Preparation and characterization of blue-emitting carbon quantum dots and their silicone rubber composites

Li, Jianping; Guo, Huiming; Wei, Anqi; Jiang, Jingzhe; Ji, Yonghoon; Qiang, Huijun; Jiang, Yan; Zhang, Hongwen; Liu, Hongbo

doi:10.1088/2053-1591/aafa42

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…Such excitation-dependent PL behaviors are attributed to the presence of impurity states in CDs which affected the bandgap of CDs. 22,23 The degree and type of functionalization in CDs leads to different emissive surface states or energy traps. From the FTIR spectra, CDs-CA possess numerous and complex oxygen-containing functional groups, which leads to complex surface states and further leads to complex excitation-dependent behaviors.…”

Section: Resultsmentioning

confidence: 99%

The Influence of Functional Group on Photoluminescence Properties of Carbon Dots

Liu

et al. 2019

ECS J. Solid State Sci. Technol.

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Two types of carbon dots (CDs) with different surface functional groups were prepared by using citric acid (CA) and glucose as carbon sources, which were named as CDs-CA and CDs-Glu. The differences of excitation wavelength dependent photoluminescence (PL) behavior and pH sensitivity were studied, which is caused by the differences of structure between CDs-CA and CDs-Glu. Detailed material characterization reveals that CDs-CA possesses higher PL intensity due to their rich surface functional groups (especially -NH2 with passivation effect). The variation trend of emission peak position to excitation wavelength for CDs-CA is also different from that for CDs-Glu. Emission peak position of maximum PL intensity of CDs-Glu is red-shifted compared to CDs-CA, which is ascribed to the higher graphitization degree. Besides, CDs-CA has higher pH sensitivity due to their more abundant functional groups on its surface. It is of great significance to understand the fluorescence mechanism of CDs.

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Section: Resultsmentioning

confidence: 99%

The Influence of Functional Group on Photoluminescence Properties of Carbon Dots

Liu

et al. 2019

ECS J. Solid State Sci. Technol.

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“…The quantum yield of produced CQDs was 28.3%, and the generated CQDs’s sizes were in the range of 2–4 nm, and they showed excellent dispersion and low crystallinity [ 191 ]. Li and coworkers [ 192 ] used starch soluble as a molecular precursor to synthesize blue-emitting CQDs by an ultrasonic technique. In the next step, the obtained CQDs were functionalized with γ -methacryloxy propyl trimethoxyl silane, and then were mixed with silicon rubber to make CQDs-silicon rubber composite [ 192 ].…”

Section: Carbon-based Nanostructuresmentioning

confidence: 99%

“…Li and coworkers [ 192 ] used starch soluble as a molecular precursor to synthesize blue-emitting CQDs by an ultrasonic technique. In the next step, the obtained CQDs were functionalized with γ -methacryloxy propyl trimethoxyl silane, and then were mixed with silicon rubber to make CQDs-silicon rubber composite [ 192 ]. The size distribution of the original product was in the range 1–4 nm, and it displayed a remarkable transparency and excellent thermal stability [ 192 ].…”

Section: Carbon-based Nanostructuresmentioning

confidence: 99%

“…In the next step, the obtained CQDs were functionalized with γ -methacryloxy propyl trimethoxyl silane, and then were mixed with silicon rubber to make CQDs-silicon rubber composite [ 192 ]. The size distribution of the original product was in the range 1–4 nm, and it displayed a remarkable transparency and excellent thermal stability [ 192 ]. Xu et al [ 193 ] made nitrogen-doped multicolor CDs from kiwifruit juice via ultrasonic technique by including various additives such as acetone, ethanol, and ethylenediamine.…”

Section: Carbon-based Nanostructuresmentioning

confidence: 99%

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Carbon-Based Nanostructures as Emerging Materials for Gene Delivery Applications

Yazdani,

Mozaffarian,

Pazuki

et al. 2024

Pharmaceutics

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Gene therapeutics are promising for treating diseases at the genetic level, with some already validated for clinical use. Recently, nanostructures have emerged for the targeted delivery of genetic material. Nanomaterials, exhibiting advantageous properties such as a high surface-to-volume ratio, biocompatibility, facile functionalization, substantial loading capacity, and tunable physicochemical characteristics, are recognized as non-viral vectors in gene therapy applications. Despite progress, current non-viral vectors exhibit notably low gene delivery efficiency. Progress in nanotechnology is essential to overcome extracellular and intracellular barriers in gene delivery. Specific nanostructures such as carbon nanotubes (CNTs), carbon quantum dots (CQDs), nanodiamonds (NDs), and similar carbon-based structures can accommodate diverse genetic materials such as plasmid DNA (pDNA), messenger RNA (mRNA), small interference RNA (siRNA), micro RNA (miRNA), and antisense oligonucleotides (AONs). To address challenges such as high toxicity and low transfection efficiency, advancements in the features of carbon-based nanostructures (CBNs) are imperative. This overview delves into three types of CBNs employed as vectors in drug/gene delivery systems, encompassing their synthesis methods, properties, and biomedical applications. Ultimately, we present insights into the opportunities and challenges within the captivating realm of gene delivery using CBNs.

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“…In turn, a low-permeability, dense filter cake is formed to reduce the filtration loss. , At present, the commonly used fluid loss agents mainly include starch, cellulose, sulfonated resin, synthetic polymers, and so on . Due to the existence of a large number of ether oxygen bonds in the molecular structure of natural polymers, they have poor temperature resistance and are prone to biodegradation, which seriously limits their application in high-temperature drilling fluids. , Synthetic polymers as filtrate reducers are the main research direction at present. Alain Pierre Tchameni et al used free radical copolymerization technology to synthesize a new amphoteric quaternary polymer, namely, AB-47 with N , N -dimethylacrylamide (DMAM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), dimethyldiallylammonium chloride (DMDAAC), and N -vinylpyrrolidone (NVP) monomers.…”

Section: Introductionmentioning

confidence: 99%

Acrylamide-Based Polymer/Laponite Composite as a Filtration Reducer in Water-Based Drilling Fluids

Lin,

Li,

et al. 2024

Energy Fuels

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With deep and ultra-deep drilling engineering, silane coupling agent KH-570 was used to modify the surface of nanolaponite, and acrylamide (AM), 2-acrylamido-2-methylpropanesulfonic acid (AMPS), N-vinylpyrrolidone (NVP), and dimethyldiallylammonium chloride (DMDAAC) were selected as monomers. A new fluid loss agent, YH-1, was synthesized by aqueous solution polymerization, and the copolymer was characterized by infrared spectroscopy, nuclear magnetic resonance hydrogen spectroscopy, TEM, molecular weight analysis, and thermal stability analysis. The results show that the synthesized product is consistent with the molecular structure design goal. The modified nanolaponite was successfully introduced and relatively uniformly distributed in the filtrate reducer, and the molecular weight distribution was wide. After hot rolling at 240 °C for 16 h, it can still maintain good apparent viscosity, plastic viscosity, and dynamic plastic ratio. When the addition amount is 1.5 wt %, the apparent viscosity can still be maintained at 40 mPa•s, and its high-temperature and high-pressure (HTHP) filtration loss is the lowest compared with the domestic and foreign commercial filter loss reducers. Through particle size distribution, scanning electron microscopy, and zeta potential analysis, the surface of the filter cake formed after adding YH-1 was smooth and shiny, and the hydration film of bentonite particles was thicker. The adsorption group is adsorbed on the surface of bentonite particles, and the hydration group ionizes a large number of negatively charged groups, which increases the thickness of the hydration film of the bentonite particles and the potential of the bentonite particles. The addition of nanolaponite enhances the plugging effect of mud cake, improves the impermeability of mud cake, and enhances the filtration performance.

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Preparation and characterization of blue-emitting carbon quantum dots and their silicone rubber composites

Cited by 8 publications

References 23 publications

The Influence of Functional Group on Photoluminescence Properties of Carbon Dots

The Influence of Functional Group on Photoluminescence Properties of Carbon Dots

Carbon-Based Nanostructures as Emerging Materials for Gene Delivery Applications

Acrylamide-Based Polymer/Laponite Composite as a Filtration Reducer in Water-Based Drilling Fluids

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