Danyang Zhang

Europium

Bipyridine

10.1016/j.dyepig.2021.109879

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Citations (30)

High-Yield, Stable, and Ultrasensitive Carbon Dots for pH Sensing and Fe²⁺ Detection Are Synthesized at Room Temperature

The Journal of Physical Chemistry C (2023)

Chunyu Yu Xue Li Xin Qiao Zhi‐wei Zhang Danyang Zhang

Fluorescent carbon quantum dots (r-CDs) were synthesized safely and readily by stirring at room temperature with a yield of 76.5%. The synthesized r-CDs exhibit bright green emission with an absolute quantum yield of 12.0% under the excitation of ultraviolet light. Within the pH range of 3–12, the r-CDs exhibit excellent fluorescence stability. Interestingly, the fluorescence intensity of r-CDs faded promptly when the pH value diminished to 2 and then regained when the pH value returned to 3. This means that r-CDs can be used as "on–off–on" fluorescent probes for pH sensing. The mechanism of this sensitive pH response behavior was discussed in detail, and a possible mechanism of protonation–deprotonation–protonation processes was proposed. In addition, we have proposed a green preparation route for eco-friendly filter paper using anticounterfeiting. Interestingly, the presence of Fe2+ significantly quenched the fluorescence of r-CDs. Experimental results demonstrated the r-CDs can also be used to detect the content of Fe2+ in water, and the detection limit was 8.82 μM/L.

Quantum yield

Carbon fibers

Ultraviolet

Filter paper

10.1021/acs.jpcc.2c06449

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Citations (7)

Size Effects on Fracture Parameters of High Alumina Refractories

Figshare (2018)

Wenjie Yuan Hai Tang Qingyou Zhu Danyang Zhang

The randomness of phase compositions and their distribution as well as the micro cracks and pores in refractories result in the dependence of mechanical properties on the sample size. In this work, the size effects on fracture parameters including bending strength, elastic modulus and fracture toughness of high alumina bricks were investigated by testing samples of different sizes according to the national standard in China. The results showed that the smaller samples presented higher strength, while the larger samples possessed greater elastic modulus. Weibull modulus m of bending strength for high alumina bricks calculated for samples of two sizes, each group featured 32 samples, ranged from 11 to 12, which was higher than in other refractories such as low grade high alumina, magnesia-carbon and magnesia-chrome bricks. The scatter of the average strength and its standard deviation became stable when the sample number was more than 20. The fractal dimension of fracture surface for high alumina bricks was inversely and directly proportional to the sample size and the fracture toughness, respectively. The estimated fracture toughness of high alumina bricks was close to window glass and less than alumina and mullite.

10.6084/m9.figshare.6802457

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Citations (0)

CCDC 978727: Experimental Crystal Structure Determination

The Cambridge Structural Database (2014)

Xiao-Ke Yu Sheng‐Liang Ni Danyang Zhang Yue–Qing Zheng Hong–Lin Zhu

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cc11vfv5

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Citations (0)

CCDC 2007658: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

Xinyue Chen Danyang Zhang Dan Xu Huan Zhou Gong Xu

10.5517/ccdc.csd.cc25d45x

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Enhanced energy storage performance of Bi(Mg0.5Hf0.5)O3 modified K0.5Na0.5NbO3 relaxor ferroelectric ceramics via synergistic strategy

Ceramics International (2024)

Jingjing Tian Danyang Zhang Shuo Tian Xuanhai Zhang Heng Tian

Ferroelectric ceramics

Relaxor ferroelectric

10.1016/j.ceramint.2024.09.027

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Citations (1)

Size Effects on Fracture Parameters of High Alumina Refractories

Materials Research (2018)

Wenjie Yuan Hai Tang Qingyou Zhu Danyang Zhang

The randomness of phase compositions and their distribution as well as the micro cracks and pores in refractories result in the dependence of mechanical properties on the sample size. In this work, the size effects on fracture parameters including bending strength, elastic modulus and fracture toughness of high alumina bricks were investigated by testing samples of different sizes according to the national standard in China. The results showed that the smaller samples presented higher strength, while the larger samples possessed greater elastic modulus. Weibull modulus m of bending strength for high alumina bricks calculated for samples of two sizes, each group featured 32 samples, ranged from 11 to 12, which was higher than in other refractories such as low grade high alumina, magnesia-carbon and magnesia-chrome bricks. The scatter of the average strength and its standard deviation became stable when the sample number was more than 20. The fractal dimension of fracture surface for high alumina bricks was inversely and directly proportional to the sample size and the fracture toughness, respectively. The estimated fracture toughness of high alumina bricks was close to window glass and less than alumina and mullite.

Mullite

Weibull modulus

10.1590/1980-5373-mr-2018-0091

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Citations (4)

CCDC 978726: Experimental Crystal Structure Determination

The Cambridge Structural Database (2014)

Xiao-Ke Yu Sheng‐Liang Ni Danyang Zhang Yue–Qing Zheng Hong–Lin Zhu

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/cc11vft4

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Citations (0)

CCDC 1936101: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

Xiaoxia Wang Danyang Zhang Peng‐Yu Zhuang Yao Zhang Jiale Xu

10.5517/ccdc.csd.cc22znwm

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One-pot synthesis of multicolor carbon quantum dots: One as pH sensor, one with ultra-narrow emission as fluorescent sensor for uric acid

Dyes and Pigments (2023)