Continuous Droplet Flow Synthesis of a Near-Infrared Responsive Push–Pull Copolymer toward Large Scale Implementation of Organic Photodetectors

Omar Beckers; Sam Gielen; Frederik Verstraeten; Pieter Verstappen; Laurence Lutsen; Koen Vandewal; Wouter Maes

doi:10.1021/acsapm.0c00998

An optical observational cluster mass function at z ∼ 1 with the ORELSE survey

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/stab300 ◽

2021 ◽

Vol 502 (3) ◽

pp. 3942-3954

Author(s):

D Hung ◽

B C Lemaux ◽

R R Gal ◽

A R Tomczak ◽

L M Lubin ◽

...

Keyword(s):

Monte Carlo ◽

Large Scale ◽

Near Infrared ◽

Function Analysis ◽

Voronoi Tessellation ◽

Cosmological Parameters ◽

Mass Range ◽

Mass Function ◽

Cluster Mass ◽

Theoretical Mass

ABSTRACT We present a new mass function of galaxy clusters and groups using optical/near-infrared (NIR) wavelength spectroscopic and photometric data from the Observations of Redshift Evolution in Large-Scale Environments (ORELSE) survey. At z ∼ 1, cluster mass function studies are rare regardless of wavelength and have never been attempted from an optical/NIR perspective. This work serves as a proof of concept that z ∼ 1 cluster mass functions are achievable without supplemental X-ray or Sunyaev-Zel’dovich data. Measurements of the cluster mass function provide important contraints on cosmological parameters and are complementary to other probes. With ORELSE, a new cluster finding technique based on Voronoi tessellation Monte Carlo (VMC) mapping, and rigorous purity and completeness testing, we have obtained ∼240 galaxy overdensity candidates in the redshift range 0.55 < z < 1.37 at a mass range of 13.6 < log (M/M⊙) < 14.8. This mass range is comparable to existing optical cluster mass function studies for the local universe. Our candidate numbers vary based on the choice of multiple input parameters related to detection and characterization in our cluster finding algorithm, which we incorporated into the mass function analysis through a Monte Carlo scheme. We find cosmological constraints on the matter density, Ωm, and the amplitude of fluctuations, σ8, of $\Omega _{m} = 0.250^{+0.104}_{-0.099}$ and $\sigma _{8} = 1.150^{+0.260}_{-0.163}$. While our Ωm value is close to concordance, our σ8 value is ∼2σ higher because of the inflated observed number densities compared to theoretical mass function models owing to how our survey targeted overdense regions. With Euclid and several other large, unbiased optical surveys on the horizon, VMC mapping will enable optical/NIR cluster cosmology at redshifts much higher than what has been possible before.

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Principal component analysis tomography in near-infrared integral field spectroscopy of young stellar objects – I. Revisiting the high-mass protostar W33A

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/stab358 ◽

2021 ◽

Vol 503 (1) ◽

pp. 270-291

Author(s):

F Navarete ◽

A Damineli ◽

J E Steiner ◽

R D Blum

Keyword(s):

Large Scale ◽

Near Infrared ◽

Rotation Axis ◽

Principal Component ◽

Young Stellar Objects ◽

High Mass ◽

Continuum Emission ◽

Rotating Disc ◽

Stellar Objects ◽

K Band

ABSTRACT W33A is a well-known example of a high-mass young stellar object showing evidence of a circumstellar disc. We revisited the K-band NIFS/Gemini North observations of the W33A protostar using principal components analysis tomography and additional post-processing routines. Our results indicate the presence of a compact rotating disc based on the kinematics of the CO absorption features. The position–velocity diagram shows that the disc exhibits a rotation curve with velocities that rapidly decrease for radii larger than 0.1 arcsec (∼250 au) from the central source, suggesting a structure about four times more compact than previously reported. We derived a dynamical mass of 10.0$^{+4.1}_{-2.2}$ $\rm {M}_\odot$ for the ‘disc + protostar’ system, about ∼33 per cent smaller than previously reported, but still compatible with high-mass protostar status. A relatively compact H2 wind was identified at the base of the large-scale outflow of W33A, with a mean visual extinction of ∼63 mag. By taking advantage of supplementary near-infrared maps, we identified at least two other point-like objects driving extended structures in the vicinity of W33A, suggesting that multiple active protostars are located within the cloud. The closest object (Source B) was also identified in the NIFS field of view as a faint point-like object at a projected distance of ∼7000 au from W33A, powering extended K-band continuum emission detected in the same field. Another source (Source C) is driving a bipolar $\rm {H}_2$ jet aligned perpendicular to the rotation axis of W33A.

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Gram-scale synthesis of a neodymium chelate as a spectral CT and second near-infrared window imaging agent for visualizing the gastrointestinal tract in vivo

Journal of Materials Chemistry B ◽

10.1039/d0tb02276d ◽

2021 ◽

Author(s):

Pengrui Zhuang ◽

Ke Xiang ◽

Xiangxi Meng ◽

Guohe Wang ◽

Ziyuan Li ◽

...

Keyword(s):

Gastrointestinal Tract ◽

Fluorescence Imaging ◽

Large Scale ◽

Near Infrared ◽

Imaging Agent ◽

Spectral Ct ◽

Green Method ◽

Infrared Window

A facile and green method was developed to fabricate Nd-DTPA on a large scale without byproducts for CT/spectral CT and NIR II fluorescence imaging of the gastrointestinal tract in vivo.

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Stacked Dual‐Wavelength Near‐Infrared Organic Photodetectors

Advanced Optical Materials ◽

10.1002/adom.202001784 ◽

2020 ◽

pp. 2001784

Author(s):

Yazhong Wang ◽

Bernhard Siegmund ◽

Zheng Tang ◽

Zaifei Ma ◽

Jonas Kublitski ◽

...

Keyword(s):

Near Infrared ◽

Dual Wavelength ◽

Organic Photodetectors

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Enhancing sub-bandgap external quantum efficiency by photomultiplication for narrowband organic near-infrared photodetectors

Nature Communications ◽

10.1038/s41467-021-24500-2 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Jonas Kublitski ◽

Axel Fischer ◽

Shen Xing ◽

Lukasz Baisinger ◽

Eva Bittrich ◽

...

Keyword(s):

Charge Transfer ◽

Quantum Efficiency ◽

External Quantum Efficiency ◽

Near Infrared ◽

Optical Cavity ◽

Hole Injection ◽

Visible Range ◽

Absorption Region ◽

Electromagnetic Signals ◽

Organic Photodetectors

AbstractDetection of electromagnetic signals for applications such as health, product quality monitoring or astronomy requires highly responsive and wavelength selective devices. Photomultiplication-type organic photodetectors have been shown to achieve high quantum efficiencies mainly in the visible range. Much less research has been focused on realizing near-infrared narrowband devices. Here, we demonstrate fully vacuum-processed narrow- and broadband photomultiplication-type organic photodetectors. Devices are based on enhanced hole injection leading to a maximum external quantum efficiency of almost 2000% at −10 V for the broadband device. The photomultiplicative effect is also observed in the charge-transfer state absorption region. By making use of an optical cavity device architecture, we enhance the charge-transfer response and demonstrate a wavelength tunable narrowband photomultiplication-type organic photodetector with external quantum efficiencies superior to those of pin-devices. The presented concept can further improve the performance of photodetectors based on the absorption of charge-transfer states, which were so far limited by the low external quantum efficiency provided by these devices.

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Real time in-line monitoring of large scale Bacillus fermentations with near-infrared spectroscopy

Journal of Biotechnology ◽

10.1016/j.jbiotec.2014.09.004 ◽

2014 ◽

Vol 189 ◽

pp. 120-128 ◽

Cited By ~ 22

Author(s):

José Alves-Rausch ◽

Roland Bienert ◽

Christian Grimm ◽

Dirk Bergmaier

Keyword(s):

Infrared Spectroscopy ◽

Real Time ◽

Near Infrared Spectroscopy ◽

Large Scale ◽

Near Infrared

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Integrated Multi-channel PPG and ECG System for Cardiovascular Risk Assessment

Proceedings ◽

10.3390/proceedings2019027008 ◽

2019 ◽

Vol 27 (1) ◽

pp. 8 ◽

Cited By ~ 2

Author(s):

David Perpetuini ◽

Antonio Maria Chiarelli ◽

Vincenzo Vinciguerra ◽

Piergiusto Vitulli ◽

Sergio Rinella ◽

...

Keyword(s):

Cardiovascular Risk ◽

Arterial Stiffness ◽

Pressure Wave ◽

Large Scale ◽

Near Infrared ◽

Infrared Light ◽

Invasive Technique ◽

Cardiovascular Risk Assessment ◽

Non Invasive ◽

Cuff Occlusion

Photoplethysmography (PPG) is a non-invasive technique that employs near infrared light to estimate periodic oscillations in blood volume within arteries caused by the pulse pressure wave. Importantly, combined Electrocardiography (ECG) and PPG can be employed to quantify arterial stiffness. The capabilities of a home-made multi-channel PPG-ECG device (7 PPG probes, 4 ECG derivations) to evaluate arterial ageing were assessed. The high numerosity of channels allowed to estimate arterial stiffness at multiple body locations, without supra-systolic cuff occlusion, providing a fast and accurate examination of cardiovascular status and potentially allowing large scale clinical screening of cardiovascular risk.

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Rapid evaluation of pasture quality for a critically endangered mammal, the northern hairy-nosed wombat (Lasiorhinus krefftii)

Wildlife Research ◽

10.1071/wr00050 ◽

2002 ◽

Vol 29 (1) ◽

pp. 91 ◽

Cited By ~ 10

Author(s):

Andrew P. Woolnough ◽

William J. Foley

Keyword(s):

Large Scale ◽

Nutritive Value ◽

Near Infrared ◽

Nitrogen Concentration ◽

Water Soluble ◽

Critically Endangered ◽

Soluble Carbohydrates ◽

Dry Matter Digestibility ◽

Acid Detergent Fibre

Near-infrared spectroscopy (NIRS) was used to predict the nutritive value of forage species available to the critically endangered northern hairy-nosed wombat (Lasiorhinus krefftii). Nutritive attributes of the forage successfully estimated included total nitrogen concentration, fibre (including neutral detergent fibre, acid detergent fibre and acid lignin), organic matter, water soluble carbohydrates and in vitro dry matter digestibility. The reported results demonstrate the seasonal variability of the forage resource available to L. krefftii in its tropical savanna habitat. Multivariate modelling of the spectra enabled the nutritive value of forage samples to be estimated with coefficients of determination (r2) of 0.770–0.995 and standard errors of the cross-validation of 0.070–2.850 using a modified partial least-squares analysis technique. The standard error of the laboratory was 0.02–1.42. This study demonstrates that broad-based NIRS predictive equations can be used to predict the nutritive value of a number of plant types available to a herbivore over time. By using NIRS the analyst can rapidly analyse large numbers of samples with limited reduction of precision, thereby enabling large-scale ecological applications that may have previously been impeded by time and costs.

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Sustainable, Rapid Synthesis of Bright-Luminescent CuInS2-ZnS Alloyed Nanocrystals: Multistage Nano-xenotoxicity Assessment and Intravital Fluorescence Bioimaging in Zebrafish-Embryos

Scientific Reports ◽

10.1038/srep26078 ◽

2016 ◽

Vol 6 (1) ◽

Cited By ~ 21

Author(s):

S. Shashank Chetty ◽

S. Praneetha ◽

Sandeep Basu ◽

Chetana Sachidanandan ◽

A. Vadivel Murugan

Keyword(s):

Large Scale ◽

Near Infrared ◽

Organic Dyes ◽

Low Cost ◽

Fluorescence Emission ◽

Zebrafish Embryos ◽

Fluorescence Bioimaging ◽

Rapid Labeling

Abstract Near-infrared (NIR) luminescent CuInS2-ZnS alloyed nanocrystals (CIZS-NCs) for highly fluorescence bioimaging have received considerable interest in recent years. Owing, they became a desirable alternative to heavy-metal based-NCs and organic dyes with unique optical properties and low-toxicity for bioimaging and optoelectronic applications. In the present study, bright and robust CIZS-NCs have been synthesized within 5 min, as-high-as 230 °C without requiring any inert-gas atmosphere via microwave-solvothermal (MW-ST) method. Subsequently, the in vitro and in vivo nano-xenotoxicity and cellular uptake of the MUA-functionalized CIZS-NCs were investigated in L929, Vero, MCF7 cell lines and zebrafish-embryos. We observed minimal toxicity and acute teratogenic consequences upto 62.5 μg/ml of the CIZS-NCs in zebrafish-embryos. We also observed spontaneous uptake of the MUA-functionalized CIZS-NCs by 3 dpf older zebrafish-embryos that are evident through bright red fluorescence-emission at a low concentration of 7.8 μg/mL. Hence, we propose that the rapid, low-cost, large-scale “sustainable” MW-ST synthesis of CIZS-NCs, is an ideal bio-nanoprobe with good temporal and spatial resolution for rapid labeling, long-term in vivo tracking and intravital-fluorescence-bioimaging (IVBI).

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