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Colloidal Synthesis of Silicon Nanoparticles for Hyperpolarization Nuclear Magnetic Resonance
( Luu Son Quy ),정지혜,이영복 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Silicon nanoparticles (Si NPs) has developed for application in medicine because of their biocompatibility, biodegradability, drug loading and imaging agents. Herein, we report a solution synthesis of Si NPs as hyperpolarized magnetic resonance imaging. The Si NPs was synthesized by the reduction of silicon tetrachloride using organic reductants at low temperature. This nanoparticles size was controlled by investigation ratio of silicon precursor to reductant, temperature. The chloride-terminated Si NPs was converted to silanization-terminated through methoxy-capped. The morphology, structure and physical properties of Si NPs were confirmed by transmission electron microscopy (TEM), X-ray diffraction (XRD), infrared spectroscopy (IR spectroscopy) and dynamic light scattering (DLS). This research recommends that controlling the size of silicon nanoparticles via colloidal synthesis as the contrast agents for hyperpolarized 29Si magnetic resonance imaging.
Quy Son Luu,Uyen Thi Do,Dokyung Kim,Jiwon Kim,Donghyeok Jo,Quynh Thi Nguyen,Youngbok Lee 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.105 No.-
This study introduces a facile method for synthesizing covalently bonded magnetic carbon nanoparticles(MCNs) in which carboxylic acid-functionalized activated carbon nanospheres (ACN-COOH) are connectedwith amine-terminated iron oxide nanoparticles (NPs) (Fe3O4-NH2) via a carbodiimide crosslinkingreaction. The adsorption characteristics of the developed magnetic nanoparticles (ACN-Fe3O4) wereinvestigated using a standard cationic dye (methylene blue, MB). Two additional MCNs (multi-coreand core@shell structures) were also prepared, and their adsorption performances were extensively compared. The developed ACN-Fe3O4 material thoroughly utilizes the strengths of activated carbon and Fe3O4themselves, exhibiting large specific surface areas (708.4 m2/g) and strong magnetic properties(40.3 emu/g), resulting in high adsorption capacity (349.5 mg/g) and recycling efficiency (76 % of adsorptionperformance after four cycles). In addition, a study of the mechanism reveals that pore-filling processesare dominant with minor contributions from electrostatic interactions, p–p interactions, and n–p interactions. The developed covalently bonded magnetic carbon nanoparticles (ACN-Fe3O4) can thusbe considered as competent adsorbents with the potential to compensate for the drawbacks of contemporaryMCNs, such as, low adsorption capacity, and weak magnetic properties.
정지혜,( Luu Son Quy ),이영복 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Water pollution from wastewater has a lot of problems all over the world. To solve water pollution, activated carbon, silica and zeolite are used as adsorbents. Among them, powder activated carbon has large surface area, so it is highly efficient to process. Thus, in this research, three different morphology of Magnetic Carbon Nanosphere powder activated carbon were synthesized to effectively treat contaminants and the adsorption efficiency was compared. (1) It has a form in which various spherical Fe is contained in Carbon NanoSphere (CNS). (2) It is a form containing one spherical Fe<sub>3</sub>O<sub>4</sub> in CNS. (3) CNS and Fe<sub>3</sub>O<sub>4</sub> are connected to APTES. These three models were measured by UV, SEM and XRD. In addition, titanium dioxide, which has excellent photocatalytic effect, was attached to the CNS to compare the efficiency of wastewater treatment. These synthesized adsorbents will help people suffering from water pollution by purifying the water by adsorbing organic contaminants in the wastewater.
Xuan Quy Luu,Kyeongmin Lee,Jae Kwan Jun,Mina Suh,Kui Son Choi 한국역학회 2023 Epidemiology and Health Vol.45 No.-
OBJECTIVES: This study aimed to investigate socioeconomic status (SES)-based inequality in colorectal cancer (CRC) screening in Korea. We assessed whether the rates of opportunistic and organized CRC screening differed according to income and education levels. METHODS: We analyzed data from the Korean National Cancer Screening Survey of 27,654 cancer-free individuals, aged 50-74 years, from 2009 to 2021. The weighted cancer screening rates with trends were estimated with the average annual percentage change using joinpoint regression. Inequality was calculated in both relative and absolute terms, based on a Poisson regression model. RESULTS: The organized screening rate increased significantly from 22.1% in 2009 to 53.1% in 2020 and 50.6% in 2021, with an average annual change of 8.6% (95% confidence interval [CI], 4.9 to 12.5). In contrast, no significant trend was observed for opportunistic screening. The SES inequality in opportunistic screening uptake was indicated by a slope index of inequality (SII) of 9.74% (95% CI, 6.36 to 13.12), relative index of inequality (RII) of 2.18 (95% CI, 1.75 to 2.70) in terms of education level; and an SII of 7.03% (95% CI, 4.09 to 9.98), RII of 1.81 (95% CI, 1.41 to 2.31) in terms of measured income. Although there was an increasing trend in income inequality, no significant SES inequalities were observed in the overall estimates for organized screening. CONCLUSIONS: Organized CRC screening is effective in improving the participation rate, regardless of SES. However, significant inequalities were found in opportunistic screening, suggesting room for improvement in the overall equity of CRC screening.
Xuan Quy Luu,Kyeongmin Lee,Jae Kwan Jun,Mina Suh,Kyu-Won Jung,Kui Son Choi 한국역학회 2022 Epidemiology and Health Vol.44 No.-
OBJECTIVES This study investigated the effect of mammography screening on the long-term survival of breast cancer (BC) patients aged 40 years or older according to their screening history and duration since screening. METHODS The study cohort was organized from 3 nationwide databases of the Korean National Cancer Screening Program, the Korean Central Cancer Registry, and death certificates. We included 24,387 women diagnosed with invasive BC or ductal carcinoma in situ in 2008 and 2009 and followed up until December 31, 2019. Cox proportional-hazards regression was used to investigate the effect of BC screening on the risk of death. RESULTS Overall, 20,916 of 24,387 patients (85.8%) were alive at the end of the follow-up period (median: 10.5 years). The long-term survival rate was significantly lower in the never-screened group (80.3%) than in the screened group (88.9%) (p<0.001). A 35% reduction in the risk of BC death (hazard ratio [HR], 0.65; 95% confidence interval [CI], 0.60 to 0.70) from screening was observed. A subgroup analysis according to the cancer stage showed 62%, 36%, and 24% lower risks of BC death for the localized stage, regional stage, and distant stage, respectively. Women aged 40-49 years received the least benefit from BC screening (HR, 0.71; 95% CI, 0.62 to 0.81). CONCLUSIONS Mammography screening was effective in reducing the risk of BC-specific death in Asian women across all cancer stages. However, this effect was relatively small among women in their 40s, suggesting that more detailed and specialized screening strategies are needed for that age group.
Xuan Quy Luu,Kyeongmin Lee,Jeongseon Kim,Dae Kyung Sohn,Aesun Shin,Kui Son Choi 한국역학회 2021 Epidemiology and Health Vol.43 No.-
OBJECTIVES: This study aimed to validate a simple risk assessment tool for estimating the advanced colorectal neoplasia (ACN) risk at colonoscopy screenings and potential factors relevant for implementing this tool in the Korean population. METHODS: Our study analyzed data from the Cancer Screenee Cohort Study conducted by the National Cancer Center in Korea. The risk level was assessed using the Asia Pacific Colorectal Screening (APCS) score developed by the Asia-Pacific Working Group on Colorectal Cancer. Logistic regression models were used to examine the associations between colorectal-related outcomes and the risk level by APCS score. The discriminatory performance of the APCS score for various colorectal-related outcomes was assessed using C-statistics. RESULTS: In 12,520 individuals, 317 ACN cases and 4,528 adenoma cases were found. The APCS tool successfully classified the study population into different risk groups, and significant differences in the ACN rate and other outcomes were observed. The APCS score demonstrated acceptable discrimination capability with area under the curve values ranging from 0.62 to 0.65 for various outcomes. The results of the multivariate logistic regression model revealed that the high-risk group had a 3.1-fold higher risk of ACN (95% confidence interval, 2.08 to 4.67) than the average-risk group. Body mass index (BMI) was identified as a significant predictor of ACN in both multivariate and subgroup analyses. CONCLUSIONS: Our study highlighted significant differences in colorectal-related screening outcomes by colorectal risk level measured using the APCS score, and BMI could be used to improve the discriminatory capability of the APCS score.