Multilobular morphology: the key for biphase multitask nanogels

Soft Matter ◽  
2021 ◽  
Author(s):  
Ana Sofía Sonzogni ◽  
Shaghayegh Hamzehlou ◽  
Verónica D. G. Gonzalez ◽  
Jose Ramon Leiza ◽  
Roque J Minari
Keyword(s):  
Controlled Release ◽  
Water Retention ◽  
Biological Fluids ◽  
High Water ◽  
High Loading ◽  
Leading Role

Nanogels have a leading role in controlled release systems because they offer high water retention resulting in high loading capabilities, stability in biological fluids and biocompatibility. In this scenario, every...

scholarly journals High Loading Efficiency and Controlled Release of Bioactive Immunotherapeutic Proteins Using Vaterite Nanoparticles (Part. Part. Syst. Charact. 7/2021)

2021 ◽  
Vol 38 (7) ◽  
pp. 2170013
Author(s):  
Ghizlane Choukrani ◽  
Jimena Álvarez Freile ◽  
Natasha Ustyanovska Avtenyuk ◽  
Wei Wan ◽  
Kerstin Zimmermann ◽  
...  
Keyword(s):  
Controlled Release ◽  
High Loading ◽  
Loading Efficiency

Properties and Management of Allophanic Soils

2003 ◽  
Author(s):  
Anthony S. R. Juo ◽  
Kathrin Franzluebbers
Keyword(s):  
Water Content ◽  
Bulk Density ◽  
Water Retention ◽  
Field Capacity ◽  
High Water ◽  
Soil Porosity ◽  
Water Retention Capacity ◽  
Soil Taxonomy ◽  
Retention Capacity ◽  
High Soil

Allophanic soils are dark-colored young soils derived mainly from volcanic ash. These soils typically have a low bulk density (< 0.9 Mg/m3), a high water retention capacity (100% by weight at field capacity), and contain predominantly allophanes, imogolite, halloysite, and amorphous Al silicates in the clay fraction. These soils are found in small, restricted areas with volcanic activity. Worldwide, there are about 120 million ha of allophanic soils, which is about 1% of the Earth's ice-free land surface. In tropical regions, allophanic soils are among the most productive and intensively used agricultural soils. They occur in the Philippines, Indonesia, Papua New Guinea, the Caribbean and South Pacific islands, East Africa, Central America, and the Andean rim of South America. Allophanic soils are primarily Andisols and andic Inceptisols, Entisols, Mollisols, and Alfisols according to the Soil Taxonomy classification. Allophanic soils generally have a dark-colored surface soil, slippery or greasy consistency, a predominantly crumb and granular structure, and a low bulk density ranging from 0.3 to 0.8 Mg/m3. Although allophanic soils are apparently well-drained, they still have a very high water content many days after rain. When the soil is pressed between fingers, it gives a plastic, greasy, but non-sticky sensation of a silty or loamy texture. When dry, the soil loses its greasiness and becomes friable and powdery. The low bulk density of allophanic soils is closely related to the high soil porosity. For example, moderately weathered allophanic soils typically have a total porosity of 78%, with macro-, meso-, and micropores occupying 13%, 33%, and 32%, respectively. Water retained in the mesopores is readily available for plant uptake. Water retained in the micropores is held strongly by soil particles and is not readily available for plant use. The macropores provide soil aeration and facilitate water infiltration. The high water retention capacity is also associated with the high soil porosity. In allophanic soils formed under a humid climate, especially those containing large amounts of allophane, the moisture content at field capacity can be as high as 300%, calculated on a weight basis. Such extremely high values of water content seem misleading.

scholarly journals Development of Interlocking Concrete Blocks with Added Sugarcane Residues

Fibers ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 61 ◽  
Author(s):  
Bruno Ribeiro ◽  
Tadaaki Uchiyama ◽  
Jun Tomiyama ◽  
Takashi Yamamoto ◽  
Yosuke Yamashiki
Keyword(s):  
Flexural Strength ◽  
Water Retention ◽  
Retention Rate ◽  
High Water ◽  
Urban Heat Islands ◽  
Water Evaporation ◽  
Heat Islands ◽  
Concrete Blocks ◽  
Urban Heat ◽  
Bagasse Fiber

The use of sugarcane residues in mortar and concrete is believed to contribute to a reduction of costs and environmental problems, such as the reduction of mining of natural aggregates and incorrect disposal of the sugarcane residues. Bagasse fiber has a high water retention rate and thus may be considered as a countermeasure for urban heat islands. Because of these properties, bagasse fiber and bagasse sand were added into the preparation of the interlocking concrete blocks. An investigation of the flexural strength and the contribution of the sugarcane residues against an urban heat island was made. The results showed that, by adding 2.0% of bagasse fiber and 5.0% of bagasse sand in concrete, the flexural strength and the water retention content increased in comparison to the control composite. Moreover, the surface temperature and the water evaporation rate of the blocks were smaller in comparison to the control composite.

Passive cooling effect of RC roof covered with the ceramics having high water retention and evaporation capacity

2011 ◽  
Vol 18 (22) ◽  
pp. 222026 ◽  
Author(s):  
M Yamazaki ◽  
M Kanaya ◽  
T Shimazu ◽  
T Ohashi ◽  
N Kato ◽  
...  
Keyword(s):  
Water Retention ◽  
High Water ◽  
Cooling Effect ◽  
Passive Cooling

scholarly journals Testing of experimental samples of nanofibrillar cellulose in the production of lightweight coated paper

2021 ◽  
Vol 25 (2) ◽  
pp. 90-98
Author(s):  
E.T. Tyurin ◽  
◽  
A.A. Zuikov ◽  
A.I. Bondarev ◽  
L.P. Gulyanz ◽  
...  
Keyword(s):  
High Speed ◽  
Water Retention ◽  
High Water ◽  
Water Retention Capacity ◽  
Preliminary Assessment ◽  
Coated Paper ◽  
Retention Capacity ◽  
Paper Coatings ◽  
Nanofibrillar Cellulose ◽  
Coating Composition

The influence of nanofibrillar cellulose samples on the coating compositions water retention is considered. It was shown that gels of nanofibrillar cellulose and coating compositions based on them are distinguished by a high water-retention capacity during centrifugation (50.8% and 31.0% versus 17.7% with NaCMC). A preliminary assessment of the printing and technical properties of light weight coated paper (LWC) using nanofibrillar cellulose in the coating composition has been carried out. The technical characteristics of nanofibrillar cellulose have been determined, formulations of lightweight paper coatings have been developed for high-speed modern equipment.

scholarly journals High Loading Efficiency and Controlled Release of Bioactive Immunotherapeutic Proteins Using Vaterite Nanoparticles

2021 ◽  
pp. 2100012
Author(s):  
Ghizlane Choukrani ◽  
Jimena Álvarez Freile ◽  
Natasha Ustyanovska Avtenyuk ◽  
Wei Wan ◽  
Kerstin Zimmermann ◽  
...  
Keyword(s):  
Controlled Release ◽  
High Loading ◽  
Loading Efficiency

scholarly journals Engineered polyethersulfone membrane for well-dispersed silver nanoparticle impregnation at high loading: high water permeate flux and biofouling prevention

2021 ◽  
Author(s):  
Mohana Mukherjee ◽  
Rajdip Bandyopadhyaya
Keyword(s):  
Membrane Surface ◽  
Water Flux ◽  
High Water ◽  
High Loading ◽  
Permeate Flux ◽  
Ag Nps ◽  
Pore Blockage ◽  
Mean Size ◽  
Pes Membrane ◽  
20 Nm

Abstract We present a new method for impregnation of silver nanoparticles (Ag NPs) at high loading on PES membrane's external surface, simultaneously retaining native membrane's porosity – to achieve a high water permeate flux without biofouling. This was possible by PES membrane's surface modification with acrylic acid (AA), finally leading to AA-Ag-PES membrane. AA-Ag-PES had a high (9.04%) Ag-NP loading selectively on membrane surface, as discrete, smaller (mean size: 20 nm) NPs. In nonfunctionalized Ag-PES, aggregated (mean size: 70 nm) NPs, with lower Ag loading (0.73 wt.%) was obtained, with NP being present both on membrane surface and inside pores. Consequently, AA-Ag-PES could maintain similar water permeability and porosity (10,153.05 Lm−2 h−1bar−1 and 69.98%, respectively), as in native PES (11,368.74 Lm−2 h−1bar−1 and 68.86%, respectively); whereas both parameters dropped significantly for Ag-PES (4,869.66 Lm−2 h−1bar−1 and 49.02%, respectively). AA-Ag-PES also showed least flux reduction (7.7%) due to its anti-biofouling property and high flux recovery after usage and cleaning, compared to native PES and Ag-PES membrane's much higher flux reduction (54.29% and 36.7%, respectively). Hence, discrete NP impregnation, avoiding pore blockage, is key for achieving high water flux and anti-biofouling properties (in AA-Ag-PES), compared to non-functionalized Ag-PES, due to aggregated Ag-NPs inside its pores.

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