scholarly journals Fluoropolymer-Containing Opals and Inverse Opals by Melt-Shear Organization

Molecules ◽  
2019 ◽  
Vol 24 (2) ◽  
pp. 333 ◽  
Author(s):  
Julia Kredel ◽  
Christian Dietz ◽  
Markus Gallei
Keyword(s):  
Optical Properties ◽  
Optical Sensors ◽  
Matrix Material ◽  
Functional Materials ◽  
Building Blocks ◽  
Core Shell ◽  
Inverse Opal ◽  
Shell Material ◽  
Inverse Opals ◽  
Structural Colors

The preparation of highly ordered colloidal architectures has attracted significant attention and is a rapidly growing field for various applications, e.g., sensors, absorbers, and membranes. A promising technique for the preparation of elastomeric inverse opal films relies on tailored core/shell particle architectures and application of the so-called melt-shear organization technique. Within the present work, a convenient route for the preparation of core/shell particles featuring highly fluorinated shell materials as building blocks is described. As particle core materials, both organic or inorganic (SiO2) particles can be used as a template, followed by a semi-continuous stepwise emulsion polymerization for the synthesis of the soft fluoropolymer shell material. The use of functional monomers as shell-material offers the possibility to create opal and inverse opal films with striking optical properties according to Bragg’s law of diffraction. Due to the presence of fluorinated moieties, the chemical resistance of the final opals and inverse opals is increased. The herein developed fluorine-containing particle-based films feature a low surface energy for the matrix material leading to good hydrophobic properties. Moreover, the low refractive index of the fluoropolymer shell compared to the core (or voids) led to excellent optical properties based on structural colors. The herein described fluoropolymer opals and inverse opals are expected to pave the way toward novel functional materials for application in fields of coatings and optical sensors.

scholarly journals Structural and optical properties of amorphous Si–Ge–Te thin films prepared by combinatorial sputtering

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
C. Mihai ◽  
F. Sava ◽  
I. D. Simandan ◽  
A. C. Galca ◽  
I. Burducea ◽  
...  
Keyword(s):  
Optical Properties ◽  
Data Storage ◽  
Optical Sensors ◽  
Material Selection ◽  
Functional Materials ◽  
Stability Study ◽  
Optical Data Storage ◽  
Optical Data ◽  
Structural And Optical Properties ◽  
Topological Constraint

AbstractThe lack of order in amorphous chalcogenides offers them novel properties but also adds increased challenges in the discovery and design of advanced functional materials. The amorphous compositions in the Si–Ge–Te system are of interest for many applications such as optical data storage, optical sensors and Ovonic threshold switches. But an extended exploration of this system is still missing. In this study, magnetron co-sputtering is used for the combinatorial synthesis of thin film libraries, outside the glass formation domain. Compositional, structural and optical properties are investigated and discussed in the framework of topological constraint theory. The materials in the library are classified as stressed-rigid amorphous networks. The bandgap is heavily influenced by the Te content while the near-IR refractive index dependence on Ge concentration shows a minimum, which could be exploited in applications. A transition from a disordered to a more ordered amorphous network at 60 at% Te, is observed. The thermal stability study shows that the formed crystalline phases are dictated by the concentration of Ge and Te. New amorphous compositions in the Si–Ge–Te system were found and their properties explored, thus enabling an informed and rapid material selection and design for applications.

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.

Silica–titania hybrids for structurally robust inverse opals with controllable refractive index

2020 ◽  
Vol 8 (1) ◽  
pp. 109-116
Author(s):  
Katherine R. Phillips ◽  
Tanya Shirman ◽  
Michael Aizenberg ◽  
Grant T. England ◽  
Nicolas Vogel ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Inverse Opal ◽  
Structural And Optical Properties ◽  
Inverse Opals ◽  
Silica And Titania

Combining silica and titania precursors at varying ratios yields uniform hybrid inverse opal structures with adjustable structural and optical properties.

scholarly journals Smart polymer inverse-opal photonic crystal films by melt-shear organization for hybrid core–shell architectures

2015 ◽  
Vol 3 (10) ◽  
pp. 2204-2214 ◽  
Author(s):  
C. G. Schäfer ◽  
T. Winter ◽  
S. Heidt ◽  
C. Dietz ◽  
T. Ding ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photonic Crystal ◽  
Core Shell ◽  
Inverse Opal ◽  
Stimuli Responsive ◽  
Large Area ◽  
Smart Polymer ◽  
Stimuli Responsive Polymers ◽  
Responsive Polymers ◽  
Crystal Films

Large-area inverse opal structures based on stimuli-responsive polymers with reversibly switchable and distinct optical properties are prepared by melt-shear organization.

scholarly journals Bio-inspired self-healing structural color hydrogel

2017 ◽  
Vol 114 (23) ◽  
pp. 5900-5905 ◽  
Author(s):  
Fanfan Fu ◽  
Zhuoyue Chen ◽  
Ze Zhao ◽  
Huan Wang ◽  
Luoran Shang ◽  
...  
Keyword(s):  
Functional Materials ◽  
Composite Hydrogel ◽  
Covalent Attachment ◽  
Structural Color ◽  
Inverse Opal ◽  
Self Healing ◽  
Structural Colors ◽  
Inverse Opal Structure ◽  
Reversible Covalent ◽  
The Stability

Biologically inspired self-healing structural color hydrogels were developed by adding a glucose oxidase (GOX)- and catalase (CAT)-filled glutaraldehyde cross-linked BSA hydrogel into methacrylated gelatin (GelMA) inverse opal scaffolds. The composite hydrogel materials with the polymerized GelMA scaffold could maintain the stability of an inverse opal structure and its resultant structural colors, whereas the protein hydrogel filler could impart self-healing capability through the reversible covalent attachment of glutaraldehyde to lysine residues of BSA and enzyme additives. A series of unprecedented structural color materials could be created by assembling and healing the elements of the composite hydrogel. In addition, as both the GelMA and the protein hydrogels were derived from organisms, the composite materials presented high biocompatibility and plasticity. These features of self-healing structural color hydrogels make them excellent functional materials for different applications.

Eccentric 1-D magnetic core–shell photonic crystal balls: ingenious fabrication and distinctive optical properties

2018 ◽  
Vol 6 (16) ◽  
pp. 4531-4540 ◽  
Author(s):  
Huiru Ma ◽  
Yali Tan ◽  
Jie Cao ◽  
Sheron Chuanyu Lian ◽  
Ke Chen ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Optical Properties ◽  
Photonic Crystal ◽  
Magnetic Core ◽  
Band Gaps ◽  
Core Shell ◽  
Photonic Band Gaps ◽  
Structural Colors ◽  
Photonic Band ◽  
The Magnetic Field

Eccentric 1-D photonic crystal balls fabricated by light intensity-guided morphology-controllable polymerization demonstrate self-displaying structural colors and dynamically tunable bi-photonic band-gaps by the direction and intensity of the magnetic field.

Fluorescent magnetic ionic liquids with multi-responses to temperature, humidity and organic vapors

2021 ◽  
Author(s):  
Aixin Song ◽  
Zhaohui Huang ◽  
Mengjiao Yi ◽  
Yue Xu ◽  
Ping Qi ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ionic Liquids ◽  
Functional Materials ◽  
Building Blocks ◽  
Organic Vapors ◽  
Magnetic Ionic Liquids

Organic manganese(II) halides have become attractive building blocks in constructing luminescent functional materials due to their excellent optical properties. Here we presented three magnetic fluorescent ionic liquids (ILs) with [MnClxBry]n‒...

scholarly journals Embedding Photoacids into Polymer Opal Structures: Synergistic Effects on Optical and Stimuli-Responsive Features

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7350
Author(s):  
Martin Bitsch ◽  
Anna Katharina Boehm ◽  
Alexander Grandjean ◽  
Gregor Jung ◽  
Markus Gallei
Keyword(s):  
Optical Properties ◽  
Optical Sensors ◽  
Synergistic Effects ◽  
Emission Spectra ◽  
Particle Dispersion ◽  
Opal Matrix ◽  
Stimuli Responsive ◽  
Experimental Conditions ◽  
3 Dimensional ◽  
Structural Colors

Opal films with their vivid structural colors represent a field of tremendous interest and obtained materials offer the possibility for many applications, such as optical sensors or anti-counterfeiting materials. A convenient method for the generation of opal structures relies on the tailored design of core-interlayer-shell (CIS) particles. Within the present study, elastomeric opal films were combined with stimuli-responsive photoacids to further influence the optical properties of structurally colored materials. Starting from cross-linked polystyrene (PS) core particles featuring a hydroxy-rich and polar soft shell, opal films were prepared by application of the melt-shear organization technique. The photoacid tris(2,2,2-trifluoroethyl) 8-hydroxypyrene-1,3,6-trisulfonate (TFEHTS) could be conveniently incorporated during freeze-drying the particle dispersion and prior to the melt-shear organization. Furthermore, the polar opal matrix featuring hydroxylic moieties enabled excited-state proton transfer (ESPT), which is proved by spectroscopic evaluation. Finally, the influence of the photoacid on the optical properties of the 3-dimensional colloidal crystals were investigated within different experimental conditions. The angle dependence of the emission spectra unambiguously shows the selective suppression of the photoacid’s fluorescence in its deprotonated state.

Fluorescent Nanotechnology: An Evolution in Optical Sensors

2020 ◽  
Vol 17 ◽  
Author(s):  
Dilawar Hassan ◽  
Hadi Bakhsh ◽  
Asif M. Khurram ◽  
Shakeel A. Bhutto ◽  
Nida S. Jalbani ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Sensors ◽  
Light Emission ◽  
Environmental Contaminants ◽  
Fluorescent Nanoparticles ◽  
Sensing Applications ◽  
Properties Of Materials ◽  
Optical Properties Of Materials ◽  
Fluorescent Nanomaterials

Background: The optical properties of nanomaterials have evolved enormously with the introduction of nanotechnology. The property of materials to absorb and/or emit specific wavelength has turned them into one of the most favourite candidates to be effectively utilized in different sensing applications e.g organic light emission diodes (OLEDs) sensors, gas sensors, biosensors and fluorescent sensors. These materials have been reported as a sensor in the field of tissue and cell imaging, cancer detection and detection of environmental contaminants etc. Fluorescent nanomaterials are heling in rapid and timely detection of various contaminants that greatly impact the quality of life and food, that is exposed to these contaminants. Later, all the contaminants have been investigated to be most perilous entities that momentously affect the life span of the animals and humans who use those foods which have been contaminated. Objective: In this review, we will discuss about various methods and approaches to synthesize the fluorescent nanoparticles and quantum dots (QDs) and their applications in various fields. The application will include the detection of various environmental contaminants and bio-medical applications. We will discuss the possible mode of action of the nanoparticles when used as sensor for the environmental contaminants as well as the surface modification of some fluorescent nanomaterials with anti-body and enzyme for specific detection in animal kingdom. We will also describe some RAMAN based sensors as well as some optical sensing-based nanosensors. Conclusion: Nanotechnology has enabled to play with the size, shape and morphology of materials in the nanoscale. The physical, chemical and optical properties of materials change dramatically when they are reduced to nanoscale. The optical properties can become choosy in terms of emission or absorption of wavelength in the size range and can result in production of very sensitive optical sensor. The results show that the use of fluorescent nanomaterials for the sensing purposes are helping a great deal in the sensing field.

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