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This paper aims to focus on the preparation of Kevlar fiber (KF) and alkaline hydrolyzed KF (KF-H) to improve the dispersed condition of polyaniline (PAn), as the aggregation of PAn would lead to some adsorption sites buried. And then the materials were used to enrich anionic dye Congo red (CR) from aqueous solution.

The materials (KF@PAn and KF-H@PAn) were designed by means of “diffusion-interfacial-polymerization” under mild condition as high affinity due to the structural properties of PAn, KF and KF-H. The dispersed degree of PAn on the surface of KF and KF-H was validated according to adsorption efficiency for CR.

The content of PAn introduced was not beyond 20 wt.%, while adsorption capacity for CR was significantly enhanced by 4–8 times (on the basis of kinetic data) according to the calculation only by the content of PAn due to KF and alkaline hydrolyzed KF exhibited almost no adsorption for CR, indicating dispersed situation of PAn coating was greatly enhanced and more active sites exposed, which was favorable for the adsorption process. Presence of NaCl would exhibit a more or less positive effect on CR uptake, suggesting the materials could be used for high salt environment.

The investigated means of dispersed degree of PAn on the surface of KF and KF-H are the further and future investigation.

This study will provide a method to improve the dispersed situation of PAn and a theoretical support to treat anionic dyes from aqueous solution especially for salt environment.

The results showed that the dispersed condition of PAn on the surface of KF and KF-H was greatly improved. According to the adsorption capacities for CR, it can be concluded that part of adsorption sites were buried due to the aggregation of PAn, and introduction of KF and KF-H, buried adsorption sites decreased greatly. This study will provide a method to decrease buried adsorption sites of PAn and a contribution for their convenient application in wastewater treatment especially for high salt environment.

This paper aims to evaluate the effects of banana (Musa) peel and guava (Psidium guajava) leaves extract as mordants on jute–cotton union fabrics dyed with onion skin extract as a natural dye.

The dye was extracted from the outer skin of onions by boiling in water and later concentrated. The bio-mordants were prepared by maceration using methanol and ethanol. The fabrics were pre-mordanted, simultaneously mordanted and post-mordanted with various concentrations according to the weight of the fabric. The dyed and mordanted fabrics were later subjected to measurement of color coordinates, color strength and colorfastness to the washing test. Furthermore, the dyed samples were characterized by Fourier transform infrared, and different chemical bonds were analyzed by X-ray photoelectron spectroscopy analysis.

Significant improvement was obtained in colorfastness and color strength values in various instances using banana peel and guava leaves as bio mordants. Post-mordanted with banana peel provided the best results for wash fastness. Better color strength was achieved by fabric post-mordanted with guava leave extracts.

Sustainable dyeing methods of natural dyes using banana peel and guava leaves as bio mordants were explored on jute–cotton union fabrics. Improvement in colorfastness and color strength for various instances was observed. Thus, this paper provides a promising alternative to metallic salt mordants.

This paper aims to provide a detailed review of weak interaction biosensors and several common biosensor methods for magnifying signals, as well as judiciously guide readers through selecting an appropriate detecting system and signal amplification method according to their research and application purpose.

This paper classifies the weak interactions between biomolecules, summarizes the common signal amplification methods used in biosensor design and compares the performance of different kinds of biosensors. It highlights a potential electrochemical signal amplification method: the G protein signaling cascade amplification system.

Developed biosensors which, based on various principles, have their own strengths and weaknesses have met the basic detection requirements for weak interaction between biomolecules: the selectivity, sensitivity and detection limit of biosensors have been consistently improving with the use of new signal amplification methods. However, most of the weak interaction biosensors stop at the research stage; there are only a minority realization of final commercial application.

This paper evaluates the status of research and application of weak interaction biosensors systematically. The G protein signaling cascade amplification system proposal offers a new avenue for the research and development of electrochemical biosensors.

The purpose of this paper is to investigate how focal firms in supply networks manage weak and strong ties for exploration and exploitation innovation in mature industries. In doing so, the paper extends the understanding of how focal firms manage open innovation (OI).

The empirical base is a multiple case study conducted on three companies operating in mature industries in Europe.

Findings of this study reveal, analyze and explain a diverse set of OI practices in the supply networks of mature industries in which the focal firms integrate strong and weak supply ties to enhance innovation outcomes. This study provides a fine-grained view of the benefits of the additive and interactive effects of strong and weak ties in OI. More specifically, the analysis reveals an enhancing role of strong supply ties in exploration, which previously was associated solely with weak ties. Moreover, this study sheds light on the dominant and orchestrating roles of focal firms.

The findings provide insights to enhance OI practices beyond the limited role of the weak ties of the supply network and highlight the essential role of the strong supply ties in mature industries.

While previous studies have associated exploration with weak ties, findings of this study reveal that exploration-oriented activities in mature industries also extend to strong ties. In the strong ties of mature industries, this study finds there is not only the exploitation of existing knowledge but also the reconfiguration and innovation of products.

A successful relationship between manufacturer and supplier is vital for the pursuit of mutual benefits, which can be affected by one of the partners’ opportunistic behavior, causing disequilibrium in the existing relationship. The extant research has mainly focused on opportunism as a single phenomenon rather than the detectable strong form and unnoticeable weak form of opportunistic behavior in an exchange relationship that affects the relational outcomes in various ways. This study aims to contribute toward explaining the effect of economic and social forces on a strong and a weak form of opportunism and, in turn, its impact on relational outcomes in manufacturer-supplier relationships.

A sample of 361 manufacturers was drawn randomly using a sampling frame from the western part of India. The authors used covariance-based structural equation modeling to support the proposed model empirically. The authors examined the effect of social capital and transaction cost dimensions on different forms of a supplier’s opportunism.

All three dimensions of social capital have a different impact on both the forms of a supplier’s opportunism in the relationship. The authors found that social capital moderates the relationship between transaction-specific investments on a weak form of opportunism, while social capital is more valuable in curbing opportunism due to the effect of environmental uncertainty and behavioral uncertainty. The authors found that the supplier’s weak form of opportunism than the strong form has a more amplifying effect on governance costs.

This research contributes in three different ways. First, it inquires about the direct effect of transaction cost dimensions and social capital dimensions on a supplier’s multifaceted opportunism (strong form and weak form) in the manufacturer-supplier relationship. Second, it investigates the moderating effect of social capital on the relationship between transaction cost dimensions and forms of supplier opportunism. Third, the weak form of a supplier’s opportunism affects more significantly than the strong form of opportunism on governance costs.

The purpose of this paper is to examine how the spanning of inter‐organizational weak ties and technological boundaries influences knowledge brokering.

The paper is based on original fieldwork and employs a case study research design, investigating a Danish HTSF's inter‐organizational activities.

The findings show how an inter‐organizational search that crosses technological boundaries and is based on a network structure of weak ties can imply a reduced risk of unwanted knowledge spill‐over.

By not engaging in strong tie collaborations a knowledge brokering organization can reduce the risk of unwanted knowledge spill‐over. The risks and opportunities of knowledge spill‐over furthermore rely on the nature of the technology involved and to what extent technological boundaries are crossed.

An organization that can span both technological boundaries and weak ties is in a unique knowledge brokering position. The findings indicate how the barriers of an open transfer of complex knowledge across weak ties can be partially overcome by letting an R&D department be the networking department.

Very little research has examined the organizational processes at stake when spanning organizational, technological and network boundaries.

This paper aims to examine the psychological consequences of a customer engagement initiative through referral reward programs (RRPs) in online versus offline environments.

The authors conducted a qualitative study followed by a scenario-based experimental study.

The authors show that recommenders’ concern about how they are viewed by recommendation recipients (i.e. their metaperception) mediates the effects of incentives on referral likelihood in both offline and online environments. However, metaperception has a stronger effect offline where recommenders show higher impression management concerns compared to online. Furthermore, tie-strength and communication environment moderate the effect of incentives on metaperception. When referrals are made to weak-ties, incentives decrease metaperception favorability offline more than online. For strong-ties, this effect is lower, and it is similar in offline and online environments.

The study focused on an online versus offline dyadic communication and did not consider the differences among social media. Furthermore, the authors did not consider how other forms of positive metaperception, like being seen as helpful or knowledgeable, could be increased in an online incentivized referral context. It is possible that a recommender thinks others see him as more helpful or knowledgeable online because a lot more useful information and other resources could be offered here compared to offline communications.

The authors recommend managers to design both online and offline RRPs that minimize metaperception concerns; target strong ties in any communication environment as metaperception concerns are low; and target weak ties online where metaperception concerns are muted.

This work is the first to examine how recommenders’ psychological responses differ offline and online.

If social capital is understood as the ability to access resources through social ties, it is clearly important to understand how people form social ties and what types of ties they form. Research has sought to do this, but it has seldom directly examined how organisations shape these processes and outcomes. The paper aims to discuss this issue.

In-depth, comparative case study research was conducted at two voluntary sport organisations in the UK, involving 23 in-depth interviews and participant observation over a 15-month period.

The case studies showed how key organisational practices structured, in meaningful ways, people’s opportunities for interaction and the nature of that interaction, shaping the ways in which they formed ties and exchanged resources. The organisations fostered the formation of both strong and weak ties, but also “compartmentally intimate” ties.

The research challenges individualistic, rational choice accounts of tie formation, highlighting the role of organisations as brokers. In addition, interviewees’ accounts challenge well-accepted distinctions between strong and weak ties, by demonstrating the importance of ongoing, context-specific interaction.

This research offers a rare, direct insight into the role of organisations in shaping people’s ongoing social relationships. In doing so, it problematises existing conceptualisations of social capital and social ties and highlights an alternative, organisationally embedded, process-based perspective on social capital.