Preparation, characterization, and properties of novel meglumine-based polysiloxane surfactants

Yanyun Bai,Jinxing Li,Xiumei Tai,Guoyong Wang 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.84 No.-

A series of meglumine-based polysiloxane surfactants, (PSim-n) with different numbers of megluminebranches were prepared. The formed surfactants were characterized by FT-IR and NMR techniques. Physiochemical properties, such as surface activity, aggregation behavior, and wettability, were closelyexamined and used to differentiate the various samples. Thefindings demonstrate that PSim-n surfactantspossess high surface activity and can wet-out a parafilm surface at all but extremely low concentrations. Furthermore, PSi6-4, the surfactant with the highest meglumine concentration, can form larger complexaggregates in aqueous solutions.

Au@Ag Core−Shell Nanocubes with Finely Tuned and Well-Controlled Sizes, Shell Thicknesses, and Optical Properties

Ma, Yanyun,Li, Weiyang,Cho, Eun Chul,Li, Zhiyuan,Yu, Taekyung,Zeng, Jie,Xie, Zhaoxiong,Xia, Younan American Chemical Society 2010 ACS NANO Vol.4 No.11

<P>This paper describes a facile method for generating Au@Ag core−shell nanocubes with edge lengths controllable in the range of 13.4−50 nm. The synthesis involved the use of single-crystal, spherical Au nanocrystals of 11 nm in size as the seeds in an aqueous system, with ascorbic acid serving as the reductant and cetyltrimethylammonium chloride (CTAC) as the capping agent. The thickness of the Ag shells could be finely tuned from 1.2 to 20 nm by varying the ratio of AgNO<SUB>3</SUB> precursor to Au seeds. We also investigated the growth mechanism by examining the effects of seeds (capped by CTAC or cetyltrimethylammonium bromide(CTAB)) and capping agent (CTAC <I>vs</I> CTAB) on both size and shape of the resultant core−shell nanocrystals. Our results clearly indicate that CTAC worked much better than CTAB as a capping agent in both the syntheses of Au seeds and Au@Ag core−shell nanocubes. We further studied the localized surface plasmon resonance properties of the Au@Ag nanocubes as a function of the Ag shell thickness. By comparing with the extinction spectra obtained from theoretical calculations, we derived a critical value of <I>ca.</I> 3 nm for the shell thickness at which the plasmon excitation of the Au cores would be completely screened by the Ag shells. Moreover, these Au@Ag core−shell nanocubes could be converted into Au-based hollow nanostructures containing the original Au seeds in the interiors through a galvanic replacement reaction.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2010/ancac3.2010.4.issue-11/nn102237c/production/images/medium/nn-2010-02237c_0001.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn102237c'>ACS Electronic Supporting Info</A></P>

Decision Support System based Site Quality Evaluation for Plantation

Han Yanyun,Wu Baoguo,Wang Chaoqun 보안공학연구지원센터 2014 International Journal of Smart Home Vol.8 No.5

智慧城市建设对碳排放水平的影响

Qiao, Yanyun,He, Jingjing 성균관대학교 성균중국연구소 2023 중국사회과학논총 Vol.5 No.2

本文以中国评定智慧城市为例,运用渐进式双重差分模型实证研究智慧 城市建设对减少碳排放的影响。基准回归结果表明,“智慧城市”的试点具有显著 的碳排放控制效应,多种稳健性检验的结果也再次印证了本文的结论。动态分析表 明,智慧城市的碳排放控制效应具有较长的政策时滞,大约到第三年政策的生态效 应逐渐显现。中介效应模型表明,智慧城市通过促进城市技术创新和高新技术产业 集聚进而削弱城市碳排放水平。调节效应模型表明,政府的环境规制行为强化了智 慧城市的碳排放控制效应,经济逐步转向高质量发展尚未对城市碳排放起到调节作 用。空间杜宾模型表明智慧城市的碳排放控制效应具有空间溢出性。本文的研究对 发展中国家解决城市化与低碳发展之间的矛盾具有参考价值,对发展中国家如何实 现低碳发展、发达国家进一步降低碳排放量具有借鉴意义,对于应对全球气候危机 也具有重要的现实意义。

Adsorption, aggregation and wetting behaviors of biodegradable surfactant: Perfluoropolyether quaternary ammonium salt

Jixian Shen,Yanyun Bai,Qiwen Yin,Wanxu Wang,Xiaoyuan Ma,Guoyong Wang 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.56 No.-

A novel cationicfluorinated surfactant, (PFP-AI), was synthesized via amidation and quaterisationsuccessively with perfluorinated acylfluride (PFPF) as starting material. Their structure was analyzed byFT-IR, 1H NMR and 19F NMR. The TG indicated the PFP-AI possess thermal stability with initiationdecomposition temperatures about 217 C. The physicochemical properties of PFP-AI were studiedsystematically by equilibrium surface tension, dynamic surface tension, dynamic light scattingmeasurement (DLS) and transmission electron microscopy (TEM). The results revealed the PFP-AIexhibited high surface activity (gcmc = 16.4 mN/m) and could aggregate into vesicles at the concentrationof 4.15 mmol/L. Furthermore, contact angle measurements demonstrated that PFP-AI exhibited efficientwettability on the hydrophobic surface.

Novel coal and siloxane based surfactants: Bola polysiloxanes modified with butynediol-ethoxylate and their properties

Pengxiao Fang,Yanyun Bai,Xiaoyuan Ma,Xiumei Tai,Wanxu Wang,Guoyong Wang 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.59 No.-

Novel polysiloxane amphiphiles obtained by introducing coal-based amphiphiles (butynediol ethoxylate) into polysiloxanes based on hydrosilylation reaction by two steps: first, synthesizing hydride terminated polysiloxane with different degree of polymerization (HTP); second, butynediol-ethoxylate was grafted on hydride terminated polysiloxane at terminals to get bola coal-based polysiloxane amphiphiles (EO-PSi-EO). In our work, EO-PSi-EO were compared together to investigate the impacts of different ratios of hydrophilic and hydrophobic groups on its properties. A conclusion was obtained from the work that EO-PSi-EO with various hydrophobic backbones have low surface tension, rich aggregate behavior, excellent wetting property and low foam.

An Improved Harris-SIFT Algorithm Based on Rotation-invariant LBP Operator

Lei Yang,Yanyun Ren,Jiyuan Cai,Huosheng Hu 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.6

Feature-points matching is an important concept in binocular stereo vision. The procession of multi-scale feature-points matching in classical Harris-SIFT algorithm is time-consuming and has high complexity when describing the feature-points. This paper proposed a new improved Harris-SIFT algorithm based on rotation-invariant LBP (Local binary patterns) operator. Firstly, the Harris operator is used to extract feature points from DOG (Difference of Gaussian) scale space. Then, the dominant direction of feature point is calculated and 81-dimensional rotation-invariant LBP descriptors are extracted when the rotation matching window is coordinated to this direction. At last, Best-Bin-First (BBF) algorithm is used to search the matching points between the two sets of feature points. Experimental results show that the proposed algorithm is lower time-consuming than classical Harris-SIFT algorithm and remains the similar matching correct rate.

Hair Growth Promoting Effects of 650 nm Red Light Stimulation on Human Hair Follicles and Study of Its Mechanisms via RNA Sequencing Transcriptome Analysis

( Kai Yang ),( Yulong Tang ),( Yanyun Ma ),( Qingmei Liu ),( Yan Huang ),( Yuting Zhang ),( Xiangguang Shi ),( Li Zhang ),( Yue Zhang ),( Ji’an Wang ),( Yifei Zhu ),( Wei Liu ),( Yimei Tan ),( Jinran 대한피부과학회 2021 Annals of Dermatology Vol.33 No.6

Background: Androgenetic alopecia (AGA) leads to thinning of scalp hair and affects 60%~70% of the adult population worldwide. Developing more effective treatments and studying its mechanism are of great significance. Previous clinical studies have revealed that hair growth is stimulated by 650-nm red light. Objective: This study aimed to explore the effect and mechanism of 650-nm red light on the treatment of AGA by using ex vivo hair follicle culture. Methods: Human hair follicles were obtained from hair transplant patients with AGA. Hair follicles were cultured in Williams E medium and treated with or without 650-nm red light. Real-time RT-PCR and immunofluorescence staining were used to detect the expression level of genes and proteins in hair follicles, respectively. RNA-sequencing analysis was carried out to reveal the distinct gene signatures upon 650 nm treatment. Results: Low-level 650 nm red light promoted the proliferation of human hair follicles in the experimental cultured-tissue model. Consistently, 650 nm red light significantly delayed the transition of hair cycle from anagen to catagen in vitro. RNA-seq analysis and gene clustering for the differentially expressed genes suggests that leukocyte transendothelial migration, metabolism, adherens junction and other biological process maybe involved in stimulation of hair follicles by 650-nm red light treatment. Conclusion: The effect of 650-nm red light on ex vivo hair follicles and the transcriptome set which implicates the role of red light in promoting hair growth and reversing of miniaturization process of AGA were identified.

In-vitro performance and fracture strength of thin monolithic zirconia crowns

Paul Weigl,Anna Sander,Yanyun Wu,Roland Felber,Hans-Christoph Lauer,Martin Rosentritt 대한치과보철학회 2018 The Journal of Advanced Prosthodontics Vol.10 No.2

PURPOSE. All-ceramic restorations required extensive tooth preparation. The purpose of this in vitro study was to investigate a minimally invasive preparation and thickness of monolithic zirconia crowns, which would provide sufficient mechanical endurance and strength. MATERIALS AND METHODS. Crowns with thickness of 0.2 mm (group 0.2, n=32) or of 0.5 mm (group 0.5, n=32) were milled from zirconia and fixed with resin-based adhesives (groups 0.2A, 0.5A) or zinc phosphate cements (groups 0.2C, 0.5C). Half of the samples in each subgroup (n=8) underwent thermal cycling and mechanical loading (TCML)(TC: 5°C and 55°C, 2×3,000 cycles, 2 min/cycle; ML: 50 N, 1.2×106 cycles), while the other samples were stored in water (37°C/24 h). Survival rates were compared (Kaplan-Maier). The specimens surviving TCML were loaded to fracture and the maximal fracture force was determined (ANOVA; Bonferroni; α=.05). The fracture mode was analyzed. RESULTS. In both 0.5 groups, all crowns survived TCML, and the comparison of fracture strength among crowns with and without TCML showed no significant difference (P=.628). Four crowns in group 0.2A and all of the crowns in group 0.2C failed during TCML. The fracture strength after 24 hours of the cemented 0.2 mm-thick crowns was significantly lower than that of adhesive bonded crowns. All cemented crowns provided fracture in the crown, while about 80% of the adhesively bonded crowns fractured through crown and die. CONCLUSION. 0.5 mm thick monolithic crowns possessed sufficient strength to endure physiologic performance, regardless of the type of cementation. Fracture strength of the 0.2 mm cemented crowns was too low for clinical application.

Understanding the Effects of Different Edible Coating Materials on the Storability of 'Bing' Sweet Cherries

Park, Su-Il,Zhao, Yanyun Korea Society of Packaging Science and Technology 2006 한국포장학회지 Vol.12 No.1

'Bing' 체리 (P. avium L.)는 짧은 저장성을 가지는 신선 농산물로, 코팅에 의한 저장성 향상 가능성을 알아보았다. 네 종류 ($Semperfresh^{(R)}$, calcium caseinate, chitosan, or TIC $Pretested^{(R)}$ colloid 911)의 식이성 코팅 재료를 1% 농도로 체리에 코팅 처리 한 후 $2^{\circ}C$, 88% 상대습도 조건에서 35일 간 저장하며 코팅 물질에 따른 저장성 및 품질변화를 확인하였다. $Semperfresh^{(R)}$ 코팅은 체리의 전반적인 품질 및 저장성 향상에 기여하였는데, 무게 감소를 줄이고 표면 색변화를 억제하는 것으로 관측되었다. 키토산을 기본으로 하는 코팅은 저장 중 곰팡이 발생을 억제하는데 효과적이었다. 하지만 colloid 911 과 calcium caseinate를 이용한 코팅은 신선 체리의 저장성 향상에 기여하지 못했는데, 이들 친수성 코팅 물질의 경우, 체리의 표피층과 코팅 물질 사이의 상호작용에 의해서 체리의 자연적인 보호층인 큐티클 층이 영향을 받음으로 체리의 무게 감소가 저장 기간 중에 촉진되었던 것으로 사료된다. 'Bing' sweet cherries (P. avium L.) were coated with four different coating materials at 1% concentration ($Semperfresh^{(R)}$, calcium caseinate, chitosan, or TIC $Pretested^{(R)}$ colloid 911)and stored at $2.0^{\circ}C$ and 88% RH up to 35 days. The influence of different coating materials on the storability of fresh cherries was investigated. $Semperfresh^{(R)}$ coatings significantly improved overall quality of fresh cherries by decreasing weight loss and improving color stability, and chitosan-based coatings were effective in controlling mold incidence. However, colloid 911 and calcium caseinate coatings did not show significant benefit in preventing quality deterioration of fresh cherry during storage, probably due to their hydrophilic nature leads to exacerbated weight loss and shriveling with the possible interactions between coating materials and cherries epidermal layers.