Etching Behavior of Silicon Nanowires with HF and NH4F and Surface Characterization by Attenuated Total Reflection Fourier Transform Infrared Spectroscopy:  Similarities and Differences between One-Dimensional and Two-Dimensional Silicon Surfaces

2005 ◽  
Vol 109 (21) ◽  
pp. 10871-10879 ◽  
Author(s):  
W. W. Chen ◽  
X. H. Sun ◽  
S. D. Wang ◽  
S. T. Lee ◽  
Boon K. Teo
Keyword(s):  
Fourier Transform ◽  
Silicon Nanowires ◽  
Surface Characterization ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Silicon Surfaces ◽  
Two Dimensional ◽  
One Dimensional ◽  
Etching Behavior ◽  
Similarities And Differences

Soy Protein Isolate and Glycerol Hydrogen Bonding Using Two-Dimensional Correlation (2D-COS) Attenuated Total Reflection Fourier Transform Infrared (ATR FT-IR) Spectroscopy

2017 ◽  
Vol 71 (11) ◽  
pp. 2437-2445 ◽  
Author(s):  
Zhiwei Yan ◽  
Qian Li ◽  
Pudun Zhang
Keyword(s):  
Fourier Transform ◽  
Soy Protein ◽  
Soy Protein Isolate ◽  
Protein Isolate ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Two Dimensional ◽  
Ft Ir ◽  
Β Sheet ◽  
Ft Ir Spectroscopy

It is a trend to substitute bioplastics for petroleum-based plastics in food packaging. Glycerol-plasticized soy protein isolate (SPI) is promising as a replacement for traditional petroleum-based plastics. Hydrogen bonding (H-bonding) plays a key role in plasticization of SPI film. However, few publications are concerned with the interactions of SPI and glycerol at the molecular level. In this paper, attenuated total reflection Fourier transform infrared (ATR FT-IR) spectroscopy was applied to investigate the effect of H-bonding on the secondary structures of glycerol-plasticized SPI films and thus on the plasticization. An “S” profile of the H-bonding between SPI and glycerol with an abrupt jump in the glycerol range of 10–30% was achieved. For more in-depth investigation of the H-bonding, two-dimensional correlation spectroscopy (2D-COS) and perturbation-correlation moving-window two-dimensional (PCMW2D) analyses were applied to the amide I and II bands of SPI films spectra series. The conformation change sequences under the effect of H-bonding were revealed. When glycerol was involved, it entered into the β-sheet and the H-bonds of the SPI peptide backbone (C = O···H–N–) were replaced by the new H-bonds between SPI and glycerol (C = O···H–O–). The transformations of parallel β-sheet to β-turn in the range of 0–20% and anti-parallel β-sheet to β-turn in the range of 20–35% were obtained. In the 35–60% concentration range, the β-sheet was first changed to a transition state conformation, then together with the β-turn, to the random coil. The 2D-COS results clearly suggest that the conformations of SPI gradually change from the ordered to the less ordered and disordered, which significantly improve the plasticity of SPI film.

Dense Nanorods for Enhanced Sensing of Complex Mixed Solution

2014 ◽  
Vol 1049-1050 ◽  
pp. 11-14
Author(s):  
Qiong Chan Gu ◽  
Xiao Xiao Jiang ◽  
Jiang Tao Lv ◽  
Guang Yuan Si
Keyword(s):  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Interference Lithography ◽  
Mixed Solution ◽  
Two Dimensional ◽  
Ion Milling ◽  
One Dimensional ◽  
Wafer Scale ◽  
Optical Responses

We show wafer-scale nanorods fabrication using interference lithography and ion milling techniques. Both one-dimensional (1D) and two-dimensional (2D) nanogratings are achieved. Complementary structures of nanorods and nanoholes are demonstrated with tunable and enhanced optical responses. By combining such nanostructures with attenuated total reflection (ATR) components, we show significantly enhanced absorbance measurements. The results shown in this paper may enable new opportunities for plasmon-assisted sensing and spectroscopy.

scholarly journals Distinguishing active from quiescent disease in ANCA-associated vasculitis using attenuated total reflection Fourier-transform infrared spectroscopy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Adam D. Morris ◽  
Camilo L. M. Morais ◽  
Kássio M. G. Lima ◽  
Daniel L. D. Freitas ◽  
Mark E. Brady ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Unmet Need ◽  
Fourier Transform Infrared ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Remission Induction ◽  
Disease Remission ◽  
Anca Associated Vasculitis ◽  
Active Disease ◽  
Quiescent Disease

AbstractThe current lack of a reliable biomarker of disease activity in anti-neutrophil cytoplasmic autoantibody (ANCA) associated vasculitis poses a significant clinical unmet need when determining relapsing or persisting disease. In this study, we demonstrate for the first time that attenuated total reflection Fourier-transform infrared (ATR-FTIR) spectroscopy offers a novel and functional candidate biomarker, distinguishing active from quiescent disease with a high degree of accuracy. Paired blood and urine samples were collected within a single UK centre from patients with active disease, disease remission, disease controls and healthy controls. Three key biofluids were evaluated; plasma, serum and urine, with subsequent chemometric analysis and blind predictive model validation. Spectrochemical interrogation proved plasma to be the most conducive biofluid, with excellent separation between the two categories on PC2 direction (AUC 0.901) and 100% sensitivity (F-score 92.3%) for disease remission and 85.7% specificity (F-score 92.3%) for active disease on blind predictive modelling. This was independent of organ system involvement and current ANCA status, with similar findings observed on comparative analysis following successful remission-induction therapy (AUC > 0.9, 100% sensitivity for disease remission, F-score 75%). This promising technique is clinically translatable and warrants future larger study with longitudinal data, potentially aiding earlier intervention and individualisation of treatment.

Sign in / Sign up

Export Citation Format

Share Document