Coating laser microspheres with homogeneous low density foams

Coudeville, A.; Eyharts, P.; Perrine, J. P.; Rey, L.; Rouillard, Roger

doi:10.1116/1.570898

Cited by 19 publications

(8 citation statements)

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“…The rigid aquagels collapse into dense materials, however, when simply dried in air. Low density starch foams can be made if the water phase is removed by freeze-drying as described earlier for dextran solutions (42,50). Large pore sizes result when the aquagels are frozen slowly and freeze-dried (50).…”

Section: Starch-based Microcellular Foamsmentioning

confidence: 99%

“…Removal of the solvent droplets from the matrix results in an open cell structure where the voids are replicas of the solvent droplets (41). One of the first reported microcellullar foams made using this technique was made using solutions of dextran in water (42). The solutions were quickly frozen and freeze-dried.…”

Section: Formation Of Polymeric Foamsmentioning

confidence: 99%

“…The cell size is a direct replica of nucleated ice particles (43). Small crystals are possible with rapid freezing techniques and the use of proper ice nucleators (42)(43). The walls of cells from freeze-dried starch gels are continuous and sheet-like just as was obtained with starch foams prepared by extrusion or puffing (compare figure 2 e and f) (50).…”

Section: Starch-based Macrocellular Foamsmentioning

confidence: 99%

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Microcellular Starch-Based Foams

Glenn

Miller

Irving

1996

ACS Symposium Series

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Interest has been growing in the development of a new class of foams called microcellular foams. These foams have extremely small cells (<10 μm) and possess unique and useful properties. This chapter discusses some of the important methods for making macro -and microcellular polymeric foams and discusses their structural, physical and mechanical properties. Particular emphasis is focused on starch-based foams. Starch can be extrusion processed into foams having relatively large cells. Microcellular starch-based foams can be made using methods originally developed for other polymeric materials. These foams are white, opaque, have densities ranging from 0.10 g/cm 3 to 0.32 g/cm 3 , compressive strengths of 0.22 MPa to 0.97 MPa, and moduli of elasticity from 5.1 MPa to 33 MPa. The microcellular starch-based foams have low thermal conductivity (0.024 W/mK to 0.036 W/mK), large pore volume (0.17 to 0.63 cm 3 /g) and large total surface areas (50 to 145 m 2 /g).Starch is the principal carbohydrate storage biopolymer of higher plants (biopolymers). It is the principal constituent of wheat endosperm (64% to 74%) and other cereal grains (7) and is a valuable source of food. Starch is a mixture of two glucan polymers, amylose and amylopectin. Amylose is a straight chain polymer of a-D-glucopyranosyl units linked by (l->4) bonds and amylopectin is a polymer of a-D-glucopyranosyl units linked by (l->4) bonds with (1~>6) branches (2-4). Typical starches isolated from wheat and corn consist of approximately 28% amylose and 72% amylopectin (5-7). However, breeding programs have developed commercial varieties of corn that produce starches with amylose contents ranging from 0.8% to 80% (8).Starch is the lowest priced and most abundant worldwide food commodity (9).

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Section: Starch-based Microcellular Foamsmentioning

confidence: 99%

Section: Formation Of Polymeric Foamsmentioning

confidence: 99%

Section: Starch-based Macrocellular Foamsmentioning

confidence: 99%

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Microcellular Starch-Based Foams

Glenn

Miller

Irving

1996

ACS Symposium Series

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“…Water-Soluble Polymer/Water Systems Coudeville et al [19] first described a method of producing a lowdensity, microcellular foam for fusion targets by a rapid quenching technique. This method involved the spinodal decomposition of a room temperature dextran/water solution by rapidly freezing the solution in an isopentane bath at 163 ° K. Incorporation of a cosolvent of dioxane in the system prevented the expansion and cracking of the resultant cooled dextran/water-ice structure.…”

Section: Thermally Induced Spinodal Decompositionmentioning

confidence: 99%

Polymer-Solvent Phase Separation as a Route to Low Density, Microcellular Plastic Foams

Young

1987

Journal of Cellular Plastics

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“…The foam consisted of (C 5 H,2)n and its thickness and density were 100 J.lm and 122 mglcc, respectively. 3 The pellet compression experiment was performed with a phosphate glass laser system GEKKO-IV.4 The four 1.053-J.lm laser beams were focused onto the target from the tetrahedrally symmetric directions by f 11.15 aspheric lenses. The totallaserenergy was 160Jina 120-pspulse.…”

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confidence: 99%