Optically active amino acid-based polyacetylenes: Effect of tunable helical conformation on infrared emissivity property

2014 ◽  
Vol 82 ◽  
pp. 17-24 ◽  
Author(s):  
Xiaohai Bu ◽  
Yuming Zhou ◽  
Zhenjie Chen ◽  
Man He ◽  
Tao Zhang
Keyword(s):  
Amino Acid ◽  
Optically Active ◽  
Helical Conformation ◽  
Infrared Emissivity ◽  
Active Amino Acid

Optically Active Amino Acid Synthesis by Artificial Transaminase Enzymes

Tetrahedron ◽  
1988 ◽  
Vol 44 (17) ◽  
pp. 5515-5524 ◽  
Author(s):  
Ronald Breslow ◽  
Jean Chmielewski ◽  
Diane Foley ◽  
Bruce Johnson ◽  
Naofumi Kumabe ◽  
...  
Keyword(s):  
Amino Acid ◽  
Acid Synthesis ◽  
Optically Active ◽  
Amino Acid Synthesis ◽  
Active Amino Acid

Preparation of Helical Monosubstituted Polyacetylene@CdSe Quantum Dots Composite and its Application for Low Infrared Emissivity

2014 ◽  
Vol 1044-1045 ◽  
pp. 88-91
Author(s):  
Xiao Hai Bu ◽  
Yu Ming Zhou ◽  
Man He ◽  
Tao Zhang ◽  
Hu Chuan Wang
Keyword(s):  
Quantum Dots ◽  
Optically Active ◽  
Helical Conformation ◽  
Cdse Quantum Dots ◽  
Infrared Emissivity ◽  
X Ray Diffraction ◽  
Cdse Qds ◽  
Transmission Electron ◽  
Ft Ir ◽  
Ester Linkage

Helical monosubstituted polyacetylene@CdSe quantum dots (HPA@CdSe QDs) nanocomposites were fabricated by grafting helical HPA polymers onto the surface of semiconductor QDs through ester linkage. Optically active HPA derived from chiral serine was polymerized by a rhodium zwitterion catalyst, and evidently proved to adopt a predominately single-handed helical conformation. The HPA@QDs nanocomposites were characterized by Fourier-transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and thermogravimetric analysis (TGA). The results indicate that the HPA matrix exhibits an enhancement in thermal stability after hybridization with CdSe QDs, while the QDs can maintain their original crystalline structure during the grafting process. The infrared emissivity property of the HPA@QDs nanocomposites at 8-14 μm was further investigated. These data demonstrated that the HPA@QDs composite film with doped CdSe QDs possesses an infrared emissivity value of 0.393, which was much lower than pristine HPA and QDs. This might be attributed to the incorporation of optically active helical HPA and semiconductor QDs in a hybrid phase and their strengthened interfacial interaction.

Sign in / Sign up

Export Citation Format

Share Document