A review: synthesis and applications of graphene/chitosan nanocomposites

Hui Yuan,Long-Yue Meng,Soo-Jin Park 한국탄소학회 2016 Carbon Letters Vol.17 No.-

Recently, with continuous developments in the field of materials science, graphene oxide (GO) has emerged as a promising material with excellent electrical, thermal, mechanical, and optical properties, which play important roles in most fields. Researchers have achieved considerable progress with graphene. Chitosan (CS) is a natural polymer that has been studied intensively owing to its specific formation, high chemical resistance, and excellent physical properties. These outstanding properties have led to its universal use in applications such as textile fabrics, tissue engineering, medicine and health, coatings, and paints. By combining the advantages of GO and CS, different types of promising materials can be obtained. This review discusses the preparation of GO-CS fibers, hydrogel and aerogel, and the applications of GO-CS nanocomposites. In addition, directions for future research on graphene material composites are discussed.

Effect of the SBA-15 template and KOH activation method on CO2 adsorption by N-doped polypyrrole-based porous carbons

Hui Yuan,Biao Jin,Long-Yue Meng 한국탄소학회 2018 Carbon Letters Vol.28 No.-

Nitrogen-doped carbons have attracted much attention due to their novel application in relation to gas storage. In this study, nitrogen-doped porous carbons were synthesized using SBA-15 as a template, polypyrrole as the carbon and nitrogen precursor, and KOH as an activating agent. The effect of the activation temperature (600–850°C) on the CO2 adsorption capacity of the obtained porous carbons was studied. Characterization of the resulting carbons showed that they were micro-/meso-porous carbon materials with a well-developed pore structure that varied with the activation temperature. The highest surface area of 1488 m2 g–1 was achieved at an activation temperature of 800°C (AC-800). The nitrogen content of the activated carbon decreased from 4.74 to 1.39 wt% with an increase in the activation temperature from 600 to 850°C. This shows that nitrogen is oxidized and more easily removed than carbon during the activation process, which indicates that C-N bonds are more easily ruptured at higher temperatures. Furthermore, CO2 adsorption isotherms showed that AC-800 exhibited the best CO2 adsorption capacity of 110 mg g–1 at 298 K and 1 bar.

KOH-activated graphite nanofibers as CO2 adsorbents

Hui Yuan,Long-Yue Meng,Soo-Jin Park 한국탄소학회 2016 Carbon Letters Vol.19 No.-

Porous carbons have attracted much attention for their novel application in gas storage. In this study, porous graphite nano-fiber (PGNFs)-based graphite nano fibers (GNFs) were prepared by KOH activation to act as adsorbents. The GNFs were activated with KOH by changing the GNF/KOH weight ratio from 0 through 5 at 900°C. The effects of the GNF/ KOH weight ratios on the pore structures were also addressed with scanning electron microscope and N2 adsorption/desorption measurements. We found that the activated GNFs exhibited a gradual increase of CO2 adsorption capacity at CK-3 and then decreased to CK-5, as determined by CO2 adsorption isotherms. CK-3 had the narrowest micropore size distribution (0.6–0.78 nm) among the treated GNFs. Therefore, KOH activation was not only a significant method for developing a suitable pore-size distribution for gas adsorption, but also increased CO2 adsorption capacity as well. The study indicated that the sample prepared with a weight ratio of ‘3’ showed the best CO2 adsorption capacity (70.8 mg/g) as determined by CO2 adsorption isotherms at 298 K and 1 bar.

A facile method to synthesize magnetic nanoparticles chelated with Copper(II) for selective adsorption of bovine hemoglobin

Huiyuan Guan,Jundong Wang,Siyuan Tan,Qiang Han,Qionglin Liang,Mingyu Ding 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.6

A novel and uncomplicated synthesis method of Cu2+-chelating with carboxyl groups that directly-modified NiFe2O4 magnetic microspheres (NiFe2O4-PAA-Cu2+) was fabricated for selective enrichment and separation of bovine hemoglobin (BHb). First, a carboxyl group directly-modified on NiFe2O4 magnetic microspheres was gained through a facile one-pot solvothermal method. Second, Cu2+ from CuSO4 was brought into use to react with carboxyl groups under mechanical stirring at room temperature. The resulting magnetic microspheres were characterized by distinct instruments that included transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), vibrating sample magnetometer (VSM) and scanning electron microscope (SEM) to examine the size, morphology, composition and magnetization characterization. The results indicated that the NiFe2O4-PAA-Cu2+ microspheres exhibited good saturation magnetization (36.686 emu g1), which can facilitate magnetic separation under the help of an outside magnetic field. Also, good dispersion and high adsorption ability to BHb (783.53mg g1) can be applied to selective enrichment for bovine hemoglobin and used for selective sorption of BHb protein in bovine blood samples.

중국 이족(彝族) 여성 두식(頭飾)의 형성요인과 특징에 관한 연구

왕혜원(Huiyuan Wang),소황옥(Hwangoak Soh) 한국복식학회 2017 服飾 Vol.67 No.3

A techno-economic sizing method for PV/battery/grid hybrid solar systems for residential buildings

Yuxin Zheng,Huiyuan Shen,Jie Li 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.11

The increasing share of the distributed renewable energy in power generation is an important development direction in the electrical power system. However, its intermittent and nonprogrammable nature is a major challenge. Battery storage is providing an effective solution to solve these issues. In the paper, the PV/battery/grid (PVBG) system is established for residential buildings, and the optimal combination of PV size and battery size was obtained by techno-economic analysis. Firstly, self-sufficiency ratio (SSR) and self-consumption ratio (SCR) as the technical indicators were applied to evaluate and analyze the performance of different PV/battery/grid systems. Secondly, the levelized cost of energy (LCOE) as an important economic indicator was applied to optimize PVBG system configuration by using the particle swarm optimization (PSO) technique. PVBG systems were simulated under the actual electricity price and feed-in-tariff of a typical power market. Lastly, the optimal PV and battery system combination was obtained by maximizing SCR and SSR and minimizing LCOE. The results showed that integrating battery energy storage can improve SCR and SSR. The PVBG systems with a higher SSR resulted in more PV production to sell back to the grid and reduced the usage rate of the battery. Eight cases with different technical indicators were compared and discussed. The results showed that the LCOE of the PVBG system ranged from 0.351 to 0.769 RMB/kWh for the residential building studied. According to the technical and economic indicators, the optimal sizes of PV and battery were respectively determined to be 6696 Wp and 2366 Wh for the case studied.

Cell-Penetrating Peptide-Modified PLGA Nanoparticles for Enhanced Nose-to-Brain Macromolecular Delivery

Lu Yan,Huiyuan Wang,Yifan Jiang,Jinhua Liu,Zhao Wang,Yongxin Yang,Shengwu Huang,Yongzhuo Huang 한국고분자학회 2013 Macromolecular Research Vol.21 No.4

Macromolecular drugs become an essential part in neuroprotective treatment. However, the nature of ineffective delivery crossing the blood brain barrier (BBB) renders those macromolecules undruggable for clinical practice. Recently, brain target via intranasal delivery have provided a promising solution to circumventing the BBB. Despite the direct route from nose to brain (i.e. olfactory pathway), there still are big challenges for large compounds like proteins to overcome the multiple delivery barriers such as nasal mucosa penetration, intracellular transport along the olfactory neuron, and diffusion across the heterogeneous brain compartments. Herein presented is an intranasal strategy mediated by cell-penetrating peptide modified poly(lactic-co-glycolic acid) (PLGA) nanoparticles for the delivery of insulin to the brain, a potent therapeutic against Alzheimer’s disease. The results revealed that the cell-penetrating peptide can potentially deliver insulin into brain via the nasal route, showing a total brain delivery efficiency of 6%. It could serve as a potential treatment for neurodegenerative diseases.

The Last Shepherd

( Mayunfei ),( Liu Huiyuan ) 한국무용연구학회 2021 한국무용연구회 국제학술발표논문집 Vol.2021 No.-

Transcriptome Profile Analysis of Cadmium Tolerance in Chinese Flowering Cabbage

Jiewei Wang,Huiyuan Li,Dandan Zou,Jinfeng Zhao,Lianxue Fan,Tao Wu 한국원예학회 2017 Horticulture, Environment, and Biotechnology Vol.58 No.1

Chinese flowering cabbage (Brassica parachinensis L.) is an important leafy vegetable crop that can accumulatehigh levels of cadmium (Cd) and can thus be easily contaminated by this heavy metal. In this study, we performedgenome-wide transcriptional profiling of Cd tolerance in Cd-tolerant cultivar ‘LB70’ using Solexa sequencing to identifygenes and pathways involved in Cd tolerance in Chinese flowering cabbage. Profiling analysis revealed numerous changesin gene expression in response to Cd treatment, including 1669 genes that were downregulated and 1404 genes that wereupregulated. Gene ontology analysis showed that these differentially expressed genes were mainly involved in binding,catalytic processes, metabolism, cellular processes, single-organism processes, biological regulation, localization, andstimulus responses. Several known important Cd tolerance-related genes, such as HMA3, HMA4, and Nramp1, werealso identified. Pathway analysis suggested that two potential novel pathways, namely, the viral carcinogenesis andParkinson’s disease pathways, might be involved in Cd tolerance in Chinese flowering cabbage. The genes andpathways identified in this study provide an important basis for future studies on the molecular mechanism of Cdtolerance in Chinese flowering cabbage.

Dynamics of Bacterial Communities of Lamb Meat Packaged in Air and Vacuum Pouch during Chilled Storage

Taojun Wang,Huiyuan Guo,Hao Zhang,Fazheng Ren,Ming Zhang,Shaoyang Ge,Hailing Luo,Liang Zhao 한국축산식품학회 2019 한국축산식품학회지 Vol.39 No.2

In this study, the changes in microbial communities of lamb meat packaged in the air (plastic tray, PT) and in a vacuum pouch (VAC) were assessed by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE) during the storage at 4°C. For the PT lamb, the total viable count (TVC) was 107 CFU/g on Day 5, and the dominated bacteria were Pseudomonas fragi, P. fluorescens, and Acinetobacter spp. For the VAC lamb, the TVC was 107 CFU/g on Day 9, and the dominated bacteria were lactic acid bacteria, including Carnobacterium divergens, C. maltaromaticum, and Lactococcus piscium. One strain of Pseudomonas spp. also appeared in VAC lamb. The relative abundance of Enterobacteriaceae in VAC lamb was higher than that PT lamb, indicating a more important role of Enterobacteriaceae in spoilage for VAC lamb than that of PT lamb. The microbial compositions changed faster in the lamb stored in a PT than that stored in a VAC, and microbial community compositions of the late storage period were largely different from those of the early storage period for both the conditions. The findings of this study may guide improve the lamb hygiene and prolong the shelf life of the lamb.