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An increasing number of people living with dementia worldwide receive informal care from their family members. A key element of dementia care is maintaining a daily routine and familiarity, making caring an extremely rhythmic practice. To explore the rhythmic nature of informal care, we apply and advance Lefebvre's unfinished rhythmanalysis by developing an original typology of eurhythmia as a metastable equilibrium. Metastability, although appearing macroscopically stable, is a vulnerable state where a slight disturbance can result in deviation to another state (i.e., stable or unstable). Drawing upon interviews with informal caregivers, we discuss the rhythms and (dis)harmonies of caring practice, including the substantial rhythms of caring practice, the relational balance of rhythms between the caregiver and care recipient, and the various rhythmic disruptions that occur. We demonstrate how metastability provides an understanding of the ever-changing rhythms of every day and allows us to move beyond the immediacy of arrhythmic breaks and explore the subtle changes that occur in (poly)rhythms. Thus, eurhythmia as a metastable equilibrium allows us to explore the gradual and subtle development of, and changes to, dementia care and other routine practices in health geography., (Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.)

Informal carers are and will remain a vital part of dementia care. Given the nature of their caring tasks, which focus on enabling the care recipient to engage in meaningful activities, informal dementia carers are affected in their everyday mobility. Expectations manifested by society, loved ones and the carers themselves play a critical role in how carers perform their caring role and how they perceive their opportunity, or capability, to be mobile. This article uses Butler's concept of performativity to understand informal dementia carers' capability to be mobile. In the spring and summer of 2021, we combined remote graphic elicitation with telephone interviews to gather the views of 17 informal dementia carers (aged 50+) living in England. Three key themes emerged from our analysis of the data. Firstly, participants perceived that becoming a carer changed their capability to be mobile. Secondly, the caring role in relation to the capability to be mobile resulted in an emotional toll and perceived loss of autonomy. Thirdly, the performativity of the caring role created feelings of guilt, selfishness and resentment due to the impact caring had on participants' capability to be mobile. Our study enriches the literature on informal dementia carers' mobility, as we suggest that performativity is a key factor in how this population experiences their everyday mobility. The findings suggest that existing ageing-in-place policies should take a more holistic approach by better including those ageing adults who provide the most support: informal dementia carers., (Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.)

The stability of silver nanoparticles (Ag NPs) potentially released from clothing during a laundry cycle and their interactions with laundry-relevant surfactants [anionic (LAS), cationic (DTAC), and nonionic (Berol)] have been investigated. Surface interactions between Ag NPs and surfactants influence their speciation and stability. In the absence of surfactants as well as in the presence of LAS, the negatively charged Ag NPs were stable in solution for more than 1 day. At low DTAC concentrations (≤1 mM), DTAC-Ag NP interactions resulted in charge neutralization and formation of agglomerates. The surface charge of the particles became positive at higher concentrations due to a bilayer type formation of DTAC that prevents from agglomeration due to repulsive electrostatic forces between the positively charged colloids. The adsorption of Berol was enhanced when above its critical micelle concentration (cmc). This resulted in a surface charge close to zero and subsequent agglomeration. Extended DLVO theory calculations were in compliance with observed findings. The stability of the Ag NPs was shown to depend on the charge and concentration of the adsorbed surfactants. Such knowledge is important as it may influence the subsequent transport of Ag NPs through different chemical transients and thus their potential bioavailability and toxicity.

Hindered amine light stabilisers (HALS) are the most effective antioxidants currently available for polymer systems in post-production, in-service applications, yet the mechanism of their action is still not fully understood. Structural characterisation of HALS in polymer matrices, particularly the identification of structural modifications brought about by oxidative conditions, is critical to aid mechanistic understanding of the prophylactic effects of these molecules. In this work, electrospray ionisation tandem mass spectrometry (ESI-MS/MS) was applied to the analysis of a suite of commercially available 2,2,6,6-tetramethylpiperidine-based HALS. Fragmentation mechanisms for the [M + H](+) ions are proposed, which provide a rationale for the product ions observed in the MS/MS and MS(3) mass spectra of N-H, N-CH(3), N-C(O)CH(3) and N-OR containing HALS (where R is an alkyl substituent). A common product ion at m/z 123 was identified for the group of antioxidants containing N-H, N-CH(3) or N-C(O)CH(3) functionality, and this product ion was employed in precursor ion scans on a triple quadrupole mass spectrometer to identify the HALS species present in a crude extract from of a polyester-based coil coating. Using MS/MS, two degradation products were unambiguously identified. This technique provides a simple and selective approach to monitoring HALS structures within complex matrices., (2010 John Wiley & Sons, Ltd.)