scholarly journals Stimuli-Responsive Shape Switching of Polymer Colloids by Temperature-Sensitive Absorption of Solvent

2016 ◽  
Vol 55 (34) ◽  
pp. 9952-9955 ◽  
Author(s):  
Huaguang Wang ◽  
Binghui Li ◽  
Arjun G. Yodh ◽  
Zexin Zhang
Keyword(s):  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Polymer Colloids

scholarly journals Stimuli-Responsive Shape Switching of Polymer Colloids by Temperature-Sensitive Absorption of Solvent

2016 ◽  
Vol 128 (34) ◽  
pp. 10106-10109 ◽  
Author(s):  
Huaguang Wang ◽  
Binghui Li ◽  
Arjun G. Yodh ◽  
Zexin Zhang
Keyword(s):  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Polymer Colloids

scholarly journals Dual-stimuli responsive liposomes using pH- and temperature-sensitive polymers for controlled transdermal delivery

2017 ◽  
Vol 8 (9) ◽  
pp. 1507-1518 ◽  
Author(s):  
Naoko Yamazaki ◽  
Takumi Sugimoto ◽  
Mitsuhiro Fukushima ◽  
Ryoma Teranishi ◽  
Aki Kotaka ◽  
...  
Keyword(s):  
Transdermal Delivery ◽  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Transdermal Penetration

The use of skin environment-sensitive liposomes for transdermal penetration is beneficial for improving cosmetic efficacy.

scholarly journals Radiolytic synthesis of gold nanoparticles in HEMA-based hydrogels: Potentialities for imaging nanocomposites

Nukleonika ◽  
2021 ◽  
Vol 66 (4) ◽  
pp. 165-177
Author(s):  
Katsiaryna Dziarabina ◽  
Uliana Pinaeva ◽  
Sławomir Kadłubowski ◽  
Piotr Ulański ◽  
Xavier Coqueret
Keyword(s):  
Gold Nanoparticles ◽  
Monomer Conversion ◽  
Thermomechanical Properties ◽  
Temperature Sensitive ◽  
Trimethylammonium Chloride ◽  
Stimuli Responsive ◽  
Monomer Composition ◽  
Swelling Characteristics ◽  
High Degree ◽  
Radiolytic Synthesis

Abstract This article reports on the radiolytic synthesis of nanocomposites containing gold nanoparticles (AuNPs) within two types of hydrogels based on 2-hydroxyethyl methacrylate (HEMA): (i) plain networks with various contents in ethylene glycol dimethacrylate (EGDMA), as a cross-linker and (ii) stimuli-responsive (SR) networks prepared from these monomers copolymerized with [2-(methacryloyloxy)ethyl]trimethylammonium chloride (MADQUAT) to confer pH-switchable swelling. Hydrogels were prepared by photopolymerization with well-defined composition and a high degree of monomer conversion using two experimental procedures, as xerogels or in aqueous solution. Besides MADQUAT, acrylic acid (AA) or N-isopropylacrylamide have been tested as copolymers, yielding pHor temperature-sensitive hydrogels, respectively. Isothermal swelling in water was affected by monomer composition. Electron beam (EB) irradiation at doses up to 100 kGy of poly(HEMA) xerogels and water-swollen networks prepared with 0.5 wt% of EGDMA had a moderate impact on swelling characteristics and thermomechanical properties of the plain materials, whereas small amounts of extractables were formed. Poly(HEMA)-based nanocomposites containing AuNPs were successfully obtained by EB irradiation of samples swollen by aqueous solutions of Au(III). The effects of dose and cross-linking density on the formation of AuNPs were monitored by UV-visible spectroscopy. Irradiation at well-defined temperatures of the Au(III)-loaded SR hydrogels induced the formation of nanoparticles with size-dependent features, whereas the efficiency of Au(III) reduction at 10 kGy was not significantly affected by the network structure. EB-induced reduction of Au(III) in poly(HEMA) hydrogels using a lead mask to generate well-defined patterns yielded coloured and long-lasting images in the zones where the nanocomposite was formed.

Dual CO2/temperature-responsive diblock copolymers confer controlled reversible emulsion behavior

2019 ◽  
Vol 10 (21) ◽  
pp. 2641-2646 ◽  
Author(s):  
Yeong-Tarng Shieh ◽  
Pei-Yu Tai ◽  
Chih-Chia Cheng
Keyword(s):  
Diblock Copolymers ◽  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Temperature Responsive

Dual-stimuli responsive diblock copolymers possessing unique temperature-sensitive and CO2/N2-switching ability were successfully developed to promote efficient manipulation of reversible emulsification processes.

scholarly journals Study on the Effect of 1-Butanol Soluble Lignin on Temperature-Sensitive Gel

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1109 ◽  
Author(s):  
Pan Jiang ◽  
Yi Cheng ◽  
Sheng Yu ◽  
Jie Lu ◽  
Haisong Wang
Keyword(s):  
Environmental Temperature ◽  
Hydroxyl Group ◽  
Solution Temperature ◽  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Agricultural Field ◽  
Absorption Properties ◽  
Critical Solution Temperature ◽  
Temperature Sensitive Hydrogel ◽  
Soluble Lignin

A protocol for the fractionation of lignin with 1-butanol as solvent has been proposed in order to improve the utilization of industry alkali lignin. 1-butanol soluble lignin (BSL) was used as a building block for temperature-sensitive hydrogel with N-isopropylacrylamide (NIPAAm) through graft polymerization. The result shows that 1-butanol fractionation is an effective method to improve the molecular weight homogeneity of lignin (PDI, 2.5 to 1.83) and increase the hydroxyl group content (0.585–1.793 mmol/g). The incorporation of BSL into the temperature-sensitive hydrogel can enhance the thermal stability and increase the hydrophobicity of the gel, which leads to a decrease in lower critical solution temperature (LCST). In addition, the compression strength, swelling ratio, and pore size of the gel can be adjusted by the dosage of lignin. This stimuli-responsive gel, with an LCST around 32 °C, is expected to be applied in the agricultural field as a pesticide carrier by stimulating release and absorption properties based on the change in natural environmental temperature.

scholarly journals Stimuli-Sensitive Hydrogel Based on N-Isopropylacrylamide and Itaconic Acid for Entrapment and Controlled Release ofCandida rugosaLipase under Mild Conditions

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
Nikola Milašinović ◽  
Zorica Knežević-Jugović ◽  
Nedeljko Milosavljević ◽  
Marija Lučić Škorić ◽  
Jovanka Filipović ◽  
...  
Keyword(s):  
Gastrointestinal Tract ◽  
Itaconic Acid ◽  
Candida Rugosa ◽  
Entrapment Efficiency ◽  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Mild Conditions ◽  
The Matrix ◽  
Model Protein ◽  
Stimuli Sensitive

Stimuli responsive pH- and temperature-sensitive hydrogel drug delivery systems, as those based on N-isopropylacrylamide (NiPAAm) and itaconic acid (IA), have been attracting much of the attention of the scientific community nowadays, especially in the field of drug release. By adjusting comonomer composition, the matrix is enabled to protect the incorporated protein in the highly acidic environment of upper gastrointestinal tract and deliver it in the neutral or slightly basic region of the lower intestine. The protein/poly(NiPAAm-co-IA) hydrogels were synthetized by free radical crosslinking copolymerization and were characterized concerning their swelling capability, mechanical properties, and morphology. The pore structure and sizes up to 1.90 nm allowed good entrapment of lipase molecules. Model protein, lipase fromCandida rugosa,was entrapped within hydrogels upon mild conditions that provided its protection from harmful environmental influences. The efficiency of the lipase entrapment reached 96.7%, and was dependent on the initial concentration of lipase solution. The swelling of the obtained hydrogels in simulated pH and temperature of gastrointestinal tract, the lipase entrapment efficiency, and its release profiles from hydrogels were investigated as well.

scholarly journals Cooperatively assembled liquid crystals enable temperature-controlled Förster resonance energy transfer

2021 ◽  
Author(s):  
Zhen-Qiang Yu ◽  
Xiaodong Li ◽  
Wei Wan ◽  
Xin-Shun Li ◽  
Kuo Fu ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Nile Red ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Forster Resonance Energy Transfer ◽  
Optical Modulation ◽  
Förster Resonance Energy Transfer ◽  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Förster Resonance

A temperature-sensitive Förster resonance energy transfer system was constructed using a highly emissive liquid crystal co-assembled with Nile red, enabling thermo-optical modulation for controlling and directing light in stimuli-responsive devices.

Synthesis and Characterization of pH and Temperature-Sensitive Semi-IPN Hydrogels

2014 ◽  
Vol 1053 ◽  
pp. 224-230
Author(s):  
Shan Jiang ◽  
Xia Qian Li ◽  
Qiang Yu
Keyword(s):  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Swelling Properties ◽  
Dimethyl Ammonium ◽  
Swelling Rate ◽  
Ph And Temperature Sensitivity ◽  
Responsive Behavior ◽  
Radical Solution ◽  
Diallyl Dimethyl Ammonium Chloride

A series of novel cross-linked poly N-isopropylacrylamide (PNIPAM)/poly diallyl dimethyl ammonium chloride (PDMDAAC) semi-IPN hydrogels were synthesized through free radical solution polymerization in water at 30°C. FTIR was used to characterize the structure of resultant hydrogels. The pH and temperature sensitivity of hydrogels were systematicly studied, and the swelling properties of hydrogels were also explored. The results show that the semi-IPN hydrogels have both temperature and pH sensitivities. The hydrogels exhibit fast swelling rate and excellent stimuli-responsive behavior.

scholarly journals Smart hydrogels based on itaconic acid for biomedical application

2009 ◽  
Vol 63 (6) ◽  
pp. 603-610
Author(s):  
Simonida Tomic ◽  
Maja Micic ◽  
Bojana Krezovic ◽  
Sava Dobic ◽  
Edin Suljovrujic ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Itaconic Acid ◽  
Biomedical Applications ◽  
Biomedical Application ◽  
In Vitro Study ◽  
Mechanical Analysis ◽  
Wound Dressings ◽  
Temperature Sensitive ◽  
Stimuli Responsive

pH and temperature sensitive hydrogels, based on 2-hydroxyethyl methacrylate (HEMA) and itaconic acid (IA) copolymers, were prepared by gamma irradiation and characterized in order to examine their potential use in biomedical applications. The influence of comonomer ratio in these smart copolymers on their morphology, mechanical properties, biocompatibility and microbe penetration capability was investigated. The mechanical properties of copolymers were investigated using the dynamic mechanical analysis (DMA), while their morphology was examined by scanning electron microscopy (SEM). The morphology and mechanical properties of these hydrogels were found to be suitable for most requirements of biomedical applications. The in vitro study of P(HEMA/IA) biocompatibility showed no evidence of cell toxicity nor any considerable hemolytic activity. Furthermore, the microbe penetration test showed that neither Staphylococcus aureus nor Escherichia coli passed through the hydogel dressing; thus the P(HEMA/IA) dressing could be considered a good barrier against microbes. All results indicate that stimuli-responsive P(HEMA/IA) hydrogels have great potential for biomedical applications, especially for skin treatment and wound dressings.

scholarly journals Quantifying the bending of bilayer temperature-sensitive hydrogels

2017 ◽  
Vol 473 (2200) ◽  
pp. 20170092 ◽  
Author(s):  
Chenling Dong ◽  
Bin Chen
Keyword(s):  
Finite Deformation ◽  
Deformation Theory ◽  
Mechanical Performance ◽  
Temperature Sensitive ◽  
Stimuli Responsive ◽  
Optimal Thickness ◽  
Change Analysis ◽  
Temperature Responsive ◽  
Finite Deformation Theory ◽  
Responsive Hydrogels

Stimuli-responsive hydrogels can serve as manipulators, including grippers, sensors, etc., where structures can undergo significant bending. Here, a finite-deformation theory is developed to quantify the evolution of the curvature of bilayer temperature-sensitive hydrogels when subjected to a temperature change. Analysis of the theory indicates that there is an optimal thickness ratio to acquire the largest curvature in the bilayer and also suggests that the sign or the magnitude of the curvature can be significantly affected by pre-stretches or small pores in the bilayer. This study may provide important guidelines in fabricating temperature-responsive bilayers with desirable mechanical performance.

Sign in / Sign up

Export Citation Format

Share Document