scholarly journals MoS2 QDs/8-Armed Poly(Ethylene Glycol) Fluorescence Sensor for Three Nitrotoluenes (TNT) Detection

Biosensors ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 475
Author(s):  
Xiaoyuan Zhang ◽  
Zhiqiang Su
Keyword(s):  
Quantum Dots ◽  
Polyethylene Glycol ◽  
Detection Limit ◽  
Ethylene Glycol ◽  
Hydrazine Hydrate ◽  
Poly Ethylene Glycol ◽  
Fluorescent Properties ◽  
Detection Range ◽  
Poly Ethylene ◽  
Tnt Detection

In this work, ammonia cross-linked 8-armed polyethylene glycol hydrogel material was successfully synthesized and used as a template for synthesizing nanoparticles with fluorescent properties. The 8-armed polyethylene glycol hydrogel template was used to prepare molybdenum disulfide quantum dots (MoS2 QDs). The ammonium tetrathiomolybdate functioned as a molybdenum source and hydrazine hydrate functioned as a reducing agent. The fluorescence properties of the as-prepared MoS2 QDs were investigated. The bursting of fluorescence caused by adding different concentrations of explosive TNT was studied. The study indicated that the synthesized MoS2 QDs can be used for trace TNT detection with a detection limit of 6 nmol/L and a detection range of 16–700 nmol/L. Furthermore, it indicated that the fluorescence-bursting mechanism is static bursting.

scholarly journals One-Pot, In-Situ Synthesis of 8-Armed Poly(Ethylene Glycol)-Coated Ag Nanoclusters as a Fluorescent Sensor for Selective Detection of Cu2+

Biosensors ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 131 ◽  
Author(s):  
Xiaoyuan Zhang ◽  
Guanghua Zhang ◽  
Gang Wei ◽  
Zhiqiang Su
Keyword(s):  
Quantum Dots ◽  
Ethylene Glycol ◽  
Fluorescent Sensor ◽  
In Situ Synthesis ◽  
Selective Detection ◽  
Poly Ethylene Glycol ◽  
One Pot ◽  
Detection Range ◽  
Poly Ethylene

Fluorescent nanomaterials, such as quantum dots, have developed rapidly in recent years and have been significantly developed. Herein, we demonstrate a facile, one-pot, and in-situ synthesis strategy to obtain fluorescent silver nanoclusters (AgNCs) coated with eight-armed poly (ethylene glycol) polymers (8PEG-AgNCs) via a direct gel-mediated process. During the synthesis, ammonium (NH3) served as the crosslinker for the gel formation via a amine-type Michael addition reaction. This hydrogel can be used as a template to synthesize AgNCs using its volume-limiting effect. The in-situ generation of AgNCs takes place inside the nanocages of the formed gels, which guarantees the homogenous distribution of AgNCs in the gel matrix, as well as the efficient coating of PEG on the nanoclusters. After the degradation of gels, the released 8PEG-AgNCs nanohybrids showed strong blue fluorescence and exhibited long-term stability in aqueous solution for nearly one year. Results showed that the fabricated sensor revealed excellent fluorescent sensitivity for the selective detection of Cu2+ with a detection limit of 50 nM and a wide linear detection range of 5–100 μM. It is proposed that the greater cross-linking density leads to smaller gel pores and allows the synthesis of AgNCs with fluorescent properties. These results indicate that this novel hydrogel with certain biodegradation has the potential to be applied as a fluorescent sensor for catalytic synthesis, fluorescence tracing in cells, and fluorescence detection fields. Meanwhile, the novel design principle has a certain versatility to accelerate the development and application of other kinds of metal nanoclusters and quantum dots.

A smart drug-delivery nanosystem based on carboxylated graphene quantum dots for tumor-targeted chemotherapy

Nanomedicine ◽  
2019 ◽  
Vol 14 (15) ◽  
pp. 2011-2025 ◽  
Author(s):  
Zhen Li ◽  
Jialong Fan ◽  
Chunyi Tong ◽  
Hongyan Zhou ◽  
Wenmiao Wang ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Quantum Dots ◽  
Folic Acid ◽  
Ethylene Glycol ◽  
Drug Delivery System ◽  
Delivery System ◽  
Graphene Quantum Dots ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

Aim: Constructing a new drug-delivery system using carboxylated graphene quantum dots (cGQDs) for tumor chemotherapy in vivo. Materials & methods: A drug-delivery system was synthesized through a crosslink reaction of cGQDs, NH2-poly(ethylene glycol)-NH2 and folic acid. Results: A drug delivery system of folic acid-poly(ethylene glycol)-cGQDs was successfully constructed with ideal entrapment efficiency (97.5%) and drug-loading capacity (40.1%). Cell image indicated that the nanosystem entered into human cervical cancer cells mainly through macropinocytosis-dependent pathway. In vivo experiments showed the outstanding antitumor ability and low systemic toxicity of this nanodrug-delivery system. Conclusion: The newly developed drug-delivery system provides an important alternative for tumor therapy without causing systemic adverse effects.

Hybridizing polymer electrolyte with poly(ethylene glycol) grafted polymer-like quantum dots for all-solid-state lithium batteries

2021 ◽  
Vol 618 ◽  
pp. 118702 ◽  
Author(s):  
Weijie Kou ◽  
Ruixin Lv ◽  
Shengwu Zuo ◽  
Zhihao Yang ◽  
Jiajia Huang ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Ethylene Glycol ◽  
Polymer Electrolyte ◽  
Lithium Batteries ◽  
Poly Ethylene Glycol ◽  
Grafted Polymer ◽  
Poly Ethylene

Reappearance of slow mode in mixtures of polyethylene glycol and poly(sodium methacrylate)

Soft Matter ◽  
2018 ◽  
Vol 14 (24) ◽  
pp. 5039-5047
Author(s):  
Ksenija Kogej ◽  
Jaka Štirn ◽  
Jurij Reščič
Keyword(s):  
Polyethylene Glycol ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Ethylene Glycol ◽  
Slow Mode ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene ◽  
Scattering Signal ◽  
Sodium Methacrylate

After addition of poly(ethylene glycol) to a solution of poly(sodium methacrylate), the slow-mode dynamic light scattering signal reappears.

Effect of Poly(ethylene glycol) Length on the in Vivo Behavior of Coated Quantum Dots

Langmuir ◽  
2009 ◽  
Vol 25 (5) ◽  
pp. 3040-3044 ◽  
Author(s):  
T. Jean Daou ◽  
Liang Li ◽  
Peter Reiss ◽  
Véronique Josserand ◽  
Isabelle Texier
Keyword(s):  
Quantum Dots ◽  
Ethylene Glycol ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene

Alternative polymer precipitants for protein crystallization

2010 ◽  
Vol 43 (4) ◽  
pp. 737-742 ◽  
Author(s):  
Tereza Skálová ◽  
Jarmila Dušková ◽  
Jindřich Hašek ◽  
Petr Kolenko ◽  
Andrea Štěpánková ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Ethylene Glycol ◽  
Protein Crystallization ◽  
Glycol Adipate ◽  
Poly Ethylene Glycol ◽  
Ph Values ◽  
Ethylene Glycol Adipate ◽  
Acid Sodium Salt ◽  
Poly Ethylene ◽  
Glycol Methyl Ether

A set of 16 inexpensive and commercially available polymer precipitants were tested for protein crystallization. Eight of them were found suitable: polyethylene glycol dimethyl ether of molecular weight (MW) 500, 1000 and 2000; di[poly(ethylene glycol)] adipate, MW 900; poly(ethylene glycol-ran-propylene glycol), MW 2500 and 12000; poly(acrylic acid) sodium salt, MW 2100; and polyethylene glycol methyl ether methacrylate, MW 1100. Two new crystallization screens, PolyA and PolyB, were formulated using these eight polymers, each containing 96 solutions – four polymers in combination with 24 common salts and buffers, covering pH values from 4.5 to 9.0. The screens were tested on 29 proteins, 21 of which were crystallized. The tests confirmed the applicability of the eight polymers as precipitants for protein crystallization.

Synthesis and fluorescent properties of a novel europium(III) complex with terpyridine-capped poly(ethylene glycol)

2012 ◽  
Vol 30 (7) ◽  
pp. 705-708 ◽  
Author(s):  
Hongxing ZHANG ◽  
Xiufu HUA ◽  
Xinlin TUO ◽  
Xiaogong WANG
Keyword(s):  
Ethylene Glycol ◽  
Poly Ethylene Glycol ◽  
Fluorescent Properties ◽  
Poly Ethylene

Preparation and Characterization of CdSe/ZnS Quantum Dots Encapsulated in Poly(ethylene glycol)-b-Poly(D,L-lactide) Micelle Nanoparticles

2010 ◽  
Vol 10 (1) ◽  
pp. 487-496 ◽  
Author(s):  
Joohyeon Lee ◽  
Jeong Hyuk Im ◽  
Kang Moo Huh ◽  
Yong-kyu Lee ◽  
Heungsoo Shin
Keyword(s):  
Quantum Dots ◽  
Ethylene Glycol ◽  
Poly Ethylene Glycol ◽  
Poly Ethylene
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