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16. Surface patterning of nanoparticles with polymer patches

Author

Choueiri, Rachelle M, Galati, Elizabeth, Thérien-Aubin, Héloïse, Klinkova, Anna, Larin, Egor M, Querejeta-Fernández, Ana, Han, Lili, Xin, Huolin L, Gang, Oleg, Zhulina, Ekaterina B, Rubinstein, Michael, and Kumacheva, Eugenia

Subjects
General Science & Technology
Abstract

Patterning of colloidal particles with chemically or topographically distinct surface domains (patches) has attracted intense research interest. Surface-patterned particles act as colloidal analogues of atoms and molecules, serve as model systems in studies of phase transitions in liquid systems, behave as 'colloidal surfactants' and function as templates for the synthesis of hybrid particles. The generation of micrometre- and submicrometre-sized patchy colloids is now efficient, but surface patterning of inorganic colloidal nanoparticles with dimensions of the order of tens of nanometres is uncommon. Such nanoparticles exhibit size- and shape-dependent optical, electronic and magnetic properties, and their assemblies show new collective properties. At present, nanoparticle patterning is limited to the generation of two-patch nanoparticles, and nanoparticles with surface ripples or a 'raspberry' surface morphology. Here we demonstrate nanoparticle surface patterning, which utilizes thermodynamically driven segregation of polymer ligands from a uniform polymer brush into surface-pinned micelles following a change in solvent quality. Patch formation is reversible but can be permanently preserved using a photocrosslinking step. The methodology offers the ability to control the dimensions of patches, their spatial distribution and the number of patches per nanoparticle, in agreement with a theoretical model. The versatility of the strategy is demonstrated by patterning nanoparticles with different dimensions, shapes and compositions, tethered with various types of polymers and subjected to different external stimuli. These patchy nanocolloids have potential applications in fundamental research, the self-assembly of nanomaterials, diagnostics, sensing and colloidal stabilization.

Published
2016

18. Students' Perspectives on Problem-Based Learning in a Transitional Doctorate of Physical Therapy Program

Author

Larin, Helene M., Buccieri, Kathleen M., and Wessel, Jean

Abstract

Doctor of physical therapy (DPT) graduates are expected to be competent in professional behaviors, communication, critical inquiry, clinical decision making, and evidence-based practice. The purpose of this qualitative study was to describe the experience of students enrolled in a single, problem-based learning (PBL) course within a conventional lecture based transitional DPT (tDPT) program. Students wrote weekly entries in a reflective journal. Three investigators identified significant statements in the journal entries, clustered the statements, and developed themes. Five themes were identified: 1) accessing and applying information, 2) value of giving and receiving feedback, 3) value of and commitment to the group, 4) awareness and appreciation of the PBL process, and 5) personal and professional growth. A single PBL course within a tDPT conventional curriculum was well accepted by students in this study. Students appreciated the benefits of learning in a group, and gained knowledge, skills, and attitudes consistent with characteristics desired of DPT graduates.

Published
2010

40. Can items on the TIMP aide in determining the motor performance of children with severe cerebral palsy? A pilot study.

Author

Vanderlinden, Sébastien, Dispa, Delphine, Gustin, Fanny, Arets, Clémence, Girolami, Gay L., and Larin, Hélène M.

Subjects
RELIABILITY (Personality trait), STATISTICS, RESEARCH evaluation, RESEARCH methodology evaluation, RESEARCH methodology, CHILDREN with cerebral palsy, INTER-observer reliability, PSYCHOMETRICS, DESCRIPTIVE statistics, DATA analysis, MOTOR ability, VIDEO recording, EVALUATION, CHILDREN
Abstract

Assessing the functional level of children with severe cerebral palsy (CP) requires sensitive tools. In this study, an 'assessment tool' was developed based on the Test of Infant Motor Performance (TIMP) for this population and the reliability and validity evaluated. Five physical therapists administered the 'assessment tool' to six children (3–6 years old with a diagnosis of CP, GMFCS Level V). Subtest I of the Gross Motor Function Measure (GMFM-88) was also administered. Intra- and inter-rater reliability were assessed, and the concurrent validity between the 'assessment tool' and GMFM-88 calculated. The intra-rater reliability, a comparison of the total scores on the 'assessment tool' (live test) and the videotaped rescoring of the same test one month later showed consistency among four of the five therapists (ICC =0.7545 to 0.979). The inter-rater reliability varied on some of the items but the total score on the 'assessment tool' showed good reliability (ICC2,5 0.816). Scores of children with dyskinesia were less stable. The Spearman's rank correlation coefficient was not significant. Therapists provided recommendations for item revisions. Further development of an 'assessment tool' appears justified; a larger study using a version with revised administration guidelines and items should be undertaken to re-verify the psychometrics properties of the 'assessment tool.' [ABSTRACT FROM AUTHOR]

Published
2023
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46. Can items on the TIMP aide in determining the motor performance of children with severe cerebral palsy? A pilot study.

Author

UCL - (SLuc) Service de médecine physique et de réadaptation motrice, Vanderlinden, Sébastien, Dispa, Delphine, Gustin, Fanny, Arets, Clémence, Girolami, Gay L, Larin, Hélène M, UCL - (SLuc) Service de médecine physique et de réadaptation motrice, Vanderlinden, Sébastien, Dispa, Delphine, Gustin, Fanny, Arets, Clémence, Girolami, Gay L, and Larin, Hélène M

Abstract

Assessing the functional level of children with severe cerebral palsy (CP) requires sensitive tools. In this study, an 'assessment tool' was developed based on the Test of Infant Motor Performance (TIMP) for this population and the reliability and validity evaluated. Five physical therapists administered the 'assessment tool' to six children (3-6 years old with a diagnosis of CP, GMFCS Level V). Subtest I of the Gross Motor Function Measure (GMFM-88) was also administered. Intra- and inter-rater reliability were assessed, and the concurrent validity between the 'assessment tool' and GMFM-88 calculated. The intra-rater reliability, a comparison of the total scores on the 'assessment tool' (live test) and the videotaped rescoring of the same test one month later showed consistency among four of the five therapists (ICC =0.7545 to 0.979). The inter-rater reliability varied on some of the items but the total score on the 'assessment tool' showed good reliability (ICC 0.816). Scores of children with dyskinesia were less stable. The Spearman's rank correlation coefficient was not significant. Therapists provided recommendations for item revisions. Further development of an 'assessment tool' appears justified; a larger study using a version with revised administration guidelines and items should be undertaken to re-verify the psychometrics properties of the 'assessment tool.'

Published
2022

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