Photonic Crystals from Monodisperse Lanthanide-Hydroxide-at-Silica Core/Shell Colloidal Spheres

2007 ◽  
Vol 19 (4) ◽  
pp. 577-580 ◽  
Author(s):  
Y.-S. Lin ◽  
Y. Hung ◽  
H.-Y. Lin ◽  
Y.-H. Tseng ◽  
Y.-F. Chen ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Core Shell ◽  
Colloidal Spheres ◽  
Silica Core ◽  
Lanthanide Hydroxide

Fabrication of Monodispersed, Multilayered Silica-Y:Eu-Silica Core-Shell Particles and Their Photonic Crystals

2009 ◽  
Vol 42 (1) ◽  
pp. 47-50 ◽  
Author(s):  
Yoshio Kobayashi ◽  
Jun-ichi Imai ◽  
Daisuke Nagao ◽  
Mikio Konno
Keyword(s):  
Photonic Crystals ◽  
Core Shell ◽  
Silica Core ◽  
Shell Particles

Preparation of Zirconia Silica Core Shell Microspheres and Its Application for Highly Specific Phospholipids Enrichment

2013 ◽  
Vol 41 (8) ◽  
pp. 1214
Author(s):  
Kai YAO ◽  
Yun XUE ◽  
Qian WU ◽  
Jing LI ◽  
Yan WANG ◽  
...  
Keyword(s):  
Core Shell ◽  
Silica Core

scholarly journals Amyloid fibril-directed synthesis of silica core–shell nanofilaments, gels, and aerogels

2019 ◽  
Vol 116 (10) ◽  
pp. 4012-4017 ◽  
Author(s):  
Yiping Cao ◽  
Sreenath Bolisetty ◽  
Gianna Wolfisberg ◽  
Jozef Adamcik ◽  
Raffaele Mezzenga
Keyword(s):  
Amyloid Fibril ◽  
Functional Materials ◽  
Building Blocks ◽  
Inorganic Materials ◽  
Core Shell ◽  
Shear Stresses ◽  
Bending Rigidity ◽  
Widespread Application ◽  
Nonmonotonic Dependence ◽  
Silica Core

Amyloid fibrils have evolved from purely pathological materials implicated in neurodegenerative diseases to efficient templates for last-generation functional materials and nanotechnologies. Due to their high intrinsic stiffness and extreme aspect ratio, amyloid fibril hydrogels can serve as ideal building blocks for material design and synthesis. Yet, in these gels, stiffness is generally not paired by toughness, and their fragile nature hinders significantly their widespread application. Here we introduce an amyloid-assisted biosilicification process, which leads to the formation of silicified nanofibrils (fibril–silica core–shell nanofilaments) with stiffness up to and beyond ∼20 GPa, approaching the Young’s moduli of many metal alloys and inorganic materials. The silica shell endows the silicified fibrils with large bending rigidity, reflected in hydrogels with elasticity three orders of magnitude beyond conventional amyloid fibril hydrogels. A constitutive theoretical model is proposed that, despite its simplicity, quantitatively interprets the nonmonotonic dependence of the gel elasticity upon the filaments bundling promoted by shear stresses. The application of these hybrid silica–amyloid hydrogels is demonstrated on the fabrication of mechanically stable aerogels generated via sequential solvent exchange, supercriticalCO2removal, and calcination of the amyloid core, leading to aerogels of specific surface area as high as 993m2/g, among the highest values ever reported for aerogels. We finally show that the scope of amyloid hydrogels can be expanded considerably by generating double networks of amyloid and hydrophilic polymers, which combine excellent stiffness and toughness beyond those of each of the constitutive individual networks.

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