7 research outputs found
Physical Therapy Management Of A Manual Laborer With Chronic Rotator Cuff Tendinopathy: A Case Report
Background: Tendinopathy is characterized by tendon thickening, localized pain and chronic degeneration reflective of failed healing. 38% of manual laborers who participate in daily moderate to heavy lifting will experience Rotator Cuff Tendinopathy(RCT). There is a lack of research investigating the PT management of manual laborers who have RCT, but must continue to participate in harmful activities to fulfill occupational responsibilities. Purpose: The purpose of this case report was to describe the PT management of a patient with rotator cuff tendinopathy who, due to work requirements continued to participate in activities detrimental to the health of the supraspinatus and function of the shoulder girdle.https://dune.une.edu/pt_studcrposter/1036/thumbnail.jp
Intrinsically Conductive Polymer Fibers from Thermoplastic <i>trans</i>-1,4-Polyisoprene
Herein,
we report a new strategy to prepare conductive polymer
fibers to overcome the insurmountable weakness of current conductive
polymer fibers. First, special thermoplastic polymers are processed
into polymer fibers using a conventional melt-spinning process, and
then the nonconductive polymer fibers are converted into intrinsically
conductive polymer fibers. Using this new strategy, intrinsically
conductive polymer fibers have been prepared by melt spinning low-cost
thermoplastic <i>trans</i>-1,4-polyisoprene and doping with
iodine, which can be as fine as 0.01 mm, and the resistivity can be
as low as 10<sup>–2</sup> Ω m. Moreover, it has been
found that drawing can improve the orientation of <i>trans</i>-1,4-polyisoprene crystals in the fibers and, thus, the conductivity
of the conductive polymer fibers. Therefore, conductive fibers with
excellent conductivities can be prepared by large drawing ratios before
doping. Such conductive polymer fibers with low cost could be used
in textile, clothing, packing, and other fields, which would benefit
both industry and daily life. The newly developed method also allows
one to produce conductive polymers of any shape besides fibers for
antistatic or conductive applications
Hierarchical Layered Heterogeneous Graphene-poly(<i>N</i>‑isopropylacrylamide)-clay Hydrogels with Superior Modulus, Strength, and Toughness
Biological
composites are renowned for their elaborate heterogeneous architectures
at multiple scales, which lead to a unique combination of modulus,
strength, and toughness. Inspired by biological composites, mimicking
the heterogeneous structural design principles of biological composites
is a powerful strategy to construct high-performance structural composites.
Here, we creatively transfer some heterogeneous principles of biological
composites to the structural design of nanocomposite hydrogels. Unique
heterogeneous conductive graphene-PNIPAM-clay hydrogels are prepared
through a combination of inhomogeneous water removal processes, <i>in situ</i> free-radical polymerization, and chemical reduction
of graphene oxide. The nanocomposite hydrogels exhibit hierarchical
layered heterogeneous architectures with alternate stacking of dense
laminated layers and loose porous layers. Under tensile load, the
stiff dense laminated layers serve as sacrificial layers that fracture
at a relatively low strain, while the stretchable loose porous layers
serve as energy dissipation layers by large extension afterward. Such
local inhomogeneous deformation of the two heterogeneous layers enables
the nanocomposite hydrogels to integrate superior modulus, strength,
and toughness (9.69 MPa, 0.97 MPa, and 5.60 MJ/m<sup>3</sup>, respectively).
The study might provide meaningful enlightenments for rational structural
design of future high-performance nanocomposite hydrogels
Conductive Graphene–Melamine Sponge Prepared via Microwave Irradiation
A conductive
graphene–melamine sponge (MS) prepared via microwave irradiation
is reported in this paper. Graphene oxide supported on the MS was
prereduced first at 100 °C and then further reduced in a household
microwave oven at over 1000 °C. It was surprising to find that
graphene oxide on the MS was reduced perfectly while the three-dimensional
structure of the MS was kept well after high-temperature reduction
via microwave irradiation. Slight pyrolysis of MS was also found during
5 s microwave irradiation, resulting in nitrogen generation from the
pyrolysis of the MS being doped into graphene, which could benefit
the electric conductivity of the prepared graphene–MS. The
electric conductivity of the prepared graphene–MS is about
0.12–1.0 S/m because of the high reduction degree of graphene
oxide and nitrogen doping. On the other hand, different from the pure
MS, the newly developed conductive graphene–MS possesses superhydrophobic
and superoleophilic properties. Overall, the newly developed conductive
graphene–MS contained 94.3 wt % MS and 5.7 wt % N-doped graphene
and is a cost-effective material with good elasticity, high conductivity,
superhydrophobicity, and superoleophilicity
Conductive Graphene–Melamine Sponge Prepared via Microwave Irradiation
A conductive
graphene–melamine sponge (MS) prepared via microwave irradiation
is reported in this paper. Graphene oxide supported on the MS was
prereduced first at 100 °C and then further reduced in a household
microwave oven at over 1000 °C. It was surprising to find that
graphene oxide on the MS was reduced perfectly while the three-dimensional
structure of the MS was kept well after high-temperature reduction
via microwave irradiation. Slight pyrolysis of MS was also found during
5 s microwave irradiation, resulting in nitrogen generation from the
pyrolysis of the MS being doped into graphene, which could benefit
the electric conductivity of the prepared graphene–MS. The
electric conductivity of the prepared graphene–MS is about
0.12–1.0 S/m because of the high reduction degree of graphene
oxide and nitrogen doping. On the other hand, different from the pure
MS, the newly developed conductive graphene–MS possesses superhydrophobic
and superoleophilic properties. Overall, the newly developed conductive
graphene–MS contained 94.3 wt % MS and 5.7 wt % N-doped graphene
and is a cost-effective material with good elasticity, high conductivity,
superhydrophobicity, and superoleophilicity
Bioinspired Hierarchical Alumina–Graphene Oxide–Poly(vinyl alcohol) Artificial Nacre with Optimized Strength and Toughness
Due to hierarchical organization
of micro- and nanostructures, natural nacre exhibits extraordinary
strength and toughness, and thus provides a superior model for the
design and fabrication of high-performance artificial composite materials.
Although great progress has been made in constructing layered composites
by alternately stacking hard inorganic platelets and soft polymers,
the real issue is that the excellent strength of these composites
was obtained at the sacrifice of toughness. In this work, inspired
by the layered aragonite microplatelets/chitin nanofibers–protein
structure of natural nacre, alumina microplatelets–graphene
oxide nanosheets–polyÂ(vinyl alcohol) (Al<sub>2</sub>O<sub>3</sub>/GO–PVA) artificial nacre is successfully constructed through
layer-by-layer bottom-up assembly, in which Al<sub>2</sub>O<sub>3</sub> and GO–PVA act as “bricks” and “mortar”,
respectively. The artificial nacre has hierarchical “brick-and-mortar”
structure and exhibits excellent strength (143 ± 13 MPa) and
toughness (9.2 ± 2.7 MJ/m<sup>3</sup>), which are superior to
those of natural nacre (80–135 MPa, 1.8 MJ/m<sup>3</sup>).
It was demonstrated that the multiscale hierarchical structure of
ultrathin GO nanosheets and submicrometer-thick Al<sub>2</sub>O<sub>3</sub> platelets can deal with the conflict between strength and
toughness, thus leading to the excellent mechanical properties that
cannot be obtained using only one size of platelet. We strongly believe
that the work presented here provides a creative strategy for designing
and developing new composites with excellent strength and toughness
Conductive Graphene–Melamine Sponge Prepared via Microwave Irradiation
A conductive
graphene–melamine sponge (MS) prepared via microwave irradiation
is reported in this paper. Graphene oxide supported on the MS was
prereduced first at 100 °C and then further reduced in a household
microwave oven at over 1000 °C. It was surprising to find that
graphene oxide on the MS was reduced perfectly while the three-dimensional
structure of the MS was kept well after high-temperature reduction
via microwave irradiation. Slight pyrolysis of MS was also found during
5 s microwave irradiation, resulting in nitrogen generation from the
pyrolysis of the MS being doped into graphene, which could benefit
the electric conductivity of the prepared graphene–MS. The
electric conductivity of the prepared graphene–MS is about
0.12–1.0 S/m because of the high reduction degree of graphene
oxide and nitrogen doping. On the other hand, different from the pure
MS, the newly developed conductive graphene–MS possesses superhydrophobic
and superoleophilic properties. Overall, the newly developed conductive
graphene–MS contained 94.3 wt % MS and 5.7 wt % N-doped graphene
and is a cost-effective material with good elasticity, high conductivity,
superhydrophobicity, and superoleophilicity