scholarly journals Investigating the Role of the Catalyst within Resorcinol–Formaldehyde Gel Synthesis

Gels ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 142
Author(s):  
Elisha Martin ◽  
Martin Prostredny ◽  
Ashleigh Fletcher
Keyword(s):  
High Surface ◽  
Sol Gel ◽  
Initial Solution ◽  
Solution Ph ◽  
Gel Properties ◽  
Resorcinol Formaldehyde ◽  
Surface Areas ◽  
The Individual ◽  
The Relationship

Resorcinol–formaldehyde (RF) gels are porous materials synthesized via a sol–gel reaction and subsequently dried, producing structures with high surface areas and low densities—properties that are highly attractive for use in various applications. The RF gel reaction takes place in the presence of a catalyst, either acidic or basic in nature, the concentration of which significantly impacts final gel properties. The full extent of the catalyst’s role, however, has been subject to debate, with the general consensus within the field being that it is simply a pH-adjuster. The work presented here explores this theory, in addition to other theories postulated in the literature, through the synthesis and analysis of RF gels catalysed by mixtures of relevant compounds with varying concentrations. The relationship between catalyst concentration and initial solution pH is decoupled, and the individual roles of both the cation and the anion within the catalyst are investigated. The results presented here point towards the significance of the metal cation within the RF gel reaction, with similar structural properties observed for gels synthesized at constant Na+ concentrations, regardless of the initial solution pH. Furthermore, through the use of alternative cations and anions within catalyst compounds, the potential effects of ions on the stabilization of macromolecules in solution are explored, the results of which suggest a ‘Hofmeister-like’ series could be applicable within the catalysis of RF gel reactions.

scholarly journals A New Synthetic Route to Organic Aerogels

1990 ◽  
Vol 180 ◽  
Author(s):  
R.W. Pekala ◽  
C.T. Alviso
Keyword(s):  
High Surface ◽  
Sol Gel ◽  
Synthetic Route ◽  
Melamine Formaldehyde ◽  
Resorcinol Formaldehyde ◽  
Surface Areas ◽  
New Material ◽  
New Type ◽  
Organic Aerogel ◽  
Organic Aerogels

ABSTRACTThe aqueous, sol-gel polymerization of melamine with formaldehyde, followed by supercritical extraction, leads to the formation of a new type of organic aerogel. Synthetic conditions (e.g. reaction time, pH) affect the density, transparency, and microstructure of the resultant aerogels. Unlike previous organic aerogels based upon resorcinol-formaldehyde, the melamine-formaldehyde aerogels are both colorless and transparent. Low densities (0.1–0.8 g/cc), high surface areas (∼1000 m2/g), and optical clarity are only a few of the promising characteristics of this new material.

Adsorption of Chromium (VI) from Aqueous Solutions Using Sol-Gel Anionic Clays with Mg/ Al=7

2009 ◽  
Vol 1242 ◽  
Author(s):  
Ramos R. Esthela ◽  
Gutiérrez O. Norma ◽  
Contreras S. Cesar ◽  
Álvarez R. Javier ◽  
Fuentes R. Rosalba
Keyword(s):  
Aqueous Solutions ◽  
High Surface ◽  
Sol Gel ◽  
Toxic Heavy Metals ◽  
Solution Ph ◽  
Langmuir Adsorption ◽  
Surface Areas ◽  
Chromium Vi ◽  
Anionic Clays ◽  
Stirring Time

ABSTRACTAnionic clays has been used in the adsorption of anionic species of toxic heavy metals, such as chromium (VI), which is considered to be a dangerous pollutant, due to its deleterious effects on human health such as epithelial irritation and cancer. In this work the removal of chromium in aqueous solutions using anionic clays with Mg/Al=7 was determined. The anionic clays were synthesized by the sol-gel method at pH 10 and 11.5, and were characterized by X-ray diffraction, thermal analysis, infrared spectroscopy and N2 adsorption Brunauer-Emmett-Teller (BET). By this method, anionic clay containing brucite was obtained. The solids exhibited meso-porosity, high surface areas and thermal stability until 500°C. The data obtained from the adsorption experiments of chromium fitted to the Langmuir adsorption isotherm model and the adsorbent capacity was determined using the Langmuir adsorption equation. The maximum chromium uptake was 45 mg of Cr/g sorbent and 43 mg Cr/g sorbent for anionic clays prepared to pH 10 and 11.5, respectively. The Cr saturation point was attained after eight minutes stirring time. According to chromium adsorption values, the solution pH does not have a significant affect on the adsorption capacity of the anionic clays.

CHILD-PARENT RELATIONS AS A FACTOR IN THE FORMATION OF PROFESSIONAL PREFERENCES IN PEDAGOGICAL DYNASTIES

2020 ◽  
Vol 2 (4) ◽  
pp. 126-130
Author(s):  
N. V. SHAMANIN ◽  
Keyword(s):  
Professional Development ◽  
The Family ◽  
The Individual ◽  
Relationship Of ◽  
The Relationship ◽  
Parent Child Relationships ◽  
Professional Preferences ◽  
Parent Child

The article raises the issue of the relationship of parent-child relationships and professional preferences in pedagogical dynasties. Particular attention is paid to the role of the family in the professional development of the individual. It has been suggested that there is a relationship between parent-child relationships and professional preferences.

The International Legal Personality of the Individual

2018 ◽  
Author(s):  
Astrid Kjeldgaard-Pedersen
Keyword(s):  
International Law ◽  
Legal Rights ◽  
Legal Personality ◽  
Legal Norms ◽  
State Of Affairs ◽  
The Individual ◽  
International Legal Personality ◽  
The Relationship ◽  
Second World

This book scrutinizes the relationship between the concept of international legal personality as a theoretical construct and the position of the individual as a matter of positive international law. By testing four main theoretical conceptions of international legal personality against historical and existing international legal norms that govern individuals, the book argues that the common narrative about the development of the role of the individual in international law is flawed. Contrary to conventional wisdom, international law did not apply to States alone until the Second World War, only to transform during the second half of the twentieth century to include individuals as its subjects. Rather, the answer to the question of individual rights and obligations under international law is—and always was—solely contingent upon the interpretation of international legal norms. It follows, of course, that the entities governed by a particular norm tell us nothing about the legal system to which that norm belongs. Instead, the distinction between international and national legal norms turns exclusively on the nature of their respective sources. Against the background of these insights, the book shows how present-day international lawyers continue to allow an idea, which was never more than a scholarly invention of the nineteenth century, to influence the interpretation and application of contemporary international law. This state of affairs has significant real-world ramifications as international legal rights and obligations of individuals (and other non-State entities) are frequently applied more restrictively than interpretation without presumptions regarding ‘personality’ would merit.

The Role of Normative Information in Judgments of Others

2019 ◽  
Author(s):  
Katherine H. Rogers
Keyword(s):  
Social Desirability ◽  
Interpersonal Perception ◽  
Future Research ◽  
Average Person ◽  
The Individual ◽  
The Relationship ◽  
Source Of Information

When forming impressions of an other’s personality, people often rely on information not directly related to the individual at hand. One source of information that can influence people’s impressions of others is the personality of the average person (i.e., normative profile). This relationship between the normative profile and an impression is called normative accuracy or normativity. In this chapter, you will learn about the average personality, why it is important, the relationship to social desirability and what it means to have a normative impression, as well as correlates and moderators of normativity. More broadly, you will learn about current research and views regarding the normative profile and normative impressions as well as concrete steps for incorporating this approach into your future research on interpersonal perception.

scholarly journals Factors affecting the organizational performance of manufacturing firms

2017 ◽  
Vol 9 ◽  
pp. 184797901771262 ◽  
Author(s):  
Ahmad Adnan Al-Tit
Keyword(s):  
Organizational Performance ◽  
Measurement Instrument ◽  
Manufacturing Firms ◽  
Factors Affecting ◽  
Mediating Role ◽  
Values And Beliefs ◽  
The Individual ◽  
The Impact ◽  
The Relationship

Numerous studies have been conducted to explore the individual effects of organizational culture (OC) and supply chain management (SCM) practices on organizational performance (OP) in different settings. The aim of this study is to investigate the impact of OC and SCM on OP. The sample of the study consisted of 93 manufacturing firms in Jordan. Data were collected from employees and managers from different divisions using a reliable and valid measurement instrument. The findings confirm that both OC and SCM practices significantly predict OP. The current study is significant in reliably testing the relationship between SCM practices and OP; however, it is necessary to consider cultural assumptions, values and beliefs as the impact of OC on OP is greater than the impact of SCM practices. Based on the results, future studies should consider the moderating and mediating role of OC on the relationship between SCM practices and OP.

Co-operation as a Conditional Strategy among Peers: Influence of Social Ecology and Kin Relations

1996 ◽  
Vol 19 (1) ◽  
pp. 39-52 ◽  
Author(s):  
Peter J. LaFreniere
Keyword(s):  
Peer Relations ◽  
Research Programme ◽  
Conditional Strategy ◽  
Social Unit ◽  
Kin Relations ◽  
Sources Of Variation ◽  
The Individual ◽  
Developmental Significance ◽  
The Relationship

The goal of this study is to analyse sources of variation, residing within the individual or within the relationship, in the ability to balance co-operative and competitive behaviours in a dyadic context. The ability to balance these two tendencies can be considered fundamental to successful adaptation within a social unit because co-operation may be essential in raising offspring, competing with other groups or in generating resources, whereas egoistic behaviour may protect the individual from exploitation or otherwise enhance reproductive success. Research is reviewed on the influence of social structures and relationships on co-operation in peer groups, and the origin and developmental significance of individual differences in co-operative abilities. Finally, a research programme investigating the conjunction of kin and peer relations is described, emphasising the role of affective synchrony, behavioural contingency, and reciprocity in shaping and sustaining co-operative behaviour as a conditional strategy.

Trade Unions

2018 ◽  
Author(s):  
Richard Whiting
Keyword(s):  
Trade Unions ◽  
Political System ◽  
The State ◽  
The Political ◽  
British Politics ◽  
Modern Britain ◽  
The Individual ◽  
The Relationship ◽  
Critical Moments

In assessing the relationship between trade unions and British politics, this chapter has two focuses. First, it examines the role of trade unions as significant intermediate associations within the political system. They have been significant as the means for the development of citizenship and involvement in society, as well as a restraint upon the power of the state. Their power has also raised questions about the relationship between the role of associations and the freedom of the individual. Second, the chapter considers critical moments when the trade unions challenged the authority of governments, especially in the periods 1918–26 and 1979–85. Both of these lines of inquiry underline the importance of conservatism in the achievement of stability in modern Britain.

scholarly journals Relationship between Service Quality and Customer Delight and Customer Loyalty at the Fitness Center Business in East Java

2021 ◽  
Vol 2 (3) ◽  
pp. 117-124
Author(s):  
Ony Thoyib Hadiwijaya ◽  
Amiartuti Kusumaningtyas ◽  
Abdul Halik
Keyword(s):  
Service Quality ◽  
Customer Loyalty ◽  
Standard Equipment ◽  
Unit Of Analysis ◽  
Fitness Center ◽  
Customer Delight ◽  
The Individual ◽  
Improve Service Quality ◽  
The Relationship

This article aims to analyze the relationship between Service Quality and Customer Delight and Customer Loyalty at the Fitness Center Business in East Java. This research method This research is an explanatory research. The unit of analysis in this study is the individual. The respondents of this research are members of the Fitness Center in East Java. The population in this study were all fitness members in the East Java region who during 2019-2020 years extended their membership at least twice and were in East Java, especially the Kartosusilo Gate area which includes the cities of Gresik, Bangkalan, Mojokerto, Surabaya, Sidoarjo and Lamongan. The number of sufficient samples is 365 respondents. The results show that Service Quality has no significant effect on customer delight. This is because with standard equipment and services, members feel happy. Likewise, the characteristics of the majority of fitness center members are individuals who feel quite happy with the situation and conditions provided by the manager, thereby indicating that the Service Quality at the current Fitness Center business in East Java has not been able to encourage an increase in customer delight. The results of this study also show that Service Quality has a significant effect on Customer Loyality, thus Service Quality at the current Fitness Center business in East Java can encourage the increase in Customer Loyality. Given the large role of service quality on customer loyalty, it is recommended that companies always maintain and improve service quality at the Fitness Center business in East Java.

scholarly journals The Crisis of Japanese Identity in the 21st Century and Watsuji Tetsurō’s Ethics

Asian Studies ◽  
2015 ◽  
Vol 3 (1) ◽  
pp. 129-144 ◽  
Author(s):  
Kristýna VOJTÍŠKOVÁ
Keyword(s):  
Interpersonal Relationships ◽  
21St Century ◽  
Contemporary Problem ◽  
Japanese Society ◽  
Point Of View ◽  
Early 20Th Century ◽  
Japanese Identity ◽  
The Individual ◽  
The Relationship

 According to some thinkers, in the 21st century, the Japanese society is facing a crisis of values. The postmodern approach to the individual and society may be one of the causes of this problem. In this point of view, an inadequate grasp of the relationship between the individual and the society seems to play an important role. The problem of this relationship was elaborated by the early 20th century philosopher Watsuji Tetsurō who endeavoured to re-define the role of an individual in the society. This paper attempts to examine the contemporary problem of Japanese identity from the perspective of Watsuji’s conception of interpersonal relationships. 

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