Water in Ionic Liquids: Correlation between Anion Hydrophilicity and Near-Infrared Fingerprints

ChemPhysChem ◽  
2016 ◽  
Vol 17 (11) ◽  
pp. 1586-1590 ◽  
Author(s):  
Elena TomŠík ◽  
Natalia Gospodinova
Keyword(s):  
Ionic Liquids ◽  
Near Infrared

Synthesis, structure and near-infrared photoluminescence of hexanitratoneodymate ionic liquids

2015 ◽  
Vol 44 (5) ◽  
pp. 2325-2332 ◽  
Author(s):  
Ling He ◽  
Shun-Ping Ji ◽  
Ning Tang ◽  
Ying Zhao ◽  
Guo-Hong Tao
Keyword(s):  
Ionic Liquids ◽  
Near Infrared ◽  
Soft Materials ◽  
High Symmetry

Novel water-free lanthanide ionic liquids, with high-symmetry 12-coordinated hexanitratoneodymate, are of interest as potential near-infrared (NIR) luminescent soft materials.

scholarly journals Use of Buckwheat Straw to Produce Ethyl Alcohol Using Ionic Liquids

Energies ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 2014
Author(s):  
Małgorzata Smuga-Kogut ◽  
Leszek Bychto ◽  
Bartosz Walendzik ◽  
Judyta Cielecka-Piontek ◽  
Roman Marecik ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Enzymatic Hydrolysis ◽  
Alcoholic Fermentation ◽  
Near Infrared ◽  
Rapid Determination ◽  
Raw Material ◽  
Pls Regression ◽  
Enzymatic Preparation ◽  
Second Generation Bioethanol

Background: Common buckwheat (Fagopyrum esculentum Moench) is an annual spring-emerging crop that is classified among the dicotyledons, due to the manner of its cultivation, use, and chemical composition of seeds. The use of buckwheat straw for energy purposes—for example, for the production of second generation bioethanol—might enable its wider application and increase the cost-effectiveness of tillage. Methods: In this study, we examined the usability of buckwheat straw for the production of bioethanol. We pretreated the raw material with ionic liquids and subsequently performed enzymatic hydrolysis and alcoholic fermentation. The obtained chemometric data were analyzed using the Partial Least Squares (PLS) regression model. PLS regression in combination with spectral analysis within the near-infrared (NIR) spectrum allowed for the rapid determination of the amount of cellulose in the raw material and also provided information on the changes taking place in its structure. Results: We obtained good results for the combination of 1-ethyl-3-methylimidazolium acetate as the ionic liquid and Cellic CTec2 as the enzymatic preparation for the pretreatment of buckwheat straw. The highest concentration of glucose following 72 h of enzymatic hydrolysis was found to be around 5.5 g/dm3. The highest concentration of ethanol (3.31 g/dm3) was obtained with the combination of 1-butyl-3-methylimidazolium acetate for the pretreatment and cellulase from Trichoderma reesei for enzymatic hydrolysis. Conclusions: In summary, the efficiency of the fermentation process is strictly associated with the pool of available fermenting sugars, and it depends on the type of ionic liquid used during the pretreatment and on the enzymatic preparation. It is possible to obtain bioethanol from buckwheat straw using ionic liquid for pretreatment of the raw material prior to the enzymatic hydrolysis and alcoholic fermentation of the material.

scholarly journals Use of Buckwheat Straw to Produce Ethyl Alcohol Using Ionic Liquids

2019 ◽  
Author(s):  
Malgorzata Smuga-Kogut ◽  
Leszek Bychto ◽  
Bartosz Walendzik ◽  
Daria Szymanowska ◽  
Roman Marecik ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Enzymatic Hydrolysis ◽  
Alcoholic Fermentation ◽  
Near Infrared ◽  
Rapid Determination ◽  
Raw Material ◽  
Pls Regression ◽  
Enzymatic Preparation ◽  
Second Generation Bioethanol

Common buckwheat (Fagopyrum esculentum Moench) is an annual spring-emerging crop that is classified among dicotyledons, yet due to the manner of its cultivation, use, and chemical composition of seeds. The use of buckwheat straw for energy purposes, for example, for the production of second generation bioethanol might enable its wider application and increase the cost-effectiveness of tillage. In this study, we examined the usability of buckwheat straw for the production of bioethanol. We pretreated the raw material with using ionic liquids and subsequently performed enzymatic hydrolysis and alcoholic fermentation. The obtained chemometric data was analyzed using the Partial Least Squares (PLS) regression model. PLS regression in combination with the spectral analysis within near-infrared (NIR) spectrum allowed for the rapid determination of amount of cellulose in the raw material and also provided information on the changes taking place in its structure. According to our results, we obtained good results for the combination of 1-ethyl-3-methylimidazolium acetate as the ionic liquid and Cellic CTec2 and the enzymatic preparation for the pretreatment of buckwheat straw. The highest concentration of glucose following 72 hours of enzymatic hydrolysis was found to be around 5.5 g/dm3. The highest concentration of ethanol (3.31 g/dm3) was obtained with the combination of 1-butyl-3-methylimidazolium acetate for the pretreatment and the cellulase from Trichoderma reesei for enzymatic hydrolysis. In summary, the efficiency of the fermentation process is strictly associated with the pool of available fermenting sugars, and it depends on the type of ionic liquid used during the pretreatment and on the enzymatic preparation. It is possible to obtain bioethanol from buckwheat straw using ionic liquid for the pretreatment of the raw material prior to the enzymatic hydrolysis and alcoholic fermentation of the material.

Ultrabroad near-infrared photoluminescence from ionic liquids containing subvalent bismuth

2011 ◽  
Vol 36 (2) ◽  
pp. 100 ◽  
Author(s):  
Hong-Tao Sun ◽  
Yoshio Sakka ◽  
Minoru Fujii ◽  
Naoto Shirahata ◽  
Hong Gao
Keyword(s):  
Ionic Liquids ◽  
Near Infrared

scholarly journals Ionic liquids as solvents for near-infrared emitting lanthanide complexes

2004 ◽  
Vol 395 (4-6) ◽  
pp. 306-310 ◽  
Author(s):  
Kris Driesen ◽  
Peter Nockemann ◽  
Koen Binnemans
Keyword(s):  
Ionic Liquids ◽  
Lanthanide Complexes ◽  
Near Infrared

Absorption of Water by Room-Temperature Ionic Liquids: Effect of Anions on Concentration and State of Water

2003 ◽  
Vol 57 (2) ◽  
pp. 152-157 ◽  
Author(s):  
Chieu D. Tran ◽  
Silvia H. De Paoli Lacerda ◽  
Daniel Oliveira
Keyword(s):  
Ionic Liquids ◽  
Hydrogen Bonds ◽  
Room Temperature ◽  
Near Infrared ◽  
Room Temperature Ionic Liquids ◽  
Water Molecules ◽  
Structure Of Water ◽  
State Of Water

Near-infrared (NIR) spectrometry was successfully used for the noninvasive and in situ determination of concentrations and structure of water absorbed by room-temperature ionic liquids (RTILs). It was found that RTILs based on 1-butyl-3-methylimidazolium, namely, [BuMIm]+[BF4]−, [BuMIm]+[bis((trifluoromethyl)sulfonyl)amide, or Tf2N]− and [BuMIm]+[PF6]−, are hydroscopic and can quickly absorb water when they are exposed to air. Absorbed water interacts with the anions of the RTILs, and these interactions lead to changes in the structure of water. Among the RTILs studied, [BF4]− provides the strongest interactions and [PF6]− the weakest. In 24 hours, [BuMIm]+[BF4]− can absorb up to 0.320 M of water, whereas [BuMIm]+[PF6]− can only absorb 8.3 × 10−2 M of water. It seems that higher amounts of water can be absorbed when the anion of the RTIL can strongly interact and hence stabilize absorbed water molecules by forming hydrogen bonds with them or inducing hydrogen bonds among water molecules. More importantly, the NIR technique can be sensitively used for the noninvasive, in situ determination of absorbed water in RTILs, without any pretreatment, and at limits of detection as low as 3.20 × 10−3 M.

Construction of a near-infrared responsive upconversion nanoplatform against hypoxic tumors via NO-enhanced photodynamic therapy

Nanoscale ◽  
2020 ◽  
Vol 12 (14) ◽  
pp. 7875-7887 ◽  
Author(s):  
Ying Lan ◽  
Xiaohui Zhu ◽  
Ming Tang ◽  
Yihan Wu ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Near Infrared ◽  
Upconversion Nanoparticles

A near-infrared (NIR) activated theranostic nanoplatform based on upconversion nanoparticles (UCNPs) is developed in order to overcome the hypoxia-associated resistance in photodynamic therapy by photo-release of NO upon NIR illumination.

A nitroreductase-activatable near-infrared theranostic photosensitizer for photodynamic therapy under mild hypoxia

2020 ◽  
Vol 56 (43) ◽  
pp. 5819-5822
Author(s):  
Jing Zheng ◽  
Yongzhuo Liu ◽  
Fengling Song ◽  
Long Jiao ◽  
Yingnan Wu ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Triplet State ◽  
Near Infrared ◽  
Mild Hypoxia

In this study, a near-infrared (NIR) theranostic photosensitizer was developed based on a heptamethine aminocyanine dye with a long-lived triplet state.

Sign in / Sign up

Export Citation Format

Share Document