Visualizing Chemical Compositions and Kinetics of Sol−Gel by Near-Infrared Multispectral Imaging Technique

2002 ◽  
Vol 74 (7) ◽  
pp. 1604-1610 ◽  
Author(s):  
Chieu D. Tran ◽  
Mario Politi
Keyword(s):  
Near Infrared ◽  
Multispectral Imaging ◽  
Imaging Technique ◽  
Sol Gel ◽  
Chemical Compositions ◽  
Kinetics Of

Non-destructively sensing pork quality using near infrared multispectral imaging technique

RSC Advances ◽  
2015 ◽  
Vol 5 (116) ◽  
pp. 95903-95910 ◽  
Author(s):  
Qiping Huang ◽  
Huanhuan Li ◽  
Jiewen Zhao ◽  
Gengping Huang ◽  
Quansheng Chen
Keyword(s):  
Near Infrared ◽  
Multispectral Imaging ◽  
Imaging System ◽  
Imaging Technique ◽  
Water Holding Capacity ◽  
Pork Quality ◽  
Water Holding ◽  
Non Destructive

Near infrared multispectral imaging system based on three wavebands—1280 nm, 1440 nm and 1660 nm—was developed for the non-destructive sensing of the tenderness and water holding capacity of pork.

scholarly journals ACTIVE SPECTRAL IMAGING NONDESTRUCTIVE EVALUATION (SINDE) CAMERA

2016 ◽  
Vol 5 (1) ◽  
pp. 121-125 ◽  
Author(s):  
Eli Simova ◽  
Paul A. Rochefort
Keyword(s):  
Nondestructive Evaluation ◽  
Near Infrared ◽  
Multispectral Imaging ◽  
Light Emitting Diodes ◽  
Imaging Technique ◽  
Spectral Imaging ◽  
Video Camera ◽  
Proof Of Concept ◽  
Light Emitting

A proof-of-concept video camera for active spectral imaging nondestructive evaluation has been demonstrated. An active multispectral imaging technique has been implemented in the visible and near infrared by using light emitting diodes with wavelengths spanning from 400 to 970 nm. This shows how the camera can be used in nondestructive evaluation to inspect surfaces and spectrally identify materials and corrosion.

Bioactivity of PLGA-gel-derived bioglass composites

2018 ◽  
Vol 3 (2) ◽  
pp. 27-34
Author(s):  
Maria Łączka ◽  
Ewelina Maślanka ◽  
Justyna Pawlik ◽  
Michał Dziadek ◽  
Barbara Zagrajczuk ◽  
...  
Keyword(s):  
Calcium Phosphates ◽  
Sol Gel ◽  
P Uptake ◽  
Physiological Solution ◽  
Chemical Compositions ◽  
Ion Release ◽  
Bioactive Properties ◽  
Sol Gel Process ◽  
Kinetics Of ◽  
Surface Changes

A series of PLGA (poly L-lactide-co-glycolide) based composites modified with gel-derived glasses in the form of foils were obtained by solvent casting procedure. As a modifier, glass particles with different chemical compositions from the CaO–SiO2, CaO–P2O5–SiO2, and Al2O3–SiO2 systems were used. All glasses were synthesized by the sol-gel process. Evaluation of bioactive properties of obtained composites was made on the basis of surface changes occurring during contact with simulated body fluid. The changes of Ca, P and Si ions concentration in SBF after incubation of composites were also measured. The result showed that all composites with bioglasses (CaO–SiO2, CaO–P2O5–SiO2) exhibit formation of calcium phosphates layer after SBF test, however, kinetics of Ca, Si ion release and P uptake from SBF was dependent on bioglass chemical composition. The higher solubility, as well as faster consumption of phosphorus from SBF, was observed for materials from CaO–SiO2 (T1/PLGA, S1/PLGA) compared to composites with respective bioglass particles from the CaO–P2O5–SiO2(T2/PLGA, S2/PLGA). Our results showed that rate of Si and Ca release from the gel-derived glasses and P uptake from SBF are dependent on both: the concentration of respective ions in the materials and the presence of phosphates in their structure. For materials modified with gel-derived glasses from Al2O3–SiO2 system no significant surface changes during contact with SBF were observed, and it seems that their behavior in physiological solution indicate that they are bio-inert materials.

Visualising Chemical Composition and Reaction Kinetics by the near Infrared Multispectral Imaging Technique

2000 ◽  
Vol 8 (2) ◽  
pp. 87-99 ◽  
Author(s):  
Chieu D. Tran
Keyword(s):  
Peptide Synthesis ◽  
Near Infrared ◽  
Multispectral Imaging ◽  
Solid Phase ◽  
Imaging Technique ◽  
Solid Phase Peptide Synthesis ◽  
Imaging Spectrometer ◽  
Kinetic Determination ◽  
Nir Imaging ◽  
Single Pixel

A new multispectral imaging spectrometer which is capable of simultaneously recording spectral images in the visible and near infrared has been developed. In this instrument, an acousto-optic tunable filter (AOTF) is used to diffract an unpolarised incident light into two diffracted beams with orthogonal polarisation. One of the beams is detected by a silicon camera for the visible region while the other is detected in the near infrared (NIR) region (from 1000 to 1700nm) with an NIR camera. The imaging spectrometer is sensitive, inexpensive and field deployable because it is based on a camera using the recently available InGaAs focal plane arrays which are low-cost and can be sensitively operated at room temperature. The imaging spectrometer was used for measurements which previously were not possible. These include the kinetic determination of curing of an epoxy resin by amine, and the detection of reaction products from solid-phase peptide synthesis. Rates of reactions between epoxy and amine were found to be very inhomogeneous. Because of this kinetic inhomogeneity, differences in the degrees of cure at different positions within the sample can be as high as 37% when data from only a single pixel were used for calculation. The inhomogeneity was not observed if the average of a large number of pixels was used. The NIR imaging spectrometer was also used for the kinetic determination and identification of products formed during the solid phase peptide synthesis of glycine, alanine and valine mediated by aminomethylstyrene resin beads. Because this NIR imaging spectrometer can measure spectra at different positions within a sample, it was used for the first demonstration in which reactions of three different solid-phase peptide syntheses (in a three-compartment cell) were simultaneously monitored. Since relatively good spectra can be obtained by using data recorded by a single pixel and because the NIR camera has 240×320 pixels, this NIR multispectral imaging technique is not limited to three-compartment cell used in this study but rather can be used as the detection method for solid-phase peptide synthesis in combinatorial chemistry.

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