16,106 results match your criteria near-infrared nir


Plasmon-Triggered Upconversion Emissions and Hot Carrier Injection for Combinatorial Photothermal and Photodynamic Cancer Therapy.

ACS Appl Mater Interfaces 2021 Dec 2. Epub 2021 Dec 2.

Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Republic of Korea.

Despite the unique ability of lanthanide-doped upconversion nanoparticles (UCNPs) to convert near-infrared (NIR) light to high-energy UV-vis radiation, low quantum efficiency has rendered their application unpractical in biomedical fields. Here, we report anatase titania-coated plasmonic gold nanorods decorated with UCNPs (Au [email protected]@UCNPs) for combinational photothermal and photodynamic therapy to treat cancer. Our novel architecture employs the incorporation of an anatase titanium dioxide (aTiO) photosensitizer as a spacer and exploits the localized surface plasmon resonance (LSPR) properties of the Au core. Read More

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December 2021

Acceptor engineering of small-molecule fluorophores for NIR-II fluorescence and photoacoustic imaging.

J Mater Chem B 2021 Dec 2. Epub 2021 Dec 2.

Shenzhen Key Laboratory of Smart Healthcare Engineering, Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.

Fluorescence imaging in the second near-infrared window (NIR-II) has been an emerging technique in diverse applications with high sensitivity/resolution and deep tissue penetration. To date, the design principle of the reported NIR-II organic fluorophores has heavily relied on benzo[1,2-:4,5-']bis([1,2,5]thiadiazole) (BBTD) as a strong electron acceptor. Here, we report the rational design and synthesis of a NIR-II fluorescent molecule with the rarely used [1,2,5]thiadiazolo[3,4-]benzotriazole (TBZ) core to replace BBTD as the electron acceptor. Read More

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December 2021

A near-infrared optical nanosensor for measuring aerobic respiration in microbial systems.

Analyst 2021 Dec 2. Epub 2021 Dec 2.

Chemical and Biological Engineering Department, Colorado School of Mines, Golden, CO, USA.

We developed a ratiometric oxygen-sensitive nanosensor and demonstrated application in monitoring metabolic oxygen consumption in microbial samples over time. Based on a near-infrared (NIR) emitting oxygen-quenched luminophore, platinum(II) octaethylporphine ketone (PtOEPK), along with a stable dioctadecyl dicarbocyanine reference dye (DiD), this nanosensor system provides an advantageous approach for overcoming imaging issues in biological systems, such as autofluorescence and optical scattering in the visible wavelength region. The dyes are encapsulated within a polymer-based nanoparticle matrix to maintain them at a constant ratio in biological samples, precluding the need for complex synthetic approaches. Read More

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December 2021

Bandgap Modulation of CsAgInX (X = Cl and Br) Double Perovskite Nano- and Microcrystals via Cu Doping.

ACS Omega 2021 Oct 8;6(41):26952-26958. Epub 2021 Oct 8.

School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan 44919, Republic of Korea.

Recently, the double perovskite CsAgInCl, which has high stability and low toxicity, has been proposed as a potential alternative to Pb-based perovskites. However, the calculated parity-allowed transition bandgap of CsAgInCl is 4.25 eV; this wide bandgap makes it difficult to use as an efficient solar absorber. Read More

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October 2021

Determination and understanding of lead-lag between in-line NIR tablet press feed frame and off-line NIR tablet measurements.

Int J Pharm 2021 Nov 28:121328. Epub 2021 Nov 28.

Ghent University, Laboratory of Pharmaceutical Process Analytical Technology, Ottergemsesteenweg 460, 9000 Ghent, Belgium. Electronic address:

The influence of different tableting process parameters on lead-lag was studied by collecting in-line near-infrared (NIR) spectra in the filling chamber of the tablet press feed frame and off-line NIR tablet data. Lead-lag is defined as the difference in time and API concentration between the measured in-line feed frame NIR response and the off-line NIR tablet data. Lead-lag results from the product formulation blend undergoing additional mixing after passing the NIR probe inside the feed frame, before being filled into the dies of the tablet press. Read More

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November 2021

Near-Infrared Emissive Lanthanide Metal-Organic Frameworks for Targeted Biological Imaging and pH-Controlled Chemotherapy.

ACS Appl Mater Interfaces 2021 Dec 1. Epub 2021 Dec 1.

Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, School of Chemistry and Chemical Engineering, Inner Mongolia University, Hohhot 010021, P.R. China.

Near-infrared window II (NIR-II, 1000-1700 nm) imaging displays the advantages in deep-tissue high-contrast imaging in vivo on the strength of the high temporal-spatial resolution and deeper penetration. However, the clinical utility of NIR-II imaging agents is limited by their single function. Herein, for the first time, we report the design of a multifunctional drug delivery system (DDS) assembly, CQ/[email protected] nanohybrids, with NIR-II fluorescence (1067 nm), large Stokes shifts, and ultrahigh quantum yield, which combined targeted NIR-II luminescence bioimaging and pH-controlled drug delivery. Read More

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December 2021

Transforming a Sword into a Knife: Persistent Phototoxicity Inhibition and Alternative Therapeutical Activation of Highly-Photosensitive Phytochlorin.

ACS Nano 2021 Dec 1. Epub 2021 Dec 1.

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.

The phototoxicity of photosensitizers (PSs) is a double-edged sword with one edge beneficial for destroying tumors while the other is detrimental to normal tissues, and the conventional "OFF-ON" strategy provides temporary inhibition so that phototoxicity would come sooner or later due to the inevitable retention and transformation of PSs . We herein put forward a strategy to convert "double-edged sword" PSs into "single-edged knife" ones with simultaneously persistent phototoxicity inhibition and alternative multiple therapeutical activation. The Chlorin e6 (Ce6) as the PS model directly assembles with Cu ions into nanoscale frameworks (nFs) whose Cu-coordination includes both carboxyl groups and a porphyrin ring of Ce6 instead of Fe/Mn-coordination with only carboxyl groups. Read More

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December 2021

Flexible Titanium Nitride/Germanium-Tin Photodetectors Based on Sub-Bandgap Absorption.

ACS Appl Mater Interfaces 2021 Dec 1. Epub 2021 Dec 1.

School of Electrical and Electronic Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore, Singapore.

We report an enhanced performance of flexible titanium nitride/germanium-tin (TiN/GeSn) photodetectors (PDs) with an extended photodetection range based on sub-bandgap absorption. Single-crystalline GeSn membranes transfer-printed on poly(ethylene terephthalate) are integrated with plasmonic TiN to form a TiN/GeSn heterojunction. Formation of the heterojunction creates a Schottky contact between the TiN and GeSn. Read More

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December 2021

NIR Light-triggered Quantitative Pulsed Drug Release.

Adv Healthc Mater 2021 Dec 1:e2102362. Epub 2021 Dec 1.

Department of Pharmacology, School of Basic Medical Sciences & Center of Medical, Research and Innovation, Shanghai Pudong Hospital & State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200032, China.

Quantitative drug release is important for improving therapeutic efficiency and avoiding side effects. While using long-term delivery system for repeated therapy, it is indispensable but challenging to accurately control the drug dosing. Herein, a photocleavable prodrug-loaded hydrogel is proposed for near infrared (NIR) light-triggered quantitative pulsed drug release. Read More

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December 2021

Near-Infrared Light-Responsive SERS Tags Enable Positioning and Monitoring of the Drug Release of Photothermal Nanomedicines In Vivo.

Anal Chem 2021 Dec 1. Epub 2021 Dec 1.

CAS Key Laboratory of Coastal Environmental Processes and Ecological Remediation, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China.

Understanding the in vivo behavior of photothermal nanomedicines (PTNMs) is important for drug development and evaluation. However, it is still very challenging. Herein, two key parameters, i. Read More

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December 2021

Surfactant-Stripped Semiconducting Polymer Micelles for Tumor Theranostics and Deep Tissue Imaging in the NIR-II Window.

Small 2021 Dec 1:e2104132. Epub 2021 Dec 1.

School of Chemical Engineering and Technology, Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Tianjin, 300350, China.

Photoacoustic imaging (PA) in the second near infrared (NIR-II) window presents key advantages for deep tissue imaging owing to reduced light scattering and low background signal from biological structures. Here, a thiadiazoloquinoxaline-based semiconducting polymer (SP) with strong absorption in the NIR-II region is reported. After encapsulation of SP in Pluronic F127 (F127) followed by removal of excess surfactant, a dual functional polymer system named surfactant-stripped semiconductor polymeric micelles (SSS-micelles) are generated with water solubility, storage stability, and high photothermal conversion efficiency, permitting tumor theranostics in a mouse model. Read More

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December 2021

A Bright, Renal-Clearable NIR-II Brush Macromolecular Probe with Long Blood Circulation Time for Kidney Disease Bioimaging.

Angew Chem Int Ed Engl 2021 Nov 30. Epub 2021 Nov 30.

Fudan University - Handan Campus: Fudan University, Department of Chemistry, CHINA.

Early detection of kidney disease is of vital importance due to their current prevalence worldwide. Fluorescence imaging, especially in the second near-infrared window (NIR-II) has been regarded as a promising technique for the early diagnosis of kidney disease due to the superior resolution and sensitivity. However, the reported NIR-II organic renal-clearable probes are hampered by their low brightness (ε max Φ f>1000 nm < 10 M -1 cm -1 ) and limited blood circulation time ( t 1/2 < 2 h), which impede the targeted imaging performance. Read More

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November 2021

Predicting sensitivity of recently harvested tomatoes and tomato sepals to future fungal infections.

Sci Rep 2021 Nov 30;11(1):23109. Epub 2021 Nov 30.

Wageningen University and Research, 6708 PB, Wageningen, The Netherlands.

Tomato is an important commercial product which is perishable by nature and highly susceptible to fungal incidence once it is harvested. Not all tomatoes are equally vulnerable to pathogenic fungi, and an early detection of the vulnerable ones can help in taking timely preventive actions, ranging from isolating tomato batches to adjusting storage conditions, but also in making right business decisions like dynamic pricing based on quality or better shelf life estimate. More importantly, early detection of vulnerable produce can help in taking timely actions to minimize potential post-harvest losses. Read More

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November 2021

Detection of wavelength in the range from ultraviolet to near infrared light using two parallel PtSe/thin Si Schottky junctions.

Mater Horiz 2021 Jul 28;8(7):1976-1984. Epub 2021 Apr 28.

School of Electronic Science and Applied Physics, Hefei University of Technology, Hefei, 230009, China.

A wavelength sensor as a representative optoelectronic device plays an important role in many fields including visible light communication, medical diagnosis, and image recognition. In this study, a wavelength-sensitive detector with a new operation mechanism was reported. The as-proposed wavelength sensor which is composed of two parallel PtSe/thin Si Schottky junction photodetectors is capable of distinguishing wavelength in the range from ultraviolet to near infrared (UV-NIR) light (265 to 1050 nm), in that the relationship between the photocurrent ratio of both photodetectors and incident wavelength can be numerically described by a monotonic function. Read More

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Indium nanoparticle-based surface enhanced fluorescence from deep ultraviolet to near-infrared: A theoretical study.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Nov 14:120603. Epub 2021 Nov 14.

Department of Physics, Indian Institute of Technology Patna, Bihar 801103, India. Electronic address:

Herein, for the first time, we report a theoretical investigation on Indium nanoparticle-based surface enhanced fluorescence (SEF) from deep ultraviolet (UV) to near-infrared (NIR). In the beginning, the far- and near-field plasmonic properties of the Indium nanospheres of different sizes are studied to extract the wavelengths of lower and higher-order localized surface plasmon modes and the corresponding local electric field enhancement (EFE) values. Later, the dependence of the SEF enhancement with the separation between the fluorophore and nanoparticle (d), fluorescence, and excitation wavelengths is studied systematically. Read More

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November 2021

High-Performance Near-Infrared Aggregation-Induced Emission Luminogen with Mitophagy Regulating Capability for Multimodal Cancer Theranostics.

ACS Nano 2021 Nov 29. Epub 2021 Nov 29.

Shenzhen Institute of Aggregate Science and Technology, School of Science and Engineering, The Chinese University of Hong Kong, Shenzhen, 2001 Longxiang Boulevard, Longgang District, Shenzhen 518172, China.

The construction of intelligent near-infrared (NIR) fluorophores for high specificity to cancer cells and application in multiple therapeutic modalities is crucial for precise cancer diagnostic and therapy. In this study, an aggregation-induced emission-active NIR fluorophore (TACQ) with mitophagy-modulating activity was synthesized and developed for mitochondrial targeting multimodal cancer theranostics. The strengthened push-pull interaction extended the emission of TACQ into the NIR-II region (>1000 nm). Read More

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November 2021

BSA-Coated Gold Nanorods for NIR-II Photothermal Therapy.

Nanoscale Res Lett 2021 Nov 29;16(1):170. Epub 2021 Nov 29.

Research Laboratory for Biomedical Optics and Molecular Imaging, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, 518055, Guangdong, China.

The second near infrared window is considered to be the optimal optical window for medical imaging and therapy as its capability of deep tissue penetration. The preparation of the gold nanorods with long wavelength absorption and low cytotoxicity is still a challenge. A series gold nanorods with large aspect ratio have been synthesized. Read More

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November 2021

Highly Selective Fluorescent Probe Design for Visualizing Hepatic Hydrogen Sulfide in the Pathological Progression of Nonalcoholic Fatty Liver.

Anal Chem 2021 Nov 29. Epub 2021 Nov 29.

State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.

Hydrogen sulfide (HS), emerging as an important gaseous signal, has attracted more and more attention for its key role in chronic fatty liver diseases. However, lacking tools for HS-specific in situ detection, the changes of endogenous hepatic HS levels in the pathological progression of chronic liver diseases are still unclear. To this end, we adopted a strategy of combining molecular probe design and nanofunctionalization to develop a highly selective near-infrared (NIR) fluorescent probe, which allows in vivo real-time monitoring of hepatic HS levels in the process of nonalcoholic fatty liver disease (NAFLD). Read More

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November 2021

Lenvatinib and CuS nanocrystals co-encapsulated in poly(D,L-lactide--glycolide) for synergistic chemo-photothermal therapy against advanced hepatocellular carcinoma.

J Mater Chem B 2021 Nov 29. Epub 2021 Nov 29.

Cancer Center, Union Hospital, Tongji Medical College of Huazhong University of Science and Technology, Wuhan, Hubei, 430022, China.

Lenvatinib (LT) is gradually replacing sorafenib as an alternative targeted drug against advanced hepatocellular carcinoma (HCC). However, the anticancer effects of LT are still limited because of its low cytotoxicity, multidrug resistance (MDR), and tumor relapse. Herein, we constructed a smart biophotonic nanoplatform to overcome the barriers preventing high performance. Read More

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November 2021

Near-Infrared-II Quantum Dots for In Vivo Imaging and Cancer Therapy.

Small 2021 Nov 26:e2104567. Epub 2021 Nov 26.

State Key Laboratory of Medicinal Chemical Biology, Tianjin Key Laboratory of Biosensing and Molecular Recognition, Research Center for Analytical Sciences, College of Chemistry and School of Medicine, Nankai University, Tianjin, 300071, P. R. China.

In vivo fluorescence imaging can perform real-time, noninvasive, and high spatiotemporal resolution imaging to accurately obtain the dynamic biological information in vivo, which plays significant roles in the early diagnosis and treatment of cancer. However, traditional in vivo fluorescence imaging usually operates in the visible and near-infrared (NIR)-I windows, which are severely interfered by the strong tissue absorption, tissue scattering, and autofluorescence. The emergence of NIR-II imaging at 1000-1700 nm significantly breaks through the imaging limitations in deep tissues, due to less tissue scattering and absorption. Read More

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November 2021

Ultra-sensitive responsive near-infrared fluorescent nitroreductase probe with strong specificity for imaging tumor and detecting the invasiveness of tumor cells.

Spectrochim Acta A Mol Biomol Spectrosc 2021 Nov 17:120634. Epub 2021 Nov 17.

Department of Oral and Maxillofacial Surgery, Shandong Provincial Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong 250021, China.

Hypoxia plays an important role in cancer progression, which is a characteristic feature of the tumor micro-environment and reflects the invasiveness of tumor cells. Nitroreductase (NTR) is overexpressed in hypoxic tumors, which making it an efficient target for detecting the hypoxic state in tumor. In this work, a new type of nitro-based fluorescent probe, named HNT-NTR, has been proposed, HNT-NTR could detect specifically and rapidly the NTR degree, which reflects the level of hypoxia in bidimensional (2D) tumor cells, three-dimensional (3D) tumor spheres and even the real tumors in vivo without biological toxicity. Read More

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November 2021

Gold Nanorod-Decorated Metallic MoS Nanosheets for Synergistic Photothermal and Photodynamic Antibacterial Therapy.

Nanomaterials (Basel) 2021 Nov 14;11(11). Epub 2021 Nov 14.

International Ph.D. Program in Biomedical Engineering, College of Biomedical Engineering, Taipei Medical University, Taipei 11031, Taiwan.

Light-responsive nanocomposites have become increasingly attractive in the biomedical field for antibacterial applications. Visible-light-activated metallic molybdenum disulfide nanosheets (1T-MoS NSs) and plasmonic gold nanorods (AuNRs) with absorption at a wavelength of 808 nm were synthesized. AuNR nanocomposites decorated onto 1T-MoS NSs ([email protected]) were successfully prepared by electrostatic adsorption for phototherapy applications. Read More

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November 2021

Bioactivity of PEGylated Graphene Oxide Nanoparticles Combined with Near-Infrared Laser Irradiation Studied in Colorectal Carcinoma Cells.

Nanomaterials (Basel) 2021 Nov 14;11(11). Epub 2021 Nov 14.

Institute of Molecular Biology "Acad. R. Tsanev", Bulgarian Academy of Sciences, "Acad. Georgi Bonchev" Str., Bl. 21, 1113 Sofia, Bulgaria.

Central focus in modern anticancer nanosystems is given to certain types of nanomaterials such as graphene oxide (GO). Its functionalization with polyethylene glycol (PEG) demonstrates high delivery efficiency and controllable release of proteins, bioimaging agents, chemotherapeutics and anticancer drugs. GO-PEG has a good biological safety profile, exhibits high NIR absorbance and capacity in photothermal treatment. Read More

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November 2021

Stable Aqueous Colloidal Solutions of Nd: LaF Nanoparticles, Promising for Luminescent Bioimaging in the Near-Infrared Spectral Range.

Nanomaterials (Basel) 2021 Oct 26;11(11). Epub 2021 Oct 26.

Prokhorov General Physics Institute of the Russian Academy of Sciences, 119991 Moscow, Russia.

Two series of stable aqueous colloidal solutions of Nd: LaF single-phase well-crystallized nanoparticles (NPs), possessing a fluorcerite structure with different activator concentrations in each series, were synthesized. A hydrothermal method involving microwave-assisted heating (HTMW) in two Berghof speedwave devices equipped with one magnetron (type I) or two magnetrons (type II) was used. The average sizes of NPs are 15. Read More

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October 2021

Uniform Fabrication of Hollow Titania Using Anionic Modified Acrylated Polymer Template for Phase Composition Effect as Photocatalyst and Infrared Reflective Coating.

Nanomaterials (Basel) 2021 Oct 26;11(11). Epub 2021 Oct 26.

School of Nano & Materials Science and Engineering, Kyungpook National University (KNU), Sangju 37224, Korea.

Polymer coatings containing thermal blocking and near-infrared (NIR)-reflective pigments have received much attention for their potential applications in energy-saving fields. A drawback of these coatings is sustainability providing similar long-term performance. Surface cleaning is mandatory to remove contaminants that decrease reflectance. Read More

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October 2021

Functionalized MoS Nanoflowers with Excellent Near-Infrared Photothermal Activities for Scavenging of Antibiotic Resistant Bacteria.

Nanomaterials (Basel) 2021 Oct 25;11(11). Epub 2021 Oct 25.

College of Life Science & Technology, Xinjiang University, Urumqi 830046, China.

Presently, antibiotic resistant bacteria (ARB) have been commonly found in environment, such as air, soil and lakes. Therefore, it is urgent and necessary to prepare antimicrobial agents with excellent anti-antibiotic resistant bacteria. In our research, poly-ethylene glycol functionalized molybdenum disulfide nanoflowers (PEG-MoS NFs) were synthesized via a one-step hydrothermal method. Read More

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October 2021

The Ability of Near Infrared (NIR) Spectroscopy to Predict Functional Properties in Foods: Challenges and Opportunities.

Authors:
Daniel Cozzolino

Molecules 2021 Nov 19;26(22). Epub 2021 Nov 19.

Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation (QAAFI), The University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia.

Near infrared (NIR) spectroscopy is considered one of the main routine analytical methods used by the food industry. This technique is utilised to determine proximate chemical compositions (e.g. Read More

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November 2021

Anharmonicity and Spectra-Structure Correlations in MIR and NIR Spectra of Crystalline Menadione (Vitamin K).

Molecules 2021 Nov 10;26(22). Epub 2021 Nov 10.

Faculty of Chemistry, University of Wrocław, 50-383 Wrocław, Poland.

Mid-infrared (MIR) and near-infrared (NIR) spectra of crystalline menadione (vitamin K) were measured and analyzed with aid of quantum chemical calculations. The calculations were carried out using the harmonic approach for the periodic model of crystal lattice and the anharmonic DVPT2 calculations applied for the single molecule model. The theoretical spectra accurately reconstructed the experimental ones permitting for reliable assignment of the MIR and NIR bands. Read More

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November 2021

Photochemical Stability of a Cotton Fabric Surface Dyed with a Reactive Triphenodioxazine Dye.

Polymers (Basel) 2021 Nov 18;13(22). Epub 2021 Nov 18.

Centre of Advanced Research in Bionanoconjugates and Biopolymers, "Petru Poni" Institute of Macromolecular Chemistry, 700487 Iasi, Romania.

The paper describes the photochemical stability of a commercial triphenodioxazine dye (Reactive Blue_204) linked onto a cotton fabric. Preliminary studies have shown that as a result of irradiation, the dye and its photodegradation products can pass directly onto the skin under conditions that mimic human perspiration and cause side-effects. The cotton dyed fabric was photo irradiated at different time intervals. Read More

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November 2021

Near-Infrared Light-Responsive Shape Memory Polymer Fabricated from Reactive Melt Blending of Semicrystalline Maleated Polyolefin Elastomer and Polyaniline.

Polymers (Basel) 2021 Nov 18;13(22). Epub 2021 Nov 18.

Department of Polymer Engineering, School of Chemical and Materials Engineering, The University of Suwon, Hwaseong 18323, Gyeonggi-do, Korea.

A shape memory polymer was prepared by melt mixing a semicrystalline maleated polyolefin elastomer (mPOE) with a small amount of polyaniline (PANI) (up to 15 wt.%) in an internal mixer. Transmission electron microscopy (TEM), FTIR analysis, DMA, DSC, melt rheological analysis, and a tensile test were performed to characterize the structure and properties of the mPOE/PANI blends. Read More

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November 2021