Study On Carbon Tetrachloride As Selective Carrier Role For Particle Manipulation By Optical Tweezers

Optical tweezers is a gradient force trap formed by the interaction of high convergent laser beam and particles,and it is a kind of micro-control technology without damage and contact.Optical tweezers and multi-disciplinary cross-fusion build a bridge,showing its unique and irreplaceable role,in biology,soft matter colloid science and micro-nano-science and other fields are widely used.Optical tweezers can overcome the effect of particles in the solution,such as gravity,Brownian and dragging force,can also selectively capture the target particles,and control a single or multiple particles at the same time.Holographic optical tweezers can be used to accurately control multiple particles,but its conveying distance is limited and the system is complex,and the use of optical fiber evanescent the dead field can capture a large number of particles,but also lack of selectivity.In this paper,the method of carrier transport and the selective loading,transportation and unloading of particles by single optical tweezers tool can realize the continuous,stable and long-distance transportation of multiple particles selectively,and greatly reduce the complexity of array optical tweezers system and control.The main research contents of this paper include:(1)Based on the theoretical model of geometric optics and T matrix,the optical trap force of particles in the solution is analyzed theoretically,and the key parameters such as numerical aperture and relative refractive index,which affect the light trap force,are calculated and evaluated.The results show that the larger the numerical aperture and the larger the relative refractive index,the greater the Light Trap force,the higher the capture efficiency.(2)The effects of particle size,solution concentration and laser power on the stable capture performance of optical tweezers were studied experimentally,and the stability of single-tweezers to control particles was verified.(3)Using the free vesicles formed by carbon tetrachloride in the mixed solution as the carrier,the single optical tweezers control technology is used to realize the stable,continuous and long Cheng of multiple particles.The influence factors such as small bubble size,particle number and laser power are analyzed.The results show that the larger the size of the vesicles,the better the transport performance,and the increase of the carrying capacity of the vesicles in the range of carrying capacity that the vesicles can withstand,which reduces the relative transport speed.(4)The first study found that polystyrene microspheres appeared in the mixed solution of carbon tetrachloride double chain self-aggregation arrangement,combined with the control experiment of optical tweezers to prove the liquid molecular reconstruction and dynamic change characteristics in the solution.It is found that the viscosity of the micro-region part of the solution is very different by using optical tweezers to control the polystyrene microspheres in the suspended state.At the same time,the optical tweezers control the flexible double-chain arrangement of the microspheres,and change its layout shape,found that the entire double-chain arrangement of microspheres due to each other's interaction force,will follow the end of the Microsphere movement together,indicating that there is a strong attraction between the microspheres.Carbon tetrachloride presents multi-mode and versatility in the study of the action of light tweezers to control particles,which not only shows the colorful motion forms in the microscopic microcosm,but also accurately observes and calculates the kinematics behavior process of individual particles through the manipulation of particle motion by optical tweezers,and expands the application of optical tweezers in the study of the properties of particle level dispersion system.