Evoking Photothermy by Capturing Intramolecular Bond Stretching Vibration-Induced Dark-State Energy

ACS Nano ◽  
2020 ◽  
Vol 14 (4) ◽  
pp. 4265-4275 ◽  
Author(s):  
Ming Chen ◽  
Xiaoyan Zhang ◽  
Junkai Liu ◽  
Feng Liu ◽  
Ruoyao Zhang ◽  
...  
Keyword(s):  
State Energy ◽  
Dark State ◽  
Bond Stretching ◽  
Stretching Vibration

Coupling of the Double Bond Stretching Vibration in Divinyl Ethers

1971 ◽  
Vol 4 (1-2) ◽  
pp. 15-17 ◽  
Author(s):  
Howard Kimmel ◽  
William H. Snyder
Keyword(s):  
Double Bond ◽  
Bond Stretching ◽  
Stretching Vibration

Vibrational band intensities in substituted anilines

1957 ◽  
Vol 243 (1233) ◽  
pp. 143-153 ◽  
Keyword(s):  
Linear Relation ◽  
Vibrational Band ◽  
Vibration Band ◽  
Substituted Anilines ◽  
Absorption Bands ◽  
Bond Stretching ◽  
Infra Red ◽  
Analogous Data ◽  
Stretching Vibration ◽  
Stretching Vibrations

The infra-red absorption bands associated with the stretching vibrations of the NH 2 group in a series of meta - and para -substituted anilines have been examined. The effect of the sub­stituet groups upon the frequencies and intensities of the bands has been correlated with their Hammett σ factors. The widths of the bands have also been found to depend upon the position and nature of substituent. The linear relation between log (intensity) and σ suggested previously on the basis of other data has been found to hold in this case too. Measurements in several solvents have been compared, and surprising variations of band intensity have been found. Analogous data have been obtained for the N—H bond stretching vibration band in substituted N -methyl anilines. The effect of ortho substituents has also been examined in a few cases.

Spectroscopic Evidence for Near-Neighbor Bonded H(D) in A-Si:N:H(D) Thin Films

1996 ◽  
Vol 420 ◽  
Author(s):  
G. Lucovsky ◽  
P. Santos-Filho ◽  
A. Banerjee ◽  
Z. Jing
Keyword(s):  
Thin Films ◽  
Near Neighbor ◽  
Repulsive Interaction ◽  
Chemical Induction ◽  
Silicon Nitrides ◽  
Hydrogenated Silicon ◽  
Quantum Chemistry Calculations ◽  
Bond Stretching ◽  
Relative Separation ◽  
Stretching Vibration

AbstractIncreases in the frequency of the silicon monohydride (Si-H) bond-stretching vibration in hydrogenated silicon nitrides, over and above what can be attributed to chemical induction effects, are shown to be generated by a repulsive interaction between the H-atom of the Si-H group, and a near-neighbor SiN-H group. This interaction increases the effective bond-stretching force constant of the H-atom of the Si-H group. This effect has been verified by ab-initio quantum chemistry calculations that have been used to calculate the energy of the H-atom of the Si-H group as a function of the relative separation between near-neighbor Si-H and SiN-H groups. Decreases in the bond-stretching frequencies of SiN-H groups in heavily hydrogenated nitrides are attributed to H-bonding effects associated with near-neighbor pairs of SiN-H groups.

scholarly journals Synthetic Characterization of Cellulose from Moringa oleifera seeds and Potential Application in Water Purification

2021 ◽  
Author(s):  
A. F. Afolabi ◽  
S. S. Oluyamo ◽  
I. A. Fuwape
Keyword(s):  
Water Purification ◽  
Moringa Oleifera ◽  
Crystallinity Index ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
Bond Stretching ◽  
Stretching Vibration ◽  
High Degree

The use of Moringa oleifera seeds for purifying water has been attempted locally in various forms without putting scientific potency of the material into consideration. The cellulose sample isolated from Moringa {oleifera} seed was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR). The value of the crystallinity index (CIr ) from the XRD pattern is 63.1%. The high degree of crystallinity obtained is attributed to the high percentage of crystallinity index, CIr (i.e. 63.1%). The morphology revealed aggregates of conical and needle-like structure. The FTIR revealed O-H stretching, C-H stretching vibration, and C=O bond stretching functional groups. These characteristics are indicative of the potential of the material in water purification.

Synthesis and Thermal Property of Linear Chloromethylated Polystyrene

2010 ◽  
Vol 150-151 ◽  
pp. 1504-1507 ◽  
Author(s):  
Hong Chi Zhao ◽  
Juan Li Guo ◽  
Jiang Tao Li ◽  
Ling Ling Gao ◽  
Cong Cong Bian
Keyword(s):  
Gel Permeation Chromatography ◽  
Raw Material ◽  
Bending Vibration ◽  
Strong Absorption Band ◽  
Thermogravimetric Analyzer ◽  
Bond Stretching ◽  
Stretching Vibration ◽  
Infrared Spectrometer ◽  
Linear Poly ◽  
Aluminium Trichloride

Polystyrene (PS) was synthesized by emulsion polymerization. 1,4-bis(chloromethoxy)butane (BCMB) was synthesized using 1,4-butanediol, formaldehyde and phosphorus trichloride as raw material. The linear poly(p-chloromethyl styrene) (PS-Meyl-Cl) was prepared high effectively using BCMB and anhydrous aluminium trichloride as the chloromethylation reagent and catalyst, respectively. In this method, carcinogenic compound (chloromethyl ether etc.) was avoided. The resultant polymers were characterized by gel permeation chromatography (GPC), Fourier transform infrared spectrometer (FTIR) and thermogravimetric analyzer. The results show that the molecular weight (Mw) of PS is big. BCMB has been prepared because of the strong absorption band observed at 1130cm-1 (due to C-O-C bond stretching vibration) and two new bands at 640 and 1315cm-1 (due to the bending vibration of C-Cl bond and stretching vibration of C-H bond in -CH2Cl, respectively). Chloromethyl groups were introduced into benzene ring of PS because of the appearance of the absorption peaks at 676 and 1419cm-1 (due to the bending vibration of C-Cl bond and stretching vibration of C-H bond in -CH2Cl, respectively) in the FTIR spectra. The thermal stability of PS-Meyl-Cl was decreased with increasing chloromethyl group. Moreover, there are two decomposing stages. The reaction condition is gentle and the operation is safe, simple and economical.

scholarly journals High Efficiency Gas Permeability Membranes from Ethyl Cellulose Grafted with Ionic Liquids

Polymers ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 1900 ◽  
Author(s):  
Jingyu Xu ◽  
Hongge Jia ◽  
Nan Yang ◽  
Qingji Wang ◽  
Guoxing Yang ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Ethyl Cellulose ◽  
High Efficiency ◽  
Gas Permeability ◽  
Hydroxyl Groups ◽  
Cellulose Derivatives ◽  
Bond Stretching ◽  
Separation Factors ◽  
Stretching Vibration ◽  
Separation Performances

Ethyl cellulose was grafted with ionic liquids in optimal yields (62.5–64.1%) and grafting degrees (5.93–7.90%) by the esterification of the hydroxyl groups in ethyl cellulose with the carboxyl groups in ionic liquids. In IR spectra of the ethyl cellulose derivatives exhibited C=O bond stretching vibration peaks at 1760 or 1740 cm−1, confirming the formation of the ester groups and furnishing the evidence of the successful grafting of ethyl cellulose with ionic liquids. The ethyl cellulose grafted with ionic liquids could be formed into membranes by using the casting solution method. The resulting membranes exhibited good membrane forming ability and mechanical properties. The EC grafted with ionic liquids-based membranes demonstrated PCO2/PCH4 separation factors of up to 18.8, whereas the PCO2/PCH4 separation factor of 9.0 was obtained for pure EC membrane (both for CO2/CH4 mixture gas). The membranes also demonstrated an excellent gas permeability coefficient PCO2, up to 199 Barrer, which was higher than pure EC (PCO2 = 46.8 Barrer). Therefore, it can be concluded that the ionic liquids with imidazole groups are immensely useful for improving the gas separation performances of EC membranes.

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