Porous nanostructure controls kinetics, disposition and self-assembly structure of lipid digestion products

RSC Advances ◽  
2016 ◽  
Vol 6 (82) ◽  
pp. 78385-78395 ◽  
Author(s):  
Paul Joyce ◽  
Timothy J. Barnes ◽  
Ben J. Boyd ◽  
Clive A. Prestidge
Keyword(s):  
Self Assembly ◽  
Lipid Droplets ◽  
Porous Silica ◽  
Silica Particles ◽  
Structure Evolution ◽  
Lipid Digestion ◽  
H Nmr ◽  
Assembly Structure ◽  
Porous Nanostructure

Combining 1H NMR and sSAXS to discriminate the speciation and structure evolution of lipolysis products for submicron lipid droplets and lipid loaded in porous silica particles.

scholarly journals Crystalline modification of a rare earth nucleating agent for isotactic polypropylene based on its self-assembly

2018 ◽  
Vol 5 (5) ◽  
pp. 180247 ◽  
Author(s):  
Yuanming Zhang ◽  
Tingting Sun ◽  
Wei Jiang ◽  
Guangting Han
Keyword(s):  
Hydrogen Bond ◽  
Rare Earth ◽  
Isotactic Polypropylene ◽  
Self Assembly ◽  
Dendritic Structure ◽  
Nucleating Agent ◽  
The Self ◽  
Structure Evolution ◽  
Crystalline Modification ◽  
Assembly Structure

In this paper, the crystalline modification of a rare earth nucleating agent (WBG) for isotactic polypropylene (PP) based on its supramolecular self-assembly was investigated by differential scanning calorimetry, wide-angle X-ray diffraction and polarized optical microscopy. In addition, the relationship between the self-assembly structure of the nucleating agent and the crystalline structure, as well as the possible reason for the self-assembly behaviour, was further studied. The structure evolution of WBG showed that the self-assembly structure changed from a needle-like structure to a dendritic structure with increase in the content of WBG. When the content of WBG exceeded a critical value (0.4 wt%), it self-assembled into a strip structure. This revealed that the structure evolution of WBG contributed to the K β and the crystallization morphology of PP with different content of WBG. In addition, further studies implied that the behaviour of self-assembly was a liquid–solid transformation of WBG, followed by a liquid–liquid phase separation of molten isotactic PP and WBG. The formation of the self-assembly structure was based on the free molecules by hydrogen bond dissociation while being heated, followed by aggregation into another structure by hydrogen bond association while being cooled. Furthermore, self-assembly behaviour depends largely on the interaction between WBG themselves.

scholarly journals A Brief Overview of Recent Progress in Porous Silica as Catalyst Supports

2021 ◽  
Vol 5 (3) ◽  
pp. 75
Author(s):  
Preeti S. Shinde ◽  
Pradnya S. Suryawanshi ◽  
Kanchan K. Patil ◽  
Vedika M. Belekar ◽  
Sandeep A. Sankpal ◽  
...  
Keyword(s):  
Heterogeneous Catalysis ◽  
High Surface ◽  
High Surface Area ◽  
Porous Silica ◽  
Textural Properties ◽  
Silica Particles ◽  
Catalyst Supports ◽  
Silica Supports ◽  
Low Degree ◽  
Transfer Properties

Porous silica particles have shown applications in various technological fields including their use as catalyst supports in heterogeneous catalysis. The mesoporous silica particles have ordered porosity, high surface area, and good chemical stability. These interesting structural or textural properties make porous silica an attractive material for use as catalyst supports in various heterogeneous catalysis reactions. The colloidal nature of the porous silica particles is highly useful in catalytic applications as it guarantees better mass transfer properties and uniform distribution of the various metal or metal oxide nanocatalysts in solution. The catalysts show high activity, low degree of metal leaching, and ease in recycling when supported or immobilized on porous silica-based materials. In this overview, we have pointed out the importance of porous silica as catalyst supports. A variety of chemical reactions catalyzed by different catalysts loaded or embedded in porous silica supports are studied. The latest reports from the literature about the use of porous silica-based materials as catalyst supports are listed and analyzed. The new and continued trends are discussed with examples.

Cobalt oxide decorated porous silica particles: structure and activity relationship in the catalytic oxidation of carbon monoxide

2021 ◽  
pp. 152121
Author(s):  
Daniil A. Eurov ◽  
Tatiana N. Rostovshchikova ◽  
Marina I. Shilina ◽  
Demid A. Kirilenko ◽  
Maria V. Tomkovich ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Oxidation ◽  
Cobalt Oxide ◽  
Porous Silica ◽  
Silica Particles ◽  
Activity Relationship ◽  
Structure And Activity ◽  
Oxidation Of Carbon Monoxide

scholarly journals Evaporation rates of water contained within porous silica particles

1999 ◽  
Vol 1 (5) ◽  
pp. 909-911 ◽  
Author(s):  
Kate J. Beverley ◽  
John H. Clint ◽  
Paul D. I. Fletcher ◽  
Sarah Thubron
Keyword(s):  
Porous Silica ◽  
Silica Particles

scholarly journals The Research of G–Motif Construction and Chirality in Deoxyguanosine Monophosphate Nucleotide Complexes

2021 ◽  
Vol 9 ◽  
Author(s):  
Yanhong Zhu ◽  
Zhongkui Li ◽  
Pengfei Wang ◽  
Qi–Ming Qiu ◽  
Hongwei Ma ◽  
...  
Keyword(s):  
Solid State ◽  
Self Assembly ◽  
Genetic Diseases ◽  
Dna Interaction ◽  
Wave Direction ◽  
Base Pairing ◽  
X Ray Crystallography ◽  
Mismatched Dna ◽  
H Nmr ◽  
Guanine Base

A detailed understanding of the mismatched base-pairing interactions in DNA will help reveal genetic diseases and provide a theoretical basis for the development of targeted drugs. Here, we utilized mononucleotide fragment to simulate mismatch DNA interactions in a local hydrophobic microenvironment. The bipyridyl-type bridging ligands were employed as a mild stabilizer to stabilize the GG mismatch containing complexes, allowing mismatch to be visualized based on X-ray crystallography. Five single crystals of 2′-deoxyguanosine–5′–monophosphate (dGMP) metal complexes were designed and obtained via the process of self-assembly. Crystallographic studies clearly reveal the details of the supramolecular interaction between mononucleotides and guest intercalators. A novel guanine–guanine base mismatch pattern with unusual (high anti)–(high anti) type of arrangement around the glycosidic angle conformations was successfully constructed. The solution state 1H–NMR, ESI–MS spectrum studies, and UV titration experiments emphasize the robustness of this g–motif in solution. Additionally, we combined the methods of single-crystal and solution-, solid-state CD spectrum together to discuss the chirality of the complexes. The complexes containing the g–motif structure, which reduces the energy of the system, following the solid-state CD signals, generally move in the long-wave direction. These results provided a new mismatched base pairing, that is g–motif. The interaction mode and full characterizations of g–motif will contribute to the study of the mismatched DNA interaction.

scholarly journals Self-ordered cellulose nanocrystals and microscopic investigations

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
C.F. Castro-Guerrero ◽  
A.B. Morales-Cepeda ◽  
M.R. Díaz-Guillén ◽  
F. Delgado-Arroyo ◽  
F.A. López-González
Keyword(s):  
Cellulose Nanocrystals ◽  
Self Assembly ◽  
Nematic Phase ◽  
Average Length ◽  
Periodic Change ◽  
Local Orientation ◽  
Preferred Direction ◽  
Self Assembling ◽  
Chiral Nematic ◽  
Assembly Structure

Abstract Cellulose nanocrystals were extracted from cotton. The cellulose nanocrystals made a self-assembly structure when dried under slow conditions, as it was revealed by the characterization made to the material. The AFM images of the nanocrystals showed that they had a changing local orientation, pointing in a preferred direction that underwent a periodic change. This periodic change resembles the orientation of a chiral nematic phase. The TEM images showed that the nanocrystals had a rod-like appearance with average length size of 98.5 nm and a diameter of 4.7 nm. The TEM characterization showed the nanocrystals with more details than AFM. In this paper, the self-assembling of CNC was observed by AFM, and further investigations were done by TEM, deconvoluting the process of CNC nanorods aggregation.

scholarly journals Change in Surface Property and Structure of Porous Silica Particles by Hydrothermal Treatments.

1998 ◽  
Vol 35 (10) ◽  
pp. 706-712 ◽  
Author(s):  
Masayoshi FUJI ◽  
Kotoe MACHIDA ◽  
Takashi TAKEI ◽  
Tohru WATANABE ◽  
Masatoshi CHIKAZAWA
Keyword(s):  
Surface Property ◽  
Porous Silica ◽  
Silica Particles

Field emission from self-assembly structure of carbon-nanotube films

2005 ◽  
Vol 250 (1-4) ◽  
pp. 9-13 ◽  
Author(s):  
L.M. Sheng ◽  
M. Liu ◽  
P. Liu ◽  
Y. Wei ◽  
L. Liu ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Field Emission ◽  
Self Assembly ◽  
Assembly Structure ◽  
Nanotube Films
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