HPU2 Journal of Science Natural Sciences and Technology最新文献

The roles of intermediate fluorophores on the optical properties of bottom-up synthesized carbon nanodots 中间荧光团对自下而上合成碳纳米点光学性质的影响

HPU2 Journal of Science Natural Sciences and Technology Pub Date : 2023-08-31 DOI: 10.56764/hpu2.jos.2023.2.2.68-82

Duy-Khanh Nguyen, Thanh-Son Le, Quang-Trung Le, Xuan-Dung Mai

{"title":"The roles of intermediate fluorophores on the optical properties of bottom-up synthesized carbon nanodots","authors":"Duy-Khanh Nguyen, Thanh-Son Le, Quang-Trung Le, Xuan-Dung Mai","doi":"10.56764/hpu2.jos.2023.2.2.68-82","DOIUrl":"https://doi.org/10.56764/hpu2.jos.2023.2.2.68-82","url":null,"abstract":"Carbon nanodots (CNDs) are the latest nano-sized carbon materials having unique properties such as biocompatible, highly photoluminescent, and nontoxic which are suitable for diverse applications including lighting, sensing, bioimaging, and biochemical analyzing. CNDs could be synthesized by top-down methods in which graphite is fragmented into nano-sized graphene dots. Alternatively, CNDs could be formed by a bottom-up synthetic strategy where organic molecules are fused together via complex condensation and carbonization processes. Although a great number of organic molecules have been used successfully to prepare CNDs there are very few CNDs that exhibit the quantum size effects. The absorption and emission properties of bottom-up synthesized CNDs rely vastly on molecular-like fluorophores which are the intermediates formed during the fusion of molecular precursors and are incorporated into CNDs in the later states of carbonization processes. This review aims to demonstrate recent understandings on the formation of intermediate fluorophores and their contribution to the optical properties of CNDs","PeriodicalId":496749,"journal":{"name":"HPU2 Journal of Science Natural Sciences and Technology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135991139","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Criteria for finite-time stability of singular large-scale discrete-time delay systems 广义大离散时滞系统有限时间稳定性判据

HPU2 Journal of Science Natural Sciences and Technology Pub Date : 2023-08-31 DOI: 10.56764/hpu2.jos.2023.2.2.11-21

Thi-Huong Pham, Huu-Du Hoang, Hong-Ngoc Nguyen

引用次数: 0

Propagation of a U16 hybid Eucalyptus line by plant cell tissue culture 桉树U16杂交系的细胞组织培养繁殖

HPU2 Journal of Science Natural Sciences and Technology Pub Date : 2023-08-31 DOI: 10.56764/hpu2.jos.2023.2.2.33-40

Tien-Vien Duong, Thu-Hien Phan Thi, Ngoc-Quynh Pham

{"title":"Propagation of a U16 hybid Eucalyptus line by plant cell tissue culture","authors":"Tien-Vien Duong, Thu-Hien Phan Thi, Ngoc-Quynh Pham","doi":"10.56764/hpu2.jos.2023.2.2.33-40","DOIUrl":"https://doi.org/10.56764/hpu2.jos.2023.2.2.33-40","url":null,"abstract":"Eucalyptus is one of the important plant species for paper pulp, fuel wood, and timber. In this study, a hybrid Eucalyptus, U16 line, was investigated for rapid in vitro propagation. The apical and adventitious shoots served as initial explants. These were free-disease symptoms that were collected for surface sterilization. Different disinfectants including mercuric and Javel solutions at different concentrations and treated times were performed. The results showed that explants were cleaned under taping water with soap, rinsed in 70oEtOH for 1 minute, and then immersed in 10% Javen solution for 15 minutes and 0.1% HgCl2 for 10 minutes gave the highest disinfection rate that was 46.5%. The modified MS medium included basal MS, 30 g/L sucrose, and 7 g/L agar supplemented with 20 ml/L of coconut water (MS medium*) was the most suitable for the rapid multiplication of Eucalyptus lines U16, the shoot multiplication coefficient reached 1.56. In vitro multiplication of eucalyptus U16 was carried out by culturing disinfected shoot segments on the MS* medium supplemented with BAP 1.5 mg/L and kinetin 1.0 mg/L which gave the highest shoot multiplication coefficient (3.24 shoot per explant). The in vitro rooting medium of the U16 line was basal MS supplemented with 1.0 mg NAA/L, the rooting rate was 90.49%, the number of roots was 8.3, and the roots expressed strong growth","PeriodicalId":496749,"journal":{"name":"HPU2 Journal of Science Natural Sciences and Technology","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135988999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Decay of charged Higgs boson in the 3-3-1 model with neutral leptons 带中性轻子的3-3-1模型中带电希格斯玻色子的衰变

HPU2 Journal of Science Natural Sciences and Technology Pub Date : 2023-08-31 DOI: 10.56764/hpu2.jos.2023.2.2.48-58

Trung-Hieu Tran, Minh-Vuong Nguyen, Thanh-Hung Ha

引用次数: 0

ON THE SECOND HILBERT COEFFICIENTS AND COHEN-MACAULAY RINGS 关于第二希尔伯特系数和cohen-macaulay环

HPU2 Journal of Science Natural Sciences and Technology Pub Date : 2023-08-31 DOI: 10.56764/hpu2.jos.2023.2.2.3-10

Van-Kien Do, Khanh-Linh Ha, Dai-Tan Tran, Ngoc-Yen Hoang

引用次数: 0

The photothermal effect of gold nanoparticles prepared by electrochemical method at different voltages 电化学法制备的金纳米颗粒在不同电压下的光热效应

HPU2 Journal of Science Natural Sciences and Technology Pub Date : 2023-08-31 DOI: 10.56764/hpu2.jos.2023.2.2.22-32

Xuan-Quang Nguyen, Van-Quang Nguyen, Thu-Thuy Nguyen Thi, Dinh-Lam Vu, Quang-Huy Tran

{"title":"The photothermal effect of gold nanoparticles prepared by electrochemical method at different voltages","authors":"Xuan-Quang Nguyen, Van-Quang Nguyen, Thu-Thuy Nguyen Thi, Dinh-Lam Vu, Quang-Huy Tran","doi":"10.56764/hpu2.jos.2023.2.2.22-32","DOIUrl":"https://doi.org/10.56764/hpu2.jos.2023.2.2.22-32","url":null,"abstract":"This paper was performed to evaluate the photothermal effect of pure gold nanoparticles (AuNPs) prepared by electrochemical method at different voltages, under laser irradiation in the safe wavelength range. The formation, morphological, and structural properties of AuNPs were analyzed by UV-vis absorption spectroscopy, transmission electron microscopy (TEM), and X-ray diffraction (XRD). The stability and dispersion of AuNPs were investigated by dynamic light scattering (DLS) and Zeta potential measurements. The photothermal effect was evaluated by the temperature change of the sample under the green laser irradiated at a wavelength of 532 nm. The results showed the formation of the AuNPs has a spherical shape and high purity; the particle size distribution is in the range of 10 - 40 nm depending on the synthesis voltage, and the absorption peak is in the range of 530 to 556 nm. The temperature of the AuNPs solution increased by 1.3 to 6 oC, compared to that of bi-distilled water under the same conditions of laser irradiation. This paper shows the photothermal effect of AuNPs prepared by the electrochemical method at different voltages, it changed markedly when irradiated with a green laser in the safe wavelength range.","PeriodicalId":496749,"journal":{"name":"HPU2 Journal of Science Natural Sciences and Technology","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135988997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Chemical components and anti-acetylcholinesterase activity of Piper lolot leaves oil 辣椒叶油的化学成分及抗乙酰胆碱酯酶活性

HPU2 Journal of Science Natural Sciences and Technology Pub Date : 2023-08-31 DOI: 10.56764/hpu2.jos.2023.2.2.41-47

Thuy -Van Do Thi, Ngoc-Linh Nguyen, Anh-Hung Nguyen

引用次数: 0

Green synthesis of UV absorber (E)-2-(((4-(benzyloxy)phenyl)imino)methyl)phenol by microwave method 微波法绿色合成紫外线吸收剂(E)-2-((4-(苯氧基)苯基)亚氨基)甲基)苯酚

HPU2 Journal of Science Natural Sciences and Technology Pub Date : 2023-08-31 DOI: 10.56764/hpu2.jos.2023.2.2.59-67

Kieu-Khanh Nguyen Thi, Anh-Thu Nguyen, Anh - Vu Ho Pham, Viet-Hai Le, Ngoc-An Nguyen, Thanh-Nguyen Huynh Le, Thanh-Thien Co, Hoang-Thai Nguyen, That-Quang Ton

{"title":"Green synthesis of UV absorber (E)-2-(((4-(benzyloxy)phenyl)imino)methyl)phenol by microwave method","authors":"Kieu-Khanh Nguyen Thi, Anh-Thu Nguyen, Anh - Vu Ho Pham, Viet-Hai Le, Ngoc-An Nguyen, Thanh-Nguyen Huynh Le, Thanh-Thien Co, Hoang-Thai Nguyen, That-Quang Ton","doi":"10.56764/hpu2.jos.2023.2.2.59-67","DOIUrl":"https://doi.org/10.56764/hpu2.jos.2023.2.2.59-67","url":null,"abstract":"In this work, a UV absorber compound (E)-2-(((4-(benzyloxy)phenyl)imino)methyl)phenol was synthesized by microwave method using a two steps protocol. In the first step, α-(4-hydroxyphenylimino)-o-cresol (1) was synthesized from 4-aminophenol and salicylaldehyde by circulating under microwave heating at 60 oC for 8 minutes, the reaction yield reached 82.91 %. In the second step (E)-2-(((4-(benzyloxy)phenyl)imino)methyl)phenol (2) was synthesized from precursor (1) and benzyl bromide by circulating under microwave heating at 80 oC for 3 minutes, the reaction yield reached 25.08 %. The overall yield for the synthesis of UV absorber 2 was 20.79 %. The molecular structures of precursor (1) and product (2) were analysed by high performance liquid chromatography - mass spectrometry (LC/MS) and nuclear magnetic resonance (NMR) methods. The UV absorbance of precursor (1) and product (2) was investigated by UV absorption spectrometry. The obtained results show that product (2) has a higher UV absorption intensity than precursor (1), the UV absorption region extends from 240 nm to 390 nm, the maximum absorption peak is at the wavelength (λmax) of 350 nm. The UV absorber (E)-2-(((4-(benzyloxy)phenyl)imino)methyl)phenol with cyclic structure, low molecular weight, and high UV absorbance has potential application as an UV absorber for greenhouse covering plastic, paint and ink systems.","PeriodicalId":496749,"journal":{"name":"HPU2 Journal of Science Natural Sciences and Technology","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135988996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0