Development of Multifunctional Folate-Poly(ethylene glycol)-Chitosan-Coated Fe3O4 Nanoparticles for Biomedical Applications

Shuifan Zhou,Zhenqing Hou,Yang Li,Fei Cui,Mengmeng Jia,Xiangrui Yang,Yange Wang,Liya Xie,Qiqing Zhang 한국고분자학회 2014 Macromolecular Research Vol.22 No.1

The efficacy of magnetic nanoparticles (MNPs) for biomedical applications depends on the specic targetingcapacity, blood circulation time and magnetic susceptibility. Functionalized chitosan-coated Fe3O4 nanoparticles(CS-coated Fe3O4 NPs) were synthesized by a non-solvent-aided coacervation procedure followed by a chemicalcrosslinking procedure. The surfaces of CS-coated Fe3O4 NPs were successfully functionalized with folate-poly(ethyleneglycol)-COOH (FA-PEG) to obtain novel FA-PEG-CS-coated Fe3O4 NPs endowed with long blood circulationand specic targeting capacity. The as-synthesized NPs were characterized by dynamic light scattering, transmissionelectron microscope, X-ray diffraction, thermal gravimetric analysis, vibration sample magnetometer, Fourier transforminfrared spectroscopy, and confocal laser scanning microscopy. As a result, the novel FA-PEG-CS-coated Fe3O4 NPsshowed excellent biocompatibility, magnetic properties, good dispersibility, and proper hydrodynamic sizes in an aqueousmedium. The specific targeting capacity of the as-synthesized NPs to cancer cells was also investigated. It wasobserved that the uptake of the FA-PEG-CS-coated Fe3O4 NPs by HeLa cells was significantly enhanced comparedto the CS-coated Fe3O4 NPs and mPEG-CS-coated Fe3O4 NPs. These results clearly indicate that our novel FA-PEGCS-coated Fe3O4 NPs with remarkable specific targeting capacity, long blood circulation, and superparamagnetismhold great promise for biomedical applications, including targeted drug delivery and hyperthermia therapy.

Simulated Annealing Optimization Bat Algorithm in Service Migration Joining the Gauss Perturbation

Zhao Guodong,Zhou Ying,Song Liya 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.12

Bat algorithm is an optimization method inspired by the echo-location bats to search in nature, hunt prey behavior, combining multi-agent system and evolution mechanism. To improve the search results of BA algorithm, this paper proposes a gauss perturbation bats optimization algorithm based on simulated annealing (SAGBA). Firstly, the bionic principle, optimization mechanism and characteristics of the bat algorithm are analyzed and the algorithm optimization process are defined; Then the idea of the simulated annealing is put into bat optimization algorithm, and Gaussian disturbance is carried out to some individuals using the bat algorithm and strengthen the ability of the bat algorithm jumping out of local optimal solution. Finally, conduct simulations are respectively compared in 20 typical benchmark test functions among bat optimization algorithm, simulates annealing particle swarm algorithm and SAGBA algorithm. The results show that SAGBA algorithm not only increases the global convergence, but convergence speed and accuracy are better than other two algorithms.

Knowledge roadmap of sustainable development in the textile and apparel industry: a scientometric analysis

Zhaoshan Wu,Liya Zhou,Xuemei Ding,Xiongying Wu,Laili Wang 한국의류학회 2022 Fashion and Textiles Vol.9 No.1

Practices in the textile and apparel industry (TAI) have led to numerous environmental and social problems, which have prompted extensive research on the sustainable development of the textile and apparel industry (SDTAI). This paper presents a comprehensive and quantitative analysis of the status quo in the SDTAI domain using scientometrics. From 1987 to 2019, the Web of Science core collection databases (SCI and SSCI) included 863 journal articles related to SDTAI, and our analysis results were as follows: (1) 60 critical research keywords occur in the knowledge base; (2) four research hotspots were identifed; (3) fve themes constituted the main knowledge area; and (4) based on the knowledge base, research hotspot, and knowledge domain, the knowledge structure consisted of nine subjects and fve systems. This paper proposes a knowledge roadmap that can be helpful for practitioners and academicians to better understand the current sustainable development status and trends in the TAI.

KGd(MoO4)2:Eu3+ as a promising red phosphor for light-emitting diode application

Linghong Yi,Liya Zhou,Zhengliang Wang,Jianhua Sun,Fuzhong Gong,Weiping Wan,Wei Wang 한국물리학회 2010 Current Applied Physics Vol.10 No.1

A red phosphor KGd(MoO4)2:Eu3+ was prepared by solid-state reaction technique at high temperature. Its photoluminescent property was investigated and the optimum concentration of Eu3+ doped in the KGd(MoO4)2 is 25 mol%. Compared with Y2O2S:0.05Eu3+, the obtained KGd(MoO4)2:Eu3+ shows wider excitation band around 400 nm, higher intensity of Eu3+ 5D0.7F2 emission upon excitation 393 nm, and the CIE chromaticity coordinates (x = 0.655, y = 0.345) are closer to the standard of National Television Standard Committee (NTSC). The optical properties of KGd(MoO4)2:Eu3+ suggest that it is an efficient red-emitting phosphor for light-emitting diode applications.

Synthesis and luminescent properties of Zn0.890Nb2O6:Eu3+0.05, Bi3+0.005, M+0.055(M = Li, Na, K) phosphors

Fuwang Moa,Liya Zhou,Qi Pang,Yuwei Lan,Zhijuan Liang,유재수 한국물리학회 2013 Current Applied Physics Vol.13 No.2

Zn1exNb2O6:Eu3+ x , Zn0.95-yNb2O6:Eu3+ 0:05, Bi3+ y , and Zn0.890Nb2O6:Eu3+ 0:05, Bi3þ 0:005, M+ 0:055 (M ¼ Li, Na, K) redemitting phosphors were synthesized via solegel method. X-ray power diffraction, scanning electron microscopy, photoluminescence excitation, and emission spectra (PL) were used to characterize the phosphors. The obtained Zn1-xNb2O6:Eu3+ x phosphor showed a stronger excitation band near 400 nm. When Eu3+ and Bi3+ were incorporated into the ZnNb2O6 lattice, a broad band from 300 nm to 350 nm with the center at 329 nm appeared. Taking the ion size difference of Liþ (59 pm), Naþ (99 pm), Kv (137 pm), Eu3+ (95 pm), and Zn2+ (60 pm), the emitting intensity of the phosphor increased observably by adding Liþ and Naþ as charge compensators. The PL intensity of the Kþ-doped in Zn0.945Nb2O6:Eu3+ 0:05, Bi3+ 0:005 was slightly less than those of Zn0.945Nb2O6:Eu3þ 0:05, Bi3 þ 0:005. The chromaticity coordinates of Zn0.890Nb2O6:Eu3+ 0:05, Bi3+ 0:005, Li+ 0:055 (x ¼ 0.67, y ¼ 0.34) were close to the standard of National Television Standard Committee values (x ¼ 0.670, y ¼ 0.330). The fabricated light-emitting diode (LED) further confirmed that the Zn0.890Nb2O6:Eu3+ 0:05, Bi3+ 0:005, Liþ 0:055 phosphors can efficiently absorb up to 400 nm irradiation and emit red light, and are potential candidates as red-emitting components for white LED.

ZnO/TiO2 core–shell heterojunction for CdS and PbS quantum dot-cosensitized solar cells

Fangfang Gao,Qian Chen,Xiaoshan Zhang,Huan Wang,Tianjiao Huang,Liya Zhou 한국물리학회 2018 Current Applied Physics Vol.18 No.5

ZnO nanorods (NRs) with regular morphology were prepared through hydrothermal method, and the TiO2 shell was assembled onto the surface of ZnO NRs by spin coating to the ZnO/TiO2 core–shell heterojunction. CdS and PbS quantum dots (QDs) were used to cosensitize the ZnO/TiO2 nanostructure by direct adsorption (DA) and successive ionic layer adsorption and reaction, respectively. SEM, TEM, and HRTEM images show that the samples possessed a rough surface and four lattice fringes indicating the successful synthesis of the ZnO/TiO2/ CdS/PbS composite structure. The ZnO/TiO2(10T)/CdS/PbS sample showed a high absorption intensity at a broad range of wavelength to visible light region. The ZnO/TiO2(10T)/CdS/PbS photoelectrode with QDSSCs showed the highest IPCE of 36.04% and photoelectric efficiency (η) of 1.59%; these values increased by approximately 550% and 150% compared with those of unsensitized ZnO (0.29%) and ZnO/TiO2(10T) (1.04%) and about 146% and 120% compared with those of ZnO/TiO2(10T)/CdS and ZnO/TiO2(10T)/PbS, respectively. The fill factor was 0.36, and the photocurrent density (Jsc) and open circuit voltage (Voc) reached the maximum values of 9.73 mA cm−2 and 0.46 V, respectively.

Reversible Watermarking with Adaptive Embedding Threshold Matrix

( Guangyong Gao ),( Yun-qing Shi ),( Xingming Sun ),( Caixue Zhou ),( Zongmin Cui ),( Liya Xu ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.9

In this paper, a new reversible watermarking algorithm with adaptive embedding threshold matrix is proposed. Firstly, to avoid the overflow and underflow, two flexible thresholds, TL and TR, are applied to preprocess the image histogram with least histogram shift cost. Secondly, for achieving an optimal or near optimal tradeoff between the embedding capacity and imperceptibility, the embedding threshold matrix, composed of the embedding thresholds of all blocks, is determined adaptively by the combination between the composite chaos and the average energy of Integer Wavelet Transform (IWT) block. As a non-liner system with good randomness, the composite chaos is suitable to search the optimal embedding thresholds. Meanwhile, the average energy of IWT block is calculated to adjust the block embedding capacity, and more data are embedded into those IWT blocks with larger average energy. The experimental results demonstrate that compared with the state-of-the-art reversible watermarking schemes, the proposed scheme has better performance for the tradeoff between the embedding capacity and imperceptibility.

One-Pot Synthesis of CdSe Quantum Dots Using Selenium Dioxide as a Selenium Source in Aqueous Solution

Wang, Yilin,Yang, Hong,Xia, Zhenyi,Tong, Zhangfa,Zhou, Liya Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.7

A novel technology has been developed for the synthesis of thioglycolic acid (TGA)-capped CdSe quantum dots (QDs) in aqueous medium. The reaction was carried out in air atmosphere with one-pot by using $SeO_2$ to replace Se or $Na_2Se$. The technological parameters including refluxing time, pH values and molar ratios of selenium to cadmium had significant influence on the luminescence properties of CdSe QDs. Furthermore, the obtained QDs were characterized by fluorescent spectroscopy, X-ray powder diffraction (XRD) and transmission electron microscopy (TEM), respectively. The results demonstrated that the CdSe QDs were of zinc-blended crystal structure in a sphere-like shape.

One-Pot Synthesis of CdSe Quantum Dots Using Selenium Dioxide as a Selenium Source in Aqueous Solution

Yilin Wang,Hong Yang,Zhenyi Xia,Zhangfa Tong,Liya Zhou 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.7

A novel technology has been developed for the synthesis of thioglycolic acid (TGA)-capped CdSe quantum dots (QDs) in aqueous medium. The reaction was carried out in air atmosphere with one-pot by using SeO_2 to replace Se or Na_2Se. The technological parameters including refluxing time, pH values and molar ratios of selenium to cadmium had significant influence on the luminescence properties of CdSe QDs. Furthermore, the obtained QDs were characterized by fluorescent spectroscopy, X-ray powder diffraction (XRD) and transmission electron microscopy (TEM), respectively. The results demonstrated that the CdSe QDs were of zinc-blended crystal structure in a sphere-like shape.