scholarly journals Switchable fluorescence by click reaction of a novel azidocarbazole dye

RSC Advances ◽  
2014 ◽  
Vol 4 (23) ◽  
pp. 11528-11534 ◽  
Author(s):  
Anna Hörner ◽  
Daniel Volz ◽  
Tobias Hagendorn ◽  
Daniel Fürniss ◽  
Lutz Greb ◽  
...  
Keyword(s):  
Smart Materials ◽  
Spectral Properties ◽  
Click Reaction ◽  
New Class

Smart materials: A demand for switchable tags led us to the design of a new class of pre-fluorophores. We achieved this by using a non-fluorescent N-(4-azidophenyl)-carbazole tag which turns fluorescent by click reaction with alkynes and cyclooctynes. Syntheses and spectral properties were investigated.

Syntheses and spectral properties of tropocoronands, a new class of versatile metal-complexing macrocycles derived from aminotropone imines

1986 ◽  
Vol 25 (19) ◽  
pp. 3400-3407 ◽  
Author(s):  
Arie Zask ◽  
Nina Gonnella ◽  
Koji Nakanishi ◽  
Christopher J. Turner ◽  
Seichi Imajo ◽  
...  
Keyword(s):  
Spectral Properties ◽  
New Class

Experiments of Negative-Index Refraction in Optical Frequency Region

2010 ◽  
Vol 437 ◽  
pp. 575-579
Author(s):  
Jia Bi Chen ◽  
Bin Ming Liang ◽  
Da Wei Zhang ◽  
Song Lin Zhuang
Keyword(s):  
Photonic Crystal ◽  
Smart Materials ◽  
Microwave Frequency ◽  
Frequency Region ◽  
Optical Frequency ◽  
Negative Index ◽  
Transmitted Beam ◽  
Negative Index Materials ◽  
New Class ◽  
Significant Attention

Recently, significant attention has been devoted to a new class of smart materials – so-called negative-index materials (NIM). There are some direct experimental demonstrations of NIM in the microwave frequency region, but not in optical frequency region. Here we report a kind of optical negative-index material which is 2D photonic crystal and, by measuring the refractive angle of the transmitted beam through a prism fabricated from this material, we determine the effective n. These experiments directly confirm this material is an optical negative-index one.

Introducing “Advanced” Tuned Vibration Absorbers in an Undergraduate Vibrations Course

2005 ◽  
Author(s):  
Jeong-Hoi Koo ◽  
Fernando Goncalves ◽  
Hong Zhang
Keyword(s):  
Undergraduate Students ◽  
Smart Materials ◽  
Engineering Students ◽  
Primary Objective ◽  
Vibration Absorbers ◽  
Active Materials ◽  
New Class ◽  
Undergraduate Engineering ◽  
Tuned Vibration Absorbers ◽  
Real World Problems

The primary objective of this paper is to bridge the theory of tuned vibration absorbers (TVA) with the practice of implementing TVAs in systems. Often, the practice of implementing TVAs in systems is a far departure from the theory expressed in many textbooks. These departures are often required in practice to account for the less than ideal conditions that the TVAs will be operating under. Many retrofitted TVAs use “smart” or active materials along with various control techniques to improve the performance of the traditional TVA proposed in textbooks. The intent of the current paper is to demonstrate several of these modern methods of implementing retrofitted TVAs to undergraduate students. The first author introduced the methods in a junior level vibrations course, and is developing a laboratory experiment. Teaching these advanced TVAs to undergraduate engineering students will help them understand how theories learned in class are used in real world problems, and motivate them to explore new fields of research. After introducing a “textbook” vibration absorber theory, this paper describes principles and operations of a new class of vibration absorbers. In reviewing conventional TVAs, students are introduced to many of the engineering challenges encountered in the implementation of TVAs. One such challenge is inevitable off-tuning caused by system parameter changes with time. After identifying many of the challenges associated with the implementation of TVAs, the students are introduced to many modern solutions to these problems. Many of these solutions involve the use of smart materials, such as piezoceramics, magnetorheological fluids, magnetorheological elastomers, shape memory alloys, etc. Through this experience, students are introduced to many smart materials and have the opportunity to see how these smart materials can provide solutions to many engineering challenges and improve existing technologies.

Synthesis, Spectral Properties, and Detection Limits of Reactive Squaraine Dyes, a New Class of Diode Laser Compatible Fluorescent Protein Labels

1999 ◽  
Vol 10 (6) ◽  
pp. 925-931 ◽  
Author(s):  
Bernhard Oswald ◽  
Leonid Patsenker ◽  
Josef Duschl ◽  
Henryk Szmacinski ◽  
Otto S. Wolfbeis ◽  
...  
Keyword(s):  
Diode Laser ◽  
Spectral Properties ◽  
Fluorescent Protein ◽  
Detection Limits ◽  
Squaraine Dyes ◽  
New Class

scholarly journals Synthesis and Spectral Properties of 6'-Triazolyl-Dihydroxanthene-Hemicyanine Fused Near-Infrared Dyes

2020 ◽  
Author(s):  
Gu Lingyue ◽  
Kévin RENAULT ◽  
Anthony ROMIEU ◽  
Jean-Alexandre RICHARD ◽  
Rajavel Srinivasan
Keyword(s):  
Optical Properties ◽  
Spectral Properties ◽  
Molecular Diversity ◽  
Near Infrared ◽  
Click Reaction ◽  
Fine Tuning ◽  
Active Materials ◽  
Hybrid Scaffold ◽  
Physiological Conditions ◽  
Phosphate Buffered Saline

We describe the synthesis of a range of 6’-triazolyl-dihydroxanthene-hemicyanine (DHX-hemicyanine) fused dyes through an effective copper-catalyzed azide-alkyne cycloaddition (CuAAC) "click" reaction, with the dual aim of providing molecular diversity and fine tuning spectral properties of these near-infrared (NIR)-active materials. This was implemented by reacting 16 different aliphatic and aromatic azides with a terminal alkynyl-based-DHX-hemicyanine hybrid scaffold prepared in four steps and 35% overall yield from 4-bromosalicylaldehyde. The resulting triazole derivatives have been fully characterized and their optical properties determined both in organic solvents and simulated physiological conditions (phosphate buffered saline containing 5% of bovine serum albumin protein). This systematic study is a first important step towards the development of NIR-I fluorogenic "click-on" dyes or related photoactive agents for light-based diagnostic and/or therapeutic applications.

scholarly journals Nano-3D-printed Photochromic Objects

2020 ◽  
Author(s):  
Sebastian Ulrich ◽  
Xiaopu Wang ◽  
Markus Rottmar ◽  
René M. Rossi ◽  
Bradley J. Nelson ◽  
...  
Keyword(s):  
Click Reaction ◽  
Thermal Recovery ◽  
Fine Tuning ◽  
Excitation Wavelength ◽  
Color Changes ◽  
New Class ◽  
Direct Laser ◽  
Donor Acceptor ◽  
3D Printed ◽  
Post Modification

A new class of photoresist is described for direct laser writing of photoswitchable 3D microstructures. The material comprising off-stoichiometric thiol-ene photo-clickable resins enables rapid two-photon laser processing of highly complex structures and facile post-modification with photoswitches. The microstructures were functionalized with a series of donor-acceptor Stenhouse adducts (DASAs) photoswitches with different excitation wavelength. The versatility of thiol–ene photo-click reaction enabled fine-tuning of the network structure and physical properties as well as the type and concentration of DASA photoswitches. When exposed to visible light, these microstructures exhibit excellent photo-responsiveness and undergo reversible color-changing via photoisomerization of DASA moieties. We describe that the weak fluorescence of DASAs can be used as a reporter of photoswitching, color changes, and thermal recovery, allowing the reading of DASA-containing sub-micrometric structures in 3D. This work delivers a new approach for custom microfabrication of 3D photochromic objects with molecularly engineered color and responsiveness.

scholarly journals Selenium-Epoxy ‘Click’ Reaction and Se-Alkylation—Efficient Access to Organo-Selenium and Selenonium Compounds

Chemistry ◽  
2020 ◽  
Vol 2 (4) ◽  
pp. 827-836
Author(s):  
Taejun Eom ◽  
Anzar Khan
Keyword(s):  
Red Blood Cells ◽  
Blood Cells ◽  
Ring Opening ◽  
Click Reaction ◽  
Oxirane Ring ◽  
New Class ◽  
Ring Opening Reaction ◽  
Efficient Access ◽  
High Concentrations ◽  
Cationic Materials

This work establishes the ‘click’ nature of the base-catalyzed oxirane ring opening reaction by the selenolate nucleophile. The ‘click’-generated ß-hydroxy selenide can be alkylated to afford cationic selenium species. Hemolytic studies suggest that selenonium cations do not lyse red blood cells even at high concentrations. Overall, these results indicate the future applicability of the developed organo-selenium chemistry in the preparation of a new class of cationic materials based on the seleno-ether motif.

Self-Healing Polymeric Materials

2017 ◽  
Vol 727 ◽  
pp. 482-489 ◽  
Author(s):  
Cui Cui Su ◽  
Jian Sheng Chen
Keyword(s):  
Future Development ◽  
Smart Materials ◽  
Polymeric Materials ◽  
Development Trend ◽  
Self Healing ◽  
New Class ◽  
Advantages And Disadvantages ◽  
System Success ◽  
And Performance ◽  
External Intervention

During the last few years, synthetic self-healing materials have become a new class of emerging smart materials with the ability to repair damage and restore lost or degraded properties or performance using resources inherently available to the system. Success in the design of self-healing materials is important to material safety, product reliability and prolonged lifetime. This article covers fundamental material-independent principles and different self-healing approaches for polymeric materials. Among these approaches, some depend on specific external stimulus to achieve their goal while others regain the physical properties of the pristine material without such external intervention. Both the mechanisms and performance of different methods are discussed and evaluated, along with their advantages and disadvantages. In the end, both the potential application areas and the main challenges are also discussed in this article for a better understanding of future development trend of self-healing polymeric materials.

Smart Material Composites for Discrete Stiffness Materials

2018 ◽  
Author(s):  
Emily A. Allen ◽  
Lee D. Taylor ◽  
John P. Swensen
Keyword(s):  
Melting Point ◽  
Smart Materials ◽  
Biological Systems ◽  
Initial Step ◽  
Robotic Systems ◽  
Beam Structure ◽  
New Class ◽  
Different Temperatures ◽  
Materials Used ◽  
Local Stiffness

This paper presents an initial step towards a new class of soft robotics materials, where localized, geometric patterning of smart materials can exhibit discrete levels of stiffness through the combinations of smart materials used. This work is inspired by a variety of biological systems where actuation is accomplished by modulating the local stiffness in conjunction with muscle contractions. Whereas most biological systems use hydrostatic mechanisms to achieve stiffness variability, and many robotic systems have mimicked this mechanism, this work aims to use smart materials to achieve this stiffness variability. Here we present the compositing of the low melting point Field’s metal, shape memory alloy Nitinol, and a low melting point thermoplastic Polycaprolactone (PCL), composited in simple beam structure within silicone rubber. The comparison in bending stiffnesses at different temperatures, which reside between the activation temperatures of the composited smart materials demonstrates the ability to achieve discrete levels of stiffnesses within the soft robotic tissue.

scholarly journals Novel 1,2,3-triazolium-functionalized inulin derivatives: synthesis, free radical-scavenging activity, and antifungal activity

RSC Advances ◽  
2017 ◽  
Vol 7 (67) ◽  
pp. 42225-42232 ◽  
Author(s):  
Qing Li ◽  
Lishushi Qiu ◽  
Wenqiang Tan ◽  
Guodong Gu ◽  
Zhanyong Guo
Keyword(s):  
Free Radical ◽  
Antifungal Activity ◽  
Click Reaction ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Free Radical Scavenging ◽  
Free Radical Scavenging Activity ◽  
Scavenging Activity ◽  
New Class ◽  
Radical Scavenging Ability

A new class of inulin derivatives possessing 1,2,3-triazolium charged units by associating “click reaction” with efficient 1,2,3-triazole quaternization were designed and synthesized. The synthesized inulin derivatives possess excellent free radical-scavenging ability.

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