Formation of synthetic structures with micron size silica beads using optical tweezer

Erenso, Daniel; Shul’man, A.; Curtis, Jeremy A.; Elrod, Samuel

doi:10.1080/09500340601183664

Cited by 11 publications

(10 citation statements)

References 23 publications

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“…There is no equivalent bonding in the case of the polystyrene structures. A similar approach to directed assembly was demonstrated recently by Erenso et al [11] who used NaCl and glycol to adjust the colloidal interactions between the spheres. In that work, the concentrations of NaCl and glycol were the same throughout the sample cell, and had to be carefully tuned to allow the silica spheres to adhere to each other before becoming permanently attached to the glass cell wall.…”

Section: Discussionmentioning

confidence: 97%

“…This is due to electrostatic repulsion resulting from the formation of ionic double layers at the surfaces of the spheres, which is sufficient to overcome any van der Waals attraction. As is well known, the strength of the double layer repulsion may be reduced by the addition of salt to the solution [20], as exploited by Erenso et al [11] in creating 2-dimensional structures. However, as the size of structure being constructed increases, it becomes important to gain greater control over the interactions.…”

Section: Methodsmentioning

confidence: 94%

“…This idea was first demonstrated by Garcia-Santamaria et al who used a micromanipulator within a SEM to construct 3-dimensional arrays of spheres [10]. A similar approach that showed assembly of 2-dimensional structures using optical tweezers was recently published [11]. In that work, the electrostatic double-layer repulsion between the silica beads was reduced by adding salt to the solution until the particles adhered.…”

Section: Introductionmentioning

confidence: 95%

See 2 more Smart Citations

Constructing 3D crystal templates for photonic band gap materials using holographic optical tweezers

et al. 2008

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Abstract:A simple and robust method is presented for the construction of 3-dimensional crystals from silica and polystyrene microspheres. The crystals are suitable for use as templates in the production of threedimensional photonic band gap (PBG) materials. Manipulation of the microspheres was achieved using a dynamic holographic assembler (DHA) consisting of computer controlled holographic optical tweezers. Attachment of the microspheres was achieved by adjusting their colloidal interactions during assembly. The method is demonstrated by constructing a variety of 3-dimensional crystals using spheres ranging in size from 3 µm down to 800 nm. A major advantage of the technique is that it may be used to build structures that cannot be made using self-assembly. This is illustrated through the construction of crystals in which line defects have been deliberately included, and by building simple cubic structures.

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Section: Discussionmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 95%

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Constructing 3D crystal templates for photonic band gap materials using holographic optical tweezers

et al. 2008

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“…Since the first time a laser tweezer (LT) was introduced by Ashkin [1] over three decades ago, it has been widely used for the micromanipulation of living objects for both biological and biomedical applications [2][3][4][5][6][7], as well as for nonliving objects to construct specific microstructures for optoelectronic applications [8]. An LT is an intensity gradient trap formed by focusing a highly collimated laser beam used to manipulate dielectric objects as small as an atom and as large as 100 micrometers by creating small forces in the order of piconewtons.…”

Section: Introductionmentioning

confidence: 99%

Application of a laser trap as a viscometer

et al. 2013

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A laser tweezer (LT) along with advanced imaging techniques has been widely applied to manipulate and study living as well as nonliving microscopic objects. In this study we present yet another novel application of LTs for a precise measurement of the viscosities of fluids in a micro-volume flow. We have demonstrated this novel application by measuring the viscosity of a fetal bovine serum (FBS) using a LT constructed from a single intensity gradient laser trap. By calibrating the LT using dielectric silica micro-beads in a fluid with a known viscosity, specifically water, and by suspending same size of silica beads in the FBS and trapping with the same trap, we have determined the viscosity of the FBS at different temperatures. We have used the relationship between the trapping and Stoke's drag force for a constant drag speed to determine the viscosity. We have also analyzed the viscosities determined in comparison with corresponding viscosities measured using an Ostwald viscometer.

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“…The elastic deformability of the RBCs has been widely studied using different devices, one of which is a Laser tweezer (LT) [2]. LT is a novel optical device capable of conveniently trapping and manipulating living [3][4][5] or non-living [6] dielectric particles whose dimensions range from tens of nanometers to tens of microns. Elastic deformability studies of the RBCs by LTs have been used to measure the integrity of RBCs after refrigeration [7] and the efficacy for RBCs extracted from a normal individual and transfused in patient with SCA [8].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Elasticity of Erythrocytes in Different Physiological Fluids by Laser Traps

Barnes¹,

Shul’man²,

Farone³

et al. 2013

OPJ

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In the study of the mechanical properties of the erythrocytes (red blood cells-RBCs) the blood sample is commonly diluted in fluids that do not compromise the integrity of the cells. Fetal bovine serum (FBS), newborn bovine serum (NBBS), and phosphate buffer (PBS) solution with a concentration that can provide the right osmotic pressure are fluids commonly used to dilute the blood samples in such studies. Here we have presented the effect of these fluids on the elastic properties of the RBCs that we studied using laser traps. Two laser traps are directly used to trap and deform the cell by exerting a force distributed on the entire cell. The relative changes in size of the cell are studied as a function of the applied force to investigate any effects on the mechanical deformability of RBCs when the cells are suspended in these fluids. The results have shown that the elasticity of the RBCs in the NBBS is not statistically different from the elasticity of the cells in the PBS solution; however the results for the elasticity of the cells in FBS are found to be significantly higher.

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Formation of synthetic structures with micron size silica beads using optical tweezer

Cited by 11 publications

References 23 publications

Constructing 3D crystal templates for photonic band gap materials using holographic optical tweezers

Constructing 3D crystal templates for photonic band gap materials using holographic optical tweezers

Application of a laser trap as a viscometer

Assessment of the Elasticity of Erythrocytes in Different Physiological Fluids by Laser Traps

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