Search results for: Zhengjun Li

Items from 1 to 20 out of 71 results

article

Shape Memory Polyurethane Composite With Fast Response to Near‐Infrared Light Based on Tannic Acid–Iron and Dynamic Phenol‐Carbamate Network

Yong Yong, Yang Liu, Zetian Zhang, Songbo Dai, more

Macromolecular Rapid Communications > 45 > 14 > n/a - n/a

Intelligent materials derived from green and renewable bio‐based materials garner widespread attention recently. Herein, shape memory polyurethane composite (PUTA/Fe) with fast response to near‐infrared (NIR) light is successfully prepared by introducing Fe³⁺ into the tannic acid‐based polyurethane (PUTA) matrix through coordination between Fe³⁺ and tannic acid. The results show that the excellent...

article

On‐column capping of poly dT media‐tethered mRNA accomplishes high capping efficiency, enhanced mRNA recovery, and improved stability against RNase

Shiyi Che, Xue Feng, Zhengjun Li, Zhiguo Su, more

Biotechnology and Bioengineering > 121 > 1 > 206 - 218

The messenger RNA (mRNA) 5′‐cap structure is indispensable for mRNA translation initiation and stability. Despite its importance, large‐scale production of capped mRNA through in vitro transcription (IVT) synthesis using vaccinia capping enzyme (VCE) is challenging, due to the requirement of tedious and multiple pre‐and‐post separation steps causing mRNA loss and degradation. Here in the present study,...

article

A high XPD performance design method for satellite CFRP dual‐reflector antenna without metallizing reflectors

JiXiang Wan, Li Li, QiaoShan Zhang, MeiLi Gao, more

Microwave and Optical Technology Letters > 65 > 10 > 2802 - 2803

The depolarization effect of carbon‐fiber reinforced plastics (CFRP) reflector is studied and a cross‐polarization discrimination (XPD) compensated method for dual‐reflector antenna without metallizing reflectors is presented in the paper. By setting the fibers direction of the main reflector orthogonal to that of the subreflector, the phase difference of the reflected electric field components from...

article

Nd: YAG laser activates the TGFBR1‐SMAD4‐Col3a1 axis via miR‐27a‐3p in photoaged rat skin

Xueyan Zhang, Shuna Sun, Zhengjun Li, Qing Sun

Photodermatology, Photoimmunology & Photomedicine > 39 > 3 > 269 - 272

article

In situ reaction of modified cellulose nanocrystals in shape memory polyacrylamide/gelatin composite hydrogel with enhanced performance

Weiwei Fan, Zhengjun Li

Polymer International > 72 > 6 > 578 - 585

In this work, 3‐methacryloxypropyltrimethoxysilane modified cellulose nanocrystals (MCNCs) were first synthesized through a hydrolysis‐condensation reaction and subsequently incorporated with acrylamide and gelatin by an in situ reaction to fabricate shape memory polyacrylamide/gelatin composite hydrogels (PG‐MCNCs). It was found that the rigid MCNCs with methacryl and silanol or hydroxyl groups could...

article

Enhancement and control of water vapor permeability and thermal conductivity of polymers: A review

Deyan Chen, Ze Liang, Yang Liu, Zetian Zhang, more

Polymers for Advanced Technologies > 34 > 5 > 1451 - 1466

The water vapor permeability (WVP) and thermal conductivity of polymers are of great significance in personal cooling and even in responding to energy crises. This review attempts to discuss the factors that affecting these two properties at first, and then discusses the relationship between them from the aspects of hydrophilicity, porous structure, biomimetic layered structure, and so on. Generally,...

article

Current Advances in the Roles of Doped Bioactive Metal in Biodegradable Polymer Composite Scaffolds for Bone Repair: A Mini Review

Fufen Li, Shan Li, Yang Liu, Zetian Zhang, more

Advanced Engineering Materials > 24 > 8 > n/a - n/a

The election of bone tissue engineering scaffolds material is mainly based on the bionics of natural bones. Although the content of trace elements in bone is low, the lack of them affects the growth and metabolism of bones, thus increasing the risk of orthopedic diseases caused by the deterioration of bone quality. Therefore, inspired by trace elements in natural bone, biodegradable polymer composite...

article

Superhydrophobic tough hierarchical porous thermal insulation composites prepared by in situ formation of silica aerogel in collagen fiber matrix

Kaifeng Yang, Zetian Zhang, Yang Liu, Shan Li, more

Journal of Applied Polymer Science > 139 > 33 > n/a - n/a

The serious problem of energy consumption and the requirement for sustainable development has attracted people's extensive attention. The application of high‐efficiency thermal insulation materials can reduce consumption and waste in the process of energy transfer, and is the most effective way to save energy and protect the environment. Among many thermal insulation materials, silica aerogel, especially...

article

Biomass/polyhedral oligomeric silsesquioxane nanocomposites: Advances in preparation strategies and performances

Junchao Wang, Weining Du, Zetian Zhang, Weiyao Gao, more

Journal of Applied Polymer Science > 138 > 2 > n/a - n/a

Polyhedral oligomeric silsesquioxane (POSS) as an organic–inorganic hybrid at a molecular level, has excellent mechanical properties, thermodynamic properties, dielectric properties and so on. In recent decades, POSS has been extensively used in modification of various polymers to prepare nanocomposites with enhanced comprehensive performances. Biomass materials such as chitosan, cellulose, silk protein,...

article

Efficient polymer solar cells utilizing solution‐processed interlayer based on different conjugated backbones

Yueqin Shi, Zhanyang Yu, Zhengjun Li, Xiaodong Zhao, more

Journal of Applied Polymer Science > 137 > 46 > n/a - n/a

The poor energy conversion efficiency for those polymer solar cells (PSCs) creates an obstacle for their commercialization. Inspired by this issue, two cathode interlayers, PBTBTz‐TMAI and PBTzPh‐TMAI based on benzothiadiazole (BT) and benzotriazole (BTz)‐conjugated or benzene (Ph) and BTz‐conjugated alternating units (both exhibits the same tetravalent amine‐end side chain), were synthesized via...

article

Action of silicic acid derived from sodium silicate precursor toward improving performances of porous gelatin membrane

Zetian Zhang, Jun Liu, Wenwei Gao, Liying Sun, more

Journal of Applied Polymer Science > 137 > 30 > n/a - n/a

To gain an insight into understanding how the silica network generated from hydrolysis and condensation of silicic acid, derived from sodium silicate, enhancing hydrothermal stability and mechanical properties of the leather, and particularly which active groups playing a main role for interaction of silica with collagen protein molecules, herein, effects of incorporated amino or carboxyl groups on...

article

Influence of the weight ratio of polydimethylsiloxane modified gelatin to silicone rubber on the potential performance of asymmetric bilayer membranes as wound dressings

Weining Du, Zetian Zhang, Zhengjun Li

Polymer International > 68 > 10 > 1739 - 1747

Asymmetric bilayer membranes have been regarded as ideal wound dressings for skin regeneration. Our previous work reported the potential advantages of polydimethylsiloxane modified gelatin/silicone rubber (PGE/SR) asymmetric bilayer membrane as a wound dressing. However, it is still unknown whether the proportion of the two components of the bilayer membrane has a prominent influence on its relevant...

article

Porous organosilicone modified gelatin hybrids with controllable and homogeneous in vitro degradation behaviors for potential application as skin regeneration scaffold

Weining Du, Zetian Zhang, Wenwei Gao, Zhengjun Li

Polymer International > 68 > 8 > 1411 - 1419

This work aims at investigating intensively the effects of organosilicone species and their dosage on the physicochemical and particularly the in vitro degradation properties of gelatin hybrids. We prepared various porous organosilicone modified gelatin hybrids with epoxy‐polydimethylsiloxane (PDMS) and/or glycidoxypropyltrimethoxysilane (GPTMS) and further systematically investigated their degradation...

article

Z‐Guggulsterone attenuates astrocytes‐mediated neuroinflammation after ischemia by inhibiting toll‐like receptor 4 pathway

Tianlong Liu, Minna Liu, Tiejun Zhang, Wenxing Liu, more

Journal of Neurochemistry > 147 > 6 > 803 - 815

Inflammatory damage plays a pivotal role in ischemic stroke pathogenesis and may represent one of the therapeutic targets. Z‐Guggulsterone (Z‐GS), an active component derived from myrrh, has been used to treat various diseases. The traditional uses suggest that myrrh is a good candidate for anti‐inflammatory damage. This study was to investigate the anti‐inflammatory and neuroprotective effects of...

article

Comparison and evaluation of in vitro degradation behaviors of organosilicone-modified gelatin hybrids

Zetian Zhang, Xiaona Han, Weining Du, Zhengjun Li, more

Journal of Sol-Gel Science and Technology > 2019 > 89 > 2 > 370-379

Degradation behavior is one of the most important characteristics of biomedical materials for their applications. Herein, we systematically investigate the in vitro degradation behaviors of γ-glycidoxypropyltrimethoxysilane (GT) and/or epoxy-terminated polydimethylsiloxane oligomer (ES)-modified gelatin hybrid materials in physiological conditions. Their microscopic appearance, chemical composition,...

article

A diamond/graphite nanoplatelets electrode for anodic stripping voltammetric trace determination of Zn(II), Cd(II), Pb(II) and Cu(II)

Zhaofeng Zhai, Nan Huang, Hao Zhuang, Lusheng Liu, more

Applied Surface Science > 2018 > 457 > C > 1192-1201

A platform for the determination of Zn(II), Cd(II), Pb(II) and Cu(II) has been proposed based on a novel diamond/graphite (D/G) nanoplatelets film electrode using differential pulse anodic stripping voltammetry method. The microstructure and the composition of the film were characterized by scanning electron microscope (SEM), atomic force microscope (AFM), Raman spectroscopy and transmission electron...

article

Biodegradable porous organosilicone‐modified collagen fiber matrix: Synthesis and high oil absorbency

Weining Du, Guochen Dai, Baochuan Wang, Zhengjun Li, more

Journal of Applied Polymer Science > 135 > 20 > n/a - n/a

We used hexadecyl trimethyl ammonium bromide as a phase transfer catalyst (PTC) to enhance the effectiveness of a heterogeneous reaction system composed of collagen fiber (CF) and organosilicone modifying agents including epoxy‐polydimethylsiloxane (ES) and/or γ‐glycidoxypropylthrimethoxysilane (GS), in order to improve oil sorption behaviors of the modified products as sorbents. The effects of PTC...

article

Tilapia and human CLIC2 structures are highly conserved

Jiao Zeng, Zhengjun Li, Eei Yin Lui, Siew Hong Lam, more

Biochemical and Biophysical Research Communications > 2018 > 495 > 2 > 1752-1757

Chloride intracellular channels (CLICs) exist in soluble and membrane bound forms. We have determined the crystal structure of soluble Clic2 from the euryhaline teleost fish Oreochromis mossambicus. Structural comparison of tilapia and human CLIC2 with other CLICs shows that these proteins are highly conserved. We have also compared the expression levels of clic2 in selected osmoregulatory organs...

chapter

A high-precision and wide-range method of frequency measurement in the new energy power grid connection

Zhengjun Li, Penghao Wang

2017 Chinese Automation Congress (CAC) > 380 - 385

2017 Chinese Automation Congress (CAC)

In the new energy power grid connection, frequency is an important indicator of power grid's operating state. The frequency in power system is easily affected by the access and exit of new-energy generators and appears large fluctuations, and thus it is essential to develop a measurement method that is highly precise and widely ranged. This paper initially introduced a variety of common methods of...

chapter

The study of intelligent control algorithm in CPAP ventilator

Zhengjun Li, Miao Zhang, Minning Du

2017 Chinese Automation Congress (CAC) > 386 - 391

2017 Chinese Automation Congress (CAC)

How to develop an intelligent ventilator and control it well to provide a better experience and treatment effect for respiratory patients is still a difficult task needed to be solved. The existing problems focus on the control algorithm and the mechanical structure. Dedicated to these two problems, the paper proposes a design of CPAP ventilator based on the ANN algorithm. Firstly, the paper introduces...

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INFONA - science communication portal

Search results for: Zhengjun Li

Shape Memory Polyurethane Composite With Fast Response to Near‐Infrared Light Based on Tannic Acid–Iron and Dynamic Phenol‐Carbamate Network

On‐column capping of poly dT media‐tethered mRNA accomplishes high capping efficiency, enhanced mRNA recovery, and improved stability against RNase

A high XPD performance design method for satellite CFRP dual‐reflector antenna without metallizing reflectors

Nd: YAG laser activates the TGFBR1‐SMAD4‐Col3a1 axis via miR‐27a‐3p in photoaged rat skin

In situ reaction of modified cellulose nanocrystals in shape memory polyacrylamide/gelatin composite hydrogel with enhanced performance

Enhancement and control of water vapor permeability and thermal conductivity of polymers: A review

Current Advances in the Roles of Doped Bioactive Metal in Biodegradable Polymer Composite Scaffolds for Bone Repair: A Mini Review

Superhydrophobic tough hierarchical porous thermal insulation composites prepared by in situ formation of silica aerogel in collagen fiber matrix

Biomass/polyhedral oligomeric silsesquioxane nanocomposites: Advances in preparation strategies and performances

Efficient polymer solar cells utilizing solution‐processed interlayer based on different conjugated backbones

Action of silicic acid derived from sodium silicate precursor toward improving performances of porous gelatin membrane

Influence of the weight ratio of polydimethylsiloxane modified gelatin to silicone rubber on the potential performance of asymmetric bilayer membranes as wound dressings

Porous organosilicone modified gelatin hybrids with controllable and homogeneous in vitro degradation behaviors for potential application as skin regeneration scaffold

Z‐Guggulsterone attenuates astrocytes‐mediated neuroinflammation after ischemia by inhibiting toll‐like receptor 4 pathway

Comparison and evaluation of in vitro degradation behaviors of organosilicone-modified gelatin hybrids

A diamond/graphite nanoplatelets electrode for anodic stripping voltammetric trace determination of Zn(II), Cd(II), Pb(II) and Cu(II)

Biodegradable porous organosilicone‐modified collagen fiber matrix: Synthesis and high oil absorbency

Tilapia and human CLIC2 structures are highly conserved

A high-precision and wide-range method of frequency measurement in the new energy power grid connection

The study of intelligent control algorithm in CPAP ventilator

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