Peripheral versus axial substituted phthalocyanine-double-walled carbon nanotube hybrids as light harvesting systems

2015 ◽  
Vol 3 (39) ◽  
pp. 10215-10224 ◽  
Author(s):  
Luis M. Arellano ◽  
Luis Martín-Gomis ◽  
Habtom B. Gobeze ◽  
Myriam Barrejón ◽  
Desiré Molina ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Energy Harvesting ◽  
Light Harvesting ◽  
Photophysical Properties ◽  
Light Energy ◽  
Harvesting Systems ◽  
Covalently Linked

Syntheses, characterization and photophysical properties of two covalently linked double-walled carbon nanotube-phthalocyanine nanohybrids is reported, as new light energy harvesting materials.

Indoor-light-energy-harvesting dye-sensitized photo-rechargeable battery

2020 ◽  
Vol 13 (5) ◽  
pp. 1473-1480 ◽  
Author(s):  
Byung-Man Kim ◽  
Myeong-Hee Lee ◽  
Vijayan Sobhana Dilimon ◽  
Jeong Soo Kim ◽  
Jung Seung Nam ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Light Harvesting ◽  
Light Energy ◽  
Rechargeable Battery ◽  
Dye Sensitized ◽  
Dim Light ◽  
Iot Devices ◽  
Sun Light

Dye-sensitized photo-rechargeable battery (DSPB) harvests and stores dim light efficiently, realizing indoor-light-harvesting battery to operate IoT devices successfully without sun light.

Power Estimation for Indoor Light Energy Harvesting Systems

2020 ◽  
Vol 69 (10) ◽  
pp. 7513-7521 ◽  
Author(s):  
Xinyu Ma ◽  
Sebastian Bader ◽  
Bengt Oelmann
Keyword(s):  
Energy Harvesting ◽  
Power Estimation ◽  
Light Energy ◽  
Harvesting Systems

scholarly journals Dissecting pigment architecture of individual photosynthetic antenna complexes in solution

2015 ◽  
Vol 112 (45) ◽  
pp. 13880-13885 ◽  
Author(s):  
Quan Wang ◽  
W. E. Moerner
Keyword(s):  
Single Molecule ◽  
Light Harvesting ◽  
Fluorescent Proteins ◽  
Protein Complexes ◽  
Photophysical Properties ◽  
Critical Role ◽  
Photosynthetic Pigment ◽  
Emergent Properties ◽  
Aqueous Environment ◽  
Harvesting Systems

Oligomerization plays a critical role in shaping the light-harvesting properties of many photosynthetic pigment−protein complexes, but a detailed understanding of this process at the level of individual pigments is still lacking. To study the effects of oligomerization, we designed a single-molecule approach to probe the photophysical properties of individual pigment sites as a function of protein assembly state. Our method, based on the principles of anti-Brownian electrokinetic trapping of single fluorescent proteins, step-wise photobleaching, and multiparameter spectroscopy, allows pigment-specific spectroscopic information on single multipigment antennae to be recorded in a nonperturbative aqueous environment with unprecedented detail. We focus on the monomer-to-trimer transformation of allophycocyanin (APC), an important antenna protein in cyanobacteria. Our data reveal that the two chemically identical pigments in APC have different roles. One (α) is the functional pigment that red-shifts its spectral properties upon trimer formation, whereas the other (β) is a “protective” pigment that persistently quenches the excited state of α in the prefunctional, monomer state of the protein. These results show how subtleties in pigment organization give rise to functionally important aspects of energy transfer and photoprotection in antenna complexes. The method developed here should find immediate application in understanding the emergent properties of other natural and artificial light-harvesting systems.

scholarly journals Simultaneous Presence of Bacteriochlorophyll and Xanthorhodopsin Genes in a Freshwater Bacterium

mSystems ◽  
2020 ◽  
Vol 5 (6) ◽  
pp. e01044-20
Author(s):  
Karel Kopejtka ◽  
Jürgen Tomasch ◽  
Yonghui Zeng ◽  
Vadim Selyanin ◽  
Marko Dachev ◽  
...  
Keyword(s):  
Light Harvesting ◽  
Reaction Centers ◽  
Light Energy ◽  
Natural Environments ◽  
Experimental Conditions ◽  
Light Harvesting Complex ◽  
Rhodopsin Gene ◽  
Harvesting Systems ◽  
Photosynthesis Genes ◽  
High Concentrations

ABSTRACTPhotoheterotrophic bacteria represent an important part of aquatic microbial communities. There exist two fundamentally different light-harvesting systems: bacteriochlorophyll-containing reaction centers or rhodopsins. Here, we report a photoheterotrophic Sphingomonas strain isolated from an oligotrophic lake, which contains complete sets of genes for both rhodopsin-based and bacteriochlorophyll-based phototrophy. Interestingly, the identified genes were not expressed when cultured in liquid organic media. Using reverse transcription quantitative PCR (RT-qPCR), RNA sequencing, and bacteriochlorophyll a quantification, we document that bacteriochlorophyll synthesis was repressed by high concentrations of glucose or galactose in the medium. Coactivation of photosynthesis genes together with genes for TonB-dependent transporters suggests the utilization of light energy for nutrient import. The photosynthetic units were formed by ring-shaped light-harvesting complex 1 and reaction centers with bacteriochlorophyll a and spirilloxanthin as the main light-harvesting pigments. The identified rhodopsin gene belonged to the xanthorhodopsin family, but it lacks salinixanthin antenna. In contrast to bacteriochlorophyll, the expression of xanthorhodopsin remained minimal under all experimental conditions tested. Since the gene was found in the same operon as a histidine kinase, we propose that it might serve as a light sensor. Our results document that photoheterotrophic Sphingomonas bacteria use the energy of light under carbon-limited conditions, while under carbon-replete conditions, they cover all their metabolic needs through oxidative phosphorylation.IMPORTANCE Phototrophic organisms are key components of many natural environments. There exist two main phototrophic groups: species that collect light energy using various kinds of (bacterio)chlorophylls and species that utilize rhodopsins. Here, we present a freshwater bacterium Sphingomonas sp. strain AAP5 which contains genes for both light-harvesting systems. We show that bacteriochlorophyll-based reaction centers are repressed by light and/or glucose. On the other hand, the rhodopsin gene was not expressed significantly under any of the experimental conditions. This may indicate that rhodopsin in Sphingomonas may have other functions not linked to bioenergetics.

The influence of bridging ligand electronic structure on the photophysical properties of noble metal diimine and triimine light harvesting systems

2006 ◽  
Vol 87 (1) ◽  
pp. 83-103 ◽  
Author(s):  
Xian-yong Wang ◽  
Andre Del Guerzo ◽  
Sujoy Baitalik ◽  
Gerald Simon ◽  
George B. Shaw ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Noble Metal ◽  
Light Harvesting ◽  
Photophysical Properties ◽  
Bridging Ligand ◽  
Harvesting Systems

Implications of Relaxation Dynamics of Collapsed Conjugated Polymeric Nanoparticles for Light-Harvesting Applications

2021 ◽  
Author(s):  
Amitava Patra ◽  
Arnab Ghosh ◽  
Srijon Ghosh ◽  
Goutam Ghosh
Keyword(s):  
Energy Harvesting ◽  
Conjugated Polymer ◽  
Light Harvesting ◽  
Polymeric Nanoparticles ◽  
Photophysical Properties ◽  
Relaxation Dynamics ◽  
Healthcare Applications

The conjugated polymer-based nanostructures have been explored extensively from energy harvesting to healthcare applications due to their unique photophysical properties. This perspective includes the mechanism of the formation of polymer...

Self-assembling and light-harvesting properties of fluorescent linear condensed aromatic gelators

2006 ◽  
Vol 78 (12) ◽  
pp. 2333-2339 ◽  
Author(s):  
Jean-Pierre Desvergne ◽  
Alexandre G. L. Olive ◽  
Neralagatta M. Sangeetha ◽  
Jens Reichwagen ◽  
Henning Hopf ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Light Harvesting ◽  
Photophysical Properties ◽  
The Self ◽  
Supramolecular Network ◽  
3 Dimensional ◽  
Self Assembling ◽  
Harvesting Systems

The self-assembling and photophysical properties of soluble fluorescent linear condensed aromatic gelators are reported. The gels formed by 2,3-alkoxy derivatives are constituted of nanofibers weaving a 3-dimensional supramolecular network and imprisoning the solvent. These nanofibers are efficient light-harvesting systems in which complete energy transfer toward a fluorescent acceptor can be achieved at doping levels below 1 mol % of acceptor.

Analysis of magneto rheological elastomers for energy harvesting systems

2020 ◽  
Vol 64 (1-4) ◽  
pp. 439-446
Author(s):  
Gildas Diguet ◽  
Gael Sebald ◽  
Masami Nakano ◽  
Mickaël Lallart ◽  
Jean-Yves Cavaillé
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Shear Strain ◽  
Magnetic Induction ◽  
Magnetic Particles ◽  
Homogeneous Magnetic Field ◽  
Electrical Signal ◽  
Harvesting Systems ◽  
Dc Bias ◽  
Magneto Rheological

Magneto Rheological Elastomers (MREs) are composite materials based on an elastomer filled by magnetic particles. Anisotropic MRE can be easily manufactured by curing the material under homogeneous magnetic field which creates column of particles. The magnetic and elastic properties are actually coupled making these MREs suitable for energy conversion. From these remarkable properties, an energy harvesting device is considered through the application of a DC bias magnetic induction on two MREs as a metal piece is applying an AC shear strain on them. Such strain therefore changes the permeabilities of the elastomers, hence generating an AC magnetic induction which can be converted into AC electrical signal with the help of a coil. The device is simulated with a Finite Element Method software to examine the effect of the MRE parameters, the DC bias magnetic induction and applied shear strain (amplitude and frequency) on the resulting electrical signal.

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