scholarly journals A rapid microwave synthesis of green-emissive carbon dots with solid-state fluorescence and pH-sensitive properties

2018 ◽  
Vol 5 (7) ◽  
pp. 180245 ◽  
Author(s):  
Tingting Yu ◽  
Haijiao Wang ◽  
Chongzheng Guo ◽  
Yanli Zhai ◽  
Jianzhou Yang ◽  
...  
Keyword(s):  
Solid State ◽  
Photoelectron Spectroscopy ◽  
Phthalic Acid ◽  
Chemical Properties ◽  
Carbon Quantum Dots ◽  
Feed Ratio ◽  
Quantum Yields ◽  
Ph Sensing ◽  
Wavelength Emission ◽  
Physical And Chemical

The emerging carbon quantum dots (CQDs) have been attracting significant attention for their prominent fluorescence, excellent stability and outstanding biocompatibility. Here, we report a facile one-step synthesis of highly fluorescent CQDs by using phthalic acid and triethylenediamine hexahydrate as precursors through a simple microwave-assisted method. The reaction time needed is only 60 s, which is less time-consuming than most previous reports. The phthalic acid with a benzene ring can improve the photoluminescence properties of CQDs as it can provide foreign sp 2 conjugating units, and then finally result in long-wavelength emission. The synthesized CQDs were fully characterized by transmission electron microscopy, X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy. Besides, the impacts of different freed ratio on physical and chemical properties of CQDs were investigated in detail. The prepared CQDs exhibited strong green fluorescence with a broad maximum emission wavelength. The quantum yields of the CQDs can reach 16.1% in aqueous solution and they were successfully used in cell imaging with good biocompatibility. Moreover, in solid state, the CQDs with the feed ratio of 1 : 0.5 showed a strong green–yellow fluorescence which may have great potential to fabricate optoelectronic devices. Furthermore, the prepared CQDs also showed high pH sensitivity and can act as a fluorescence nanosensor for pH sensing.

scholarly journals Effect of lubricant ageing on lubricants’ physical and chemical properties and tribological performance; Part I: effect of lubricant chemistry

2018 ◽  
Vol 70 (2) ◽  
pp. 385-392 ◽  
Author(s):  
Hui Cen ◽  
Ardian Morina ◽  
Anne Neville
Keyword(s):  
Photoelectron Spectroscopy ◽  
Chemical Properties ◽  
Tribological Performance ◽  
Acid Number ◽  
Physical And Chemical Properties ◽  
Total Acid ◽  
Content Type ◽  
Post Test ◽  
Physical And Chemical ◽  
And Chemical Properties

Purpose Ageing has been known to affect the performance of lubricants. However, there is a lot of debate as to whether ageing is beneficial or detrimental to the wear performance of lubricants. Design/methodology/approach The purpose of this research is to evaluate the effect of ageing on the viscosity, total acid number and Fourier-transform infrared spectroscopy information of a series of lubricants. The tribological performance (friction and wear) of the aged lubricants is also studied, followed by X-ray photoelectron spectroscopy analysis on the selected post-test samples to study the tribochemical features of the tribofilm. Findings The results show that ageing has a different impact on lubricants and tribological performances based on the physical and chemical properties. Originality/value These findings will be compared with the research on the role of water in lubricant ageing (Part II of this study).

Impact of solid-state photochemical [2+2] cycloaddition on coordination polymers for diverse applications

2020 ◽  
Vol 49 (28) ◽  
pp. 9556-9563 ◽  
Author(s):  
Samim Khan ◽  
Basudeb Dutta ◽  
Mohammad Hedayetullah Mir
Keyword(s):  
Solid State ◽  
Coordination Polymers ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Physical And Chemical ◽  
Fine Tune ◽  
And Chemical Properties

This Frontier article highlights the advancement of [2+2] photocycloaddition reactions within coordination polymers to fine tune their diverse physical and chemical properties.

scholarly journals Inter-molecular physiochemical characterization for etodolac-hydroxypropyl-β-cyclodextrin polymeric systems in solid and liquid state

2010 ◽  
Vol 8 (4) ◽  
pp. 953-962 ◽  
Author(s):  
Vivek Sinha ◽  
Renu Chadha ◽  
Honey Goel ◽  
Keyword(s):  
Solid State ◽  
Inclusion Complexes ◽  
Liquid State ◽  
Chemical Properties ◽  
Aqueous Solubility ◽  
Phase Solubility ◽  
Scanning Calorimetry ◽  
Polymeric Systems ◽  
Hydrophobic Molecule ◽  
Physical And Chemical

AbstractThe purpose of this study was to explore the utility of hydroxypropyl-β-cyclodextrin (HP-β-CD) systems in forming inclusion complexes with the anti-rheumatic or anti-arthritic drug, etodolac (EDC), in order to overcome the limitation of its poor aqueous solubility. This inclusion system achieved high solubility for the hydrophobic molecule. The physical and chemical properties of each inclusion compound were investigated. Complexes of EDC with HP-β-CD were obtained using the kneading and co-evaporation techniques. Solid state characterization of the products was carried out using Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), powder X-ray diffraction (XRD) and Scanning electron microscopy (SEM). Studies in the solution state were performed using UV-Vis spectrophotometry and 1H-NMR spectroscopy. Phase solubility profiles with HP-β-CD employed was found to be AL type. Stability constants (Kc) from the phase solubility diagrams were calculated indicating the formation of 1:1 inclusion complex. Stability studies in the solid state and in liquid state were performed; the possible degradation by RP-HPLC was monitored. The dissolution studies revealed that EDC dissolution rate was improved by the formation of inclusion complexes.

Sila-Pharmaka, 31. Mitt. [1] Synthese, Struktur und pharmakologische Eigenschaften von Diphenyl(2-piperidinoethoxymethyl)silanol und seinem Kohlenstoff-Analogon / Sila-Pharmaca, 31 th Communication [1] Synthesis, Structure, and Pharmacological Properties of Diphenyl(2-piperidinoethoxymethyl)silanol and its Carbon Analogue

1983 ◽  
Vol 38 (6) ◽  
pp. 738-746 ◽  
Author(s):  
Reinhold Tacke ◽  
Hartwig Lange ◽  
William S. Sheldrick ◽  
Günter Lambrecht ◽  
Ulrich Moser ◽  
...  
Keyword(s):  
Solid State ◽  
Hydrogen Bonds ◽  
Chemical Properties ◽  
Pharmacological Properties ◽  
Physical And Chemical Properties ◽  
Antimuscarinic Agents ◽  
Physical And Chemical ◽  
And Chemical Properties

Abstract In the course of systematic investigations on sila-substituted parasympatholytics the diphenyl(2-aminoethoxymethyl)silanols 3b and 4b (and its carbon analogue 4a) were synthesized and characterized by their physical and chemical properties. In the solid state 4a and 4b form strong O-H---N hydrogen bonds, which are intramolecular (4a) and intermolecular (4b), respectively. 4a and 4b were found to be weak antimuscarinic agents (4b >4a) and strong papaverine-like spasmolytics (4a ≈4b).

scholarly journals Compounds of Complex Halo and Pseudohalo Acids of the Group II B Metals, Part I Etherate, Pyridine and Aniline Compounds of Zn(II)

1979 ◽  
Vol 34 (8) ◽  
pp. 1101-1106 ◽  
Author(s):  
A. G. Galinos ◽  
J. K . Kouinis ◽  
P. V. Ioannou ◽  
Th. F . Zafiropoulos ◽  
S. P. Perlepes
Keyword(s):  
Solid State ◽  
Ir Spectra ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Uv And Ir Spectra ◽  
Group Ii ◽  
Physical And Chemical ◽  
And Chemical Properties

The preparation of sixteen new etherate, pyridine and aniline compounds of complex halo and pseudohalo acids of Zn(II) is reported.The study of some physical and chemical properties as well as the UV and IR spectra of these compounds are discussed. Tetrahedral structures are proposed for all compounds in the solid state

Highly fluorescent triazolopyridine–thiophene D–A–D oligomers for efficient pH sensing both in solution and in the solid state

2019 ◽  
Vol 21 (13) ◽  
pp. 7174-7182 ◽  
Author(s):  
Nannan Jian ◽  
Kai Qu ◽  
Hua Gu ◽  
Lie Zou ◽  
Ximei Liu ◽  
...  
Keyword(s):  
Solid State ◽  
Fluorescence Quenching ◽  
Quantum Yields ◽  
Ph Sensing ◽  
Fluorescence Quantum Yields ◽  
High Fluorescence ◽  
Printed Patterns

Triazolopyridine–thiophene fluorophores exhibit high fluorescence quantum yields both in solution (80–89%) and in the solid state (13–26%). Because of an excellent and reversible pH induced fluorescence quenching/recovery, sensing devices such as fluorescent papers and complex inkjet-printed patterns are successfully fabricated for the detection of volatile acids both in solution and in a vapor atmosphere.

Sustainable Pharmaceutical Preparation Methods and Solid-state analysis Supporting Green Pharmacy

2020 ◽  
Vol 16 ◽  
Author(s):  
Ilma Nugrahani
Keyword(s):  
Solid State ◽  
Pharmaceutical Preparation ◽  
Three Dimensional ◽  
Chemical Properties ◽  
Environmental Damage ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Preparation Methods ◽  
Physical And Chemical ◽  
State Analysis

: Every "entity" or compound has physical and chemical properties as references for the synthesis and determination of the entity's structure. Thermodynamically, solid-state is the most stable matter in the universe and to be the ideal form in structure elucidation of pharmaceutical. The dry treatments become popular, such as mechanochemistry, microwave heating, and the using of deep eutectic agent. These techniques are viewed as the futuristic methods for reducing environmental damage, in line with "green pharmacy" concept. On the other hand, solid-state analysis methods from the simplest to the most sophisticated one have been used in the long decades, but most are for qualitative purposes. Recently many reports have proven that solid-state analysis instruments are reliable and prospective for implementing in the quantitative measurement. Infrared spectroscopy, powder x-ray diffraction, and differential scanning calorimetry have been employed in various kinetics and content determination studies. A revolutionary method developed for structural elucidation is single-crystal diffraction, which is capable of rapidly and accurately determining a three-dimensional chemical structure. Hereby it shown that the accurate, precise, economical, ease, rapid-speed, and reliability of solid-state analysis method are eco-benefits by reducing the reagent, catalyst, and organic solvent.

Evaluation of Sputtering Deposited 2-Dimensional MoS2 Film by Raman Spectroscopy

2015 ◽  
Vol 1781 ◽  
pp. 11-16 ◽  
Author(s):  
S. Ishihara ◽  
K. Suda ◽  
Y. Hibino ◽  
N. Sawamoto ◽  
T. Ohashi ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Photoelectron Spectroscopy ◽  
Transition Metal Dichalcogenides ◽  
Chemical Properties ◽  
Peak Frequency ◽  
Flexible Displays ◽  
Optical And Electronic Properties ◽  
Raman Modes ◽  
Metal Dichalcogenides ◽  
Physical And Chemical

ABSTRACTMolybdenum disulfide (MoS2), one of the transition-metal dichalcogenides, is a 2-dimensional semiconducting material that has a layered structure. Owing to excellent optical and electronic properties, the ultra-thin MoS2 film is expected to be used for various devices, such as transistors and flexible displays. In this study, we investigated the physical and chemical properties of sputtered-MoS2 film in the sub-10-nm region by Raman spectroscopy and X-ray photoelectron spectroscopy (XPS). As the results of Raman spectroscopy investigations, we observed two Raman modes, E12g and A1g, in the 2-dimensional MoS2 films. As the thickness of the MoS2 film decreased, the peak frequency difference between E12g and A1g modes increased. From the XPS investigations, we confirmed sulfur reductions from the 2-dimensional MoS2 films. Therefore, we considered that the sulfur vacancies in the MoS2 film affected the Raman peak positions. Moreover, we performed the additional sulfurization of sputtered-MoS2 films. From the XPS and Raman investigations, the quality of the sputtered-MoS2 films was improved by the additional sulfurization.

Sign in / Sign up

Export Citation Format

Share Document