Monodisperse Selectively Permeable Hydrogel Capsules Made from Single Emulsion Drops

2021 ◽  
Author(s):  
Mathias Steinacher ◽  
Alice Cont ◽  
Huachuan Du ◽  
Alexandre Persat ◽  
Esther Amstad
Keyword(s):  
Emulsion Drops ◽  
Hydrogel Capsules

scholarly journals Application of Thermal Resistant Gemini Surfactants in Highly Thixotropic Water-in-oil Drilling Fluid System

2019 ◽  
Vol 17 (1) ◽  
pp. 1435-1441
Author(s):  
Yonggui Liu ◽  
Yang Zhang ◽  
Jing Yan ◽  
Tao Song ◽  
Yongjun Xu
Keyword(s):  
Gemini Surfactants ◽  
Drilling Fluid ◽  
Drilling Fluids ◽  
Excellent Thermal Stability ◽  
Oil Drilling ◽  
Low Viscosity ◽  
Emulsion Drops ◽  
Oil Emulsions ◽  
Building Capability ◽  
Liquid Precipitation

AbstractTraditional water-in-oil drilling fluids are limited by their shear thinning behavior. In this article, we propose the synthesis of a thermal resistant quaternary ammonium salt gemini surfactant DQGE-I. This surfactant was synthesized using monomers such as N,N-dimethyl-1,3-propanediamine, organic acids and epichlorohydrin, as well as blocking groups such as N-vinylpyrrolidone (NVP). The prepared surfactant exhibited various advantages over traditional surfactants, including excellent thermal stability, good emulsifying and wetting capability. The use of these surfactants was shown to improve the compactness of emulsifier molecules at the oil/water interface, as well as the overall emulsificaiton effect. Laboratory studies revealed that water-in-oil emulsions prepared using DQGE-I showed high emulsion breaking voltage, low liquid precipitation and small and uniformly distributed emulsion drops. Highly thixotropic water-in-oil drilling fluids based on DQGE-I showed low viscosity, high shear rate and thermal tolerance up to 260oC. Additionally, the proposed fluid was applied in 16 wells (including WS1-H2, GS3 and XS1-H8) in the Daqing Oilfield. Testing showed that DQGE-1 exhibited excellent rheological behavior and wall-building capability. The emulsion breaking voltage exceeded 1500 V, and the yield point/ plastic viscosity ratio exceeded 0.4. The use of this surfactant can help to solve problems such as high formation temperature and poor well wall stability.

scholarly journals Encapsulation and Ultrasound-Triggered Release of G-Quadruplex DNA in Multilayer Hydrogel Microcapsules

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1342 ◽  
Author(s):  
Aaron Alford ◽  
Brenna Tucker ◽  
Veronika Kozlovskaya ◽  
Jun Chen ◽  
Nirzari Gupta ◽  
...  
Keyword(s):  
Nucleic Acids ◽  
Defense Mechanisms ◽  
The Body ◽  
Stimuli Responsive ◽  
Triggered Release ◽  
Quadruplex Dna ◽  
Nucleic Acid Therapeutics ◽  
Wide Range ◽  
G Quadruplex ◽  
Hydrogel Capsules

Nucleic acid therapeutics have the potential to be the most effective disease treatment strategy due to their intrinsic precision and selectivity for coding highly specific biological processes. However, freely administered nucleic acids of any type are quickly destroyed or rendered inert by a host of defense mechanisms in the body. In this work, we address the challenge of using nucleic acids as drugs by preparing stimuli responsive poly(methacrylic acid)/poly(N-vinylpyrrolidone) (PMAA/PVPON)n multilayer hydrogel capsules loaded with ~7 kDa G-quadruplex DNA. The capsules are shown to release their DNA cargo on demand in response to both enzymatic and ultrasound (US)-triggered degradation. The unique structure adopted by the G-quadruplex is essential to its biological function and we show that the controlled release from the microcapsules preserves the basket conformation of the oligonucleotide used in our studies. We also show that the (PMAA/PVPON) multilayer hydrogel capsules can encapsulate and release ~450 kDa double stranded DNA. The encapsulation and release approaches for both oligonucleotides in multilayer hydrogel microcapsules developed here can be applied to create methodologies for new therapeutic strategies involving the controlled delivery of sensitive biomolecules. Our study provides a promising methodology for the design of effective carriers for DNA vaccines and medicines for a wide range of immunotherapies, cancer therapy and/or tissue regeneration therapies in the future.

scholarly journals Skinny emulsions take on granular matter

Soft Matter ◽  
2018 ◽  
Vol 14 (36) ◽  
pp. 7310-7323 ◽  
Author(s):  
Anaïs Giustiniani ◽  
Simon Weis ◽  
Christophe Poulard ◽  
Paul H. Kamm ◽  
Francisco García-Moreno ◽  
...  
Keyword(s):  
Hard Spheres ◽  
Granular Matter ◽  
Emulsion Drops

The packing of soft frictional and adhesive emulsion drops shows similarities to packings of frictional hard spheres, while also presenting intriguing new features.

Evaporation of emulsion drops in still air

1971 ◽  
Vol 21 (2) ◽  
pp. 973-978
Author(s):  
V. I. Blinov ◽  
V. V. Dobrynina
Keyword(s):  
Emulsion Drops

Onion-structure bionic hydrogel capsules based on chitosan for regulating doxorubicin release

2019 ◽  
Vol 209 ◽  
pp. 152-160 ◽  
Author(s):  
Wei Zhang ◽  
Xin Jin ◽  
Heng Li ◽  
Cheng-xiong Wei ◽  
Cheng-wei Wu
Keyword(s):  
Doxorubicin Release ◽  
Hydrogel Capsules

Explosive Decay of Emulsion Drops Based on Water and Oil Products under Conditions of High-Temperature Purification of Liquids

2018 ◽  
Vol 63 (11) ◽  
pp. 462-466 ◽  
Author(s):  
V. E. Nakoryakov ◽  
R. S. Volkov ◽  
G. V. Kuznetsov ◽  
P. A. Strizhak
Keyword(s):  
High Temperature ◽  
Oil Products ◽  
Emulsion Drops
Sign in / Sign up

Export Citation Format

Share Document