Reverse Micellar Dyeing of Wool Fabric with Reactive Dyes

Yanming Wang,Yiu-lun Tang,Cheng-hao Lee,Chi-wai Kan 한국섬유공학회 2019 Fibers and polymers Vol.20 No.11

The approach of using reverse micelle with nonionic surfactant (poly(ethylene glycol), PEG)) as building blockhas been employed to investigate dyeability of wool fabrics with reactive dyes in a one-bath non-aqueous solvent system. Three colours were used and they were encapsulated in the core of the PEG-based reverse micelle under optimised processparameters (i.e. (i) Solvent volume to wool fabric weight ratio (v/w)=10:1; (ii) Surfactant/water mole ratio=0.04:1; (iii)Surfactant/co-surfactant mole ratio=1:8; (iv) Volume of water-pool for dye=0.5 ml; (v) Dyeing time=50 minutes; and (vi)Dyeing temperature=88 oC). Comparison of non-aqueous and aqueous-based (water-based) dyeing was conducted in terms ofdyeability as reflected by colour yield and colour fastness properties. Experimental results revealed that the reverse micellarnon-aqueous dyeing system can provide a better dyeing performance than aqueous-based dyeing system.

Risk Factors of Rehemorrhage in Postoperative Patients with Spontaneous Intracerebral Hemorrhage : A Case-Control Study

Ren, Yanming,Zheng, Jun,Liu, Xiaowei,Li, Hao,You, Chao The Korean Neurosurgical Society 2018 Journal of Korean neurosurgical society Vol.61 No.1

Objective : Rehemorrhage is the most severe complication of postoperative patients with spontaneous intracerebral hemorrhage. The aim of the present study was to assess independent predictors of rehemorrhage and find the possibility of preventing rehemorrhage in postoperative patients with spontaneous intracerebral hemorrhage (sICH). Methods : Medical records of 263 postoperative patients with sICH from our Hospital were reviewed. The relationships between rehemorrhage and parameters were examined by univariate and multivariate analyses. The parameters include time from onset to surgery, hematologic paremeters, neuroimaging characteristics, level and variability of systolic blood pressure, medical histories, operation duration, and blood loss. In addition, relationship between rehemorrhage and clinical outcome were analyzed by using multivariate analyses. Results : Thirty-five (13.31%) patients experienced rehemorrhage after operation. Multivariate analyses indicated that the following factors were independently associated with rehemorrhage : history of diabetes mellitus (odds ratio [OR], 2.717; 95% confidence interval [CI], 1.005-7.346; p=0.049), and midline shift (for every 1 mm increase, OR, 1.117; 95% CI, 1.029-1.214; p=0.009). Rehemorrhage was an independent risk factor of poor functional outcome (OR, 3.334; 95% CI, 1.094-10.155; p=0.034). Conclusion : Our finding revealed that history of diabetes mellitus and admission midline shift were possibly associated with rehemorrhage in postoperative patients with sICH.

Dyeing Wool Knitted Fabric in Nano-scale Reverse Micelle with Reactive Dyes - A Computer Colour Matching Study

Cheng-hao Lee,Yanming Wang,Yiu-lun Tang,Chi-wai Kan 한국섬유공학회 2021 Fibers and polymers Vol.22 No.5

The colour quality assessment of reverse micelle-based (in octane or nonane medium) and conventional waterbaseddyed wool knitted fabric has been investigated using computer colour matching (CCM) approach. Both water-basedand non-aqueous based dyeing methods exhibited no chromatic shift from the reflectance curves and established goodlinearity in the construction of calibration curves. The linearity of both calibration curves in terms of R2 value played a criticalrole in CCM. The colour yield obtained from reverse micellar dyed fabric samples was higher than the colour yield valuesfrom wool knitted fabrics dyed in water bath under different dye percentages. The CCM predicted concentrations were ingood agreement to theoretical concentrations for both dyeing systems. To conclude, the results showed that reverse micellardyeing in octane and nonane is capable of generating reliable colour recipes. The relative unlevelness indices (RUI) obtainedfrom dyed wool knitted fabrics using reverse micellar approach reveal good to excellent levelness, which fulfills therequirements of the textile processing industry. TEM picture illustrated that reverse micelles are in nano-scale and this couldenhance the dyeing effect of wool with reactive dyes.

A novel Au-loaded magnetic metal organic framework/graphene multifunctional composite: Green synthesis and catalytic application

Chao Bao,Lincheng Zhou,Yanming Shao,Qiong Wu,Hao Zhu,Ke Li 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.38 No.-

In the present study, Au-loaded magnetic metal organic frameworks (MOFs)/graphene multifunctionalcomposite were prepared. The well-dispersed nanoparticles were stabilized with 2D reduced grapheneoxide and MOFs, which acts as effective substitutes for more conventional polymer ligands that are usedto stabilize nanoparticles in a sol-immobilization procedure. The result shows the multifunctionalcomposite could overcome the drawbacks of MOFs catalysts (chemical instability). This study indicatedthat the as-prepared Au-loaded magnetic MOFs/graphene multifunctional composite has great potentialfor using in a wide range of applications.

A Computer Colour Matching (CCM) Study on Non-aqueous Reactive Dyeing of Cotton Fabric with Rhamnolipid (RL) Microbial Biosurfactant-Based Reverse Micelles

Alan Yiu Lun Tang,Cheng-hao Lee,Yanming Wang,Chi‑wai Kan 한국섬유공학회 2023 Fibers and polymers Vol.24 No.2

The feasibility of computer colour matching (CCM) of rhamnolipid-based reverse micellar dyeing system on cotton fibre inoctane media has been investigated and compared with that of conventional water-based dyeing system. Calibration resultsconfirm that the calibration curves of both systems are linear in structure. Reflectance curves reveal that both water-dyedand RL octane-dyed standard and batch samples are identical in shape without any peak shift and alteration of colour properties. The actual colour matching results of RL octane reverse micellar dyeing system are close to theoretical predictionwith percentage difference less than 25%, verifying the applicability of CCM on RL reverse micellar dyeing system. RLoctane-dyed samples can achieve good to excellent levelness, washing and rubbing fastness, which are comparable to thatof water-dyed samples. Further experiments have been conducted to analyse the zeta-potential surface charge, particle sizedistribution and Raman spectra of RL. Volatile organic compound (VOC) detection and solvent recovery have also beenconducted. Experimental results reveal that the leakage of octane solvent is between 2 and 3 ppm which is at acceptably lowlevel whilst more than 98% of octane can be recovered for further use after the RL reverse micellar dyeing process, validatingthe environmental friendliness potential of the RL octane reverse micellar dyeing system.

Effect of Solvent Dyeing Medium on Dye Encapsulation and Non-Aqueous Dyeing of Cotton Fabric with Rhamnolipid (RL) Microbial Biosurfactant-Based Reactive Dye Encapsulated Reverse Micelles

Yiu Lun Alan Tang,Cheng-hao Lee,Yanming Wang,Chi‑wai Kan 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12

Feasibility and applicability of rhamnolipid (RL) microbial biosurfactant-based reverse micellar non-aqueous system in different solvent medium for dyeing of cotton fabrics was investigated. In this study, several solvents, including heptane, octane, nonane, decamethylcyclopentasiloxane (D5), and paraffin liquid (PL), were chosen as the dyeing medium for non-aqueous dyeing of cotton fabrics with fixed dyeing parameters. The dyeing properties of these RL reverse micellar dyed samples in different solvent medium were examined and compared with the conventional water-dyed samples in terms of color yield (K/Ssum value), CIE L*a*b* values, color levelness and reflectance. Most non-aqueous RL reverse micellar dyed samples exhibited better color yield than conventional water-dyed samples. The surface morphology of dyed cotton samples and the dye encapsulation morphology in different solvent medium were observed by SEM and TEM, respectively. Most non-aqueous dyed samples yielded good to excellent levelness comparable to water-dyed samples. However, poor levelness and bad levelness were found for D5-and PL-dyed samples. Further modification of dyeing parameters would be needed to obtain the best dyeing results for D5-dyed and PL-dyed samples.

Effect of Ion Source Current on the Microstructure and Properties of Cr-DLC Coatings Prepared by Ion Beam-Assisted Arc Ion Plating

Yao Cai,Huidong Liu,Ye Ma,Qiang Wan,Hao Cheng,Yan Liu,Yanming Chen,Qingsong Mei,Bing Yang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2017 NANO Vol.12 No.5

Cr-containing diamond-like carbon (Cr-DLC) nanocomposite coatings were synthesized by ion beam-assisted arc ion plating with varying hollow cathode ion source (HCIS) currents. The morphologies, compositions and microstructures were characterized by scanning electronic microscopy (SEM), atomic force microscopy (AFM), X-Ray photoelectron spectrometer (XPS), Raman spectroscopy, grazing incidence X-ray diffraction (GIXRD) and high-resolution transmission electron microscopy (HRTEM). Hardness and friction coefficient were investigated by using nanoindentation and ball-on-disc tribometer, respectively. With no HCIS current, the coating exhibits the maximal growth rate and a rough surface, as well as lower hardness and elastic modulus. With the increasing HCIS current from 40 A to 80 A, the growth rate and the content of chromium carbide decrease obviously, the sp3/sp2 ratio increases initially to the maximum at the HCIS current of 60 A, the highest hardness and elastic modulus are obtained at the HCIS current of 50 A. It is also revealed that moderate HCIS current can reduce surface roughness obviously and promote tribological properties. The correlation of the HCIS current with the microstructure and performance of Cr-DLC coating has been established.

Ternary organic solar cells based on two compatible PDI-based acceptors with an enhanced power conversion efficiency

Weng, Kangkang,Li, Chao,Bi, Pengqing,Ryu, Hwa Sook,Guo, Yikun,Hao, Xiaotao,Zhao, Dahui,Li, Weiwei,Woo, Han Young,Sun, Yanming The Royal Society of Chemistry 2019 Journal of Materials Chemistry A Vol.7 No.8

<P>Ternary solar cells have been proven to be an effective way to increase the power conversion efficiency (PCE) of organic solar cells (OSCs). Up to now, research effort has mostly focused on fullerene derivatives and acceptor-donor-acceptor (A-D-A) type non-fullerene acceptor-based ternary solar cells, while perylene diimide (PDI)-based ternary devices have been rarely studied. In this contribution, we introduced a new type of ternary solar cell based on a PDI-based small-molecule acceptor (PBI-Por) and a polymer donor (PTB7-Th) with a third PDI-based polymer acceptor (PDI-V). The introduction of PDI-V into the ternary blends not only broadens the absorption of blend films but also increases the electron mobilities. As a result, a high efficiency of 9.43% was obtained for the ternary OSC, which is 20% higher than that of the binary OSC. Detailed studies indicate that PDI-V showed good compatibility with PBI-Por in the blend films, which demonstrates a promising way to fabricate high-performance PDI-based OSCs.</P>

Adjustable wavelength and lifetime in Mn4+ ion doped phosphate glasses

Chengguo Ming,Hanxiong Liu,Feng Song,Xiaobin Ren,Liqun An,Yanming Hao,Gangzhi Wang 한국물리학회 2013 Current Applied Physics Vol.13 No.6

Phosphate glasses doped with Mn4þ ion were prepared using high temperature melting method. Under 408 nm excitation, the peak wavelength and lifetime of the fluorescence are related to the Mn4þ ion concentration. With the increasing of Mn4þ ion concentration, the fluorescence wavelength varies from 605 nm to 685 nm and the lifetime increases from several microseconds to one millisecond. The fluorescence wavelength is variable and the lifetime is tunable for our materials.