Analysis of the physical and microbiocidal characteristics of an emerging and innovative UV disinfection technology

IntroductionSurface disinfection is one of the key points to reduce the risk of transmission both in healthcare and other public spaces. A novel UV-chip disinfection technology is presented. Technological, photonic and microbiocidal characteristics are evaluated taking as reference an ultraviolet-C (UV-C) LED source of equivalent radiant power.MethodsThe UV chip has a circular radiating surface with a diameter of 1.3 cm, emitting UV cold light at about 5 mW and driven current of about 80 µA. Four bacterial strains were used to conduct the microbiological tests at 4°C and 60°C to evaluate the bactericidal performance of the two technologies under the same operating conditions.ResultsSpectral differences were found between the UV-C LED and the chip, with an emission curve strictly around 280 nm and a broader band centred around 264 nm, respectively. Between-technology microbiological inactivation levels were comparable, achieving total abatement (99.999%) in 8 min at 7.5 cm.DiscussionThe UV chip exhibits unique properties that make it applicable in some specific contexts, where UV-C LEDs present the most critical issues. Besides, it is portable and exhibits a broad spectrum of UV wavelengths with a peak where the maximum microbiocidal efficacy occurs. Important issues to be addressed to improve this technology are the high voltage management and the too low energy efficiency.ConclusionThis cold emission technology is virtually unaffected by changes in ambient temperature and is particularly useful in short-distance applications. Recent developments in technology are moving towards a progressive increase in the chip’s radiant power.

Defining frugal innovation: a critical review

Frugal innovation (FI), which has gained traction in various sectors, is loosely defined as developing quality solutions in a resource-constrained environment that are affordable to low-income consumers. However, with its popularity, multiple and diverse definitions have emerged that often lack a theoretical foundation. This has led to a convoluted conceptualisation that hinders research and adoption in practice. Despite this plethora of perspectives and definitions, scholars do agree that there is a need for a unified definition. This critical review across the management, entrepreneurship, business and organisation studies literatures explores the multiple definitions of FI that have appeared in the last two decades and seeks to examine the commonalities and differences. One definition is supported by a theoretical underpinning, and main themes include affordability, adaptability, resource scarcity, accessibility and sustainability, however, there remains significant ambiguity around what constitutes an FI. Defining FI as a concept should not deter from focusing on its core aim and identifying an FI may be best achieved by comparing it to an incumbent alternative, rather than against an ill-defined concept. There is merit in developing a common understanding of FI to support strategies for its successful acceptance and diffusion globally.