lyapunov stability theory. Finally, numerical simulations validate the effectiveness of both control approaches in reducing the random position fluctuations produced by the inherent thermal noise.

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