A simple ternary non-ionic templating system for preparation of complex hierarchically meso–mesoporous silicas with 3D-interconnected large mesopores

2014 ◽  
Vol 2 (15) ◽  
pp. 5363-5370 ◽  
Author(s):  
Wei Wang ◽  
Huan Qi ◽  
Haibo Long ◽  
Xiaoyang Wang ◽  
Hongqiang Ru
Keyword(s):  
Silica Particles ◽  
Mesoporous Silicas ◽  
System P ◽  
Large Mesopores ◽  
First Time ◽  
Mesoporous Structures

It is for the first time demonstrated that clew-like silica particles with complex hierarchically meso–mesoporous structures can be prepared via a simple TEOS/HCl(aq.)/P123 ternary non-ionic templating system.

scholarly journals Piroxicam Loading onto Mesoporous Silicas by Supercritical CO2 Impregnation

Molecules ◽  
2021 ◽  
Vol 26 (9) ◽  
pp. 2500
Author(s):  
Marta Gallo ◽  
Luca Serpella ◽  
Federica Leone ◽  
Luigi Manna ◽  
Mauro Banchero ◽  
...  
Keyword(s):  
Supercritical Co2 ◽  
Water Solubility ◽  
Solid Dispersions ◽  
Mesoporous Silicas ◽  
Incipient Wetness Impregnation ◽  
Pore Blocking ◽  
Physico Chemical ◽  
Adsorption From Solution ◽  
First Time ◽  
Loading Procedure

Piroxicam (PRX) is a commonly prescribed nonsteroidal anti-inflammatory drug. Its efficacy, however, is partially limited by its low water solubility. In recent years, different studies have tackled this problem and have suggested delivering PRX through solid dispersions. All these strategies, however, involve the use of potentially harmful solvents for the loading procedure. Since piroxicam is soluble in supercritical CO2 (scCO2), the present study aims, for the first time, to adsorb PRX onto mesoporous silica using scCO2, which is known to be a safer and greener technique compared to the organic solvent-based ones. For comparison, PRX is also loaded by adsorption from solution and incipient wetness impregnation using ethanol as solvent. Two different commercial mesoporous silicas are used (SBA-15 and Grace Syloid® XDP), which differ in porosity order and surface silanol population. Physico-chemical analyses show that the most promising results are obtained through scCO2, which yields the amorphization of PRX, whereas some crystallization occurs in the case of adsorption from solution and IWI. The highest loading of PRX by scCO2 is obtained in SBA-15 (15 wt.%), where molecule distribution appears homogeneous, with very limited pore blocking.

A novel enantioselective synthesis of 6H-dibenzopyran derivatives by combined palladium/norbornene and cinchona alkaloid catalysis

2015 ◽  
Vol 13 (8) ◽  
pp. 2260-2263 ◽  
Author(s):  
Di Xu ◽  
Li Dai ◽  
Marta Catellani ◽  
Elena Motti ◽  
Nicola Della Ca’ ◽  
...  
Keyword(s):  
Catalytic System ◽  
Enantioselective Synthesis ◽  
Cinchona Alkaloid ◽  
System P ◽  
First Time

Chiral dibenzopyran derivatives were obtained by cinchona alkaloid, as organocatalyst, in combination, for the first time, with palladium/norbornene catalytic system.

Systems theory

2017 ◽  
Author(s):  
Anastasia Marinopoulou
Keyword(s):  
Systems Theory ◽  
Multiple Realities ◽  
Traditional Epistemology ◽  
System P ◽  
History Of ◽  
Scientific Truth ◽  
Scientific System ◽  
First Time ◽  
Methodology Of Science ◽  
Scientific Purpose

In his systems’ theory, Luhmann attempts to redefine communication, and associates it with information. For Luhmann, communication is distinct from action (Handeln), and the rationality of the scientific system resides in the notion of Zweck, or in the ends of the sciences towards action. For the first time in the epistemological history of modernity, rationality is understood as a certain scientific purpose of action and not as the critique of scientific truth and validity of reason. The schism that Luhmann brought about between ‘traditional’ epistemology (reconsidered now as novel) and the ‘critical’ theory of science (seen by Luhmann as ‘traditional’) was irredeemable. In the following pages, I maintain that all evidence to the contrary such a divergence was inherent to modernity.Drawing on the Schützean model of multiple realities, Luhmann manages to blur the distinction between instrumentality and rationality by relativizing both within systemic complexity. According to Luhmann, complexity characterizes a multifaceted social system, such as science itself. However, I argue that where complexity, in Luhmann, interprets the systemic, it also employs presentism and partial situationalism to explain the essence and methodology of science as a system.

From Dalton to the Discovery of the Periodic System

2013 ◽  
Author(s):  
Eric Scerri
Keyword(s):  
Periodic System ◽  
Quantitative Data ◽  
Quantitative Characteristic ◽  
Good Deal ◽  
Ancient Greek ◽  
System P ◽  
Quantitative Property ◽  
To Come ◽  
First Time

Our story begins, somewhat arbitrarily, in the English city of Manchester around the turn of the nineteenth century. There, a child prodigy by the name of John Dalton, at the tender age of fifteen is teaching in a school with his older brother. Within a few years, John Dalton’s interests have developed to encompass meteorology, physics, and chemistry. Among the questions that puzzle him is why the various component gases in the air such as oxygen, nitrogen, and carbon dioxide do not separate from each other. Why does the mixture of gases in the air remain as a homogeneous mixture? As a result of pursuing this question, Dalton develops what is to become modern atomic theory. The ultimate constituents of all substances, he supposes, are hard microscopic spheres or atoms that were first discussed by the ancient Greek philosophers and taken up again by modern scientists like Newton, Gassendi, and Boscovich. But Dalton goes a good deal further than all of these thinkers in establishing one all-important quantitative characteristic for each kind of atom, namely its weight. This he does by considering quantitative data on chemical experiments. For example, he finds that the ratio for the weight in which hydrogen and oxygen combine together is one to eight. Dalton assumes that water consists of one atom of each of these two elements. He takes a hydrogen atom to have a weight of 1 unit and therefore reasons that oxygen must have a weight of 8 units. Similarly, he deduces the weights for a number of other atoms and even molecules as we now call them. For the first time the elements acquire a quantitative property, by means of which they may be compared. This feature will eventually lead to an accurate classification of all the elements in the form of the periodic system, but this is yet to come. Before that can happen the notion of atoms provokes tremendous debates and disagreements among the experts of Dalton’s day.

One-step synthesis of golf ball-like thiol-functionalized silica particles

Soft Matter ◽  
2020 ◽  
Vol 16 (39) ◽  
pp. 9113-9120
Author(s):  
Ruixue Liang ◽  
Xia Fang ◽  
Biwei Qiu ◽  
Hua Zou
Keyword(s):  
Sol Gel ◽  
Silica Particles ◽  
Golf Ball ◽  
Functionalized Silica ◽  
One Step ◽  
First Time

Golf ball-like thiol-functionalized silica particles were synthesized for the first time by a one-step sol–gel reaction using 3-mercaptopropyl trimethoxysilane (MPTMS) and tetraethoxysilane (TEOS) as the precursors.

Autocatalytic amplified detection of DNA based on a CdSe quantum dot/folic acid electrochemiluminescence energy transfer system

The Analyst ◽  
2015 ◽  
Vol 140 (1) ◽  
pp. 79-82 ◽  
Author(s):  
Guifen Jie ◽  
Yingqiang Qin ◽  
Qingmin Meng ◽  
Jialin Wang
Keyword(s):  
Energy Transfer ◽  
Folic Acid ◽  
Quantum Dot ◽  
Transfer System ◽  
Cdse Qds ◽  
System P ◽  
Cdse Quantum Dot ◽  
Autocatalytic System ◽  
First Time

Electrochemiluminescence energy transfer from CdSe QDs to folic acid was applied for the first time for amplified detection of DNA by a DNAzyme autocatalytic system.

Successful melting and density measurements of Cu and Ag single crystals with an electrostatic levitation (ESL) system

CrystEngComm ◽  
2014 ◽  
Vol 16 (32) ◽  
pp. 7575-7579 ◽  
Author(s):  
Yong Chan Cho ◽  
Bum-Su Kim ◽  
Hanbyeol Yoo ◽  
Ji Young Kim ◽  
Seunghun Lee ◽  
...  
Keyword(s):  
High Temperature ◽  
Single Crystal ◽  
Single Crystals ◽  
Electrostatic Levitation ◽  
Density Measurements ◽  
System P ◽  
First Time

By using grain-free single crystal specimens, the melting of Cu and Ag using electrostatic levitation (ESL) and obtaining their high-temperature densities were accomplished for the first time.

Rhodium-catalyzed intermolecular C(sp3)–H amination in a purely aqueous system

2018 ◽  
Vol 20 (1) ◽  
pp. 113-117 ◽  
Author(s):  
Xunbo Lu ◽  
Yufeng Shi ◽  
Fangrui Zhong
Keyword(s):  
Aqueous System ◽  
System P ◽  
First Time

An efficient Rh-catalyzed intermolecular C(sp3)–H amination in a purely aqueous system is developed for the first time.

Efficient mineralization of ciprofloxacin using a 3D CexZr1−xO2/RGO composite cathode

2017 ◽  
Vol 4 (2) ◽  
pp. 425-436 ◽  
Author(s):  
Yi Li ◽  
Yanan Li ◽  
Baorong Xie ◽  
Jingjing Han ◽  
Sihui Zhan ◽  
...  
Keyword(s):  
Self Assembly ◽  
Composite Cathode ◽  
Composite Electrodes ◽  
Assembly Method ◽  
System P ◽  
First Time ◽  
Fenton System

3D columnar CexZr1−xO2/RGO composite electrodes were prepared based on a hydrothermal self-assembly method and were used as cathodes to degrade ciprofloxacin (CIP) for the first time in an electro-Fenton system.

Single fluorescent probe for reversibly detecting copper ions and cysteine in a pure water system

RSC Advances ◽  
2016 ◽  
Vol 6 (37) ◽  
pp. 30951-30955 ◽  
Author(s):  
Yong Liu ◽  
Fangfang Meng ◽  
Weiying Lin
Keyword(s):  
Fluorescent Probe ◽  
Copper Ions ◽  
Pure Water ◽  
Copper Ion ◽  
Water System ◽  
System P ◽  
First Time

In this work, we have engineered a novel fluorescent probe PI, which remarkably can reversible detect copper ion and cysteine in pure water system for the first time.

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