Band Gap and Absorption Profile Change by Changing Molecular Weight and Conformation of Water-soluble Narrow-band-gap Polymers

2010 ◽  
Vol 39 (12) ◽  
pp. 1288-1290 ◽  
Author(s):  
Hiroyuki Aota ◽  
Takeshi Ishikawa ◽  
Yuta Amiuchi ◽  
Hirofumi Yano ◽  
Tatsuya Kunimoto ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Band Gap ◽  
Narrow Band ◽  
Water Soluble ◽  
Absorption Profile ◽  
Profile Change

Electrical properties of doped conjugated polyelectrolytes with modulated density of the ionic functionalities

2015 ◽  
Vol 51 (99) ◽  
pp. 17607-17610 ◽  
Author(s):  
Cheng-Kang Mai ◽  
Tomoya Arai ◽  
Xiaofeng Liu ◽  
Stephanie L. Fronk ◽  
Gregory M. Su ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Band Gap ◽  
Functional Groups ◽  
Narrow Band ◽  
Water Soluble ◽  
Conjugated Polyelectrolytes

We report the synthesis of a series of water soluble anionic narrow band-gap conjugated polyelectrolytes with a varied density of the ionic functional groups.

scholarly journals Synthesis of Reactive Water-Soluble Narrow-Band-Gap Polymers for Post-Crosslinking

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 313
Author(s):  
Hao-xuan Guo ◽  
Takehiro Ohashi ◽  
Yusuke Imai ◽  
Hiroyuki Aota
Keyword(s):  
Band Gap ◽  
Narrow Band ◽  
Water Soluble ◽  
Polymer Chains ◽  
Crosslinking Reaction ◽  
Gravimetric Analysis ◽  
Crosslinked Polymer ◽  
Acid Sodium Salt ◽  
Reactive Groups ◽  
Sulfonic Acid Sodium Salt

In this study, water-soluble, narrow-band-gap polymers containing reactive groups were prepared by the addition-condensation of pyrrole (Pyr), benzaldehyde-2-sulfonic acid sodium salt (BS), and terephthalaldehydic acid (TPA) or p-hydroxybenzaldehyde (p-HB). TPA and p-HB were used for the post-crosslinking reaction between polymers. The polymers were characterized by employing various analyses such as 1H-NMR, thermal gravimetric analysis (TGA), and UV-Vis-NIR. The Eg values of polymers estimated from the absorption edges were 0.55 and 0.62 eV. The post-crosslinking reaction is important for preventing resolubilization and for developing an electron conducting route between the polymer chains. Herein, the post-crosslinked polymer was observed to maintain its narrow-band-gap and conductivity was increased 46 times compared to that observed before crosslinking.

ANALISA KANDUNGAN BETA-GLUKAN LARUT AIR DAN LARUT ALKALI DARI TUBUH BUAH JAMUR TIRAM (Pleurotus ostreatus) DAN SHIITAKE (Lentinus edodes)

2013 ◽  
Vol 13 (3) ◽  
Author(s):  
Netty Widyastuti ◽  
Teguh Baruji ◽  
Henky Isnawan ◽  
Priyo Wahyudi ◽  
Donowati Donowati
Keyword(s):  
Molecular Structure ◽  
Molecular Weight ◽  
Immune System ◽  
Pleurotus Ostreatus ◽  
Water Soluble ◽  
Low Molecular Weight ◽  
Lentinus Edodes ◽  
Beta Glucan ◽  
Oyster Mushrooms ◽  
The Difference

Beta glucan is a polysaccharide compound, generally not soluble inwater and resistant to acid. Beta glucan is used as an immunomodulator (enhancing the immune system) in mammals is usually a beta-glucan soluble in water, easily absorbed and has a low molecular weight. Several example of beta-glucan such as cellulose (β-1 ,4-glucan), lentinan (β-1 0.6-glucan) and (β-1 ,3-glucan), pleuran (β-1, 6 and β-1 ,3-glucan) are isolated from species of fungi Basidiomycota include mushrooms (Pleurotus ostreatus) and shiitake (Lentinus edodes).The purpose of thisresearch activity is to obtain beta-glucan compound that can be dissolved in water and in alkali derived from fungi Basidiomycota, i.e, Oyster mushrooms (Pleurotus ostreatus) and shiitake (Lentinus edodes). The result of beta-glucan compared to characterize the resulting beta glucan that is molecular structure . The difference of beta glucan extraction is based on the differences in solubility of beta-glucan. Beta glucan could be water soluble and insoluble water.

scholarly journals Wound Healing Promotion by Hyaluronic Acid: Effect of Molecular Weight on Gene Expression and In Vivo Wound Closure

2021 ◽  
Vol 14 (4) ◽  
pp. 301
Author(s):  
Yayoi Kawano ◽  
Viorica Patrulea ◽  
Emmanuelle Sublet ◽  
Gerrit Borchard ◽  
Takuya Iyoda ◽  
...  
Keyword(s):  
Gene Expression ◽  
Molecular Weight ◽  
Wound Healing ◽  
Hyaluronic Acid ◽  
Healing Process ◽  
Dermal Fibroblasts ◽  
Water Soluble ◽  
Wound Healing Process ◽  
And Migration ◽  
Proliferation And Migration

Hyaluronic acid (HA) has been known to play an important role in wound healing process. However, the effect of molecular weight (MW) of exogenously administered HA on the wound healing process has not been fully understood. In this study, we investigated HA with different MWs on wound healing process using human epidermal keratinocytes and dermal fibroblasts. Cell proliferation and migration ability were assessed by water soluble tetrazolium (WST) assay and wound scratch assay. We examined the effect of HA addition in a full-thickness wound model in mice and the gene expression related to wound healing. Proliferation and migration of HaCaT cells increased with the increase of MW and concentration of HA. Interleukin (IL-1β), IL-8 and vascular endothelial growth factor (VEGF) as well as matrix metalloproteinase (MMP)-9 and MMP-13 were significantly upregulated by high molecular weight (HMW) HA in keratinocytes. Together with VEGF upregulation and the observed promotion of HaCaT migration, HA with the MW of 2290 kDa may hold potential to improve re-epithelialization, a critical obstacle to heal chronic wounds.

scholarly journals Influence of surface band bending on a narrow band gap semiconductor: Tunneling atomic force studies of graphite with Bernal and rhombohedral stacking orders

2021 ◽  
Vol 5 (4) ◽  
Author(s):  
Regina Ariskina ◽  
Michael Schnedler ◽  
Pablo D. Esquinazi ◽  
Ana Champi ◽  
Markus Stiller ◽  
...  
Keyword(s):  
Band Gap ◽  
Narrow Band ◽  
Surface Band ◽  
Band Bending ◽  
Atomic Force
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